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50483b22f4
gecko/layout/base/nsPresContext.h
Robert O'Callahan 6a45b282aa Backing out bug 448830
2008-09-26 13:10:26 +12:00

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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 "nsPropertyTable.h"
#include "nsGkAtoms.h"
#include "nsIDocument.h"
#include "nsInterfaceHashtable.h"
#include "nsCycleCollectionParticipant.h"
#include "nsChangeHint.h"
// This also pulls in gfxTypes.h, which we cannot include directly.
#include "gfxRect.h"
#include "nsRegion.h"
class nsImageLoader;
#ifdef IBMBIDI
class nsBidiPresUtils;
#endif // IBMBIDI
struct nsRect;
class imgIRequest;
class nsIContent;
class nsIFontMetrics;
class nsIFrame;
class nsFrameManager;
class nsIImage;
class nsILinkHandler;
class nsStyleContext;
class nsIAtom;
class nsIEventStateManager;
class nsIURI;
class nsILookAndFeel;
class nsICSSPseudoComparator;
class nsIAtom;
struct nsStyleBackground;
template <class T> class nsRunnableMethod;
class nsIRunnable;
#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
/* 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)
// An interface for presentation contexts. Presentation contexts are
// objects that provide an outer context for a presentation shell.
class nsPresContext : public nsIObserver {
public:
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; }
// Find the prescontext for the root of the view manager hierarchy that contains
// this prescontext.
nsPresContext* RootPresContext();
nsIDocument* Document() const
{
NS_ASSERTION(!mShell || !mShell->GetDocument() ||
mShell->GetDocument() == mDocument,
"nsPresContext doesn't have the same document as nsPresShell!");
return mDocument;
}
nsIViewManager* GetViewManager() { return GetPresShell()->GetViewManager(); }
#ifdef _IMPL_NS_LAYOUT
nsStyleSet* StyleSet() { return GetPresShell()->StyleSet(); }
nsFrameManager* FrameManager()
{ return GetPresShell()->FrameManager(); }
#endif
void RebuildAllStyleData(nsChangeHint aExtraHint);
void PostRebuildAllStyleDataEvent();
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; }
void RestoreImageAnimationMode() { SetImageAnimationMode(mImageAnimationModePref); }
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->AllocateFrame(aSize);
return nsnull;
}
void FreeToShell(size_t aSize, void* aFreeChunk)
{
if (mShell)
mShell->FreeFrame(aSize, aFreeChunk);
}
/**
* Get the font metrics for a given font.
*/
virtual NS_HIDDEN_(already_AddRefed<nsIFontMetrics>)
GetMetricsForExternal(const nsFont& aFont);
NS_HIDDEN_(already_AddRefed<nsIFontMetrics>)
GetMetricsForInternal(const nsFont& aFont);
#ifdef _IMPL_NS_LAYOUT
already_AddRefed<nsIFontMetrics> GetMetricsFor(const nsFont& aFont)
{ return GetMetricsForInternal(aFont); }
#else
already_AddRefed<nsIFontMetrics> GetMetricsFor(const nsFont& aFont)
{ return GetMetricsForExternal(aFont); }
#endif
/**
* 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.
*/
virtual NS_HIDDEN_(const nsFont*) GetDefaultFontExternal(PRUint8 aFontID) const;
NS_HIDDEN_(const nsFont*) GetDefaultFontInternal(PRUint8 aFontID) const;
#ifdef _IMPL_NS_LAYOUT
const nsFont* GetDefaultFont(PRUint8 aFontID) const
{ return GetDefaultFontInternal(aFontID); }
#else
const nsFont* GetDefaultFont(PRUint8 aFontID) const
{ return GetDefaultFontExternal(aFontID); }
#endif
/** 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; }
/**
* Set up observers so that aTargetFrame will be invalidated when
* aImage loads, where aImage is its background image. Only a single
* image will be tracked per frame.
*/
NS_HIDDEN_(imgIRequest*) LoadImage(imgIRequest* aImage,
nsIFrame* aTargetFrame);
/**
* Set up observers so that aTargetFrame will be invalidated or
* reflowed (as appropriate) when aImage loads, where aImage is its
* *border* image. Only a single image will be tracked per frame.
*/
NS_HIDDEN_(imgIRequest*) LoadBorderImage(imgIRequest* aImage,
nsIFrame* aTargetFrame);
private:
typedef nsInterfaceHashtable<nsVoidPtrHashKey, nsImageLoader> ImageLoaderTable;
NS_HIDDEN_(imgIRequest*) DoLoadImage(ImageLoaderTable& aTable,
imgIRequest* aImage,
nsIFrame* aTargetFrame,
PRBool aReflowOnLoad);
NS_HIDDEN_(void) DoStopImageFor(ImageLoaderTable& aTable,
nsIFrame* aTargetFrame);
public:
NS_HIDDEN_(void) StopBackgroundImageFor(nsIFrame* aTargetFrame)
{ DoStopImageFor(mImageLoaders, aTargetFrame); }
NS_HIDDEN_(void) StopBorderImageFor(nsIFrame* aTargetFrame)
{ DoStopImageFor(mBorderImageLoaders, aTargetFrame); }
/**
* This method is called when a frame is being destroyed to
* ensure that the image load gets 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 visiable 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) {
mVisibleArea = r;
PostMediaFeatureValuesChangedEvent();
}
/**
* Return true if this presentation context is a paginated
* context.
*/
PRBool IsPaginated() const { return mPaginated; }
PRBool GetRenderedPositionVaryingContent() const { return mRenderedPositionVaryingContent; }
void SetRenderedPositionVaryingContent() { mRenderedPositionVaryingContent = PR_TRUE; }
/**
* 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* GetLangGroup() { return mLangGroup; }
float TextZoom() { return mTextZoom; }
void SetTextZoom(float aZoom) {
mTextZoom = aZoom;
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(); }
PRInt32 AppUnitsPerInch() const { return mDeviceContext->AppUnitsPerInch(); }
static nscoord CSSPixelsToAppUnits(PRInt32 aPixels)
{ return NSIntPixelsToAppUnits(aPixels,
nsIDeviceContext::AppUnitsPerCSSPixel()); }
static nscoord CSSPixelsToAppUnits(float aPixels)
{ return NSFloatPixelsToAppUnits(aPixels,
nsIDeviceContext::AppUnitsPerCSSPixel()); }
static PRInt32 AppUnitsToIntCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToIntPixels(aAppUnits,
nsIDeviceContext::AppUnitsPerCSSPixel()); }
static float AppUnitsToFloatCSSPixels(nscoord aAppUnits)
{ return NSAppUnitsToFloatPixels(aAppUnits,
nsIDeviceContext::AppUnitsPerCSSPixel()); }
static gfxFloat AppUnitsToGfxCSSPixels(nscoord aAppUnits)
{ return nsIDeviceContext::AppUnitsToGfxCSSPixels(aAppUnits); }
nscoord DevPixelsToAppUnits(PRInt32 aPixels) const
{ return NSIntPixelsToAppUnits(aPixels,
mDeviceContext->AppUnitsPerDevPixel()); }
PRInt32 AppUnitsToDevPixels(nscoord aAppUnits) const
{ return NSAppUnitsToIntPixels(aAppUnits,
mDeviceContext->AppUnitsPerDevPixel()); }
// 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)); }
nscoord TwipsToAppUnits(PRInt32 aTwips) const
{ return NSToCoordRound(NS_TWIPS_TO_INCHES(aTwips) *
mDeviceContext->AppUnitsPerInch()); }
// Margin-specific version, since they often need TwipsToAppUnits
nsMargin TwipsToAppUnits(const nsMargin &marginInTwips) const
{ return nsMargin(TwipsToAppUnits(marginInTwips.left),
TwipsToAppUnits(marginInTwips.top),
TwipsToAppUnits(marginInTwips.right),
TwipsToAppUnits(marginInTwips.bottom)); }
PRInt32 AppUnitsToTwips(nscoord aTwips) const
{ return NS_INCHES_TO_TWIPS((float)aTwips /
mDeviceContext->AppUnitsPerInch()); }
nscoord PointsToAppUnits(float aPoints) const
{ return NSToCoordRound(aPoints * mDeviceContext->AppUnitsPerInch() /
POINTS_PER_INCH_FLOAT); }
float AppUnitsToPoints(nscoord aAppUnits) const
{ return (float)aAppUnits / mDeviceContext->AppUnitsPerInch() *
POINTS_PER_INCH_FLOAT; }
nscoord RoundAppUnitsToNearestDevPixels(nscoord aAppUnits) const
{ return DevPixelsToAppUnits(AppUnitsToDevPixels(aAppUnits)); }
/**
* Get the language-specific transform type for the current document.
* This tells us whether we need to perform special language-dependent
* transformations such as Unicode U+005C (backslash) to Japanese
* Yen Sign (Unicode U+00A5, JIS 0x5C).
*
* @param aType returns type, must be non-NULL
*/
nsLanguageSpecificTransformType LanguageSpecificTransformType() const
{
return mLanguageSpecificTransformType;
}
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() {}
};
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 NS_HIDDEN_(PRBool) BidiEnabledExternal() const;
NS_HIDDEN_(PRBool) BidiEnabledInternal() const;
#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;
#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; }
/*
* 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 */
nsPropertyTable* 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.
@param aUnsuppressFocus If this is false, then focus will not be
unsuppressed when PR_TRUE is returned. It's the caller's responsibility
to unsuppress focus in that case.
*/
NS_HIDDEN_(PRBool) EnsureVisible(PRBool aUnsuppressFocus);
#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;
// 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; }
void NotifyInvalidation(const nsRect& aRect, PRBool aIsCrossDoc);
void FireDOMPaintEvent();
protected:
friend class nsRunnableMethod<nsPresContext>;
NS_HIDDEN_(void) ThemeChangedInternal();
NS_HIDDEN_(void) SysColorChangedInternal();
NS_HIDDEN_(void) SetImgAnimations(nsIContent *aParent, PRUint16 aMode);
NS_HIDDEN_(void) GetDocumentColorPreferences();
NS_HIDDEN_(void) PreferenceChanged(const char* aPrefName);
static NS_HIDDEN_(int) PR_CALLBACK PrefChangedCallback(const char*, void*);
NS_HIDDEN_(void) UpdateAfterPreferencesChanged();
static NS_HIDDEN_(void) PR_CALLBACK PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure);
NS_HIDDEN_(void) GetUserPreferences();
NS_HIDDEN_(void) GetFontPreferences();
NS_HIDDEN_(void) UpdateCharSet(const nsAFlatCString& aCharSet);
// 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]
nsIAtom* mMedium; // initialized by subclass ctors;
// weak pointer to static atom
nsILinkHandler* mLinkHandler; // [WEAK]
nsIAtom* mLangGroup; // [STRONG]
ImageLoaderTable mImageLoaders;
ImageLoaderTable mBorderImageLoaders;
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;
nsPropertyTable mPropertyTable;
nsRegion mSameDocDirtyRegion;
nsRegion mCrossDocDirtyRegion;
nsLanguageSpecificTransformType mLanguageSpecificTransformType;
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];
unsigned mUseDocumentFonts : 1;
unsigned mUseDocumentColors : 1;
unsigned mUnderlineLinks : 1;
unsigned mUseFocusColors : 1;
unsigned mFocusRingOnAnything : 1;
unsigned mDrawImageBackground : 1;
unsigned mDrawColorBackground : 1;
unsigned mNeverAnimate : 1;
unsigned mIsRenderingOnlySelection : 1;
unsigned mNoTheme : 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 mRenderedPositionVaryingContent : 1;
// resize reflow is supressed when the only change has been to zoom
// the document rather than to change the document's dimensions
unsigned mSupressResizeReflow : 1;
#ifdef IBMBIDI
unsigned mIsVisual : 1;
#endif
#ifdef DEBUG
PRBool mInitialized;
#endif
protected:
~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
};
// Bit values for StartLoadImage's aImageStatus
#define NS_LOAD_IMAGE_STATUS_ERROR 0x1
#define NS_LOAD_IMAGE_STATUS_SIZE 0x2
#define NS_LOAD_IMAGE_STATUS_BITS 0x4
#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");
// The nsXBLService::LoadBindings call in ConstructFrameInternal
// makes us hit this one too often to be an NS_ASSERTION,
// despite how scary it is.
NS_WARN_IF_FALSE(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
"recurring into frame construction");
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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