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gecko-dev/layout/base/nsPresContext.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/* a presentation of a document, part 1 */
#ifndef nsPresContext_h___
#define nsPresContext_h___
#include "mozilla/Attributes.h"
#include "nsISupports.h"
#include "nsColor.h"
#include "nsCoord.h"
#include "nsCOMPtr.h"
#include "nsIPresShell.h"
#include "nsRect.h"
#include "nsDeviceContext.h"
#include "nsFont.h"
#include "nsIObserver.h"
#include "nsITimer.h"
#include "nsCRT.h"
#include "FramePropertyTable.h"
#include "nsGkAtoms.h"
#include "nsRefPtrHashtable.h"
#include "nsCycleCollectionParticipant.h"
#include "nsChangeHint.h"
// This also pulls in gfxTypes.h, which we cannot include directly.
#include "gfxRect.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsIWidget.h"
#include "mozilla/TimeStamp.h"
#include "prclist.h"
#include "Layers.h"
#ifdef IBMBIDI
class nsBidiPresUtils;
#endif // IBMBIDI
struct nsRect;
class imgIRequest;
class nsAString;
class nsIPrintSettings;
class nsIDocument;
class nsILanguageAtomService;
class nsITheme;
class nsIContent;
class nsFontMetrics;
class nsIFrame;
class nsFrameManager;
class nsILinkHandler;
class nsStyleContext;
class nsIAtom;
class nsEventStateManager;
class nsIURI;
class nsICSSPseudoComparator;
struct nsStyleBackground;
struct nsStyleBorder;
class nsIRunnable;
class gfxUserFontSet;
class nsUserFontSet;
struct nsFontFaceRuleContainer;
class nsObjectFrame;
class nsTransitionManager;
class nsAnimationManager;
class nsRefreshDriver;
class imgIContainer;
class nsIDOMMediaQueryList;
#ifdef MOZ_REFLOW_PERF
class nsRenderingContext;
#endif
// supported values for cached bool types
enum nsPresContext_CachedBoolPrefType {
kPresContext_UseDocumentColors = 1,
kPresContext_UseDocumentFonts,
kPresContext_UnderlineLinks
};
// supported values for cached integer pref types
enum nsPresContext_CachedIntPrefType {
kPresContext_ScrollbarSide = 1,
kPresContext_BidiDirection
};
// IDs for the default variable and fixed fonts (not to be changed, see nsFont.h)
// To be used for Get/SetDefaultFont(). The other IDs in nsFont.h are also supported.
const uint8_t kPresContext_DefaultVariableFont_ID = 0x00; // kGenericFont_moz_variable
const uint8_t kPresContext_DefaultFixedFont_ID = 0x01; // kGenericFont_moz_fixed
#ifdef DEBUG
struct nsAutoLayoutPhase;
enum nsLayoutPhase {
eLayoutPhase_Paint,
eLayoutPhase_Reflow,
eLayoutPhase_FrameC,
eLayoutPhase_COUNT
};
#endif
class nsInvalidateRequestList {
public:
struct Request {
nsRect mRect;
uint32_t mFlags;
};
nsTArray<Request> mRequests;
};
/**
* Layer UserData for ContainerLayers that want to be notified
* of local invalidations of them and their descendant layers.
* Pass a callback to ComputeDifferences to have these called.
*/
class ContainerLayerPresContext : public mozilla::layers::LayerUserData {
public:
nsPresContext* mPresContext;
};
extern uint8_t gNotifySubDocInvalidationData;
/* Used by nsPresContext::HasAuthorSpecifiedRules */
#define NS_AUTHOR_SPECIFIED_BACKGROUND (1 << 0)
#define NS_AUTHOR_SPECIFIED_BORDER (1 << 1)
#define NS_AUTHOR_SPECIFIED_PADDING (1 << 2)
#define NS_AUTHOR_SPECIFIED_TEXT_SHADOW (1 << 3)
class nsRootPresContext;
// An interface for presentation contexts. Presentation contexts are
// objects that provide an outer context for a presentation shell.
class nsPresContext : public nsIObserver {
public:
typedef mozilla::FramePropertyTable FramePropertyTable;
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_NSIOBSERVER
NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW
NS_DECL_CYCLE_COLLECTION_CLASS(nsPresContext)
enum nsPresContextType {
eContext_Galley, // unpaginated screen presentation
eContext_PrintPreview, // paginated screen presentation
eContext_Print, // paginated printer presentation
eContext_PageLayout // paginated & editable.
};
nsPresContext(nsIDocument* aDocument, nsPresContextType aType) NS_HIDDEN;
/**
* Initialize the presentation context from a particular device.
*/
NS_HIDDEN_(nsresult) Init(nsDeviceContext* aDeviceContext);
/**
* Set the presentation shell that this context is bound to.
* A presentation context may only be bound to a single shell.
*/
NS_HIDDEN_(void) SetShell(nsIPresShell* aShell);
NS_HIDDEN_(nsPresContextType) Type() const { return mType; }
/**
* Get the PresentationShell that this context is bound to.
*/
nsIPresShell* PresShell() const
{
NS_ASSERTION(mShell, "Null pres shell");
return mShell;
}
nsIPresShell* GetPresShell() const { return mShell; }
/**
* Returns the parent prescontext for this one. Returns null if this is a
* root.
*/
nsPresContext* GetParentPresContext();
/**
* Returns the prescontext of the toplevel content document that contains
* this presentation, or null if there isn't one.
*/
nsPresContext* GetToplevelContentDocumentPresContext();
/**
* Return the presentation context for the root of the view manager
* hierarchy that contains this presentation context, or nullptr if it can't
* be found (e.g. it's detached).
*/
nsRootPresContext* GetRootPresContext();
nsRootPresContext* GetDisplayRootPresContext();
virtual bool IsRoot() { return false; }
nsIDocument* Document() const
{
NS_ASSERTION(!mShell || !mShell->GetDocument() ||
mShell->GetDocument() == mDocument,
"nsPresContext doesn't have the same document as nsPresShell!");
return mDocument;
}
#ifdef _IMPL_NS_LAYOUT
nsStyleSet* StyleSet() { return GetPresShell()->StyleSet(); }
nsFrameManager* FrameManager()
{ return GetPresShell()->FrameManager(); }
nsTransitionManager* TransitionManager() { return mTransitionManager; }
nsAnimationManager* AnimationManager() { return mAnimationManager; }
nsRefreshDriver* RefreshDriver() { return mRefreshDriver; }
#endif
/**
* Rebuilds all style data by throwing out the old rule tree and
* building a new one, and additionally applying aExtraHint (which
* must not contain nsChangeHint_ReconstructFrame) to the root frame.
* Also rebuild the user font set.
*/
void RebuildAllStyleData(nsChangeHint aExtraHint);
/**
* Just like RebuildAllStyleData, except (1) asynchronous and (2) it
* doesn't rebuild the user font set.
*/
void PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint);
void MediaFeatureValuesChanged(bool aCallerWillRebuildStyleData);
void PostMediaFeatureValuesChangedEvent();
NS_HIDDEN_(void) HandleMediaFeatureValuesChangedEvent();
void FlushPendingMediaFeatureValuesChanged() {
if (mPendingMediaFeatureValuesChanged)
MediaFeatureValuesChanged(false);
}
/**
* Support for window.matchMedia()
*/
void MatchMedia(const nsAString& aMediaQueryList,
nsIDOMMediaQueryList** aResult);
/**
* Access compatibility mode for this context. This is the same as
* our document's compatibility mode.
*/
nsCompatibility CompatibilityMode() const;
/**
* Notify the context that the document's compatibility mode has changed
*/
NS_HIDDEN_(void) CompatibilityModeChanged();
/**
* Access the image animation mode for this context
*/
uint16_t ImageAnimationMode() const { return mImageAnimationMode; }
virtual NS_HIDDEN_(void) SetImageAnimationModeExternal(uint16_t aMode);
NS_HIDDEN_(void) SetImageAnimationModeInternal(uint16_t aMode);
#ifdef _IMPL_NS_LAYOUT
void SetImageAnimationMode(uint16_t aMode)
{ SetImageAnimationModeInternal(aMode); }
#else
void SetImageAnimationMode(uint16_t aMode)
{ SetImageAnimationModeExternal(aMode); }
#endif
/**
* Get medium of presentation
*/
nsIAtom* Medium() { return mMedium; }
void* AllocateFromShell(size_t aSize)
{
if (mShell)
return mShell->AllocateMisc(aSize);
return nullptr;
}
void FreeToShell(size_t aSize, void* aFreeChunk)
{
NS_ASSERTION(mShell, "freeing after shutdown");
if (mShell)
mShell->FreeMisc(aSize, aFreeChunk);
}
/**
* Get the default font for the given language and generic font ID.
* If aLanguage is nullptr, the document's language is used.
*
* This object is read-only, you must copy the font to modify it.
*
* When aFontID is kPresContext_DefaultVariableFontID or
* kPresContext_DefaultFixedFontID (which equals
* kGenericFont_moz_fixed, which is used for the -moz-fixed generic),
* the nsFont returned has its name as a CSS generic family (serif or
* sans-serif for the former, monospace for the latter), and its size
* as the default font size for variable or fixed fonts for the
* language group.
*
* For aFontID corresponding to a CSS Generic, the nsFont returned has
* its name set to that generic font's name, and its size set to
* the user's preference for font size for that generic and the
* given language.
*/
NS_HIDDEN_(const nsFont*) GetDefaultFont(uint8_t aFontID,
nsIAtom *aLanguage) const;
/** Get a cached boolean pref, by its type */
// * - initially created for bugs 31816, 20760, 22963
bool GetCachedBoolPref(nsPresContext_CachedBoolPrefType aPrefType) const
{
// If called with a constant parameter, the compiler should optimize
// this switch statement away.
switch (aPrefType) {
case kPresContext_UseDocumentFonts:
return mUseDocumentFonts;
case kPresContext_UseDocumentColors:
return mUseDocumentColors;
case kPresContext_UnderlineLinks:
return mUnderlineLinks;
default:
NS_ERROR("Invalid arg passed to GetCachedBoolPref");
}
return false;
}
/** Get a cached integer pref, by its type */
// * - initially created for bugs 30910, 61883, 74186, 84398
int32_t GetCachedIntPref(nsPresContext_CachedIntPrefType aPrefType) const
{
// If called with a constant parameter, the compiler should optimize
// this switch statement away.
switch (aPrefType) {
case kPresContext_ScrollbarSide:
return mPrefScrollbarSide;
case kPresContext_BidiDirection:
return mPrefBidiDirection;
default:
NS_ERROR("invalid arg passed to GetCachedIntPref");
}
return false;
}
/**
* Get the default colors
*/
const nscolor DefaultColor() const { return mDefaultColor; }
const nscolor DefaultBackgroundColor() const { return mBackgroundColor; }
const nscolor DefaultLinkColor() const { return mLinkColor; }
const nscolor DefaultActiveLinkColor() const { return mActiveLinkColor; }
const nscolor DefaultVisitedLinkColor() const { return mVisitedLinkColor; }
const nscolor FocusBackgroundColor() const { return mFocusBackgroundColor; }
const nscolor FocusTextColor() const { return mFocusTextColor; }
/**
* Body text color, for use in quirks mode only.
*/
const nscolor BodyTextColor() const { return mBodyTextColor; }
void SetBodyTextColor(nscolor aColor) { mBodyTextColor = aColor; }
bool GetUseFocusColors() const { return mUseFocusColors; }
uint8_t FocusRingWidth() const { return mFocusRingWidth; }
bool GetFocusRingOnAnything() const { return mFocusRingOnAnything; }
uint8_t GetFocusRingStyle() const { return mFocusRingStyle; }
NS_HIDDEN_(void) SetContainer(nsISupports* aContainer);
virtual NS_HIDDEN_(already_AddRefed<nsISupports>) GetContainerExternal() const;
NS_HIDDEN_(already_AddRefed<nsISupports>) GetContainerInternal() const;
#ifdef _IMPL_NS_LAYOUT
already_AddRefed<nsISupports> GetContainer() const
{ return GetContainerInternal(); }
#else
already_AddRefed<nsISupports> GetContainer() const
{ return GetContainerExternal(); }
#endif
// XXX this are going to be replaced with set/get container
void SetLinkHandler(nsILinkHandler* aHandler) { mLinkHandler = aHandler; }
nsILinkHandler* GetLinkHandler() { return mLinkHandler; }
/**
* Get the visible area associated with this presentation context.
* This is the size of the visible area that is used for
* presenting the document. The returned value is in the standard
* nscoord units (as scaled by the device context).
*/
nsRect GetVisibleArea() { return mVisibleArea; }
/**
* Set the currently visible area. The units for r are standard
* nscoord units (as scaled by the device context).
*/
void SetVisibleArea(const nsRect& r) {
if (!r.IsEqualEdges(mVisibleArea)) {
mVisibleArea = r;
// Visible area does not affect media queries when paginated.
if (!IsPaginated() && HasCachedStyleData())
PostMediaFeatureValuesChangedEvent();
}
}
/**
* Return true if this presentation context is a paginated
* context.
*/
bool IsPaginated() const { return mPaginated; }
/**
* Sets whether the presentation context can scroll for a paginated
* context.
*/
NS_HIDDEN_(void) SetPaginatedScrolling(bool aResult);
/**
* Return true if this presentation context can scroll for paginated
* context.
*/
bool HasPaginatedScrolling() const { return mCanPaginatedScroll; }
/**
* Get/set the size of a page
*/
nsSize GetPageSize() { return mPageSize; }
void SetPageSize(nsSize aSize) { mPageSize = aSize; }
/**
* Get/set whether this document should be treated as having real pages
* XXX This raises the obvious question of why a document that isn't a page
* is paginated; there isn't a good reason except history
*/
bool IsRootPaginatedDocument() { return mIsRootPaginatedDocument; }
void SetIsRootPaginatedDocument(bool aIsRootPaginatedDocument)
{ mIsRootPaginatedDocument = aIsRootPaginatedDocument; }
/**
* Get/set the print scaling level; used by nsPageFrame to scale up
* pages. Set safe to call before reflow, get guaranteed to be set
* properly after reflow.
*/
float GetPageScale() { return mPageScale; }
void SetPageScale(float aScale) { mPageScale = aScale; }
/**
* Get/set the scaling facor to use when rendering the pages for print preview.
* Only safe to get after print preview set up; safe to set anytime.
* This is a scaling factor for the display of the print preview. It
* does not affect layout. It only affects the size of the onscreen pages
* in print preview.
* XXX Temporary: see http://wiki.mozilla.org/Gecko:PrintPreview
*/
float GetPrintPreviewScale() { return mPPScale; }
void SetPrintPreviewScale(float aScale) { mPPScale = aScale; }
nsDeviceContext* DeviceContext() { return mDeviceContext; }
nsEventStateManager* EventStateManager() { return mEventManager; }
nsIAtom* GetLanguageFromCharset() { return mLanguage; }
float TextZoom() { return mTextZoom; }
void SetTextZoom(float aZoom) {
if (aZoom == mTextZoom)
return;
mTextZoom = aZoom;
if (HasCachedStyleData()) {
// Media queries could have changed, since we changed the meaning
// of 'em' units in them.
MediaFeatureValuesChanged(true);
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
}
/**
* Get the minimum font size for the specified language. If aLanguage
* is nullptr, then the document's language is used.
*/
int32_t MinFontSize(nsIAtom *aLanguage) const {
const LangGroupFontPrefs *prefs = GetFontPrefsForLang(aLanguage);
return NS_MAX(mMinFontSize, prefs->mMinimumFontSize);
}
void SetMinFontSize(int32_t aMinFontSize) {
if (aMinFontSize == mMinFontSize)
return;
mMinFontSize = aMinFontSize;
if (HasCachedStyleData()) {
// Media queries could have changed, since we changed the meaning
// of 'em' units in them.
MediaFeatureValuesChanged(true);
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
}
float GetFullZoom() { return mFullZoom; }
void SetFullZoom(float aZoom);
nscoord GetAutoQualityMinFontSize() {
return DevPixelsToAppUnits(mAutoQualityMinFontSizePixelsPref);
}
/**
* Return the device's screen width in inches, for font size
* inflation.
*
* If |aChanged| is non-null, then aChanged is filled in with whether
* the return value has changed since either:
* a. the last time the function was called with non-null aChanged, or
* b. the first time the function was called.
*/
float ScreenWidthInchesForFontInflation(bool* aChanged = nullptr);
static int32_t AppUnitsPerCSSPixel() { return nsDeviceContext::AppUnitsPerCSSPixel(); }
uint32_t AppUnitsPerDevPixel() const { return mDeviceContext->AppUnitsPerDevPixel(); }
static int32_t AppUnitsPerCSSInch() { return nsDeviceContext::AppUnitsPerCSSInch(); }
static nscoord CSSPixelsToAppUnits(int32_t aPixels)
{ return NSIntPixelsToAppUnits(aPixels,
nsDeviceContext::AppUnitsPerCSSPixel()); }
static nscoord CSSPixelsToAppUnits(float aPixels)
{ return NSFloatPixelsToAppUnits(aPixels,
float(nsDeviceContext::AppUnitsPerCSSPixel())); }
static int32_t AppUnitsToIntCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToIntPixels(aAppUnits,
float(nsDeviceContext::AppUnitsPerCSSPixel())); }
static float AppUnitsToFloatCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToFloatPixels(aAppUnits,
float(nsDeviceContext::AppUnitsPerCSSPixel())); }
nscoord DevPixelsToAppUnits(int32_t aPixels) const
{ return NSIntPixelsToAppUnits(aPixels,
mDeviceContext->AppUnitsPerDevPixel()); }
int32_t AppUnitsToDevPixels(nscoord aAppUnits) const
{ return NSAppUnitsToIntPixels(aAppUnits,
float(mDeviceContext->AppUnitsPerDevPixel())); }
int32_t CSSPixelsToDevPixels(int32_t aPixels)
{ return AppUnitsToDevPixels(CSSPixelsToAppUnits(aPixels)); }
float CSSPixelsToDevPixels(float aPixels)
{
return NSAppUnitsToFloatPixels(CSSPixelsToAppUnits(aPixels),
float(mDeviceContext->AppUnitsPerDevPixel()));
}
int32_t DevPixelsToIntCSSPixels(int32_t aPixels)
{ return AppUnitsToIntCSSPixels(DevPixelsToAppUnits(aPixels)); }
float DevPixelsToFloatCSSPixels(int32_t aPixels)
{ return AppUnitsToFloatCSSPixels(DevPixelsToAppUnits(aPixels)); }
// If there is a remainder, it is rounded to nearest app units.
nscoord GfxUnitsToAppUnits(gfxFloat aGfxUnits) const
{ return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits); }
gfxFloat AppUnitsToGfxUnits(nscoord aAppUnits) const
{ return mDeviceContext->AppUnitsToGfxUnits(aAppUnits); }
gfxRect AppUnitsToGfxUnits(const nsRect& aAppRect) const
{ return gfxRect(AppUnitsToGfxUnits(aAppRect.x),
AppUnitsToGfxUnits(aAppRect.y),
AppUnitsToGfxUnits(aAppRect.width),
AppUnitsToGfxUnits(aAppRect.height)); }
static nscoord CSSTwipsToAppUnits(float aTwips)
{ return NSToCoordRoundWithClamp(
nsDeviceContext::AppUnitsPerCSSInch() * NS_TWIPS_TO_INCHES(aTwips)); }
// Margin-specific version, since they often need TwipsToAppUnits
static nsMargin CSSTwipsToAppUnits(const nsIntMargin &marginInTwips)
{ return nsMargin(CSSTwipsToAppUnits(float(marginInTwips.left)),
CSSTwipsToAppUnits(float(marginInTwips.top)),
CSSTwipsToAppUnits(float(marginInTwips.right)),
CSSTwipsToAppUnits(float(marginInTwips.bottom))); }
static nscoord CSSPointsToAppUnits(float aPoints)
{ return NSToCoordRound(aPoints * nsDeviceContext::AppUnitsPerCSSInch() /
POINTS_PER_INCH_FLOAT); }
nscoord RoundAppUnitsToNearestDevPixels(nscoord aAppUnits) const
{ return DevPixelsToAppUnits(AppUnitsToDevPixels(aAppUnits)); }
struct ScrollbarStyles {
// Always one of NS_STYLE_OVERFLOW_SCROLL, NS_STYLE_OVERFLOW_HIDDEN,
// or NS_STYLE_OVERFLOW_AUTO.
uint8_t mHorizontal, mVertical;
ScrollbarStyles(uint8_t h, uint8_t v) : mHorizontal(h), mVertical(v) {}
ScrollbarStyles() {}
bool operator==(const ScrollbarStyles& aStyles) const {
return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical;
}
bool operator!=(const ScrollbarStyles& aStyles) const {
return aStyles.mHorizontal != mHorizontal || aStyles.mVertical != mVertical;
}
};
void SetViewportOverflowOverride(uint8_t aX, uint8_t aY)
{
mViewportStyleOverflow.mHorizontal = aX;
mViewportStyleOverflow.mVertical = aY;
}
ScrollbarStyles GetViewportOverflowOverride()
{
return mViewportStyleOverflow;
}
/**
* Set and get methods for controlling the background drawing
*/
bool GetBackgroundImageDraw() const { return mDrawImageBackground; }
void SetBackgroundImageDraw(bool aCanDraw)
{
mDrawImageBackground = aCanDraw;
}
bool GetBackgroundColorDraw() const { return mDrawColorBackground; }
void SetBackgroundColorDraw(bool aCanDraw)
{
mDrawColorBackground = aCanDraw;
}
#ifdef IBMBIDI
/**
* Check if bidi enabled (set depending on the presence of RTL
* characters or when default directionality is RTL).
* If enabled, we should apply the Unicode Bidi Algorithm
*
* @lina 07/12/2000
*/
#ifdef _IMPL_NS_LAYOUT
bool BidiEnabled() const { return BidiEnabledInternal(); }
#else
bool BidiEnabled() const { return BidiEnabledExternal(); }
#endif
virtual bool BidiEnabledExternal() const;
bool BidiEnabledInternal() const;
/**
* Set bidi enabled. This means we should apply the Unicode Bidi Algorithm
*
* @lina 07/12/2000
*/
NS_HIDDEN_(void) SetBidiEnabled() const;
/**
* Set visual or implicit mode into the pres context.
*
* Visual directionality is a presentation method that displays text
* as if it were a uni-directional, according to the primary display
* direction only.
*
* Implicit directionality is a presentation method in which the
* direction is determined by the Bidi algorithm according to the
* category of the characters and the category of the adjacent
* characters, and according to their primary direction.
*
* @lina 05/02/2000
*/
void SetVisualMode(bool aIsVisual)
{
mIsVisual = aIsVisual;
}
/**
* Check whether the content should be treated as visual.
*
* @lina 05/02/2000
*/
bool IsVisualMode() const { return mIsVisual; }
//Mohamed
/**
* Set the Bidi options for the presentation context
*/
NS_HIDDEN_(void) SetBidi(uint32_t aBidiOptions,
bool aForceRestyle = false);
/**
* Get the Bidi options for the presentation context
* Not inline so consumers of nsPresContext are not forced to
* include nsIDocument.
*/
NS_HIDDEN_(uint32_t) GetBidi() const;
#endif // IBMBIDI
/**
* Render only Selection
*/
void SetIsRenderingOnlySelection(bool aResult)
{
mIsRenderingOnlySelection = aResult;
}
bool IsRenderingOnlySelection() const { return mIsRenderingOnlySelection; }
NS_HIDDEN_(bool) IsTopLevelWindowInactive();
/*
* Obtain a native them for rendering our widgets (both form controls and html)
*/
NS_HIDDEN_(nsITheme*) GetTheme();
/*
* Notify the pres context that the theme has changed. An internal switch
* means it's one of our Mozilla themes that changed (e.g., Modern to Classic).
* Otherwise, the OS is telling us that the native theme for the platform
* has changed.
*/
NS_HIDDEN_(void) ThemeChanged();
/*
* Notify the pres context that a system color has changed
*/
NS_HIDDEN_(void) SysColorChanged();
/** Printing methods below should only be used for Medium() == print **/
NS_HIDDEN_(void) SetPrintSettings(nsIPrintSettings *aPrintSettings);
nsIPrintSettings* GetPrintSettings() { return mPrintSettings; }
/* Accessor for table of frame properties */
FramePropertyTable* PropertyTable() { return &mPropertyTable; }
/* Helper function that ensures that this prescontext is shown in its
docshell if it's the most recent prescontext for the docshell. Returns
whether the prescontext is now being shown.
*/
NS_HIDDEN_(bool) EnsureVisible();
#ifdef MOZ_REFLOW_PERF
NS_HIDDEN_(void) CountReflows(const char * aName,
nsIFrame * aFrame);
#endif
/**
* This table maps border-width enums 'thin', 'medium', 'thick'
* to actual nscoord values.
*/
const nscoord* GetBorderWidthTable() { return mBorderWidthTable; }
bool IsDynamic() { return (mType == eContext_PageLayout || mType == eContext_Galley); }
bool IsScreen() { return (mMedium == nsGkAtoms::screen ||
mType == eContext_PageLayout ||
mType == eContext_PrintPreview); }
// Is this presentation in a chrome docshell?
bool IsChrome() const
{
return mIsChromeIsCached ? mIsChrome : IsChromeSlow();
}
virtual void InvalidateIsChromeCacheExternal();
void InvalidateIsChromeCacheInternal() { mIsChromeIsCached = false; }
#ifdef _IMPL_NS_LAYOUT
void InvalidateIsChromeCache()
{ InvalidateIsChromeCacheInternal(); }
#else
void InvalidateIsChromeCache()
{ InvalidateIsChromeCacheExternal(); }
#endif
// Public API for native theme code to get style internals.
virtual bool HasAuthorSpecifiedRules(nsIFrame *aFrame, uint32_t ruleTypeMask) const;
// Is it OK to let the page specify colors and backgrounds?
bool UseDocumentColors() const {
return GetCachedBoolPref(kPresContext_UseDocumentColors) || IsChrome();
}
bool SupressingResizeReflow() const { return mSupressResizeReflow; }
virtual NS_HIDDEN_(gfxUserFontSet*) GetUserFontSetExternal();
NS_HIDDEN_(gfxUserFontSet*) GetUserFontSetInternal();
#ifdef _IMPL_NS_LAYOUT
gfxUserFontSet* GetUserFontSet() { return GetUserFontSetInternal(); }
#else
gfxUserFontSet* GetUserFontSet() { return GetUserFontSetExternal(); }
#endif
void FlushUserFontSet();
void RebuildUserFontSet(); // asynchronously
// Should be called whenever the set of fonts available in the user
// font set changes (e.g., because a new font loads, or because the
// user font set is changed and fonts become unavailable).
void UserFontSetUpdated();
// Ensure that it is safe to hand out CSS rules outside the layout
// engine by ensuring that all CSS style sheets have unique inners
// and, if necessary, synchronously rebuilding all style data.
// Returns true on success and false on failure (not safe).
bool EnsureSafeToHandOutCSSRules();
void NotifyInvalidation(uint32_t aFlags);
void NotifyInvalidation(const nsRect& aRect, uint32_t aFlags);
// aRect is in device pixels
void NotifyInvalidation(const nsIntRect& aRect, uint32_t aFlags);
void NotifyDidPaintForSubtree();
void FireDOMPaintEvent();
// Callback for catching invalidations in ContainerLayers
// Passed to LayerProperties::ComputeDifference
static void NotifySubDocInvalidation(mozilla::layers::ContainerLayer* aContainer,
const nsIntRegion& aRegion);
bool IsDOMPaintEventPending();
void ClearMozAfterPaintEvents() {
mInvalidateRequests.mRequests.Clear();
mAllInvalidated = false;
}
bool IsProcessingRestyles() const {
return mProcessingRestyles;
}
void SetProcessingRestyles(bool aProcessing) {
NS_ASSERTION(aProcessing != bool(mProcessingRestyles),
"should never nest");
mProcessingRestyles = aProcessing;
}
bool IsProcessingAnimationStyleChange() const {
return mProcessingAnimationStyleChange;
}
void SetProcessingAnimationStyleChange(bool aProcessing) {
NS_ASSERTION(aProcessing != bool(mProcessingAnimationStyleChange),
"should never nest");
mProcessingAnimationStyleChange = aProcessing;
}
/**
* Notify the prescontext that the presshell is about to reflow a reflow root.
* The single argument indicates whether this reflow should be interruptible.
* If aInterruptible is false then CheckForInterrupt and HasPendingInterrupt
* will always return false. If aInterruptible is true then CheckForInterrupt
* will return true when a pending event is detected. This is for use by the
* presshell only. Reflow code wanting to prevent interrupts should use
* InterruptPreventer.
*/
void ReflowStarted(bool aInterruptible);
/**
* A class that can be used to temporarily disable reflow interruption.
*/
class InterruptPreventer;
friend class InterruptPreventer;
class NS_STACK_CLASS InterruptPreventer {
public:
InterruptPreventer(nsPresContext* aCtx) :
mCtx(aCtx),
mInterruptsEnabled(aCtx->mInterruptsEnabled),
mHasPendingInterrupt(aCtx->mHasPendingInterrupt)
{
mCtx->mInterruptsEnabled = false;
mCtx->mHasPendingInterrupt = false;
}
~InterruptPreventer() {
mCtx->mInterruptsEnabled = mInterruptsEnabled;
mCtx->mHasPendingInterrupt = mHasPendingInterrupt;
}
private:
nsPresContext* mCtx;
bool mInterruptsEnabled;
bool mHasPendingInterrupt;
};
/**
* Check for interrupts. This may return true if a pending event is
* detected. Once it has returned true, it will keep returning true
* until ReflowStarted is called. In all cases where this returns true,
* the passed-in frame (which should be the frame whose reflow will be
* interrupted if true is returned) will be passed to
* nsIPresShell::FrameNeedsToContinueReflow.
*/
bool CheckForInterrupt(nsIFrame* aFrame);
/**
* Returns true if CheckForInterrupt has returned true since the last
* ReflowStarted call. Cannot itself trigger an interrupt check.
*/
bool HasPendingInterrupt() { return mHasPendingInterrupt; }
/**
* If we have a presshell, and if the given content's current
* document is the same as our presshell's document, return the
* content's primary frame. Otherwise, return null. Only use this
* if you care about which presshell the primary frame is in.
*/
nsIFrame* GetPrimaryFrameFor(nsIContent* aContent);
void NotifyDestroyingFrame(nsIFrame* aFrame)
{
PropertyTable()->DeleteAllFor(aFrame);
}
bool MayHaveFixedBackgroundFrames() { return mMayHaveFixedBackgroundFrames; }
void SetHasFixedBackgroundFrame() { mMayHaveFixedBackgroundFrames = true; }
virtual size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const;
virtual size_t SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
bool IsRootContentDocument();
bool IsCrossProcessRootContentDocument();
bool IsGlyph() const {
return mIsGlyph;
}
void SetIsGlyph(bool aValue) {
mIsGlyph = aValue;
}
protected:
friend class nsRunnableMethod<nsPresContext>;
NS_HIDDEN_(void) ThemeChangedInternal();
NS_HIDDEN_(void) SysColorChangedInternal();
NS_HIDDEN_(void) SetImgAnimations(nsIContent *aParent, uint16_t aMode);
NS_HIDDEN_(void) SetSMILAnimations(nsIDocument *aDoc, uint16_t aNewMode,
uint16_t aOldMode);
NS_HIDDEN_(void) GetDocumentColorPreferences();
NS_HIDDEN_(void) PreferenceChanged(const char* aPrefName);
static NS_HIDDEN_(int) PrefChangedCallback(const char*, void*);
NS_HIDDEN_(void) UpdateAfterPreferencesChanged();
static NS_HIDDEN_(void) PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure);
NS_HIDDEN_(void) GetUserPreferences();
// Allow nsAutoPtr<LangGroupFontPrefs> dtor to access this protected struct's
// dtor:
struct LangGroupFontPrefs;
friend class nsAutoPtr<LangGroupFontPrefs>;
struct LangGroupFontPrefs {
// Font sizes default to zero; they will be set in GetFontPreferences
LangGroupFontPrefs()
: mLangGroup(nullptr)
, mMinimumFontSize(0)
, mDefaultVariableFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultFixedFont("monospace", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL,
NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultSerifFont("serif", NS_FONT_STYLE_NORMAL, NS_FONT_VARIANT_NORMAL,
NS_FONT_WEIGHT_NORMAL, NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultSansSerifFont("sans-serif", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL,
NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultMonospaceFont("monospace", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL,
NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultCursiveFont("cursive", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL,
NS_FONT_STRETCH_NORMAL, 0, 0)
, mDefaultFantasyFont("fantasy", NS_FONT_STYLE_NORMAL,
NS_FONT_VARIANT_NORMAL, NS_FONT_WEIGHT_NORMAL,
NS_FONT_STRETCH_NORMAL, 0, 0)
{}
size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const {
size_t n = 0;
LangGroupFontPrefs *curr = mNext;
while (curr) {
n += aMallocSizeOf(curr);
// Measurement of the following members may be added later if DMD finds
// it is worthwhile:
// - mLangGroup
// - mDefault*Font
curr = curr->mNext;
}
return n;
}
nsCOMPtr<nsIAtom> mLangGroup;
nscoord mMinimumFontSize;
nsFont mDefaultVariableFont;
nsFont mDefaultFixedFont;
nsFont mDefaultSerifFont;
nsFont mDefaultSansSerifFont;
nsFont mDefaultMonospaceFont;
nsFont mDefaultCursiveFont;
nsFont mDefaultFantasyFont;
nsAutoPtr<LangGroupFontPrefs> mNext;
};
/**
* Fetch the user's font preferences for the given aLanguage's
* langugage group.
*/
const LangGroupFontPrefs* GetFontPrefsForLang(nsIAtom *aLanguage) const;
void ResetCachedFontPrefs() {
// Throw away any other LangGroupFontPrefs objects:
mLangGroupFontPrefs.mNext = nullptr;
// Make GetFontPreferences reinitialize mLangGroupFontPrefs:
mLangGroupFontPrefs.mLangGroup = nullptr;
}
NS_HIDDEN_(void) UpdateCharSet(const nsCString& aCharSet);
public:
void DoChangeCharSet(const nsCString& aCharSet);
/**
* Checks for MozAfterPaint listeners on the document
*/
bool MayHavePaintEventListener();
/**
* Checks for MozAfterPaint listeners on the document and
* any subdocuments, except for subdocuments that are non-top-level
* content documents.
*/
bool MayHavePaintEventListenerInSubDocument();
protected:
void InvalidateThebesLayers();
void AppUnitsPerDevPixelChanged();
void HandleRebuildUserFontSet() {
mPostedFlushUserFontSet = false;
FlushUserFontSet();
}
bool HavePendingInputEvent();
// Can't be inline because we can't include nsStyleSet.h.
bool HasCachedStyleData();
bool IsChromeSlow() const;
// IMPORTANT: The ownership implicit in the following member variables
// has been explicitly checked. If you add any members to this class,
// please make the ownership explicit (pinkerton, scc).
nsPresContextType mType;
nsIPresShell* mShell; // [WEAK]
nsCOMPtr<nsIDocument> mDocument;
nsRefPtr<nsDeviceContext> mDeviceContext; // [STRONG] could be weak, but
// better safe than sorry.
// Cannot reintroduce cycles
// since there is no dependency
// from gfx back to layout.
nsRefPtr<nsEventStateManager> mEventManager;
nsRefPtr<nsRefreshDriver> mRefreshDriver;
nsRefPtr<nsTransitionManager> mTransitionManager;
nsRefPtr<nsAnimationManager> mAnimationManager;
nsIAtom* mMedium; // initialized by subclass ctors;
// weak pointer to static atom
nsILinkHandler* mLinkHandler; // [WEAK]
// Formerly mLangGroup; moving from charset-oriented langGroup to
// maintaining actual language settings everywhere (see bug 524107).
// This may in fact hold a langGroup such as x-western rather than
// a specific language, however (e.g, if it is inferred from the
// charset rather than explicitly specified as a lang attribute).
nsCOMPtr<nsIAtom> mLanguage;
public:
// The following are public member variables so that we can use them
// with mozilla::AutoToggle or mozilla::AutoRestore.
// Should we disable font size inflation because we're inside of
// shrink-wrapping calculations on an inflation container?
bool mInflationDisabledForShrinkWrap;
protected:
nsWeakPtr mContainer;
PRCList mDOMMediaQueryLists;
int32_t mMinFontSize; // Min font size, defaults to 0
float mTextZoom; // Text zoom, defaults to 1.0
float mFullZoom; // Page zoom, defaults to 1.0
float mLastFontInflationScreenWidth;
int32_t mCurAppUnitsPerDevPixel;
int32_t mAutoQualityMinFontSizePixelsPref;
nsCOMPtr<nsITheme> mTheme;
nsCOMPtr<nsILanguageAtomService> mLangService;
nsCOMPtr<nsIPrintSettings> mPrintSettings;
nsCOMPtr<nsITimer> mPrefChangedTimer;
FramePropertyTable mPropertyTable;
nsInvalidateRequestList mInvalidateRequests;
// container for per-context fonts (downloadable, SVG, etc.)
nsUserFontSet* mUserFontSet;
nsRect mVisibleArea;
nsSize mPageSize;
float mPageScale;
float mPPScale;
nscolor mDefaultColor;
nscolor mBackgroundColor;
nscolor mLinkColor;
nscolor mActiveLinkColor;
nscolor mVisitedLinkColor;
nscolor mFocusBackgroundColor;
nscolor mFocusTextColor;
nscolor mBodyTextColor;
ScrollbarStyles mViewportStyleOverflow;
uint8_t mFocusRingWidth;
uint16_t mImageAnimationMode;
uint16_t mImageAnimationModePref;
LangGroupFontPrefs mLangGroupFontPrefs;
nscoord mBorderWidthTable[3];
uint32_t mInterruptChecksToSkip;
mozilla::TimeStamp mReflowStartTime;
unsigned mHasPendingInterrupt : 1;
unsigned mInterruptsEnabled : 1;
unsigned mUseDocumentFonts : 1;
unsigned mUseDocumentColors : 1;
unsigned mUnderlineLinks : 1;
unsigned mSendAfterPaintToContent : 1;
unsigned mUseFocusColors : 1;
unsigned mFocusRingOnAnything : 1;
unsigned mFocusRingStyle : 1;
unsigned mDrawImageBackground : 1;
unsigned mDrawColorBackground : 1;
unsigned mNeverAnimate : 1;
unsigned mIsRenderingOnlySelection : 1;
unsigned mPaginated : 1;
unsigned mCanPaginatedScroll : 1;
unsigned mDoScaledTwips : 1;
unsigned mEnableJapaneseTransform : 1;
unsigned mIsRootPaginatedDocument : 1;
unsigned mPrefBidiDirection : 1;
unsigned mPrefScrollbarSide : 2;
unsigned mPendingSysColorChanged : 1;
unsigned mPendingThemeChanged : 1;
unsigned mPendingMediaFeatureValuesChanged : 1;
unsigned mPrefChangePendingNeedsReflow : 1;
unsigned mMayHaveFixedBackgroundFrames : 1;
unsigned mAllInvalidated : 1;
// Are we currently drawing an SVG glyph?
unsigned mIsGlyph : 1;
// Is the current mUserFontSet valid?
unsigned mUserFontSetDirty : 1;
// Has GetUserFontSet() been called?
unsigned mGetUserFontSetCalled : 1;
// Do we currently have an event posted to call FlushUserFontSet?
unsigned mPostedFlushUserFontSet : 1;
// resize reflow is suppressed when the only change has been to zoom
// the document rather than to change the document's dimensions
unsigned mSupressResizeReflow : 1;
unsigned mIsVisual : 1;
unsigned mProcessingRestyles : 1;
unsigned mProcessingAnimationStyleChange : 1;
unsigned mFireAfterPaintEvents : 1;
// Cache whether we are chrome or not because it is expensive.
// mIsChromeIsCached tells us if mIsChrome is valid or we need to get the
// value the slow way.
mutable unsigned mIsChromeIsCached : 1;
mutable unsigned mIsChrome : 1;
#ifdef DEBUG
bool mInitialized;
#endif
protected:
virtual ~nsPresContext() NS_HIDDEN;
// these are private, use the list in nsFont.h if you want a public list
enum {
eDefaultFont_Variable,
eDefaultFont_Fixed,
eDefaultFont_Serif,
eDefaultFont_SansSerif,
eDefaultFont_Monospace,
eDefaultFont_Cursive,
eDefaultFont_Fantasy,
eDefaultFont_COUNT
};
nscolor MakeColorPref(const nsString& aColor);
#ifdef DEBUG
private:
friend struct nsAutoLayoutPhase;
uint32_t mLayoutPhaseCount[eLayoutPhase_COUNT];
public:
uint32_t LayoutPhaseCount(nsLayoutPhase aPhase) {
return mLayoutPhaseCount[aPhase];
}
#endif
};
class nsRootPresContext : public nsPresContext {
public:
nsRootPresContext(nsIDocument* aDocument, nsPresContextType aType) NS_HIDDEN;
virtual ~nsRootPresContext();
/**
* Ensure that NotifyDidPaintForSubtree is eventually called on this
* object after a timeout.
*/
void EnsureEventualDidPaintEvent();
void CancelDidPaintTimer()
{
if (mNotifyDidPaintTimer) {
mNotifyDidPaintTimer->Cancel();
mNotifyDidPaintTimer = nullptr;
}
}
/**
* Registers a plugin to receive geometry updates (position and clip
* region) so it can update its widget.
* Callers must call UnregisterPluginForGeometryUpdates before
* the aPlugin frame is destroyed.
*/
void RegisterPluginForGeometryUpdates(nsIContent* aPlugin);
/**
* Stops a plugin receiving geometry updates (position and clip
* region). If the plugin was not already registered, this does
* nothing.
*/
void UnregisterPluginForGeometryUpdates(nsIContent* aPlugin);
/**
* Iterate through all plugins that are registered for geometry updates
* and update their position and clip region to match the current frame
* tree.
*/
void UpdatePluginGeometry();
/**
* Iterate through all plugins that are registered for geometry updates
* and compute their position and clip region according to the
* current frame tree. Only frames at or under aChangedRoot can have
* changed their geometry. The computed positions and clip regions are
* appended to aConfigurations.
*/
void GetPluginGeometryUpdates(nsIFrame* aChangedRoot,
nsTArray<nsIWidget::Configuration>* aConfigurations);
/**
* When all geometry updates have been applied, call this function
* in case the nsObjectFrames have work to do after the widgets
* have been updated.
*/
void DidApplyPluginGeometryUpdates();
virtual bool IsRoot() MOZ_OVERRIDE { return true; }
/**
* Call this after reflow and scrolling to ensure that the geometry
* of any windowed plugins is updated. aFrame is the root of the
* frame subtree whose geometry has changed.
*/
void RequestUpdatePluginGeometry();
/**
* Increment DOM-modification generation counter to indicate that
* the DOM has changed in a way that might lead to style changes/
* reflows/frame creation and destruction.
*/
void IncrementDOMGeneration() { mDOMGeneration++; }
/**
* Get the current DOM generation counter.
*
* See nsFrameManagerBase::GetGlobalGenerationNumber() for a
* global generation number.
*/
uint32_t GetDOMGeneration() { return mDOMGeneration; }
/**
* Add a runnable that will get called before the next paint. They will get
* run eventually even if painting doesn't happen. They might run well before
* painting happens.
*/
void AddWillPaintObserver(nsIRunnable* aRunnable);
/**
* Run all runnables that need to get called before the next paint.
*/
void FlushWillPaintObservers();
virtual size_t SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const MOZ_OVERRIDE;
protected:
class RunWillPaintObservers : public nsRunnable {
public:
RunWillPaintObservers(nsRootPresContext* aPresContext) : mPresContext(aPresContext) {}
void Revoke() { mPresContext = nullptr; }
NS_IMETHOD Run()
{
if (mPresContext) {
mPresContext->FlushWillPaintObservers();
}
return NS_OK;
}
nsRootPresContext* mPresContext;
};
friend class nsPresContext;
void CancelUpdatePluginGeometryTimer()
{
if (mUpdatePluginGeometryTimer) {
mUpdatePluginGeometryTimer->Cancel();
mUpdatePluginGeometryTimer = nullptr;
}
}
nsCOMPtr<nsITimer> mNotifyDidPaintTimer;
nsCOMPtr<nsITimer> mUpdatePluginGeometryTimer;
nsTHashtable<nsRefPtrHashKey<nsIContent> > mRegisteredPlugins;
// if mNeedsToUpdatePluginGeometry is set, then this is the frame to
// use as the root of the subtree to search for plugin updates, or
// null to use the root frame of this prescontext
nsTArray<nsCOMPtr<nsIRunnable> > mWillPaintObservers;
nsRevocableEventPtr<RunWillPaintObservers> mWillPaintFallbackEvent;
uint32_t mDOMGeneration;
bool mNeedsToUpdatePluginGeometry;
};
#ifdef MOZ_REFLOW_PERF
#define DO_GLOBAL_REFLOW_COUNT(_name) \
aPresContext->CountReflows((_name), (nsIFrame*)this);
#else
#define DO_GLOBAL_REFLOW_COUNT(_name)
#endif // MOZ_REFLOW_PERF
#endif /* nsPresContext_h___ */
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