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6181d95afb
gecko-dev/layout/base/nsPresShell.cpp
Masayuki Nakano 6181d95afb Bug 1256589 part.4 Move the implementation of PreventDefault() and add PreventDefaultBeforeDispatch() from dom::Event to WidgetEvent r=smaug 
mDefaultPreventedByChrome is hacky. When PresShell handles Escape key events in fullscreen mode, it prevents default of every Escape key events and dispatch it only into chrome. After that, it check mDefaultPreventedByChrome if at least one call of preventDefault() occurred in chrome. Therefore, if we shouldn't set both mDefaultPreventedByChrome and mDefaultPreventedByContent to true before dispatching an event. This the reason why we need a special method, PreventDefaultBeforeDispatch() is needed for setting only mDefaultPrevented to true.

MozReview-Commit-ID: BPSq68GnWw6

--HG--
extra : rebase_source : f2f963afeba6994cc090efedebc29c0d9334c96d
extra : source : 1012dc095cc1b7236991a7befdbfbf174dc1c1af
2016-03-22 16:26:27 +09:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=2 sw=2 et tw=78:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This Original Code has been modified by IBM Corporation.
* Modifications made by IBM described herein are
* Copyright (c) International Business Machines
* Corporation, 2000
*
* Modifications to Mozilla code or documentation
* identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 05/03/2000 IBM Corp. Observer events for reflow states
*/
/* a presentation of a document, part 2 */
#include "mozilla/Logging.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/EventStates.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/TabChild.h"
#include "mozilla/Likely.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Snprintf.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/unused.h"
#include <algorithm>
#ifdef XP_WIN
#include "winuser.h"
#endif
#include "gfxPrefs.h"
#include "gfxUserFontSet.h"
#include "nsPresShell.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "mozilla/dom/BeforeAfterKeyboardEvent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for Event::GetEventPopupControlState()
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/PointerEvent.h"
#include "nsIDocument.h"
#include "nsAnimationManager.h"
#include "nsNameSpaceManager.h" // for Pref-related rule management (bugs 22963,20760,31816)
#include "nsFrame.h"
#include "FrameLayerBuilder.h"
#include "nsViewManager.h"
#include "nsView.h"
#include "nsCRTGlue.h"
#include "prprf.h"
#include "prinrval.h"
#include "nsTArray.h"
#include "nsCOMArray.h"
#include "nsContainerFrame.h"
#include "nsISelection.h"
#include "mozilla/dom/Selection.h"
#include "nsGkAtoms.h"
#include "nsIDOMRange.h"
#include "nsIDOMDocument.h"
#include "nsIDOMNode.h"
#include "nsIDOMNodeList.h"
#include "nsIDOMElement.h"
#include "nsRange.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsReadableUtils.h"
#include "nsIPageSequenceFrame.h"
#include "nsIPermissionManager.h"
#include "nsIMozBrowserFrame.h"
#include "nsCaret.h"
#include "AccessibleCaretEventHub.h"
#include "nsIDOMHTMLDocument.h"
#include "nsFrameManager.h"
#include "nsXPCOM.h"
#include "nsILayoutHistoryState.h"
#include "nsILineIterator.h" // for ScrollContentIntoView
#include "PLDHashTable.h"
#include "mozilla/dom/BeforeAfterKeyboardEventBinding.h"
#include "mozilla/dom/Touch.h"
#include "mozilla/dom/PointerEventBinding.h"
#include "nsIObserverService.h"
#include "nsDocShell.h" // for reflow observation
#include "nsIBaseWindow.h"
#include "nsError.h"
#include "nsLayoutUtils.h"
#include "nsViewportInfo.h"
#include "nsCSSRendering.h"
// for |#ifdef DEBUG| code
#include "prenv.h"
#include "nsDisplayList.h"
#include "nsRegion.h"
#include "nsRenderingContext.h"
#include "nsAutoLayoutPhase.h"
#ifdef MOZ_REFLOW_PERF
#include "nsFontMetrics.h"
#endif
#include "PositionedEventTargeting.h"
#include "nsIReflowCallback.h"
#include "nsPIDOMWindow.h"
#include "nsFocusManager.h"
#include "nsIObjectFrame.h"
#include "nsIObjectLoadingContent.h"
#include "nsNetUtil.h"
#include "nsThreadUtils.h"
#include "nsStyleSheetService.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "nsSMILAnimationController.h"
#include "SVGContentUtils.h"
#include "nsSVGEffects.h"
#include "SVGFragmentIdentifier.h"
#include "nsArenaMemoryStats.h"
#include "nsFrameSelection.h"
#include "nsPerformance.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
// Drag & Drop, Clipboard
#include "nsIDocShellTreeItem.h"
#include "nsIURI.h"
#include "nsIScrollableFrame.h"
#include "nsITimer.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#include "mozilla/a11y/DocAccessible.h"
#ifdef DEBUG
#include "mozilla/a11y/Logging.h"
#endif
#endif
// For style data reconstruction
#include "nsStyleChangeList.h"
#include "nsCSSFrameConstructor.h"
#ifdef MOZ_XUL
#include "nsMenuFrame.h"
#include "nsTreeBodyFrame.h"
#include "nsIBoxObject.h"
#include "nsITreeBoxObject.h"
#include "nsMenuPopupFrame.h"
#include "nsITreeColumns.h"
#include "nsIDOMXULMultSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsIDOMXULMenuListElement.h"
#endif
#include "mozilla/layers/CompositorBridgeChild.h"
#include "GeckoProfiler.h"
#include "gfxPlatform.h"
#include "Layers.h"
#include "LayerTreeInvalidation.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/DocumentTimeline.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
#include "nsCanvasFrame.h"
#include "nsIImageLoadingContent.h"
#include "nsImageFrame.h"
#include "nsIScreen.h"
#include "nsIScreenManager.h"
#include "nsPlaceholderFrame.h"
#include "nsTransitionManager.h"
#include "ChildIterator.h"
#include "mozilla/RestyleManagerHandle.h"
#include "mozilla/RestyleManagerHandleInlines.h"
#include "nsIDOMHTMLElement.h"
#include "nsIDragSession.h"
#include "nsIFrameInlines.h"
#include "mozilla/gfx/2D.h"
#include "nsSubDocumentFrame.h"
#include "nsQueryObject.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/ScrollInputMethods.h"
#include "nsStyleSet.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "mozilla/StyleSheetHandle.h"
#include "mozilla/StyleSheetHandleInlines.h"
#ifdef ANDROID
#include "nsIDocShellTreeOwner.h"
#endif
#ifdef MOZ_TASK_TRACER
#include "GeckoTaskTracer.h"
using namespace mozilla::tasktracer;
#endif
#define ANCHOR_SCROLL_FLAGS \
(nsIPresShell::SCROLL_OVERFLOW_HIDDEN | nsIPresShell::SCROLL_NO_PARENT_FRAMES)
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::layout;
CapturingContentInfo nsIPresShell::gCaptureInfo =
{ false /* mAllowed */, false /* mPointerLock */, false /* mRetargetToElement */,
false /* mPreventDrag */ };
nsIContent* nsIPresShell::gKeyDownTarget;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerCaptureInfo>* nsIPresShell::gPointerCaptureList;
nsClassHashtable<nsUint32HashKey, nsIPresShell::PointerInfo>* nsIPresShell::gActivePointersIds;
// RangePaintInfo is used to paint ranges to offscreen buffers
struct RangePaintInfo {
RefPtr<nsRange> mRange;
nsDisplayListBuilder mBuilder;
nsDisplayList mList;
// offset of builder's reference frame to the root frame
nsPoint mRootOffset;
RangePaintInfo(nsRange* aRange, nsIFrame* aFrame)
: mRange(aRange), mBuilder(aFrame, nsDisplayListBuilder::PAINTING, false)
{
MOZ_COUNT_CTOR(RangePaintInfo);
}
~RangePaintInfo()
{
mList.DeleteAll();
MOZ_COUNT_DTOR(RangePaintInfo);
}
};
#undef NOISY
// ----------------------------------------------------------------------
#ifdef DEBUG
// Set the environment variable GECKO_VERIFY_REFLOW_FLAGS to one or
// more of the following flags (comma separated) for handy debug
// output.
static uint32_t gVerifyReflowFlags;
struct VerifyReflowFlags {
const char* name;
uint32_t bit;
};
static const VerifyReflowFlags gFlags[] = {
{ "verify", VERIFY_REFLOW_ON },
{ "reflow", VERIFY_REFLOW_NOISY },
{ "all", VERIFY_REFLOW_ALL },
{ "list-commands", VERIFY_REFLOW_DUMP_COMMANDS },
{ "noisy-commands", VERIFY_REFLOW_NOISY_RC },
{ "really-noisy-commands", VERIFY_REFLOW_REALLY_NOISY_RC },
{ "resize", VERIFY_REFLOW_DURING_RESIZE_REFLOW },
};
#define NUM_VERIFY_REFLOW_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void
ShowVerifyReflowFlags()
{
printf("Here are the available GECKO_VERIFY_REFLOW_FLAGS:\n");
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
printf(" %s\n", flag->name);
++flag;
}
printf("Note: GECKO_VERIFY_REFLOW_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
#endif
//========================================================================
//========================================================================
//========================================================================
#ifdef MOZ_REFLOW_PERF
class ReflowCountMgr;
static const char kGrandTotalsStr[] = "Grand Totals";
// Counting Class
class ReflowCounter {
public:
explicit ReflowCounter(ReflowCountMgr * aMgr = nullptr);
~ReflowCounter();
void ClearTotals();
void DisplayTotals(const char * aStr);
void DisplayDiffTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void Add() { mTotal++; }
void Add(uint32_t aTotal) { mTotal += aTotal; }
void CalcDiffInTotals();
void SetTotalsCache();
void SetMgr(ReflowCountMgr * aMgr) { mMgr = aMgr; }
uint32_t GetTotal() { return mTotal; }
protected:
void DisplayTotals(uint32_t aTotal, const char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, const char * aTitle);
uint32_t mTotal;
uint32_t mCacheTotal;
ReflowCountMgr * mMgr; // weak reference (don't delete)
};
// Counting Class
class IndiReflowCounter {
public:
explicit IndiReflowCounter(ReflowCountMgr * aMgr = nullptr)
: mFrame(nullptr),
mCount(0),
mMgr(aMgr),
mCounter(aMgr),
mHasBeenOutput(false)
{}
virtual ~IndiReflowCounter() {}
nsAutoString mName;
nsIFrame * mFrame; // weak reference (don't delete)
int32_t mCount;
ReflowCountMgr * mMgr; // weak reference (don't delete)
ReflowCounter mCounter;
bool mHasBeenOutput;
};
//--------------------
// Manager Class
//--------------------
class ReflowCountMgr {
public:
ReflowCountMgr();
virtual ~ReflowCountMgr();
void ClearTotals();
void ClearGrandTotals();
void DisplayTotals(const char * aStr);
void DisplayHTMLTotals(const char * aStr);
void DisplayDiffsInTotals();
void Add(const char * aName, nsIFrame * aFrame);
ReflowCounter * LookUp(const char * aName);
void PaintCount(const char *aName, nsRenderingContext* aRenderingContext,
nsPresContext *aPresContext, nsIFrame *aFrame,
const nsPoint &aOffset, uint32_t aColor);
FILE * GetOutFile() { return mFD; }
PLHashTable * GetIndiFrameHT() { return mIndiFrameCounts; }
void SetPresContext(nsPresContext * aPresContext) { mPresContext = aPresContext; } // weak reference
void SetPresShell(nsIPresShell* aPresShell) { mPresShell= aPresShell; } // weak reference
void SetDumpFrameCounts(bool aVal) { mDumpFrameCounts = aVal; }
void SetDumpFrameByFrameCounts(bool aVal) { mDumpFrameByFrameCounts = aVal; }
void SetPaintFrameCounts(bool aVal) { mPaintFrameByFrameCounts = aVal; }
bool IsPaintingFrameCounts() { return mPaintFrameByFrameCounts; }
protected:
void DisplayTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
void DisplayHTMLTotals(uint32_t aTotal, uint32_t * aDupArray, char * aTitle);
static int RemoveItems(PLHashEntry *he, int i, void *arg);
static int RemoveIndiItems(PLHashEntry *he, int i, void *arg);
void CleanUp();
// stdout Output Methods
static int DoSingleTotal(PLHashEntry *he, int i, void *arg);
static int DoSingleIndi(PLHashEntry *he, int i, void *arg);
void DoGrandTotals();
void DoIndiTotalsTree();
// HTML Output Methods
static int DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg);
void DoGrandHTMLTotals();
// Zero Out the Totals
static int DoClearTotals(PLHashEntry *he, int i, void *arg);
// Displays the Diff Totals
static int DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg);
PLHashTable * mCounts;
PLHashTable * mIndiFrameCounts;
FILE * mFD;
bool mDumpFrameCounts;
bool mDumpFrameByFrameCounts;
bool mPaintFrameByFrameCounts;
bool mCycledOnce;
// Root Frame for Individual Tracking
nsPresContext * mPresContext;
nsIPresShell* mPresShell;
// ReflowCountMgr gReflowCountMgr;
};
#endif
//========================================================================
// comment out to hide caret
#define SHOW_CARET
// The upper bound on the amount of time to spend reflowing, in
// microseconds. When this bound is exceeded and reflow commands are
// still queued up, a reflow event is posted. The idea is for reflow
// to not hog the processor beyond the time specifed in
// gMaxRCProcessingTime. This data member is initialized from the
// layout.reflow.timeslice pref.
#define NS_MAX_REFLOW_TIME 1000000
static int32_t gMaxRCProcessingTime = -1;
struct nsCallbackEventRequest
{
nsIReflowCallback* callback;
nsCallbackEventRequest* next;
};
// ----------------------------------------------------------------------------
#define ASSERT_REFLOW_SCHEDULED_STATE() \
NS_ASSERTION(mReflowScheduled == \
GetPresContext()->RefreshDriver()-> \
IsLayoutFlushObserver(this), "Unexpected state")
class nsAutoCauseReflowNotifier
{
public:
explicit nsAutoCauseReflowNotifier(PresShell* aShell)
: mShell(aShell)
{
mShell->WillCauseReflow();
}
~nsAutoCauseReflowNotifier()
{
// This check should not be needed. Currently the only place that seem
// to need it is the code that deals with bug 337586.
if (!mShell->mHaveShutDown) {
mShell->DidCauseReflow();
}
else {
nsContentUtils::RemoveScriptBlocker();
}
}
PresShell* mShell;
};
class MOZ_STACK_CLASS nsPresShellEventCB : public EventDispatchingCallback
{
public:
explicit nsPresShellEventCB(PresShell* aPresShell) : mPresShell(aPresShell) {}
virtual void HandleEvent(EventChainPostVisitor& aVisitor) override
{
if (aVisitor.mPresContext && aVisitor.mEvent->mClass != eBasicEventClass) {
if (aVisitor.mEvent->mMessage == eMouseDown ||
aVisitor.mEvent->mMessage == eMouseUp) {
// Mouse-up and mouse-down events call nsFrame::HandlePress/Release
// which call GetContentOffsetsFromPoint which requires up-to-date layout.
// Bring layout up-to-date now so that GetCurrentEventFrame() below
// will return a real frame and we don't have to worry about
// destroying it by flushing later.
mPresShell->FlushPendingNotifications(Flush_Layout);
} else if (aVisitor.mEvent->mMessage == eWheel &&
aVisitor.mEventStatus != nsEventStatus_eConsumeNoDefault) {
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (frame) {
// chrome (including addons) should be able to know if content
// handles both D3E "wheel" event and legacy mouse scroll events.
// We should dispatch legacy mouse events before dispatching the
// "wheel" event into system group.
RefPtr<EventStateManager> esm =
aVisitor.mPresContext->EventStateManager();
esm->DispatchLegacyMouseScrollEvents(frame,
aVisitor.mEvent->AsWheelEvent(),
&aVisitor.mEventStatus);
}
}
nsIFrame* frame = mPresShell->GetCurrentEventFrame();
if (!frame &&
(aVisitor.mEvent->mMessage == eMouseUp ||
aVisitor.mEvent->mMessage == eTouchEnd)) {
// Redirect BUTTON_UP and TOUCH_END events to the root frame to ensure
// that capturing is released.
frame = mPresShell->GetRootFrame();
}
if (frame) {
frame->HandleEvent(aVisitor.mPresContext,
aVisitor.mEvent->AsGUIEvent(),
&aVisitor.mEventStatus);
}
}
}
RefPtr<PresShell> mPresShell;
};
class nsBeforeFirstPaintDispatcher : public nsRunnable
{
public:
explicit nsBeforeFirstPaintDispatcher(nsIDocument* aDocument)
: mDocument(aDocument) {}
// Fires the "before-first-paint" event so that interested parties (right now, the
// mobile browser) are aware of it.
NS_IMETHOD Run() override
{
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument, "before-first-paint",
nullptr);
}
return NS_OK;
}
private:
nsCOMPtr<nsIDocument> mDocument;
};
bool PresShell::sDisableNonTestMouseEvents = false;
mozilla::LazyLogModule PresShell::gLog("PresShell");
#ifdef DEBUG
static void
VerifyStyleTree(nsPresContext* aPresContext, nsFrameManager* aFrameManager)
{
if (nsFrame::GetVerifyStyleTreeEnable()) {
if (aPresContext->RestyleManager()->IsServo()) {
NS_ERROR("stylo: cannot verify style tree with a ServoRestyleManager");
return;
}
nsIFrame* rootFrame = aFrameManager->GetRootFrame();
aPresContext->RestyleManager()->AsGecko()->DebugVerifyStyleTree(rootFrame);
}
}
#define VERIFY_STYLE_TREE ::VerifyStyleTree(mPresContext, mFrameConstructor)
#else
#define VERIFY_STYLE_TREE
#endif
static bool gVerifyReflowEnabled;
bool
nsIPresShell::GetVerifyReflowEnable()
{
#ifdef DEBUG
static bool firstTime = true;
if (firstTime) {
firstTime = false;
char* flags = PR_GetEnv("GECKO_VERIFY_REFLOW_FLAGS");
if (flags) {
bool error = false;
for (;;) {
char* comma = PL_strchr(flags, ',');
if (comma)
*comma = '\0';
bool found = false;
const VerifyReflowFlags* flag = gFlags;
const VerifyReflowFlags* limit = gFlags + NUM_VERIFY_REFLOW_FLAGS;
while (flag < limit) {
if (PL_strcasecmp(flag->name, flags) == 0) {
gVerifyReflowFlags |= flag->bit;
found = true;
break;
}
++flag;
}
if (! found)
error = true;
if (! comma)
break;
*comma = ',';
flags = comma + 1;
}
if (error)
ShowVerifyReflowFlags();
}
if (VERIFY_REFLOW_ON & gVerifyReflowFlags) {
gVerifyReflowEnabled = true;
printf("Note: verifyreflow is enabled");
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf(" (noisy)");
}
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf(" (all)");
}
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf(" (show reflow commands)");
}
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf(" (noisy reflow commands)");
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf(" (REALLY noisy reflow commands)");
}
}
printf("\n");
}
}
#endif
return gVerifyReflowEnabled;
}
void
PresShell::AddInvalidateHiddenPresShellObserver(nsRefreshDriver *aDriver)
{
if (!mHiddenInvalidationObserverRefreshDriver && !mIsDestroying && !mHaveShutDown) {
aDriver->AddPresShellToInvalidateIfHidden(this);
mHiddenInvalidationObserverRefreshDriver = aDriver;
}
}
void
nsIPresShell::InvalidatePresShellIfHidden()
{
if (!IsVisible() && mPresContext) {
mPresContext->NotifyInvalidation(0);
}
mHiddenInvalidationObserverRefreshDriver = nullptr;
}
void
nsIPresShell::CancelInvalidatePresShellIfHidden()
{
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
mHiddenInvalidationObserverRefreshDriver = nullptr;
}
}
void
nsIPresShell::SetVerifyReflowEnable(bool aEnabled)
{
gVerifyReflowEnabled = aEnabled;
}
/* virtual */ void
nsIPresShell::AddWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
AddWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::AddWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (aWeakFrame->GetFrame()) {
aWeakFrame->GetFrame()->AddStateBits(NS_FRAME_EXTERNAL_REFERENCE);
}
aWeakFrame->SetPreviousWeakFrame(mWeakFrames);
mWeakFrames = aWeakFrame;
}
/* virtual */ void
nsIPresShell::RemoveWeakFrameExternal(nsWeakFrame* aWeakFrame)
{
RemoveWeakFrameInternal(aWeakFrame);
}
void
nsIPresShell::RemoveWeakFrameInternal(nsWeakFrame* aWeakFrame)
{
if (mWeakFrames == aWeakFrame) {
mWeakFrames = aWeakFrame->GetPreviousWeakFrame();
return;
}
nsWeakFrame* nextWeak = mWeakFrames;
while (nextWeak && nextWeak->GetPreviousWeakFrame() != aWeakFrame) {
nextWeak = nextWeak->GetPreviousWeakFrame();
}
if (nextWeak) {
nextWeak->SetPreviousWeakFrame(aWeakFrame->GetPreviousWeakFrame());
}
}
already_AddRefed<nsFrameSelection>
nsIPresShell::FrameSelection()
{
RefPtr<nsFrameSelection> ret = mSelection;
return ret.forget();
}
//----------------------------------------------------------------------
static bool sSynthMouseMove = true;
static uint32_t sNextPresShellId;
static bool sPointerEventEnabled = true;
static bool sAccessibleCaretEnabled = false;
static bool sBeforeAfterKeyboardEventEnabled = false;
/* static */ bool
PresShell::AccessibleCaretEnabled()
{
static bool initialized = false;
if (!initialized) {
Preferences::AddBoolVarCache(&sAccessibleCaretEnabled, "layout.accessiblecaret.enabled");
initialized = true;
}
return sAccessibleCaretEnabled;
}
/* static */ bool
PresShell::BeforeAfterKeyboardEventEnabled()
{
static bool sInitialized = false;
if (!sInitialized) {
Preferences::AddBoolVarCache(&sBeforeAfterKeyboardEventEnabled,
"dom.beforeAfterKeyboardEvent.enabled");
sInitialized = true;
}
return sBeforeAfterKeyboardEventEnabled;
}
PresShell::PresShell()
: mMouseLocation(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)
{
#ifdef MOZ_REFLOW_PERF
mReflowCountMgr = new ReflowCountMgr();
mReflowCountMgr->SetPresContext(mPresContext);
mReflowCountMgr->SetPresShell(this);
#endif
mLoadBegin = TimeStamp::Now();
mSelectionFlags = nsISelectionDisplay::DISPLAY_TEXT | nsISelectionDisplay::DISPLAY_IMAGES;
mIsThemeSupportDisabled = false;
mIsActive = true;
mIsHidden = false;
// FIXME/bug 735029: find a better solution to this problem
#if defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_ANDROID_APZ)
// The java pan/zoom code uses this to mean approximately "request a
// reset of pan/zoom state" which doesn't necessarily correspond
// with the first paint of content.
mIsFirstPaint = false;
#else
mIsFirstPaint = true;
#endif
mPresShellId = sNextPresShellId++;
mFrozen = false;
#ifdef DEBUG
mPresArenaAllocCount = 0;
#endif
mRenderFlags = 0;
mScrollPositionClampingScrollPortSizeSet = false;
static bool addedSynthMouseMove = false;
if (!addedSynthMouseMove) {
Preferences::AddBoolVarCache(&sSynthMouseMove,
"layout.reflow.synthMouseMove", true);
addedSynthMouseMove = true;
}
static bool addedPointerEventEnabled = false;
if (!addedPointerEventEnabled) {
Preferences::AddBoolVarCache(&sPointerEventEnabled,
"dom.w3c_pointer_events.enabled", true);
addedPointerEventEnabled = true;
}
mPaintingIsFrozen = false;
mHasCSSBackgroundColor = true;
mIsLastChromeOnlyEscapeKeyConsumed = false;
mHasReceivedPaintMessage = false;
}
NS_IMPL_ISUPPORTS(PresShell, nsIPresShell, nsIDocumentObserver,
nsISelectionController,
nsISelectionDisplay, nsIObserver, nsISupportsWeakReference,
nsIMutationObserver)
PresShell::~PresShell()
{
if (!mHaveShutDown) {
NS_NOTREACHED("Someone did not call nsIPresShell::destroy");
Destroy();
}
NS_ASSERTION(mCurrentEventContentStack.Count() == 0,
"Huh, event content left on the stack in pres shell dtor!");
NS_ASSERTION(mFirstCallbackEventRequest == nullptr &&
mLastCallbackEventRequest == nullptr,
"post-reflow queues not empty. This means we're leaking");
// Verify that if painting was frozen, but we're being removed from the tree,
// that we now re-enable painting on our refresh driver, since it may need to
// be re-used by another presentation.
if (mPaintingIsFrozen) {
mPresContext->RefreshDriver()->Thaw();
}
#ifdef DEBUG
MOZ_ASSERT(mPresArenaAllocCount == 0,
"Some pres arena objects were not freed");
#endif
mStyleSet->Delete();
delete mFrameConstructor;
mCurrentEventContent = nullptr;
}
/**
* Initialize the presentation shell. Create view manager and style
* manager.
* Note this can't be merged into our constructor because caret initialization
* calls AddRef() on us.
*/
void
PresShell::Init(nsIDocument* aDocument,
nsPresContext* aPresContext,
nsViewManager* aViewManager,
StyleSetHandle aStyleSet)
{
NS_PRECONDITION(aDocument, "null ptr");
NS_PRECONDITION(aPresContext, "null ptr");
NS_PRECONDITION(aViewManager, "null ptr");
NS_PRECONDITION(!mDocument, "already initialized");
if (!aDocument || !aPresContext || !aViewManager || mDocument) {
return;
}
mDocument = aDocument;
mViewManager = aViewManager;
// Create our frame constructor.
mFrameConstructor = new nsCSSFrameConstructor(mDocument, this);
mFrameManager = mFrameConstructor;
// The document viewer owns both view manager and pres shell.
mViewManager->SetPresShell(this);
// Bind the context to the presentation shell.
mPresContext = aPresContext;
aPresContext->SetShell(this);
// Now we can initialize the style set.
aStyleSet->Init(aPresContext);
mStyleSet = aStyleSet;
// Notify our prescontext that it now has a compatibility mode. Note that
// this MUST happen after we set up our style set but before we create any
// frames.
mPresContext->CompatibilityModeChanged();
// Add the preference style sheet.
UpdatePreferenceStyles();
if (AccessibleCaretEnabled()) {
// Need to happen before nsFrameSelection has been set up.
mAccessibleCaretEventHub = new AccessibleCaretEventHub(this);
}
mSelection = new nsFrameSelection();
mSelection->Init(this, nullptr);
// Important: this has to happen after the selection has been set up
#ifdef SHOW_CARET
// make the caret
mCaret = new nsCaret();
mCaret->Init(this);
mOriginalCaret = mCaret;
//SetCaretEnabled(true); // make it show in browser windows
#endif
//set up selection to be displayed in document
// Don't enable selection for print media
nsPresContext::nsPresContextType type = aPresContext->Type();
if (type != nsPresContext::eContext_PrintPreview &&
type != nsPresContext::eContext_Print)
SetDisplaySelection(nsISelectionController::SELECTION_DISABLED);
if (gMaxRCProcessingTime == -1) {
gMaxRCProcessingTime =
Preferences::GetInt("layout.reflow.timeslice", NS_MAX_REFLOW_TIME);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->AddObserver(this, "agent-sheet-added", false);
os->AddObserver(this, "user-sheet-added", false);
os->AddObserver(this, "author-sheet-added", false);
os->AddObserver(this, "agent-sheet-removed", false);
os->AddObserver(this, "user-sheet-removed", false);
os->AddObserver(this, "author-sheet-removed", false);
#ifdef MOZ_XUL
os->AddObserver(this, "chrome-flush-skin-caches", false);
#endif
os->AddObserver(this, "memory-pressure", false);
}
}
#ifdef MOZ_REFLOW_PERF
if (mReflowCountMgr) {
bool paintFrameCounts =
Preferences::GetBool("layout.reflow.showframecounts");
bool dumpFrameCounts =
Preferences::GetBool("layout.reflow.dumpframecounts");
bool dumpFrameByFrameCounts =
Preferences::GetBool("layout.reflow.dumpframebyframecounts");
mReflowCountMgr->SetDumpFrameCounts(dumpFrameCounts);
mReflowCountMgr->SetDumpFrameByFrameCounts(dumpFrameByFrameCounts);
mReflowCountMgr->SetPaintFrameCounts(paintFrameCounts);
}
#endif
if (mDocument->HasAnimationController()) {
nsSMILAnimationController* animCtrl = mDocument->GetAnimationController();
animCtrl->NotifyRefreshDriverCreated(GetPresContext()->RefreshDriver());
}
mDocument->Timeline()->NotifyRefreshDriverCreated(GetPresContext()->
RefreshDriver());
// Get our activeness from the docShell.
QueryIsActive();
// Setup our font inflation preferences.
SetupFontInflation();
mTouchManager.Init(this, mDocument);
if (mPresContext->IsRootContentDocument()) {
mZoomConstraintsClient = new ZoomConstraintsClient();
mZoomConstraintsClient->Init(this, mDocument);
if (gfxPrefs::MetaViewportEnabled() || gfxPrefs::APZAllowZooming()) {
mMobileViewportManager = new MobileViewportManager(this, mDocument);
}
}
}
enum TextPerfLogType {
eLog_reflow,
eLog_loaddone,
eLog_totals
};
static void
LogTextPerfStats(gfxTextPerfMetrics* aTextPerf,
PresShell* aPresShell,
const gfxTextPerfMetrics::TextCounts& aCounts,
float aTime, TextPerfLogType aLogType, const char* aURL)
{
LogModule* tpLog = gfxPlatform::GetLog(eGfxLog_textperf);
// ignore XUL contexts unless at debug level
mozilla::LogLevel logLevel = LogLevel::Warning;
if (aCounts.numContentTextRuns == 0) {
logLevel = LogLevel::Debug;
}
if (!MOZ_LOG_TEST(tpLog, logLevel)) {
return;
}
char prefix[256];
switch (aLogType) {
case eLog_reflow:
snprintf_literal(prefix, "(textperf-reflow) %p time-ms: %7.0f", aPresShell, aTime);
break;
case eLog_loaddone:
snprintf_literal(prefix, "(textperf-loaddone) %p time-ms: %7.0f", aPresShell, aTime);
break;
default:
MOZ_ASSERT(aLogType == eLog_totals, "unknown textperf log type");
snprintf_literal(prefix, "(textperf-totals) %p", aPresShell);
}
double hitRatio = 0.0;
uint32_t lookups = aCounts.wordCacheHit + aCounts.wordCacheMiss;
if (lookups) {
hitRatio = double(aCounts.wordCacheHit) / double(lookups);
}
if (aLogType == eLog_loaddone) {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"[%s] "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
(aURL ? aURL : ""),
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
} else {
MOZ_LOG(tpLog, logLevel,
("%s reflow: %d chars: %d "
"content-textruns: %d chrome-textruns: %d "
"max-textrun-len: %d "
"word-cache-lookups: %d word-cache-hit-ratio: %4.3f "
"word-cache-space: %d word-cache-long: %d "
"pref-fallbacks: %d system-fallbacks: %d "
"textruns-const: %d textruns-destr: %d "
"generic-lookups: %d "
"cumulative-textruns-destr: %d\n",
prefix, aTextPerf->reflowCount, aCounts.numChars,
aCounts.numContentTextRuns, aCounts.numChromeTextRuns,
aCounts.maxTextRunLen,
lookups, hitRatio,
aCounts.wordCacheSpaceRules, aCounts.wordCacheLong,
aCounts.fallbackPrefs, aCounts.fallbackSystem,
aCounts.textrunConst, aCounts.textrunDestr,
aCounts.genericLookups,
aTextPerf->cumulative.textrunDestr));
}
}
void
PresShell::Destroy()
{
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on presshell while scripts not blocked");
// dump out cumulative text perf metrics
gfxTextPerfMetrics* tp;
if (mPresContext && (tp = mPresContext->GetTextPerfMetrics())) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, 0.0, eLog_totals, nullptr);
}
}
if (mPresContext) {
gfxUserFontSet* fs = mPresContext->GetUserFontSet();
if (fs) {
uint32_t fontCount;
uint64_t fontSize;
fs->GetLoadStatistics(fontCount, fontSize);
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, fontCount);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE,
uint32_t(fontSize/1024));
} else {
Telemetry::Accumulate(Telemetry::WEBFONT_PER_PAGE, 0);
Telemetry::Accumulate(Telemetry::WEBFONT_SIZE_PER_PAGE, 0);
}
}
#ifdef MOZ_REFLOW_PERF
DumpReflows();
if (mReflowCountMgr) {
delete mReflowCountMgr;
mReflowCountMgr = nullptr;
}
#endif
if (mHaveShutDown)
return;
if (mZoomConstraintsClient) {
mZoomConstraintsClient->Destroy();
mZoomConstraintsClient = nullptr;
}
if (mMobileViewportManager) {
mMobileViewportManager->Destroy();
mMobileViewportManager = nullptr;
}
#ifdef ACCESSIBILITY
if (mDocAccessible) {
#ifdef DEBUG
if (a11y::logging::IsEnabled(a11y::logging::eDocDestroy))
a11y::logging::DocDestroy("presshell destroyed", mDocument);
#endif
mDocAccessible->Shutdown();
mDocAccessible = nullptr;
}
#endif // ACCESSIBILITY
MaybeReleaseCapturingContent();
if (gKeyDownTarget && gKeyDownTarget->OwnerDoc() == mDocument) {
NS_RELEASE(gKeyDownTarget);
}
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
if (mPresContext) {
// We need to notify the destroying the nsPresContext to ESM for
// suppressing to use from ESM.
mPresContext->EventStateManager()->NotifyDestroyPresContext(mPresContext);
}
{
nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
if (os) {
os->RemoveObserver(this, "agent-sheet-added");
os->RemoveObserver(this, "user-sheet-added");
os->RemoveObserver(this, "author-sheet-added");
os->RemoveObserver(this, "agent-sheet-removed");
os->RemoveObserver(this, "user-sheet-removed");
os->RemoveObserver(this, "author-sheet-removed");
#ifdef MOZ_XUL
os->RemoveObserver(this, "chrome-flush-skin-caches");
#endif
os->RemoveObserver(this, "memory-pressure");
}
}
// If our paint suppression timer is still active, kill it.
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
// Same for our reflow continuation timer
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
if (mDelayedPaintTimer) {
mDelayedPaintTimer->Cancel();
mDelayedPaintTimer = nullptr;
}
mSynthMouseMoveEvent.Revoke();
mUpdateImageVisibilityEvent.Revoke();
ClearVisibleImagesList(nsIImageLoadingContent::ON_NONVISIBLE_REQUEST_DISCARD);
if (mCaret) {
mCaret->Terminate();
mCaret = nullptr;
}
if (mSelection) {
mSelection->DisconnectFromPresShell();
}
if (mAccessibleCaretEventHub) {
mAccessibleCaretEventHub->Terminate();
mAccessibleCaretEventHub = nullptr;
}
// release our pref style sheet, if we have one still
RemovePreferenceStyles();
mIsDestroying = true;
// We can't release all the event content in
// mCurrentEventContentStack here since there might be code on the
// stack that will release the event content too. Double release
// bad!
// The frames will be torn down, so remove them from the current
// event frame stack (since they'd be dangling references if we'd
// leave them in) and null out the mCurrentEventFrame pointer as
// well.
mCurrentEventFrame = nullptr;
int32_t i, count = mCurrentEventFrameStack.Length();
for (i = 0; i < count; i++) {
mCurrentEventFrameStack[i] = nullptr;
}
mFramesToDirty.Clear();
if (mViewManager) {
// Clear the view manager's weak pointer back to |this| in case it
// was leaked.
mViewManager->SetPresShell(nullptr);
mViewManager = nullptr;
}
// mFrameArena will be destroyed soon. Clear out any ArenaRefPtrs
// pointing to objects in the arena now. This is done:
//
// (a) before mFrameArena's destructor runs so that our
// mPresArenaAllocCount gets down to 0 and doesn't trip the assertion
// in ~PresShell,
// (b) before the mPresContext->SetShell(nullptr) below, so
// that when we clear the ArenaRefPtrs they'll still be able to
// get back to this PresShell to deregister themselves (e.g. note
// how nsStyleContext::Arena returns the PresShell got from its
// rule node's nsPresContext, which would return null if we'd already
// called mPresContext->SetShell(nullptr)), and
// (c) before the mStyleSet->BeginShutdown() call just below, so that
// the nsStyleContexts don't complain they're being destroyed later
// than the rule tree is.
mFrameArena.ClearArenaRefPtrs();
mStyleSet->BeginShutdown();
nsRefreshDriver* rd = GetPresContext()->RefreshDriver();
// This shell must be removed from the document before the frame
// hierarchy is torn down to avoid finding deleted frames through
// this presshell while the frames are being torn down
if (mDocument) {
NS_ASSERTION(mDocument->GetShell() == this, "Wrong shell?");
mDocument->DeleteShell();
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->NotifyRefreshDriverDestroying(rd);
}
mDocument->Timeline()->NotifyRefreshDriverDestroying(rd);
}
if (mPresContext) {
mPresContext->AnimationManager()->ClearEventQueue();
mPresContext->TransitionManager()->ClearEventQueue();
}
// Revoke any pending events. We need to do this and cancel pending reflows
// before we destroy the frame manager, since apparently frame destruction
// sometimes spins the event queue when plug-ins are involved(!).
rd->RemoveLayoutFlushObserver(this);
if (mHiddenInvalidationObserverRefreshDriver) {
mHiddenInvalidationObserverRefreshDriver->RemovePresShellToInvalidateIfHidden(this);
}
if (rd->PresContext() == GetPresContext()) {
rd->RevokeViewManagerFlush();
}
mResizeEvent.Revoke();
if (mAsyncResizeTimerIsActive) {
mAsyncResizeEventTimer->Cancel();
mAsyncResizeTimerIsActive = false;
}
CancelAllPendingReflows();
CancelPostedReflowCallbacks();
// Destroy the frame manager. This will destroy the frame hierarchy
mFrameConstructor->WillDestroyFrameTree();
// Destroy all frame properties (whose destruction was suppressed
// while destroying the frame tree, but which might contain more
// frames within the properties.
if (mPresContext) {
// Clear out the prescontext's property table -- since our frame tree is
// now dead, we shouldn't be looking up any more properties in that table.
// We want to do this before we call SetShell() on the prescontext, so
// property destructors can usefully call GetPresShell() on the
// prescontext.
mPresContext->PropertyTable()->DeleteAll();
}
NS_WARN_IF_FALSE(!mWeakFrames, "Weak frames alive after destroying FrameManager");
while (mWeakFrames) {
mWeakFrames->Clear(this);
}
// Let the style set do its cleanup.
mStyleSet->Shutdown();
if (mPresContext) {
// We hold a reference to the pres context, and it holds a weak link back
// to us. To avoid the pres context having a dangling reference, set its
// pres shell to nullptr
mPresContext->SetShell(nullptr);
// Clear the link handler (weak reference) as well
mPresContext->SetLinkHandler(nullptr);
}
mHaveShutDown = true;
mTouchManager.Destroy();
}
void
PresShell::MakeZombie()
{
mIsZombie = true;
CancelAllPendingReflows();
}
void
nsIPresShell::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled != mStyleSet->GetAuthorStyleDisabled()) {
mStyleSet->SetAuthorStyleDisabled(aStyleDisabled);
ReconstructStyleData();
nsCOMPtr<nsIObserverService> observerService =
mozilla::services::GetObserverService();
if (observerService) {
observerService->NotifyObservers(mDocument,
"author-style-disabled-changed",
nullptr);
}
}
}
bool
nsIPresShell::GetAuthorStyleDisabled() const
{
return mStyleSet->GetAuthorStyleDisabled();
}
void
PresShell::UpdatePreferenceStyles()
{
if (!mDocument) {
return;
}
// If the document doesn't have a window there's no need to notify
// its presshell about changes to preferences since the document is
// in a state where it doesn't matter any more (see
// nsDocumentViewer::Close()).
if (!mDocument->GetWindow()) {
return;
}
// Documents in chrome shells do not have any preference style rules applied.
if (nsContentUtils::IsInChromeDocshell(mDocument)) {
return;
}
// We need to pass in mPresContext so that if the nsLayoutStylesheetCache
// needs to recreate the pref style sheet, it has somewhere to get the
// pref styling information from. All pres contexts for
// IsChromeOriginImage() == false will have the same pref styling information,
// and similarly for IsChromeOriginImage() == true, so it doesn't really
// matter which pres context we pass in when it does need to be recreated.
// (See nsPresContext::GetDocumentColorPreferences for how whether we
// are a chrome origin image affects some pref styling information.)
auto cache = nsLayoutStylesheetCache::For(mStyleSet->BackendType());
StyleSheetHandle::RefPtr newPrefSheet =
mPresContext->IsChromeOriginImage() ?
cache->ChromePreferenceSheet(mPresContext) :
cache->ContentPreferenceSheet(mPresContext);
if (mPrefStyleSheet == newPrefSheet) {
return;
}
mStyleSet->BeginUpdate();
RemovePreferenceStyles();
mStyleSet->AppendStyleSheet(SheetType::User, newPrefSheet);
mPrefStyleSheet = newPrefSheet;
mStyleSet->EndUpdate();
}
void
PresShell::RemovePreferenceStyles()
{
if (mPrefStyleSheet) {
mStyleSet->RemoveStyleSheet(SheetType::User, mPrefStyleSheet);
mPrefStyleSheet = nullptr;
}
}
void
PresShell::AddUserSheet(nsISupports* aSheet)
{
if (mStyleSet->IsServo()) {
NS_ERROR("stylo: nsStyleSheetService doesn't handle ServoStyleSheets yet");
return;
}
// Make sure this does what nsDocumentViewer::CreateStyleSet does wrt
// ordering. We want this new sheet to come after all the existing stylesheet
// service sheets, but before other user sheets; see nsIStyleSheetService.idl
// for the ordering. Just remove and readd all the nsStyleSheetService
// sheets.
nsCOMPtr<nsIStyleSheetService> dummy =
do_GetService(NS_STYLESHEETSERVICE_CONTRACTID);
mStyleSet->BeginUpdate();
nsStyleSheetService* sheetService = nsStyleSheetService::gInstance;
nsTArray<StyleSheetHandle::RefPtr>& userSheets = *sheetService->UserStyleSheets();
// Iterate forwards when removing so the searches for RemoveStyleSheet are as
// short as possible.
for (StyleSheetHandle sheet : userSheets) {
mStyleSet->RemoveStyleSheet(SheetType::User, sheet);
}
// Now iterate backwards, so that the order of userSheets will be the same as
// the order of sheets from it in the style set.
for (StyleSheetHandle sheet : Reversed(userSheets)) {
mStyleSet->PrependStyleSheet(SheetType::User, sheet);
}
mStyleSet->EndUpdate();
ReconstructStyleData();
}
void
PresShell::AddAgentSheet(nsISupports* aSheet)
{
// Make sure this does what nsDocumentViewer::CreateStyleSet does
// wrt ordering.
// XXXheycam This needs to work with ServoStyleSheets too.
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: AddAgentSheet needs to support ServoStyleSheets");
return;
}
mStyleSet->AppendStyleSheet(SheetType::Agent, sheet);
ReconstructStyleData();
}
void
PresShell::AddAuthorSheet(nsISupports* aSheet)
{
// XXXheycam This needs to work with ServoStyleSheets too.
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: AddAuthorSheet needs to support ServoStyleSheets");
return;
}
// Document specific "additional" Author sheets should be stronger than the
// ones added with the StyleSheetService.
StyleSheetHandle firstAuthorSheet =
mDocument->GetFirstAdditionalAuthorSheet();
if (firstAuthorSheet) {
mStyleSet->InsertStyleSheetBefore(SheetType::Doc, sheet, firstAuthorSheet);
} else {
mStyleSet->AppendStyleSheet(SheetType::Doc, sheet);
}
ReconstructStyleData();
}
void
PresShell::RemoveSheet(SheetType aType, nsISupports* aSheet)
{
RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
if (!sheet) {
NS_ERROR("stylo: RemoveSheet needs to support ServoStyleSheets");
return;
}
mStyleSet->RemoveStyleSheet(aType, sheet);
ReconstructStyleData();
}
NS_IMETHODIMP
PresShell::SetDisplaySelection(int16_t aToggle)
{
mSelection->SetDisplaySelection(aToggle);
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetDisplaySelection(int16_t *aToggle)
{
*aToggle = mSelection->GetDisplaySelection();
return NS_OK;
}
NS_IMETHODIMP
PresShell::GetSelection(SelectionType aType, nsISelection **aSelection)
{
if (!aSelection || !mSelection)
return NS_ERROR_NULL_POINTER;
*aSelection = mSelection->GetSelection(aType);
if (!(*aSelection))
return NS_ERROR_INVALID_ARG;
NS_ADDREF(*aSelection);
return NS_OK;
}
Selection*
PresShell::GetCurrentSelection(SelectionType aType)
{
if (!mSelection)
return nullptr;
return mSelection->GetSelection(aType);
}
NS_IMETHODIMP
PresShell::ScrollSelectionIntoView(SelectionType aType, SelectionRegion aRegion,
int16_t aFlags)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->ScrollSelectionIntoView(aType, aRegion, aFlags);
}
NS_IMETHODIMP
PresShell::RepaintSelection(SelectionType aType)
{
if (!mSelection)
return NS_ERROR_NULL_POINTER;
return mSelection->RepaintSelection(aType);
}
// Make shell be a document observer
void
PresShell::BeginObservingDocument()
{
if (mDocument && !mIsDestroying) {
mDocument->AddObserver(this);
if (mIsDocumentGone) {
NS_WARNING("Adding a presshell that was disconnected from the document "
"as a document observer? Sounds wrong...");
mIsDocumentGone = false;
}
}
}
// Make shell stop being a document observer
void
PresShell::EndObservingDocument()
{
// XXXbz do we need to tell the frame constructor that the document
// is gone, perhaps? Except for printing it's NOT gone, sometimes.
mIsDocumentGone = true;
if (mDocument) {
mDocument->RemoveObserver(this);
}
}
#ifdef DEBUG_kipp
char* nsPresShell_ReflowStackPointerTop;
#endif
nsresult
PresShell::Initialize(nscoord aWidth, nscoord aHeight)
{
if (mIsDestroying) {
return NS_OK;
}
if (!mDocument) {
// Nothing to do
return NS_OK;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
NS_ASSERTION(!mDidInitialize, "Why are we being called?");
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mDidInitialize = true;
#ifdef DEBUG
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
nsAutoCString url;
uri->GetSpec(url);
printf("*** PresShell::Initialize (this=%p, url='%s')\n", (void*)this, url.get());
}
}
}
#endif
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// Get the root frame from the frame manager
// XXXbz it would be nice to move this somewhere else... like frame manager
// Init(), say. But we need to make sure our views are all set up by the
// time we do this!
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(!rootFrame, "How did that happen, exactly?");
if (!rootFrame) {
nsAutoScriptBlocker scriptBlocker;
mFrameConstructor->BeginUpdate();
rootFrame = mFrameConstructor->ConstructRootFrame();
mFrameConstructor->SetRootFrame(rootFrame);
mFrameConstructor->EndUpdate();
}
NS_ENSURE_STATE(!mHaveShutDown);
if (!rootFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsIFrame* invalidateFrame = nullptr;
for (nsIFrame* f = rootFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
if (f->GetStateBits() & NS_FRAME_NO_COMPONENT_ALPHA) {
invalidateFrame = f;
f->RemoveStateBits(NS_FRAME_NO_COMPONENT_ALPHA);
}
nsCOMPtr<nsIPresShell> shell;
if (f->GetType() == nsGkAtoms::subDocumentFrame &&
(shell = static_cast<nsSubDocumentFrame*>(f)->GetSubdocumentPresShellForPainting(0)) &&
shell->GetPresContext()->IsRootContentDocument()) {
// Root content documents build a 'force active' layer, and component alpha flattening
// can't be propagated across that so no need to invalidate above this frame.
break;
}
}
if (invalidateFrame) {
invalidateFrame->InvalidateFrameSubtree();
}
Element *root = mDocument->GetRootElement();
if (root) {
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
// Have the style sheet processor construct frame for the root
// content object down
mFrameConstructor->ContentInserted(nullptr, root, nullptr, false);
VERIFY_STYLE_TREE;
// Something in mFrameConstructor->ContentInserted may have caused
// Destroy() to get called, bug 337586.
NS_ENSURE_STATE(!mHaveShutDown);
mFrameConstructor->EndUpdate();
}
// nsAutoScriptBlocker going out of scope may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Run the XBL binding constructors for any new frames we've constructed
mDocument->BindingManager()->ProcessAttachedQueue();
// Constructors may have killed us too
NS_ENSURE_STATE(!mHaveShutDown);
// Now flush out pending restyles before we actually reflow, in
// case XBL constructors changed styles somewhere.
{
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
// And that might have run _more_ XBL constructors
NS_ENSURE_STATE(!mHaveShutDown);
}
NS_ASSERTION(rootFrame, "How did that happen?");
// Note: when the frame was created above it had the NS_FRAME_IS_DIRTY bit
// set, but XBL processing could have caused a reflow which clears it.
if (MOZ_LIKELY(rootFrame->GetStateBits() & NS_FRAME_IS_DIRTY)) {
// Unset the DIRTY bits so that FrameNeedsReflow() will work right.
rootFrame->RemoveStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN);
NS_ASSERTION(!mDirtyRoots.Contains(rootFrame),
"Why is the root in mDirtyRoots already?");
FrameNeedsReflow(rootFrame, nsIPresShell::eResize, NS_FRAME_IS_DIRTY);
NS_ASSERTION(mDirtyRoots.Contains(rootFrame),
"Should be in mDirtyRoots now");
NS_ASSERTION(mReflowScheduled, "Why no reflow scheduled?");
}
// Restore our root scroll position now if we're getting here after EndLoad
// got called, since this is our one chance to do it. Note that we need not
// have reflowed for this to work; when the scrollframe is finally reflowed
// it'll pick up the position we store in it here.
if (!mDocumentLoading) {
RestoreRootScrollPosition();
}
// For printing, we just immediately unsuppress.
if (!mPresContext->IsPaginated()) {
// Kick off a one-shot timer based off our pref value. When this timer
// fires, if painting is still locked down, then we will go ahead and
// trigger a full invalidate and allow painting to proceed normally.
mPaintingSuppressed = true;
// Don't suppress painting if the document isn't loading.
nsIDocument::ReadyState readyState = mDocument->GetReadyStateEnum();
if (readyState != nsIDocument::READYSTATE_COMPLETE) {
mPaintSuppressionTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (!mPaintSuppressionTimer) {
mPaintingSuppressed = false;
} else {
// Initialize the timer.
// Default to PAINTLOCK_EVENT_DELAY if we can't get the pref value.
int32_t delay =
Preferences::GetInt("nglayout.initialpaint.delay",
PAINTLOCK_EVENT_DELAY);
mPaintSuppressionTimer->InitWithNamedFuncCallback(
sPaintSuppressionCallback, this, delay, nsITimer::TYPE_ONE_SHOT,
"PresShell::sPaintSuppressionCallback");
}
}
// If we get here and painting is not suppressed, then we can paint anytime
// and we should fire the before-first-paint notification
if (!mPaintingSuppressed) {
ScheduleBeforeFirstPaint();
}
if (root && root->IsXULElement()) {
mozilla::Telemetry::AccumulateTimeDelta(Telemetry::XUL_INITIAL_FRAME_CONSTRUCTION,
timerStart);
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::sPaintSuppressionCallback(nsITimer *aTimer, void* aPresShell)
{
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
if (self)
self->UnsuppressPainting();
}
void
PresShell::AsyncResizeEventCallback(nsITimer* aTimer, void* aPresShell)
{
static_cast<PresShell*>(aPresShell)->FireResizeEvent();
}
nsresult
PresShell::ResizeReflow(nscoord aWidth, nscoord aHeight)
{
if (mZoomConstraintsClient) {
// If we have a ZoomConstraintsClient and the available screen area
// changed, then we might need to disable double-tap-to-zoom, so notify
// the ZCC to update itself.
mZoomConstraintsClient->ScreenSizeChanged();
}
if (mMobileViewportManager) {
// If we have a mobile viewport manager, request a reflow from it. It can
// recompute the final CSS viewport and trigger a call to
// ResizeReflowIgnoreOverride if it changed.
mMobileViewportManager->RequestReflow();
return NS_OK;
}
return ResizeReflowIgnoreOverride(aWidth, aHeight);
}
nsresult
PresShell::ResizeReflowIgnoreOverride(nscoord aWidth, nscoord aHeight)
{
NS_PRECONDITION(!mIsReflowing, "Shouldn't be in reflow here!");
NS_PRECONDITION(aWidth != NS_UNCONSTRAINEDSIZE,
"shouldn't use unconstrained widths anymore");
// If we don't have a root frame yet, that means we haven't had our initial
// reflow... If that's the case, and aWidth or aHeight is unconstrained,
// ignore them altogether.
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame && aHeight == NS_UNCONSTRAINEDSIZE) {
// We can't do the work needed for SizeToContent without a root
// frame, and we want to return before setting the visible area.
return NS_ERROR_NOT_AVAILABLE;
}
const bool isHeightChanging =
(mPresContext->GetVisibleArea().height != aHeight);
mPresContext->SetVisibleArea(nsRect(0, 0, aWidth, aHeight));
// There isn't anything useful we can do if the initial reflow hasn't happened.
if (!rootFrame) {
return NS_OK;
}
RefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
// Take this ref after viewManager so it'll make sure to go away first.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (!GetPresContext()->SuppressingResizeReflow()) {
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Make sure style is up to date
{
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
rootFrame = mFrameConstructor->GetRootFrame();
if (!mIsDestroying && rootFrame) {
// XXX Do a full invalidate at the beginning so that invalidates along
// the way don't have region accumulation issues?
if (isHeightChanging) {
// For BSize changes driven by style, RestyleManager handles this.
// For height:auto BSizes (i.e. layout-controlled), descendant
// intrinsic sizes can't depend on them. So the only other case is
// viewport-controlled BSizes which we handle here.
nsLayoutUtils::MarkIntrinsicISizesDirtyIfDependentOnBSize(rootFrame);
}
{
nsAutoCauseReflowNotifier crNotifier(this);
WillDoReflow();
// Kick off a top-down reflow
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
mDirtyRoots.RemoveElement(rootFrame);
DoReflow(rootFrame, true);
}
DidDoReflow(true);
}
}
rootFrame = mFrameConstructor->GetRootFrame();
if (aHeight == NS_UNCONSTRAINEDSIZE && rootFrame) {
mPresContext->SetVisibleArea(
nsRect(0, 0, aWidth, rootFrame->GetRect().height));
}
if (!mIsDestroying && !mResizeEvent.IsPending() &&
!mAsyncResizeTimerIsActive) {
if (mInResize) {
if (!mAsyncResizeEventTimer) {
mAsyncResizeEventTimer = do_CreateInstance("@mozilla.org/timer;1");
}
if (mAsyncResizeEventTimer) {
mAsyncResizeTimerIsActive = true;
mAsyncResizeEventTimer->InitWithFuncCallback(AsyncResizeEventCallback,
this, 15,
nsITimer::TYPE_ONE_SHOT);
}
} else {
RefPtr<nsRunnableMethod<PresShell> > resizeEvent =
NS_NewRunnableMethod(this, &PresShell::FireResizeEvent);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(resizeEvent))) {
mResizeEvent = resizeEvent;
mDocument->SetNeedStyleFlush();
}
}
}
return NS_OK; //XXX this needs to be real. MMP
}
void
PresShell::FireResizeEvent()
{
if (mAsyncResizeTimerIsActive) {
mAsyncResizeTimerIsActive = false;
mAsyncResizeEventTimer->Cancel();
}
mResizeEvent.Revoke();
if (mIsDocumentGone)
return;
//Send resize event from here.
WidgetEvent event(true, mozilla::eResize);
nsEventStatus status = nsEventStatus_eIgnore;
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
mInResize = true;
EventDispatcher::Dispatch(window, mPresContext, &event, nullptr, &status);
mInResize = false;
}
}
void
PresShell::SetIgnoreFrameDestruction(bool aIgnore)
{
if (mDocument) {
// We need to tell the ImageLoader to drop all its references to frames
// because they're about to go away and it won't get notifications of that.
mDocument->StyleImageLoader()->ClearFrames(mPresContext);
}
mIgnoreFrameDestruction = aIgnore;
}
void
PresShell::NotifyDestroyingFrame(nsIFrame* aFrame)
{
if (!mIgnoreFrameDestruction) {
mDocument->StyleImageLoader()->DropRequestsForFrame(aFrame);
mFrameConstructor->NotifyDestroyingFrame(aFrame);
for (int32_t idx = mDirtyRoots.Length(); idx; ) {
--idx;
if (mDirtyRoots[idx] == aFrame) {
mDirtyRoots.RemoveElementAt(idx);
}
}
// Remove frame properties
mPresContext->NotifyDestroyingFrame(aFrame);
if (aFrame == mCurrentEventFrame) {
mCurrentEventContent = aFrame->GetContent();
mCurrentEventFrame = nullptr;
}
#ifdef DEBUG
if (aFrame == mDrawEventTargetFrame) {
mDrawEventTargetFrame = nullptr;
}
#endif
for (unsigned int i=0; i < mCurrentEventFrameStack.Length(); i++) {
if (aFrame == mCurrentEventFrameStack.ElementAt(i)) {
//One of our stack frames was deleted. Get its content so that when we
//pop it we can still get its new frame from its content
nsIContent *currentEventContent = aFrame->GetContent();
mCurrentEventContentStack.ReplaceObjectAt(currentEventContent, i);
mCurrentEventFrameStack[i] = nullptr;
}
}
mFramesToDirty.RemoveEntry(aFrame);
} else {
// We must delete this property in situ so that its destructor removes the
// frame from FrameLayerBuilder::DisplayItemData::mFrameList -- otherwise
// the DisplayItemData destructor will use the destroyed frame when it
// tries to remove it from the (array) value of this property.
mPresContext->PropertyTable()->
Delete(aFrame, FrameLayerBuilder::LayerManagerDataProperty());
}
}
already_AddRefed<nsCaret> PresShell::GetCaret() const
{
RefPtr<nsCaret> caret = mCaret;
return caret.forget();
}
already_AddRefed<AccessibleCaretEventHub> PresShell::GetAccessibleCaretEventHub() const
{
RefPtr<AccessibleCaretEventHub> eventHub = mAccessibleCaretEventHub;
return eventHub.forget();
}
void PresShell::SetCaret(nsCaret *aNewCaret)
{
mCaret = aNewCaret;
}
void PresShell::RestoreCaret()
{
mCaret = mOriginalCaret;
}
NS_IMETHODIMP PresShell::SetCaretEnabled(bool aInEnable)
{
bool oldEnabled = mCaretEnabled;
mCaretEnabled = aInEnable;
if (mCaretEnabled != oldEnabled)
{
MOZ_ASSERT(mCaret);
if (mCaret) {
mCaret->SetVisible(mCaretEnabled);
}
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretReadOnly(bool aReadOnly)
{
if (mCaret)
mCaret->SetCaretReadOnly(aReadOnly);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretEnabled(bool *aOutEnabled)
{
NS_ENSURE_ARG_POINTER(aOutEnabled);
*aOutEnabled = mCaretEnabled;
return NS_OK;
}
NS_IMETHODIMP PresShell::SetCaretVisibilityDuringSelection(bool aVisibility)
{
if (mCaret)
mCaret->SetVisibilityDuringSelection(aVisibility);
return NS_OK;
}
NS_IMETHODIMP PresShell::GetCaretVisible(bool *aOutIsVisible)
{
*aOutIsVisible = false;
if (mCaret) {
*aOutIsVisible = mCaret->IsVisible();
}
return NS_OK;
}
NS_IMETHODIMP PresShell::SetSelectionFlags(int16_t aInEnable)
{
mSelectionFlags = aInEnable;
return NS_OK;
}
NS_IMETHODIMP PresShell::GetSelectionFlags(int16_t *aOutEnable)
{
if (!aOutEnable)
return NS_ERROR_INVALID_ARG;
*aOutEnable = mSelectionFlags;
return NS_OK;
}
//implementation of nsISelectionController
NS_IMETHODIMP
PresShell::PhysicalMove(int16_t aDirection, int16_t aAmount, bool aExtend)
{
return mSelection->PhysicalMove(aDirection, aAmount, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterMove(bool aForward, bool aExtend)
{
return mSelection->CharacterMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::CharacterExtendForDelete()
{
return mSelection->CharacterExtendForDelete();
}
NS_IMETHODIMP
PresShell::CharacterExtendForBackspace()
{
return mSelection->CharacterExtendForBackspace();
}
NS_IMETHODIMP
PresShell::WordMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->WordMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward, aExtend);
return result;
}
NS_IMETHODIMP
PresShell::WordExtendForDelete(bool aForward)
{
return mSelection->WordExtendForDelete(aForward);
}
NS_IMETHODIMP
PresShell::LineMove(bool aForward, bool aExtend)
{
nsresult result = mSelection->LineMove(aForward, aExtend);
// if we can't go down/up any more we must then move caret completely to
// end/beginning respectively.
if (NS_FAILED(result))
result = CompleteMove(aForward,aExtend);
return result;
}
NS_IMETHODIMP
PresShell::IntraLineMove(bool aForward, bool aExtend)
{
return mSelection->IntraLineMove(aForward, aExtend);
}
NS_IMETHODIMP
PresShell::PageMove(bool aForward, bool aExtend)
{
nsIScrollableFrame *scrollableFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (!scrollableFrame)
return NS_OK;
mSelection->CommonPageMove(aForward, aExtend, scrollableFrame);
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
NS_IMETHODIMP
PresShell::ScrollPage(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollPage);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::PAGES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollLine(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollLine);
int32_t lineCount = Preferences::GetInt("toolkit.scrollbox.verticalScrollDistance",
NS_DEFAULT_VERTICAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? lineCount : -lineCount),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::ScrollCharacter(bool aRight)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eHorizontal);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadScrollCharacter);
int32_t h = Preferences::GetInt("toolkit.scrollbox.horizontalScrollDistance",
NS_DEFAULT_HORIZONTAL_SCROLL_DISTANCE);
scrollFrame->ScrollBy(nsIntPoint(aRight ? h : -h, 0),
nsIScrollableFrame::LINES,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteScroll(bool aForward)
{
nsIScrollableFrame* scrollFrame =
GetFrameToScrollAsScrollable(nsIPresShell::eVertical);
if (scrollFrame) {
mozilla::Telemetry::Accumulate(mozilla::Telemetry::SCROLL_INPUT_METHODS,
(uint32_t) ScrollInputMethod::MainThreadCompleteScroll);
scrollFrame->ScrollBy(nsIntPoint(0, aForward ? 1 : -1),
nsIScrollableFrame::WHOLE,
nsIScrollableFrame::SMOOTH,
nullptr, nullptr,
nsIScrollableFrame::NOT_MOMENTUM,
nsIScrollableFrame::ENABLE_SNAP);
}
return NS_OK;
}
NS_IMETHODIMP
PresShell::CompleteMove(bool aForward, bool aExtend)
{
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
nsIContent* limiter = mSelection->GetAncestorLimiter();
nsIFrame* frame = limiter ? limiter->GetPrimaryFrame()
: FrameConstructor()->GetRootElementFrame();
if (!frame)
return NS_ERROR_FAILURE;
nsIFrame::CaretPosition pos =
frame->GetExtremeCaretPosition(!aForward);
mSelection->HandleClick(pos.mResultContent, pos.mContentOffset,
pos.mContentOffset, aExtend, false,
aForward ? CARET_ASSOCIATE_AFTER : CARET_ASSOCIATE_BEFORE);
if (limiter) {
// HandleClick resets ancestorLimiter, so set it again.
mSelection->SetAncestorLimiter(limiter);
}
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
return ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS |
nsISelectionController::SCROLL_FOR_CARET_MOVE);
}
NS_IMETHODIMP
PresShell::SelectAll()
{
return mSelection->SelectAll();
}
static void
DoCheckVisibility(nsPresContext* aPresContext,
nsIContent* aNode,
int16_t aStartOffset,
int16_t aEndOffset,
bool* aRetval)
{
nsIFrame* frame = aNode->GetPrimaryFrame();
if (!frame) {
// No frame to look at so it must not be visible.
return;
}
// Start process now to go through all frames to find startOffset. Then check
// chars after that to see if anything until EndOffset is visible.
bool finished = false;
frame->CheckVisibility(aPresContext, aStartOffset, aEndOffset, true,
&finished, aRetval);
// Don't worry about other return value.
}
NS_IMETHODIMP
PresShell::CheckVisibility(nsIDOMNode *node, int16_t startOffset, int16_t EndOffset, bool *_retval)
{
if (!node || startOffset>EndOffset || !_retval || startOffset<0 || EndOffset<0)
return NS_ERROR_INVALID_ARG;
*_retval = false; //initialize return parameter
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (!content)
return NS_ERROR_FAILURE;
DoCheckVisibility(mPresContext, content, startOffset, EndOffset, _retval);
return NS_OK;
}
nsresult
PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
int16_t aEndOffset, bool* aRetval)
{
if (!aNode || aStartOffset > aEndOffset || !aRetval ||
aStartOffset < 0 || aEndOffset < 0) {
return NS_ERROR_INVALID_ARG;
}
*aRetval = false;
DoCheckVisibility(mPresContext, aNode, aStartOffset, aEndOffset, aRetval);
return NS_OK;
}
//end implementations nsISelectionController
nsIFrame*
nsIPresShell::GetRootFrameExternal() const
{
return mFrameConstructor->GetRootFrame();
}
nsIFrame*
nsIPresShell::GetRootScrollFrame() const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// Ensure root frame is a viewport frame
if (!rootFrame || nsGkAtoms::viewportFrame != rootFrame->GetType())
return nullptr;
nsIFrame* theFrame = rootFrame->PrincipalChildList().FirstChild();
if (!theFrame || nsGkAtoms::scrollFrame != theFrame->GetType())
return nullptr;
return theFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollable() const
{
nsIFrame* frame = GetRootScrollFrame();
if (!frame)
return nullptr;
nsIScrollableFrame* scrollableFrame = do_QueryFrame(frame);
NS_ASSERTION(scrollableFrame,
"All scroll frames must implement nsIScrollableFrame");
return scrollableFrame;
}
nsIScrollableFrame*
nsIPresShell::GetRootScrollFrameAsScrollableExternal() const
{
return GetRootScrollFrameAsScrollable();
}
nsIPageSequenceFrame*
PresShell::GetPageSequenceFrame() const
{
nsIFrame* frame = mFrameConstructor->GetPageSequenceFrame();
return do_QueryFrame(frame);
}
nsCanvasFrame*
PresShell::GetCanvasFrame() const
{
nsIFrame* frame = mFrameConstructor->GetDocElementContainingBlock();
return do_QueryFrame(frame);
}
void
PresShell::BeginUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
mUpdateCount++;
#endif
mFrameConstructor->BeginUpdate();
if (aUpdateType & UPDATE_STYLE)
mStyleSet->BeginUpdate();
}
void
PresShell::EndUpdate(nsIDocument *aDocument, nsUpdateType aUpdateType)
{
#ifdef DEBUG
NS_PRECONDITION(0 != mUpdateCount, "too many EndUpdate's");
--mUpdateCount;
#endif
if (aUpdateType & UPDATE_STYLE) {
mStyleSet->EndUpdate();
if (mStylesHaveChanged || !mChangedScopeStyleRoots.IsEmpty())
ReconstructStyleData();
}
mFrameConstructor->EndUpdate();
}
void
PresShell::RestoreRootScrollPosition()
{
nsIScrollableFrame* scrollableFrame = GetRootScrollFrameAsScrollable();
if (scrollableFrame) {
scrollableFrame->ScrollToRestoredPosition();
}
}
void
PresShell::MaybeReleaseCapturingContent()
{
RefPtr<nsFrameSelection> frameSelection = FrameSelection();
if (frameSelection) {
frameSelection->SetDragState(false);
}
if (gCaptureInfo.mContent &&
gCaptureInfo.mContent->OwnerDoc() == mDocument) {
SetCapturingContent(nullptr, 0);
}
}
void
PresShell::BeginLoad(nsIDocument *aDocument)
{
mDocumentLoading = true;
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
mLoadBegin = TimeStamp::Now();
}
if (shouldLog) {
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load begin [%s]\n",
this, spec.get()));
}
}
void
PresShell::EndLoad(nsIDocument *aDocument)
{
NS_PRECONDITION(aDocument == mDocument, "Wrong document");
RestoreRootScrollPosition();
mDocumentLoading = false;
}
void
PresShell::LoadComplete()
{
gfxTextPerfMetrics *tp = nullptr;
if (mPresContext) {
tp = mPresContext->GetTextPerfMetrics();
}
// log load
bool shouldLog = MOZ_LOG_TEST(gLog, LogLevel::Debug);
if (shouldLog || tp) {
TimeDuration loadTime = TimeStamp::Now() - mLoadBegin;
nsIURI* uri = mDocument->GetDocumentURI();
nsAutoCString spec;
if (uri) {
uri->GetSpec(spec);
}
if (shouldLog) {
MOZ_LOG(gLog, LogLevel::Debug,
("(presshell) %p load done time-ms: %9.2f [%s]\n",
this, loadTime.ToMilliseconds(), spec.get()));
}
if (tp) {
tp->Accumulate();
if (tp->cumulative.numChars > 0) {
LogTextPerfStats(tp, this, tp->cumulative, loadTime.ToMilliseconds(),
eLog_loaddone, spec.get());
}
}
}
}
#ifdef DEBUG
void
PresShell::VerifyHasDirtyRootAncestor(nsIFrame* aFrame)
{
// XXXbz due to bug 372769, can't actually assert anything here...
return;
// XXXbz shouldn't need this part; remove it once FrameNeedsReflow
// handles the root frame correctly.
if (!aFrame->GetParent()) {
return;
}
// Make sure that there is a reflow root ancestor of |aFrame| that's
// in mDirtyRoots already.
while (aFrame && (aFrame->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (((aFrame->GetStateBits() & NS_FRAME_REFLOW_ROOT) ||
!aFrame->GetParent()) &&
mDirtyRoots.Contains(aFrame)) {
return;
}
aFrame = aFrame->GetParent();
}
NS_NOTREACHED("Frame has dirty bits set but isn't scheduled to be "
"reflowed?");
}
#endif
void
PresShell::FrameNeedsReflow(nsIFrame *aFrame, IntrinsicDirty aIntrinsicDirty,
nsFrameState aBitToAdd,
ReflowRootHandling aRootHandling)
{
NS_PRECONDITION(aBitToAdd == NS_FRAME_IS_DIRTY ||
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN ||
!aBitToAdd,
"Unexpected bits being added");
NS_PRECONDITION(!(aIntrinsicDirty == eStyleChange &&
aBitToAdd == NS_FRAME_HAS_DIRTY_CHILDREN),
"bits don't correspond to style change reason");
NS_ASSERTION(!mIsReflowing, "can't mark frame dirty during reflow");
// If we've not yet done the initial reflow, then don't bother
// enqueuing a reflow command yet.
if (! mDidInitialize)
return;
// If we're already destroying, don't bother with this either.
if (mIsDestroying)
return;
#ifdef DEBUG
//printf("gShellCounter: %d\n", gShellCounter++);
if (mInVerifyReflow)
return;
if (VERIFY_REFLOW_NOISY_RC & gVerifyReflowFlags) {
printf("\nPresShell@%p: frame %p needs reflow\n", (void*)this, (void*)aFrame);
if (VERIFY_REFLOW_REALLY_NOISY_RC & gVerifyReflowFlags) {
printf("Current content model:\n");
Element *rootElement = mDocument->GetRootElement();
if (rootElement) {
rootElement->List(stdout, 0);
}
}
}
#endif
AutoTArray<nsIFrame*, 4> subtrees;
subtrees.AppendElement(aFrame);
do {
nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
subtrees.RemoveElementAt(subtrees.Length() - 1);
// Grab |wasDirty| now so we can go ahead and update the bits on
// subtreeRoot.
bool wasDirty = NS_SUBTREE_DIRTY(subtreeRoot);
subtreeRoot->AddStateBits(aBitToAdd);
// Determine whether we need to keep looking for the next ancestor
// reflow root if subtreeRoot itself is a reflow root.
bool targetNeedsReflowFromParent;
switch (aRootHandling) {
case ePositionOrSizeChange:
targetNeedsReflowFromParent = true;
break;
case eNoPositionOrSizeChange:
targetNeedsReflowFromParent = false;
break;
case eInferFromBitToAdd:
targetNeedsReflowFromParent = (aBitToAdd == NS_FRAME_IS_DIRTY);
break;
}
#define FRAME_IS_REFLOW_ROOT(_f) \
((_f->GetStateBits() & NS_FRAME_REFLOW_ROOT) && \
(_f != subtreeRoot || !targetNeedsReflowFromParent))
// Mark the intrinsic widths as dirty on the frame, all of its ancestors,
// and all of its descendants, if needed:
if (aIntrinsicDirty != nsIPresShell::eResize) {
// Mark argument and all ancestors dirty. (Unless we hit a reflow
// root that should contain the reflow. That root could be
// subtreeRoot itself if it's not dirty, or it could be some
// ancestor of subtreeRoot.)
for (nsIFrame *a = subtreeRoot;
a && !FRAME_IS_REFLOW_ROOT(a);
a = a->GetParent())
a->MarkIntrinsicISizesDirty();
}
if (aIntrinsicDirty == eStyleChange) {
// Mark all descendants dirty (using an nsTArray stack rather than
// recursion).
// Note that nsHTMLReflowState::InitResizeFlags has some similar
// code; see comments there for how and why it differs.
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(subtreeRoot);
do {
nsIFrame *f = stack.ElementAt(stack.Length() - 1);
stack.RemoveElementAt(stack.Length() - 1);
if (f->GetType() == nsGkAtoms::placeholderFrame) {
nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
// We have another distinct subtree we need to mark.
subtrees.AppendElement(oof);
}
}
nsIFrame::ChildListIterator lists(f);
for (; !lists.IsDone(); lists.Next()) {
for (nsIFrame* kid : lists.CurrentList()) {
kid->MarkIntrinsicISizesDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
// Skip setting dirty bits up the tree if we weren't given a bit to add.
if (!aBitToAdd) {
continue;
}
// Set NS_FRAME_HAS_DIRTY_CHILDREN bits (via nsIFrame::ChildIsDirty)
// up the tree until we reach either a frame that's already dirty or
// a reflow root.
nsIFrame *f = subtreeRoot;
for (;;) {
if (FRAME_IS_REFLOW_ROOT(f) || !f->GetParent()) {
// we've hit a reflow root or the root frame
if (!wasDirty) {
mDirtyRoots.AppendElement(f);
mDocument->SetNeedLayoutFlush();
}
#ifdef DEBUG
else {
VerifyHasDirtyRootAncestor(f);
}
#endif
break;
}
nsIFrame *child = f;
f = f->GetParent();
wasDirty = NS_SUBTREE_DIRTY(f);
f->ChildIsDirty(child);
NS_ASSERTION(f->GetStateBits() & NS_FRAME_HAS_DIRTY_CHILDREN,
"ChildIsDirty didn't do its job");
if (wasDirty) {
// This frame was already marked dirty.
#ifdef DEBUG
VerifyHasDirtyRootAncestor(f);
#endif
break;
}
}
} while (subtrees.Length() != 0);
MaybeScheduleReflow();
}
void
PresShell::FrameNeedsToContinueReflow(nsIFrame *aFrame)
{
NS_ASSERTION(mIsReflowing, "Must be in reflow when marking path dirty.");
NS_PRECONDITION(mCurrentReflowRoot, "Must have a current reflow root here");
NS_ASSERTION(aFrame == mCurrentReflowRoot ||
nsLayoutUtils::IsProperAncestorFrame(mCurrentReflowRoot, aFrame),
"Frame passed in is not the descendant of mCurrentReflowRoot");
NS_ASSERTION(aFrame->GetStateBits() & NS_FRAME_IN_REFLOW,
"Frame passed in not in reflow?");
mFramesToDirty.PutEntry(aFrame);
}
nsIScrollableFrame*
nsIPresShell::GetFrameToScrollAsScrollable(
nsIPresShell::ScrollDirection aDirection)
{
nsIScrollableFrame* scrollFrame = nullptr;
nsCOMPtr<nsIContent> focusedContent;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && mDocument) {
nsCOMPtr<nsIDOMElement> focusedElement;
fm->GetFocusedElementForWindow(mDocument->GetWindow(), false, nullptr,
getter_AddRefs(focusedElement));
focusedContent = do_QueryInterface(focusedElement);
}
if (!focusedContent && mSelection) {
nsISelection* domSelection = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (domSelection) {
nsCOMPtr<nsIDOMNode> focusedNode;
domSelection->GetFocusNode(getter_AddRefs(focusedNode));
focusedContent = do_QueryInterface(focusedNode);
}
}
if (focusedContent) {
nsIFrame* startFrame = focusedContent->GetPrimaryFrame();
if (startFrame) {
scrollFrame = startFrame->GetScrollTargetFrame();
if (scrollFrame) {
startFrame = scrollFrame->GetScrolledFrame();
}
if (aDirection == nsIPresShell::eEither) {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(startFrame);
} else {
scrollFrame =
nsLayoutUtils::GetNearestScrollableFrameForDirection(startFrame,
aDirection == eVertical ? nsLayoutUtils::eVertical :
nsLayoutUtils::eHorizontal);
}
}
}
if (!scrollFrame) {
scrollFrame = GetRootScrollFrameAsScrollable();
}
return scrollFrame;
}
void
PresShell::CancelAllPendingReflows()
{
mDirtyRoots.Clear();
if (mReflowScheduled) {
GetPresContext()->RefreshDriver()->RemoveLayoutFlushObserver(this);
mReflowScheduled = false;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void
PresShell::DestroyFramesFor(nsIContent* aContent,
nsIContent** aDestroyedFramesFor)
{
MOZ_ASSERT(aContent);
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
return;
}
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame destruction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
fc->BeginUpdate();
fc->DestroyFramesFor(aContent, aDestroyedFramesFor);
fc->EndUpdate();
--mChangeNestCount;
}
void
PresShell::CreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE_VOID(mPresContext);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return;
}
// Don't call RecreateFramesForContent since that is not exported and we want
// to keep the number of entrypoints down.
NS_ASSERTION(mViewManager, "Should have view manager");
MOZ_ASSERT(aContent);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
nsCSSFrameConstructor* fc = FrameConstructor();
nsILayoutHistoryState* layoutState = fc->GetLastCapturedLayoutHistoryState();
fc->BeginUpdate();
fc->ContentInserted(aContent->GetParent(), aContent, layoutState, false);
fc->EndUpdate();
--mChangeNestCount;
}
nsresult
PresShell::RecreateFramesFor(nsIContent* aContent)
{
NS_ENSURE_TRUE(mPresContext, NS_ERROR_FAILURE);
if (!mDidInitialize) {
// Nothing to do here. In fact, if we proceed and aContent is the
// root we will crash.
return NS_OK;
}
// Don't call RecreateFramesForContent since that is not exported and we want
// to keep the number of entrypoints down.
NS_ASSERTION(mViewManager, "Should have view manager");
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoScriptBlocker scriptBlocker;
nsStyleChangeList changeList;
changeList.AppendChange(nullptr, aContent, nsChangeHint_ReconstructFrame);
// Mark ourselves as not safe to flush while we're doing frame construction.
++mChangeNestCount;
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (restyleManager->IsServo()) {
MOZ_CRASH("stylo: PresShell::RecreateFramesFor not implemented for Servo-"
"backed style system");
}
nsresult rv = restyleManager->AsGecko()->ProcessRestyledFrames(changeList);
restyleManager->AsGecko()->FlushOverflowChangedTracker();
--mChangeNestCount;
return rv;
}
void
nsIPresShell::PostRecreateFramesFor(Element* aElement)
{
mPresContext->RestyleManager()->PostRestyleEvent(aElement, nsRestyleHint(0),
nsChangeHint_ReconstructFrame);
}
void
nsIPresShell::RestyleForAnimation(Element* aElement, nsRestyleHint aHint)
{
// Now that we no longer have separate non-animation and animation
// restyles, this method having a distinct identity is less important,
// but it still seems useful to offer as a "more public" API and as a
// chokepoint for these restyles to go through.
mPresContext->RestyleManager()->PostRestyleEvent(aElement, aHint,
NS_STYLE_HINT_NONE);
}
void
nsIPresShell::SetForwardingContainer(const WeakPtr<nsDocShell> &aContainer)
{
mForwardingContainer = aContainer;
}
void
PresShell::ClearFrameRefs(nsIFrame* aFrame)
{
mPresContext->EventStateManager()->ClearFrameRefs(aFrame);
nsWeakFrame* weakFrame = mWeakFrames;
while (weakFrame) {
nsWeakFrame* prev = weakFrame->GetPreviousWeakFrame();
if (weakFrame->GetFrame() == aFrame) {
// This removes weakFrame from mWeakFrames.
weakFrame->Clear(this);
}
weakFrame = prev;
}
}
already_AddRefed<gfxContext>
PresShell::CreateReferenceRenderingContext()
{
nsDeviceContext* devCtx = mPresContext->DeviceContext();
RefPtr<gfxContext> rc;
if (mPresContext->IsScreen()) {
rc = new gfxContext(gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget());
} else {
// We assume the devCtx has positive width and height for this call.
// However, width and height, may be outside of the reasonable range
// so rc may still be null.
rc = devCtx->CreateRenderingContext();
if (!rc) {
return nullptr;
}
}
return rc.forget();
}
nsresult
PresShell::GoToAnchor(const nsAString& aAnchorName, bool aScroll,
uint32_t aAdditionalScrollFlags)
{
if (!mDocument) {
return NS_ERROR_FAILURE;
}
const Element *root = mDocument->GetRootElement();
if (root && root->IsSVGElement(nsGkAtoms::svg)) {
// We need to execute this even if there is an empty anchor name
// so that any existing SVG fragment identifier effect is removed
if (SVGFragmentIdentifier::ProcessFragmentIdentifier(mDocument, aAnchorName)) {
return NS_OK;
}
}
// Hold a reference to the ESM in case event dispatch tears us down.
RefPtr<EventStateManager> esm = mPresContext->EventStateManager();
if (aAnchorName.IsEmpty()) {
NS_ASSERTION(!aScroll, "can't scroll to empty anchor name");
esm->SetContentState(nullptr, NS_EVENT_STATE_URLTARGET);
return NS_OK;
}
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
nsresult rv = NS_OK;
nsCOMPtr<nsIContent> content;
// Search for an element with a matching "id" attribute
if (mDocument) {
content = mDocument->GetElementById(aAnchorName);
}
// Search for an anchor element with a matching "name" attribute
if (!content && htmlDoc) {
nsCOMPtr<nsIDOMNodeList> list;
// Find a matching list of named nodes
rv = htmlDoc->GetElementsByName(aAnchorName, getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Ensure it's an anchor element
content = do_QueryInterface(node);
if (content) {
if (content->IsHTMLElement(nsGkAtoms::a)) {
break;
}
content = nullptr;
}
}
}
}
// Search for anchor in the HTML namespace with a matching name
if (!content && !htmlDoc)
{
nsCOMPtr<nsIDOMDocument> doc = do_QueryInterface(mDocument);
nsCOMPtr<nsIDOMNodeList> list;
NS_NAMED_LITERAL_STRING(nameSpace, "http://www.w3.org/1999/xhtml");
// Get the list of anchor elements
rv = doc->GetElementsByTagNameNS(nameSpace, NS_LITERAL_STRING("a"), getter_AddRefs(list));
if (NS_SUCCEEDED(rv) && list) {
uint32_t i;
// Loop through the named nodes looking for the first anchor
for (i = 0; true; i++) {
nsCOMPtr<nsIDOMNode> node;
rv = list->Item(i, getter_AddRefs(node));
if (!node) { // End of list
break;
}
// Compare the name attribute
nsCOMPtr<nsIDOMElement> element = do_QueryInterface(node);
nsAutoString value;
if (element && NS_SUCCEEDED(element->GetAttribute(NS_LITERAL_STRING("name"), value))) {
if (value.Equals(aAnchorName)) {
content = do_QueryInterface(element);
break;
}
}
}
}
}
esm->SetContentState(content, NS_EVENT_STATE_URLTARGET);
#ifdef ACCESSIBILITY
nsIContent *anchorTarget = content;
#endif
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll && rootScroll->DidHistoryRestore()) {
// Scroll position restored from history trumps scrolling to anchor.
aScroll = false;
rootScroll->ClearDidHistoryRestore();
}
if (content) {
if (aScroll) {
rv = ScrollContentIntoView(content,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS | aAdditionalScrollFlags);
NS_ENSURE_SUCCESS(rv, rv);
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (rootScroll) {
mLastAnchorScrolledTo = content;
mLastAnchorScrollPositionY = rootScroll->GetScrollPosition().y;
}
}
// Should we select the target? This action is controlled by a
// preference: the default is to not select.
bool selectAnchor = Preferences::GetBool("layout.selectanchor");
// Even if select anchor pref is false, we must still move the
// caret there. That way tabbing will start from the new
// location
RefPtr<nsIDOMRange> jumpToRange = new nsRange(mDocument);
while (content && content->GetFirstChild()) {
content = content->GetFirstChild();
}
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(content));
NS_ASSERTION(node, "No nsIDOMNode for descendant of anchor");
jumpToRange->SelectNodeContents(node);
// Select the anchor
nsISelection* sel = mSelection->
GetSelection(nsISelectionController::SELECTION_NORMAL);
if (sel) {
sel->RemoveAllRanges();
sel->AddRange(jumpToRange);
if (!selectAnchor) {
// Use a caret (collapsed selection) at the start of the anchor
sel->CollapseToStart();
}
}
// Selection is at anchor.
// Now focus the document itself if focus is on an element within it.
nsPIDOMWindowOuter *win = mDocument->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
nsCOMPtr<mozIDOMWindowProxy> focusedWindow;
fm->GetFocusedWindow(getter_AddRefs(focusedWindow));
if (SameCOMIdentity(win, focusedWindow)) {
fm->ClearFocus(focusedWindow);
}
}
// If the target is an animation element, activate the animation
if (content->IsNodeOfType(nsINode::eANIMATION)) {
SVGContentUtils::ActivateByHyperlink(content.get());
}
} else {
rv = NS_ERROR_FAILURE;
NS_NAMED_LITERAL_STRING(top, "top");
if (nsContentUtils::EqualsIgnoreASCIICase(aAnchorName, top)) {
// Scroll to the top/left if aAnchorName is "top" and there is no element
// with such a name or id.
rv = NS_OK;
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
// Check |aScroll| after setting |rv| so we set |rv| to the same
// thing whether or not |aScroll| is true.
if (aScroll && sf) {
// Scroll to the top of the page
sf->ScrollTo(nsPoint(0, 0), nsIScrollableFrame::INSTANT);
}
}
}
#ifdef ACCESSIBILITY
if (anchorTarget) {
nsAccessibilityService* accService = AccService();
if (accService)
accService->NotifyOfAnchorJumpTo(anchorTarget);
}
#endif
return rv;
}
nsresult
PresShell::ScrollToAnchor()
{
if (!mLastAnchorScrolledTo) {
return NS_OK;
}
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIScrollableFrame* rootScroll = GetRootScrollFrameAsScrollable();
if (!rootScroll ||
mLastAnchorScrollPositionY != rootScroll->GetScrollPosition().y) {
return NS_OK;
}
nsresult rv = ScrollContentIntoView(mLastAnchorScrolledTo,
ScrollAxis(SCROLL_TOP, SCROLL_ALWAYS),
ScrollAxis(),
ANCHOR_SCROLL_FLAGS);
mLastAnchorScrolledTo = nullptr;
return rv;
}
/*
* Helper (per-continuation) for ScrollContentIntoView.
*
* @param aContainerFrame [in] the frame which aRect is relative to
* @param aFrame [in] Frame whose bounds should be unioned
* @param aUseWholeLineHeightForInlines [in] if true, then for inline frames
* we should include the top of the line in the added rectangle
* @param aRect [inout] rect into which its bounds should be unioned
* @param aHaveRect [inout] whether aRect contains data yet
* @param aPrevBlock [inout] the block aLines is a line iterator for
* @param aLines [inout] the line iterator we're using
* @param aCurLine [inout] the line to start looking from in this iterator
*/
static void
AccumulateFrameBounds(nsIFrame* aContainerFrame,
nsIFrame* aFrame,
bool aUseWholeLineHeightForInlines,
nsRect& aRect,
bool& aHaveRect,
nsIFrame*& aPrevBlock,
nsAutoLineIterator& aLines,
int32_t& aCurLine)
{
nsIFrame* frame = aFrame;
nsRect frameBounds = nsRect(nsPoint(0, 0), aFrame->GetSize());
// If this is an inline frame and either the bounds height is 0 (quirks
// layout model) or aUseWholeLineHeightForInlines is set, we need to
// change the top of the bounds to include the whole line.
if (frameBounds.height == 0 || aUseWholeLineHeightForInlines) {
nsIFrame *prevFrame = aFrame;
nsIFrame *f = aFrame;
while (f && f->IsFrameOfType(nsIFrame::eLineParticipant) &&
!f->IsTransformed() && !f->IsAbsPosContaininingBlock()) {
prevFrame = f;
f = prevFrame->GetParent();
}
if (f != aFrame &&
f &&
f->GetType() == nsGkAtoms::blockFrame) {
// find the line containing aFrame and increase the top of |offset|.
if (f != aPrevBlock) {
aLines = f->GetLineIterator();
aPrevBlock = f;
aCurLine = 0;
}
if (aLines) {
int32_t index = aLines->FindLineContaining(prevFrame, aCurLine);
if (index >= 0) {
aCurLine = index;
nsIFrame *trash1;
int32_t trash2;
nsRect lineBounds;
if (NS_SUCCEEDED(aLines->GetLine(index, &trash1, &trash2,
lineBounds))) {
frameBounds += frame->GetOffsetTo(f);
frame = f;
if (lineBounds.y < frameBounds.y) {
frameBounds.height = frameBounds.YMost() - lineBounds.y;
frameBounds.y = lineBounds.y;
}
}
}
}
}
}
nsRect transformedBounds = nsLayoutUtils::TransformFrameRectToAncestor(frame,
frameBounds, aContainerFrame);
if (aHaveRect) {
// We can't use nsRect::UnionRect since it drops empty rects on
// the floor, and we need to include them. (Thus we need
// aHaveRect to know when to drop the initial value on the floor.)
aRect.UnionRectEdges(aRect, transformedBounds);
} else {
aHaveRect = true;
aRect = transformedBounds;
}
}
static bool
ComputeNeedToScroll(nsIPresShell::WhenToScroll aWhenToScroll,
nscoord aLineSize,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax) {
// See how the rect should be positioned vertically
if (nsIPresShell::SCROLL_ALWAYS == aWhenToScroll) {
// The caller wants the frame as visible as possible
return true;
} else if (nsIPresShell::SCROLL_IF_NOT_VISIBLE == aWhenToScroll) {
// Scroll only if no part of the frame is visible in this view
return aRectMax - aLineSize <= aViewMin ||
aRectMin + aLineSize >= aViewMax;
} else if (nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE == aWhenToScroll) {
// Scroll only if part of the frame is hidden and more can fit in view
return !(aRectMin >= aViewMin && aRectMax <= aViewMax) &&
std::min(aViewMax, aRectMax) - std::max(aRectMin, aViewMin) < aViewMax - aViewMin;
}
return false;
}
static nscoord
ComputeWhereToScroll(int16_t aWhereToScroll,
nscoord aOriginalCoord,
nscoord aRectMin,
nscoord aRectMax,
nscoord aViewMin,
nscoord aViewMax,
nscoord* aRangeMin,
nscoord* aRangeMax) {
nscoord resultCoord = aOriginalCoord;
// Allow the scroll operation to land anywhere that
// makes the whole rectangle visible.
if (nsIPresShell::SCROLL_MINIMUM == aWhereToScroll) {
if (aRectMin < aViewMin) {
// Scroll up so the frame's top edge is visible
resultCoord = aRectMin;
} else if (aRectMax > aViewMax) {
// Scroll down so the frame's bottom edge is visible. Make sure the
// frame's top edge is still visible
resultCoord = aOriginalCoord + aRectMax - aViewMax;
if (resultCoord > aRectMin) {
resultCoord = aRectMin;
}
}
} else {
nscoord frameAlignCoord =
NSToCoordRound(aRectMin + (aRectMax - aRectMin) * (aWhereToScroll / 100.0f));
resultCoord = NSToCoordRound(frameAlignCoord - (aViewMax - aViewMin) * (
aWhereToScroll / 100.0f));
}
nscoord scrollPortLength = aViewMax - aViewMin;
// Force the scroll range to extend to include resultCoord.
*aRangeMin = std::min(resultCoord, aRectMax - scrollPortLength);
*aRangeMax = std::max(resultCoord, aRectMin);
return resultCoord;
}
/**
* This function takes a scrollable frame, a rect in the coordinate system
* of the scrolled frame, and a desired percentage-based scroll
* position and attempts to scroll the rect to that position in the
* scrollport.
*
* This needs to work even if aRect has a width or height of zero.
*/
static void ScrollToShowRect(nsIScrollableFrame* aFrameAsScrollable,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
nsPoint scrollPt = aFrameAsScrollable->GetScrollPosition();
nsRect visibleRect(scrollPt,
aFrameAsScrollable->GetScrollPositionClampingScrollPortSize());
nsSize lineSize;
// Don't call GetLineScrollAmount unless we actually need it. Not only
// does this save time, but it's not safe to call GetLineScrollAmount
// during reflow (because it depends on font size inflation and doesn't
// use the in-reflow-safe font-size inflation path). If we did call it,
// it would assert and possible give the wrong result.
if (aVertical.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE ||
aHorizontal.mWhenToScroll == nsIPresShell::SCROLL_IF_NOT_VISIBLE) {
lineSize = aFrameAsScrollable->GetLineScrollAmount();
}
ScrollbarStyles ss = aFrameAsScrollable->GetScrollbarStyles();
nsRect allowedRange(scrollPt, nsSize(0, 0));
bool needToScroll = false;
uint32_t directions = aFrameAsScrollable->GetPerceivedScrollingDirections();
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aVertical.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::VERTICAL))) {
if (ComputeNeedToScroll(aVertical.mWhenToScroll,
lineSize.height,
aRect.y,
aRect.YMost(),
visibleRect.y,
visibleRect.YMost())) {
nscoord maxHeight;
scrollPt.y = ComputeWhereToScroll(aVertical.mWhereToScroll,
scrollPt.y,
aRect.y,
aRect.YMost(),
visibleRect.y,
visibleRect.YMost(),
&allowedRange.y, &maxHeight);
allowedRange.height = maxHeight - allowedRange.y;
needToScroll = true;
}
}
if (((aFlags & nsIPresShell::SCROLL_OVERFLOW_HIDDEN) ||
ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN) &&
(!aHorizontal.mOnlyIfPerceivedScrollableDirection ||
(directions & nsIScrollableFrame::HORIZONTAL))) {
if (ComputeNeedToScroll(aHorizontal.mWhenToScroll,
lineSize.width,
aRect.x,
aRect.XMost(),
visibleRect.x,
visibleRect.XMost())) {
nscoord maxWidth;
scrollPt.x = ComputeWhereToScroll(aHorizontal.mWhereToScroll,
scrollPt.x,
aRect.x,
aRect.XMost(),
visibleRect.x,
visibleRect.XMost(),
&allowedRange.x, &maxWidth);
allowedRange.width = maxWidth - allowedRange.x;
needToScroll = true;
}
}
// If we don't need to scroll, then don't try since it might cancel
// a current smooth scroll operation.
if (needToScroll) {
nsIScrollableFrame::ScrollMode scrollMode = nsIScrollableFrame::INSTANT;
bool autoBehaviorIsSmooth = (aFrameAsScrollable->GetScrollbarStyles().mScrollBehavior
== NS_STYLE_SCROLL_BEHAVIOR_SMOOTH);
bool smoothScroll = (aFlags & nsIPresShell::SCROLL_SMOOTH) ||
((aFlags & nsIPresShell::SCROLL_SMOOTH_AUTO) && autoBehaviorIsSmooth);
if (gfxPrefs::ScrollBehaviorEnabled() && smoothScroll) {
scrollMode = nsIScrollableFrame::SMOOTH_MSD;
}
aFrameAsScrollable->ScrollTo(scrollPt, scrollMode, &allowedRange);
}
}
nsresult
PresShell::ScrollContentIntoView(nsIContent* aContent,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
NS_ENSURE_TRUE(aContent, NS_ERROR_NULL_POINTER);
nsCOMPtr<nsIDocument> composedDoc = aContent->GetComposedDoc();
NS_ENSURE_STATE(composedDoc);
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
}
mContentToScrollTo = aContent;
ScrollIntoViewData* data = new ScrollIntoViewData();
data->mContentScrollVAxis = aVertical;
data->mContentScrollHAxis = aHorizontal;
data->mContentToScrollToFlags = aFlags;
if (NS_FAILED(mContentToScrollTo->SetProperty(nsGkAtoms::scrolling, data,
nsINode::DeleteProperty<PresShell::ScrollIntoViewData>))) {
mContentToScrollTo = nullptr;
}
// Flush layout and attempt to scroll in the process.
composedDoc->SetNeedLayoutFlush();
composedDoc->FlushPendingNotifications(Flush_InterruptibleLayout);
// If mContentToScrollTo is non-null, that means we interrupted the reflow
// (or suppressed it altogether because we're suppressing interruptible
// flushes right now) and won't necessarily get the position correct, but do
// a best-effort scroll here. The other option would be to do this inside
// FlushPendingNotifications, but I'm not sure the repeated scrolling that
// could trigger if reflows keep getting interrupted would be more desirable
// than a single best-effort scroll followed by one final scroll on the first
// completed reflow.
if (mContentToScrollTo) {
DoScrollContentIntoView();
}
return NS_OK;
}
void
PresShell::DoScrollContentIntoView()
{
NS_ASSERTION(mDidInitialize, "should have done initial reflow by now");
nsIFrame* frame = mContentToScrollTo->GetPrimaryFrame();
if (!frame) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
return;
}
if (frame->GetStateBits() & NS_FRAME_FIRST_REFLOW) {
// The reflow flush before this scroll got interrupted, and this frame's
// coords and size are all zero, and it has no content showing anyway.
// Don't bother scrolling to it. We'll try again when we finish up layout.
return;
}
// Make sure we skip 'frame' ... if it's scrollable, we should use its
// scrollable ancestor as the container.
nsIFrame* container =
nsLayoutUtils::GetClosestFrameOfType(frame->GetParent(), nsGkAtoms::scrollFrame);
if (!container) {
// nothing can be scrolled
return;
}
ScrollIntoViewData* data = static_cast<ScrollIntoViewData*>(
mContentToScrollTo->GetProperty(nsGkAtoms::scrolling));
if (MOZ_UNLIKELY(!data)) {
mContentToScrollTo = nullptr;
return;
}
// This is a two-step process.
// Step 1: Find the bounds of the rect we want to scroll into view. For
// example, for an inline frame we may want to scroll in the whole
// line, or we may want to scroll multiple lines into view.
// Step 2: Walk container frame and its ancestors and scroll them
// appropriately.
// frameBounds is relative to container. We're assuming
// that scrollframes don't split so every continuation of frame will
// be a descendant of container. (Things would still mostly work
// even if that assumption was false.)
nsRect frameBounds;
bool haveRect = false;
bool useWholeLineHeightForInlines =
data->mContentScrollVAxis.mWhenToScroll != nsIPresShell::SCROLL_IF_NOT_FULLY_VISIBLE;
// Reuse the same line iterator across calls to AccumulateFrameBounds. We set
// it every time we detect a new block (stored in prevBlock).
nsIFrame* prevBlock = nullptr;
nsAutoLineIterator lines;
// The last line we found a continuation on in |lines|. We assume that later
// continuations cannot come on earlier lines.
int32_t curLine = 0;
do {
AccumulateFrameBounds(container, frame, useWholeLineHeightForInlines,
frameBounds, haveRect, prevBlock, lines, curLine);
} while ((frame = frame->GetNextContinuation()));
ScrollFrameRectIntoView(container, frameBounds, data->mContentScrollVAxis,
data->mContentScrollHAxis,
data->mContentToScrollToFlags);
}
bool
PresShell::ScrollFrameRectIntoView(nsIFrame* aFrame,
const nsRect& aRect,
nsIPresShell::ScrollAxis aVertical,
nsIPresShell::ScrollAxis aHorizontal,
uint32_t aFlags)
{
bool didScroll = false;
// This function needs to work even if rect has a width or height of 0.
nsRect rect = aRect;
nsIFrame* container = aFrame;
// Walk up the frame hierarchy scrolling the rect into view and
// keeping rect relative to container
do {
nsIScrollableFrame* sf = do_QueryFrame(container);
if (sf) {
nsPoint oldPosition = sf->GetScrollPosition();
nsRect targetRect = rect;
if (container->StyleDisplay()->mOverflowClipBox ==
NS_STYLE_OVERFLOW_CLIP_BOX_CONTENT_BOX) {
nsMargin padding = container->GetUsedPadding();
targetRect.Inflate(padding);
}
ScrollToShowRect(sf, targetRect - sf->GetScrolledFrame()->GetPosition(),
aVertical, aHorizontal, aFlags);
nsPoint newPosition = sf->GetScrollPosition();
// If the scroll position increased, that means our content moved up,
// so our rect's offset should decrease
rect += oldPosition - newPosition;
if (oldPosition != newPosition) {
didScroll = true;
}
// only scroll one container when this flag is set
if (aFlags & nsIPresShell::SCROLL_FIRST_ANCESTOR_ONLY) {
break;
}
}
nsIFrame* parent;
if (container->IsTransformed()) {
container->GetTransformMatrix(nullptr, &parent);
rect = nsLayoutUtils::TransformFrameRectToAncestor(container, rect, parent);
} else {
rect += container->GetPosition();
parent = container->GetParent();
}
if (!parent && !(aFlags & nsIPresShell::SCROLL_NO_PARENT_FRAMES)) {
nsPoint extraOffset(0,0);
parent = nsLayoutUtils::GetCrossDocParentFrame(container, &extraOffset);
if (parent) {
int32_t APD = container->PresContext()->AppUnitsPerDevPixel();
int32_t parentAPD = parent->PresContext()->AppUnitsPerDevPixel();
rect = rect.ScaleToOtherAppUnitsRoundOut(APD, parentAPD);
rect += extraOffset;
}
}
container = parent;
} while (container);
return didScroll;
}
nsRectVisibility
PresShell::GetRectVisibility(nsIFrame* aFrame,
const nsRect &aRect,
nscoord aMinTwips) const
{
NS_ASSERTION(aFrame->PresContext() == GetPresContext(),
"prescontext mismatch?");
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
NS_ASSERTION(rootFrame,
"How can someone have a frame for this presshell when there's no root?");
nsIScrollableFrame* sf = GetRootScrollFrameAsScrollable();
nsRect scrollPortRect;
if (sf) {
scrollPortRect = sf->GetScrollPortRect();
nsIFrame* f = do_QueryFrame(sf);
scrollPortRect += f->GetOffsetTo(rootFrame);
} else {
scrollPortRect = nsRect(nsPoint(0,0), rootFrame->GetSize());
}
nsRect r = aRect + aFrame->GetOffsetTo(rootFrame);
// If aRect is entirely visible then we don't need to ensure that
// at least aMinTwips of it is visible
if (scrollPortRect.Contains(r))
return nsRectVisibility_kVisible;
nsRect insetRect = scrollPortRect;
insetRect.Deflate(aMinTwips, aMinTwips);
if (r.YMost() <= insetRect.y)
return nsRectVisibility_kAboveViewport;
if (r.y >= insetRect.YMost())
return nsRectVisibility_kBelowViewport;
if (r.XMost() <= insetRect.x)
return nsRectVisibility_kLeftOfViewport;
if (r.x >= insetRect.XMost())
return nsRectVisibility_kRightOfViewport;
return nsRectVisibility_kVisible;
}
class PaintTimerCallBack final : public nsITimerCallback
{
public:
explicit PaintTimerCallBack(PresShell* aShell) : mShell(aShell) {}
NS_DECL_ISUPPORTS
NS_IMETHODIMP Notify(nsITimer* aTimer) final
{
mShell->SetNextPaintCompressed();
mShell->AddInvalidateHiddenPresShellObserver(mShell->GetPresContext()->RefreshDriver());
mShell->ScheduleViewManagerFlush();
return NS_OK;
}
private:
~PaintTimerCallBack() {}
PresShell* mShell;
};
NS_IMPL_ISUPPORTS(PaintTimerCallBack, nsITimerCallback)
void
PresShell::ScheduleViewManagerFlush(PaintType aType)
{
if (aType == PAINT_DELAYED_COMPRESS) {
// Delay paint for 1 second.
static const uint32_t kPaintDelayPeriod = 1000;
if (!mDelayedPaintTimer) {
mDelayedPaintTimer = do_CreateInstance(NS_TIMER_CONTRACTID);
RefPtr<PaintTimerCallBack> cb = new PaintTimerCallBack(this);
mDelayedPaintTimer->InitWithCallback(cb, kPaintDelayPeriod, nsITimer::TYPE_ONE_SHOT);
}
return;
}
nsPresContext* presContext = GetPresContext();
if (presContext) {
presContext->RefreshDriver()->ScheduleViewManagerFlush();
}
if (mDocument) {
mDocument->SetNeedLayoutFlush();
}
}
void
PresShell::DispatchSynthMouseMove(WidgetGUIEvent* aEvent,
bool aFlushOnHoverChange)
{
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (restyleManager->IsServo()) {
NS_ERROR("stylo: cannot dispatch synthetic mouse moves when using a "
"ServoRestyleManager yet");
return;
}
uint32_t hoverGenerationBefore =
restyleManager->AsGecko()->GetHoverGeneration();
nsEventStatus status;
nsView* targetView = nsView::GetViewFor(aEvent->widget);
if (!targetView)
return;
targetView->GetViewManager()->DispatchEvent(aEvent, targetView, &status);
if (MOZ_UNLIKELY(mIsDestroying)) {
return;
}
if (aFlushOnHoverChange &&
hoverGenerationBefore != restyleManager->AsGecko()->GetHoverGeneration()) {
// Flush so that the resulting reflow happens now so that our caller
// can suppress any synthesized mouse moves caused by that reflow.
FlushPendingNotifications(Flush_Layout);
}
}
void
PresShell::ClearMouseCaptureOnView(nsView* aView)
{
if (gCaptureInfo.mContent) {
if (aView) {
// if a view was specified, ensure that the captured content is within
// this view.
nsIFrame* frame = gCaptureInfo.mContent->GetPrimaryFrame();
if (frame) {
nsView* view = frame->GetClosestView();
// if there is no view, capturing won't be handled any more, so
// just release the capture.
if (view) {
do {
if (view == aView) {
gCaptureInfo.mContent = nullptr;
// the view containing the captured content likely disappeared so
// disable capture for now.
gCaptureInfo.mAllowed = false;
break;
}
view = view->GetParent();
} while (view);
// return if the view wasn't found
return;
}
}
}
gCaptureInfo.mContent = nullptr;
}
// disable mouse capture until the next mousedown as a dialog has opened
// or a drag has started. Otherwise, someone could start capture during
// the modal dialog or drag.
gCaptureInfo.mAllowed = false;
}
void
nsIPresShell::ClearMouseCapture(nsIFrame* aFrame)
{
if (!gCaptureInfo.mContent) {
gCaptureInfo.mAllowed = false;
return;
}
// null frame argument means clear the capture
if (!aFrame) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
nsIFrame* capturingFrame = gCaptureInfo.mContent->GetPrimaryFrame();
if (!capturingFrame) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
return;
}
if (nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, capturingFrame)) {
gCaptureInfo.mContent = nullptr;
gCaptureInfo.mAllowed = false;
}
}
nsresult
PresShell::CaptureHistoryState(nsILayoutHistoryState** aState)
{
NS_PRECONDITION(nullptr != aState, "null state pointer");
// We actually have to mess with the docshell here, since we want to
// store the state back in it.
// XXXbz this isn't really right, since this is being called in the
// content viewer's Hide() method... by that point the docshell's
// state could be wrong. We should sort out a better ownership
// model for the layout history state.
nsCOMPtr<nsIDocShell> docShell(mPresContext->GetDocShell());
if (!docShell)
return NS_ERROR_FAILURE;
nsCOMPtr<nsILayoutHistoryState> historyState;
docShell->GetLayoutHistoryState(getter_AddRefs(historyState));
if (!historyState) {
// Create the document state object
historyState = NS_NewLayoutHistoryState();
docShell->SetLayoutHistoryState(historyState);
}
*aState = historyState;
NS_IF_ADDREF(*aState);
// Capture frame state for the entire frame hierarchy
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) return NS_OK;
mFrameConstructor->CaptureFrameState(rootFrame, historyState);
return NS_OK;
}
void
PresShell::ScheduleBeforeFirstPaint()
{
if (!mDocument->IsResourceDoc()) {
// Notify observers that a new page is about to be drawn. Execute this
// as soon as it is safe to run JS, which is guaranteed to be before we
// go back to the event loop and actually draw the page.
nsContentUtils::AddScriptRunner(new nsBeforeFirstPaintDispatcher(mDocument));
}
}
void
PresShell::UnsuppressAndInvalidate()
{
// Note: We ignore the EnsureVisible check for resource documents, because
// they won't have a docshell, so they'll always fail EnsureVisible.
if ((!mDocument->IsResourceDoc() && !mPresContext->EnsureVisible()) ||
mHaveShutDown) {
// No point; we're about to be torn down anyway.
return;
}
ScheduleBeforeFirstPaint();
mPaintingSuppressed = false;
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
// let's assume that outline on a root frame is not supported
rootFrame->InvalidateFrame();
}
// now that painting is unsuppressed, focus may be set on the document
if (nsPIDOMWindowOuter* win = mDocument->GetWindow())
win->SetReadyForFocus();
if (!mHaveShutDown) {
SynthesizeMouseMove(false);
ScheduleImageVisibilityUpdate();
}
}
void
PresShell::UnsuppressPainting()
{
if (mPaintSuppressionTimer) {
mPaintSuppressionTimer->Cancel();
mPaintSuppressionTimer = nullptr;
}
if (mIsDocumentGone || !mPaintingSuppressed)
return;
// If we have reflows pending, just wait until we process
// the reflows and get all the frames where we want them
// before actually unlocking the painting. Otherwise
// go ahead and unlock now.
if (!mDirtyRoots.IsEmpty())
mShouldUnsuppressPainting = true;
else
UnsuppressAndInvalidate();
}
// Post a request to handle an arbitrary callback after reflow has finished.
nsresult
PresShell::PostReflowCallback(nsIReflowCallback* aCallback)
{
void* result = AllocateMisc(sizeof(nsCallbackEventRequest));
nsCallbackEventRequest* request = (nsCallbackEventRequest*)result;
request->callback = aCallback;
request->next = nullptr;
if (mLastCallbackEventRequest) {
mLastCallbackEventRequest = mLastCallbackEventRequest->next = request;
} else {
mFirstCallbackEventRequest = request;
mLastCallbackEventRequest = request;
}
return NS_OK;
}
void
PresShell::CancelReflowCallback(nsIReflowCallback* aCallback)
{
nsCallbackEventRequest* before = nullptr;
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
while(node)
{
nsIReflowCallback* callback = node->callback;
if (callback == aCallback)
{
nsCallbackEventRequest* toFree = node;
if (node == mFirstCallbackEventRequest) {
node = node->next;
mFirstCallbackEventRequest = node;
NS_ASSERTION(before == nullptr, "impossible");
} else {
node = node->next;
before->next = node;
}
if (toFree == mLastCallbackEventRequest) {
mLastCallbackEventRequest = before;
}
FreeMisc(sizeof(nsCallbackEventRequest), toFree);
} else {
before = node;
node = node->next;
}
}
}
void
PresShell::CancelPostedReflowCallbacks()
{
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
callback->ReflowCallbackCanceled();
}
}
}
void
PresShell::HandlePostedReflowCallbacks(bool aInterruptible)
{
bool shouldFlush = false;
while (mFirstCallbackEventRequest) {
nsCallbackEventRequest* node = mFirstCallbackEventRequest;
mFirstCallbackEventRequest = node->next;
if (!mFirstCallbackEventRequest) {
mLastCallbackEventRequest = nullptr;
}
nsIReflowCallback* callback = node->callback;
FreeMisc(sizeof(nsCallbackEventRequest), node);
if (callback) {
if (callback->ReflowFinished()) {
shouldFlush = true;
}
}
}
mozFlushType flushType =
aInterruptible ? Flush_InterruptibleLayout : Flush_Layout;
if (shouldFlush && !mIsDestroying) {
FlushPendingNotifications(flushType);
}
}
bool
PresShell::IsSafeToFlush() const
{
// Not safe if we are reflowing or in the middle of frame construction
bool isSafeToFlush = !mIsReflowing &&
!mChangeNestCount;
if (isSafeToFlush) {
// Not safe if we are painting
nsViewManager* viewManager = GetViewManager();
if (viewManager) {
bool isPainting = false;
viewManager->IsPainting(isPainting);
if (isPainting) {
isSafeToFlush = false;
}
}
}
return isSafeToFlush;
}
void
PresShell::FlushPendingNotifications(mozFlushType aType)
{
// by default, flush animations if aType >= Flush_Style
mozilla::ChangesToFlush flush(aType, aType >= Flush_Style);
FlushPendingNotifications(flush);
}
void
PresShell::FlushPendingNotifications(mozilla::ChangesToFlush aFlush)
{
if (mIsZombie) {
return;
}
/**
* VERY IMPORTANT: If you add some sort of new flushing to this
* method, make sure to add the relevant SetNeedLayoutFlush or
* SetNeedStyleFlush calls on the document.
*/
mozFlushType flushType = aFlush.mFlushType;
#ifdef MOZ_ENABLE_PROFILER_SPS
static const char flushTypeNames[][20] = {
"Content",
"ContentAndNotify",
"Style",
"InterruptibleLayout",
"Layout",
"Display"
};
// Make sure that we don't miss things added to mozFlushType!
MOZ_ASSERT(static_cast<uint32_t>(flushType) <= ArrayLength(flushTypeNames));
PROFILER_LABEL_PRINTF("PresShell", "Flush",
js::ProfileEntry::Category::GRAPHICS, "(Flush_%s)", flushTypeNames[flushType - 1]);
#endif
#ifdef ACCESSIBILITY
#ifdef DEBUG
nsAccessibilityService* accService = GetAccService();
if (accService) {
NS_ASSERTION(!accService->IsProcessingRefreshDriverNotification(),
"Flush during accessible tree update!");
}
#endif
#endif
NS_ASSERTION(flushType >= Flush_Frames, "Why did we get called?");
bool isSafeToFlush = IsSafeToFlush();
// If layout could possibly trigger scripts, then it's only safe to flush if
// it's safe to run script.
bool hasHadScriptObject;
if (mDocument->GetScriptHandlingObject(hasHadScriptObject) ||
hasHadScriptObject) {
isSafeToFlush = isSafeToFlush && nsContentUtils::IsSafeToRunScript();
}
NS_ASSERTION(!isSafeToFlush || mViewManager, "Must have view manager");
// Make sure the view manager stays alive.
RefPtr<nsViewManager> viewManagerDeathGrip = mViewManager;
bool didStyleFlush = false;
bool didLayoutFlush = false;
if (isSafeToFlush && mViewManager) {
// Processing pending notifications can kill us, and some callers only
// hold weak refs when calling FlushPendingNotifications(). :(
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
if (mResizeEvent.IsPending()) {
FireResizeEvent();
if (mIsDestroying) {
return;
}
}
// We need to make sure external resource documents are flushed too (for
// example, svg filters that reference a filter in an external document
// need the frames in the external document to be constructed for the
// filter to work). We only need external resources to be flushed when the
// main document is flushing >= Flush_Frames, so we flush external
// resources here instead of nsDocument::FlushPendingNotifications.
mDocument->FlushExternalResources(flushType);
// Force flushing of any pending content notifications that might have
// queued up while our event was pending. That will ensure that we don't
// construct frames for content right now that's still waiting to be
// notified on,
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
// Process pending restyles, since any flush of the presshell wants
// up-to-date style data.
if (!mIsDestroying) {
mViewManager->FlushDelayedResize(false);
mPresContext->FlushPendingMediaFeatureValuesChanged();
// Flush any pending update of the user font set, since that could
// cause style changes (for updating ex/ch units, and to cause a
// reflow).
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
// Flush any requested SMIL samples.
if (mDocument->HasAnimationController()) {
mDocument->GetAnimationController()->FlushResampleRequests();
}
if (aFlush.mFlushAnimations && mPresContext->EffectCompositor()) {
mPresContext->EffectCompositor()->PostRestyleForThrottledAnimations();
}
// The FlushResampleRequests() above flushed style changes.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
}
// Dispatch any 'animationstart' events those (or earlier) restyles
// queued up.
if (!mIsDestroying) {
mPresContext->AnimationManager()->DispatchEvents();
}
// Process whatever XBL constructors those restyles queued up. This
// ensures that onload doesn't fire too early and that we won't do extra
// reflows after those constructors run.
if (!mIsDestroying) {
mDocument->BindingManager()->ProcessAttachedQueue();
}
// Now those constructors or events might have posted restyle
// events. At the same time, we still need up-to-date style data.
// In particular, reflow depends on style being completely up to
// date. If it's not, then style context reparenting, which can
// happen during reflow, might suddenly pick up the new rules and
// we'll end up with frames whose style doesn't match the frame
// type.
if (!mIsDestroying) {
nsAutoScriptBlocker scriptBlocker;
mPresContext->RestyleManager()->ProcessPendingRestyles();
}
didStyleFlush = true;
// There might be more pending constructors now, but we're not going to
// worry about them. They can't be triggered during reflow, so we should
// be good.
if (flushType >= (mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout) &&
!mIsDestroying) {
didLayoutFlush = true;
mFrameConstructor->RecalcQuotesAndCounters();
mViewManager->FlushDelayedResize(true);
if (ProcessReflowCommands(flushType < Flush_Layout) && mContentToScrollTo) {
// We didn't get interrupted. Go ahead and scroll to our content
DoScrollContentIntoView();
if (mContentToScrollTo) {
mContentToScrollTo->DeleteProperty(nsGkAtoms::scrolling);
mContentToScrollTo = nullptr;
}
}
}
if (flushType >= Flush_Layout) {
if (!mIsDestroying) {
mViewManager->UpdateWidgetGeometry();
}
}
}
if (!didStyleFlush && flushType >= Flush_Style && !mIsDestroying) {
mDocument->SetNeedStyleFlush();
}
if (!didLayoutFlush && !mIsDestroying &&
(flushType >=
(mSuppressInterruptibleReflows ? Flush_Layout : Flush_InterruptibleLayout))) {
// We suppressed this flush due to mSuppressInterruptibleReflows or
// !isSafeToFlush, but the document thinks it doesn't
// need to flush anymore. Let it know what's really going on.
mDocument->SetNeedLayoutFlush();
}
}
void
PresShell::CharacterDataChanged(nsIDocument *aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected CharacterDataChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent *container = aContent->GetParent();
uint32_t selectorFlags =
container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
if (selectorFlags != 0 && !aContent->IsRootOfAnonymousSubtree()) {
Element* element = container->AsElement();
if (aInfo->mAppend && !aContent->GetNextSibling())
mPresContext->RestyleManager()->RestyleForAppend(element, aContent);
else
mPresContext->RestyleManager()->RestyleForInsertOrChange(element, aContent);
}
mFrameConstructor->CharacterDataChanged(aContent, aInfo);
VERIFY_STYLE_TREE;
}
void
PresShell::ContentStateChanged(nsIDocument* aDocument,
nsIContent* aContent,
EventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentStateChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->ContentStateChanged(aContent, aStateMask);
VERIFY_STYLE_TREE;
}
}
void
PresShell::DocumentStatesChanged(nsIDocument* aDocument,
EventStates aStateMask)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected DocumentStatesChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
nsStyleSet* styleSet = mStyleSet->GetAsGecko();
if (!styleSet) {
// XXXheycam ServoStyleSets don't support document state selectors,
// but these are only used in chrome documents, which we are not
// aiming to support yet.
NS_ERROR("stylo: ServoStyleSets cannot respond to document state "
"changes yet");
return;
}
if (mDidInitialize &&
styleSet->HasDocumentStateDependentStyle(mDocument->GetRootElement(),
aStateMask)) {
mPresContext->RestyleManager()->PostRestyleEvent(mDocument->GetRootElement(),
eRestyle_Subtree,
NS_STYLE_HINT_NONE);
VERIFY_STYLE_TREE;
}
if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
nsIFrame* root = mFrameConstructor->GetRootFrame();
if (root) {
root->SchedulePaint();
}
}
}
void
PresShell::AttributeWillChange(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aNewValue)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeWillChange");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeWillChange(aElement, aNameSpaceID,
aAttribute, aModType,
aNewValue);
VERIFY_STYLE_TREE;
}
}
void
PresShell::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType,
const nsAttrValue* aOldValue)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected AttributeChanged");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// XXXwaterson it might be more elegant to wait until after the
// initial reflow to begin observing the document. That would
// squelch any other inappropriate notifications as well.
if (mDidInitialize) {
nsAutoCauseReflowNotifier crNotifier(this);
mPresContext->RestyleManager()->AttributeChanged(aElement, aNameSpaceID,
aAttribute, aModType,
aOldValue);
VERIFY_STYLE_TREE;
}
}
void
PresShell::ContentAppended(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentAppended");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
NS_PRECONDITION(aContainer, "must have container");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
if (aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
mPresContext->RestyleManager()->
RestyleForAppend(aContainer->AsElement(), aFirstNewContent);
}
mFrameConstructor->ContentAppended(aContainer, aFirstNewContent, true);
if (static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument) &&
aFirstNewContent->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentInserted");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
if (!mDidInitialize) {
return;
}
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
if (aContainer && aContainer->IsElement()) {
// Ensure the container is an element before trying to restyle
// because it can be the case that the container is a ShadowRoot
// which is a document fragment.
mPresContext->RestyleManager()->
RestyleForInsertOrChange(aContainer->AsElement(), aChild);
}
mFrameConstructor->ContentInserted(aContainer, aChild, nullptr, true);
if (((!aContainer && aDocument) ||
(static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument))) &&
aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::ContentRemoved(nsIDocument *aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
NS_PRECONDITION(!mIsDocumentGone, "Unexpected ContentRemoved");
NS_PRECONDITION(aDocument == mDocument, "Unexpected aDocument");
// Notify the ESM that the content has been removed, so that
// it can clean up any state related to the content.
// XXX_jwir3: There is no null check for aDocument necessary, since, even
// though by nsIMutationObserver, aDocument could be null, the
// precondition check that mDocument == aDocument ensures that
// aDocument will not be null (since mDocument can't be null unless
// we're still intializing).
mPresContext->EventStateManager()->ContentRemoved(aDocument, aChild);
nsAutoCauseReflowNotifier crNotifier(this);
// Call this here so it only happens for real content mutations and
// not cases when the frame constructor calls its own methods to force
// frame reconstruction.
nsIContent* oldNextSibling;
if (aContainer) {
oldNextSibling = aContainer->GetChildAt(aIndexInContainer);
} else {
oldNextSibling = nullptr;
}
if (aContainer && aContainer->IsElement()) {
mPresContext->RestyleManager()->
RestyleForRemove(aContainer->AsElement(), aChild, oldNextSibling);
}
// After removing aChild from tree we should save information about live ancestor
if (mPointerEventTarget) {
if (nsContentUtils::ContentIsDescendantOf(mPointerEventTarget, aChild)) {
mPointerEventTarget = aContainer;
}
}
// We should check that aChild does not contain pointer capturing elements.
// If it does we should release the pointer capture for the elements.
for (auto iter = gPointerCaptureList->Iter(); !iter.Done(); iter.Next()) {
nsIPresShell::PointerCaptureInfo* data = iter.UserData();
if (data && data->mOverrideContent &&
nsContentUtils::ContentIsDescendantOf(data->mOverrideContent,
aChild)) {
nsIPresShell::ReleasePointerCapturingContent(iter.Key());
}
}
bool didReconstruct;
mFrameConstructor->ContentRemoved(aContainer, aChild, oldNextSibling,
nsCSSFrameConstructor::REMOVE_CONTENT,
&didReconstruct);
if (((aContainer &&
static_cast<nsINode*>(aContainer) == static_cast<nsINode*>(aDocument)) ||
aDocument) && aChild->NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
NotifyFontSizeInflationEnabledIsDirty();
}
VERIFY_STYLE_TREE;
}
void
PresShell::NotifyCounterStylesAreDirty()
{
nsAutoCauseReflowNotifier reflowNotifier(this);
mFrameConstructor->BeginUpdate();
mFrameConstructor->NotifyCounterStylesAreDirty();
mFrameConstructor->EndUpdate();
}
nsresult
PresShell::ReconstructFrames(void)
{
NS_PRECONDITION(!mFrameConstructor->GetRootFrame() || mDidInitialize,
"Must not have root frame before initial reflow");
if (!mDidInitialize) {
// Nothing to do here
return NS_OK;
}
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
nsAutoCauseReflowNotifier crNotifier(this);
mFrameConstructor->BeginUpdate();
nsresult rv = mFrameConstructor->ReconstructDocElementHierarchy();
VERIFY_STYLE_TREE;
mFrameConstructor->EndUpdate();
return rv;
}
void
nsIPresShell::ReconstructStyleDataInternal()
{
AutoTArray<RefPtr<mozilla::dom::Element>,1> scopeRoots;
mChangedScopeStyleRoots.SwapElements(scopeRoots);
if (mStylesHaveChanged) {
// If we need to restyle everything, no need to restyle individual
// scoped style roots.
scopeRoots.Clear();
}
mStylesHaveChanged = false;
if (mIsDestroying) {
// We don't want to mess with restyles at this point
return;
}
mDocument->RebuildUserFontSet();
if (mPresContext) {
mPresContext->RebuildCounterStyles();
}
Element* root = mDocument->GetRootElement();
if (!mDidInitialize) {
// Nothing to do here, since we have no frames yet
return;
}
if (!root) {
// No content to restyle
return;
}
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (scopeRoots.IsEmpty()) {
// If scopeRoots is empty, we know that mStylesHaveChanged was true at
// the beginning of this function, and that we need to restyle the whole
// document.
restyleManager->PostRestyleEvent(root, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
} else {
for (Element* scopeRoot : scopeRoots) {
restyleManager->PostRestyleEvent(scopeRoot, eRestyle_Subtree,
NS_STYLE_HINT_NONE);
}
}
}
void
nsIPresShell::ReconstructStyleDataExternal()
{
ReconstructStyleDataInternal();
}
void
PresShell::RecordStyleSheetChange(StyleSheetHandle aStyleSheet)
{
// too bad we can't check that the update is UPDATE_STYLE
NS_ASSERTION(mUpdateCount != 0, "must be in an update");
if (mStylesHaveChanged)
return;
if (aStyleSheet->IsGecko()) {
// XXXheycam ServoStyleSheets don't support <style scoped> yet.
Element* scopeElement = aStyleSheet->AsGecko()->GetScopeElement();
if (scopeElement) {
mChangedScopeStyleRoots.AppendElement(scopeElement);
return;
}
} else {
NS_ERROR("stylo: ServoStyleSheets don't support <style scoped>");
}
mStylesHaveChanged = true;
}
void
PresShell::StyleSheetAdded(StyleSheetHandle aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are added
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetRemoved(StyleSheetHandle aStyleSheet,
bool aDocumentSheet)
{
// We only care when enabled sheets are removed
NS_PRECONDITION(aStyleSheet, "Must have a style sheet!");
if (aStyleSheet->IsApplicable() && aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleSheetApplicableStateChanged(StyleSheetHandle aStyleSheet)
{
if (aStyleSheet->HasRules()) {
RecordStyleSheetChange(aStyleSheet);
}
}
void
PresShell::StyleRuleChanged(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleAdded(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
void
PresShell::StyleRuleRemoved(StyleSheetHandle aStyleSheet)
{
RecordStyleSheetChange(aStyleSheet);
}
nsIFrame*
PresShell::GetRealPrimaryFrameFor(nsIContent* aContent) const
{
if (aContent->GetComposedDoc() != GetDocument()) {
return nullptr;
}
nsIFrame *primaryFrame = aContent->GetPrimaryFrame();
if (!primaryFrame)
return nullptr;
return nsPlaceholderFrame::GetRealFrameFor(primaryFrame);
}
nsIFrame*
PresShell::GetPlaceholderFrameFor(nsIFrame* aFrame) const
{
return mFrameConstructor->GetPlaceholderFrameFor(aFrame);
}
nsresult
PresShell::RenderDocument(const nsRect& aRect, uint32_t aFlags,
nscolor aBackgroundColor,
gfxContext* aThebesContext)
{
NS_ENSURE_TRUE(!(aFlags & RENDER_IS_UNTRUSTED), NS_ERROR_NOT_IMPLEMENTED);
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return NS_OK;
}
nsAutoScriptBlocker blockScripts;
// Set up the rectangle as the path in aThebesContext
gfxRect r(0, 0,
nsPresContext::AppUnitsToFloatCSSPixels(aRect.width),
nsPresContext::AppUnitsToFloatCSSPixels(aRect.height));
aThebesContext->NewPath();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
aThebesContext->Rectangle(r, true);
#else
aThebesContext->Rectangle(r);
#endif
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
// Nothing to paint, just fill the rect
aThebesContext->SetColor(Color::FromABGR(aBackgroundColor));
aThebesContext->Fill();
return NS_OK;
}
gfxContextAutoSaveRestore save(aThebesContext);
MOZ_ASSERT(aThebesContext->CurrentOp() == CompositionOp::OP_OVER);
aThebesContext->Clip();
nsDeviceContext* devCtx = mPresContext->DeviceContext();
gfxPoint offset(-nsPresContext::AppUnitsToFloatCSSPixels(aRect.x),
-nsPresContext::AppUnitsToFloatCSSPixels(aRect.y));
gfxFloat scale = gfxFloat(devCtx->AppUnitsPerDevPixel())/nsPresContext::AppUnitsPerCSSPixel();
// Since canvas APIs use floats to set up their matrices, we may have some
// slight rounding errors here. We use NudgeToIntegers() here to adjust
// matrix components that are integers up to the accuracy of floats to be
// those integers.
gfxMatrix newTM = aThebesContext->CurrentMatrix().Translate(offset).
Scale(scale, scale).
NudgeToIntegers();
aThebesContext->SetMatrix(newTM);
AutoSaveRestoreRenderingState _(this);
nsRenderingContext rc(aThebesContext);
bool wouldFlushRetainedLayers = false;
uint32_t flags = nsLayoutUtils::PAINT_IGNORE_SUPPRESSION;
if (aThebesContext->CurrentMatrix().HasNonIntegerTranslation()) {
flags |= nsLayoutUtils::PAINT_IN_TRANSFORM;
}
if (!(aFlags & RENDER_ASYNC_DECODE_IMAGES)) {
flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
}
if (aFlags & RENDER_USE_WIDGET_LAYERS) {
// We only support using widget layers on display root's with widgets.
nsView* view = rootFrame->GetView();
if (view && view->GetWidget() &&
nsLayoutUtils::GetDisplayRootFrame(rootFrame) == rootFrame) {
LayerManager* layerManager = view->GetWidget()->GetLayerManager();
// ClientLayerManagers in content processes don't support
// taking snapshots.
if (layerManager &&
(!layerManager->AsClientLayerManager() ||
XRE_IsParentProcess())) {
flags |= nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
}
}
if (!(aFlags & RENDER_CARET)) {
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_HIDE_CARET;
}
if (aFlags & RENDER_IGNORE_VIEWPORT_SCROLLING) {
wouldFlushRetainedLayers = !IgnoringViewportScrolling();
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_IGNORING_VIEWPORT_SCROLLING);
}
if (aFlags & RENDER_DRAWWINDOW_NOT_FLUSHING) {
mRenderFlags = ChangeFlag(mRenderFlags, true, STATE_DRAWWINDOW_NOT_FLUSHING);
}
if (aFlags & RENDER_DOCUMENT_RELATIVE) {
// XXX be smarter about this ... drawWindow might want a rect
// that's "pretty close" to what our retained layer tree covers.
// In that case, it wouldn't disturb normal rendering too much,
// and we should allow it.
wouldFlushRetainedLayers = true;
flags |= nsLayoutUtils::PAINT_DOCUMENT_RELATIVE;
}
// Don't let drawWindow blow away our retained layer tree
if ((flags & nsLayoutUtils::PAINT_WIDGET_LAYERS) && wouldFlushRetainedLayers) {
flags &= ~nsLayoutUtils::PAINT_WIDGET_LAYERS;
}
nsLayoutUtils::PaintFrame(&rc, rootFrame, nsRegion(aRect),
aBackgroundColor, flags);
return NS_OK;
}
/*
* Clip the display list aList to a range. Returns the clipped
* rectangle surrounding the range.
*/
nsRect
PresShell::ClipListToRange(nsDisplayListBuilder *aBuilder,
nsDisplayList* aList,
nsRange* aRange)
{
// iterate though the display items and add up the bounding boxes of each.
// This will allow the total area of the frames within the range to be
// determined. To do this, remove an item from the bottom of the list, check
// whether it should be part of the range, and if so, append it to the top
// of the temporary list tmpList. If the item is a text frame at the end of
// the selection range, clip it to the portion of the text frame that is
// part of the selection. Then, append the wrapper to the top of the list.
// Otherwise, just delete the item and don't append it.
nsRect surfaceRect;
nsDisplayList tmpList;
nsDisplayItem* i;
while ((i = aList->RemoveBottom())) {
// itemToInsert indiciates the item that should be inserted into the
// temporary list. If null, no item should be inserted.
nsDisplayItem* itemToInsert = nullptr;
nsIFrame* frame = i->Frame();
nsIContent* content = frame->GetContent();
if (content) {
bool atStart = (content == aRange->GetStartParent());
bool atEnd = (content == aRange->GetEndParent());
if ((atStart || atEnd) && frame->GetType() == nsGkAtoms::textFrame) {
int32_t frameStartOffset, frameEndOffset;
frame->GetOffsets(frameStartOffset, frameEndOffset);
int32_t hilightStart =
atStart ? std::max(aRange->StartOffset(), frameStartOffset) : frameStartOffset;
int32_t hilightEnd =
atEnd ? std::min(aRange->EndOffset(), frameEndOffset) : frameEndOffset;
if (hilightStart < hilightEnd) {
// determine the location of the start and end edges of the range.
nsPoint startPoint, endPoint;
frame->GetPointFromOffset(hilightStart, &startPoint);
frame->GetPointFromOffset(hilightEnd, &endPoint);
// The clip rectangle is determined by taking the the start and
// end points of the range, offset from the reference frame.
// Because of rtl, the end point may be to the left of (or above,
// in vertical mode) the start point, so x (or y) is set to the
// lower of the values.
nsRect textRect(aBuilder->ToReferenceFrame(frame), frame->GetSize());
if (frame->GetWritingMode().IsVertical()) {
nscoord y = std::min(startPoint.y, endPoint.y);
textRect.y += y;
textRect.height = std::max(startPoint.y, endPoint.y) - y;
} else {
nscoord x = std::min(startPoint.x, endPoint.x);
textRect.x += x;
textRect.width = std::max(startPoint.x, endPoint.x) - x;
}
surfaceRect.UnionRect(surfaceRect, textRect);
DisplayItemClip newClip;
newClip.SetTo(textRect);
newClip.IntersectWith(i->GetClip());
i->SetClip(aBuilder, newClip);
itemToInsert = i;
}
}
// Don't try to descend into subdocuments.
// If this ever changes we'd need to add handling for subdocuments with
// different zoom levels.
else if (content->GetCurrentDoc() ==
aRange->GetStartParent()->GetCurrentDoc()) {
// if the node is within the range, append it to the temporary list
bool before, after;
nsresult rv =
nsRange::CompareNodeToRange(content, aRange, &before, &after);
if (NS_SUCCEEDED(rv) && !before && !after) {
itemToInsert = i;
bool snap;
surfaceRect.UnionRect(surfaceRect, i->GetBounds(aBuilder, &snap));
}
}
}
// insert the item into the list if necessary. If the item has a child
// list, insert that as well
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (itemToInsert || sublist) {
tmpList.AppendToTop(itemToInsert ? itemToInsert : i);
// if the item is a list, iterate over it as well
if (sublist)
surfaceRect.UnionRect(surfaceRect,
ClipListToRange(aBuilder, sublist, aRange));
}
else {
// otherwise, just delete the item and don't readd it to the list
i->~nsDisplayItem();
}
}
// now add all the items back onto the original list again
aList->AppendToTop(&tmpList);
return surfaceRect;
}
#ifdef DEBUG
#include <stdio.h>
static bool gDumpRangePaintList = false;
#endif
UniquePtr<RangePaintInfo>
PresShell::CreateRangePaintInfo(nsIDOMRange* aRange,
nsRect& aSurfaceRect,
bool aForPrimarySelection)
{
nsRange* range = static_cast<nsRange*>(aRange);
nsIFrame* ancestorFrame;
nsIFrame* rootFrame = GetRootFrame();
// If the start or end of the range is the document, just use the root
// frame, otherwise get the common ancestor of the two endpoints of the
// range.
nsINode* startParent = range->GetStartParent();
nsINode* endParent = range->GetEndParent();
nsIDocument* doc = startParent->GetCrossShadowCurrentDoc();
if (startParent == doc || endParent == doc) {
ancestorFrame = rootFrame;
}
else {
nsINode* ancestor = nsContentUtils::GetCommonAncestor(startParent, endParent);
NS_ASSERTION(!ancestor || ancestor->IsNodeOfType(nsINode::eCONTENT),
"common ancestor is not content");
if (!ancestor || !ancestor->IsNodeOfType(nsINode::eCONTENT))
return nullptr;
nsIContent* ancestorContent = static_cast<nsIContent*>(ancestor);
ancestorFrame = ancestorContent->GetPrimaryFrame();
// use the nearest ancestor frame that includes all continuations as the
// root for building the display list
while (ancestorFrame &&
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(ancestorFrame))
ancestorFrame = ancestorFrame->GetParent();
}
if (!ancestorFrame)
return nullptr;
auto info = MakeUnique<RangePaintInfo>(range, ancestorFrame);
// get a display list containing the range
info->mBuilder.SetIncludeAllOutOfFlows();
if (aForPrimarySelection) {
info->mBuilder.SetSelectedFramesOnly();
}
info->mBuilder.EnterPresShell(ancestorFrame);
ancestorFrame->BuildDisplayListForStackingContext(&info->mBuilder,
ancestorFrame->GetVisualOverflowRect(), &info->mList);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- before ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
nsRect rangeRect = ClipListToRange(&info->mBuilder, &info->mList, range);
info->mBuilder.LeavePresShell(ancestorFrame);
#ifdef DEBUG
if (gDumpRangePaintList) {
fprintf(stderr, "CreateRangePaintInfo --- after ClipListToRange:\n");
nsFrame::PrintDisplayList(&(info->mBuilder), info->mList);
}
#endif
// determine the offset of the reference frame for the display list
// to the root frame. This will allow the coordinates used when painting
// to all be offset from the same point
info->mRootOffset = ancestorFrame->GetOffsetTo(rootFrame);
rangeRect.MoveBy(info->mRootOffset);
aSurfaceRect.UnionRect(aSurfaceRect, rangeRect);
return info;
}
already_AddRefed<SourceSurface>
PresShell::PaintRangePaintInfo(const nsTArray<UniquePtr<RangePaintInfo>>& aItems,
nsISelection* aSelection,
nsIntRegion* aRegion,
nsRect aArea,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
nsPresContext* pc = GetPresContext();
if (!pc || aArea.width == 0 || aArea.height == 0)
return nullptr;
// use the rectangle to create the surface
nsIntRect pixelArea = aArea.ToOutsidePixels(pc->AppUnitsPerDevPixel());
// if the area of the image is larger than the maximum area, scale it down
float scale = 0.0;
nsIntRect rootScreenRect =
GetRootFrame()->GetScreenRectInAppUnits().ToNearestPixels(
pc->AppUnitsPerDevPixel());
// if the image is larger in one or both directions than half the size of
// the available screen area, scale the image down to that size.
nsRect maxSize;
pc->DeviceContext()->GetClientRect(maxSize);
nscoord maxWidth = pc->AppUnitsToDevPixels(maxSize.width >> 1);
nscoord maxHeight = pc->AppUnitsToDevPixels(maxSize.height >> 1);
bool resize = (aFlags & RENDER_AUTO_SCALE) &&
(pixelArea.width > maxWidth || pixelArea.height > maxHeight);
if (resize) {
scale = 1.0;
// divide the maximum size by the image size in both directions. Whichever
// direction produces the smallest result determines how much should be
// scaled.
if (pixelArea.width > maxWidth)
scale = std::min(scale, float(maxWidth) / pixelArea.width);
if (pixelArea.height > maxHeight)
scale = std::min(scale, float(maxHeight) / pixelArea.height);
pixelArea.width = NSToIntFloor(float(pixelArea.width) * scale);
pixelArea.height = NSToIntFloor(float(pixelArea.height) * scale);
if (!pixelArea.width || !pixelArea.height)
return nullptr;
// adjust the screen position based on the rescaled size
nscoord left = rootScreenRect.x + pixelArea.x;
nscoord top = rootScreenRect.y + pixelArea.y;
aScreenRect->x = NSToIntFloor(aPoint.x - float(aPoint.x - left) * scale);
aScreenRect->y = NSToIntFloor(aPoint.y - float(aPoint.y - top) * scale);
}
else {
// move aScreenRect to the position of the surface in screen coordinates
aScreenRect->MoveTo(rootScreenRect.x + pixelArea.x, rootScreenRect.y + pixelArea.y);
}
aScreenRect->width = pixelArea.width;
aScreenRect->height = pixelArea.height;
RefPtr<DrawTarget> dt =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelArea.width, pixelArea.height),
SurfaceFormat::B8G8R8A8);
if (!dt) {
return nullptr;
}
RefPtr<gfxContext> ctx = new gfxContext(dt);
if (aRegion) {
// Convert aRegion from CSS pixels to dev pixels
nsIntRegion region =
aRegion->ToAppUnits(nsPresContext::AppUnitsPerCSSPixel())
.ToOutsidePixels(pc->AppUnitsPerDevPixel());
for (auto iter = region.RectIter(); !iter.Done(); iter.Next()) {
const nsIntRect& rect = iter.Get();
ctx->Clip(gfxRect(rect.x, rect.y, rect.width, rect.height));
}
}
nsRenderingContext rc(ctx);
gfxMatrix initialTM = ctx->CurrentMatrix();
if (resize)
initialTM.Scale(scale, scale);
// translate so that points are relative to the surface area
gfxPoint surfaceOffset =
nsLayoutUtils::PointToGfxPoint(-aArea.TopLeft(), pc->AppUnitsPerDevPixel());
initialTM.Translate(surfaceOffset);
// temporarily hide the selection so that text is drawn normally. If a
// selection is being rendered, use that, otherwise use the presshell's
// selection.
RefPtr<nsFrameSelection> frameSelection;
if (aSelection) {
frameSelection = static_cast<Selection*>(aSelection)->GetFrameSelection();
}
else {
frameSelection = FrameSelection();
}
int16_t oldDisplaySelection = frameSelection->GetDisplaySelection();
frameSelection->SetDisplaySelection(nsISelectionController::SELECTION_HIDDEN);
// next, paint each range in the selection
for (const UniquePtr<RangePaintInfo>& rangeInfo : aItems) {
// the display lists paint relative to the offset from the reference
// frame, so account for that translation too:
gfxPoint rootOffset =
nsLayoutUtils::PointToGfxPoint(rangeInfo->mRootOffset,
pc->AppUnitsPerDevPixel());
ctx->SetMatrix(initialTM.Translate(rootOffset));
aArea.MoveBy(-rangeInfo->mRootOffset.x, -rangeInfo->mRootOffset.y);
nsRegion visible(aArea);
RefPtr<LayerManager> layerManager =
rangeInfo->mList.PaintRoot(&rangeInfo->mBuilder, &rc,
nsDisplayList::PAINT_DEFAULT);
aArea.MoveBy(rangeInfo->mRootOffset.x, rangeInfo->mRootOffset.y);
}
// restore the old selection display state
frameSelection->SetDisplaySelection(oldDisplaySelection);
return dt->Snapshot();
}
already_AddRefed<SourceSurface>
PresShell::RenderNode(nsIDOMNode* aNode,
nsIntRegion* aRegion,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the node, measured
// from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// nothing to draw if the node isn't in a document
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
if (!node->IsInDoc())
return nullptr;
RefPtr<nsRange> range = new nsRange(node);
if (NS_FAILED(range->SelectNode(aNode)))
return nullptr;
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, false);
if (info && !rangeItems.AppendElement(Move(info))) {
return nullptr;
}
if (aRegion) {
// combine the area with the supplied region
nsIntRect rrectPixels = aRegion->GetBounds();
nsRect rrect = ToAppUnits(rrectPixels, nsPresContext::AppUnitsPerCSSPixel());
area.IntersectRect(area, rrect);
nsPresContext* pc = GetPresContext();
if (!pc)
return nullptr;
// move the region so that it is offset from the topleft corner of the surface
aRegion->MoveBy(-pc->AppUnitsToDevPixels(area.x),
-pc->AppUnitsToDevPixels(area.y));
}
return PaintRangePaintInfo(rangeItems, nullptr, aRegion, area, aPoint,
aScreenRect, aFlags);
}
already_AddRefed<SourceSurface>
PresShell::RenderSelection(nsISelection* aSelection,
nsIntPoint& aPoint,
nsIntRect* aScreenRect,
uint32_t aFlags)
{
// area will hold the size of the surface needed to draw the selection,
// measured from the root frame.
nsRect area;
nsTArray<UniquePtr<RangePaintInfo>> rangeItems;
// iterate over each range and collect them into the rangeItems array.
// This is done so that the size of selection can be determined so as
// to allocate a surface area
int32_t numRanges;
aSelection->GetRangeCount(&numRanges);
NS_ASSERTION(numRanges > 0, "RenderSelection called with no selection");
for (int32_t r = 0; r < numRanges; r++)
{
nsCOMPtr<nsIDOMRange> range;
aSelection->GetRangeAt(r, getter_AddRefs(range));
UniquePtr<RangePaintInfo> info = CreateRangePaintInfo(range, area, true);
if (info && !rangeItems.AppendElement(Move(info))) {
return nullptr;
}
}
return PaintRangePaintInfo(rangeItems, aSelection, nullptr, area, aPoint,
aScreenRect, aFlags);
}
void
PresShell::AddPrintPreviewBackgroundItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds)
{
aList.AppendNewToBottom(new (&aBuilder)
nsDisplaySolidColor(&aBuilder, aFrame, aBounds, NS_RGB(115, 115, 115)));
}
static bool
AddCanvasBackgroundColor(const nsDisplayList& aList, nsIFrame* aCanvasFrame,
nscolor aColor, bool aCSSBackgroundColor)
{
for (nsDisplayItem* i = aList.GetBottom(); i; i = i->GetAbove()) {
if (i->Frame() == aCanvasFrame &&
i->GetType() == nsDisplayItem::TYPE_CANVAS_BACKGROUND_COLOR) {
nsDisplayCanvasBackgroundColor* bg = static_cast<nsDisplayCanvasBackgroundColor*>(i);
bg->SetExtraBackgroundColor(aColor);
return true;
}
nsDisplayList* sublist = i->GetSameCoordinateSystemChildren();
if (sublist &&
!(i->GetType() == nsDisplayItem::TYPE_BLEND_CONTAINER && !aCSSBackgroundColor) &&
AddCanvasBackgroundColor(*sublist, aCanvasFrame, aColor, aCSSBackgroundColor))
return true;
}
return false;
}
void
PresShell::AddCanvasBackgroundColorItem(nsDisplayListBuilder& aBuilder,
nsDisplayList& aList,
nsIFrame* aFrame,
const nsRect& aBounds,
nscolor aBackstopColor,
uint32_t aFlags)
{
if (aBounds.IsEmpty()) {
return;
}
// We don't want to add an item for the canvas background color if the frame
// (sub)tree we are painting doesn't include any canvas frames. There isn't
// an easy way to check this directly, but if we check if the root of the
// (sub)tree we are painting is a canvas frame that should cover us in all
// cases (it will usually be a viewport frame when we have a canvas frame in
// the (sub)tree).
if (!(aFlags & nsIPresShell::FORCE_DRAW) &&
!nsCSSRendering::IsCanvasFrame(aFrame)) {
return;
}
nscolor bgcolor = NS_ComposeColors(aBackstopColor, mCanvasBackgroundColor);
if (NS_GET_A(bgcolor) == 0)
return;
// To make layers work better, we want to avoid having a big non-scrolled
// color background behind a scrolled transparent background. Instead,
// we'll try to move the color background into the scrolled content
// by making nsDisplayCanvasBackground paint it.
if (!aFrame->GetParent()) {
nsIScrollableFrame* sf =
aFrame->PresContext()->PresShell()->GetRootScrollFrameAsScrollable();
if (sf) {
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame && canvasFrame->IsVisibleForPainting(&aBuilder)) {
if (AddCanvasBackgroundColor(aList, canvasFrame, bgcolor, mHasCSSBackgroundColor))
return;
}
}
}
aList.AppendNewToBottom(
new (&aBuilder) nsDisplaySolidColor(&aBuilder, aFrame, aBounds, bgcolor));
}
static bool IsTransparentContainerElement(nsPresContext* aPresContext)
{
nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
if (!docShell) {
return false;
}
nsCOMPtr<nsPIDOMWindowOuter> pwin = docShell->GetWindow();
if (!pwin)
return false;
nsCOMPtr<Element> containerElement = pwin->GetFrameElementInternal();
return containerElement &&
containerElement->HasAttr(kNameSpaceID_None, nsGkAtoms::transparent);
}
nscolor PresShell::GetDefaultBackgroundColorToDraw()
{
if (!mPresContext || !mPresContext->GetBackgroundColorDraw()) {
return NS_RGB(255,255,255);
}
return mPresContext->DefaultBackgroundColor();
}
void PresShell::UpdateCanvasBackground()
{
// If we have a frame tree and it has style information that
// specifies the background color of the canvas, update our local
// cache of that color.
nsIFrame* rootStyleFrame = FrameConstructor()->GetRootElementStyleFrame();
if (rootStyleFrame) {
nsStyleContext* bgStyle =
nsCSSRendering::FindRootFrameBackground(rootStyleFrame);
// XXX We should really be passing the canvasframe, not the root element
// style frame but we don't have access to the canvasframe here. It isn't
// a problem because only a few frames can return something other than true
// and none of them would be a canvas frame or root element style frame.
bool drawBackgroundImage;
bool drawBackgroundColor;
mCanvasBackgroundColor =
nsCSSRendering::DetermineBackgroundColor(mPresContext, bgStyle,
rootStyleFrame,
drawBackgroundImage,
drawBackgroundColor);
mHasCSSBackgroundColor = drawBackgroundColor;
if (GetPresContext()->IsCrossProcessRootContentDocument() &&
!IsTransparentContainerElement(mPresContext)) {
mCanvasBackgroundColor =
NS_ComposeColors(GetDefaultBackgroundColorToDraw(), mCanvasBackgroundColor);
}
}
// If the root element of the document (ie html) has style 'display: none'
// then the document's background color does not get drawn; cache the
// color we actually draw.
if (!FrameConstructor()->GetRootElementFrame()) {
mCanvasBackgroundColor = GetDefaultBackgroundColorToDraw();
}
}
nscolor PresShell::ComputeBackstopColor(nsView* aDisplayRoot)
{
nsIWidget* widget = aDisplayRoot->GetWidget();
if (widget && (widget->GetTransparencyMode() != eTransparencyOpaque ||
widget->WidgetPaintsBackground())) {
// Within a transparent widget, so the backstop color must be
// totally transparent.
return NS_RGBA(0,0,0,0);
}
// Within an opaque widget (or no widget at all), so the backstop
// color must be totally opaque. The user's default background
// as reported by the prescontext is guaranteed to be opaque.
return GetDefaultBackgroundColorToDraw();
}
struct PaintParams {
nscolor mBackgroundColor;
};
LayerManager* PresShell::GetLayerManager()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->GetLayerManager();
}
}
return nullptr;
}
bool PresShell::AsyncPanZoomEnabled()
{
NS_ASSERTION(mViewManager, "Should have view manager");
nsView* rootView = mViewManager->GetRootView();
if (rootView) {
if (nsIWidget* widget = rootView->GetWidget()) {
return widget->AsyncPanZoomEnabled();
}
}
return gfxPlatform::AsyncPanZoomEnabled();
}
void PresShell::SetIgnoreViewportScrolling(bool aIgnore)
{
if (IgnoringViewportScrolling() == aIgnore) {
return;
}
RenderingState state(this);
state.mRenderFlags = ChangeFlag(state.mRenderFlags, aIgnore,
STATE_IGNORING_VIEWPORT_SCROLLING);
SetRenderingState(state);
}
nsresult PresShell::SetResolutionImpl(float aResolution, bool aScaleToResolution)
{
if (!(aResolution > 0.0)) {
return NS_ERROR_ILLEGAL_VALUE;
}
if (aResolution == mResolution.valueOr(0.0)) {
MOZ_ASSERT(mResolution.isSome());
return NS_OK;
}
RenderingState state(this);
state.mResolution = Some(aResolution);
SetRenderingState(state);
mScaleToResolution = aScaleToResolution;
if (mMobileViewportManager) {
mMobileViewportManager->ResolutionUpdated();
}
return NS_OK;
}
bool PresShell::ScaleToResolution() const
{
return mScaleToResolution;
}
float PresShell::GetCumulativeResolution()
{
float resolution = GetResolution();
nsPresContext* parentCtx = GetPresContext()->GetParentPresContext();
if (parentCtx) {
resolution *= parentCtx->PresShell()->GetCumulativeResolution();
}
return resolution;
}
float PresShell::GetCumulativeNonRootScaleResolution()
{
float resolution = 1.0;
nsIPresShell* currentShell = this;
while (currentShell) {
nsPresContext* currentCtx = currentShell->GetPresContext();
if (currentCtx != currentCtx->GetRootPresContext()) {
resolution *= currentShell->ScaleToResolution() ? currentShell->GetResolution() : 1.0f;
}
nsPresContext* parentCtx = currentCtx->GetParentPresContext();
if (parentCtx) {
currentShell = parentCtx->PresShell();
} else {
currentShell = nullptr;
}
}
return resolution;
}
void PresShell::SetRenderingState(const RenderingState& aState)
{
if (mRenderFlags != aState.mRenderFlags) {
// Rendering state changed in a way that forces us to flush any
// retained layers we might already have.
LayerManager* manager = GetLayerManager();
if (manager) {
FrameLayerBuilder::InvalidateAllLayers(manager);
}
}
mRenderFlags = aState.mRenderFlags;
mResolution = aState.mResolution;
}
void PresShell::SynthesizeMouseMove(bool aFromScroll)
{
if (!sSynthMouseMove)
return;
if (mPaintingSuppressed || !mIsActive || !mPresContext) {
return;
}
if (!mPresContext->IsRoot()) {
nsIPresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->SynthesizeMouseMove(aFromScroll);
}
return;
}
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE))
return;
if (!mSynthMouseMoveEvent.IsPending()) {
RefPtr<nsSynthMouseMoveEvent> ev =
new nsSynthMouseMoveEvent(this, aFromScroll);
if (!GetPresContext()->RefreshDriver()->AddRefreshObserver(ev,
Flush_Display)) {
NS_WARNING("failed to dispatch nsSynthMouseMoveEvent");
return;
}
mSynthMouseMoveEvent = ev;
}
}
/**
* Find the first floating view with a widget in a postorder traversal of the
* view tree that contains the point. Thus more deeply nested floating views
* are preferred over their ancestors, and floating views earlier in the
* view hierarchy (i.e., added later) are preferred over their siblings.
* This is adequate for finding the "topmost" floating view under a point,
* given that floating views don't supporting having a specific z-index.
*
* We cannot exit early when aPt is outside the view bounds, because floating
* views aren't necessarily included in their parent's bounds, so this could
* traverse the entire view hierarchy --- use carefully.
*/
static nsView* FindFloatingViewContaining(nsView* aView, nsPoint aPt)
{
if (aView->GetVisibility() == nsViewVisibility_kHide)
// No need to look into descendants.
return nullptr;
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindFloatingViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
if (aView->GetFloating() && aView->HasWidget() &&
aView->GetDimensions().Contains(aPt))
return aView;
return nullptr;
}
/*
* This finds the first view containing the given point in a postorder
* traversal of the view tree that contains the point, assuming that the
* point is not in a floating view. It assumes that only floating views
* extend outside the bounds of their parents.
*
* This methods should only be called if FindFloatingViewContaining
* returns null.
*/
static nsView* FindViewContaining(nsView* aView, nsPoint aPt)
{
if (!aView->GetDimensions().Contains(aPt) ||
aView->GetVisibility() == nsViewVisibility_kHide) {
return nullptr;
}
nsIFrame* frame = aView->GetFrame();
if (frame) {
if (!frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) ||
!frame->PresContext()->PresShell()->IsActive()) {
return nullptr;
}
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
nsView* r = FindViewContaining(v, v->ConvertFromParentCoords(aPt));
if (r)
return r;
}
return aView;
}
void
PresShell::ProcessSynthMouseMoveEvent(bool aFromScroll)
{
// If drag session has started, we shouldn't synthesize mousemove event.
nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
if (dragSession) {
mSynthMouseMoveEvent.Forget();
return;
}
// allow new event to be posted while handling this one only if the
// source of the event is a scroll (to prevent infinite reflow loops)
if (aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
nsView* rootView = mViewManager ? mViewManager->GetRootView() : nullptr;
if (mMouseLocation == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) ||
!rootView || !rootView->HasWidget() || !mPresContext) {
mSynthMouseMoveEvent.Forget();
return;
}
NS_ASSERTION(mPresContext->IsRoot(), "Only a root pres shell should be here");
// Hold a ref to ourselves so DispatchEvent won't destroy us (since
// we need to access members after we call DispatchEvent).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]synthesizing mouse move to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
int32_t APD = mPresContext->AppUnitsPerDevPixel();
// We need a widget to put in the event we are going to dispatch so we look
// for a view that has a widget and the mouse location is over. We first look
// for floating views, if there isn't one we use the root view. |view| holds
// that view.
nsView* view = nullptr;
// The appunits per devpixel ratio of |view|.
int32_t viewAPD;
// refPoint will be mMouseLocation relative to the widget of |view|, the
// widget we will put in the event we dispatch, in viewAPD appunits
nsPoint refpoint(0, 0);
// We always dispatch the event to the pres shell that contains the view that
// the mouse is over. pointVM is the VM of that pres shell.
nsViewManager *pointVM = nullptr;
// This could be a bit slow (traverses entire view hierarchy)
// but it's OK to do it once per synthetic mouse event
view = FindFloatingViewContaining(rootView, mMouseLocation);
if (!view) {
view = rootView;
nsView *pointView = FindViewContaining(rootView, mMouseLocation);
// pointView can be null in situations related to mouse capture
pointVM = (pointView ? pointView : view)->GetViewManager();
refpoint = mMouseLocation + rootView->ViewToWidgetOffset();
viewAPD = APD;
} else {
pointVM = view->GetViewManager();
nsIFrame* frame = view->GetFrame();
NS_ASSERTION(frame, "floating views can't be anonymous");
viewAPD = frame->PresContext()->AppUnitsPerDevPixel();
refpoint = mMouseLocation.ScaleToOtherAppUnits(APD, viewAPD);
refpoint -= view->GetOffsetTo(rootView);
refpoint += view->ViewToWidgetOffset();
}
NS_ASSERTION(view->GetWidget(), "view should have a widget here");
WidgetMouseEvent event(true, eMouseMove, view->GetWidget(),
WidgetMouseEvent::eSynthesized);
event.refPoint = LayoutDeviceIntPoint::FromAppUnitsToNearest(refpoint, viewAPD);
event.time = PR_IntervalNow();
// XXX set event.modifiers ?
// XXX mnakano I think that we should get the latest information from widget.
nsCOMPtr<nsIPresShell> shell = pointVM->GetPresShell();
if (shell) {
// Since this gets run in a refresh tick there isn't an InputAPZContext on
// the stack from the nsBaseWidget. We need to simulate one with at least
// the correct target guid, so that the correct callback transform gets
// applied if this event goes to a child process. The input block id is set
// to 0 because this is a synthetic event which doesn't really belong to any
// input block. Same for the APZ response field.
InputAPZContext apzContext(mMouseEventTargetGuid, 0, nsEventStatus_eIgnore);
shell->DispatchSynthMouseMove(&event, !aFromScroll);
}
if (!aFromScroll) {
mSynthMouseMoveEvent.Forget();
}
}
static void
AddFrameToVisibleRegions(nsIFrame* aFrame,
nsViewManager* aViewManager,
Maybe<VisibleRegions>& aVisibleRegions)
{
if (!aVisibleRegions) {
return;
}
MOZ_ASSERT(aFrame);
MOZ_ASSERT(aViewManager);
// Retrieve the view ID for this frame (which we obtain from the enclosing
// scrollable frame).
nsIScrollableFrame* scrollableFrame =
nsLayoutUtils::GetNearestScrollableFrame(aFrame,
nsLayoutUtils::SCROLLABLE_ONLY_ASYNC_SCROLLABLE |
nsLayoutUtils::SCROLLABLE_ALWAYS_MATCH_ROOT);
if (!scrollableFrame) {
return;
}
nsIFrame* scrollableFrameAsFrame = do_QueryFrame(scrollableFrame);
MOZ_ASSERT(scrollableFrameAsFrame);
nsIContent* scrollableFrameContent = scrollableFrameAsFrame->GetContent();
if (!scrollableFrameContent) {
return;
}
ViewID viewID;
if (!nsLayoutUtils::FindIDFor(scrollableFrameContent, &viewID)) {
return ;
}
// Update the visible region for the appropriate view ID.
nsRect frameRectInScrolledFrameSpace = aFrame->GetVisualOverflowRect();
nsLayoutUtils::TransformResult result =
nsLayoutUtils::TransformRect(aFrame,
scrollableFrame->GetScrolledFrame(),
frameRectInScrolledFrameSpace);
if (result != nsLayoutUtils::TransformResult::TRANSFORM_SUCCEEDED) {
return;
}
CSSIntRegion* regionForView = aVisibleRegions->LookupOrAdd(viewID);
MOZ_ASSERT(regionForView);
regionForView->OrWith(CSSPixel::FromAppUnitsRounded(frameRectInScrolledFrameSpace));
}
/* static */ void
PresShell::MarkImagesInListVisible(const nsDisplayList& aList,
Maybe<VisibleRegions>& aVisibleRegions)
{
for (nsDisplayItem* item = aList.GetBottom(); item; item = item->GetAbove()) {
nsDisplayList* sublist = item->GetChildren();
if (sublist) {
MarkImagesInListVisible(*sublist, aVisibleRegions);
continue;
}
nsIFrame* f = item->Frame();
// We could check the type of the display item, only a handful can hold an
// image loading content.
// dont bother nscomptr here, it is wasteful
nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(f->GetContent()));
if (content) {
// use the presshell containing the image
PresShell* presShell = static_cast<PresShell*>(f->PresContext()->PresShell());
uint32_t count = presShell->mVisibleImages.Count();
presShell->mVisibleImages.PutEntry(content);
if (presShell->mVisibleImages.Count() > count) {
// content was added to mVisibleImages, so we need to increment its visible count
content->IncrementVisibleCount();
}
AddFrameToVisibleRegions(f, presShell->mViewManager, aVisibleRegions);
}
}
}
void
PresShell::ReportAnyBadState()
{
if (!NS_IsMainThread()) {
gfxCriticalNote << "Got null image in image visibility: off-main-thread";
}
if (mIsZombie) {
gfxCriticalNote << "Got null image in image visibility: mIsZombie";
}
if (mIsDestroying) {
gfxCriticalNote << "Got null image in image visibility: mIsDestroying";
}
if (mIsReflowing) {
gfxCriticalNote << "Got null image in image visibility: mIsReflowing";
}
if (mPaintingIsFrozen) {
gfxCriticalNote << "Got null image in image visibility: mPaintingIsFrozen";
}
if (mForwardingContainer) {
gfxCriticalNote << "Got null image in image visibility: mForwardingContainer";
}
if (mIsNeverPainting) {
gfxCriticalNote << "Got null image in image visibility: mIsNeverPainting";
}
if (mIsDocumentGone) {
gfxCriticalNote << "Got null image in image visibility: mIsDocumentGone";
}
if (!nsContentUtils::IsSafeToRunScript()) {
gfxCriticalNote << "Got null image in image visibility: not safe to run script";
}
}
void
PresShell::SetInImageVisibility(bool aState)
{
mInImageVisibility = aState;
}
static void
DecrementVisibleCount(nsTHashtable<nsRefPtrHashKey<nsIImageLoadingContent>>& aImages,
uint32_t aNonvisibleAction, PresShell* aPresShell)
{
for (auto iter = aImages.Iter(); !iter.Done(); iter.Next()) {
if (MOZ_UNLIKELY(!iter.Get()->GetKey())) {
// We are about to crash, annotate crash report with some info that might
// help debug the crash (bug 1251150)
aPresShell->ReportAnyBadState();
}
aPresShell->SetInImageVisibility(true);
iter.Get()->GetKey()->DecrementVisibleCount(aNonvisibleAction);
aPresShell->SetInImageVisibility(false);
}
}
static void
NotifyCompositorOfVisibleRegionsChange(PresShell* aPresShell,
const Maybe<VisibleRegions>& aRegions)
{
if (!aRegions) {
return;
}
MOZ_ASSERT(aPresShell);
// Retrieve the layers ID and pres shell ID.
TabChild* tabChild = TabChild::GetFrom(aPresShell);
if (!tabChild) {
return;
}
const uint64_t layersId = tabChild->LayersId();
const uint32_t presShellId = aPresShell->GetPresShellId();
// Retrieve the CompositorBridgeChild.
LayerManager* layerManager = aPresShell->GetLayerManager();
if (!layerManager) {
return;
}
ClientLayerManager* clientLayerManager = layerManager->AsClientLayerManager();
if (!clientLayerManager) {
return;
}
CompositorBridgeChild* compositorChild = clientLayerManager->GetCompositorBridgeChild();
if (!compositorChild) {
return;
}
// Clear the old approximately visible regions associated with this document.
compositorChild->SendClearApproximatelyVisibleRegions(layersId, presShellId);
// Send the new approximately visible regions to the compositor.
for (auto iter = aRegions->ConstIter(); !iter.Done(); iter.Next()) {
const ViewID viewId = iter.Key();
const CSSIntRegion* region = iter.UserData();
MOZ_ASSERT(region);
const ScrollableLayerGuid guid(layersId, presShellId, viewId);
compositorChild->SendNotifyApproximatelyVisibleRegion(guid, *region);
}
}
void
PresShell::RebuildImageVisibilityDisplayList(const nsDisplayList& aList)
{
MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
mImageVisibilityVisited = true;
// Remove the entries of the mVisibleImages hashtable and put them in
// oldVisibleImages.
nsTHashtable< nsRefPtrHashKey<nsIImageLoadingContent> > oldVisibleImages;
mVisibleImages.SwapElements(oldVisibleImages);
// If we're visualizing visible regions, create a VisibleRegions object to
// store information about them. The functions we call will populate this
// object and send it to the compositor only if it's Some(), so we don't
// need to check the prefs everywhere.
Maybe<VisibleRegions> visibleRegions;
if (gfxPrefs::APZMinimap() && gfxPrefs::APZMinimapVisibilityEnabled()) {
visibleRegions.emplace();
}
MarkImagesInListVisible(aList, visibleRegions);
DecrementVisibleCount(oldVisibleImages,
nsIImageLoadingContent::ON_NONVISIBLE_NO_ACTION, this);
NotifyCompositorOfVisibleRegionsChange(this, visibleRegions);
}
/* static */ void
PresShell::ClearImageVisibilityVisited(nsView* aView, bool aClear)
{
nsViewManager* vm = aView->GetViewManager();
if (aClear) {
PresShell* presShell = static_cast<PresShell*>(vm->GetPresShell());
if (!presShell->mImageVisibilityVisited) {
presShell->ClearVisibleImagesList(
nsIImageLoadingContent::ON_NONVISIBLE_NO_ACTION);
}
presShell->mImageVisibilityVisited = false;
}
for (nsView* v = aView->GetFirstChild(); v; v = v->GetNextSibling()) {
ClearImageVisibilityVisited(v, v->GetViewManager() != vm);
}
}
void
PresShell::ClearVisibleImagesList(uint32_t aNonvisibleAction)
{
if (mInImageVisibility) {
gfxCriticalNoteOnce << "ClearVisibleImagesList is re-entering on "
<< (NS_IsMainThread() ? "" : "non-") << "main thread";
}
DecrementVisibleCount(mVisibleImages, aNonvisibleAction, this);
mVisibleImages.Clear();
}
void
PresShell::MarkImagesInSubtreeVisible(nsIFrame* aFrame,
const nsRect& aRect,
Maybe<VisibleRegions>& aVisibleRegions,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(aFrame->PresContext()->PresShell() == this, "wrong presshell");
nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(aFrame->GetContent()));
if (content && aFrame->StyleVisibility()->IsVisible() &&
(!aRemoveOnly || content->GetVisibleCount() > 0)) {
uint32_t count = mVisibleImages.Count();
mVisibleImages.PutEntry(content);
if (mVisibleImages.Count() > count) {
// content was added to mVisibleImages, so we need to increment its visible count
content->IncrementVisibleCount();
}
AddFrameToVisibleRegions(aFrame, mViewManager, aVisibleRegions);
}
nsSubDocumentFrame* subdocFrame = do_QueryFrame(aFrame);
if (subdocFrame) {
nsIPresShell* presShell = subdocFrame->GetSubdocumentPresShellForPainting(
nsSubDocumentFrame::IGNORE_PAINT_SUPPRESSION);
if (presShell) {
nsRect rect = aRect;
nsIFrame* root = presShell->GetRootFrame();
if (root) {
rect.MoveBy(aFrame->GetOffsetToCrossDoc(root));
} else {
rect.MoveBy(-aFrame->GetContentRectRelativeToSelf().TopLeft());
}
rect = rect.ScaleToOtherAppUnitsRoundOut(
aFrame->PresContext()->AppUnitsPerDevPixel(),
presShell->GetPresContext()->AppUnitsPerDevPixel());
presShell->RebuildImageVisibility(&rect);
}
return;
}
nsRect rect = aRect;
nsIScrollableFrame* scrollFrame = do_QueryFrame(aFrame);
if (scrollFrame) {
scrollFrame->NotifyImageVisibilityUpdate();
nsRect displayPort;
bool usingDisplayport =
nsLayoutUtils::GetDisplayPortForVisibilityTesting(
aFrame->GetContent(), &displayPort, RelativeTo::ScrollFrame);
if (usingDisplayport) {
rect = displayPort;
} else {
rect = rect.Intersect(scrollFrame->GetScrollPortRect());
}
rect = scrollFrame->ExpandRectToNearlyVisible(rect);
}
bool preserves3DChildren = aFrame->Extend3DContext();
// we assume all images in popups are visible elsewhere, so we skip them here
const nsIFrame::ChildListIDs skip(nsIFrame::kPopupList |
nsIFrame::kSelectPopupList);
for (nsIFrame::ChildListIterator childLists(aFrame);
!childLists.IsDone(); childLists.Next()) {
if (skip.Contains(childLists.CurrentID())) {
continue;
}
for (nsIFrame* child : childLists.CurrentList()) {
nsRect r = rect - child->GetPosition();
if (!r.IntersectRect(r, child->GetVisualOverflowRect())) {
continue;
}
if (child->IsTransformed()) {
// for children of a preserve3d element we just pass down the same dirty rect
if (!preserves3DChildren || !child->Combines3DTransformWithAncestors()) {
const nsRect overflow = child->GetVisualOverflowRectRelativeToSelf();
nsRect out;
if (nsDisplayTransform::UntransformRect(r, overflow, child, nsPoint(0,0), &out)) {
r = out;
} else {
r.SetEmpty();
}
}
}
MarkImagesInSubtreeVisible(child, r, aVisibleRegions);
}
}
}
void
PresShell::RebuildImageVisibility(nsRect* aRect,
bool aRemoveOnly /* = false */)
{
MOZ_ASSERT(!mImageVisibilityVisited, "already visited?");
mImageVisibilityVisited = true;
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
return;
}
if (mInImageVisibility) {
gfxCriticalNoteOnce << "RebuildImageVisibility is re-entering on "
<< (NS_IsMainThread() ? "" : "non-") << "main thread";
}
// Remove the entries of the mVisibleImages hashtable and put them in
// oldVisibleImages.
nsTHashtable< nsRefPtrHashKey<nsIImageLoadingContent> > oldVisibleImages;
mVisibleImages.SwapElements(oldVisibleImages);
// If we're visualizing visible regions, create a VisibleRegions object to
// store information about them. The functions we call will populate this
// object and send it to the compositor only if it's Some(), so we don't
// need to check the prefs everywhere.
Maybe<VisibleRegions> visibleRegions;
if (gfxPrefs::APZMinimap() && gfxPrefs::APZMinimapVisibilityEnabled()) {
visibleRegions.emplace();
}
nsRect vis(nsPoint(0, 0), rootFrame->GetSize());
if (aRect) {
vis = *aRect;
}
MarkImagesInSubtreeVisible(rootFrame, vis, visibleRegions, aRemoveOnly);
DecrementVisibleCount(oldVisibleImages,
nsIImageLoadingContent::ON_NONVISIBLE_NO_ACTION, this);
NotifyCompositorOfVisibleRegionsChange(this, visibleRegions);
}
void
PresShell::UpdateImageVisibility()
{
DoUpdateImageVisibility(/* aRemoveOnly = */ false);
}
void
PresShell::DoUpdateImageVisibility(bool aRemoveOnly)
{
MOZ_ASSERT(!mPresContext || mPresContext->IsRootContentDocument(),
"updating image visibility on a non-root content document?");
mUpdateImageVisibilityEvent.Revoke();
if (mHaveShutDown || mIsDestroying) {
return;
}
// call update on that frame
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
ClearVisibleImagesList(
nsIImageLoadingContent::ON_NONVISIBLE_REQUEST_DISCARD);
return;
}
RebuildImageVisibility(/* aRect = */ nullptr, aRemoveOnly);
ClearImageVisibilityVisited(rootFrame->GetView(), true);
#ifdef DEBUG_IMAGE_VISIBILITY_DISPLAY_LIST
// This can be used to debug the frame walker by comparing beforeImageList and
// mVisibleImages in RebuildImageVisibilityDisplayList to see if they produce
// the same results (mVisibleImages holds the images the display list thinks
// are visible, beforeImageList holds the images the frame walker thinks are
// visible).
nsDisplayListBuilder builder(rootFrame, nsDisplayListBuilder::IMAGE_VISIBILITY, false);
nsRect updateRect(nsPoint(0, 0), rootFrame->GetSize());
nsIFrame* rootScroll = GetRootScrollFrame();
if (rootScroll) {
nsIContent* content = rootScroll->GetContent();
if (content) {
Unused << nsLayoutUtils::GetDisplayPortForVisibilityTesting(content, &updateRect,
RelativeTo::ScrollFrame);
}
if (IgnoringViewportScrolling()) {
builder.SetIgnoreScrollFrame(rootScroll);
}
}
builder.IgnorePaintSuppression();
builder.EnterPresShell(rootFrame, updateRect);
nsDisplayList list;
rootFrame->BuildDisplayListForStackingContext(&builder, updateRect, &list);
builder.LeavePresShell(rootFrame, updateRect);
RebuildImageVisibilityDisplayList(list);
ClearImageVisibilityVisited(rootFrame->GetView(), true);
list.DeleteAll();
#endif
}
bool
PresShell::AssumeAllImagesVisible()
{
static bool sImageVisibilityEnabled = true;
static bool sImageVisibilityPrefCached = false;
if (!sImageVisibilityPrefCached) {
Preferences::AddBoolVarCache(&sImageVisibilityEnabled,
"layout.imagevisibility.enabled", true);
sImageVisibilityPrefCached = true;
}
if (!sImageVisibilityEnabled || !mPresContext || !mDocument) {
return true;
}
// We assume all images are visible in print, print preview, chrome, xul, and
// resource docs and don't keep track of them.
if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
mPresContext->Type() == nsPresContext::eContext_Print ||
mPresContext->IsChrome() ||
mDocument->IsResourceDoc() ||
mDocument->IsXULDocument()) {
return true;
}
return false;
}
void
PresShell::ScheduleImageVisibilityUpdate()
{
if (AssumeAllImagesVisible())
return;
if (!mPresContext->IsRootContentDocument()) {
nsPresContext* presContext = mPresContext->GetToplevelContentDocumentPresContext();
if (!presContext)
return;
MOZ_ASSERT(presContext->IsRootContentDocument(),
"Didn't get a root prescontext from GetToplevelContentDocumentPresContext?");
presContext->PresShell()->ScheduleImageVisibilityUpdate();
return;
}
if (mHaveShutDown || mIsDestroying)
return;
if (mUpdateImageVisibilityEvent.IsPending())
return;
RefPtr<nsRunnableMethod<PresShell> > ev =
NS_NewRunnableMethod(this, &PresShell::UpdateImageVisibility);
if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
mUpdateImageVisibilityEvent = ev;
}
}
void
PresShell::EnsureImageInVisibleList(nsIImageLoadingContent* aImage)
{
if (AssumeAllImagesVisible()) {
aImage->IncrementVisibleCount();
return;
}
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (mInImageVisibility) {
gfxCriticalNoteOnce << "EnsureImageInVisibleList is re-entering on "
<< (NS_IsMainThread() ? "" : "non-") << "main thread";
}
if (!mVisibleImages.Contains(aImage)) {
mVisibleImages.PutEntry(aImage);
aImage->IncrementVisibleCount();
}
}
void
PresShell::RemoveImageFromVisibleList(nsIImageLoadingContent* aImage)
{
#ifdef DEBUG
// if it has a frame make sure its in this presshell
nsCOMPtr<nsIContent> content = do_QueryInterface(aImage);
if (content) {
PresShell* shell = static_cast<PresShell*>(content->OwnerDoc()->GetShell());
MOZ_ASSERT(!shell || shell == this, "wrong shell");
}
#endif
if (AssumeAllImagesVisible()) {
MOZ_ASSERT(mVisibleImages.Count() == 0, "shouldn't have any images in the table");
return;
}
if (mInImageVisibility) {
gfxCriticalNoteOnce << "RemoveImageFromVisibleList is re-entering on "
<< (NS_IsMainThread() ? "" : "non-") << "main thread";
}
uint32_t count = mVisibleImages.Count();
mVisibleImages.RemoveEntry(aImage);
if (mVisibleImages.Count() < count) {
// aImage was in the hashtable, so we need to decrement its visible count
aImage->DecrementVisibleCount(
nsIImageLoadingContent::ON_NONVISIBLE_NO_ACTION);
}
}
class nsAutoNotifyDidPaint
{
public:
nsAutoNotifyDidPaint(PresShell* aShell, uint32_t aFlags)
: mShell(aShell), mFlags(aFlags)
{
}
~nsAutoNotifyDidPaint()
{
mShell->GetPresContext()->NotifyDidPaintForSubtree(mFlags);
}
private:
PresShell* mShell;
uint32_t mFlags;
};
class AutoUpdateHitRegion
{
public:
AutoUpdateHitRegion(PresShell* aShell, nsIFrame* aFrame)
: mShell(aShell), mFrame(aFrame)
{
}
~AutoUpdateHitRegion()
{
if (!XRE_IsContentProcess() ||
!mFrame || !mShell) {
return;
}
TabChild* tabChild = TabChild::GetFrom(mShell);
if (!tabChild || !tabChild->GetUpdateHitRegion()) {
return;
}
nsRegion region;
nsDisplayListBuilder builder(mFrame,
nsDisplayListBuilder::EVENT_DELIVERY,
/* aBuildCert= */ false);
nsDisplayList list;
AutoTArray<nsIFrame*, 100> outFrames;
nsDisplayItem::HitTestState hitTestState;
builder.EnterPresShell(mFrame);
nsRect bounds = mShell->GetPresContext()->GetVisibleArea();
mFrame->BuildDisplayListForStackingContext(&builder, bounds, &list);
builder.LeavePresShell(mFrame);
list.HitTest(&builder, bounds, &hitTestState, &outFrames);
list.DeleteAll();
for (int32_t i = outFrames.Length() - 1; i >= 0; --i) {
region.Or(region, nsLayoutUtils::TransformFrameRectToAncestor(
outFrames[i], nsRect(nsPoint(0, 0), outFrames[i]->GetSize()), mFrame));
}
tabChild->UpdateHitRegion(region);
}
private:
PresShell* mShell;
nsIFrame* mFrame;
};
void
PresShell::RecordShadowStyleChange(ShadowRoot* aShadowRoot)
{
mChangedScopeStyleRoots.AppendElement(aShadowRoot->GetHost()->AsElement());
}
void
PresShell::Paint(nsView* aViewToPaint,
const nsRegion& aDirtyRegion,
uint32_t aFlags)
{
PROFILER_LABEL("PresShell", "Paint",
js::ProfileEntry::Category::GRAPHICS);
NS_ASSERTION(!mIsDestroying, "painting a destroyed PresShell");
NS_ASSERTION(aViewToPaint, "null view");
MOZ_ASSERT(!mImageVisibilityVisited, "should have been cleared");
if (!mIsActive || mIsZombie) {
return;
}
nsPresContext* presContext = GetPresContext();
AUTO_LAYOUT_PHASE_ENTRY_POINT(presContext, Paint);
nsIFrame* frame = aViewToPaint->GetFrame();
bool isRetainingManager;
LayerManager* layerManager =
aViewToPaint->GetWidget()->GetLayerManager(&isRetainingManager);
NS_ASSERTION(layerManager, "Must be in paint event");
bool shouldInvalidate = layerManager->NeedsWidgetInvalidation();
nsAutoNotifyDidPaint notifyDidPaint(this, aFlags);
AutoUpdateHitRegion updateHitRegion(this, frame);
// Whether or not we should set first paint when painting is
// suppressed is debatable. For now we'll do it because
// B2G relies on first paint to configure the viewport and
// we only want to do that when we have real content to paint.
// See Bug 798245
if (mIsFirstPaint && !mPaintingSuppressed) {
#ifdef MOZ_WIDGET_ANDROID
__android_log_print(ANDROID_LOG_INFO, "GeckoBug1151102", "PresShell doing a first-paint");
#endif
layerManager->SetIsFirstPaint();
mIsFirstPaint = false;
}
layerManager->BeginTransaction();
if (frame && isRetainingManager) {
// Try to do an empty transaction, if the frame tree does not
// need to be updated. Do not try to do an empty transaction on
// a non-retained layer manager (like the BasicLayerManager that
// draws the window title bar on Mac), because a) it won't work
// and b) below we don't want to clear NS_FRAME_UPDATE_LAYER_TREE,
// that will cause us to forget to update the real layer manager!
if (!(aFlags & PAINT_LAYERS)) {
if (layerManager->EndEmptyTransaction()) {
return;
}
NS_WARNING("Must complete empty transaction when compositing!");
}
if (!(aFlags & PAINT_SYNC_DECODE_IMAGES) &&
!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
!mNextPaintCompressed) {
NotifySubDocInvalidationFunc computeInvalidFunc =
presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
bool computeInvalidRect = computeInvalidFunc ||
(layerManager->GetBackendType() == LayersBackend::LAYERS_BASIC);
UniquePtr<LayerProperties> props;
if (computeInvalidRect) {
props = Move(LayerProperties::CloneFrom(layerManager->GetRoot()));
}
MaybeSetupTransactionIdAllocator(layerManager, aViewToPaint);
if (layerManager->EndEmptyTransaction((aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE)) {
nsIntRegion invalid;
if (props) {
invalid = props->ComputeDifferences(layerManager->GetRoot(), computeInvalidFunc);
} else {
LayerProperties::ClearInvalidations(layerManager->GetRoot());
}
if (props) {
if (!invalid.IsEmpty()) {
nsIntRect bounds = invalid.GetBounds();
nsRect rect(presContext->DevPixelsToAppUnits(bounds.x),
presContext->DevPixelsToAppUnits(bounds.y),
presContext->DevPixelsToAppUnits(bounds.width),
presContext->DevPixelsToAppUnits(bounds.height));
if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateViewNoSuppression(aViewToPaint, rect);
}
presContext->NotifyInvalidation(bounds, 0);
}
} else if (shouldInvalidate) {
aViewToPaint->GetViewManager()->InvalidateView(aViewToPaint);
}
frame->UpdatePaintCountForPaintedPresShells();
return;
}
}
frame->RemoveStateBits(NS_FRAME_UPDATE_LAYER_TREE);
}
if (frame) {
frame->ClearPresShellsFromLastPaint();
}
nscolor bgcolor = ComputeBackstopColor(aViewToPaint);
uint32_t flags = nsLayoutUtils::PAINT_WIDGET_LAYERS | nsLayoutUtils::PAINT_EXISTING_TRANSACTION;
if (!(aFlags & PAINT_COMPOSITE)) {
flags |= nsLayoutUtils::PAINT_NO_COMPOSITE;
}
if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
}
if (mNextPaintCompressed) {
flags |= nsLayoutUtils::PAINT_COMPRESSED;
mNextPaintCompressed = false;
}
if (frame) {
// We can paint directly into the widget using its layer manager.
nsLayoutUtils::PaintFrame(nullptr, frame, aDirtyRegion, bgcolor, flags);
return;
}
RefPtr<ColorLayer> root = layerManager->CreateColorLayer();
if (root) {
nsPresContext* pc = GetPresContext();
nsIntRect bounds =
pc->GetVisibleArea().ToOutsidePixels(pc->AppUnitsPerDevPixel());
bgcolor = NS_ComposeColors(bgcolor, mCanvasBackgroundColor);
root->SetColor(Color::FromABGR(bgcolor));
root->SetVisibleRegion(LayerIntRegion::FromUnknownRegion(bounds));
layerManager->SetRoot(root);
}
MaybeSetupTransactionIdAllocator(layerManager, aViewToPaint);
layerManager->EndTransaction(nullptr, nullptr, (aFlags & PAINT_COMPOSITE) ?
LayerManager::END_DEFAULT : LayerManager::END_NO_COMPOSITE);
}
// static
void
nsIPresShell::SetCapturingContent(nsIContent* aContent, uint8_t aFlags)
{
// If capture was set for pointer lock, don't unlock unless we are coming
// out of pointer lock explicitly.
if (!aContent && gCaptureInfo.mPointerLock &&
!(aFlags & CAPTURE_POINTERLOCK)) {
return;
}
gCaptureInfo.mContent = nullptr;
// only set capturing content if allowed or the CAPTURE_IGNOREALLOWED or
// CAPTURE_POINTERLOCK flags are used.
if ((aFlags & CAPTURE_IGNOREALLOWED) || gCaptureInfo.mAllowed ||
(aFlags & CAPTURE_POINTERLOCK)) {
if (aContent) {
gCaptureInfo.mContent = aContent;
}
// CAPTURE_POINTERLOCK is the same as CAPTURE_RETARGETTOELEMENT & CAPTURE_IGNOREALLOWED
gCaptureInfo.mRetargetToElement = ((aFlags & CAPTURE_RETARGETTOELEMENT) != 0) ||
((aFlags & CAPTURE_POINTERLOCK) != 0);
gCaptureInfo.mPreventDrag = (aFlags & CAPTURE_PREVENTDRAG) != 0;
gCaptureInfo.mPointerLock = (aFlags & CAPTURE_POINTERLOCK) != 0;
}
}
class AsyncCheckPointerCaptureStateCaller : public nsRunnable
{
public:
explicit AsyncCheckPointerCaptureStateCaller(int32_t aPointerId)
: mPointerId(aPointerId) {}
NS_IMETHOD Run()
{
nsIPresShell::CheckPointerCaptureState(mPointerId);
return NS_OK;
}
private:
int32_t mPointerId;
};
/* static */ void
nsIPresShell::SetPointerCapturingContent(uint32_t aPointerId, nsIContent* aContent)
{
PointerCaptureInfo* pointerCaptureInfo = nullptr;
gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo);
nsIContent* content = pointerCaptureInfo ? pointerCaptureInfo->mOverrideContent : nullptr;
if (!content && (nsIDOMMouseEvent::MOZ_SOURCE_MOUSE == GetPointerType(aPointerId))) {
SetCapturingContent(aContent, CAPTURE_PREVENTDRAG);
}
if (pointerCaptureInfo) {
pointerCaptureInfo->mPendingContent = aContent;
} else {
gPointerCaptureList->Put(aPointerId,
new PointerCaptureInfo(aContent, GetPointerPrimaryState(aPointerId)));
}
}
/* static */ void
nsIPresShell::ReleasePointerCapturingContent(uint32_t aPointerId)
{
if (gActivePointersIds->Get(aPointerId)) {
SetCapturingContent(nullptr, CAPTURE_PREVENTDRAG);
}
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// Set flag to asyncronously release capture for given pointer.
pointerCaptureInfo->mReleaseContent = true;
RefPtr<AsyncCheckPointerCaptureStateCaller> asyncCaller =
new AsyncCheckPointerCaptureStateCaller(aPointerId);
NS_DispatchToCurrentThread(asyncCaller);
}
}
/* static */ nsIContent*
nsIPresShell::GetPointerCapturingContent(uint32_t aPointerId)
{
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
return pointerCaptureInfo->mOverrideContent;
}
return nullptr;
}
/* static */ bool
nsIPresShell::CheckPointerCaptureState(uint32_t aPointerId)
{
bool didDispatchEvent = false;
PointerCaptureInfo* pointerCaptureInfo = nullptr;
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// If pendingContent exist or anybody calls element.releasePointerCapture
// we should dispatch lostpointercapture event to overrideContent if it exist
if (pointerCaptureInfo->mPendingContent || pointerCaptureInfo->mReleaseContent) {
if (pointerCaptureInfo->mOverrideContent) {
uint16_t pointerType = GetPointerType(aPointerId);
bool isPrimary = pointerCaptureInfo->mPrimaryState;
nsCOMPtr<nsIContent> content;
pointerCaptureInfo->mOverrideContent.swap(content);
if (pointerCaptureInfo->mReleaseContent) {
pointerCaptureInfo->mPendingContent = nullptr;
}
if (pointerCaptureInfo->Empty()) {
gPointerCaptureList->Remove(aPointerId);
}
DispatchGotOrLostPointerCaptureEvent(false, aPointerId, pointerType, isPrimary, content);
didDispatchEvent = true;
} else if (pointerCaptureInfo->mPendingContent && pointerCaptureInfo->mReleaseContent) {
// If anybody calls element.releasePointerCapture
// We should clear overrideContent and pendingContent
pointerCaptureInfo->mPendingContent = nullptr;
pointerCaptureInfo->mReleaseContent = false;
}
}
}
if (gPointerCaptureList->Get(aPointerId, &pointerCaptureInfo) && pointerCaptureInfo) {
// If pendingContent exist we should dispatch gotpointercapture event to it
if (pointerCaptureInfo && pointerCaptureInfo->mPendingContent) {
pointerCaptureInfo->mOverrideContent = pointerCaptureInfo->mPendingContent;
pointerCaptureInfo->mPendingContent = nullptr;
pointerCaptureInfo->mReleaseContent = false;
DispatchGotOrLostPointerCaptureEvent(true, aPointerId,
GetPointerType(aPointerId),
pointerCaptureInfo->mPrimaryState,
pointerCaptureInfo->mOverrideContent);
didDispatchEvent = true;
}
}
return didDispatchEvent;
}
/* static */ uint16_t
nsIPresShell::GetPointerType(uint32_t aPointerId)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
return pointerInfo->mPointerType;
}
return nsIDOMMouseEvent::MOZ_SOURCE_UNKNOWN;
}
/* static */ bool
nsIPresShell::GetPointerPrimaryState(uint32_t aPointerId)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
return pointerInfo->mPrimaryState;
}
return false;
}
/* static */ bool
nsIPresShell::GetPointerInfo(uint32_t aPointerId, bool& aActiveState)
{
PointerInfo* pointerInfo = nullptr;
if (gActivePointersIds->Get(aPointerId, &pointerInfo) && pointerInfo) {
aActiveState = pointerInfo->mActiveState;
return true;
}
return false;
}
void
PresShell::UpdateActivePointerState(WidgetGUIEvent* aEvent)
{
switch (aEvent->mMessage) {
case eMouseEnterIntoWidget:
// In this case we have to know information about available mouse pointers
if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
gActivePointersIds->Put(mouseEvent->pointerId,
new PointerInfo(false, mouseEvent->inputSource, true));
}
break;
case ePointerDown:
// In this case we switch pointer to active state
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
gActivePointersIds->Put(pointerEvent->pointerId,
new PointerInfo(true, pointerEvent->inputSource, pointerEvent->isPrimary));
}
break;
case ePointerUp:
// In this case we remove information about pointer or turn off active state
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
if(pointerEvent->inputSource != nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
gActivePointersIds->Put(pointerEvent->pointerId,
new PointerInfo(false, pointerEvent->inputSource, pointerEvent->isPrimary));
} else {
gActivePointersIds->Remove(pointerEvent->pointerId);
}
}
break;
case eMouseExitFromWidget:
// In this case we have to remove information about disappeared mouse pointers
if (WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
gActivePointersIds->Remove(mouseEvent->pointerId);
}
break;
default:
break;
}
}
nsIContent*
PresShell::GetCurrentEventContent()
{
if (mCurrentEventContent &&
mCurrentEventContent->GetCrossShadowCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
return mCurrentEventContent;
}
nsIFrame*
PresShell::GetCurrentEventFrame()
{
if (MOZ_UNLIKELY(mIsDestroying)) {
return nullptr;
}
// GetCurrentEventContent() makes sure the content is still in the
// same document that this pres shell belongs to. If not, then the
// frame shouldn't get an event, nor should we even assume its safe
// to try and find the frame.
nsIContent* content = GetCurrentEventContent();
if (!mCurrentEventFrame && content) {
mCurrentEventFrame = content->GetPrimaryFrame();
MOZ_ASSERT(!mCurrentEventFrame ||
mCurrentEventFrame->PresContext()->GetPresShell() == this);
}
return mCurrentEventFrame;
}
nsIFrame*
PresShell::GetEventTargetFrame()
{
return GetCurrentEventFrame();
}
already_AddRefed<nsIContent>
PresShell::GetEventTargetContent(WidgetEvent* aEvent)
{
nsCOMPtr<nsIContent> content = GetCurrentEventContent();
if (!content) {
nsIFrame* currentEventFrame = GetCurrentEventFrame();
if (currentEventFrame) {
currentEventFrame->GetContentForEvent(aEvent, getter_AddRefs(content));
NS_ASSERTION(!content || content->GetCrossShadowCurrentDoc() == mDocument,
"handing out content from a different doc");
}
}
return content.forget();
}
void
PresShell::PushCurrentEventInfo(nsIFrame* aFrame, nsIContent* aContent)
{
if (mCurrentEventFrame || mCurrentEventContent) {
mCurrentEventFrameStack.InsertElementAt(0, mCurrentEventFrame);
mCurrentEventContentStack.InsertObjectAt(mCurrentEventContent, 0);
}
mCurrentEventFrame = aFrame;
mCurrentEventContent = aContent;
}
void
PresShell::PopCurrentEventInfo()
{
mCurrentEventFrame = nullptr;
mCurrentEventContent = nullptr;
if (0 != mCurrentEventFrameStack.Length()) {
mCurrentEventFrame = mCurrentEventFrameStack.ElementAt(0);
mCurrentEventFrameStack.RemoveElementAt(0);
mCurrentEventContent = mCurrentEventContentStack.ObjectAt(0);
mCurrentEventContentStack.RemoveObjectAt(0);
// Don't use it if it has moved to a different document.
if (mCurrentEventContent &&
mCurrentEventContent->GetCrossShadowCurrentDoc() != mDocument) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
}
}
}
bool PresShell::InZombieDocument(nsIContent *aContent)
{
// If a content node points to a null document, or the document is not
// attached to a window, then it is possibly in a zombie document,
// about to be replaced by a newly loading document.
// Such documents cannot handle DOM events.
// It might actually be in a node not attached to any document,
// in which case there is not parent presshell to retarget it to.
nsIDocument* doc = aContent->GetComposedDoc();
return !doc || !doc->GetWindow();
}
already_AddRefed<nsPIDOMWindowOuter>
PresShell::GetRootWindow()
{
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
if (window) {
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = window->GetPrivateRoot();
NS_ASSERTION(rootWindow, "nsPIDOMWindow::GetPrivateRoot() returns NULL");
return rootWindow.forget();
}
// If we don't have DOM window, we're zombie, we should find the root window
// with our parent shell.
nsCOMPtr<nsIPresShell> parent = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parent, nullptr);
return parent->GetRootWindow();
}
already_AddRefed<nsIPresShell>
PresShell::GetParentPresShellForEventHandling()
{
NS_ENSURE_TRUE(mPresContext, nullptr);
// Now, find the parent pres shell and send the event there
nsCOMPtr<nsIDocShellTreeItem> treeItem = mPresContext->GetDocShell();
if (!treeItem) {
treeItem = mForwardingContainer.get();
}
// Might have gone away, or never been around to start with
NS_ENSURE_TRUE(treeItem, nullptr);
nsCOMPtr<nsIDocShellTreeItem> parentTreeItem;
treeItem->GetParent(getter_AddRefs(parentTreeItem));
nsCOMPtr<nsIDocShell> parentDocShell = do_QueryInterface(parentTreeItem);
NS_ENSURE_TRUE(parentDocShell && treeItem != parentTreeItem, nullptr);
nsCOMPtr<nsIPresShell> parentPresShell = parentDocShell->GetPresShell();
return parentPresShell.forget();
}
nsresult
PresShell::RetargetEventToParent(WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
// Send this events straight up to the parent pres shell.
// We do this for keystroke events in zombie documents or if either a frame
// or a root content is not present.
// That way at least the UI key bindings can work.
nsCOMPtr<nsIPresShell> kungFuDeathGrip(this);
nsCOMPtr<nsIPresShell> parentPresShell = GetParentPresShellForEventHandling();
NS_ENSURE_TRUE(parentPresShell, NS_ERROR_FAILURE);
// Fake the event as though it's from the parent pres shell's root frame.
return parentPresShell->HandleEvent(parentPresShell->GetRootFrame(), aEvent, true, aEventStatus);
}
void
PresShell::DisableNonTestMouseEvents(bool aDisable)
{
sDisableNonTestMouseEvents = aDisable;
}
already_AddRefed<nsPIDOMWindowOuter>
PresShell::GetFocusedDOMWindowInOurWindow()
{
nsCOMPtr<nsPIDOMWindowOuter> rootWindow = GetRootWindow();
NS_ENSURE_TRUE(rootWindow, nullptr);
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsFocusManager::GetFocusedDescendant(rootWindow, true,
getter_AddRefs(focusedWindow));
return focusedWindow.forget();
}
void
PresShell::RecordMouseLocation(WidgetGUIEvent* aEvent)
{
if (!mPresContext)
return;
if (!mPresContext->IsRoot()) {
PresShell* rootPresShell = GetRootPresShell();
if (rootPresShell) {
rootPresShell->RecordMouseLocation(aEvent);
}
return;
}
if ((aEvent->mMessage == eMouseMove &&
aEvent->AsMouseEvent()->reason == WidgetMouseEvent::eReal) ||
aEvent->mMessage == eMouseEnterIntoWidget ||
aEvent->mMessage == eMouseDown ||
aEvent->mMessage == eMouseUp) {
nsIFrame* rootFrame = GetRootFrame();
if (!rootFrame) {
nsView* rootView = mViewManager->GetRootView();
mMouseLocation = nsLayoutUtils::TranslateWidgetToView(mPresContext,
aEvent->widget, aEvent->refPoint, rootView);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
} else {
mMouseLocation =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, rootFrame);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
}
#ifdef DEBUG_MOUSE_LOCATION
if (aEvent->mMessage == eMouseEnterIntoWidget) {
printf("[ps=%p]got mouse enter for %p\n",
this, aEvent->widget);
}
printf("[ps=%p]setting mouse location to (%d,%d)\n",
this, mMouseLocation.x, mMouseLocation.y);
#endif
if (aEvent->mMessage == eMouseEnterIntoWidget) {
SynthesizeMouseMove(false);
}
} else if (aEvent->mMessage == eMouseExitFromWidget) {
// Although we only care about the mouse moving into an area for which this
// pres shell doesn't receive mouse move events, we don't check which widget
// the mouse exit was for since this seems to vary by platform. Hopefully
// this won't matter at all since we'll get the mouse move or enter after
// the mouse exit when the mouse moves from one of our widgets into another.
mMouseLocation = nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
mMouseEventTargetGuid = InputAPZContext::GetTargetLayerGuid();
#ifdef DEBUG_MOUSE_LOCATION
printf("[ps=%p]got mouse exit for %p\n",
this, aEvent->widget);
printf("[ps=%p]clearing mouse location\n",
this);
#endif
}
}
nsIFrame* GetNearestFrameContainingPresShell(nsIPresShell* aPresShell)
{
nsView* view = aPresShell->GetViewManager()->GetRootView();
while (view && !view->GetFrame()) {
view = view->GetParent();
}
nsIFrame* frame = nullptr;
if (view) {
frame = view->GetFrame();
}
return frame;
}
static bool
FlushThrottledStyles(nsIDocument *aDocument, void *aData)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell && shell->IsVisible()) {
nsPresContext* presContext = shell->GetPresContext();
if (presContext) {
if (presContext->RestyleManager()->IsGecko()) {
// XXX stylo: ServoRestyleManager doesn't support animations yet.
presContext->RestyleManager()->AsGecko()->UpdateOnlyAnimationStyles();
}
}
}
aDocument->EnumerateSubDocuments(FlushThrottledStyles, nullptr);
return true;
}
static nsresult
DispatchPointerFromMouseOrTouch(PresShell* aShell,
nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aStatus,
nsIContent** aTargetContent)
{
EventMessage pointerMessage = eVoidEvent;
if (aEvent->mClass == eMouseEventClass) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
// if it is not mouse then it is likely will come as touch event
if (!mouseEvent->convertToPointer) {
return NS_OK;
}
int16_t button = mouseEvent->button;
switch (mouseEvent->mMessage) {
case eMouseMove:
if (mouseEvent->buttons == 0) {
button = -1;
}
pointerMessage = ePointerMove;
break;
case eMouseUp:
pointerMessage = ePointerUp;
break;
case eMouseDown:
pointerMessage = ePointerDown;
break;
default:
return NS_OK;
}
WidgetPointerEvent event(*mouseEvent);
event.mMessage = pointerMessage;
event.button = button;
event.pressure = event.buttons ?
mouseEvent->pressure ? mouseEvent->pressure : 0.5f :
0.0f;
event.convertToPointer = mouseEvent->convertToPointer = false;
aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus, aTargetContent);
} else if (aEvent->mClass == eTouchEventClass) {
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch pointer events on each touch
// copy the event
switch (touchEvent->mMessage) {
case eTouchMove:
pointerMessage = ePointerMove;
break;
case eTouchEnd:
pointerMessage = ePointerUp;
break;
case eTouchStart:
pointerMessage = ePointerDown;
break;
case eTouchCancel:
pointerMessage = ePointerCancel;
break;
default:
return NS_OK;
}
for (uint32_t i = 0; i < touchEvent->touches.Length(); ++i) {
mozilla::dom::Touch* touch = touchEvent->touches[i];
if (!touch || !touch->convertToPointer) {
continue;
}
WidgetPointerEvent event(touchEvent->mFlags.mIsTrusted, pointerMessage, touchEvent->widget);
event.isPrimary = i == 0;
event.pointerId = touch->Identifier();
event.refPoint = touch->mRefPoint;
event.modifiers = touchEvent->modifiers;
event.width = touch->RadiusX();
event.height = touch->RadiusY();
event.tiltX = touch->tiltX;
event.tiltY = touch->tiltY;
event.time = touchEvent->time;
event.timeStamp = touchEvent->timeStamp;
event.mFlags = touchEvent->mFlags;
event.button = WidgetMouseEvent::eLeftButton;
event.buttons = WidgetMouseEvent::eLeftButtonFlag;
event.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
event.convertToPointer = touch->convertToPointer = false;
aShell->HandleEvent(aFrame, &event, aDontRetargetEvents, aStatus, aTargetContent);
}
}
return NS_OK;
}
class ReleasePointerCaptureCaller
{
public:
ReleasePointerCaptureCaller() :
mPointerId(0),
mIsSet(false)
{
}
~ReleasePointerCaptureCaller()
{
if (mIsSet) {
nsIPresShell::ReleasePointerCapturingContent(mPointerId);
}
}
void SetTarget(uint32_t aPointerId)
{
mPointerId = aPointerId;
mIsSet = true;
}
private:
int32_t mPointerId;
bool mIsSet;
};
static bool
CheckPermissionForBeforeAfterKeyboardEvent(Element* aElement)
{
// An element which is chrome-privileged should be able to handle before
// events and after events.
nsIPrincipal* principal = aElement->NodePrincipal();
if (nsContentUtils::IsSystemPrincipal(principal)) {
return true;
}
// An element which has "before-after-keyboard-event" permission should be
// able to handle before events and after events.
nsCOMPtr<nsIPermissionManager> permMgr = services::GetPermissionManager();
uint32_t permission = nsIPermissionManager::DENY_ACTION;
if (permMgr) {
permMgr->TestPermissionFromPrincipal(principal, "before-after-keyboard-event", &permission);
if (permission == nsIPermissionManager::ALLOW_ACTION) {
return true;
}
// Check "embed-apps" permission for later use.
permission = nsIPermissionManager::DENY_ACTION;
permMgr->TestPermissionFromPrincipal(principal, "embed-apps", &permission);
}
// An element can handle before events and after events if the following
// conditions are met:
// 1) <iframe mozbrowser mozapp>
// 2) it has "embed-apps" permission.
nsCOMPtr<nsIMozBrowserFrame> browserFrame(do_QueryInterface(aElement));
if ((permission == nsIPermissionManager::ALLOW_ACTION) &&
browserFrame && browserFrame->GetReallyIsApp()) {
return true;
}
return false;
}
static void
BuildTargetChainForBeforeAfterKeyboardEvent(nsINode* aTarget,
nsTArray<nsCOMPtr<Element> >& aChain,
bool& aTargetIsIframe)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aTarget));
aTargetIsIframe = content && content->IsHTMLElement(nsGkAtoms::iframe);
Element* frameElement;
// If event target is not an iframe, skip the event target and get its
// parent frame.
if (aTargetIsIframe) {
frameElement = aTarget->AsElement();
} else {
nsPIDOMWindowOuter* window = aTarget->OwnerDoc()->GetWindow();
frameElement = window ? window->GetFrameElementInternal() : nullptr;
}
// Check permission for all ancestors and add them into the target chain.
while (frameElement) {
if (CheckPermissionForBeforeAfterKeyboardEvent(frameElement)) {
aChain.AppendElement(frameElement);
}
nsPIDOMWindowOuter* window = frameElement->OwnerDoc()->GetWindow();
frameElement = window ? window->GetFrameElementInternal() : nullptr;
}
}
void
PresShell::DispatchBeforeKeyboardEventInternal(const nsTArray<nsCOMPtr<Element> >& aChain,
const WidgetKeyboardEvent& aEvent,
size_t& aChainIndex,
bool& aDefaultPrevented)
{
size_t length = aChain.Length();
if (!CanDispatchEvent(&aEvent) || !length) {
return;
}
EventMessage message =
(aEvent.mMessage == eKeyDown) ? eBeforeKeyDown : eBeforeKeyUp;
nsCOMPtr<EventTarget> eventTarget;
// Dispatch before events from the outermost element.
for (int32_t i = length - 1; i >= 0; i--) {
eventTarget = do_QueryInterface(aChain[i]->OwnerDoc()->GetWindow());
if (!eventTarget || !CanDispatchEvent(&aEvent)) {
return;
}
aChainIndex = i;
InternalBeforeAfterKeyboardEvent beforeEvent(aEvent.mFlags.mIsTrusted,
message, aEvent.widget);
beforeEvent.AssignBeforeAfterKeyEventData(aEvent, false);
EventDispatcher::Dispatch(eventTarget, mPresContext, &beforeEvent);
if (beforeEvent.mFlags.mDefaultPrevented) {
aDefaultPrevented = true;
return;
}
}
}
void
PresShell::DispatchAfterKeyboardEventInternal(const nsTArray<nsCOMPtr<Element> >& aChain,
const WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
size_t aStartOffset)
{
size_t length = aChain.Length();
if (!CanDispatchEvent(&aEvent) || !length) {
return;
}
EventMessage message =
(aEvent.mMessage == eKeyDown) ? eAfterKeyDown : eAfterKeyUp;
bool embeddedCancelled = aEmbeddedCancelled;
nsCOMPtr<EventTarget> eventTarget;
// Dispatch after events from the innermost element.
for (uint32_t i = aStartOffset; i < length; i++) {
eventTarget = do_QueryInterface(aChain[i]->OwnerDoc()->GetWindow());
if (!eventTarget || !CanDispatchEvent(&aEvent)) {
return;
}
InternalBeforeAfterKeyboardEvent afterEvent(aEvent.mFlags.mIsTrusted,
message, aEvent.widget);
afterEvent.AssignBeforeAfterKeyEventData(aEvent, false);
afterEvent.mEmbeddedCancelled.SetValue(embeddedCancelled);
EventDispatcher::Dispatch(eventTarget, mPresContext, &afterEvent);
embeddedCancelled = afterEvent.mFlags.mDefaultPrevented;
}
}
void
PresShell::DispatchAfterKeyboardEvent(nsINode* aTarget,
const WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled)
{
MOZ_ASSERT(aTarget);
MOZ_ASSERT(BeforeAfterKeyboardEventEnabled());
if (NS_WARN_IF(aEvent.mMessage != eKeyDown && aEvent.mMessage != eKeyUp)) {
return;
}
// Build up a target chain. Each item in the chain will receive an after event.
AutoTArray<nsCOMPtr<Element>, 5> chain;
bool targetIsIframe = false;
BuildTargetChainForBeforeAfterKeyboardEvent(aTarget, chain, targetIsIframe);
DispatchAfterKeyboardEventInternal(chain, aEvent, aEmbeddedCancelled);
}
bool
PresShell::CanDispatchEvent(const WidgetGUIEvent* aEvent) const
{
bool rv =
mPresContext && !mHaveShutDown && nsContentUtils::IsSafeToRunScript();
if (aEvent) {
rv &= (aEvent && aEvent->widget && !aEvent->widget->Destroyed());
}
return rv;
}
void
PresShell::HandleKeyboardEvent(nsINode* aTarget,
WidgetKeyboardEvent& aEvent,
bool aEmbeddedCancelled,
nsEventStatus* aStatus,
EventDispatchingCallback* aEventCB)
{
if (aEvent.mMessage == eKeyPress ||
!BeforeAfterKeyboardEventEnabled()) {
EventDispatcher::Dispatch(aTarget, mPresContext,
&aEvent, nullptr, aStatus, aEventCB);
return;
}
MOZ_ASSERT(aTarget);
MOZ_ASSERT(aEvent.mMessage == eKeyDown || aEvent.mMessage == eKeyUp);
// Build up a target chain. Each item in the chain will receive a before event.
AutoTArray<nsCOMPtr<Element>, 5> chain;
bool targetIsIframe = false;
BuildTargetChainForBeforeAfterKeyboardEvent(aTarget, chain, targetIsIframe);
// Dispatch before events. If each item in the chain consumes the before
// event and doesn't prevent the default action, we will go further to
// dispatch the actual key event and after events in the reverse order.
// Otherwise, only items which has handled the before event will receive an
// after event.
size_t chainIndex;
bool defaultPrevented = false;
DispatchBeforeKeyboardEventInternal(chain, aEvent, chainIndex,
defaultPrevented);
// Before event is default-prevented. Dispatch after events with
// embeddedCancelled = false to partial items.
if (defaultPrevented) {
*aStatus = nsEventStatus_eConsumeNoDefault;
DispatchAfterKeyboardEventInternal(chain, aEvent, false, chainIndex);
// No need to forward the event to child process.
aEvent.StopCrossProcessForwarding();
return;
}
// Event listeners may kill nsPresContext and nsPresShell.
if (!CanDispatchEvent()) {
return;
}
// Dispatch actual key event to event target.
EventDispatcher::Dispatch(aTarget, mPresContext,
&aEvent, nullptr, aStatus, aEventCB);
if (aEvent.mFlags.mDefaultPrevented) {
// When embedder prevents the default action of actual key event, attribute
// 'embeddedCancelled' of after event is false, i.e. |!targetIsIframe|.
// On the contrary, if the defult action is prevented by embedded iframe,
// 'embeddedCancelled' is true which equals to |!targetIsIframe|.
DispatchAfterKeyboardEventInternal(chain, aEvent, !targetIsIframe, chainIndex);
return;
}
// Event listeners may kill nsPresContext and nsPresShell.
if (targetIsIframe || !CanDispatchEvent()) {
return;
}
// Dispatch after events to all items in the chain.
DispatchAfterKeyboardEventInternal(chain, aEvent,
aEvent.mFlags.mDefaultPrevented);
}
nsresult
PresShell::HandleEvent(nsIFrame* aFrame,
WidgetGUIEvent* aEvent,
bool aDontRetargetEvents,
nsEventStatus* aEventStatus,
nsIContent** aTargetContent)
{
#ifdef MOZ_TASK_TRACER
// Make touch events, mouse events and hardware key events to be the source
// events of TaskTracer, and originate the rest correlation tasks from here.
SourceEventType type = SourceEventType::Unknown;
if (aEvent->AsTouchEvent()) {
type = SourceEventType::Touch;
} else if (aEvent->AsMouseEvent()) {
type = SourceEventType::Mouse;
} else if (aEvent->AsKeyboardEvent()) {
type = SourceEventType::Key;
}
AutoSourceEvent taskTracerEvent(type);
#endif
NS_ASSERTION(aFrame, "aFrame should be not null");
if (sPointerEventEnabled) {
nsWeakFrame weakFrame(aFrame);
nsCOMPtr<nsIContent> targetContent;
DispatchPointerFromMouseOrTouch(this, aFrame, aEvent, aDontRetargetEvents,
aEventStatus, getter_AddRefs(targetContent));
if (!weakFrame.IsAlive()) {
if (targetContent) {
aFrame = targetContent->GetPrimaryFrame();
if (!aFrame) {
PushCurrentEventInfo(aFrame, targetContent);
nsresult rv = HandleEventInternal(aEvent, aEventStatus, true);
PopCurrentEventInfo();
return rv;
}
} else {
return NS_OK;
}
}
}
if (mIsDestroying ||
(sDisableNonTestMouseEvents && !aEvent->mFlags.mIsSynthesizedForTests &&
aEvent->HasMouseEventMessage())) {
return NS_OK;
}
RecordMouseLocation(aEvent);
if (AccessibleCaretEnabled()) {
// We have to target the focus window because regardless of where the
// touch goes, we want to access the copy paste manager.
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
nsCOMPtr<nsIDocument> retargetEventDoc =
window ? window->GetExtantDoc() : nullptr;
nsCOMPtr<nsIPresShell> presShell =
retargetEventDoc ? retargetEventDoc->GetShell() : nullptr;
RefPtr<AccessibleCaretEventHub> eventHub =
presShell ? presShell->GetAccessibleCaretEventHub() : nullptr;
if (eventHub) {
*aEventStatus = eventHub->HandleEvent(aEvent);
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
// If the event is consumed, cancel APZC panning by setting
// mMultipleActionsPrevented.
aEvent->mFlags.mMultipleActionsPrevented = true;
return NS_OK;
}
}
}
if (sPointerEventEnabled) {
UpdateActivePointerState(aEvent);
}
if (!nsContentUtils::IsSafeToRunScript() &&
aEvent->IsAllowedToDispatchDOMEvent()) {
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::OnCompositionEventDiscarded(
aEvent->AsCompositionEvent());
}
#ifdef DEBUG
if (aEvent->IsIMERelatedEvent()) {
nsPrintfCString warning("%d event is discarded", aEvent->mMessage);
NS_WARNING(warning.get());
}
#endif
nsContentUtils::WarnScriptWasIgnored(GetDocument());
return NS_OK;
}
nsIContent* capturingContent = ((aEvent->mClass == ePointerEventClass ||
aEvent->mClass == eWheelEventClass ||
aEvent->HasMouseEventMessage())
? GetCapturingContent()
: nullptr);
nsCOMPtr<nsIDocument> retargetEventDoc;
if (!aDontRetargetEvents) {
// key and IME related events should not cross top level window boundary.
// Basically, such input events should be fired only on focused widget.
// However, some IMEs might need to clean up composition after focused
// window is deactivated. And also some tests on MozMill want to test key
// handling on deactivated window because MozMill window can be activated
// during tests. So, there is no merit the events should be redirected to
// active window. So, the events should be handled on the last focused
// content in the last focused DOM window in same top level window.
// Note, if no DOM window has been focused yet, we can discard the events.
if (aEvent->IsTargetedAtFocusedWindow()) {
nsCOMPtr<nsPIDOMWindowOuter> window = GetFocusedDOMWindowInOurWindow();
// No DOM window in same top level window has not been focused yet,
// discard the events.
if (!window) {
return NS_OK;
}
retargetEventDoc = window->GetExtantDoc();
if (!retargetEventDoc)
return NS_OK;
} else if (capturingContent) {
// if the mouse is being captured then retarget the mouse event at the
// document that is being captured.
retargetEventDoc = capturingContent->GetCrossShadowCurrentDoc();
#ifdef ANDROID
} else if ((aEvent->mClass == eTouchEventClass) ||
(aEvent->mClass == eMouseEventClass) ||
(aEvent->mClass == eWheelEventClass)) {
retargetEventDoc = GetTouchEventTargetDocument();
#endif
}
if (retargetEventDoc) {
nsCOMPtr<nsIPresShell> presShell = retargetEventDoc->GetShell();
if (!presShell)
return NS_OK;
if (presShell != this) {
nsIFrame* frame = presShell->GetRootFrame();
if (!frame) {
if (aEvent->mMessage == eQueryTextContent ||
aEvent->IsContentCommandEvent()) {
return NS_OK;
}
frame = GetNearestFrameContainingPresShell(presShell);
}
if (!frame)
return NS_OK;
nsCOMPtr<nsIPresShell> shell = frame->PresContext()->GetPresShell();
return shell->HandleEvent(frame, aEvent, true, aEventStatus);
}
}
}
if (aEvent->mClass == eKeyboardEventClass &&
mDocument && mDocument->EventHandlingSuppressed()) {
if (aEvent->mMessage == eKeyDown) {
mNoDelayedKeyEvents = true;
} else if (!mNoDelayedKeyEvents) {
DelayedEvent* event = new DelayedKeyEvent(aEvent->AsKeyboardEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
nsIFrame* frame = aFrame;
if (aEvent->IsUsingCoordinates()) {
ReleasePointerCaptureCaller releasePointerCaptureCaller;
if (nsLayoutUtils::AreAsyncAnimationsEnabled() && mDocument) {
if (aEvent->mClass == eTouchEventClass) {
nsIDocument::UnlockPointer();
}
nsWeakFrame weakFrame(frame);
{ // scope for scriptBlocker.
nsAutoScriptBlocker scriptBlocker;
FlushThrottledStyles(GetRootPresShell()->GetDocument(), nullptr);
}
if (!weakFrame.IsAlive()) {
frame = GetNearestFrameContainingPresShell(this);
}
}
if (!frame) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
nsPresContext* framePresContext = frame->PresContext();
nsPresContext* rootPresContext = framePresContext->GetRootPresContext();
NS_ASSERTION(rootPresContext == mPresContext->GetRootPresContext(),
"How did we end up outside the connected prescontext/viewmanager hierarchy?");
// If we aren't starting our event dispatch from the root frame of the root prescontext,
// then someone must be capturing the mouse. In that case we don't want to search the popup
// list.
if (framePresContext == rootPresContext &&
frame == mFrameConstructor->GetRootFrame()) {
nsIFrame* popupFrame =
nsLayoutUtils::GetPopupFrameForEventCoordinates(rootPresContext, aEvent);
// If a remote browser is currently capturing input break out if we
// detect a chrome generated popup.
if (popupFrame && capturingContent &&
EventStateManager::IsRemoteTarget(capturingContent)) {
capturingContent = nullptr;
}
// If the popupFrame is an ancestor of the 'frame', the frame should
// handle the event, otherwise, the popup should handle it.
if (popupFrame &&
!nsContentUtils::ContentIsCrossDocDescendantOf(
framePresContext->GetPresShell()->GetDocument(),
popupFrame->GetContent())) {
frame = popupFrame;
}
}
bool captureRetarget = false;
if (capturingContent) {
// If a capture is active, determine if the docshell is visible. If not,
// clear the capture and target the mouse event normally instead. This
// would occur if the mouse button is held down while a tab change occurs.
// If the docshell is visible, look for a scrolling container.
bool vis;
nsCOMPtr<nsIBaseWindow> baseWin =
do_QueryInterface(mPresContext->GetContainerWeak());
if (baseWin && NS_SUCCEEDED(baseWin->GetVisibility(&vis)) && vis) {
captureRetarget = gCaptureInfo.mRetargetToElement;
if (!captureRetarget) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCrossShadowCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* captureFrame = capturingContent->GetPrimaryFrame();
if (captureFrame) {
if (capturingContent->IsHTMLElement(nsGkAtoms::select)) {
// a dropdown <select> has a child in its selectPopupList and we should
// capture on that instead.
nsIFrame* childFrame = captureFrame->GetChildList(nsIFrame::kSelectPopupList).FirstChild();
if (childFrame) {
captureFrame = childFrame;
}
}
// scrollable frames should use the scrolling container as
// the root instead of the document
nsIScrollableFrame* scrollFrame = do_QueryFrame(captureFrame);
if (scrollFrame) {
frame = scrollFrame->GetScrolledFrame();
}
}
}
}
else {
ClearMouseCapture(nullptr);
capturingContent = nullptr;
}
}
// all touch events except for touchstart use a captured target
if (aEvent->mClass == eTouchEventClass && aEvent->mMessage != eTouchStart) {
captureRetarget = true;
}
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
bool isWindowLevelMouseExit = (aEvent->mMessage == eMouseExitFromWidget) &&
(mouseEvent && mouseEvent->exit == WidgetMouseEvent::eTopLevel);
// Get the frame at the event point. However, don't do this if we're
// capturing and retargeting the event because the captured frame will
// be used instead below. Also keep using the root frame if we're dealing
// with a window-level mouse exit event since we want to start sending
// mouse out events at the root EventStateManager.
if (!captureRetarget && !isWindowLevelMouseExit) {
nsPoint eventPoint;
uint32_t flags = 0;
if (aEvent->mMessage == eTouchStart) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// if this is a continuing session, ensure that all these events are
// in the same document by taking the target of the events already in
// the capture list
nsCOMPtr<nsIContent> anyTarget;
if (TouchManager::gCaptureTouchList->Count() > 0 && touchEvent->touches.Length() > 1) {
for (auto iter = TouchManager::gCaptureTouchList->Iter();
!iter.Done();
iter.Next()) {
RefPtr<dom::Touch>& touch = iter.Data();
if (touch) {
dom::EventTarget* target = touch->GetTarget();
if (target) {
anyTarget = do_QueryInterface(target);
break;
}
}
}
}
for (int32_t i = touchEvent->touches.Length(); i; ) {
--i;
dom::Touch* touch = touchEvent->touches[i];
int32_t id = touch->Identifier();
if (!TouchManager::gCaptureTouchList->Get(id, nullptr)) {
// find the target for this touch
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
touch->mRefPoint,
frame);
nsIFrame* target = FindFrameTargetedByInputEvent(aEvent,
frame,
eventPoint,
flags);
if (target && !anyTarget) {
target->GetContentForEvent(aEvent, getter_AddRefs(anyTarget));
while (anyTarget && !anyTarget->IsElement()) {
anyTarget = anyTarget->GetParent();
}
touch->SetTarget(anyTarget);
} else {
nsIFrame* newTargetFrame = nullptr;
for (nsIFrame* f = target; f;
f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
if (f->PresContext()->Document() == anyTarget->OwnerDoc()) {
newTargetFrame = f;
break;
}
// We must be in a subdocument so jump directly to the root frame.
// GetParentOrPlaceholderForCrossDoc gets called immediately to
// jump up to the containing document.
f = f->PresContext()->GetPresShell()->GetRootFrame();
}
// if we couldn't find a target frame in the same document as
// anyTarget, remove the touch from the capture touch list, as
// well as the event->touches array. touchmove events that aren't
// in the captured touch list will be discarded
if (!newTargetFrame) {
touchEvent->touches.RemoveElementAt(i);
} else {
target = newTargetFrame;
nsCOMPtr<nsIContent> targetContent;
target->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
while (targetContent && !targetContent->IsElement()) {
targetContent = targetContent->GetParent();
}
touch->SetTarget(targetContent);
}
}
if (target) {
frame = target;
}
} else {
// This touch is an old touch, we need to ensure that is not
// marked as changed and set its target correctly
touch->mChanged = false;
int32_t id = touch->Identifier();
RefPtr<dom::Touch> oldTouch = TouchManager::gCaptureTouchList->GetWeak(id);
if (oldTouch) {
touch->SetTarget(oldTouch->mTarget);
}
}
}
} else {
eventPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, frame);
}
if (mouseEvent && mouseEvent->mClass == eMouseEventClass &&
mouseEvent->ignoreRootScrollFrame) {
flags |= INPUT_IGNORE_ROOT_SCROLL_FRAME;
}
nsIFrame* target =
FindFrameTargetedByInputEvent(aEvent, frame, eventPoint, flags);
if (target) {
frame = target;
}
}
// if a node is capturing the mouse, check if the event needs to be
// retargeted at the capturing content instead. This will be the case when
// capture retargeting is being used, no frame was found or the frame's
// content is not a descendant of the capturing content.
if (capturingContent &&
(gCaptureInfo.mRetargetToElement || !frame->GetContent() ||
!nsContentUtils::ContentIsCrossDocDescendantOf(frame->GetContent(),
capturingContent))) {
// A check was already done above to ensure that capturingContent is
// in this presshell.
NS_ASSERTION(capturingContent->GetCrossShadowCurrentDoc() == GetDocument(),
"Unexpected document");
nsIFrame* capturingFrame = capturingContent->GetPrimaryFrame();
if (capturingFrame) {
frame = capturingFrame;
}
}
if (aEvent->mClass == ePointerEventClass) {
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
// Try to keep frame for following check, because
// frame can be damaged during CheckPointerCaptureState.
nsWeakFrame frameKeeper(frame);
// Before any pointer events, we should check state of pointer capture,
// Thus got/lostpointercapture events emulate asynchronous behavior.
// Handlers of got/lostpointercapture events can change capturing state,
// That's why we should re-check pointer capture state until stable state.
while(CheckPointerCaptureState(pointerEvent->pointerId));
// Prevent application crashes, in case damaged frame.
if (!frameKeeper.IsAlive()) {
frame = nullptr;
}
}
}
if (aEvent->mClass == ePointerEventClass &&
aEvent->mMessage != ePointerDown) {
if (WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent()) {
uint32_t pointerId = pointerEvent->pointerId;
nsIContent* pointerCapturingContent = GetPointerCapturingContent(pointerId);
if (pointerCapturingContent) {
if (nsIFrame* capturingFrame = pointerCapturingContent->GetPrimaryFrame()) {
// If pointer capture is set, we should suppress pointerover/pointerenter events
// for all elements except element which have pointer capture. (Code in EventStateManager)
pointerEvent->retargetedByPointerCapture =
frame && frame->GetContent() &&
!nsContentUtils::ContentIsDescendantOf(frame->GetContent(), pointerCapturingContent);
frame = capturingFrame;
}
if (pointerEvent->mMessage == ePointerUp ||
pointerEvent->mMessage == ePointerCancel) {
// Implicitly releasing capture for given pointer.
// ePointerLostCapture should be send after ePointerUp or
// ePointerCancel.
releasePointerCaptureCaller.SetTarget(pointerId);
}
}
}
}
// Suppress mouse event if it's being targeted at an element inside
// a document which needs events suppressed
if (aEvent->mClass == eMouseEventClass &&
frame->PresContext()->Document()->EventHandlingSuppressed()) {
if (aEvent->mMessage == eMouseDown) {
mNoDelayedMouseEvents = true;
} else if (!mNoDelayedMouseEvents && aEvent->mMessage == eMouseUp) {
DelayedEvent* event = new DelayedMouseEvent(aEvent->AsMouseEvent());
if (!mDelayedEvents.AppendElement(event)) {
delete event;
}
}
return NS_OK;
}
if (!frame) {
NS_WARNING("Nothing to handle this event!");
return NS_OK;
}
PresShell* shell =
static_cast<PresShell*>(frame->PresContext()->PresShell());
switch (aEvent->mMessage) {
case eTouchMove:
case eTouchCancel:
case eTouchEnd: {
// get the correct shell to dispatch to
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
for (dom::Touch* touch : touchEvent->touches) {
if (!touch) {
break;
}
RefPtr<dom::Touch> oldTouch =
TouchManager::gCaptureTouchList->GetWeak(touch->Identifier());
if (!oldTouch) {
break;
}
nsCOMPtr<nsIContent> content =
do_QueryInterface(oldTouch->GetTarget());
if (!content) {
break;
}
nsIFrame* contentFrame = content->GetPrimaryFrame();
if (!contentFrame) {
break;
}
shell = static_cast<PresShell*>(
contentFrame->PresContext()->PresShell());
if (shell) {
break;
}
}
break;
}
default:
break;
}
// Check if we have an active EventStateManager which isn't the
// EventStateManager of the current PresContext.
// If that is the case, and mouse is over some ancestor document,
// forward event handling to the active document.
// This way content can get mouse events even when
// mouse is over the chrome or outside the window.
//
// Note, currently for backwards compatibility we don't forward mouse events
// to the active document when mouse is over some subdocument.
if (EventStateManager* activeESM = EventStateManager::GetActiveEventStateManager()) {
if (aEvent->mClass == ePointerEventClass || aEvent->HasMouseEventMessage()) {
if (activeESM != shell->GetPresContext()->EventStateManager()) {
if (nsPresContext* activeContext = activeESM->GetPresContext()) {
if (nsIPresShell* activeShell = activeContext->GetPresShell()) {
if (nsContentUtils::ContentIsCrossDocDescendantOf(activeShell->GetDocument(),
shell->GetDocument())) {
shell = static_cast<PresShell*>(activeShell);
frame = shell->GetRootFrame();
}
}
}
}
}
}
// Before HandlePositionedEvent we should save mPointerEventTarget in some cases
nsWeakFrame weakFrame;
if (sPointerEventEnabled && aTargetContent && ePointerEventClass == aEvent->mClass) {
weakFrame = frame;
shell->mPointerEventTarget = frame->GetContent();
MOZ_ASSERT(!frame->GetContent() || shell->GetDocument() == frame->GetContent()->OwnerDoc());
}
nsresult rv;
if (shell != this) {
// Handle the event in the correct shell.
// Prevent deletion until we're done with event handling (bug 336582).
nsCOMPtr<nsIPresShell> kungFuDeathGrip(shell);
// We pass the subshell's root frame as the frame to start from. This is
// the only correct alternative; if the event was captured then it
// must have been captured by us or some ancestor shell and we
// now ask the subshell to dispatch it normally.
rv = shell->HandlePositionedEvent(frame, aEvent, aEventStatus);
} else {
rv = HandlePositionedEvent(frame, aEvent, aEventStatus);
}
// After HandlePositionedEvent we should reestablish
// content (which still live in tree) in some cases
if (sPointerEventEnabled && aTargetContent && ePointerEventClass == aEvent->mClass) {
if (!weakFrame.IsAlive()) {
shell->mPointerEventTarget.swap(*aTargetContent);
}
}
return rv;
}
nsresult rv = NS_OK;
if (frame) {
PushCurrentEventInfo(nullptr, nullptr);
// key and IME related events go to the focused frame in this DOM window.
if (aEvent->IsTargetedAtFocusedContent()) {
mCurrentEventContent = nullptr;
nsCOMPtr<nsPIDOMWindowOuter> window = mDocument->GetWindow();
nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
nsCOMPtr<nsIContent> eventTarget =
nsFocusManager::GetFocusedDescendant(window, false,
getter_AddRefs(focusedWindow));
// otherwise, if there is no focused content or the focused content has
// no frame, just use the root content. This ensures that key events
// still get sent to the window properly if nothing is focused or if a
// frame goes away while it is focused.
if (!eventTarget || !eventTarget->GetPrimaryFrame()) {
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
if (htmlDoc) {
nsCOMPtr<nsIDOMHTMLElement> body;
htmlDoc->GetBody(getter_AddRefs(body));
eventTarget = do_QueryInterface(body);
if (!eventTarget) {
eventTarget = mDocument->GetRootElement();
}
} else {
eventTarget = mDocument->GetRootElement();
}
}
if (aEvent->mMessage == eKeyDown) {
NS_IF_RELEASE(gKeyDownTarget);
NS_IF_ADDREF(gKeyDownTarget = eventTarget);
}
else if ((aEvent->mMessage == eKeyPress ||
aEvent->mMessage == eKeyUp) &&
gKeyDownTarget) {
// If a different element is now focused for the keypress/keyup event
// than what was focused during the keydown event, check if the new
// focused element is not in a chrome document any more, and if so,
// retarget the event back at the keydown target. This prevents a
// content area from grabbing the focus from chrome in-between key
// events.
if (eventTarget) {
bool keyDownIsChrome = nsContentUtils::IsChromeDoc(gKeyDownTarget->GetComposedDoc());
if (keyDownIsChrome != nsContentUtils::IsChromeDoc(eventTarget->GetComposedDoc()) ||
(keyDownIsChrome && TabParent::GetFrom(eventTarget))) {
eventTarget = gKeyDownTarget;
}
}
if (aEvent->mMessage == eKeyUp) {
NS_RELEASE(gKeyDownTarget);
}
}
mCurrentEventFrame = nullptr;
nsIDocument* targetDoc = eventTarget ? eventTarget->OwnerDoc() : nullptr;
if (targetDoc && targetDoc != mDocument) {
PopCurrentEventInfo();
nsCOMPtr<nsIPresShell> shell = targetDoc->GetShell();
if (shell) {
rv = static_cast<PresShell*>(shell.get())->
HandleRetargetedEvent(aEvent, aEventStatus, eventTarget);
}
return rv;
} else {
mCurrentEventContent = eventTarget;
}
if (!GetCurrentEventContent() || !GetCurrentEventFrame() ||
InZombieDocument(mCurrentEventContent)) {
rv = RetargetEventToParent(aEvent, aEventStatus);
PopCurrentEventInfo();
return rv;
}
} else {
mCurrentEventFrame = frame;
}
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aEventStatus, true);
}
#ifdef DEBUG
ShowEventTargetDebug();
#endif
PopCurrentEventInfo();
} else {
// Activation events need to be dispatched even if no frame was found, since
// we don't want the focus to be out of sync.
if (!NS_EVENT_NEEDS_FRAME(aEvent)) {
mCurrentEventFrame = nullptr;
return HandleEventInternal(aEvent, aEventStatus, true);
}
else if (aEvent->HasKeyEventMessage()) {
// Keypress events in new blank tabs should not be completely thrown away.
// Retarget them -- the parent chrome shell might make use of them.
return RetargetEventToParent(aEvent, aEventStatus);
}
}
return rv;
}
#ifdef ANDROID
nsIDocument*
PresShell::GetTouchEventTargetDocument()
{
nsPresContext* context = GetPresContext();
if (!context || !context->IsRoot()) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeItem> shellAsTreeItem = context->GetDocShell();
if (!shellAsTreeItem) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeOwner> owner;
shellAsTreeItem->GetTreeOwner(getter_AddRefs(owner));
if (!owner) {
return nullptr;
}
// now get the primary content shell (active tab)
nsCOMPtr<nsIDocShellTreeItem> item;
owner->GetPrimaryContentShell(getter_AddRefs(item));
nsCOMPtr<nsIDocShell> childDocShell = do_QueryInterface(item);
if (!childDocShell) {
return nullptr;
}
return childDocShell->GetDocument();
}
#endif
#ifdef DEBUG
void
PresShell::ShowEventTargetDebug()
{
if (nsFrame::GetShowEventTargetFrameBorder() &&
GetCurrentEventFrame()) {
if (mDrawEventTargetFrame) {
mDrawEventTargetFrame->InvalidateFrame();
}
mDrawEventTargetFrame = mCurrentEventFrame;
mDrawEventTargetFrame->InvalidateFrame();
}
}
#endif
nsresult
PresShell::HandlePositionedEvent(nsIFrame* aTargetFrame,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, nullptr);
mCurrentEventFrame = aTargetFrame;
if (mCurrentEventFrame) {
nsCOMPtr<nsIContent> targetElement;
mCurrentEventFrame->GetContentForEvent(aEvent,
getter_AddRefs(targetElement));
// If there is no content for this frame, target it anyway. Some
// frames can be targeted but do not have content, particularly
// windows with scrolling off.
if (targetElement) {
// Bug 103055, bug 185889: mouse events apply to *elements*, not all
// nodes. Thus we get the nearest element parent here.
// XXX we leave the frame the same even if we find an element
// parent, so that the text frame will receive the event (selection
// and friends are the ones who care about that anyway)
//
// We use weak pointers because during this tight loop, the node
// will *not* go away. And this happens on every mousemove.
while (targetElement && !targetElement->IsElement()) {
targetElement = targetElement->GetFlattenedTreeParent();
}
// If we found an element, target it. Otherwise, target *nothing*.
if (!targetElement) {
mCurrentEventContent = nullptr;
mCurrentEventFrame = nullptr;
} else if (targetElement != mCurrentEventContent) {
mCurrentEventContent = targetElement;
}
}
}
if (GetCurrentEventFrame()) {
rv = HandleEventInternal(aEvent, aEventStatus, true);
}
#ifdef DEBUG
ShowEventTargetDebug();
#endif
PopCurrentEventInfo();
return rv;
}
nsresult
PresShell::HandleEventWithTarget(WidgetEvent* aEvent, nsIFrame* aFrame,
nsIContent* aContent, nsEventStatus* aStatus)
{
#if DEBUG
MOZ_ASSERT(!aFrame || aFrame->PresContext()->GetPresShell() == this,
"wrong shell");
if (aContent) {
nsIDocument* doc = aContent->GetComposedDoc();
NS_ASSERTION(doc, "event for content that isn't in a document");
NS_ASSERTION(!doc || doc->GetShell() == this, "wrong shell");
}
#endif
NS_ENSURE_STATE(!aContent || aContent->GetComposedDoc() == mDocument);
PushCurrentEventInfo(aFrame, aContent);
nsresult rv = HandleEventInternal(aEvent, aStatus, false);
PopCurrentEventInfo();
return rv;
}
nsresult
PresShell::HandleEventInternal(WidgetEvent* aEvent,
nsEventStatus* aStatus,
bool aIsHandlingNativeEvent)
{
RefPtr<EventStateManager> manager = mPresContext->EventStateManager();
nsresult rv = NS_OK;
if (!NS_EVENT_NEEDS_FRAME(aEvent) || GetCurrentEventFrame() || GetCurrentEventContent()) {
bool touchIsNew = false;
bool isHandlingUserInput = false;
// XXX How about IME events and input events for plugins?
if (aEvent->mFlags.mIsTrusted) {
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
nsIDocument* doc = GetCurrentEventContent() ?
mCurrentEventContent->OwnerDoc() : nullptr;
auto keyCode = aEvent->AsKeyboardEvent()->keyCode;
if (keyCode == NS_VK_ESCAPE) {
nsIDocument* root = nsContentUtils::GetRootDocument(doc);
if (root && root->GetFullscreenElement()) {
// Prevent default action on ESC key press when exiting
// DOM fullscreen mode. This prevents the browser ESC key
// handler from stopping all loads in the document, which
// would cause <video> loads to stop.
// XXX We need to claim the Escape key event which will be
// dispatched only into chrome is already consumed by
// content because we need to prevent its default here
// for some reasons (not sure) but we need to detect
// if a chrome event handler will call PreventDefault()
// again and check it later.
aEvent->PreventDefaultBeforeDispatch();
aEvent->mFlags.mOnlyChromeDispatch = true;
// The event listeners in chrome can prevent this ESC behavior by
// calling prevent default on the preceding keydown/press events.
if (!mIsLastChromeOnlyEscapeKeyConsumed &&
aEvent->mMessage == eKeyUp) {
// ESC key released while in DOM fullscreen mode.
// Fully exit all browser windows and documents from
// fullscreen mode.
nsIDocument::AsyncExitFullscreen(nullptr);
}
}
nsCOMPtr<nsIDocument> pointerLockedDoc =
do_QueryReferent(EventStateManager::sPointerLockedDoc);
if (!mIsLastChromeOnlyEscapeKeyConsumed && pointerLockedDoc) {
// XXX See above comment to understand the reason why this needs
// to claim that the Escape key event is consumed by content
// even though it will be dispatched only into chrome.
aEvent->PreventDefaultBeforeDispatch();
aEvent->mFlags.mOnlyChromeDispatch = true;
if (aEvent->mMessage == eKeyUp) {
nsIDocument::UnlockPointer();
}
}
}
if (keyCode != NS_VK_ESCAPE && keyCode != NS_VK_SHIFT &&
keyCode != NS_VK_CONTROL && keyCode != NS_VK_ALT &&
keyCode != NS_VK_WIN && keyCode != NS_VK_META) {
// Allow keys other than ESC and modifiers be marked as a
// valid user input for triggering popup, fullscreen, and
// pointer lock.
isHandlingUserInput = true;
}
break;
}
case eMouseDown:
case eMouseUp:
isHandlingUserInput = true;
break;
case eDrop: {
nsCOMPtr<nsIDragSession> session = nsContentUtils::GetDragSession();
if (session) {
bool onlyChromeDrop = false;
session->GetOnlyChromeDrop(&onlyChromeDrop);
if (onlyChromeDrop) {
aEvent->mFlags.mOnlyChromeDispatch = true;
}
}
break;
}
default:
break;
}
if (!mTouchManager.PreHandleEvent(aEvent, aStatus,
touchIsNew, isHandlingUserInput,
mCurrentEventContent)) {
return NS_OK;
}
}
if (aEvent->mMessage == eContextMenu) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->context == WidgetMouseEvent::eContextMenuKey &&
!AdjustContextMenuKeyEvent(mouseEvent)) {
return NS_OK;
}
if (mouseEvent->IsShift()) {
aEvent->mFlags.mOnlyChromeDispatch = true;
aEvent->mFlags.mRetargetToNonNativeAnonymous = true;
}
}
AutoHandlingUserInputStatePusher userInpStatePusher(isHandlingUserInput,
aEvent, mDocument);
if (aEvent->mFlags.mIsTrusted && aEvent->mMessage == eMouseMove) {
nsIPresShell::AllowMouseCapture(
EventStateManager::GetActiveEventStateManager() == manager);
}
nsAutoPopupStatePusher popupStatePusher(
Event::GetEventPopupControlState(aEvent));
// FIXME. If the event was reused, we need to clear the old target,
// bug 329430
aEvent->target = nullptr;
// 1. Give event to event manager for pre event state changes and
// generation of synthetic events.
rv = manager->PreHandleEvent(mPresContext, aEvent, mCurrentEventFrame,
mCurrentEventContent, aStatus);
// 2. Give event to the DOM for third party and JS use.
if (NS_SUCCEEDED(rv)) {
bool wasHandlingKeyBoardEvent =
nsContentUtils::IsHandlingKeyBoardEvent();
if (aEvent->mClass == eKeyboardEventClass) {
nsContentUtils::SetIsHandlingKeyBoardEvent(true);
}
if (aEvent->IsAllowedToDispatchDOMEvent()) {
MOZ_ASSERT(nsContentUtils::IsSafeToRunScript(),
"Somebody changed aEvent to cause a DOM event!");
nsPresShellEventCB eventCB(this);
if (aEvent->mClass == eTouchEventClass) {
DispatchTouchEventToDOM(aEvent, aStatus, &eventCB, touchIsNew);
} else {
DispatchEventToDOM(aEvent, aStatus, &eventCB);
}
}
nsContentUtils::SetIsHandlingKeyBoardEvent(wasHandlingKeyBoardEvent);
// 3. Give event to event manager for post event state changes and
// generation of synthetic events.
if (!mIsDestroying && NS_SUCCEEDED(rv)) {
rv = manager->PostHandleEvent(mPresContext, aEvent,
GetCurrentEventFrame(), aStatus);
}
}
if (!mIsDestroying && aIsHandlingNativeEvent) {
// Ensure that notifications to IME should be sent before getting next
// native event from the event queue.
// XXX Should we check the event message or event class instead of
// using aIsHandlingNativeEvent?
manager->TryToFlushPendingNotificationsToIME();
}
switch (aEvent->mMessage) {
case eKeyPress:
case eKeyDown:
case eKeyUp: {
if (aEvent->AsKeyboardEvent()->keyCode == NS_VK_ESCAPE) {
if (aEvent->mMessage == eKeyUp) {
// Reset this flag after key up is handled.
mIsLastChromeOnlyEscapeKeyConsumed = false;
} else {
if (aEvent->mFlags.mOnlyChromeDispatch &&
aEvent->mFlags.mDefaultPreventedByChrome) {
mIsLastChromeOnlyEscapeKeyConsumed = true;
}
}
}
break;
}
case eMouseUp:
// reset the capturing content now that the mouse button is up
SetCapturingContent(nullptr, 0);
break;
case eMouseMove:
nsIPresShell::AllowMouseCapture(false);
break;
default:
break;
}
}
if (Telemetry::CanRecordBase() &&
!aEvent->timeStamp.IsNull() &&
aEvent->AsInputEvent()) {
double millis = (TimeStamp::Now() - aEvent->timeStamp).ToMilliseconds();
Telemetry::Accumulate(Telemetry::INPUT_EVENT_RESPONSE_MS, millis);
}
return rv;
}
void
nsIPresShell::DispatchGotOrLostPointerCaptureEvent(bool aIsGotCapture,
uint32_t aPointerId,
uint16_t aPointerType,
bool aIsPrimary,
nsIContent* aCaptureTarget)
{
PointerEventInit init;
init.mPointerId = aPointerId;
init.mBubbles = true;
ConvertPointerTypeToString(aPointerType, init.mPointerType);
init.mIsPrimary = aIsPrimary;
RefPtr<mozilla::dom::PointerEvent> event;
event = PointerEvent::Constructor(aCaptureTarget,
aIsGotCapture
? NS_LITERAL_STRING("gotpointercapture")
: NS_LITERAL_STRING("lostpointercapture"),
init);
if (event) {
bool dummy;
// If the capturing element was removed from the DOM tree,
// lostpointercapture event should be fired at the document.
if (!aIsGotCapture && !aCaptureTarget->IsInDoc()) {
aCaptureTarget->OwnerDoc()->DispatchEvent(event->InternalDOMEvent(), &dummy);
} else {
aCaptureTarget->DispatchEvent(event->InternalDOMEvent(), &dummy);
}
}
}
nsresult
PresShell::DispatchEventToDOM(WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB)
{
nsresult rv = NS_OK;
nsCOMPtr<nsINode> eventTarget = mCurrentEventContent.get();
nsPresShellEventCB* eventCBPtr = aEventCB;
if (!eventTarget) {
nsCOMPtr<nsIContent> targetContent;
if (mCurrentEventFrame) {
rv = mCurrentEventFrame->
GetContentForEvent(aEvent, getter_AddRefs(targetContent));
}
if (NS_SUCCEEDED(rv) && targetContent) {
eventTarget = do_QueryInterface(targetContent);
} else if (mDocument) {
eventTarget = do_QueryInterface(mDocument);
// If we don't have any content, the callback wouldn't probably
// do nothing.
eventCBPtr = nullptr;
}
}
if (eventTarget) {
if (aEvent->mClass == eCompositionEventClass) {
IMEStateManager::DispatchCompositionEvent(eventTarget, mPresContext,
aEvent->AsCompositionEvent(),
aStatus, eventCBPtr);
} else if (aEvent->mClass == eKeyboardEventClass) {
HandleKeyboardEvent(eventTarget, *(aEvent->AsKeyboardEvent()),
false, aStatus, eventCBPtr);
} else {
EventDispatcher::Dispatch(eventTarget, mPresContext,
aEvent, nullptr, aStatus, eventCBPtr);
}
}
return rv;
}
void
PresShell::DispatchTouchEventToDOM(WidgetEvent* aEvent,
nsEventStatus* aStatus,
nsPresShellEventCB* aEventCB,
bool aTouchIsNew)
{
// calling preventDefault on touchstart or the first touchmove for a
// point prevents mouse events. calling it on the touchend should
// prevent click dispatching.
bool canPrevent = (aEvent->mMessage == eTouchStart) ||
(aEvent->mMessage == eTouchMove && aTouchIsNew) ||
(aEvent->mMessage == eTouchEnd);
bool preventDefault = false;
nsEventStatus tmpStatus = nsEventStatus_eIgnore;
WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
// loop over all touches and dispatch events on any that have changed
for (dom::Touch* touch : touchEvent->touches) {
if (!touch || !touch->mChanged) {
continue;
}
nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
nsCOMPtr<nsIContent> content = do_QueryInterface(targetPtr);
if (!content) {
continue;
}
nsIDocument* doc = content->OwnerDoc();
nsIContent* capturingContent = GetCapturingContent();
if (capturingContent) {
if (capturingContent->OwnerDoc() != doc) {
// Wrong document, don't dispatch anything.
continue;
}
content = capturingContent;
}
// copy the event
WidgetTouchEvent newEvent(touchEvent->mFlags.mIsTrusted,
touchEvent->mMessage, touchEvent->widget);
newEvent.AssignTouchEventData(*touchEvent, false);
newEvent.target = targetPtr;
RefPtr<PresShell> contentPresShell;
if (doc == mDocument) {
contentPresShell = static_cast<PresShell*>(doc->GetShell());
if (contentPresShell) {
//XXXsmaug huge hack. Pushing possibly capturing content,
// even though event target is something else.
contentPresShell->PushCurrentEventInfo(
content->GetPrimaryFrame(), content);
}
}
nsIPresShell *presShell = doc->GetShell();
if (!presShell) {
continue;
}
nsPresContext *context = presShell->GetPresContext();
tmpStatus = nsEventStatus_eIgnore;
EventDispatcher::Dispatch(targetPtr, context,
&newEvent, nullptr, &tmpStatus, aEventCB);
if (nsEventStatus_eConsumeNoDefault == tmpStatus ||
newEvent.mFlags.mMultipleActionsPrevented) {
preventDefault = true;
}
if (newEvent.mFlags.mMultipleActionsPrevented) {
touchEvent->mFlags.mMultipleActionsPrevented = true;
}
if (contentPresShell) {
contentPresShell->PopCurrentEventInfo();
}
}
if (preventDefault && canPrevent) {
*aStatus = nsEventStatus_eConsumeNoDefault;
} else {
*aStatus = nsEventStatus_eIgnore;
}
}
// Dispatch event to content only (NOT full processing)
// See also HandleEventWithTarget which does full event processing.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
WidgetEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
// Bug 41013: Check if the event should be dispatched to content.
// It's possible that we are in the middle of destroying the window
// and the js context is out of date. This check detects the case
// that caused a crash in bug 41013, but there may be a better way
// to handle this situation!
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
// Dispatch event to content
rv = EventDispatcher::Dispatch(aTargetContent, mPresContext, aEvent,
nullptr, aStatus);
}
PopCurrentEventInfo();
return rv;
}
// See the method above.
nsresult
PresShell::HandleDOMEventWithTarget(nsIContent* aTargetContent,
nsIDOMEvent* aEvent,
nsEventStatus* aStatus)
{
nsresult rv = NS_OK;
PushCurrentEventInfo(nullptr, aTargetContent);
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (container) {
rv = EventDispatcher::DispatchDOMEvent(aTargetContent, nullptr, aEvent,
mPresContext, aStatus);
}
PopCurrentEventInfo();
return rv;
}
bool
PresShell::AdjustContextMenuKeyEvent(WidgetMouseEvent* aEvent)
{
#ifdef MOZ_XUL
// if a menu is open, open the context menu relative to the active item on the menu.
nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
if (pm) {
nsIFrame* popupFrame = pm->GetTopPopup(ePopupTypeMenu);
if (popupFrame) {
nsIFrame* itemFrame =
(static_cast<nsMenuPopupFrame *>(popupFrame))->GetCurrentMenuItem();
if (!itemFrame)
itemFrame = popupFrame;
nsCOMPtr<nsIWidget> widget = popupFrame->GetNearestWidget();
aEvent->widget = widget;
LayoutDeviceIntPoint widgetPoint = widget->WidgetToScreenOffset();
aEvent->refPoint = LayoutDeviceIntPoint::FromUnknownPoint(
itemFrame->GetScreenRect().BottomLeft()) - widgetPoint;
mCurrentEventContent = itemFrame->GetContent();
mCurrentEventFrame = itemFrame;
return true;
}
}
#endif
// If we're here because of the key-equiv for showing context menus, we
// have to twiddle with the NS event to make sure the context menu comes
// up in the upper left of the relevant content area before we create
// the DOM event. Since we never call InitMouseEvent() on the event,
// the client X/Y will be 0,0. We can make use of that if the widget is null.
// Use the root view manager's widget since it's most likely to have one,
// and the coordinates returned by GetCurrentItemAndPositionForElement
// are relative to the widget of the root of the root view manager.
nsRootPresContext* rootPC = mPresContext->GetRootPresContext();
aEvent->refPoint.x = 0;
aEvent->refPoint.y = 0;
if (rootPC) {
rootPC->PresShell()->GetViewManager()->
GetRootWidget(getter_AddRefs(aEvent->widget));
if (aEvent->widget) {
// default the refpoint to the topleft of our document
nsPoint offset(0, 0);
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
nsView* view = rootFrame->GetClosestView(&offset);
offset += view->GetOffsetToWidget(aEvent->widget);
aEvent->refPoint =
LayoutDeviceIntPoint::FromAppUnitsToNearest(offset, mPresContext->AppUnitsPerDevPixel());
}
}
} else {
aEvent->widget = nullptr;
}
// see if we should use the caret position for the popup
LayoutDeviceIntPoint caretPoint;
// Beware! This may flush notifications via synchronous
// ScrollSelectionIntoView.
if (PrepareToUseCaretPosition(aEvent->widget, caretPoint)) {
// caret position is good
aEvent->refPoint = caretPoint;
return true;
}
// If we're here because of the key-equiv for showing context menus, we
// have to reset the event target to the currently focused element. Get it
// from the focus controller.
nsCOMPtr<nsIDOMElement> currentFocus;
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm)
fm->GetFocusedElement(getter_AddRefs(currentFocus));
// Reset event coordinates relative to focused frame in view
if (currentFocus) {
nsCOMPtr<nsIContent> currentPointElement;
GetCurrentItemAndPositionForElement(currentFocus,
getter_AddRefs(currentPointElement),
aEvent->refPoint,
aEvent->widget);
if (currentPointElement) {
mCurrentEventContent = currentPointElement;
mCurrentEventFrame = nullptr;
GetCurrentEventFrame();
}
}
return true;
}
// PresShell::PrepareToUseCaretPosition
//
// This checks to see if we should use the caret position for popup context
// menus. Returns true if the caret position should be used, and the
// coordinates of that position is returned in aTargetPt. This function
// will also scroll the window as needed to make the caret visible.
//
// The event widget should be the widget that generated the event, and
// whose coordinate system the resulting event's refPoint should be
// relative to. The returned point is in device pixels realtive to the
// widget passed in.
bool
PresShell::PrepareToUseCaretPosition(nsIWidget* aEventWidget,
LayoutDeviceIntPoint& aTargetPt)
{
nsresult rv;
// check caret visibility
RefPtr<nsCaret> caret = GetCaret();
NS_ENSURE_TRUE(caret, false);
bool caretVisible = caret->IsVisible();
if (!caretVisible)
return false;
// caret selection, this is a temporary weak reference, so no refcounting is
// needed
nsISelection* domSelection = caret->GetSelection();
NS_ENSURE_TRUE(domSelection, false);
// since the match could be an anonymous textnode inside a
// <textarea> or text <input>, we need to get the outer frame
// note: frames are not refcounted
nsIFrame* frame = nullptr; // may be nullptr
nsCOMPtr<nsIDOMNode> node;
rv = domSelection->GetFocusNode(getter_AddRefs(node));
NS_ENSURE_SUCCESS(rv, false);
NS_ENSURE_TRUE(node, false);
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (content) {
nsIContent* nonNative = content->FindFirstNonChromeOnlyAccessContent();
content = nonNative;
}
if (content) {
// It seems like ScrollSelectionIntoView should be enough, but it's
// not. The problem is that scrolling the selection into view when it is
// below the current viewport will align the top line of the frame exactly
// with the bottom of the window. This is fine, BUT, the popup event causes
// the control to be re-focused which does this exact call to
// ScrollContentIntoView, which has a one-pixel disagreement of whether the
// frame is actually in view. The result is that the frame is aligned with
// the top of the window, but the menu is still at the bottom.
//
// Doing this call first forces the frame to be in view, eliminating the
// problem. The only difference in the result is that if your cursor is in
// an edit box below the current view, you'll get the edit box aligned with
// the top of the window. This is arguably better behavior anyway.
rv = ScrollContentIntoView(content,
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::ScrollAxis(
nsIPresShell::SCROLL_MINIMUM,
nsIPresShell::SCROLL_IF_NOT_VISIBLE),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
NS_ENSURE_SUCCESS(rv, false);
frame = content->GetPrimaryFrame();
NS_WARN_IF_FALSE(frame, "No frame for focused content?");
}
// Actually scroll the selection (ie caret) into view. Note that this must
// be synchronous since we will be checking the caret position on the screen.
//
// Be easy about errors, and just don't scroll in those cases. Better to have
// the correct menu at a weird place than the wrong menu.
// After ScrollSelectionIntoView(), the pending notifications might be
// flushed and PresShell/PresContext/Frames may be dead. See bug 418470.
nsCOMPtr<nsISelectionController> selCon;
if (frame)
frame->GetSelectionController(GetPresContext(), getter_AddRefs(selCon));
else
selCon = static_cast<nsISelectionController *>(this);
if (selCon) {
rv = selCon->ScrollSelectionIntoView(nsISelectionController::SELECTION_NORMAL,
nsISelectionController::SELECTION_FOCUS_REGION,
nsISelectionController::SCROLL_SYNCHRONOUS);
NS_ENSURE_SUCCESS(rv, false);
}
nsPresContext* presContext = GetPresContext();
// get caret position relative to the closest view
nsRect caretCoords;
nsIFrame* caretFrame = caret->GetGeometry(&caretCoords);
if (!caretFrame)
return false;
nsPoint viewOffset;
nsView* view = caretFrame->GetClosestView(&viewOffset);
if (!view)
return false;
// and then get the caret coords relative to the event widget
if (aEventWidget) {
viewOffset += view->GetOffsetToWidget(aEventWidget);
}
caretCoords.MoveBy(viewOffset);
// caret coordinates are in app units, convert to pixels
aTargetPt.x =
presContext->AppUnitsToDevPixels(caretCoords.x + caretCoords.width);
aTargetPt.y =
presContext->AppUnitsToDevPixels(caretCoords.y + caretCoords.height);
// make sure rounding doesn't return a pixel which is outside the caret
// (e.g. one line lower)
aTargetPt.y -= 1;
return true;
}
void
PresShell::GetCurrentItemAndPositionForElement(nsIDOMElement *aCurrentEl,
nsIContent** aTargetToUse,
LayoutDeviceIntPoint& aTargetPt,
nsIWidget *aRootWidget)
{
nsCOMPtr<nsIContent> focusedContent(do_QueryInterface(aCurrentEl));
ScrollContentIntoView(focusedContent,
ScrollAxis(),
ScrollAxis(),
nsIPresShell::SCROLL_OVERFLOW_HIDDEN);
nsPresContext* presContext = GetPresContext();
bool istree = false, checkLineHeight = true;
nscoord extraTreeY = 0;
#ifdef MOZ_XUL
// Set the position to just underneath the current item for multi-select
// lists or just underneath the selected item for single-select lists. If
// the element is not a list, or there is no selection, leave the position
// as is.
nsCOMPtr<nsIDOMXULSelectControlItemElement> item;
nsCOMPtr<nsIDOMXULMultiSelectControlElement> multiSelect =
do_QueryInterface(aCurrentEl);
if (multiSelect) {
checkLineHeight = false;
int32_t currentIndex;
multiSelect->GetCurrentIndex(&currentIndex);
if (currentIndex >= 0) {
nsCOMPtr<nsIDOMXULElement> xulElement(do_QueryInterface(aCurrentEl));
if (xulElement) {
nsCOMPtr<nsIBoxObject> box;
xulElement->GetBoxObject(getter_AddRefs(box));
nsCOMPtr<nsITreeBoxObject> treeBox(do_QueryInterface(box));
// Tree view special case (tree items have no frames)
// Get the focused row and add its coordinates, which are already in pixels
// XXX Boris, should we create a new interface so that this doesn't
// need to know about trees? Something like nsINodelessChildCreator which
// could provide the current focus coordinates?
if (treeBox) {
treeBox->EnsureRowIsVisible(currentIndex);
int32_t firstVisibleRow, rowHeight;
treeBox->GetFirstVisibleRow(&firstVisibleRow);
treeBox->GetRowHeight(&rowHeight);
extraTreeY += presContext->CSSPixelsToAppUnits(
(currentIndex - firstVisibleRow + 1) * rowHeight);
istree = true;
nsCOMPtr<nsITreeColumns> cols;
treeBox->GetColumns(getter_AddRefs(cols));
if (cols) {
nsCOMPtr<nsITreeColumn> col;
cols->GetFirstColumn(getter_AddRefs(col));
if (col) {
nsCOMPtr<nsIDOMElement> colElement;
col->GetElement(getter_AddRefs(colElement));
nsCOMPtr<nsIContent> colContent(do_QueryInterface(colElement));
if (colContent) {
nsIFrame* frame = colContent->GetPrimaryFrame();
if (frame) {
extraTreeY += frame->GetSize().height;
}
}
}
}
}
else {
multiSelect->GetCurrentItem(getter_AddRefs(item));
}
}
}
}
else {
// don't check menulists as the selected item will be inside a popup.
nsCOMPtr<nsIDOMXULMenuListElement> menulist = do_QueryInterface(aCurrentEl);
if (!menulist) {
nsCOMPtr<nsIDOMXULSelectControlElement> select =
do_QueryInterface(aCurrentEl);
if (select) {
checkLineHeight = false;
select->GetSelectedItem(getter_AddRefs(item));
}
}
}
if (item)
focusedContent = do_QueryInterface(item);
#endif
nsIFrame *frame = focusedContent->GetPrimaryFrame();
if (frame) {
NS_ASSERTION(frame->PresContext() == GetPresContext(),
"handling event for focused content that is not in our document?");
nsPoint frameOrigin(0, 0);
// Get the frame's origin within its view
nsView *view = frame->GetClosestView(&frameOrigin);
NS_ASSERTION(view, "No view for frame");
// View's origin relative the widget
if (aRootWidget) {
frameOrigin += view->GetOffsetToWidget(aRootWidget);
}
// Start context menu down and to the right from top left of frame
// use the lineheight. This is a good distance to move the context
// menu away from the top left corner of the frame. If we always
// used the frame height, the context menu could end up far away,
// for example when we're focused on linked images.
// On the other hand, we want to use the frame height if it's less
// than the current line height, so that the context menu appears
// associated with the correct frame.
nscoord extra = 0;
if (!istree) {
extra = frame->GetSize().height;
if (checkLineHeight) {
nsIScrollableFrame *scrollFrame =
nsLayoutUtils::GetNearestScrollableFrame(frame);
if (scrollFrame) {
nsSize scrollAmount = scrollFrame->GetLineScrollAmount();
nsIFrame* f = do_QueryFrame(scrollFrame);
int32_t APD = presContext->AppUnitsPerDevPixel();
int32_t scrollAPD = f->PresContext()->AppUnitsPerDevPixel();
scrollAmount = scrollAmount.ScaleToOtherAppUnits(scrollAPD, APD);
if (extra > scrollAmount.height) {
extra = scrollAmount.height;
}
}
}
}
aTargetPt.x = presContext->AppUnitsToDevPixels(frameOrigin.x);
aTargetPt.y = presContext->AppUnitsToDevPixels(
frameOrigin.y + extra + extraTreeY);
}
NS_IF_ADDREF(*aTargetToUse = focusedContent);
}
bool
PresShell::ShouldIgnoreInvalidation()
{
return mPaintingSuppressed || !mIsActive || mIsNeverPainting;
}
void
PresShell::WillPaint()
{
// Check the simplest things first. In particular, it's important to
// check mIsActive before making any of the more expensive calls such
// as GetRootPresContext, for the case of a browser with a large
// number of tabs.
// Don't bother doing anything if some viewmanager in our tree is painting
// while we still have painting suppressed or we are not active.
if (!mIsActive || mPaintingSuppressed || !IsVisible()) {
return;
}
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (!rootPresContext) {
// In some edge cases, such as when we don't have a root frame yet,
// we can't find the root prescontext. There's nothing to do in that
// case.
return;
}
rootPresContext->FlushWillPaintObservers();
if (mIsDestroying)
return;
// Process reflows, if we have them, to reduce flicker due to invalidates and
// reflow being interspersed. Note that we _do_ allow this to be
// interruptible; if we can't do all the reflows it's better to flicker a bit
// than to freeze up.
FlushPendingNotifications(ChangesToFlush(Flush_InterruptibleLayout, false));
}
void
PresShell::WillPaintWindow()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. We don't allow plugins in popups
// so there's nothing to do here.
return;
}
#ifndef XP_MACOSX
rootPresContext->ApplyPluginGeometryUpdates();
#endif
}
void
PresShell::DidPaintWindow()
{
nsRootPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext != mPresContext) {
// This could be a popup's presshell. No point in notifying XPConnect
// about compositing of popups.
return;
}
if (!mHasReceivedPaintMessage) {
mHasReceivedPaintMessage = true;
nsCOMPtr<nsIObserverService> obsvc = services::GetObserverService();
if (obsvc && mDocument) {
nsPIDOMWindowOuter* window = mDocument->GetWindow();
nsCOMPtr<nsIDOMChromeWindow> chromeWin(do_QueryInterface(window));
if (chromeWin) {
obsvc->NotifyObservers(chromeWin, "widget-first-paint", nullptr);
}
}
}
}
bool
PresShell::IsVisible()
{
if (!mIsActive || !mViewManager)
return false;
nsView* view = mViewManager->GetRootView();
if (!view)
return true;
// inner view of subdoc frame
view = view->GetParent();
if (!view)
return true;
// subdoc view
view = view->GetParent();
if (!view)
return true;
nsIFrame* frame = view->GetFrame();
if (!frame)
return true;
return frame->IsVisibleConsideringAncestors(nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY);
}
nsresult
PresShell::GetAgentStyleSheets(nsTArray<StyleSheetHandle::RefPtr>& aSheets)
{
aSheets.Clear();
int32_t sheetCount = mStyleSet->SheetCount(SheetType::Agent);
if (!aSheets.SetCapacity(sheetCount, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (int32_t i = 0; i < sheetCount; ++i) {
StyleSheetHandle sheet = mStyleSet->StyleSheetAt(SheetType::Agent, i);
aSheets.AppendElement(sheet);
}
return NS_OK;
}
nsresult
PresShell::SetAgentStyleSheets(const nsTArray<StyleSheetHandle::RefPtr>& aSheets)
{
return mStyleSet->ReplaceSheets(SheetType::Agent, aSheets);
}
nsresult
PresShell::AddOverrideStyleSheet(StyleSheetHandle aSheet)
{
return mStyleSet->PrependStyleSheet(SheetType::Override, aSheet);
}
nsresult
PresShell::RemoveOverrideStyleSheet(StyleSheetHandle aSheet)
{
return mStyleSet->RemoveStyleSheet(SheetType::Override, aSheet);
}
static void
FreezeElement(nsISupports *aSupports, void * /* unused */)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->StopPluginInstance();
}
}
static bool
FreezeSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Freeze();
return true;
}
void
PresShell::Freeze()
{
mUpdateImageVisibilityEvent.Revoke();
MaybeReleaseCapturingContent();
mDocument->EnumerateActivityObservers(FreezeElement, nullptr);
if (mCaret) {
SetCaretEnabled(false);
}
mPaintingSuppressed = true;
if (mDocument) {
mDocument->EnumerateSubDocuments(FreezeSubDocument, nullptr);
}
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->Freeze();
}
mFrozen = true;
if (mDocument) {
UpdateImageLockingState();
}
}
void
PresShell::FireOrClearDelayedEvents(bool aFireEvents)
{
mNoDelayedMouseEvents = false;
mNoDelayedKeyEvents = false;
if (!aFireEvents) {
mDelayedEvents.Clear();
return;
}
if (mDocument) {
nsCOMPtr<nsIDocument> doc = mDocument;
while (!mIsDestroying && mDelayedEvents.Length() &&
!doc->EventHandlingSuppressed()) {
nsAutoPtr<DelayedEvent> ev(mDelayedEvents[0].forget());
mDelayedEvents.RemoveElementAt(0);
ev->Dispatch();
}
if (!doc->EventHandlingSuppressed()) {
mDelayedEvents.Clear();
}
}
}
static void
ThawElement(nsISupports *aSupports, void *aShell)
{
nsCOMPtr<nsIObjectLoadingContent> olc(do_QueryInterface(aSupports));
if (olc) {
olc->AsyncStartPluginInstance();
}
}
static bool
ThawSubDocument(nsIDocument *aDocument, void *aData)
{
nsIPresShell *shell = aDocument->GetShell();
if (shell)
shell->Thaw();
return true;
}
void
PresShell::Thaw()
{
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->Thaw();
}
mDocument->EnumerateActivityObservers(ThawElement, this);
if (mDocument)
mDocument->EnumerateSubDocuments(ThawSubDocument, nullptr);
// Get the activeness of our presshell, as this might have changed
// while we were in the bfcache
QueryIsActive();
// We're now unfrozen
mFrozen = false;
UpdateImageLockingState();
UnsuppressPainting();
}
//--------------------------------------------------------
// Start of protected and private methods on the PresShell
//--------------------------------------------------------
void
PresShell::MaybeScheduleReflow()
{
ASSERT_REFLOW_SCHEDULED_STATE();
if (mReflowScheduled || mIsDestroying || mIsReflowing ||
mDirtyRoots.Length() == 0)
return;
if (!mPresContext->HasPendingInterrupt() || !ScheduleReflowOffTimer()) {
ScheduleReflow();
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
void
PresShell::ScheduleReflow()
{
NS_PRECONDITION(!mReflowScheduled, "Why are we trying to schedule a reflow?");
ASSERT_REFLOW_SCHEDULED_STATE();
if (GetPresContext()->RefreshDriver()->AddLayoutFlushObserver(this)) {
mReflowScheduled = true;
}
ASSERT_REFLOW_SCHEDULED_STATE();
}
nsresult
PresShell::DidCauseReflow()
{
NS_ASSERTION(mChangeNestCount != 0, "Unexpected call to DidCauseReflow()");
--mChangeNestCount;
nsContentUtils::RemoveScriptBlocker();
return NS_OK;
}
void
PresShell::WillDoReflow()
{
mDocument->FlushUserFontSet();
mPresContext->FlushCounterStyles();
mFrameConstructor->BeginUpdate();
mLastReflowStart = GetPerformanceNow();
}
void
PresShell::DidDoReflow(bool aInterruptible)
{
mFrameConstructor->EndUpdate();
HandlePostedReflowCallbacks(aInterruptible);
nsCOMPtr<nsIDocShell> docShell = mPresContext->GetDocShell();
if (docShell) {
DOMHighResTimeStamp now = GetPerformanceNow();
docShell->NotifyReflowObservers(aInterruptible, mLastReflowStart, now);
}
if (sSynthMouseMove) {
SynthesizeMouseMove(false);
}
mPresContext->NotifyMissingFonts();
}
DOMHighResTimeStamp
PresShell::GetPerformanceNow()
{
DOMHighResTimeStamp now = 0;
if (nsPIDOMWindowInner* window = mDocument->GetInnerWindow()) {
nsPerformance* perf = window->GetPerformance();
if (perf) {
now = perf->Now();
}
}
return now;
}
void
PresShell::sReflowContinueCallback(nsITimer* aTimer, void* aPresShell)
{
RefPtr<PresShell> self = static_cast<PresShell*>(aPresShell);
NS_PRECONDITION(aTimer == self->mReflowContinueTimer, "Unexpected timer");
self->mReflowContinueTimer = nullptr;
self->ScheduleReflow();
}
bool
PresShell::ScheduleReflowOffTimer()
{
NS_PRECONDITION(!mReflowScheduled, "Shouldn't get here");
ASSERT_REFLOW_SCHEDULED_STATE();
if (!mReflowContinueTimer) {
mReflowContinueTimer = do_CreateInstance("@mozilla.org/timer;1");
if (!mReflowContinueTimer ||
NS_FAILED(mReflowContinueTimer->
InitWithFuncCallback(sReflowContinueCallback, this, 30,
nsITimer::TYPE_ONE_SHOT))) {
return false;
}
}
return true;
}
bool
PresShell::DoReflow(nsIFrame* target, bool aInterruptible)
{
if (mIsZombie) {
return true;
}
gfxTextPerfMetrics* tp = mPresContext->GetTextPerfMetrics();
TimeStamp timeStart;
if (tp) {
tp->Accumulate();
tp->reflowCount++;
timeStart = TimeStamp::Now();
}
target->SchedulePaint();
nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(target);
while (parent) {
nsSVGEffects::InvalidateDirectRenderingObservers(parent);
parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
}
nsAutoCString docURL("N/A");
nsIURI *uri = mDocument->GetDocumentURI();
if (uri)
uri->GetSpec(docURL);
PROFILER_LABEL_PRINTF("PresShell", "DoReflow",
js::ProfileEntry::Category::GRAPHICS, "(%s)", docURL.get());
nsDocShell* docShell = static_cast<nsDocShell*>(GetPresContext()->GetDocShell());
RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
bool isTimelineRecording = timelines && timelines->HasConsumer(docShell);
if (isTimelineRecording) {
timelines->AddMarkerForDocShell(docShell, "Reflow", MarkerTracingType::START);
}
if (mReflowContinueTimer) {
mReflowContinueTimer->Cancel();
mReflowContinueTimer = nullptr;
}
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
// CreateReferenceRenderingContext can return nullptr
nsRenderingContext rcx(CreateReferenceRenderingContext());
#ifdef DEBUG
mCurrentReflowRoot = target;
#endif
// If the target frame is the root of the frame hierarchy, then
// use all the available space. If it's simply a `reflow root',
// then use the target frame's size as the available space.
WritingMode wm = target->GetWritingMode();
LogicalSize size(wm);
if (target == rootFrame) {
size = LogicalSize(wm, mPresContext->GetVisibleArea().Size());
} else {
size = target->GetLogicalSize();
}
NS_ASSERTION(!target->GetNextInFlow() && !target->GetPrevInFlow(),
"reflow roots should never split");
// Don't pass size directly to the reflow state, since a
// constrained height implies page/column breaking.
LogicalSize reflowSize(wm, size.ISize(wm), NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState reflowState(mPresContext, target, &rcx, reflowSize,
nsHTMLReflowState::CALLER_WILL_INIT);
reflowState.mOrthogonalLimit = size.BSize(wm);
if (rootFrame == target) {
reflowState.Init(mPresContext);
// When the root frame is being reflowed with unconstrained block-size
// (which happens when we're called from
// nsDocumentViewer::SizeToContent), we're effectively doing a
// resize in the block direction, since it changes the meaning of
// percentage block-sizes even if no block-sizes actually changed.
// The same applies when we reflow again after that computation. This is
// an unusual case, and isn't caught by nsHTMLReflowState::InitResizeFlags.
bool hasUnconstrainedBSize = size.BSize(wm) == NS_UNCONSTRAINEDSIZE;
if (hasUnconstrainedBSize || mLastRootReflowHadUnconstrainedBSize) {
reflowState.SetVResize(true);
}
mLastRootReflowHadUnconstrainedBSize = hasUnconstrainedBSize;
} else {
// Initialize reflow state with current used border and padding,
// in case this was set specially by the parent frame when the reflow root
// was reflowed by its parent.
nsMargin currentBorder = target->GetUsedBorder();
nsMargin currentPadding = target->GetUsedPadding();
reflowState.Init(mPresContext, nullptr, &currentBorder, &currentPadding);
}
// fix the computed height
NS_ASSERTION(reflowState.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
"reflow state should not set margin for reflow roots");
if (size.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
nscoord computedBSize =
size.BSize(wm) - reflowState.ComputedLogicalBorderPadding().BStartEnd(wm);
computedBSize = std::max(computedBSize, 0);
reflowState.SetComputedBSize(computedBSize);
}
NS_ASSERTION(reflowState.ComputedISize() ==
size.ISize(wm) -
reflowState.ComputedLogicalBorderPadding().IStartEnd(wm),
"reflow state computed incorrect inline size");
mPresContext->ReflowStarted(aInterruptible);
mIsReflowing = true;
nsReflowStatus status;
nsHTMLReflowMetrics desiredSize(reflowState);
target->Reflow(mPresContext, desiredSize, reflowState, status);
// If an incremental reflow is initiated at a frame other than the
// root frame, then its desired size had better not change! If it's
// initiated at the root, then the size better not change unless its
// height was unconstrained to start with.
nsRect boundsRelativeToTarget = nsRect(0, 0, desiredSize.Width(), desiredSize.Height());
NS_ASSERTION((target == rootFrame &&
size.BSize(wm) == NS_UNCONSTRAINEDSIZE) ||
(desiredSize.ISize(wm) == size.ISize(wm) &&
desiredSize.BSize(wm) == size.BSize(wm)),
"non-root frame's desired size changed during an "
"incremental reflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.VisualOverflow().IsEqualInterior(boundsRelativeToTarget),
"non-root reflow roots must not have visible overflow");
NS_ASSERTION(target == rootFrame ||
desiredSize.ScrollableOverflow().IsEqualEdges(boundsRelativeToTarget),
"non-root reflow roots must not have scrollable overflow");
NS_ASSERTION(status == NS_FRAME_COMPLETE,
"reflow roots should never split");
target->SetSize(boundsRelativeToTarget.Size());
// Always use boundsRelativeToTarget here, not desiredSize.GetVisualOverflowArea(),
// because for root frames (where they could be different, since root frames
// are allowed to have overflow) the root view bounds need to match the
// viewport bounds; the view manager "window dimensions" code depends on it.
nsContainerFrame::SyncFrameViewAfterReflow(mPresContext, target,
target->GetView(),
boundsRelativeToTarget);
nsContainerFrame::SyncWindowProperties(mPresContext, target,
target->GetView(), &rcx,
nsContainerFrame::SET_ASYNC);
target->DidReflow(mPresContext, nullptr, nsDidReflowStatus::FINISHED);
if (target == rootFrame && size.BSize(wm) == NS_UNCONSTRAINEDSIZE) {
mPresContext->SetVisibleArea(boundsRelativeToTarget);
}
#ifdef DEBUG
mCurrentReflowRoot = nullptr;
#endif
NS_ASSERTION(mPresContext->HasPendingInterrupt() ||
mFramesToDirty.Count() == 0,
"Why do we need to dirty anything if not interrupted?");
mIsReflowing = false;
bool interrupted = mPresContext->HasPendingInterrupt();
if (interrupted) {
// Make sure target gets reflowed again.
for (auto iter = mFramesToDirty.Iter(); !iter.Done(); iter.Next()) {
// Mark frames dirty until target frame.
nsPtrHashKey<nsIFrame>* p = iter.Get();
for (nsIFrame* f = p->GetKey();
f && !NS_SUBTREE_DIRTY(f);
f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
if (f == target) {
break;
}
}
}
NS_ASSERTION(NS_SUBTREE_DIRTY(target), "Why is the target not dirty?");
mDirtyRoots.AppendElement(target);
mDocument->SetNeedLayoutFlush();
// Clear mFramesToDirty after we've done the NS_SUBTREE_DIRTY(target)
// assertion so that if it fails it's easier to see what's going on.
#ifdef NOISY_INTERRUPTIBLE_REFLOW
printf("mFramesToDirty.Count() == %u\n", mFramesToDirty.Count());
#endif /* NOISY_INTERRUPTIBLE_REFLOW */
mFramesToDirty.Clear();
// Any FlushPendingNotifications with interruptible reflows
// should be suppressed now. We don't want to do extra reflow work
// before our reflow event happens.
mSuppressInterruptibleReflows = true;
MaybeScheduleReflow();
}
// dump text perf metrics for reflows with significant text processing
if (tp) {
if (tp->current.numChars > 100) {
TimeDuration reflowTime = TimeStamp::Now() - timeStart;
LogTextPerfStats(tp, this, tp->current,
reflowTime.ToMilliseconds(), eLog_reflow, nullptr);
}
tp->Accumulate();
}
if (isTimelineRecording) {
timelines->AddMarkerForDocShell(docShell, "Reflow", MarkerTracingType::END);
}
return !interrupted;
}
#ifdef DEBUG
void
PresShell::DoVerifyReflow()
{
if (GetVerifyReflowEnable()) {
// First synchronously render what we have so far so that we can
// see it.
nsView* rootView = mViewManager->GetRootView();
mViewManager->InvalidateView(rootView);
FlushPendingNotifications(Flush_Layout);
mInVerifyReflow = true;
bool ok = VerifyIncrementalReflow();
mInVerifyReflow = false;
if (VERIFY_REFLOW_ALL & gVerifyReflowFlags) {
printf("ProcessReflowCommands: finished (%s)\n",
ok ? "ok" : "failed");
}
if (!mDirtyRoots.IsEmpty()) {
printf("XXX yikes! reflow commands queued during verify-reflow\n");
}
}
}
#endif
// used with Telemetry metrics
#define NS_LONG_REFLOW_TIME_MS 5000
bool
PresShell::ProcessReflowCommands(bool aInterruptible)
{
if (mDirtyRoots.IsEmpty() && !mShouldUnsuppressPainting) {
// Nothing to do; bail out
return true;
}
mozilla::TimeStamp timerStart = mozilla::TimeStamp::Now();
bool interrupted = false;
if (!mDirtyRoots.IsEmpty()) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("ProcessReflowCommands: begin incremental reflow\n");
}
#endif
// If reflow is interruptible, then make a note of our deadline.
const PRIntervalTime deadline = aInterruptible
? PR_IntervalNow() + PR_MicrosecondsToInterval(gMaxRCProcessingTime)
: (PRIntervalTime)0;
// Scope for the reflow entry point
{
nsAutoScriptBlocker scriptBlocker;
WillDoReflow();
AUTO_LAYOUT_PHASE_ENTRY_POINT(GetPresContext(), Reflow);
nsViewManager::AutoDisableRefresh refreshBlocker(mViewManager);
do {
// Send an incremental reflow notification to the target frame.
int32_t idx = mDirtyRoots.Length() - 1;
nsIFrame *target = mDirtyRoots[idx];
mDirtyRoots.RemoveElementAt(idx);
if (!NS_SUBTREE_DIRTY(target)) {
// It's not dirty anymore, which probably means the notification
// was posted in the middle of a reflow (perhaps with a reflow
// root in the middle). Don't do anything.
continue;
}
interrupted = !DoReflow(target, aInterruptible);
// Keep going until we're out of reflow commands, or we've run
// past our deadline, or we're interrupted.
} while (!interrupted && !mDirtyRoots.IsEmpty() &&
(!aInterruptible || PR_IntervalNow() < deadline));
interrupted = !mDirtyRoots.IsEmpty();
}
// Exiting the scriptblocker might have killed us
if (!mIsDestroying) {
DidDoReflow(aInterruptible);
}
// DidDoReflow might have killed us
if (!mIsDestroying) {
#ifdef DEBUG
if (VERIFY_REFLOW_DUMP_COMMANDS & gVerifyReflowFlags) {
printf("\nPresShell::ProcessReflowCommands() finished: this=%p\n",
(void*)this);
}
DoVerifyReflow();
#endif
// If any new reflow commands were enqueued during the reflow, schedule
// another reflow event to process them. Note that we want to do this
// after DidDoReflow(), since that method can change whether there are
// dirty roots around by flushing, and there's no point in posting a
// reflow event just to have the flush revoke it.
if (!mDirtyRoots.IsEmpty()) {
MaybeScheduleReflow();
// And tell our document that we might need flushing
mDocument->SetNeedLayoutFlush();
}
}
}
if (!mIsDestroying && mShouldUnsuppressPainting &&
mDirtyRoots.IsEmpty()) {
// We only unlock if we're out of reflows. It's pointless
// to unlock if reflows are still pending, since reflows
// are just going to thrash the frames around some more. By
// waiting we avoid an overeager "jitter" effect.
mShouldUnsuppressPainting = false;
UnsuppressAndInvalidate();
}
if (mDocument->GetRootElement()) {
TimeDuration elapsed = TimeStamp::Now() - timerStart;
int32_t intElapsed = int32_t(elapsed.ToMilliseconds());
Telemetry::ID id;
if (mDocument->GetRootElement()->IsXULElement()) {
id = mIsActive
? Telemetry::XUL_FOREGROUND_REFLOW_MS
: Telemetry::XUL_BACKGROUND_REFLOW_MS;
} else {
id = mIsActive
? Telemetry::HTML_FOREGROUND_REFLOW_MS_2
: Telemetry::HTML_BACKGROUND_REFLOW_MS_2;
}
Telemetry::Accumulate(id, intElapsed);
if (intElapsed > NS_LONG_REFLOW_TIME_MS) {
Telemetry::Accumulate(Telemetry::LONG_REFLOW_INTERRUPTIBLE,
aInterruptible ? 1 : 0);
}
}
return !interrupted;
}
void
PresShell::WindowSizeMoveDone()
{
if (mPresContext) {
EventStateManager::ClearGlobalActiveContent(nullptr);
ClearMouseCapture(nullptr);
}
}
#ifdef MOZ_XUL
/*
* It's better to add stuff to the |DidSetStyleContext| method of the
* relevant frames than adding it here. These methods should (ideally,
* anyway) go away.
*/
// Return value says whether to walk children.
typedef bool (* frameWalkerFn)(nsIFrame *aFrame, void *aClosure);
static bool
ReResolveMenusAndTrees(nsIFrame *aFrame, void *aClosure)
{
// Trees have a special style cache that needs to be flushed when
// the theme changes.
nsTreeBodyFrame *treeBody = do_QueryFrame(aFrame);
if (treeBody)
treeBody->ClearStyleAndImageCaches();
// We deliberately don't re-resolve style on a menu's popup
// sub-content, since doing so slows menus to a crawl. That means we
// have to special-case them on a skin switch, and ensure that the
// popup frames just get destroyed completely.
nsMenuFrame* menu = do_QueryFrame(aFrame);
if (menu)
menu->CloseMenu(true);
return true;
}
static bool
ReframeImageBoxes(nsIFrame *aFrame, void *aClosure)
{
nsStyleChangeList *list = static_cast<nsStyleChangeList*>(aClosure);
if (aFrame->GetType() == nsGkAtoms::imageBoxFrame) {
list->AppendChange(aFrame, aFrame->GetContent(),
NS_STYLE_HINT_FRAMECHANGE);
return false; // don't walk descendants
}
return true; // walk descendants
}
static void
WalkFramesThroughPlaceholders(nsPresContext *aPresContext, nsIFrame *aFrame,
frameWalkerFn aFunc, void *aClosure)
{
bool walkChildren = (*aFunc)(aFrame, aClosure);
if (!walkChildren)
return;
nsIFrame::ChildListIterator lists(aFrame);
for (; !lists.IsDone(); lists.Next()) {
nsFrameList::Enumerator childFrames(lists.CurrentList());
for (; !childFrames.AtEnd(); childFrames.Next()) {
nsIFrame* child = childFrames.get();
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
// only do frames that are in flow, and recur through the
// out-of-flows of placeholders.
WalkFramesThroughPlaceholders(aPresContext,
nsPlaceholderFrame::GetRealFrameFor(child),
aFunc, aClosure);
}
}
}
}
#endif
NS_IMETHODIMP
PresShell::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (mIsDestroying) {
NS_WARNING("our observers should have been unregistered by now");
return NS_OK;
}
#ifdef MOZ_XUL
if (!nsCRT::strcmp(aTopic, "chrome-flush-skin-caches")) {
nsIFrame *rootFrame = mFrameConstructor->GetRootFrame();
// Need to null-check because "chrome-flush-skin-caches" can happen
// at interesting times during startup.
if (rootFrame) {
NS_ASSERTION(mViewManager, "View manager must exist");
nsWeakFrame weakRoot(rootFrame);
// Have to make sure that the content notifications are flushed before we
// start messing with the frame model; otherwise we can get content doubling.
mDocument->FlushPendingNotifications(Flush_ContentAndNotify);
if (weakRoot.IsAlive()) {
WalkFramesThroughPlaceholders(mPresContext, rootFrame,
&ReResolveMenusAndTrees, nullptr);
// Because "chrome:" URL equality is messy, reframe image box
// frames (hack!).
nsStyleChangeList changeList;
WalkFramesThroughPlaceholders(mPresContext, rootFrame,
ReframeImageBoxes, &changeList);
// Mark ourselves as not safe to flush while we're doing frame
// construction.
{
nsAutoScriptBlocker scriptBlocker;
++mChangeNestCount;
RestyleManagerHandle restyleManager = mPresContext->RestyleManager();
if (restyleManager->IsServo()) {
MOZ_CRASH("stylo: PresShell::Observe(\"chrome-flush-skin-caches\") "
"not implemented for Servo-backed style system");
}
restyleManager->AsGecko()->ProcessRestyledFrames(changeList);
restyleManager->AsGecko()->FlushOverflowChangedTracker();
--mChangeNestCount;
}
}
}
return NS_OK;
}
#endif
if (!nsCRT::strcmp(aTopic, "agent-sheet-added")) {
if (mStyleSet) {
AddAgentSheet(aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "user-sheet-added")) {
if (mStyleSet) {
AddUserSheet(aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "author-sheet-added")) {
if (mStyleSet) {
AddAuthorSheet(aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "agent-sheet-removed")) {
if (mStyleSet) {
RemoveSheet(SheetType::Agent, aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "user-sheet-removed")) {
if (mStyleSet) {
RemoveSheet(SheetType::User, aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "author-sheet-removed")) {
if (mStyleSet) {
RemoveSheet(SheetType::Doc, aSubject);
}
return NS_OK;
}
if (!nsCRT::strcmp(aTopic, "memory-pressure")) {
if (!AssumeAllImagesVisible() && mPresContext->IsRootContentDocument()) {
DoUpdateImageVisibility(/* aRemoveOnly = */ true);
}
return NS_OK;
}
NS_WARNING("unrecognized topic in PresShell::Observe");
return NS_ERROR_FAILURE;
}
bool
nsIPresShell::AddRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->AddRefreshObserver(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::AddRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
return AddRefreshObserverInternal(aObserver, aFlushType);
}
bool
nsIPresShell::RemoveRefreshObserverInternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
nsPresContext* presContext = GetPresContext();
return presContext &&
presContext->RefreshDriver()->RemoveRefreshObserver(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::RemoveRefreshObserverExternal(nsARefreshObserver* aObserver,
mozFlushType aFlushType)
{
return RemoveRefreshObserverInternal(aObserver, aFlushType);
}
/* virtual */ bool
nsIPresShell::AddPostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->AddPostRefreshObserver(aObserver);
return true;
}
/* virtual */ bool
nsIPresShell::RemovePostRefreshObserver(nsAPostRefreshObserver* aObserver)
{
nsPresContext* presContext = GetPresContext();
if (!presContext) {
return false;
}
presContext->RefreshDriver()->RemovePostRefreshObserver(aObserver);
return true;
}
//------------------------------------------------------
// End of protected and private methods on the PresShell
//------------------------------------------------------
//------------------------------------------------------------------
//-- Delayed event Classes Impls
//------------------------------------------------------------------
PresShell::DelayedInputEvent::DelayedInputEvent() :
DelayedEvent(),
mEvent(nullptr)
{
}
PresShell::DelayedInputEvent::~DelayedInputEvent()
{
delete mEvent;
}
void
PresShell::DelayedInputEvent::Dispatch()
{
if (!mEvent || !mEvent->widget) {
return;
}
nsCOMPtr<nsIWidget> widget = mEvent->widget;
nsEventStatus status;
widget->DispatchEvent(mEvent, status);
}
PresShell::DelayedMouseEvent::DelayedMouseEvent(WidgetMouseEvent* aEvent) :
DelayedInputEvent()
{
WidgetMouseEvent* mouseEvent =
new WidgetMouseEvent(aEvent->mFlags.mIsTrusted,
aEvent->mMessage,
aEvent->widget,
aEvent->reason,
aEvent->context);
mouseEvent->AssignMouseEventData(*aEvent, false);
mEvent = mouseEvent;
}
PresShell::DelayedKeyEvent::DelayedKeyEvent(WidgetKeyboardEvent* aEvent) :
DelayedInputEvent()
{
WidgetKeyboardEvent* keyEvent =
new WidgetKeyboardEvent(aEvent->mFlags.mIsTrusted,
aEvent->mMessage,
aEvent->widget);
keyEvent->AssignKeyEventData(*aEvent, false);
keyEvent->mFlags.mIsSynthesizedForTests = aEvent->mFlags.mIsSynthesizedForTests;
mEvent = keyEvent;
}
// Start of DEBUG only code
#ifdef DEBUG
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg)
{
nsAutoString n1, n2;
if (k1) {
k1->GetFrameName(n1);
} else {
n1.AssignLiteral(MOZ_UTF16("(null)"));
}
if (k2) {
k2->GetFrameName(n2);
} else {
n2.AssignLiteral(MOZ_UTF16("(null)"));
}
printf("verifyreflow: %s %p != %s %p %s\n",
NS_LossyConvertUTF16toASCII(n1).get(), (void*)k1,
NS_LossyConvertUTF16toASCII(n2).get(), (void*)k2, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsRect& r1, const nsRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static void
LogVerifyMessage(nsIFrame* k1, nsIFrame* k2, const char* aMsg,
const nsIntRect& r1, const nsIntRect& r2)
{
printf("VerifyReflow Error:\n");
nsAutoString name;
if (k1) {
k1->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k1);
}
printf("{%d, %d, %d, %d} != \n", r1.x, r1.y, r1.width, r1.height);
if (k2) {
k2->GetFrameName(name);
printf(" %s %p ", NS_LossyConvertUTF16toASCII(name).get(), (void*)k2);
}
printf("{%d, %d, %d, %d}\n %s\n",
r2.x, r2.y, r2.width, r2.height, aMsg);
}
static bool
CompareTrees(nsPresContext* aFirstPresContext, nsIFrame* aFirstFrame,
nsPresContext* aSecondPresContext, nsIFrame* aSecondFrame)
{
if (!aFirstPresContext || !aFirstFrame || !aSecondPresContext || !aSecondFrame)
return true;
// XXX Evil hack to reduce false positives; I can't seem to figure
// out how to flush scrollbar changes correctly
//if (aFirstFrame->GetType() == nsGkAtoms::scrollbarFrame)
// return true;
bool ok = true;
nsIFrame::ChildListIterator lists1(aFirstFrame);
nsIFrame::ChildListIterator lists2(aSecondFrame);
do {
const nsFrameList& kids1 = !lists1.IsDone() ? lists1.CurrentList() : nsFrameList();
const nsFrameList& kids2 = !lists2.IsDone() ? lists2.CurrentList() : nsFrameList();
int32_t l1 = kids1.GetLength();
int32_t l2 = kids2.GetLength();
if (l1 != l2) {
ok = false;
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child counts don't match: ");
printf("%d != %d\n", l1, l2);
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
LayoutDeviceIntRect r1, r2;
nsView* v1;
nsView* v2;
for (nsFrameList::Enumerator e1(kids1), e2(kids2);
;
e1.Next(), e2.Next()) {
nsIFrame* k1 = e1.get();
nsIFrame* k2 = e2.get();
if (((nullptr == k1) && (nullptr != k2)) ||
((nullptr != k1) && (nullptr == k2))) {
ok = false;
LogVerifyMessage(k1, k2, "child lists are different\n");
break;
}
else if (nullptr != k1) {
// Verify that the frames are the same size
if (!k1->GetRect().IsEqualInterior(k2->GetRect())) {
ok = false;
LogVerifyMessage(k1, k2, "(frame rects)", k1->GetRect(), k2->GetRect());
}
// Make sure either both have views or neither have views; if they
// do have views, make sure the views are the same size. If the
// views have widgets, make sure they both do or neither does. If
// they do, make sure the widgets are the same size.
v1 = k1->GetView();
v2 = k2->GetView();
if (((nullptr == v1) && (nullptr != v2)) ||
((nullptr != v1) && (nullptr == v2))) {
ok = false;
LogVerifyMessage(k1, k2, "child views are not matched\n");
}
else if (nullptr != v1) {
if (!v1->GetBounds().IsEqualInterior(v2->GetBounds())) {
LogVerifyMessage(k1, k2, "(view rects)", v1->GetBounds(), v2->GetBounds());
}
nsIWidget* w1 = v1->GetWidget();
nsIWidget* w2 = v2->GetWidget();
if (((nullptr == w1) && (nullptr != w2)) ||
((nullptr != w1) && (nullptr == w2))) {
ok = false;
LogVerifyMessage(k1, k2, "child widgets are not matched\n");
}
else if (nullptr != w1) {
w1->GetBounds(r1);
w2->GetBounds(r2);
if (!r1.IsEqualEdges(r2)) {
LogVerifyMessage(k1, k2, "(widget rects)",
r1.ToUnknownRect(), r2.ToUnknownRect());
}
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
// XXX Should perhaps compare their float managers.
// Compare the sub-trees too
if (!CompareTrees(aFirstPresContext, k1, aSecondPresContext, k2)) {
ok = false;
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
break;
}
}
}
else {
break;
}
}
if (!ok && (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags))) {
break;
}
lists1.Next();
lists2.Next();
if (lists1.IsDone() != lists2.IsDone() ||
(!lists1.IsDone() && lists1.CurrentID() != lists2.CurrentID())) {
if (0 == (VERIFY_REFLOW_ALL & gVerifyReflowFlags)) {
ok = false;
}
LogVerifyMessage(kids1.FirstChild(), kids2.FirstChild(),
"child list names are not matched: ");
fprintf(stdout, "%s != %s\n",
!lists1.IsDone() ? mozilla::layout::ChildListName(lists1.CurrentID()) : "(null)",
!lists2.IsDone() ? mozilla::layout::ChildListName(lists2.CurrentID()) : "(null)");
break;
}
} while (ok && !lists1.IsDone());
return ok;
}
#endif
#if 0
static nsIFrame*
FindTopFrame(nsIFrame* aRoot)
{
if (aRoot) {
nsIContent* content = aRoot->GetContent();
if (content) {
nsIAtom* tag;
content->GetTag(tag);
if (nullptr != tag) {
NS_RELEASE(tag);
return aRoot;
}
}
// Try one of the children
for (nsIFrame* kid : aRoot->PrincipalChildList()) {
nsIFrame* result = FindTopFrame(kid);
if (nullptr != result) {
return result;
}
}
}
return nullptr;
}
#endif
#ifdef DEBUG
nsStyleSet*
PresShell::CloneStyleSet(nsStyleSet* aSet)
{
nsStyleSet* clone = new nsStyleSet();
int32_t i, n = aSet->SheetCount(SheetType::Override);
for (i = 0; i < n; i++) {
CSSStyleSheet* ss = aSet->StyleSheetAt(SheetType::Override, i);
if (ss)
clone->AppendStyleSheet(SheetType::Override, ss);
}
// The document expects to insert document stylesheets itself
#if 0
n = aSet->SheetCount(SheetType::Doc);
for (i = 0; i < n; i++) {
CSSStyleSheet* ss = aSet->StyleSheetAt(SheetType::Doc, i);
if (ss)
clone->AddDocStyleSheet(ss, mDocument);
}
#endif
n = aSet->SheetCount(SheetType::User);
for (i = 0; i < n; i++) {
CSSStyleSheet* ss = aSet->StyleSheetAt(SheetType::User, i);
if (ss)
clone->AppendStyleSheet(SheetType::User, ss);
}
n = aSet->SheetCount(SheetType::Agent);
for (i = 0; i < n; i++) {
CSSStyleSheet* ss = aSet->StyleSheetAt(SheetType::Agent, i);
if (ss)
clone->AppendStyleSheet(SheetType::Agent, ss);
}
return clone;
}
// After an incremental reflow, we verify the correctness by doing a
// full reflow into a fresh frame tree.
bool
PresShell::VerifyIncrementalReflow()
{
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Building Verification Tree...\n");
}
// Create a presentation context to view the new frame tree
RefPtr<nsPresContext> cx =
new nsRootPresContext(mDocument, mPresContext->IsPaginated() ?
nsPresContext::eContext_PrintPreview :
nsPresContext::eContext_Galley);
NS_ENSURE_TRUE(cx, false);
nsDeviceContext *dc = mPresContext->DeviceContext();
nsresult rv = cx->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Get our scrolling preference
nsView* rootView = mViewManager->GetRootView();
NS_ENSURE_TRUE(rootView->HasWidget(), false);
nsIWidget* parentWidget = rootView->GetWidget();
// Create a new view manager.
RefPtr<nsViewManager> vm = new nsViewManager();
NS_ENSURE_TRUE(vm, false);
rv = vm->Init(dc);
NS_ENSURE_SUCCESS(rv, false);
// Create a child window of the parent that is our "root view/window"
// Create a view
nsRect tbounds = mPresContext->GetVisibleArea();
nsView* view = vm->CreateView(tbounds, nullptr);
NS_ENSURE_TRUE(view, false);
//now create the widget for the view
rv = view->CreateWidgetForParent(parentWidget, nullptr, true);
NS_ENSURE_SUCCESS(rv, false);
// Setup hierarchical relationship in view manager
vm->SetRootView(view);
// Make the new presentation context the same size as our
// presentation context.
nsRect r = mPresContext->GetVisibleArea();
cx->SetVisibleArea(r);
// Create a new presentation shell to view the document. Use the
// exact same style information that this document has.
if (mStyleSet->IsServo()) {
NS_WARNING("VerifyIncrementalReflow cannot handle ServoStyleSets");
return true;
}
nsAutoPtr<nsStyleSet> newSet(CloneStyleSet(mStyleSet->AsGecko()));
nsCOMPtr<nsIPresShell> sh = mDocument->CreateShell(cx, vm, newSet.get());
NS_ENSURE_TRUE(sh, false);
newSet.forget();
// Note that after we create the shell, we must make sure to destroy it
sh->SetVerifyReflowEnable(false); // turn off verify reflow while we're reflowing the test frame tree
vm->SetPresShell(sh);
{
nsAutoCauseReflowNotifier crNotifier(this);
sh->Initialize(r.width, r.height);
}
mDocument->BindingManager()->ProcessAttachedQueue();
sh->FlushPendingNotifications(Flush_Layout);
sh->SetVerifyReflowEnable(true); // turn on verify reflow again now that we're done reflowing the test frame tree
// Force the non-primary presshell to unsuppress; it doesn't want to normally
// because it thinks it's hidden
((PresShell*)sh.get())->mPaintingSuppressed = false;
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Verification Tree built, comparing...\n");
}
// Now that the document has been reflowed, use its frame tree to
// compare against our frame tree.
nsIFrame* root1 = mFrameConstructor->GetRootFrame();
nsIFrame* root2 = sh->GetRootFrame();
bool ok = CompareTrees(mPresContext, root1, cx, root2);
if (!ok && (VERIFY_REFLOW_NOISY & gVerifyReflowFlags)) {
printf("Verify reflow failed, primary tree:\n");
root1->List(stdout, 0);
printf("Verification tree:\n");
root2->List(stdout, 0);
}
#if 0
// Sample code for dumping page to png
// XXX Needs to be made more flexible
if (!ok) {
nsString stra;
static int num = 0;
stra.AppendLiteral("C:\\mozilla\\mozilla\\debug\\filea");
stra.AppendInt(num);
stra.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, stra);
nsString strb;
strb.AppendLiteral("C:\\mozilla\\mozilla\\debug\\fileb");
strb.AppendInt(num);
strb.AppendLiteral(".png");
gfxUtils::WriteAsPNG(sh, strb);
++num;
}
#endif
sh->EndObservingDocument();
sh->Destroy();
if (VERIFY_REFLOW_NOISY & gVerifyReflowFlags) {
printf("Finished Verifying Reflow...\n");
}
return ok;
}
// Layout debugging hooks
void
PresShell::ListStyleContexts(nsIFrame *aRootFrame, FILE *out, int32_t aIndent)
{
nsStyleContext *sc = aRootFrame->StyleContext();
if (sc)
sc->List(out, aIndent);
}
void
PresShell::ListStyleSheets(FILE *out, int32_t aIndent)
{
int32_t sheetCount = mStyleSet->SheetCount(SheetType::Doc);
for (int32_t i = 0; i < sheetCount; ++i) {
mStyleSet->StyleSheetAt(SheetType::Doc, i)->List(out, aIndent);
fputs("\n", out);
}
}
void
PresShell::VerifyStyleTree()
{
VERIFY_STYLE_TREE;
}
#endif
//=============================================================
//=============================================================
//-- Debug Reflow Counts
//=============================================================
//=============================================================
#ifdef MOZ_REFLOW_PERF
//-------------------------------------------------------------
void
PresShell::DumpReflows()
{
if (mReflowCountMgr) {
nsAutoCString uriStr;
if (mDocument) {
nsIURI *uri = mDocument->GetDocumentURI();
if (uri) {
uri->GetPath(uriStr);
}
}
mReflowCountMgr->DisplayTotals(uriStr.get());
mReflowCountMgr->DisplayHTMLTotals(uriStr.get());
mReflowCountMgr->DisplayDiffsInTotals();
}
}
//-------------------------------------------------------------
void
PresShell::CountReflows(const char * aName, nsIFrame * aFrame)
{
if (mReflowCountMgr) {
mReflowCountMgr->Add(aName, aFrame);
}
}
//-------------------------------------------------------------
void
PresShell::PaintCount(const char * aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame * aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mReflowCountMgr) {
mReflowCountMgr->PaintCount(aName, aRenderingContext, aPresContext,
aFrame, aOffset, aColor);
}
}
//-------------------------------------------------------------
void
PresShell::SetPaintFrameCount(bool aPaintFrameCounts)
{
if (mReflowCountMgr) {
mReflowCountMgr->SetPaintFrameCounts(aPaintFrameCounts);
}
}
bool
PresShell::IsPaintingFrameCounts()
{
if (mReflowCountMgr)
return mReflowCountMgr->IsPaintingFrameCounts();
return false;
}
//------------------------------------------------------------------
//-- Reflow Counter Classes Impls
//------------------------------------------------------------------
//------------------------------------------------------------------
ReflowCounter::ReflowCounter(ReflowCountMgr * aMgr) :
mMgr(aMgr)
{
ClearTotals();
SetTotalsCache();
}
//------------------------------------------------------------------
ReflowCounter::~ReflowCounter()
{
}
//------------------------------------------------------------------
void ReflowCounter::ClearTotals()
{
mTotal = 0;
}
//------------------------------------------------------------------
void ReflowCounter::SetTotalsCache()
{
mCacheTotal = mTotal;
}
//------------------------------------------------------------------
void ReflowCounter::CalcDiffInTotals()
{
mCacheTotal = mTotal - mCacheTotal;
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(const char * aStr)
{
DisplayTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayDiffTotals(const char * aStr)
{
DisplayTotals(mCacheTotal, aStr?aStr:"Diff Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(const char * aStr)
{
DisplayHTMLTotals(mTotal, aStr?aStr:"Totals");
}
//------------------------------------------------------------------
void ReflowCounter::DisplayTotals(uint32_t aTotal, const char * aTitle)
{
// figure total
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
printf("%25s\t", aTitle);
printf("%d\t", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
void ReflowCounter::DisplayHTMLTotals(uint32_t aTotal, const char * aTitle)
{
if (aTotal == 0) {
return;
}
ReflowCounter * gTots = (ReflowCounter *)mMgr->LookUp(kGrandTotalsStr);
FILE * fd = mMgr->GetOutFile();
if (!fd) {
return;
}
fprintf(fd, "<tr><td><center>%s</center></td>", aTitle);
fprintf(fd, "<td><center>%d</center></td></tr>\n", aTotal);
if (gTots != this && aTotal > 0) {
gTots->Add(aTotal);
}
}
//------------------------------------------------------------------
//-- ReflowCountMgr
//------------------------------------------------------------------
#define KEY_BUF_SIZE_FOR_PTR 24 // adequate char[] buffer to sprintf a pointer
ReflowCountMgr::ReflowCountMgr()
{
mCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
PL_CompareValues, nullptr, nullptr);
mIndiFrameCounts = PL_NewHashTable(10, PL_HashString, PL_CompareStrings,
PL_CompareValues, nullptr, nullptr);
mCycledOnce = false;
mDumpFrameCounts = false;
mDumpFrameByFrameCounts = false;
mPaintFrameByFrameCounts = false;
}
//------------------------------------------------------------------
ReflowCountMgr::~ReflowCountMgr()
{
CleanUp();
}
//------------------------------------------------------------------
ReflowCounter * ReflowCountMgr::LookUp(const char * aName)
{
if (nullptr != mCounts) {
ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
return counter;
}
return nullptr;
}
//------------------------------------------------------------------
void ReflowCountMgr::Add(const char * aName, nsIFrame * aFrame)
{
NS_ASSERTION(aName != nullptr, "Name shouldn't be null!");
if (mDumpFrameCounts && nullptr != mCounts) {
ReflowCounter * counter = (ReflowCounter *)PL_HashTableLookup(mCounts, aName);
if (counter == nullptr) {
counter = new ReflowCounter(this);
char * name = NS_strdup(aName);
NS_ASSERTION(name != nullptr, "null ptr");
PL_HashTableAdd(mCounts, name, counter);
}
counter->Add();
}
if ((mDumpFrameByFrameCounts || mPaintFrameByFrameCounts) &&
nullptr != mIndiFrameCounts &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
snprintf_literal(key, "%p", (void*)aFrame);
IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
if (counter == nullptr) {
counter = new IndiReflowCounter(this);
counter->mFrame = aFrame;
counter->mName.AssignASCII(aName);
PL_HashTableAdd(mIndiFrameCounts, NS_strdup(key), counter);
}
// this eliminates extra counts from super classes
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
counter->mCount++;
counter->mCounter.Add(1);
}
}
}
//------------------------------------------------------------------
void ReflowCountMgr::PaintCount(const char* aName,
nsRenderingContext* aRenderingContext,
nsPresContext* aPresContext,
nsIFrame* aFrame,
const nsPoint& aOffset,
uint32_t aColor)
{
if (mPaintFrameByFrameCounts &&
nullptr != mIndiFrameCounts &&
aFrame != nullptr) {
char key[KEY_BUF_SIZE_FOR_PTR];
snprintf_literal(key, "%p", (void*)aFrame);
IndiReflowCounter * counter =
(IndiReflowCounter *)PL_HashTableLookup(mIndiFrameCounts, key);
if (counter != nullptr && counter->mName.EqualsASCII(aName)) {
DrawTarget* drawTarget = aRenderingContext->GetDrawTarget();
int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
aRenderingContext->ThebesContext()->Save();
gfxPoint devPixelOffset =
nsLayoutUtils::PointToGfxPoint(aOffset, appUnitsPerDevPixel);
aRenderingContext->ThebesContext()->SetMatrix(
aRenderingContext->ThebesContext()->CurrentMatrix().Translate(devPixelOffset));
// We don't care about the document language or user fonts here;
// just get a default Latin font.
nsFont font(eFamily_serif, nsPresContext::CSSPixelsToAppUnits(11));
nsFontMetrics::Params params;
params.language = nsGkAtoms::x_western;
params.textPerf = aPresContext->GetTextPerfMetrics();
RefPtr<nsFontMetrics> fm =
aPresContext->DeviceContext()->GetMetricsFor(font, params);
char buf[16];
int len = snprintf_literal(buf, "%d", counter->mCount);
nscoord x = 0, y = fm->MaxAscent();
nscoord width, height = fm->MaxHeight();
fm->SetTextRunRTL(false);
width = fm->GetWidth(buf, len, drawTarget);
Color color;
Color color2;
if (aColor != 0) {
color = Color::FromABGR(aColor);
color2 = Color(0.f, 0.f, 0.f);
} else {
gfx::Float rc = 0.f, gc = 0.f, bc = 0.f;
if (counter->mCount < 5) {
rc = 1.f;
gc = 1.f;
} else if (counter->mCount < 11) {
gc = 1.f;
} else {
rc = 1.f;
}
color = Color(rc, gc, bc);
color2 = Color(rc/2, gc/2, bc/2);
}
nsRect rect(0,0, width+15, height+15);
Rect devPxRect =
NSRectToSnappedRect(rect, appUnitsPerDevPixel, *drawTarget);
ColorPattern black(ToDeviceColor(Color(0.f, 0.f, 0.f, 1.f)));
drawTarget->FillRect(devPxRect, black);
aRenderingContext->ThebesContext()->SetColor(color2);
fm->DrawString(buf, len, x+15, y+15, aRenderingContext);
aRenderingContext->ThebesContext()->SetColor(color);
fm->DrawString(buf, len, x, y, aRenderingContext);
aRenderingContext->ThebesContext()->Restore();
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::RemoveItems(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
delete counter;
free(str);
return HT_ENUMERATE_REMOVE;
}
//------------------------------------------------------------------
int ReflowCountMgr::RemoveIndiItems(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
delete counter;
free(str);
return HT_ENUMERATE_REMOVE;
}
//------------------------------------------------------------------
void ReflowCountMgr::CleanUp()
{
if (nullptr != mCounts) {
PL_HashTableEnumerateEntries(mCounts, RemoveItems, nullptr);
PL_HashTableDestroy(mCounts);
mCounts = nullptr;
}
if (nullptr != mIndiFrameCounts) {
PL_HashTableEnumerateEntries(mIndiFrameCounts, RemoveIndiItems, nullptr);
PL_HashTableDestroy(mIndiFrameCounts);
mIndiFrameCounts = nullptr;
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleTotal(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->DisplayTotals(str);
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
}
printf("\t\t\t\tTotal\n");
for (uint32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
PL_HashTableEnumerateEntries(mCounts, DoSingleTotal, this);
}
}
static void RecurseIndiTotals(nsPresContext* aPresContext,
PLHashTable * aHT,
nsIFrame * aParentFrame,
int32_t aLevel)
{
if (aParentFrame == nullptr) {
return;
}
char key[KEY_BUF_SIZE_FOR_PTR];
snprintf_literal(key, "%p", (void*)aParentFrame);
IndiReflowCounter * counter = (IndiReflowCounter *)PL_HashTableLookup(aHT, key);
if (counter) {
counter->mHasBeenOutput = true;
char * name = ToNewCString(counter->mName);
for (int32_t i=0;i<aLevel;i++) printf(" ");
printf("%s - %p [%d][", name, (void*)aParentFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
for (nsIFrame* child : aParentFrame->PrincipalChildList()) {
RecurseIndiTotals(aPresContext, aHT, child, aLevel+1);
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleIndi(PLHashEntry *he, int i, void *arg)
{
IndiReflowCounter * counter = (IndiReflowCounter *)he->value;
if (counter && !counter->mHasBeenOutput) {
char * name = ToNewCString(counter->mName);
printf("%s - %p [%d][", name, (void*)counter->mFrame, counter->mCount);
printf("%d", counter->mCounter.GetTotal());
printf("]\n");
free(name);
}
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoIndiTotalsTree()
{
if (nullptr != mCounts) {
printf("\n------------------------------------------------\n");
printf("-- Individual Frame Counts\n");
printf("------------------------------------------------\n");
if (mPresShell) {
nsIFrame * rootFrame = mPresShell->FrameManager()->GetRootFrame();
RecurseIndiTotals(mPresContext, mIndiFrameCounts, rootFrame, 0);
printf("------------------------------------------------\n");
printf("-- Individual Counts of Frames not in Root Tree\n");
printf("------------------------------------------------\n");
PL_HashTableEnumerateEntries(mIndiFrameCounts, DoSingleIndi, this);
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoSingleHTMLTotal(PLHashEntry *he, int i, void *arg)
{
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->DisplayHTMLTotals(str);
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DoGrandHTMLTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
}
static const char * title[] = {"Class", "Reflows"};
fprintf(mFD, "<tr>");
for (uint32_t i=0; i < ArrayLength(title); i++) {
fprintf(mFD, "<td><center><b>%s<b></center></td>", title[i]);
}
fprintf(mFD, "</tr>\n");
PL_HashTableEnumerateEntries(mCounts, DoSingleHTMLTotal, this);
}
}
//------------------------------------
void ReflowCountMgr::DisplayTotals(const char * aStr)
{
#ifdef DEBUG_rods
printf("%s\n", aStr?aStr:"No name");
#endif
if (mDumpFrameCounts) {
DoGrandTotals();
}
if (mDumpFrameByFrameCounts) {
DoIndiTotalsTree();
}
}
//------------------------------------
void ReflowCountMgr::DisplayHTMLTotals(const char * aStr)
{
#ifdef WIN32x // XXX NOT XP!
char name[1024];
char * sptr = strrchr(aStr, '/');
if (sptr) {
sptr++;
strcpy(name, sptr);
char * eptr = strrchr(name, '.');
if (eptr) {
*eptr = 0;
}
strcat(name, "_stats.html");
}
mFD = fopen(name, "w");
if (mFD) {
fprintf(mFD, "<html><head><title>Reflow Stats</title></head><body>\n");
const char * title = aStr?aStr:"No name";
fprintf(mFD, "<center><b>%s</b><br><table border=1 style=\"background-color:#e0e0e0\">", title);
DoGrandHTMLTotals();
fprintf(mFD, "</center></table>\n");
fprintf(mFD, "</body></html>\n");
fclose(mFD);
mFD = nullptr;
}
#endif // not XP!
}
//------------------------------------------------------------------
int ReflowCountMgr::DoClearTotals(PLHashEntry *he, int i, void *arg)
{
ReflowCounter * counter = (ReflowCounter *)he->value;
counter->ClearTotals();
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearTotals()
{
PL_HashTableEnumerateEntries(mCounts, DoClearTotals, this);
}
//------------------------------------------------------------------
void ReflowCountMgr::ClearGrandTotals()
{
if (nullptr != mCounts) {
ReflowCounter * gTots = (ReflowCounter *)PL_HashTableLookup(mCounts, kGrandTotalsStr);
if (gTots == nullptr) {
gTots = new ReflowCounter(this);
PL_HashTableAdd(mCounts, NS_strdup(kGrandTotalsStr), gTots);
} else {
gTots->ClearTotals();
gTots->SetTotalsCache();
}
}
}
//------------------------------------------------------------------
int ReflowCountMgr::DoDisplayDiffTotals(PLHashEntry *he, int i, void *arg)
{
bool cycledOnce = (arg != 0);
char *str = (char *)he->key;
ReflowCounter * counter = (ReflowCounter *)he->value;
if (cycledOnce) {
counter->CalcDiffInTotals();
counter->DisplayDiffTotals(str);
}
counter->SetTotalsCache();
return HT_ENUMERATE_NEXT;
}
//------------------------------------------------------------------
void ReflowCountMgr::DisplayDiffsInTotals()
{
if (mCycledOnce) {
printf("Differences\n");
for (int32_t i=0;i<78;i++) {
printf("-");
}
printf("\n");
ClearGrandTotals();
}
PL_HashTableEnumerateEntries(mCounts, DoDisplayDiffTotals, (void *)mCycledOnce);
mCycledOnce = true;
}
#endif // MOZ_REFLOW_PERF
nsIFrame* nsIPresShell::GetAbsoluteContainingBlock(nsIFrame *aFrame)
{
return FrameConstructor()->GetAbsoluteContainingBlock(aFrame,
nsCSSFrameConstructor::ABS_POS);
}
#ifdef ACCESSIBILITY
bool
nsIPresShell::IsAccessibilityActive()
{
return GetAccService() != nullptr;
}
nsAccessibilityService*
nsIPresShell::AccService()
{
return GetAccService();
}
#endif
void nsIPresShell::InitializeStatics()
{
NS_ASSERTION(!gPointerCaptureList, "InitializeStatics called multiple times!");
gPointerCaptureList = new nsClassHashtable<nsUint32HashKey, PointerCaptureInfo>;
gActivePointersIds = new nsClassHashtable<nsUint32HashKey, PointerInfo>;
}
void nsIPresShell::ReleaseStatics()
{
NS_ASSERTION(gPointerCaptureList, "ReleaseStatics called without Initialize!");
delete gPointerCaptureList;
gPointerCaptureList = nullptr;
delete gActivePointersIds;
gActivePointersIds = nullptr;
}
// Asks our docshell whether we're active.
void PresShell::QueryIsActive()
{
nsCOMPtr<nsISupports> container = mPresContext->GetContainerWeak();
if (mDocument) {
nsIDocument* displayDoc = mDocument->GetDisplayDocument();
if (displayDoc) {
// Ok, we're an external resource document -- we need to use our display
// document's docshell to determine "IsActive" status, since we lack
// a container.
MOZ_ASSERT(!container,
"external resource doc shouldn't have its own container");
nsIPresShell* displayPresShell = displayDoc->GetShell();
if (displayPresShell) {
container = displayPresShell->GetPresContext()->GetContainerWeak();
}
}
}
nsCOMPtr<nsIDocShell> docshell(do_QueryInterface(container));
if (docshell) {
bool isActive;
nsresult rv = docshell->GetIsActive(&isActive);
// Even though in theory the docshell here could be "Inactive and
// Foreground", thus implying aIsHidden=false for SetIsActive(),
// this is a newly created PresShell so we'd like to invalidate anyway
// upon being made active to ensure that the contents get painted.
if (NS_SUCCEEDED(rv))
SetIsActive(isActive);
}
}
// Helper for propagating mIsActive changes to external resources
static bool
SetExternalResourceIsActive(nsIDocument* aDocument, void* aClosure)
{
nsIPresShell* shell = aDocument->GetShell();
if (shell) {
shell->SetIsActive(*static_cast<bool*>(aClosure));
}
return true;
}
static void
SetPluginIsActive(nsISupports* aSupports, void* aClosure)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aSupports));
if (!content) {
return;
}
nsIFrame *frame = content->GetPrimaryFrame();
nsIObjectFrame *objectFrame = do_QueryFrame(frame);
if (objectFrame) {
objectFrame->SetIsDocumentActive(*static_cast<bool*>(aClosure));
}
}
nsresult
PresShell::SetIsActive(bool aIsActive, bool aIsHidden)
{
NS_PRECONDITION(mDocument, "should only be called with a document");
mIsActive = aIsActive;
// Keep track of whether we've called TabChild::MakeHidden() or not.
// This can still be true even if aIsHidden is false.
mIsHidden |= aIsHidden;
nsPresContext* presContext = GetPresContext();
if (presContext &&
presContext->RefreshDriver()->PresContext() == presContext) {
presContext->RefreshDriver()->SetThrottled(!mIsActive);
}
// Propagate state-change to my resource documents' PresShells
mDocument->EnumerateExternalResources(SetExternalResourceIsActive,
&aIsActive);
mDocument->EnumerateActivityObservers(SetPluginIsActive,
&aIsActive);
nsresult rv = UpdateImageLockingState();
#ifdef ACCESSIBILITY
if (aIsActive) {
nsAccessibilityService* accService = AccService();
if (accService) {
accService->PresShellActivated(this);
}
}
#endif
// We have this odd special case here because remote content behaves
// differently from same-process content when "hidden". In
// desktop-type "browser UIs", hidden "tabs" have documents that are
// part of the chrome tree. When the tabs are hidden, their content
// is no longer part of the visible document tree, and the layers
// for the content are naturally released.
//
// Remote content is its own top-level tree in its subprocess. When
// it's "hidden", there's no transaction in which the document
// thinks it's not visible, so layers can be retained forever. This
// is problematic when those layers uselessly hold on to precious
// resources like directly texturable memory.
//
// PresShell::SetIsActive() is the first C++ entry point at which we
// (i) know that our parent process wants our content to be hidden;
// and (ii) has easy access to the TabChild. So we use this
// notification to signal the TabChild to drop its layer tree and
// stop trying to repaint.
if (mIsHidden) {
if (TabChild* tab = TabChild::GetFrom(this)) {
if (aIsActive) {
tab->MakeVisible();
// The only time we should set this to false is when
// TabChild::MakeVisible() is called.
mIsHidden = false;
if (!mIsZombie) {
if (nsIFrame* root = mFrameConstructor->GetRootFrame()) {
FrameLayerBuilder::InvalidateAllLayersForFrame(
nsLayoutUtils::GetDisplayRootFrame(root));
root->SchedulePaint();
}
}
} else {
tab->MakeHidden();
}
}
}
return rv;
}
/*
* Determines the current image locking state. Called when one of the
* dependent factors changes.
*/
nsresult
PresShell::UpdateImageLockingState()
{
// We're locked if we're both thawed and active.
bool locked = !mFrozen && mIsActive;
nsresult rv = mDocument->SetImageLockingState(locked);
if (locked) {
if (mInImageVisibility) {
gfxCriticalNoteOnce << "UpdateImageLockingState is re-entering on "
<< (NS_IsMainThread() ? "" : "non-") << "main thread";
}
// Request decodes for visible images; we want to start decoding as
// quickly as possible when we get foregrounded to minimize flashing.
for (auto iter = mVisibleImages.Iter(); !iter.Done(); iter.Next()) {
nsCOMPtr<nsIContent> content = do_QueryInterface(iter.Get()->GetKey());
nsImageFrame* imageFrame = do_QueryFrame(content->GetPrimaryFrame());
if (imageFrame) {
imageFrame->MaybeDecodeForPredictedSize();
}
}
}
return rv;
}
PresShell*
PresShell::GetRootPresShell()
{
if (mPresContext) {
nsPresContext* rootPresContext = mPresContext->GetRootPresContext();
if (rootPresContext) {
return static_cast<PresShell*>(rootPresContext->PresShell());
}
}
return nullptr;
}
void
PresShell::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
nsArenaMemoryStats *aArenaObjectsSize,
size_t *aPresShellSize,
size_t *aStyleSetsSize,
size_t *aTextRunsSize,
size_t *aPresContextSize)
{
mFrameArena.AddSizeOfExcludingThis(aMallocSizeOf, aArenaObjectsSize);
*aPresShellSize += aMallocSizeOf(this);
if (mCaret) {
*aPresShellSize += mCaret->SizeOfIncludingThis(aMallocSizeOf);
}
*aPresShellSize += mVisibleImages.ShallowSizeOfExcludingThis(aMallocSizeOf);
*aPresShellSize += mFramesToDirty.ShallowSizeOfExcludingThis(aMallocSizeOf);
*aPresShellSize += aArenaObjectsSize->mOther;
if (nsStyleSet* styleSet = StyleSet()->GetAsGecko()) {
*aStyleSetsSize += styleSet->SizeOfIncludingThis(aMallocSizeOf);
} else {
NS_WARNING("ServoStyleSets do not support memory measurements yet");
}
*aTextRunsSize += SizeOfTextRuns(aMallocSizeOf);
*aPresContextSize += mPresContext->SizeOfIncludingThis(aMallocSizeOf);
}
size_t
PresShell::SizeOfTextRuns(MallocSizeOf aMallocSizeOf) const
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (!rootFrame) {
return 0;
}
// clear the TEXT_RUN_MEMORY_ACCOUNTED flags
nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, nullptr,
/* clear = */true);
// collect the total memory in use for textruns
return nsLayoutUtils::SizeOfTextRunsForFrames(rootFrame, aMallocSizeOf,
/* clear = */false);
}
void
nsIPresShell::MarkFixedFramesForReflow(IntrinsicDirty aIntrinsicDirty)
{
nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
if (rootFrame) {
const nsFrameList& childList = rootFrame->GetChildList(nsIFrame::kFixedList);
for (nsIFrame* childFrame : childList) {
FrameNeedsReflow(childFrame, aIntrinsicDirty, NS_FRAME_IS_DIRTY);
}
}
}
void
nsIPresShell::SetScrollPositionClampingScrollPortSize(nscoord aWidth, nscoord aHeight)
{
if (!mScrollPositionClampingScrollPortSizeSet ||
mScrollPositionClampingScrollPortSize.width != aWidth ||
mScrollPositionClampingScrollPortSize.height != aHeight) {
mScrollPositionClampingScrollPortSizeSet = true;
mScrollPositionClampingScrollPortSize.width = aWidth;
mScrollPositionClampingScrollPortSize.height = aHeight;
if (nsIScrollableFrame* rootScrollFrame = GetRootScrollFrameAsScrollable()) {
rootScrollFrame->MarkScrollbarsDirtyForReflow();
}
MarkFixedFramesForReflow(nsIPresShell::eResize);
}
}
void
PresShell::SetupFontInflation()
{
mFontSizeInflationEmPerLine = nsLayoutUtils::FontSizeInflationEmPerLine();
mFontSizeInflationMinTwips = nsLayoutUtils::FontSizeInflationMinTwips();
mFontSizeInflationLineThreshold = nsLayoutUtils::FontSizeInflationLineThreshold();
mFontSizeInflationForceEnabled = nsLayoutUtils::FontSizeInflationForceEnabled();
mFontSizeInflationDisabledInMasterProcess = nsLayoutUtils::FontSizeInflationDisabledInMasterProcess();
NotifyFontSizeInflationEnabledIsDirty();
}
void
nsIPresShell::RecomputeFontSizeInflationEnabled()
{
mFontSizeInflationEnabledIsDirty = false;
MOZ_ASSERT(mPresContext, "our pres context should not be null");
if ((FontSizeInflationEmPerLine() == 0 &&
FontSizeInflationMinTwips() == 0) || mPresContext->IsChrome()) {
mFontSizeInflationEnabled = false;
return;
}
// Force-enabling font inflation always trumps the heuristics here.
if (!FontSizeInflationForceEnabled()) {
if (TabChild* tab = TabChild::GetFrom(this)) {
// We're in a child process. Cancel inflation if we're not
// async-pan zoomed.
if (!tab->AsyncPanZoomEnabled()) {
mFontSizeInflationEnabled = false;
return;
}
} else if (XRE_IsParentProcess()) {
// We're in the master process. Cancel inflation if it's been
// explicitly disabled.
if (FontSizeInflationDisabledInMasterProcess()) {
mFontSizeInflationEnabled = false;
return;
}
}
}
// XXXjwir3:
// See bug 706918, comment 23 for more information on this particular section
// of the code. We're using "screen size" in place of the size of the content
// area, because on mobile, these are close or equal. This will work for our
// purposes (bug 706198), but it will need to be changed in the future to be
// more correct when we bring the rest of the viewport code into platform.
// We actually want the size of the content area, in the event that we don't
// have any metadata about the width and/or height. On mobile, the screen size
// and the size of the content area are very close, or the same value.
// In XUL fennec, the content area is the size of the <browser> widget, but
// in native fennec, the content area is the size of the Gecko LayerView
// object.
// TODO:
// Once bug 716575 has been resolved, this code should be changed so that it
// does the right thing on all platforms.
nsresult rv;
nsCOMPtr<nsIScreenManager> screenMgr =
do_GetService("@mozilla.org/gfx/screenmanager;1", &rv);
if (!NS_SUCCEEDED(rv)) {
mFontSizeInflationEnabled = false;
return;
}
nsCOMPtr<nsIScreen> screen;
screenMgr->GetPrimaryScreen(getter_AddRefs(screen));
if (screen) {
int32_t screenLeft, screenTop, screenWidth, screenHeight;
screen->GetRect(&screenLeft, &screenTop, &screenWidth, &screenHeight);
nsViewportInfo vInf =
GetDocument()->GetViewportInfo(ScreenIntSize(screenWidth, screenHeight));
if (vInf.GetDefaultZoom() >= CSSToScreenScale(1.0f) || vInf.IsAutoSizeEnabled()) {
mFontSizeInflationEnabled = false;
return;
}
}
mFontSizeInflationEnabled = true;
}
bool
nsIPresShell::FontSizeInflationEnabled()
{
if (mFontSizeInflationEnabledIsDirty) {
RecomputeFontSizeInflationEnabled();
}
return mFontSizeInflationEnabled;
}
void
PresShell::PausePainting()
{
if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
return;
mPaintingIsFrozen = true;
GetPresContext()->RefreshDriver()->Freeze();
}
void
PresShell::ResumePainting()
{
if (GetPresContext()->RefreshDriver()->PresContext() != GetPresContext())
return;
mPaintingIsFrozen = false;
GetPresContext()->RefreshDriver()->Thaw();
}
void
nsIPresShell::SyncWindowProperties(nsView* aView)
{
nsIFrame* frame = aView->GetFrame();
if (frame && mPresContext) {
// CreateReferenceRenderingContext can return nullptr
nsRenderingContext rcx(CreateReferenceRenderingContext());
nsContainerFrame::SyncWindowProperties(mPresContext, frame, aView, &rcx, 0);
}
}
nsresult
nsIPresShell::HasRuleProcessorUsedByMultipleStyleSets(uint32_t aSheetType,
bool* aRetVal)
{
SheetType type;
switch (aSheetType) {
case nsIStyleSheetService::AGENT_SHEET:
type = SheetType::Agent;
break;
case nsIStyleSheetService::USER_SHEET:
type = SheetType::User;
break;
case nsIStyleSheetService::AUTHOR_SHEET:
type = SheetType::Doc;
break;
default:
MOZ_ASSERT(false, "unexpected aSheetType value");
return NS_ERROR_ILLEGAL_VALUE;
}
*aRetVal = false;
if (nsStyleSet* styleSet = mStyleSet->GetAsGecko()) {
// ServoStyleSets do not have rule processors.
*aRetVal = styleSet->HasRuleProcessorUsedByMultipleStyleSets(type);
}
return NS_OK;
}
void
nsIPresShell::SetIsInFullscreenChange(bool aValue)
{
if (mIsInFullscreenChange == aValue) {
NS_WARNING(aValue ? "Pres shell has been in fullscreen change?" :
"Pres shell is not in fullscreen change?");
return;
}
mIsInFullscreenChange = aValue;
if (nsRefreshDriver* rd = mPresContext->RefreshDriver()) {
if (aValue) {
rd->Freeze();
} else {
rd->Thaw();
}
}
}
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