gecko/layout/generic/nsImageFrame.h

348 lines
12 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):
* 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 ***** */
/* rendering object for replaced elements with bitmap image data */
#ifndef nsImageFrame_h___
#define nsImageFrame_h___
#include "nsSplittableFrame.h"
#include "nsString.h"
#include "nsAString.h"
#include "nsIImageFrame.h"
#include "nsIIOService.h"
#include "nsIObserver.h"
#include "nsTransform2D.h"
#include "imgIRequest.h"
#include "nsStubImageDecoderObserver.h"
#include "imgIDecoderObserver.h"
class nsIFrame;
class nsImageMap;
class nsIURI;
class nsILoadGroup;
struct nsHTMLReflowState;
struct nsHTMLReflowMetrics;
struct nsSize;
class nsDisplayImage;
class nsPresContext;
class nsImageFrame;
class nsImageListener : public nsStubImageDecoderObserver
{
public:
nsImageListener(nsImageFrame *aFrame);
virtual ~nsImageListener();
NS_DECL_ISUPPORTS
// imgIDecoderObserver (override nsStubImageDecoderObserver)
NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame,
const nsIntRect *aRect);
NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status,
const PRUnichar *statusArg);
// imgIContainerObserver (override nsStubImageDecoderObserver)
NS_IMETHOD FrameChanged(imgIContainer *aContainer,
const nsIntRect *dirtyRect);
void SetFrame(nsImageFrame *frame) { mFrame = frame; }
private:
nsImageFrame *mFrame;
};
#define IMAGE_SIZECONSTRAINED NS_FRAME_STATE_BIT(20)
#define IMAGE_GOTINITIALREFLOW NS_FRAME_STATE_BIT(21)
#define ImageFrameSuper nsSplittableFrame
class nsImageFrame : public ImageFrameSuper, public nsIImageFrame {
public:
NS_DECL_FRAMEARENA_HELPERS
nsImageFrame(nsStyleContext* aContext);
NS_DECL_QUERYFRAME
virtual void DestroyFrom(nsIFrame* aDestructRoot);
NS_IMETHOD Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
virtual nsSize GetIntrinsicRatio();
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
nsEvent* aEvent,
nsIContent** aContent);
NS_IMETHOD HandleEvent(nsPresContext* aPresContext,
nsGUIEvent* aEvent,
nsEventStatus* aEventStatus);
NS_IMETHOD GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor);
NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType);
#ifdef ACCESSIBILITY
virtual already_AddRefed<nsAccessible> CreateAccessible();
#endif
virtual nsIAtom* GetType() const;
virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
return ImageFrameSuper::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
}
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
#endif
virtual PRIntn GetSkipSides() const;
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);
}
/**
* Function to test whether aContent, which has aStyleContext as its style,
* should get an image frame. Note that this method is only used by the
* frame constructor; it's only here because it uses gIconLoad for now.
*/
static PRBool ShouldCreateImageFrameFor(nsIContent* aContent,
nsStyleContext* aStyleContext);
void DisplayAltFeedback(nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
imgIRequest* aRequest,
nsPoint aPt);
nsRect GetInnerArea() const;
nsImageMap* GetImageMap(nsPresContext* aPresContext);
virtual void AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
protected:
virtual ~nsImageFrame();
void EnsureIntrinsicSize(nsPresContext* aPresContext);
virtual nsSize ComputeSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap);
PRBool IsServerImageMap();
void TranslateEventCoords(const nsPoint& aPoint,
nsIntPoint& aResult);
PRBool GetAnchorHREFTargetAndNode(nsIURI** aHref, nsString& aTarget,
nsIContent** aNode);
/**
* Computes the width of the string that fits into the available space
*
* @param in aLength total length of the string in PRUnichars
* @param in aMaxWidth width not to be exceeded
* @param out aMaxFit length of the string that fits within aMaxWidth
* in PRUnichars
* @return width of the string that fits within aMaxWidth
*/
nscoord 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 PaintImage(nsIRenderingContext& aRenderingContext, nsPoint aPt,
const nsRect& aDirtyRect, imgIContainer* aImage,
PRUint32 aFlags);
protected:
friend class nsImageListener;
nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
nsresult OnDataAvailable(imgIRequest *aRequest, PRBool aCurrentFrame,
const nsIntRect *rect);
nsresult OnStopDecode(imgIRequest *aRequest,
nsresult aStatus,
const PRUnichar *aStatusArg);
nsresult FrameChanged(imgIContainer *aContainer,
const nsIntRect *aDirtyRect);
private:
// random helpers
inline void SpecToURI(const nsAString& aSpec, nsIIOService *aIOService,
nsIURI **aURI);
inline void GetLoadGroup(nsPresContext *aPresContext,
nsILoadGroup **aLoadGroup);
nscoord GetContinuationOffset() const;
void GetDocumentCharacterSet(nsACString& aCharset) const;
/**
* Recalculate mIntrinsicSize from the image.
*
* @return whether aImage's size did _not_
* match our previous intrinsic size
*/
PRBool UpdateIntrinsicSize(imgIContainer* aImage);
/**
* This function will recalculate mTransform.
*/
void RecalculateTransform(PRBool aInnerAreaChanged);
/**
* 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 nsIntRect & aRect);
nsImageMap* mImageMap;
nsCOMPtr<imgIDecoderObserver> mListener;
nsSize mComputedSize;
nsSize mIntrinsicSize;
nsTransform2D mTransform;
PRBool mDisplayingIcon;
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);
class IconLoad : public nsIObserver,
public imgIDecoderObserver {
// private class that wraps the data and logic needed for
// broken image and loading image icons
public:
IconLoad();
void Shutdown()
{
// in case the pref service releases us later
if (mLoadingImage) {
mLoadingImage->CancelAndForgetObserver(NS_ERROR_FAILURE);
mLoadingImage = nsnull;
}
if (mBrokenImage) {
mBrokenImage->CancelAndForgetObserver(NS_ERROR_FAILURE);
mBrokenImage = nsnull;
}
}
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
NS_DECL_IMGICONTAINEROBSERVER
NS_DECL_IMGIDECODEROBSERVER
void AddIconObserver(nsImageFrame *frame) {
NS_ABORT_IF_FALSE(!mIconObservers.Contains(frame),
"Observer shouldn't aleady be in array");
mIconObservers.AppendElement(frame);
}
void RemoveIconObserver(nsImageFrame *frame) {
PRBool rv = mIconObservers.RemoveElement(frame);
NS_ABORT_IF_FALSE(rv, "Observer not in array");
}
private:
void GetPrefs();
nsTObserverArray<nsImageFrame*> mIconObservers;
public:
nsCOMPtr<imgIRequest> mLoadingImage;
nsCOMPtr<imgIRequest> mBrokenImage;
PRPackedBool mPrefForceInlineAltText;
PRPackedBool mPrefShowPlaceholders;
};
public:
static IconLoad* gIconLoad; // singleton pattern: one LoadIcons instance is used
friend class nsDisplayImage;
};
#endif /* nsImageFrame_h___ */