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gecko-dev/layout/forms/nsComboboxControlFrame.cpp
Ting-Yu Lin 8b74ff00e0 Bug 1716212 Part 2 - Carry nsComboboxControlFrame's line-height to nsComboboxDisplayFrame when it has auto block-size. r=emilio 
The issue is that combobox display may contain some non-Latin characters
that need extra block-size to display than the one line-height
calculate by using a Latin font spec in combobox control's style.

Before this patch, when a combobox control has unconstrained block-size,
we set combobox display's block-size to combobox control's one
line-height in Reflow(), which is intended to properly initialize
`BlockReflowInput::mMinLineHeight` since combobox display has
`line-height:-moz-block-height`. However, this simply prevents the
combobox display from choosing a larger block-size after the reflow. See
bug 1716212 comment 11 for an analysis.

This patch fixes the issue by carrying combox control's computed line
height to combobox display so that its computed block-size is still
unconstrained so that it can accommodate taller characters in the
display text.

After this patch, <select><option> containing non-Latin characters
should have the same block-size as <button>, and no characters should be
clipped. Modified test_unstyled_control_height.html to test this.

Differential Revision: https://phabricator.services.mozilla.com/D120877
2021-07-28 18:41:19 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "nsComboboxControlFrame.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PathHelpers.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsFocusManager.h"
#include "nsCheckboxRadioFrame.h"
#include "nsGkAtoms.h"
#include "nsCSSAnonBoxes.h"
#include "nsHTMLParts.h"
#include "nsIFormControl.h"
#include "nsILayoutHistoryState.h"
#include "nsNameSpaceManager.h"
#include "nsListControlFrame.h"
#include "nsPIDOMWindow.h"
#include "mozilla/PresState.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsIContentInlines.h"
#include "nsIDOMEventListener.h"
#include "nsISelectControlFrame.h"
#include "nsContentUtils.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/HTMLSelectElement.h"
#include "mozilla/dom/Document.h"
#include "nsIScrollableFrame.h"
#include "mozilla/ServoStyleSet.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsITheme.h"
#include "nsStyleConsts.h"
#include "mozilla/Likely.h"
#include <algorithm>
#include "nsTextNode.h"
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/EventStates.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/Unused.h"
#include "gfx2DGlue.h"
#include "mozilla/widget/nsAutoRollup.h"
#ifdef XP_WIN
# define COMBOBOX_ROLLUP_CONSUME_EVENT 0
#else
# define COMBOBOX_ROLLUP_CONSUME_EVENT 1
#endif
using namespace mozilla;
using namespace mozilla::gfx;
using mozilla::dom::Document;
NS_IMETHODIMP
nsComboboxControlFrame::RedisplayTextEvent::Run() {
if (mControlFrame) mControlFrame->HandleRedisplayTextEvent();
return NS_OK;
}
// Drop down list event management.
// The combo box uses the following strategy for managing the drop-down list.
// If the combo box or its arrow button is clicked on the drop-down list is
// displayed If mouse exits the combo box with the drop-down list displayed the
// drop-down list is asked to capture events The drop-down list will capture all
// events including mouse down and up and will always return with
// ListWasSelected method call regardless of whether an item in the list was
// actually selected.
// The ListWasSelected code will turn off mouse-capture for the drop-down list.
// The drop-down list does not explicitly set capture when it is in the
// drop-down mode.
/**
* Helper class that listens to the combo boxes button. If the button is pressed
* the combo box is toggled to open or close. this is used by Accessibility
* which presses that button Programmatically.
*/
class nsComboButtonListener final : public nsIDOMEventListener {
private:
virtual ~nsComboButtonListener() = default;
public:
NS_DECL_ISUPPORTS
MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD HandleEvent(dom::Event*) override {
mComboBox->ShowDropDown(!mComboBox->IsDroppedDown());
return NS_OK;
}
explicit nsComboButtonListener(nsComboboxControlFrame* aCombobox) {
mComboBox = aCombobox;
}
nsComboboxControlFrame* mComboBox;
};
NS_IMPL_ISUPPORTS(nsComboButtonListener, nsIDOMEventListener)
// static class data member for Bug 32920
nsComboboxControlFrame* nsComboboxControlFrame::sFocused = nullptr;
nsComboboxControlFrame* NS_NewComboboxControlFrame(PresShell* aPresShell,
ComputedStyle* aStyle,
nsFrameState aStateFlags) {
nsComboboxControlFrame* it = new (aPresShell)
nsComboboxControlFrame(aStyle, aPresShell->GetPresContext());
if (it) {
// set the state flags (if any are provided)
it->AddStateBits(aStateFlags);
}
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsComboboxControlFrame)
//-----------------------------------------------------------
// Reflow Debugging Macros
// These let us "see" how many reflow counts are happening
//-----------------------------------------------------------
#ifdef DO_REFLOW_COUNTER
# define MAX_REFLOW_CNT 1024
static int32_t gTotalReqs = 0;
;
static int32_t gTotalReflows = 0;
;
static int32_t gReflowControlCntRQ[MAX_REFLOW_CNT];
static int32_t gReflowControlCnt[MAX_REFLOW_CNT];
static int32_t gReflowInx = -1;
# define REFLOW_COUNTER() \
if (mReflowId > -1) gReflowControlCnt[mReflowId]++;
# define REFLOW_COUNTER_REQUEST() \
if (mReflowId > -1) gReflowControlCntRQ[mReflowId]++;
# define REFLOW_COUNTER_DUMP(__desc) \
if (mReflowId > -1) { \
gTotalReqs += gReflowControlCntRQ[mReflowId]; \
gTotalReflows += gReflowControlCnt[mReflowId]; \
printf("** Id:%5d %s RF: %d RQ: %d %d/%d %5.2f\n", mReflowId, \
(__desc), gReflowControlCnt[mReflowId], \
gReflowControlCntRQ[mReflowId], gTotalReflows, gTotalReqs, \
float(gTotalReflows) / float(gTotalReqs) * 100.0f); \
}
# define REFLOW_COUNTER_INIT() \
if (gReflowInx < MAX_REFLOW_CNT) { \
gReflowInx++; \
mReflowId = gReflowInx; \
gReflowControlCnt[mReflowId] = 0; \
gReflowControlCntRQ[mReflowId] = 0; \
} else { \
mReflowId = -1; \
}
// reflow messages
# define REFLOW_DEBUG_MSG(_msg1) printf((_msg1))
# define REFLOW_DEBUG_MSG2(_msg1, _msg2) printf((_msg1), (_msg2))
# define REFLOW_DEBUG_MSG3(_msg1, _msg2, _msg3) \
printf((_msg1), (_msg2), (_msg3))
# define REFLOW_DEBUG_MSG4(_msg1, _msg2, _msg3, _msg4) \
printf((_msg1), (_msg2), (_msg3), (_msg4))
#else //-------------
# define REFLOW_COUNTER_REQUEST()
# define REFLOW_COUNTER()
# define REFLOW_COUNTER_DUMP(__desc)
# define REFLOW_COUNTER_INIT()
# define REFLOW_DEBUG_MSG(_msg)
# define REFLOW_DEBUG_MSG2(_msg1, _msg2)
# define REFLOW_DEBUG_MSG3(_msg1, _msg2, _msg3)
# define REFLOW_DEBUG_MSG4(_msg1, _msg2, _msg3, _msg4)
#endif
//------------------------------------------
// This is for being VERY noisy
//------------------------------------------
#ifdef DO_VERY_NOISY
# define REFLOW_NOISY_MSG(_msg1) printf((_msg1))
# define REFLOW_NOISY_MSG2(_msg1, _msg2) printf((_msg1), (_msg2))
# define REFLOW_NOISY_MSG3(_msg1, _msg2, _msg3) \
printf((_msg1), (_msg2), (_msg3))
# define REFLOW_NOISY_MSG4(_msg1, _msg2, _msg3, _msg4) \
printf((_msg1), (_msg2), (_msg3), (_msg4))
#else
# define REFLOW_NOISY_MSG(_msg)
# define REFLOW_NOISY_MSG2(_msg1, _msg2)
# define REFLOW_NOISY_MSG3(_msg1, _msg2, _msg3)
# define REFLOW_NOISY_MSG4(_msg1, _msg2, _msg3, _msg4)
#endif
//------------------------------------------
// Displays value in pixels or twips
//------------------------------------------
#ifdef DO_PIXELS
# define PX(__v) __v / 15
#else
# define PX(__v) __v
#endif
//------------------------------------------------------
//-- Done with macros
//------------------------------------------------------
nsComboboxControlFrame::nsComboboxControlFrame(ComputedStyle* aStyle,
nsPresContext* aPresContext)
: nsBlockFrame(aStyle, aPresContext, kClassID),
mDisplayFrame(nullptr),
mButtonFrame(nullptr),
mDropdownFrame(nullptr),
mDisplayISize(0),
mMaxDisplayISize(0),
mRecentSelectedIndex(NS_SKIP_NOTIFY_INDEX),
mDisplayedIndex(-1),
mLastDropDownBeforeScreenBCoord(nscoord_MIN),
mLastDropDownAfterScreenBCoord(nscoord_MIN),
mDroppedDown(false),
mInRedisplayText(false),
mDelayedShowDropDown(false),
mIsOpenInParentProcess(false){REFLOW_COUNTER_INIT()}
//--------------------------------------------------------------
nsComboboxControlFrame::~nsComboboxControlFrame() {
REFLOW_COUNTER_DUMP("nsCCF");
}
//--------------------------------------------------------------
NS_QUERYFRAME_HEAD(nsComboboxControlFrame)
NS_QUERYFRAME_ENTRY(nsComboboxControlFrame)
NS_QUERYFRAME_ENTRY(nsIFormControlFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_ENTRY(nsISelectControlFrame)
NS_QUERYFRAME_ENTRY(nsIStatefulFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrame)
#ifdef ACCESSIBILITY
a11y::AccType nsComboboxControlFrame::AccessibleType() {
return a11y::eHTMLComboboxType;
}
#endif
void nsComboboxControlFrame::SetFocus(bool aOn, bool aRepaint) {
AutoWeakFrame weakFrame(this);
if (aOn) {
nsListControlFrame::ComboboxFocusSet();
sFocused = this;
if (mDelayedShowDropDown) {
ShowDropDown(true); // might destroy us
if (!weakFrame.IsAlive()) {
return;
}
}
} else {
sFocused = nullptr;
mDelayedShowDropDown = false;
if (mDroppedDown) {
mDropdownFrame->ComboboxFinish(mDisplayedIndex); // might destroy us
if (!weakFrame.IsAlive()) {
return;
}
}
// May delete |this|.
mDropdownFrame->FireOnInputAndOnChange();
}
if (!weakFrame.IsAlive()) {
return;
}
// This is needed on a temporary basis. It causes the focus
// rect to be drawn. This is much faster than ReResolvingStyle
// Bug 32920
InvalidateFrame();
}
void nsComboboxControlFrame::ShowPopup(bool aShowPopup) {
nsView* view = mDropdownFrame->GetView();
nsViewManager* viewManager = view->GetViewManager();
if (aShowPopup) {
nsRect rect = mDropdownFrame->GetRect();
rect.x = rect.y = 0;
viewManager->ResizeView(view, rect);
viewManager->SetViewVisibility(view, nsViewVisibility_kShow);
} else {
viewManager->SetViewVisibility(view, nsViewVisibility_kHide);
nsRect emptyRect(0, 0, 0, 0);
viewManager->ResizeView(view, emptyRect);
}
// fire a popup dom event if it is safe to do so
RefPtr<mozilla::PresShell> presShell = PresContext()->GetPresShell();
if (presShell && nsContentUtils::IsSafeToRunScript()) {
nsEventStatus status = nsEventStatus_eIgnore;
WidgetMouseEvent event(true,
aShowPopup ? eXULPopupShowing : eXULPopupHiding,
nullptr, WidgetMouseEvent::eReal);
nsCOMPtr<nsIContent> content = mContent;
presShell->HandleDOMEventWithTarget(content, &event, &status);
}
}
bool nsComboboxControlFrame::ShowList(bool aShowList) {
nsView* view = mDropdownFrame->GetView();
if (aShowList) {
NS_ASSERTION(
!view->HasWidget(),
"We shouldn't have a widget before we need to display the popup");
// Create the widget for the drop-down list
view->GetViewManager()->SetViewFloating(view, true);
nsWidgetInitData widgetData;
widgetData.mWindowType = eWindowType_popup;
widgetData.mBorderStyle = eBorderStyle_default;
view->CreateWidgetForPopup(&widgetData);
} else {
nsIWidget* widget = view->GetWidget();
if (widget) {
// We must do this before ShowPopup in case it destroys us (bug 813442).
widget->CaptureRollupEvents(this, false);
}
}
AutoWeakFrame weakFrame(this);
ShowPopup(aShowList); // might destroy us
if (!weakFrame.IsAlive()) {
return false;
}
mDroppedDown = aShowList;
nsIWidget* widget = view->GetWidget();
if (mDroppedDown) {
// The listcontrol frame will call back to the nsComboboxControlFrame's
// ListWasSelected which will stop the capture.
mDropdownFrame->AboutToDropDown();
mDropdownFrame->CaptureMouseEvents(true);
if (widget) {
widget->CaptureRollupEvents(this, true);
}
} else {
if (widget) {
view->DestroyWidget();
}
}
return weakFrame.IsAlive();
}
class nsResizeDropdownAtFinalPosition final : public nsIReflowCallback,
public Runnable {
public:
explicit nsResizeDropdownAtFinalPosition(nsComboboxControlFrame* aFrame)
: mozilla::Runnable("nsResizeDropdownAtFinalPosition"), mFrame(aFrame) {}
protected:
~nsResizeDropdownAtFinalPosition() = default;
public:
bool ReflowFinished() final {
Run();
NS_RELEASE_THIS();
return false;
}
void ReflowCallbackCanceled() final { NS_RELEASE_THIS(); }
NS_IMETHOD Run() final {
if (mFrame.IsAlive()) {
static_cast<nsComboboxControlFrame*>(mFrame.GetFrame())
->AbsolutelyPositionDropDown();
}
return NS_OK;
}
WeakFrame mFrame;
};
void nsComboboxControlFrame::ReflowDropdown(nsPresContext* aPresContext,
const ReflowInput& aReflowInput) {
// All we want out of it later on, really, is the block size of a row, so we
// don't even need to cache mDropdownFrame's ascent or anything. If we don't
// need to reflow it, just bail out here.
if (!aReflowInput.ShouldReflowAllKids() &&
!mDropdownFrame->IsSubtreeDirty()) {
return;
}
// XXXbz this will, for small-block-size dropdowns, have extra space
// on the appropriate edge for the scrollbar we don't show... but
// that's the best we can do here for now.
WritingMode wm = mDropdownFrame->GetWritingMode();
LogicalSize availSize = aReflowInput.AvailableSize(wm);
availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
ReflowInput kidReflowInput(aPresContext, aReflowInput, mDropdownFrame,
availSize);
// If the dropdown's intrinsic inline size is narrower than our
// specified inline size, then expand it out. We want our border-box
// inline size to end up the same as the dropdown's so account for
// both sets of mComputedBorderPadding.
nscoord forcedISize =
aReflowInput.ComputedISize() +
aReflowInput.ComputedLogicalBorderPadding(wm).IStartEnd(wm) -
kidReflowInput.ComputedLogicalBorderPadding(wm).IStartEnd(wm);
kidReflowInput.SetComputedISize(
std::max(kidReflowInput.ComputedISize(), forcedISize));
// ensure we start off hidden
if (!mDroppedDown && HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
nsView* view = mDropdownFrame->GetView();
nsViewManager* viewManager = view->GetViewManager();
viewManager->SetViewVisibility(view, nsViewVisibility_kHide);
nsRect emptyRect(0, 0, 0, 0);
viewManager->ResizeView(view, emptyRect);
}
// Allow the child to move/size/change-visibility its view if it's currently
// dropped down
ReflowChildFlags flags = mDroppedDown ? ReflowChildFlags::Default
: ReflowChildFlags::NoMoveFrame |
ReflowChildFlags::NoSizeView;
// XXX Can this be different from the dropdown's writing mode?
// That would be odd!
// Note that we don't need to pass the true frame position or container size
// to ReflowChild or FinishReflowChild here; it will be positioned as needed
// by AbsolutelyPositionDropDown().
WritingMode outerWM = GetWritingMode();
const nsSize dummyContainerSize;
ReflowOutput desiredSize(aReflowInput);
nsReflowStatus ignoredStatus;
ReflowChild(mDropdownFrame, aPresContext, desiredSize, kidReflowInput,
outerWM, LogicalPoint(outerWM), dummyContainerSize, flags,
ignoredStatus);
// Set the child's width and height to its desired size
FinishReflowChild(mDropdownFrame, aPresContext, desiredSize, &kidReflowInput,
outerWM, LogicalPoint(outerWM), dummyContainerSize, flags);
}
nsPoint nsComboboxControlFrame::GetCSSTransformTranslation() {
nsIFrame* frame = this;
bool is3DTransform = false;
Matrix transform;
while (frame) {
nsIFrame* parent;
Matrix4x4Flagged ctm = frame->GetTransformMatrix(
ViewportType::Layout, RelativeTo{nullptr}, &parent);
Matrix matrix;
if (ctm.Is2D(&matrix)) {
transform = transform * matrix;
} else {
is3DTransform = true;
break;
}
frame = parent;
}
nsPoint translation;
if (!is3DTransform && !transform.HasNonTranslation()) {
nsPresContext* pc = PresContext();
// To get the translation introduced only by transforms we subtract the
// regular non-transform translation.
nsRootPresContext* rootPC = pc->GetRootPresContext();
if (rootPC) {
int32_t apd = pc->AppUnitsPerDevPixel();
translation.x = NSFloatPixelsToAppUnits(transform._31, apd);
translation.y = NSFloatPixelsToAppUnits(transform._32, apd);
translation -= GetOffsetToCrossDoc(rootPC->PresShell()->GetRootFrame());
}
}
return translation;
}
class nsAsyncRollup : public Runnable {
public:
explicit nsAsyncRollup(nsComboboxControlFrame* aFrame)
: mozilla::Runnable("nsAsyncRollup"), mFrame(aFrame) {}
MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
if (mFrame.IsAlive()) {
static_cast<nsComboboxControlFrame*>(mFrame.GetFrame())->RollupFromList();
}
return NS_OK;
}
WeakFrame mFrame;
};
class nsAsyncResize : public Runnable {
public:
explicit nsAsyncResize(nsComboboxControlFrame* aFrame)
: mozilla::Runnable("nsAsyncResize"), mFrame(aFrame) {}
MOZ_CAN_RUN_SCRIPT_BOUNDARY NS_IMETHOD Run() override {
if (mFrame.IsAlive()) {
nsComboboxControlFrame* combo =
static_cast<nsComboboxControlFrame*>(mFrame.GetFrame());
combo->mDropdownFrame->SetSuppressScrollbarUpdate(true);
RefPtr<PresShell> presShell = mFrame->PresShell();
presShell->FrameNeedsReflow(combo->mDropdownFrame, IntrinsicDirty::Resize,
NS_FRAME_IS_DIRTY);
presShell->FlushPendingNotifications(FlushType::Layout);
if (mFrame.IsAlive()) {
combo = static_cast<nsComboboxControlFrame*>(mFrame.GetFrame());
combo->mDropdownFrame->SetSuppressScrollbarUpdate(false);
if (combo->mDelayedShowDropDown) {
combo->ShowDropDown(true);
}
}
}
return NS_OK;
}
WeakFrame mFrame;
};
// Returns the usable screen rect in app units, the rect where we can
// draw the dropdown.
static nsRect GetUsableScreenRect(nsPresContext* aPresContext) {
nsRect screen;
nsDeviceContext* context = aPresContext->DeviceContext();
int32_t dropdownCanOverlapOSBar =
LookAndFeel::GetInt(LookAndFeel::IntID::MenusCanOverlapOSBar, 0);
if (dropdownCanOverlapOSBar) {
context->GetRect(screen);
} else {
context->GetClientRect(screen);
}
return screen;
}
void nsComboboxControlFrame::GetAvailableDropdownSpace(
WritingMode aWM, nscoord* aBefore, nscoord* aAfter,
LogicalPoint* aTranslation) {
MOZ_ASSERT(!XRE_IsContentProcess());
// Note: At first glance, it appears that you could simply get the
// absolute bounding box for the dropdown list by first getting its
// view, then getting the view's nsIWidget, then asking the nsIWidget
// for its AbsoluteBounds.
// The problem with this approach, is that the dropdown list's bcoord
// location can change based on whether the dropdown is placed after
// or before the display frame. The approach taken here is to get the
// absolute position of the display frame and use its location to
// determine if the dropdown will go offscreen.
// Normal frame geometry (eg GetOffsetTo, mRect) doesn't include transforms.
// In the special case that our transform is only a 2D translation we
// introduce this hack so that the dropdown will show up in the right place.
// Use null container size when converting a vector from logical to physical.
const nsSize nullContainerSize;
*aTranslation =
LogicalPoint(aWM, GetCSSTransformTranslation(), nullContainerSize);
*aBefore = 0;
*aAfter = 0;
nsRect screen = ::GetUsableScreenRect(PresContext());
nsSize containerSize = screen.Size();
LogicalRect logicalScreen(aWM, screen, containerSize);
if (mLastDropDownAfterScreenBCoord == nscoord_MIN) {
LogicalRect thisScreenRect(aWM, GetScreenRectInAppUnits(), containerSize);
mLastDropDownAfterScreenBCoord =
thisScreenRect.BEnd(aWM) + aTranslation->B(aWM);
mLastDropDownBeforeScreenBCoord =
thisScreenRect.BStart(aWM) + aTranslation->B(aWM);
}
nscoord minBCoord;
nsPresContext* pc =
PresContext()->GetInProcessRootContentDocumentPresContext();
nsIFrame* root = pc ? pc->PresShell()->GetRootFrame() : nullptr;
if (root) {
minBCoord = LogicalRect(aWM, root->GetScreenRectInAppUnits(), containerSize)
.BStart(aWM);
if (mLastDropDownAfterScreenBCoord < minBCoord) {
// Don't allow the drop-down to be placed before the content area.
return;
}
} else {
minBCoord = logicalScreen.BStart(aWM);
}
nscoord after = logicalScreen.BEnd(aWM) - mLastDropDownAfterScreenBCoord;
nscoord before = mLastDropDownBeforeScreenBCoord - minBCoord;
// If the difference between the space before and after is less
// than a row-block-size, then we favor the space after.
if (before >= after) {
nscoord rowBSize = mDropdownFrame->GetBSizeOfARow();
if (before < after + rowBSize) {
before -= rowBSize;
}
}
*aAfter = after;
*aBefore = before;
}
nsComboboxControlFrame::DropDownPositionState
nsComboboxControlFrame::AbsolutelyPositionDropDown() {
if (XRE_IsContentProcess()) {
return eDropDownPositionSuppressed;
}
WritingMode wm = GetWritingMode();
LogicalPoint translation(wm);
nscoord before, after;
mLastDropDownAfterScreenBCoord = nscoord_MIN;
GetAvailableDropdownSpace(wm, &before, &after, &translation);
if (before <= 0 && after <= 0) {
if (IsDroppedDown()) {
// Hide the view immediately to minimize flicker.
nsView* view = mDropdownFrame->GetView();
view->GetViewManager()->SetViewVisibility(view, nsViewVisibility_kHide);
NS_DispatchToCurrentThread(new nsAsyncRollup(this));
}
return eDropDownPositionSuppressed;
}
LogicalSize dropdownSize = mDropdownFrame->GetLogicalSize(wm);
nscoord bSize = std::max(before, after);
if (bSize < dropdownSize.BSize(wm)) {
if (mDropdownFrame->GetNumDisplayRows() > 1) {
// The drop-down doesn't fit and currently shows more than 1 row -
// schedule a resize to show fewer rows.
NS_DispatchToCurrentThread(new nsAsyncResize(this));
return eDropDownPositionPendingResize;
}
} else if (bSize > (dropdownSize.BSize(wm) +
mDropdownFrame->GetBSizeOfARow() * 1.5) &&
mDropdownFrame->GetDropdownCanGrow()) {
// The drop-down fits but there is room for at least 1.5 more rows -
// schedule a resize to show more rows if it has more rows to show.
// (1.5 rows for good measure to avoid any rounding issues that would
// lead to a loop of reflow requests)
NS_DispatchToCurrentThread(new nsAsyncResize(this));
return eDropDownPositionPendingResize;
}
// Position the drop-down after if there is room, otherwise place it before
// if there is room. If there is no room for it on either side then place
// it after (to avoid overlapping UI like the URL bar).
bool b = dropdownSize.BSize(wm) <= after || dropdownSize.BSize(wm) > before;
LogicalPoint dropdownPosition(wm, 0, b ? BSize(wm) : -dropdownSize.BSize(wm));
// Don't position the view unless the position changed since it might cause
// a call to NotifyGeometryChange() and an infinite loop here.
nsSize containerSize = GetSize();
const LogicalPoint currentPos =
mDropdownFrame->GetLogicalPosition(containerSize);
const LogicalPoint newPos = dropdownPosition + translation;
if (currentPos != newPos) {
mDropdownFrame->SetPosition(wm, newPos, containerSize);
nsContainerFrame::PositionFrameView(mDropdownFrame);
}
return eDropDownPositionFinal;
}
void nsComboboxControlFrame::NotifyGeometryChange() {
if (XRE_IsContentProcess()) {
return;
}
// We don't need to resize if we're not dropped down since ShowDropDown
// does that, or if we're dirty then the reflow callback does it,
// or if we have a delayed ShowDropDown pending.
if (IsDroppedDown() && !HasAnyStateBits(NS_FRAME_IS_DIRTY) &&
!mDelayedShowDropDown) {
// Async because we're likely in a middle of a scroll here so
// frame/view positions are in flux.
RefPtr<nsResizeDropdownAtFinalPosition> resize =
new nsResizeDropdownAtFinalPosition(this);
NS_DispatchToCurrentThread(resize);
}
}
//----------------------------------------------------------
//
//----------------------------------------------------------
#ifdef DO_REFLOW_DEBUG
static int myCounter = 0;
static void printSize(char* aDesc, nscoord aSize) {
printf(" %s: ", aDesc);
if (aSize == NS_UNCONSTRAINEDSIZE) {
printf("UC");
} else {
printf("%d", PX(aSize));
}
}
#endif
//-------------------------------------------------------------------
//-- Main Reflow for the Combobox
//-------------------------------------------------------------------
bool nsComboboxControlFrame::HasDropDownButton() const {
const nsStyleDisplay* disp = StyleDisplay();
// FIXME(emilio): Blink also shows this for menulist-button and such... Seems
// more similar to our mac / linux implementation.
return disp->EffectiveAppearance() == StyleAppearance::Menulist &&
(!IsThemed(disp) ||
PresContext()->Theme()->ThemeNeedsComboboxDropmarker());
}
nscoord nsComboboxControlFrame::DropDownButtonISize() {
if (!HasDropDownButton()) {
return 0;
}
LayoutDeviceIntSize dropdownButtonSize;
bool canOverride = true;
nsPresContext* presContext = PresContext();
presContext->Theme()->GetMinimumWidgetSize(
presContext, this, StyleAppearance::MozMenulistArrowButton,
&dropdownButtonSize, &canOverride);
return presContext->DevPixelsToAppUnits(dropdownButtonSize.width);
}
nscoord nsComboboxControlFrame::GetIntrinsicISize(gfxContext* aRenderingContext,
IntrinsicISizeType aType) {
MOZ_ASSERT(mDropdownFrame, "No dropdown frame!");
// get the scrollbar width, we'll use this later
nscoord scrollbarWidth = 0;
nsPresContext* presContext = PresContext();
scrollbarWidth = mDropdownFrame->GetNondisappearingScrollbarWidth(
presContext, aRenderingContext, GetWritingMode());
const bool isContainSize = StyleDisplay()->IsContainSize();
nscoord displayISize = 0;
if (MOZ_LIKELY(mDisplayFrame)) {
if (isContainSize) {
// Get padding from the inline-axis
displayISize = mDisplayFrame->IntrinsicISizeOffsets().padding;
} else {
displayISize = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
mDisplayFrame, aType);
}
}
if (mDropdownFrame) {
nscoord dropdownContentISize;
bool isUsingOverlayScrollbars =
LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars) != 0;
if (aType == IntrinsicISizeType::MinISize) {
dropdownContentISize =
isContainSize ? 0 : mDropdownFrame->GetMinISize(aRenderingContext);
if (isUsingOverlayScrollbars) {
dropdownContentISize += scrollbarWidth;
}
} else {
NS_ASSERTION(aType == IntrinsicISizeType::PrefISize, "Unexpected type");
dropdownContentISize =
isContainSize ? 0 : mDropdownFrame->GetPrefISize(aRenderingContext);
if (isUsingOverlayScrollbars) {
dropdownContentISize += scrollbarWidth;
}
}
dropdownContentISize = NSCoordSaturatingSubtract(
dropdownContentISize, scrollbarWidth, nscoord_MAX);
displayISize = std::max(dropdownContentISize, displayISize);
}
// Add room for the dropmarker button if there is one.
displayISize += DropDownButtonISize();
return displayISize;
}
nscoord nsComboboxControlFrame::GetMinISize(gfxContext* aRenderingContext) {
nscoord minISize;
DISPLAY_MIN_INLINE_SIZE(this, minISize);
minISize = GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::MinISize);
return minISize;
}
nscoord nsComboboxControlFrame::GetPrefISize(gfxContext* aRenderingContext) {
nscoord prefISize;
DISPLAY_PREF_INLINE_SIZE(this, prefISize);
prefISize =
GetIntrinsicISize(aRenderingContext, IntrinsicISizeType::PrefISize);
return prefISize;
}
void nsComboboxControlFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
// Constraints we try to satisfy:
// 1) Default inline size of button is the vertical scrollbar size
// 2) If the inline size of button is bigger than our inline size, set
// inline size of button to 0.
// 3) Default block size of button is block size of display area
// 4) Inline size of display area is whatever is left over from our
// inline size after allocating inline size for the button.
// 5) Block Size of display area is GetBSizeOfARow() on the
// mDropdownFrame.
if (!mDisplayFrame || !mButtonFrame || !mDropdownFrame) {
NS_ERROR("Why did the frame constructor allow this to happen? Fix it!!");
return;
}
// Make sure the displayed text is the same as the selected option,
// bug 297389.
if (!mDroppedDown) {
mDisplayedIndex = mDropdownFrame->GetSelectedIndex();
}
// In dropped down mode the "selected index" is the hovered menu item,
// we want the last selected item which is |mDisplayedIndex| in this case.
RedisplayText();
// First reflow our dropdown so that we know how tall we should be.
ReflowDropdown(aPresContext, aReflowInput);
RefPtr<nsResizeDropdownAtFinalPosition> resize =
new nsResizeDropdownAtFinalPosition(this);
if (NS_SUCCEEDED(aPresContext->PresShell()->PostReflowCallback(resize))) {
// The reflow callback queue doesn't AddRef so we keep it alive until
// it's released in its ReflowFinished / ReflowCallbackCanceled.
Unused << resize.forget();
}
WritingMode wm = aReflowInput.GetWritingMode();
// Check if the theme specifies a minimum size for the dropdown button
// first.
const nscoord buttonISize = DropDownButtonISize();
const auto borderPadding = aReflowInput.ComputedLogicalBorderPadding(wm);
const auto padding = aReflowInput.ComputedLogicalPadding(wm);
const auto border = borderPadding - padding;
mDisplayISize = aReflowInput.ComputedISize() - buttonISize;
mMaxDisplayISize = mDisplayISize + padding.IEnd(wm);
nsBlockFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, aStatus);
// The button should occupy the same space as a scrollbar, and its position
// starts from the border edge.
LogicalRect buttonRect(wm);
buttonRect.IStart(wm) = borderPadding.IStart(wm) + mMaxDisplayISize;
buttonRect.BStart(wm) = border.BStart(wm);
buttonRect.ISize(wm) = buttonISize;
buttonRect.BSize(wm) = mDisplayFrame->BSize(wm) + padding.BStartEnd(wm);
const nsSize containerSize = aDesiredSize.PhysicalSize();
mButtonFrame->SetRect(buttonRect, containerSize);
if (!aStatus.IsInlineBreakBefore() && !aStatus.IsFullyComplete()) {
// This frame didn't fit inside a fragmentation container. Splitting
// a nsComboboxControlFrame makes no sense, so we override the status here.
aStatus.Reset();
}
}
//--------------------------------------------------------------
#ifdef DEBUG_FRAME_DUMP
nsresult nsComboboxControlFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"ComboboxControl"_ns, aResult);
}
#endif
void nsComboboxControlFrame::ShowDropDown(bool aDoDropDown) {
MOZ_ASSERT(!XRE_IsContentProcess());
mDelayedShowDropDown = false;
EventStates eventStates = mContent->AsElement()->State();
if (aDoDropDown && eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return;
}
if (!mDroppedDown && aDoDropDown) {
nsFocusManager* fm = nsFocusManager::GetFocusManager();
if (!fm || fm->GetFocusedElement() == GetContent()) {
DropDownPositionState state = AbsolutelyPositionDropDown();
if (state == eDropDownPositionFinal) {
ShowList(aDoDropDown); // might destroy us
} else if (state == eDropDownPositionPendingResize) {
// Delay until after the resize reflow, see nsAsyncResize.
mDelayedShowDropDown = true;
}
} else {
// Delay until we get focus, see SetFocus().
mDelayedShowDropDown = true;
}
} else if (mDroppedDown && !aDoDropDown) {
ShowList(aDoDropDown); // might destroy us
}
}
void nsComboboxControlFrame::SetDropDown(nsListControlFrame* aDropDownFrame) {
mDropdownFrame = aDropDownFrame;
if (!sFocused && nsContentUtils::IsFocusedContent(GetContent())) {
sFocused = this;
nsListControlFrame::ComboboxFocusSet();
}
}
nsIFrame* nsComboboxControlFrame::GetDropDown() { return mDropdownFrame; }
///////////////////////////////////////////////////////////////
nsresult nsComboboxControlFrame::RedisplaySelectedText() {
nsAutoScriptBlocker scriptBlocker;
mDisplayedIndex = mDropdownFrame->GetSelectedIndex();
return RedisplayText();
}
nsresult nsComboboxControlFrame::RedisplayText() {
nsString previewValue;
nsString previousText(mDisplayedOptionTextOrPreview);
auto* selectElement = static_cast<dom::HTMLSelectElement*>(GetContent());
selectElement->GetPreviewValue(previewValue);
// Get the text to display
if (!previewValue.IsEmpty()) {
mDisplayedOptionTextOrPreview = previewValue;
} else if (mDisplayedIndex != -1 && !StyleContent()->mContent.IsNone()) {
mDropdownFrame->GetOptionText(mDisplayedIndex,
mDisplayedOptionTextOrPreview);
} else {
mDisplayedOptionTextOrPreview.Truncate();
}
REFLOW_DEBUG_MSG2(
"RedisplayText \"%s\"\n",
NS_LossyConvertUTF16toASCII(mDisplayedOptionTextOrPreview).get());
// Send reflow command because the new text maybe larger
nsresult rv = NS_OK;
if (mDisplayContent && !previousText.Equals(mDisplayedOptionTextOrPreview)) {
// Don't call ActuallyDisplayText(true) directly here since that
// could cause recursive frame construction. See bug 283117 and the comment
// in HandleRedisplayTextEvent() below.
// Revoke outstanding events to avoid out-of-order events which could mean
// displaying the wrong text.
mRedisplayTextEvent.Revoke();
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"If we happen to run our redisplay event now, we might kill "
"ourselves!");
mRedisplayTextEvent = new RedisplayTextEvent(this);
nsContentUtils::AddScriptRunner(mRedisplayTextEvent.get());
}
return rv;
}
void nsComboboxControlFrame::HandleRedisplayTextEvent() {
// First, make sure that the content model is up to date and we've
// constructed the frames for all our content in the right places.
// Otherwise they'll end up under the wrong insertion frame when we
// ActuallyDisplayText, since that flushes out the content sink by
// calling SetText on a DOM node with aNotify set to true. See bug
// 289730.
AutoWeakFrame weakThis(this);
PresContext()->Document()->FlushPendingNotifications(
FlushType::ContentAndNotify);
if (!weakThis.IsAlive()) return;
// Redirect frame insertions during this method (see
// GetContentInsertionFrame()) so that any reframing that the frame
// constructor forces upon us is inserted into the correct parent
// (mDisplayFrame). See bug 282607.
MOZ_ASSERT(!mInRedisplayText, "Nested RedisplayText");
mInRedisplayText = true;
mRedisplayTextEvent.Forget();
ActuallyDisplayText(true);
if (!weakThis.IsAlive()) {
return;
}
// XXXbz This should perhaps be eResize. Check.
PresShell()->FrameNeedsReflow(mDisplayFrame, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
mInRedisplayText = false;
}
void nsComboboxControlFrame::ActuallyDisplayText(bool aNotify) {
RefPtr<nsTextNode> displayContent = mDisplayContent;
if (mDisplayedOptionTextOrPreview.IsEmpty()) {
// Have to use a space character of some sort for line-block-size
// calculations to be right. Also, the space character must be zero-width
// in order for the the inline-size calculations to be consistent between
// size-contained comboboxes vs. empty comboboxes.
//
// XXXdholbert Does this space need to be "non-breaking"? I'm not sure
// if it matters, but we previously had a comment here (added in 2002)
// saying "Have to use a non-breaking space for line-height calculations
// to be right". So I'll stick with a non-breaking space for now...
static const char16_t space = 0xFEFF;
displayContent->SetText(&space, 1, aNotify);
} else {
displayContent->SetText(mDisplayedOptionTextOrPreview, aNotify);
}
}
int32_t nsComboboxControlFrame::GetIndexOfDisplayArea() {
return mDisplayedIndex;
}
//----------------------------------------------------------------------
// nsISelectControlFrame
//----------------------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::DoneAddingChildren(bool aIsDone) {
return mDropdownFrame->DoneAddingChildren(aIsDone);
}
NS_IMETHODIMP
nsComboboxControlFrame::AddOption(int32_t aIndex) {
if (aIndex <= mDisplayedIndex) {
++mDisplayedIndex;
}
return mDropdownFrame->AddOption(aIndex);
}
NS_IMETHODIMP
nsComboboxControlFrame::RemoveOption(int32_t aIndex) {
AutoWeakFrame weakThis(this);
if (mDropdownFrame->GetNumberOfOptions() > 0) {
if (aIndex < mDisplayedIndex) {
--mDisplayedIndex;
} else if (aIndex == mDisplayedIndex) {
mDisplayedIndex = 0; // IE6 compat
RedisplayText();
}
} else {
// If we removed the last option, we need to blank things out
mDisplayedIndex = -1;
RedisplayText();
}
if (!weakThis.IsAlive()) return NS_OK;
return mDropdownFrame->RemoveOption(aIndex);
}
NS_IMETHODIMP_(void)
nsComboboxControlFrame::OnSetSelectedIndex(int32_t aOldIndex,
int32_t aNewIndex) {
nsAutoScriptBlocker scriptBlocker;
mDisplayedIndex = aNewIndex;
RedisplayText();
MOZ_ASSERT(mDropdownFrame, "No dropdown frame!");
return mDropdownFrame->OnSetSelectedIndex(aOldIndex, aNewIndex);
}
// End nsISelectControlFrame
//----------------------------------------------------------------------
nsresult nsComboboxControlFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return NS_OK;
}
#if COMBOBOX_ROLLUP_CONSUME_EVENT == 0
if (aEvent->mMessage == eMouseDown) {
if (GetContent() == mozilla::widget::nsAutoRollup::GetLastRollup()) {
// This event did a Rollup on this control - prevent it from opening
// the dropdown again!
*aEventStatus = nsEventStatus_eConsumeNoDefault;
return NS_OK;
}
}
#endif
// If we have style that affects how we are selected, feed event down to
// nsIFrame::HandleEvent so that selection takes place when appropriate.
if (IsContentDisabled()) {
return nsBlockFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
nsresult nsComboboxControlFrame::SetFormProperty(nsAtom* aName,
const nsAString& aValue) {
return mDropdownFrame->SetFormProperty(aName, aValue);
}
nsContainerFrame* nsComboboxControlFrame::GetContentInsertionFrame() {
return mInRedisplayText ? mDisplayFrame
: mDropdownFrame->GetContentInsertionFrame();
}
void nsComboboxControlFrame::AppendDirectlyOwnedAnonBoxes(
nsTArray<OwnedAnonBox>& aResult) {
aResult.AppendElement(OwnedAnonBox(mDropdownFrame));
aResult.AppendElement(OwnedAnonBox(mDisplayFrame));
}
nsresult nsComboboxControlFrame::CreateAnonymousContent(
nsTArray<ContentInfo>& aElements) {
// The frames used to display the combo box and the button used to popup the
// dropdown list are created through anonymous content. The dropdown list is
// not created through anonymous content because its frame is initialized
// specifically for the drop-down case and it is placed a special list
// referenced through NS_COMBO_FRAME_POPUP_LIST_INDEX to keep separate from
// the layout of the display and button.
//
// Note: The value attribute of the display content is set when an item is
// selected in the dropdown list. If the content specified below does not
// honor the value attribute than nothing will be displayed.
// For now the content that is created corresponds to two input buttons. It
// would be better to create the tag as something other than input, but then
// there isn't any way to create a button frame since it isn't possible to set
// the display type in CSS2 to create a button frame.
// create content used for display
// nsAtom* tag = NS_Atomize("mozcombodisplay");
// Add a child text content node for the label
nsNodeInfoManager* nimgr = mContent->NodeInfo()->NodeInfoManager();
mDisplayContent = new (nimgr) nsTextNode(nimgr);
// set the value of the text node
mDisplayedIndex = mDropdownFrame->GetSelectedIndex();
if (mDisplayedIndex != -1) {
mDropdownFrame->GetOptionText(mDisplayedIndex,
mDisplayedOptionTextOrPreview);
}
ActuallyDisplayText(false);
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
aElements.AppendElement(mDisplayContent);
mButtonContent = mContent->OwnerDoc()->CreateHTMLElement(nsGkAtoms::button);
if (!mButtonContent) return NS_ERROR_OUT_OF_MEMORY;
// make someone to listen to the button. If its pressed by someone like
// Accessibility then open or close the combo box.
mButtonListener = new nsComboButtonListener(this);
mButtonContent->AddEventListener(u"click"_ns, mButtonListener, false, false);
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::type, u"button"_ns,
false);
// Set tabindex="-1" so that the button is not tabbable
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::tabindex, u"-1"_ns,
false);
WritingMode wm = GetWritingMode();
if (wm.IsVertical()) {
mButtonContent->SetAttr(kNameSpaceID_None, nsGkAtoms::orientation,
wm.IsVerticalRL() ? u"left"_ns : u"right"_ns,
false);
}
// XXX(Bug 1631371) Check if this should use a fallible operation as it
// pretended earlier.
aElements.AppendElement(mButtonContent);
return NS_OK;
}
void nsComboboxControlFrame::AppendAnonymousContentTo(
nsTArray<nsIContent*>& aElements, uint32_t aFilter) {
if (mDisplayContent) {
aElements.AppendElement(mDisplayContent);
}
if (mButtonContent) {
aElements.AppendElement(mButtonContent);
}
}
nsIContent* nsComboboxControlFrame::GetDisplayNode() const {
return mDisplayContent;
}
// XXXbz this is a for-now hack. Now that display:inline-block works,
// need to revisit this.
class nsComboboxDisplayFrame final : public nsBlockFrame {
public:
NS_DECL_FRAMEARENA_HELPERS(nsComboboxDisplayFrame)
nsComboboxDisplayFrame(ComputedStyle* aStyle,
nsComboboxControlFrame* aComboBox)
: nsBlockFrame(aStyle, aComboBox->PresContext(), kClassID),
mComboBox(aComboBox) {}
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const final {
return MakeFrameName(u"ComboboxDisplay"_ns, aResult);
}
#endif
bool IsFrameOfType(uint32_t aFlags) const final {
return nsBlockFrame::IsFrameOfType(aFlags &
~(nsIFrame::eReplacedContainsBlock));
}
void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput, nsReflowStatus& aStatus) final;
void BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) final;
protected:
nsComboboxControlFrame* mComboBox;
};
NS_IMPL_FRAMEARENA_HELPERS(nsComboboxDisplayFrame)
void nsComboboxDisplayFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
MOZ_ASSERT(aReflowInput.mParentReflowInput &&
aReflowInput.mParentReflowInput->mFrame == mComboBox,
"Combobox's frame tree is wrong!");
ReflowInput state(aReflowInput);
if (state.ComputedBSize() == NS_UNCONSTRAINEDSIZE) {
state.SetLineHeight(state.mParentReflowInput->GetLineHeight());
}
const WritingMode wm = aReflowInput.GetWritingMode();
const LogicalMargin bp = state.ComputedLogicalBorderPadding(wm);
MOZ_ASSERT(bp.BStartEnd(wm) == 0,
"We shouldn't have border and padding in the block axis in UA!");
nscoord inlineBp = bp.IStartEnd(wm);
nscoord computedISize = mComboBox->mDisplayISize - inlineBp;
// Other UAs ignore padding in some (but not all) platforms for (themed only)
// comboboxes. Instead of doing that, we prevent that padding if present from
// clipping the display text, by enforcing the display text minimum size in
// that situation.
const bool shouldHonorMinISize =
mComboBox->StyleDisplay()->EffectiveAppearance() ==
StyleAppearance::Menulist;
if (shouldHonorMinISize) {
computedISize = std::max(state.ComputedMinISize(), computedISize);
// Don't let this size go over mMaxDisplayISize, since that'd be
// observable via clientWidth / scrollWidth.
computedISize =
std::min(computedISize, mComboBox->mMaxDisplayISize - inlineBp);
}
state.SetComputedISize(std::max(0, computedISize));
nsBlockFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
aStatus.Reset(); // this type of frame can't be split
}
void nsComboboxDisplayFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
nsDisplayListCollection set(aBuilder);
nsBlockFrame::BuildDisplayList(aBuilder, set);
// remove background items if parent frame is themed
if (mComboBox->IsThemed()) {
set.BorderBackground()->DeleteAll(aBuilder);
}
set.MoveTo(aLists);
}
nsIFrame* nsComboboxControlFrame::CreateFrameForDisplayNode() {
MOZ_ASSERT(mDisplayContent);
// Get PresShell
mozilla::PresShell* presShell = PresShell();
ServoStyleSet* styleSet = presShell->StyleSet();
// create the ComputedStyle for the anonymous block frame and text frame
RefPtr<ComputedStyle> computedStyle;
computedStyle = styleSet->ResolveInheritingAnonymousBoxStyle(
PseudoStyleType::mozDisplayComboboxControlFrame, mComputedStyle);
RefPtr<ComputedStyle> textComputedStyle;
textComputedStyle =
styleSet->ResolveStyleForText(mDisplayContent, mComputedStyle);
// Start by creating our anonymous block frame
mDisplayFrame = new (presShell) nsComboboxDisplayFrame(computedStyle, this);
mDisplayFrame->Init(mContent, this, nullptr);
// Create a text frame and put it inside the block frame
nsIFrame* textFrame = NS_NewTextFrame(presShell, textComputedStyle);
// initialize the text frame
textFrame->Init(mDisplayContent, mDisplayFrame, nullptr);
mDisplayContent->SetPrimaryFrame(textFrame);
nsFrameList textList(textFrame, textFrame);
mDisplayFrame->SetInitialChildList(kPrincipalList, textList);
return mDisplayFrame;
}
nsIScrollableFrame* nsComboboxControlFrame::GetScrollTargetFrame() const {
return mDropdownFrame;
}
void nsComboboxControlFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
if (sFocused == this) {
sFocused = nullptr;
}
// Revoke any pending RedisplayTextEvent
mRedisplayTextEvent.Revoke();
if (mDroppedDown) {
MOZ_ASSERT(mDropdownFrame, "mDroppedDown without frame");
nsView* view = mDropdownFrame->GetView();
MOZ_ASSERT(view);
nsIWidget* widget = view->GetWidget();
if (widget) {
widget->CaptureRollupEvents(this, false);
}
}
// Cleanup frames in popup child list
mPopupFrames.DestroyFramesFrom(aDestructRoot, aPostDestroyData);
aPostDestroyData.AddAnonymousContent(mDisplayContent.forget());
aPostDestroyData.AddAnonymousContent(mButtonContent.forget());
nsBlockFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
const nsFrameList& nsComboboxControlFrame::GetChildList(
ChildListID aListID) const {
if (kSelectPopupList == aListID) {
return mPopupFrames;
}
return nsBlockFrame::GetChildList(aListID);
}
void nsComboboxControlFrame::GetChildLists(nsTArray<ChildList>* aLists) const {
nsBlockFrame::GetChildLists(aLists);
mPopupFrames.AppendIfNonempty(aLists, kSelectPopupList);
}
void nsComboboxControlFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) {
#ifdef DEBUG
for (nsIFrame* f : aChildList) {
MOZ_ASSERT(f->GetParent() == this, "Unexpected parent");
}
#endif
if (kSelectPopupList == aListID) {
mPopupFrames.SetFrames(aChildList);
} else {
for (nsFrameList::Enumerator e(aChildList); !e.AtEnd(); e.Next()) {
nsCOMPtr<nsIFormControl> formControl =
do_QueryInterface(e.get()->GetContent());
if (formControl &&
formControl->ControlType() == FormControlType::ButtonButton) {
mButtonFrame = e.get();
break;
}
}
NS_ASSERTION(mButtonFrame, "missing button frame in initial child list");
nsBlockFrame::SetInitialChildList(aListID, aChildList);
}
}
//----------------------------------------------------------------------
// nsIRollupListener
//----------------------------------------------------------------------
bool nsComboboxControlFrame::Rollup(uint32_t aCount, bool aFlush,
const LayoutDeviceIntPoint* pos,
nsIContent** aLastRolledUp) {
if (aLastRolledUp) {
*aLastRolledUp = nullptr;
}
if (!mDroppedDown) {
return false;
}
bool consume = !!COMBOBOX_ROLLUP_CONSUME_EVENT;
AutoWeakFrame weakFrame(this);
mDropdownFrame->AboutToRollup(); // might destroy us
if (!weakFrame.IsAlive()) {
return consume;
}
ShowDropDown(false); // might destroy us
if (weakFrame.IsAlive()) {
mDropdownFrame->CaptureMouseEvents(false);
}
if (aFlush && weakFrame.IsAlive()) {
// The popup's visibility doesn't update until the minimize animation has
// finished, so call UpdateWidgetGeometry to update it right away.
RefPtr<nsViewManager> viewManager =
mDropdownFrame->GetView()->GetViewManager();
viewManager->UpdateWidgetGeometry(); // might destroy us
}
if (!weakFrame.IsAlive()) {
return consume;
}
if (aLastRolledUp) {
*aLastRolledUp = GetContent();
}
return consume;
}
nsIWidget* nsComboboxControlFrame::GetRollupWidget() {
nsView* view = mDropdownFrame->GetView();
MOZ_ASSERT(view);
return view->GetWidget();
}
void nsComboboxControlFrame::RollupFromList() {
if (ShowList(false)) {
mDropdownFrame->CaptureMouseEvents(false);
}
}
int32_t nsComboboxControlFrame::UpdateRecentIndex(int32_t aIndex) {
int32_t index = mRecentSelectedIndex;
if (mRecentSelectedIndex == NS_SKIP_NOTIFY_INDEX ||
aIndex == NS_SKIP_NOTIFY_INDEX)
mRecentSelectedIndex = aIndex;
return index;
}
namespace mozilla {
class nsDisplayComboboxFocus : public nsPaintedDisplayItem {
public:
nsDisplayComboboxFocus(nsDisplayListBuilder* aBuilder,
nsComboboxControlFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayComboboxFocus);
}
MOZ_COUNTED_DTOR_OVERRIDE(nsDisplayComboboxFocus)
void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
NS_DISPLAY_DECL_NAME("ComboboxFocus", TYPE_COMBOBOX_FOCUS)
};
void nsDisplayComboboxFocus::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
static_cast<nsComboboxControlFrame*>(mFrame)->PaintFocus(
*aCtx->GetDrawTarget(), ToReferenceFrame());
}
} // namespace mozilla
void nsComboboxControlFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (aBuilder->IsForEventDelivery()) {
// Don't allow children to receive events.
// REVIEW: following old GetFrameForPoint
DisplayBorderBackgroundOutline(aBuilder, aLists);
} else {
// REVIEW: Our in-flow child frames are inline-level so they will paint in
// our content list, so we don't need to mess with layers.
nsBlockFrame::BuildDisplayList(aBuilder, aLists);
}
// draw a focus indicator only when focus rings should be drawn
if (mContent->AsElement()->State().HasState(NS_EVENT_STATE_FOCUSRING)) {
nsPresContext* pc = PresContext();
const nsStyleDisplay* disp = StyleDisplay();
if (IsThemed(disp) &&
pc->Theme()->ThemeWantsButtonInnerFocusRing(
disp->EffectiveAppearance()) &&
mDisplayFrame && IsVisibleForPainting()) {
aLists.Content()->AppendNewToTop<nsDisplayComboboxFocus>(aBuilder, this);
}
}
DisplaySelectionOverlay(aBuilder, aLists.Content());
}
void nsComboboxControlFrame::PaintFocus(DrawTarget& aDrawTarget, nsPoint aPt) {
/* Do we need to do anything? */
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED) || sFocused != this) return;
int32_t appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
nsRect clipRect = mDisplayFrame->GetRect() + aPt;
aDrawTarget.PushClipRect(
NSRectToSnappedRect(clipRect, appUnitsPerDevPixel, aDrawTarget));
// REVIEW: Why does the old code paint mDisplayFrame again? We've
// already painted it in the children above. So clipping it here won't do
// us much good.
/////////////////////
// draw focus
StrokeOptions strokeOptions;
nsLayoutUtils::InitDashPattern(strokeOptions, StyleBorderStyle::Dotted);
ColorPattern color(ToDeviceColor(StyleText()->mColor));
nscoord onePixel = nsPresContext::CSSPixelsToAppUnits(1);
clipRect.width -= onePixel;
clipRect.height -= onePixel;
Rect r = ToRect(nsLayoutUtils::RectToGfxRect(clipRect, appUnitsPerDevPixel));
StrokeSnappedEdgesOfRect(r, aDrawTarget, color, strokeOptions);
aDrawTarget.PopClip();
}
//---------------------------------------------------------
// gets the content (an option) by index and then set it as
// being selected or not selected
//---------------------------------------------------------
NS_IMETHODIMP
nsComboboxControlFrame::OnOptionSelected(int32_t aIndex, bool aSelected) {
if (mDroppedDown) {
mDropdownFrame->OnOptionSelected(aIndex, aSelected);
} else {
if (aSelected) {
nsAutoScriptBlocker blocker;
mDisplayedIndex = aIndex;
RedisplayText();
} else {
AutoWeakFrame weakFrame(this);
RedisplaySelectedText();
if (weakFrame.IsAlive()) {
FireValueChangeEvent(); // Fire after old option is unselected
}
}
}
return NS_OK;
}
void nsComboboxControlFrame::FireValueChangeEvent() {
// Fire ValueChange event to indicate data value of combo box has changed
nsContentUtils::AddScriptRunner(new AsyncEventDispatcher(
mContent, u"ValueChange"_ns, CanBubble::eYes, ChromeOnlyDispatch::eNo));
}
void nsComboboxControlFrame::OnContentReset() {
mDropdownFrame->OnContentReset();
}
//--------------------------------------------------------
// nsIStatefulFrame
//--------------------------------------------------------
UniquePtr<PresState> nsComboboxControlFrame::SaveState() {
UniquePtr<PresState> state = NewPresState();
state->droppedDown() = mDroppedDown;
return state;
}
NS_IMETHODIMP
nsComboboxControlFrame::RestoreState(PresState* aState) {
if (!aState) {
return NS_ERROR_FAILURE;
}
ShowList(aState->droppedDown()); // might destroy us
return NS_OK;
}
// Append a suffix so that the state key for the combobox is different
// from the state key the list control uses to sometimes save the scroll
// position for the same Element
void nsComboboxControlFrame::GenerateStateKey(nsIContent* aContent,
Document* aDocument,
nsACString& aKey) {
nsContentUtils::GenerateStateKey(aContent, aDocument, aKey);
if (aKey.IsEmpty()) {
return;
}
aKey.AppendLiteral("CCF");
}
// Fennec uses a custom combobox built-in widget.
//
/* static */
bool nsComboboxControlFrame::ToolkitHasNativePopup() {
#ifdef MOZ_USE_NATIVE_POPUP_WINDOWS
return true;
#else
return false;
#endif /* MOZ_USE_NATIVE_POPUP_WINDOWS */
}
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