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gecko/layout/base/nsPresContext.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* a presentation of a document, part 1 */
#ifndef nsPresContext_h___
#define nsPresContext_h___
#include "nsISupports.h"
#include "nsColor.h"
#include "nsCoord.h"
#include "nsAString.h"
#include "nsCOMPtr.h"
#include "nsIPresShell.h"
#include "nsRect.h"
#include "nsIDeviceContext.h"
#include "nsFont.h"
#include "nsIWeakReference.h"
#include "nsITheme.h"
#include "nsILanguageAtomService.h"
#include "nsIObserver.h"
#include "nsITimer.h"
#include "nsCRT.h"
#include "nsIPrintSettings.h"
#include "FramePropertyTable.h"
#include "nsGkAtoms.h"
#include "nsIDocument.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 "nsRegion.h"
#include "nsTArray.h"
#include "nsAutoPtr.h"
#include "nsThreadUtils.h"
#include "nsContentUtils.h"
#include "nsIWidget.h"
#include "mozilla/TimeStamp.h"
#include "nsIContent.h"
class nsImageLoader;
#ifdef IBMBIDI
class nsBidiPresUtils;
#endif // IBMBIDI
struct nsRect;
class imgIRequest;
class nsIFontMetrics;
class nsIFrame;
class nsFrameManager;
class nsILinkHandler;
class nsStyleContext;
class nsIAtom;
class nsIEventStateManager;
class nsIURI;
class nsILookAndFeel;
class nsICSSPseudoComparator;
class nsIAtom;
struct nsStyleBackground;
struct nsStyleBorder;
class nsIRunnable;
class gfxUserFontSet;
class nsUserFontSet;
struct nsFontFaceRuleContainer;
class nsObjectFrame;
class nsTransitionManager;
class nsRefreshDriver;
class imgIContainer;
#ifdef MOZ_REFLOW_PERF
class nsIRenderingContext;
#endif
enum nsWidgetType {
eWidgetType_Button = 1,
eWidgetType_Checkbox = 2,
eWidgetType_Radio = 3,
eWidgetType_Text = 4
};
enum nsLanguageSpecificTransformType {
eLanguageSpecificTransformType_Unknown = -1,
eLanguageSpecificTransformType_None = 0,
eLanguageSpecificTransformType_Japanese
};
// 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_MinimumFontSize = 1,
kPresContext_ScrollbarSide,
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 PRUint8 kPresContext_DefaultVariableFont_ID = 0x00; // kGenericFont_moz_variable
const PRUint8 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;
PRUint32 mFlags;
};
nsTArray<Request> mRequests;
};
/* 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)
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(nsIDeviceContext* 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; }
/**
* Return the presentation context for the root of the view manager
* hierarchy that contains this presentation context, or nsnull if it can't
* be found (e.g. it's detached).
*/
nsRootPresContext* GetRootPresContext();
virtual PRBool IsRoot() { return PR_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; }
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(PRBool aCallerWillRebuildStyleData);
void PostMediaFeatureValuesChangedEvent();
NS_HIDDEN_(void) HandleMediaFeatureValuesChangedEvent();
void FlushPendingMediaFeatureValuesChanged() {
if (mPendingMediaFeatureValuesChanged)
MediaFeatureValuesChanged(PR_FALSE);
}
/**
* Access compatibility mode for this context. This is the same as
* our document's compatibility mode.
*/
nsCompatibility CompatibilityMode() const {
return Document()->GetCompatibilityMode();
}
/**
* Notify the context that the document's compatibility mode has changed
*/
NS_HIDDEN_(void) CompatibilityModeChanged();
/**
* Access the image animation mode for this context
*/
PRUint16 ImageAnimationMode() const { return mImageAnimationMode; }
virtual NS_HIDDEN_(void) SetImageAnimationModeExternal(PRUint16 aMode);
NS_HIDDEN_(void) SetImageAnimationModeInternal(PRUint16 aMode);
#ifdef _IMPL_NS_LAYOUT
void SetImageAnimationMode(PRUint16 aMode)
{ SetImageAnimationModeInternal(aMode); }
#else
void SetImageAnimationMode(PRUint16 aMode)
{ SetImageAnimationModeExternal(aMode); }
#endif
/**
* Get cached look and feel service. This is faster than obtaining it
* through the service manager.
*/
nsILookAndFeel* LookAndFeel() { return mLookAndFeel; }
/**
* Get medium of presentation
*/
nsIAtom* Medium() { return mMedium; }
void* AllocateFromShell(size_t aSize)
{
if (mShell)
return mShell->AllocateMisc(aSize);
return nsnull;
}
void FreeToShell(size_t aSize, void* aFreeChunk)
{
NS_ASSERTION(mShell, "freeing after shutdown");
if (mShell)
mShell->FreeMisc(aSize, aFreeChunk);
}
/**
* Get the font metrics for a given font.
*
* If aUseUserFontSet is false, don't build or use the user font set.
* This is intended only for nsRuleNode::CalcLengthWithInitialFont
* (which is used from media query matching, which is in turn called
* when building the user font set).
*/
NS_HIDDEN_(already_AddRefed<nsIFontMetrics>)
GetMetricsFor(const nsFont& aFont, PRBool aUseUserFontSet = PR_TRUE);
/**
* Get the default font corresponding to the given ID. 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 pres
* context's language group.
*
* For aFontID corresponds to a CSS Generic, the nsFont returned has
* its name as the name or names of the fonts in the user's
* preferences for the given generic and the pres context's language
* group, and its size set to the default variable font size.
*/
NS_HIDDEN_(const nsFont*) GetDefaultFont(PRUint8 aFontID) const;
/** Get a cached boolean pref, by its type */
// * - initially created for bugs 31816, 20760, 22963
PRBool 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 PR_FALSE;
}
/** Get a cached integer pref, by its type */
// * - initially created for bugs 30910, 61883, 74186, 84398
PRInt32 GetCachedIntPref(nsPresContext_CachedIntPrefType aPrefType) const
{
// If called with a constant parameter, the compiler should optimize
// this switch statement away.
switch (aPrefType) {
case kPresContext_MinimumFontSize:
return mMinimumFontSize;
case kPresContext_ScrollbarSide:
return mPrefScrollbarSide;
case kPresContext_BidiDirection:
return mPrefBidiDirection;
default:
NS_ERROR("invalid arg passed to GetCachedIntPref");
}
return PR_FALSE;
}
/**
* Access Nav's magic font scaler value
*/
PRInt32 FontScaler() const { return mFontScaler; }
/**
* 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; }
PRBool GetUseFocusColors() const { return mUseFocusColors; }
PRUint8 FocusRingWidth() const { return mFocusRingWidth; }
PRBool GetFocusRingOnAnything() const { return mFocusRingOnAnything; }
PRUint8 GetFocusRingStyle() const { return mFocusRingStyle; }
/**
* The types of image load types that the pres context needs image
* loaders to track invalidation for.
*/
enum ImageLoadType {
BACKGROUND_IMAGE,
BORDER_IMAGE,
IMAGE_LOAD_TYPE_COUNT
};
/**
* Set the list of image loaders that track invalidation for a
* specific frame and type of image. This list will replace any
* previous list for that frame and image type (and null will remove
* any previous list).
*/
NS_HIDDEN_(void) SetImageLoaders(nsIFrame* aTargetFrame,
ImageLoadType aType,
nsImageLoader* aImageLoaders);
/**
* Make an appropriate SetImageLoaders call (including potentially
* with null aImageLoaders) given that aFrame draws its background
* based on aStyleBackground.
*/
NS_HIDDEN_(void) SetupBackgroundImageLoaders(nsIFrame* aFrame,
const nsStyleBackground*
aStyleBackground);
/**
* Make an appropriate SetImageLoaders call (including potentially
* with null aImageLoaders) given that aFrame draws its border
* based on aStyleBorder.
*/
NS_HIDDEN_(void) SetupBorderImageLoaders(nsIFrame* aFrame,
const nsStyleBorder* aStyleBorder);
/**
* This method is called when a frame is being destroyed to
* ensure that the image loads get disassociated from the prescontext
*/
NS_HIDDEN_(void) StopImagesFor(nsIFrame* aTargetFrame);
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.IsExactEqual(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.
*/
PRBool IsPaginated() const { return mPaginated; }
/**
* Sets whether the presentation context can scroll for a paginated
* context.
*/
NS_HIDDEN_(void) SetPaginatedScrolling(PRBool aResult);
/**
* Return true if this presentation context can scroll for paginated
* context.
*/
PRBool 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
*/
PRBool IsRootPaginatedDocument() { return mIsRootPaginatedDocument; }
void SetIsRootPaginatedDocument(PRBool 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; }
nsIDeviceContext* DeviceContext() { return mDeviceContext; }
nsIEventStateManager* 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(PR_TRUE);
RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
}
}
float GetFullZoom() { return mFullZoom; }
void SetFullZoom(float aZoom);
nscoord GetAutoQualityMinFontSize() {
return DevPixelsToAppUnits(mAutoQualityMinFontSizePixelsPref);
}
static PRInt32 AppUnitsPerCSSPixel() { return nsIDeviceContext::AppUnitsPerCSSPixel(); }
PRInt32 AppUnitsPerDevPixel() const { return mDeviceContext->AppUnitsPerDevPixel(); }
static PRInt32 AppUnitsPerCSSInch() { return nsIDeviceContext::AppUnitsPerCSSInch(); }
static nscoord CSSPixelsToAppUnits(PRInt32 aPixels)
{ return NSIntPixelsToAppUnits(aPixels,
nsIDeviceContext::AppUnitsPerCSSPixel()); }
static nscoord CSSPixelsToAppUnits(float aPixels)
{ return NSFloatPixelsToAppUnits(aPixels,
float(nsIDeviceContext::AppUnitsPerCSSPixel())); }
static PRInt32 AppUnitsToIntCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToIntPixels(aAppUnits,
float(nsIDeviceContext::AppUnitsPerCSSPixel())); }
static float AppUnitsToFloatCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToFloatPixels(aAppUnits,
float(nsIDeviceContext::AppUnitsPerCSSPixel())); }
nscoord DevPixelsToAppUnits(PRInt32 aPixels) const
{ return NSIntPixelsToAppUnits(aPixels,
mDeviceContext->AppUnitsPerDevPixel()); }
PRInt32 AppUnitsToDevPixels(nscoord aAppUnits) const
{ return NSAppUnitsToIntPixels(aAppUnits,
float(mDeviceContext->AppUnitsPerDevPixel())); }
PRInt32 CSSPixelsToDevPixels(PRInt32 aPixels)
{ return AppUnitsToDevPixels(CSSPixelsToAppUnits(aPixels)); }
float CSSPixelsToDevPixels(float aPixels)
{
return NSAppUnitsToFloatPixels(CSSPixelsToAppUnits(aPixels),
float(mDeviceContext->AppUnitsPerDevPixel()));
}
PRInt32 DevPixelsToIntCSSPixels(PRInt32 aPixels)
{ return AppUnitsToIntCSSPixels(DevPixelsToAppUnits(aPixels)); }
float DevPixelsToFloatCSSPixels(PRInt32 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(
nsIDeviceContext::AppUnitsPerCSSInch() * NS_TWIPS_TO_INCHES(aTwips)); }
// Margin-specific version, since they often need TwipsToAppUnits
static nsMargin CSSTwipsToAppUnits(const nsIntMargin &marginInTwips)
{ return nsMargin(CSSTwipsToAppUnits(marginInTwips.left),
CSSTwipsToAppUnits(marginInTwips.top),
CSSTwipsToAppUnits(marginInTwips.right),
CSSTwipsToAppUnits(marginInTwips.bottom)); }
static nscoord CSSPointsToAppUnits(float aPoints)
{ return NSToCoordRound(aPoints * nsIDeviceContext::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.
PRUint8 mHorizontal, mVertical;
ScrollbarStyles(PRUint8 h, PRUint8 v) : mHorizontal(h), mVertical(v) {}
ScrollbarStyles() {}
PRBool operator==(const ScrollbarStyles& aStyles) const {
return aStyles.mHorizontal == mHorizontal && aStyles.mVertical == mVertical;
}
PRBool operator!=(const ScrollbarStyles& aStyles) const {
return aStyles.mHorizontal != mHorizontal || aStyles.mVertical != mVertical;
}
};
void SetViewportOverflowOverride(PRUint8 aX, PRUint8 aY)
{
mViewportStyleOverflow.mHorizontal = aX;
mViewportStyleOverflow.mVertical = aY;
}
ScrollbarStyles GetViewportOverflowOverride()
{
return mViewportStyleOverflow;
}
/**
* Set and get methods for controlling the background drawing
*/
PRBool GetBackgroundImageDraw() const { return mDrawImageBackground; }
void SetBackgroundImageDraw(PRBool aCanDraw)
{
NS_ASSERTION(!(aCanDraw & ~1), "Value must be true or false");
mDrawImageBackground = aCanDraw;
}
PRBool GetBackgroundColorDraw() const { return mDrawColorBackground; }
void SetBackgroundColorDraw(PRBool aCanDraw)
{
NS_ASSERTION(!(aCanDraw & ~1), "Value must be true or false");
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
*/
virtual PRBool BidiEnabledExternal() const { return BidiEnabledInternal(); }
PRBool BidiEnabledInternal() const { return Document()->GetBidiEnabled(); }
#ifdef _IMPL_NS_LAYOUT
PRBool BidiEnabled() const { return BidiEnabledInternal(); }
#else
PRBool BidiEnabled() const { return BidiEnabledExternal(); }
#endif
/**
* 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(PRBool aIsVisual)
{
NS_ASSERTION(!(aIsVisual & ~1), "Value must be true or false");
mIsVisual = aIsVisual;
}
/**
* Check whether the content should be treated as visual.
*
* @lina 05/02/2000
*/
PRBool IsVisualMode() const { return mIsVisual; }
//Mohamed
/**
* Get a Bidi presentation utilities object
*/
NS_HIDDEN_(nsBidiPresUtils*) GetBidiUtils();
/**
* Set the Bidi options for the presentation context
*/
NS_HIDDEN_(void) SetBidi(PRUint32 aBidiOptions,
PRBool aForceRestyle = PR_FALSE);
/**
* Get the Bidi options for the presentation context
* Not inline so consumers of nsPresContext are not forced to
* include nsIDocument.
*/
NS_HIDDEN_(PRUint32) GetBidi() const;
PRUint32 GetBidiMemoryUsed();
#else
PRUint32 GetBidiMemoryUsed() { return 0; }
#endif // IBMBIDI
/**
* Render only Selection
*/
void SetIsRenderingOnlySelection(PRBool aResult)
{
NS_ASSERTION(!(aResult & ~1), "Value must be true or false");
mIsRenderingOnlySelection = aResult;
}
PRBool IsRenderingOnlySelection() const { return mIsRenderingOnlySelection; }
NS_HIDDEN_(PRBool) 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_(PRBool) 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; }
PRBool IsDynamic() { return (mType == eContext_PageLayout || mType == eContext_Galley); }
PRBool IsScreen() { return (mMedium == nsGkAtoms::screen ||
mType == eContext_PageLayout ||
mType == eContext_PrintPreview); }
// Is this presentation in a chrome docshell?
PRBool IsChrome() const
{
return mIsChromeIsCached ? mIsChrome : IsChromeSlow();
}
virtual void InvalidateIsChromeCacheExternal();
void InvalidateIsChromeCacheInternal() { mIsChromeIsCached = PR_FALSE; }
#ifdef _IMPL_NS_LAYOUT
void InvalidateIsChromeCache()
{ InvalidateIsChromeCacheInternal(); }
#else
void InvalidateIsChromeCache()
{ InvalidateIsChromeCacheExternal(); }
#endif
// Public API for native theme code to get style internals.
virtual PRBool HasAuthorSpecifiedRules(nsIFrame *aFrame, PRUint32 ruleTypeMask) const;
// Is it OK to let the page specify colors and backgrounds?
PRBool UseDocumentColors() const {
return GetCachedBoolPref(kPresContext_UseDocumentColors) || IsChrome();
}
PRBool 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).
PRBool EnsureSafeToHandOutCSSRules();
void NotifyInvalidation(const nsRect& aRect, PRUint32 aFlags);
void NotifyInvalidateForScrolling(const nsRegion& aBlitRegion,
const nsRegion& aInvalidateRegion);
void FireDOMPaintEvent();
PRBool IsDOMPaintEventPending() {
return !mInvalidateRequests.mRequests.IsEmpty();
}
void ClearMozAfterPaintEvents() {
mInvalidateRequests.mRequests.Clear();
}
PRBool IsProcessingRestyles() const {
return mProcessingRestyles;
}
void SetProcessingRestyles(PRBool aProcessing) {
NS_ASSERTION(aProcessing != PRBool(mProcessingRestyles),
"should never nest");
mProcessingRestyles = aProcessing;
}
PRBool IsProcessingAnimationStyleChange() const {
return mProcessingAnimationStyleChange;
}
void SetProcessingAnimationStyleChange(PRBool aProcessing) {
NS_ASSERTION(aProcessing != PRBool(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(PRBool 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 = PR_FALSE;
mCtx->mHasPendingInterrupt = PR_FALSE;
}
~InterruptPreventer() {
mCtx->mInterruptsEnabled = mInterruptsEnabled;
mCtx->mHasPendingInterrupt = mHasPendingInterrupt;
}
private:
nsPresContext* mCtx;
PRBool mInterruptsEnabled;
PRBool 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.
*/
PRBool CheckForInterrupt(nsIFrame* aFrame);
/**
* Returns true if CheckForInterrupt has returned true since the last
* ReflowStarted call. Cannot itself trigger an interrupt check.
*/
PRBool 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) {
NS_PRECONDITION(aContent, "Don't do that");
if (GetPresShell() &&
GetPresShell()->GetDocument() == aContent->GetCurrentDoc()) {
return aContent->GetPrimaryFrame();
}
return nsnull;
}
void NotifyDestroyingFrame(nsIFrame* aFrame)
{
PropertyTable()->DeleteAllFor(aFrame);
}
inline void ForgetUpdatePluginGeometryFrame(nsIFrame* aFrame);
void SetContainsUpdatePluginGeometryFrame(PRBool aValue)
{
mContainsUpdatePluginGeometryFrame = aValue;
}
PRBool MayHaveFixedBackgroundFrames() { return mMayHaveFixedBackgroundFrames; }
void SetHasFixedBackgroundFrame() { mMayHaveFixedBackgroundFrames = PR_TRUE; }
PRUint32 EstimateMemoryUsed() {
PRUint32 result = 0;
result += sizeof(nsPresContext);
result += GetBidiMemoryUsed();
return result;
}
protected:
friend class nsRunnableMethod<nsPresContext>;
NS_HIDDEN_(void) ThemeChangedInternal();
NS_HIDDEN_(void) SysColorChangedInternal();
NS_HIDDEN_(void) SetImgAnimations(nsIContent *aParent, PRUint16 aMode);
#ifdef MOZ_SMIL
NS_HIDDEN_(void) SetSMILAnimations(nsIDocument *aDoc, PRUint16 aNewMode,
PRUint16 aOldMode);
#endif // MOZ_SMIL
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();
NS_HIDDEN_(void) GetFontPreferences();
NS_HIDDEN_(void) UpdateCharSet(const nsAFlatCString& aCharSet);
PRBool MayHavePaintEventListener();
void NotifyInvalidateRegion(const nsRegion& aRegion, nsPoint aOffset,
PRUint32 aFlags);
void HandleRebuildUserFontSet() {
mPostedFlushUserFontSet = PR_FALSE;
FlushUserFontSet();
}
PRBool HavePendingInputEvent();
// Can't be inline because we can't include nsStyleSet.h.
PRBool HasCachedStyleData();
PRBool 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;
nsIDeviceContext* mDeviceContext; // [STRONG] could be weak, but
// better safe than sorry.
// Cannot reintroduce cycles
// since there is no dependency
// from gfx back to layout.
nsIEventStateManager* mEventManager; // [STRONG]
nsILookAndFeel* mLookAndFeel; // [STRONG]
nsRefPtr<nsRefreshDriver> mRefreshDriver;
nsRefPtr<nsTransitionManager> mTransitionManager;
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).
nsIAtom* mLanguage; // [STRONG]
nsRefPtrHashtable<nsVoidPtrHashKey, nsImageLoader>
mImageLoaders[IMAGE_LOAD_TYPE_COUNT];
nsWeakPtr mContainer;
float mTextZoom; // Text zoom, defaults to 1.0
float mFullZoom; // Page zoom, defaults to 1.0
PRInt32 mCurAppUnitsPerDevPixel;
PRInt32 mAutoQualityMinFontSizePixelsPref;
#ifdef IBMBIDI
nsBidiPresUtils* mBidiUtils;
#endif
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;
// The list of @font-face rules that we put into mUserFontSet
nsTArray<nsFontFaceRuleContainer> mFontFaceRules;
PRInt32 mFontScaler;
nscoord mMinimumFontSize;
nsRect mVisibleArea;
nsSize mPageSize;
float mPageScale;
float mPPScale;
nscolor mDefaultColor;
nscolor mBackgroundColor;
nscolor mLinkColor;
nscolor mActiveLinkColor;
nscolor mVisitedLinkColor;
nscolor mFocusBackgroundColor;
nscolor mFocusTextColor;
ScrollbarStyles mViewportStyleOverflow;
PRUint8 mFocusRingWidth;
PRUint16 mImageAnimationMode;
PRUint16 mImageAnimationModePref;
nsFont mDefaultVariableFont;
nsFont mDefaultFixedFont;
nsFont mDefaultSerifFont;
nsFont mDefaultSansSerifFont;
nsFont mDefaultMonospaceFont;
nsFont mDefaultCursiveFont;
nsFont mDefaultFantasyFont;
nscoord mBorderWidthTable[3];
PRUint32 mInterruptChecksToSkip;
mozilla::TimeStamp mReflowStartTime;
unsigned mHasPendingInterrupt : 1;
unsigned mInterruptsEnabled : 1;
unsigned mUseDocumentFonts : 1;
unsigned mUseDocumentColors : 1;
unsigned mUnderlineLinks : 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;
// 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 mContainsUpdatePluginGeometryFrame : 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
PRBool 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
};
#ifdef DEBUG
private:
friend struct nsAutoLayoutPhase;
PRUint32 mLayoutPhaseCount[eLayoutPhase_COUNT];
public:
PRUint32 LayoutPhaseCount(nsLayoutPhase aPhase) {
return mLayoutPhaseCount[aPhase];
}
#endif
};
class nsRootPresContext : public nsPresContext {
public:
nsRootPresContext(nsIDocument* aDocument, nsPresContextType aType) NS_HIDDEN;
virtual ~nsRootPresContext();
/**
* 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(nsObjectFrame* aPlugin);
/**
* Stops a plugin receiving geometry updates (position and clip
* region). If the plugin was not already registered, this does
* nothing.
*/
void UnregisterPluginForGeometryUpdates(nsObjectFrame* 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 PRBool IsRoot() { return PR_TRUE; }
/**
* This method is called off an event to force the plugin geometry to
* be updated. First we try to paint, since updating plugin geometry
* during paint is best for keeping plugins in sync with content.
* But we also force geometry updates in case painting doesn't work.
*/
void ForcePluginGeometryUpdate();
/**
* 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(nsIFrame* aFrame);
/**
* Call this when a frame is being destroyed and
* mContainsUpdatePluginGeometryFrame is set in the frame's prescontext.
*/
void RootForgetUpdatePluginGeometryFrame(nsIFrame* aFrame);
private:
nsTHashtable<nsPtrHashKey<nsObjectFrame> > 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
nsIFrame* mUpdatePluginGeometryForFrame;
PRPackedBool mNeedsToUpdatePluginGeometry;
};
inline void
nsPresContext::ForgetUpdatePluginGeometryFrame(nsIFrame* aFrame)
{
if (mContainsUpdatePluginGeometryFrame) {
nsRootPresContext* rootPC = GetRootPresContext();
if (rootPC) {
rootPC->RootForgetUpdatePluginGeometryFrame(aFrame);
}
}
}
#ifdef DEBUG
struct nsAutoLayoutPhase {
nsAutoLayoutPhase(nsPresContext* aPresContext, nsLayoutPhase aPhase)
: mPresContext(aPresContext), mPhase(aPhase), mCount(0)
{
Enter();
}
~nsAutoLayoutPhase()
{
Exit();
NS_ASSERTION(mCount == 0, "imbalanced");
}
void Enter()
{
switch (mPhase) {
case eLayoutPhase_Paint:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"recurring into paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"painting in the middle of reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"painting in the middle of frame construction");
break;
case eLayoutPhase_Reflow:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"reflowing in the middle of a paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"recurring into reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"reflowing in the middle of frame construction");
break;
case eLayoutPhase_FrameC:
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Paint] == 0,
"constructing frames in the middle of a paint");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_Reflow] == 0,
"constructing frames in the middle of reflow");
NS_ASSERTION(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"recurring into frame construction");
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"constructing frames and scripts are not blocked");
break;
default:
break;
}
++(mPresContext->mLayoutPhaseCount[mPhase]);
++mCount;
}
void Exit()
{
NS_ASSERTION(mCount > 0 && mPresContext->mLayoutPhaseCount[mPhase] > 0,
"imbalanced");
--(mPresContext->mLayoutPhaseCount[mPhase]);
--mCount;
}
private:
nsPresContext *mPresContext;
nsLayoutPhase mPhase;
PRUint32 mCount;
};
#define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) \
nsAutoLayoutPhase autoLayoutPhase((pc_), (eLayoutPhase_##phase_))
#define LAYOUT_PHASE_TEMP_EXIT() \
PR_BEGIN_MACRO \
autoLayoutPhase.Exit(); \
PR_END_MACRO
#define LAYOUT_PHASE_TEMP_REENTER() \
PR_BEGIN_MACRO \
autoLayoutPhase.Enter(); \
PR_END_MACRO
#else
#define AUTO_LAYOUT_PHASE_ENTRY_POINT(pc_, phase_) \
PR_BEGIN_MACRO PR_END_MACRO
#define LAYOUT_PHASE_TEMP_EXIT() \
PR_BEGIN_MACRO PR_END_MACRO
#define LAYOUT_PHASE_TEMP_REENTER() \
PR_BEGIN_MACRO PR_END_MACRO
#endif
#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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