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gecko-dev/layout/base/public/nsPresContext.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape 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/NPL/
*
* 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):
*
* Alternatively, the contents of this file may be used under the terms of
* either 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 NPL, 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 NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsIPresContext_h___
#define nsIPresContext_h___
#include "nsISupports.h"
#include "nsColor.h"
#include "nsCoord.h"
#include "nsAString.h"
#include "nsIRequest.h"
#include "nsCompatibility.h"
#include "nsCOMPtr.h"
#include "nsIPresShell.h"
#ifdef IBMBIDI
class nsBidiPresUtils;
#endif // IBMBIDI
struct nsFont;
struct nsRect;
class imgIRequest;
class nsIContent;
class nsIDocument;
class nsIDeviceContext;
class nsIFontMetrics;
class nsIFrame;
class nsIFrameManager;
class nsIImage;
class nsILinkHandler;
class nsIPresShell;
class nsIPref;
class nsStyleContext;
class nsIAtom;
class nsString;
class nsIEventStateManager;
class nsIURI;
class nsILookAndFeel;
class nsICSSPseudoComparator;
class nsILanguageAtom;
class nsITheme;
struct nsStyleStruct;
struct nsStyleBackground;
#ifdef MOZ_REFLOW_PERF
class nsIRenderingContext;
#endif
#define NS_IPRESCONTEXT_IID \
{ 0x0a5d12e0, 0x944e, 0x11d1, \
{0x93, 0x23, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32} }
enum nsWidgetType {
eWidgetType_Button = 1,
eWidgetType_Checkbox = 2,
eWidgetType_Radio = 3,
eWidgetType_Text = 4
};
enum nsLanguageSpecificTransformType {
eLanguageSpecificTransformType_Unknown = -1,
eLanguageSpecificTransformType_None = 0,
eLanguageSpecificTransformType_Japanese,
eLanguageSpecificTransformType_Korean
};
// supported values for cached bool types
const PRUint32 kPresContext_UseDocumentColors = 0x01;
const PRUint32 kPresContext_UseDocumentFonts = 0x02;
const PRUint32 kPresContext_UnderlineLinks = 0x03;
// supported values for cached integer pref types
const PRUint32 kPresContext_MinimumFontSize = 0x01;
// 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
// An interface for presentation contexts. Presentation contexts are
// objects that provide an outer context for a presentation shell.
class nsIPresContext : public nsISupports {
public:
NS_DEFINE_STATIC_IID_ACCESSOR(NS_IPRESCONTEXT_IID)
/**
* Initialize the presentation context from a particular device.
*/
NS_IMETHOD Init(nsIDeviceContext* aDeviceContext) = 0;
/**
* Set the presentation shell that this context is bound to.
* A presentation context may only be bound to a single shell.
*/
NS_IMETHOD SetShell(nsIPresShell* aShell) = 0;
/**
* 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; }
nsIDocument* GetDocument() { return GetPresShell()->GetDocument(); }
nsIViewManager* GetViewManager() { return GetPresShell()->GetViewManager(); }
nsIFrameManager* GetFrameManager()
{ return GetPresShell()->GetFrameManager(); }
/**
* Access compatibility mode for this context
*
* All users must explicitly set the compatibility mode rather than
* relying on a default.
*/
nsCompatibility CompatibilityMode() const { return mCompatibilityMode; }
virtual void SetCompatibilityMode(nsCompatibility aMode) = 0;
/**
* Access the image animation mode for this context
*/
PRUint16 ImageAnimationMode() const { return mImageAnimationMode; }
virtual void SetImageAnimationMode(PRUint16 aMode) = 0;
/**
* Get cached look and feel service. This is faster than obtaining it
* through the service manager.
*/
nsILookAndFeel* LookAndFeel() { return mLookAndFeel; }
/**
* Get base url for presentation
*/
NS_IMETHOD GetBaseURL(nsIURI** aURLResult) = 0;
/**
* Get medium of presentation
*/
NS_IMETHOD GetMedium(nsIAtom** aMediumResult) = 0;
/**
* Clear style data from the root frame downwards, and reflow.
*/
NS_IMETHOD ClearStyleDataAndReflow(void) = 0;
/**
* Resolve style for the given piece of content that will be a child
* of the aParentContext. Don't use this for pseudo frames.
*/
virtual already_AddRefed<nsStyleContext>
ResolveStyleContextFor(nsIContent* aContent,
nsStyleContext* aParentContext) = 0;
/**
* Resolve style for a non-element content node (i.e., one that is
* guaranteed not to match any rules). Eventually such nodes
* shouldn't have style contexts at all, but this at least prevents
* the rule matching.
*
* XXX This is temporary. It should go away when we stop creating
* style contexts for text nodes and placeholder frames. (We also use
* it once to create a style context for the nsFirstLetterFrame that
* represents everything except the first letter.)
*
*/
virtual already_AddRefed<nsStyleContext>
ResolveStyleContextForNonElement(nsStyleContext* aParentContext) = 0;
/**
* Resolve style for a pseudo frame within the given aParentContent & aParentContext.
* The tag should be lowercase and inclue the colon.
* ie: NS_NewAtom(":first-line");
*/
virtual already_AddRefed<nsStyleContext>
ResolvePseudoStyleContextFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext) = 0;
/**
* Resolve style for a pseudo frame within the given aParentContent & aParentContext.
* The tag should be lowercase and inclue the colon.
* ie: NS_NewAtom(":first-line");
*
* Instead of matching solely on aPseudoTag, a comparator function can be
* passed in to test.
*/
virtual already_AddRefed<nsStyleContext>
ResolvePseudoStyleWithComparator(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator) = 0;
/**
* Probe style for a pseudo frame within the given aParentContent & aParentContext.
* This will return nsnull id there are no explicit rules for the pseudo element.
* The tag should be lowercase and inclue the colon.
* ie: NS_NewAtom(":first-line");
*/
virtual already_AddRefed<nsStyleContext>
ProbePseudoStyleContextFor(nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsStyleContext* aParentContext) = 0;
/**
* Resolve a new style context for a content node and return the URL
* for its XBL binding, or null if it has no binding specified in CSS.
*/
NS_IMETHOD GetXBLBindingURL(nsIContent* aContent, nsIURI** aResult) = 0;
/**
* For a given frame tree, get a new style context that is the equivalent
* but within a new parent. The StyleContextParent of aFrame should be
* changed _before_ this method is called, so that style tree verification
* can take place correctly.
*/
NS_IMETHOD ReParentStyleContext(nsIFrame* aFrame,
nsStyleContext* aNewParentContext) = 0;
NS_IMETHOD AllocateFromShell(size_t aSize, void** aResult) = 0;
NS_IMETHOD FreeToShell(size_t aSize, void* aFreeChunk) = 0;
/**
* Get the font metrics for a given font.
*/
NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics** aResult) = 0;
/** Get the default font correponding to the given ID */
NS_IMETHOD GetDefaultFont(PRUint8 aFontID, const nsFont** aResult) = 0;
/** Set the default font correponding to the given ID */
NS_IMETHOD SetDefaultFont(PRUint8 aFontID, const nsFont& aFont) = 0;
/** Get a cached boolean pref, by its type
if the type is not supported, then NS_ERROR_INVALID_ARG is returned
and the aValue argument is undefined, otherwise aValue is set
to the value of the boolean pref */
// * - initially created for bugs 31816, 20760, 22963
NS_IMETHOD GetCachedBoolPref(PRUint32 aPrefType, PRBool& aValue) = 0;
/** Get a cached integer pref, by its type
if the type is not supported, then NS_ERROR_INVALID_ARG is returned
and the aValue argument is undefined, otherwise aValue is set
to the value of the integer pref */
// * - initially created for bugs 30910, 61883, 74186, 84398
NS_IMETHOD GetCachedIntPref(PRUint32 aPrefType, PRInt32& aValue) = 0;
/**
* Access Nav's magic font scaler value
*/
NS_IMETHOD GetFontScaler(PRInt32* aResult) = 0;
NS_IMETHOD SetFontScaler(PRInt32 aScaler) = 0;
/**
* Get the default colors
*/
NS_IMETHOD GetDefaultColor(nscolor* aColor) = 0;
NS_IMETHOD GetDefaultBackgroundColor(nscolor* aColor) = 0;
NS_IMETHOD GetDefaultLinkColor(nscolor* aColor) = 0;
NS_IMETHOD GetDefaultActiveLinkColor(nscolor* aColor) = 0;
NS_IMETHOD GetDefaultVisitedLinkColor(nscolor* aColor) = 0;
NS_IMETHOD GetFocusBackgroundColor(nscolor* aColor) = 0;
NS_IMETHOD GetFocusTextColor(nscolor* aColor) = 0;
NS_IMETHOD GetUseFocusColors(PRBool& useFocusColors) = 0;
NS_IMETHOD GetFocusRingWidth(PRUint8 *focusRingWidth) = 0;
NS_IMETHOD GetFocusRingOnAnything(PRBool& focusRingOnAnything) = 0;
NS_IMETHOD SetDefaultColor(nscolor aColor) = 0;
NS_IMETHOD SetDefaultBackgroundColor(nscolor aColor) = 0;
NS_IMETHOD SetDefaultLinkColor(nscolor aColor) = 0;
NS_IMETHOD SetDefaultActiveLinkColor(nscolor aColor) = 0;
NS_IMETHOD SetDefaultVisitedLinkColor(nscolor aColor) = 0;
/**
* Load an image for the target frame. This call can be made
* repeated with only a single image ever being loaded. When the
* image's data is ready for rendering the target frame's Paint()
* method will be invoked (via the ViewManager) so that the
* appropriate damage repair is done.
*/
NS_IMETHOD LoadImage(nsIURI* aURL,
nsIFrame* aTargetFrame,
imgIRequest **aRequest) = 0;
/**
* This method is called when a frame is being destroyed to
* ensure that the image load gets disassociated from the prescontext
*/
NS_IMETHOD StopImagesFor(nsIFrame* aTargetFrame) = 0;
NS_IMETHOD SetContainer(nsISupports* aContainer) = 0;
NS_IMETHOD GetContainer(nsISupports** aResult) = 0;
// XXX this are going to be replaced with set/get container
NS_IMETHOD SetLinkHandler(nsILinkHandler* aHandler) = 0;
NS_IMETHOD GetLinkHandler(nsILinkHandler** aResult) = 0;
/**
* 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).
*/
NS_IMETHOD GetVisibleArea(nsRect& aResult) = 0;
/**
* Set the currently visible area. The units for r are standard
* nscoord units (as scaled by the device context).
*/
NS_IMETHOD SetVisibleArea(const nsRect& r) = 0;
/**
* Return true if this presentation context is a paginated
* context.
*/
NS_IMETHOD IsPaginated(PRBool* aResult) = 0;
/**
* Sets whether the presentation context can scroll for a paginated
* context.
*/
NS_IMETHOD SetPaginatedScrolling(PRBool aResult) = 0;
/**
* Return true if this presentation context can scroll for paginated
* context.
*/
NS_IMETHOD GetPaginatedScrolling(PRBool* aResult) = 0;
/**
* Gets the rect for the page dimensions,
* this includes X,Y Offsets which are used to determine
* the inclusion of margins
* Also, indicates whether the size has been overridden
*
* @param aActualRect returns the size of the actual device/surface
* @param aRect returns the adjusted size
*/
NS_IMETHOD GetPageDim(nsRect* aActualRect, nsRect* aAdjRect) = 0;
/**
* Sets the "adjusted" rect for the page Dimimensions,
* this includes X,Y Offsets which are used to determine
* the inclusion of margins
*
* @param aRect returns the adjusted size
*/
NS_IMETHOD SetPageDim(nsRect* aRect) = 0;
NS_IMETHOD GetPixelsToTwips(float* aResult) const = 0;
NS_IMETHOD GetTwipsToPixels(float* aResult) const = 0;
NS_IMETHOD GetTwipsToPixelsForFonts(float* aResult) const = 0;
//XXX this is probably not an ideal name. MMP
/**
* Do pixels to twips conversion taking into account
* differing size of a "pixel" from device to device.
*/
NS_IMETHOD GetScaledPixelsToTwips(float* aScale) const = 0;
NS_IMETHOD GetDeviceContext(nsIDeviceContext** aResult) const = 0;
nsIDeviceContext* GetDeviceContext() { return mDeviceContext; }
NS_IMETHOD GetEventStateManager(nsIEventStateManager** aManager) = 0;
nsIEventStateManager* GetEventStateManager();
NS_IMETHOD GetLanguage(nsILanguageAtom** aLanguage) = 0;
/**
* 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
*/
NS_IMETHOD GetLanguageSpecificTransformType(
nsLanguageSpecificTransformType* aType) = 0;
/**
* Set and get methods for controling the background drawing
*/
NS_IMETHOD GetBackgroundImageDraw(PRBool &aCanDraw)=0;
NS_IMETHOD SetBackgroundImageDraw(PRBool aCanDraw)=0;
NS_IMETHOD GetBackgroundColorDraw(PRBool &aCanDraw)=0;
NS_IMETHOD SetBackgroundColorDraw(PRBool aCanDraw)=0;
#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
*/
NS_IMETHOD GetBidiEnabled(PRBool* aBidiEnabled) const = 0;
/**
* Set bidi enabled. This means we should apply the Unicode Bidi Algorithm
*
* @lina 07/12/2000
*/
NS_IMETHOD SetBidiEnabled(PRBool aBidiEnabled) const = 0;
/**
* 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
*/
NS_IMETHOD SetVisualMode(PRBool aIsVisual) = 0;
/**
* Check whether the content should be treated as visual.
*
* @lina 05/02/2000
*/
NS_IMETHOD IsVisualMode(PRBool& aIsVisual) const = 0;
//Mohamed
/**
* Get a Bidi presentation utilities object
*/
NS_IMETHOD GetBidiUtils(nsBidiPresUtils** aBidiUtils) = 0;
/**
* Set the Bidi options for the presentation context
*/
NS_IMETHOD SetBidi(PRUint32 aBidiOptions, PRBool aForceReflow = PR_FALSE) = 0;
/**
* Get the Bidi options for the presentation context
*/
NS_IMETHOD GetBidi(PRUint32* aBidiOptions) const = 0;
//ahmed
/**
* Check for Bidi text mode and direction
* @return aResult == TRUE if the text mode is visual and the direction is right-to-left
*/
NS_IMETHOD IsVisRTL(PRBool &aResult) const = 0;
/**
* Check for Arabic encoding
* @return aResult == TRUE if the document encoding is an Arabic codepage
*/
NS_IMETHOD IsArabicEncoding(PRBool &aResult) const = 0;
/**
* Set the Bidi capabilities of the system
* @param aIsBidi == TRUE if the system has the capability of reordering Bidi text
*/
NS_IMETHOD SetIsBidiSystem(PRBool aIsBidi) = 0;
/**
* Get the Bidi capabilities of the system
* @return aResult == TRUE if the system has the capability of reordering Bidi text
*/
NS_IMETHOD GetIsBidiSystem(PRBool &aResult) const = 0;
/**
* Get the document charset
*/
NS_IMETHOD GetBidiCharset(nsACString &aCharSet) const = 0;
#endif // IBMBIDI
/**
* Render only Selection
*/
NS_IMETHOD SetIsRenderingOnlySelection(PRBool aResult) = 0;
NS_IMETHOD IsRenderingOnlySelection(PRBool* aResult) = 0;
/*
* Obtain a native them for rendering our widgets (both form controls and html)
*/
NS_IMETHOD GetTheme(nsITheme** aResult) = 0;
/*
* 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_IMETHOD ThemeChanged() = 0;
/*
* Notify the pres context that a system color has changed
*/
NS_IMETHOD SysColorChanged() = 0;
/*
* Fill in an nsStyleBackground to be used to paint the background for an
* element. This applies the rules for propagating backgrounds between
* BODY, the root element, and the canvas.
*/
NS_IMETHOD FindFrameBackground(nsIFrame* aFrame,
const nsStyleBackground** aBackground,
PRBool* aIsCanavs,
PRBool* aFoundBackground) = 0;
#ifdef MOZ_REFLOW_PERF
NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame) = 0;
NS_IMETHOD PaintCount(const char * aName, nsIRenderingContext* aRendingContext, nsIFrame * aFrame, PRUint32 aColor) = 0;
#endif
protected:
// 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).
nsIPresShell* mShell; // [WEAK]
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]
nsCompatibility mCompatibilityMode;
PRUint16 mImageAnimationMode;
};
// 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
// Factory method to create a "galley" presentation context (galley is
// a kind of view that has no limit to the size of a page)
nsresult
NS_NewGalleyContext(nsIPresContext** aInstancePtrResult);
#ifdef MOZ_REFLOW_PERF
#define DO_GLOBAL_REFLOW_COUNT(_name, _type) \
aPresContext->CountReflows((_name), (_type), (nsIFrame*)this);
#else
#define DO_GLOBAL_REFLOW_COUNT(_name, _type)
#endif // MOZ_REFLOW_PERF
#if defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF)
#define DO_GLOBAL_REFLOW_COUNT_DSP(_name, _rend) \
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) { \
aPresContext->PaintCount((_name), (_rend), (nsIFrame*)this, 0); \
}
#define DO_GLOBAL_REFLOW_COUNT_DSP_J(_name, _rend, _just) \
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) { \
aPresContext->PaintCount((_name), (_rend), (nsIFrame*)this, (_just)); \
}
#else
#define DO_GLOBAL_REFLOW_COUNT_DSP(_name, _rend)
#define DO_GLOBAL_REFLOW_COUNT_DSP_J(_name, _rend, _just)
#endif // MOZ_REFLOW_PERF_DSP
#endif /* nsIPresContext_h___ */
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