gecko-dev/layout/generic/nsImageFrame.h

313 строки
10 KiB
C++

/* -*- 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):
*
* 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 ***** */
#ifndef nsImageFrame_h___
#define nsImageFrame_h___
#include "nsSplittableFrame.h"
#include "nsString.h"
#include "nsAString.h"
#include "nsPresContext.h"
#include "nsIImageFrame.h"
#include "nsIIOService.h"
#include "nsIObserver.h"
#include "nsTransform2D.h"
#include "imgIRequest.h"
#include "imgIDecoderObserver.h"
#include "imgIContainerObserver.h"
class nsIFrame;
class nsImageMap;
class nsIURI;
class nsILoadGroup;
struct nsHTMLReflowState;
struct nsHTMLReflowMetrics;
struct nsSize;
class nsImageFrame;
class nsImageListener : public imgIDecoderObserver
{
public:
nsImageListener(nsImageFrame *aFrame);
virtual ~nsImageListener();
NS_DECL_ISUPPORTS
NS_DECL_IMGIDECODEROBSERVER
NS_DECL_IMGICONTAINEROBSERVER
void SetFrame(nsImageFrame *frame) { mFrame = frame; }
private:
nsImageFrame *mFrame;
};
#define IMAGE_SIZECONSTRAINED 0x00100000
#define IMAGE_GOTINITIALREFLOW 0x00200000
#define ImageFrameSuper nsSplittableFrame
class nsImageFrame : public ImageFrameSuper, public nsIImageFrame {
public:
nsImageFrame();
// nsISupports
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
NS_IMETHOD Destroy(nsPresContext* aPresContext);
NS_IMETHOD Init(nsPresContext* aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsStyleContext* aContext,
nsIFrame* aPrevInFlow);
NS_IMETHOD Paint(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer,
PRUint32 aFlags = 0);
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD CanContinueTextRun(PRBool& aContinueTextRun) const;
NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent);
NS_IMETHOD HandleEvent(nsPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus);
NS_IMETHOD GetCursor(nsPresContext* aPresContext,
nsPoint& aPoint,
PRInt32& aCursor);
NS_IMETHOD AttributeChanged(nsPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
#ifdef ACCESSIBILITY
NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
#endif
virtual nsIAtom* GetType() const;
#ifdef DEBUG
NS_IMETHOD List(nsPresContext* aPresContext, FILE* out, PRInt32 aIndent) const;
#endif
NS_IMETHOD GetImageMap(nsPresContext *aPresContext, nsIImageMap **aImageMap);
NS_IMETHOD GetIntrinsicImageSize(nsSize& aSize);
static void ReleaseGlobals() {
if (gIconLoad) {
gIconLoad->Shutdown();
NS_RELEASE(gIconLoad);
}
NS_IF_RELEASE(sIOService);
}
protected:
// nsISupports
NS_IMETHOD_(nsrefcnt) AddRef(void);
NS_IMETHOD_(nsrefcnt) Release(void);
virtual ~nsImageFrame();
virtual void GetDesiredSize(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aDesiredSize);
nsImageMap* GetImageMap(nsPresContext* aPresContext);
void TriggerLink(nsPresContext* aPresContext,
nsIURI* aURI,
const nsString& aTargetSpec,
PRBool aClick);
PRBool IsServerImageMap();
void TranslateEventCoords(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsPoint& aResult);
PRBool GetAnchorHREFAndTarget(nsIURI** aHref, nsString& aTarget);
void MeasureString(const PRUnichar* aString,
PRInt32 aLength,
nscoord aMaxWidth,
PRUint32& aMaxFit,
nsIRenderingContext& aContext);
void DisplayAltText(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect);
void DisplayAltFeedback(nsPresContext* aPresContext,
nsIRenderingContext& aRenderingContext,
imgIRequest* aRequest);
void GetInnerArea(nsPresContext* aPresContext,
nsRect& aInnerArea) const;
protected:
friend class nsImageListener;
nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
nsresult OnDataAvailable(imgIRequest *aRequest,
gfxIImageFrame *aFrame,
const nsRect * rect);
nsresult OnStopDecode(imgIRequest *aRequest,
nsresult aStatus,
const PRUnichar *aStatusArg);
nsresult FrameChanged(imgIContainer *aContainer,
gfxIImageFrame *aNewframe,
nsRect *aDirtyRect);
private:
// random helpers
inline void SpecToURI(const nsAString& aSpec, nsIIOService *aIOService,
nsIURI **aURI);
inline void GetLoadGroup(nsPresContext *aPresContext,
nsILoadGroup **aLoadGroup);
nscoord GetContinuationOffset(nscoord* aWidth = 0) const;
void GetDocumentCharacterSet(nsACString& aCharset) const;
/**
* This function will recalculate mTransform. If a non-null image
* is passed in, mIntrinsicSize will be recalculated from the image
* size. Otherwise, mIntrinsicSize will not be touched.
*
* @return PR_TRUE if aImage is non-null and its size did _not_
* match our previous intrinsic size
* @return PR_FALSE otherwise
*/
PRBool RecalculateTransform(imgIContainer* aImage);
/**
* Helper functions to check whether the request or image container
* corresponds to a load we don't care about. Most of the decoder
* observer methods will bail early if these return true.
*/
PRBool IsPendingLoad(imgIRequest* aRequest) const;
PRBool IsPendingLoad(imgIContainer* aContainer) const;
/**
* Function to convert a dirty rect in the source image to a dirty
* rect for the image frame.
*/
nsRect SourceRectToDest(const nsRect & aRect);
/**
* Function to call when a load fails; this handles things like alt
* text, broken image icons, etc. Returns NS_ERROR_FRAME_REPLACED
* if it called CantRenderReplacedElement, NS_OK otherwise.
*/
nsresult HandleLoadError(nsresult aStatus, nsIPresShell* aPresShell);
nsImageMap* mImageMap;
nsCOMPtr<imgIDecoderObserver> mListener;
nsSize mComputedSize;
nsSize mIntrinsicSize;
nsTransform2D mTransform;
nsMargin mBorderPadding;
static nsIIOService* sIOService;
/* loading / broken image icon support */
// XXXbz this should be handled by the prescontext, I think; that
// way we would have a single iconload per mozilla session instead
// of one per document...
// LoadIcons: initiate the loading of the static icons used to show
// loading / broken images
nsresult LoadIcons(nsPresContext *aPresContext);
nsresult LoadIcon(const nsAString& aSpec, nsPresContext *aPresContext,
imgIRequest **aRequest);
// HandleIconLoads: See if the request is for an Icon load. If it
// is, handle it and return TRUE otherwise, return FALSE (aCompleted
// is an input arg telling the routine if the request has completed)
PRBool HandleIconLoads(imgIRequest* aRequest, PRBool aCompleted);
void InvalidateIcon();
class IconLoad : public nsIObserver {
// private class that wraps the data and logic needed for
// broken image and loading image icons
public:
IconLoad(imgIDecoderObserver* aObserver);
void Shutdown()
{
// in case the pref service releases us later
if (mLoadingImage) {
mLoadingImage->Cancel(NS_ERROR_FAILURE);
mLoadingImage = nsnull;
}
if (mBrokenImage) {
mBrokenImage->Cancel(NS_ERROR_FAILURE);
mBrokenImage = nsnull;
}
}
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
private:
void GetPrefs();
public:
nsCOMPtr<imgIRequest> mLoadingImage;
nsCOMPtr<imgIRequest> mBrokenImage;
nsCOMPtr<imgIDecoderObserver> mLoadObserver; // keeps the observer alive
PRUint8 mIconsLoaded;
PRPackedBool mPrefForceInlineAltText;
PRPackedBool mPrefAllImagesBlocked;
PRPackedBool mPrefShowPlaceholders;
};
static IconLoad* gIconLoad; // singleton pattern: one LoadIcons instance is used
};
#endif /* nsImageFrame_h___ */