зеркало из https://github.com/mozilla/gecko-dev.git
338 строки
12 KiB
C++
338 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* rendering object for replaced elements with bitmap image data */
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#ifndef nsImageFrame_h___
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#define nsImageFrame_h___
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#include "nsSplittableFrame.h"
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#include "nsString.h"
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#include "nsAString.h"
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#include "nsPresContext.h"
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#include "nsIImageFrame.h"
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#include "nsIIOService.h"
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#include "nsIObserver.h"
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#include "nsTransform2D.h"
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#include "imgIRequest.h"
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#include "nsStubImageDecoderObserver.h"
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class nsIFrame;
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class nsImageMap;
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class nsIURI;
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class nsILoadGroup;
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struct nsHTMLReflowState;
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struct nsHTMLReflowMetrics;
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struct nsSize;
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class nsDisplayImage;
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class nsImageFrame;
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class nsImageListener : public nsStubImageDecoderObserver
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{
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public:
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nsImageListener(nsImageFrame *aFrame);
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virtual ~nsImageListener();
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NS_DECL_ISUPPORTS
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// imgIDecoderObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
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NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, gfxIImageFrame *aFrame,
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const nsRect *aRect);
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NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status,
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const PRUnichar *statusArg);
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// imgIContainerObserver (override nsStubImageDecoderObserver)
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NS_IMETHOD FrameChanged(imgIContainer *aContainer, gfxIImageFrame *newframe,
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nsRect * dirtyRect);
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void SetFrame(nsImageFrame *frame) { mFrame = frame; }
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private:
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nsImageFrame *mFrame;
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};
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#define IMAGE_SIZECONSTRAINED 0x00100000
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#define IMAGE_GOTINITIALREFLOW 0x00200000
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#define ImageFrameSuper nsSplittableFrame
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class nsImageFrame : public ImageFrameSuper, public nsIImageFrame {
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public:
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nsImageFrame(nsStyleContext* aContext);
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// nsISupports
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NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
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virtual void Destroy();
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NS_IMETHOD Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow);
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NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsRect& aDirtyRect,
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const nsDisplayListSet& aLists);
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virtual nscoord GetMinWidth(nsIRenderingContext *aRenderingContext);
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virtual nscoord GetPrefWidth(nsIRenderingContext *aRenderingContext);
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virtual nsSize GetIntrinsicRatio();
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NS_IMETHOD Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus);
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NS_IMETHOD GetContentForEvent(nsPresContext* aPresContext,
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nsEvent* aEvent,
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nsIContent** aContent);
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NS_IMETHOD HandleEvent(nsPresContext* aPresContext,
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nsGUIEvent* aEvent,
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nsEventStatus* aEventStatus);
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NS_IMETHOD GetCursor(const nsPoint& aPoint,
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nsIFrame::Cursor& aCursor);
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NS_IMETHOD AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType);
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#ifdef ACCESSIBILITY
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NS_IMETHOD GetAccessible(nsIAccessible** aAccessible);
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#endif
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virtual nsIAtom* GetType() const;
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virtual PRBool IsFrameOfType(PRUint32 aFlags) const
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{
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return ImageFrameSuper::IsFrameOfType(aFlags & ~(nsIFrame::eReplaced));
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}
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#ifdef DEBUG
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NS_IMETHOD GetFrameName(nsAString& aResult) const;
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NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
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#endif
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virtual PRIntn GetSkipSides() const;
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NS_IMETHOD GetImageMap(nsPresContext *aPresContext, nsIImageMap **aImageMap);
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NS_IMETHOD GetIntrinsicImageSize(nsSize& aSize);
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static void ReleaseGlobals() {
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if (gIconLoad) {
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gIconLoad->Shutdown();
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NS_RELEASE(gIconLoad);
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}
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NS_IF_RELEASE(sIOService);
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}
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/**
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* Function to test whether aContent, which has aStyleContext as its style,
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* should get an image frame. Note that this method is only used by the
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* frame constructor; it's only here because it uses gIconLoad for now.
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*/
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static PRBool ShouldCreateImageFrameFor(nsIContent* aContent,
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nsStyleContext* aStyleContext);
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void DisplayAltFeedback(nsIRenderingContext& aRenderingContext,
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const nsRect& aDirtyRect,
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imgIRequest* aRequest,
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nsPoint aPt);
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nsRect GetInnerArea() const;
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nsImageMap* GetImageMap(nsPresContext* aPresContext);
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protected:
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// nsISupports
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NS_IMETHOD_(nsrefcnt) AddRef(void);
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NS_IMETHOD_(nsrefcnt) Release(void);
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virtual ~nsImageFrame();
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void EnsureIntrinsicSize(nsPresContext* aPresContext);
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virtual nsSize ComputeSize(nsIRenderingContext *aRenderingContext,
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nsSize aCBSize, nscoord aAvailableWidth,
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nsSize aMargin, nsSize aBorder, nsSize aPadding,
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PRBool aShrinkWrap);
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PRBool IsServerImageMap();
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void TranslateEventCoords(const nsPoint& aPoint,
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nsIntPoint& aResult);
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PRBool GetAnchorHREFTargetAndNode(nsIURI** aHref, nsString& aTarget,
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nsIContent** aNode);
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/**
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* Computes the width of the string that fits into the available space
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*
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* @param in aLength total length of the string in PRUnichars
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* @param in aMaxWidth width not to be exceeded
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* @param out aMaxFit length of the string that fits within aMaxWidth
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* in PRUnichars
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* @return width of the string that fits within aMaxWidth
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*/
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nscoord MeasureString(const PRUnichar* aString,
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PRInt32 aLength,
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nscoord aMaxWidth,
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PRUint32& aMaxFit,
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nsIRenderingContext& aContext);
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void DisplayAltText(nsPresContext* aPresContext,
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nsIRenderingContext& aRenderingContext,
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const nsString& aAltText,
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const nsRect& aRect);
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void PaintImage(nsIRenderingContext& aRenderingContext, nsPoint aPt,
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const nsRect& aDirtyRect, imgIContainer* aImage);
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protected:
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friend class nsImageListener;
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nsresult OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
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nsresult OnDataAvailable(imgIRequest *aRequest,
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gfxIImageFrame *aFrame,
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const nsRect * rect);
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nsresult OnStopDecode(imgIRequest *aRequest,
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nsresult aStatus,
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const PRUnichar *aStatusArg);
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nsresult FrameChanged(imgIContainer *aContainer,
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gfxIImageFrame *aNewframe,
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nsRect *aDirtyRect);
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private:
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// random helpers
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inline void SpecToURI(const nsAString& aSpec, nsIIOService *aIOService,
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nsIURI **aURI);
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inline void GetLoadGroup(nsPresContext *aPresContext,
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nsILoadGroup **aLoadGroup);
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nscoord GetContinuationOffset() const;
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void GetDocumentCharacterSet(nsACString& aCharset) const;
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/**
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* Recalculate mIntrinsicSize from the image.
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*
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* @return whether aImage's size did _not_
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* match our previous intrinsic size
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*/
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PRBool UpdateIntrinsicSize(imgIContainer* aImage);
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/**
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* This function will recalculate mTransform.
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*/
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void RecalculateTransform();
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/**
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* Helper functions to check whether the request or image container
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* corresponds to a load we don't care about. Most of the decoder
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* observer methods will bail early if these return true.
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*/
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PRBool IsPendingLoad(imgIRequest* aRequest) const;
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PRBool IsPendingLoad(imgIContainer* aContainer) const;
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/**
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* Function to convert a dirty rect in the source image to a dirty
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* rect for the image frame.
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*/
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nsRect SourceRectToDest(const nsRect & aRect);
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nsImageMap* mImageMap;
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nsCOMPtr<imgIDecoderObserver> mListener;
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nsSize mComputedSize;
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nsSize mIntrinsicSize;
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nsTransform2D mTransform;
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static nsIIOService* sIOService;
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/* loading / broken image icon support */
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// XXXbz this should be handled by the prescontext, I think; that
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// way we would have a single iconload per mozilla session instead
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// of one per document...
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// LoadIcons: initiate the loading of the static icons used to show
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// loading / broken images
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nsresult LoadIcons(nsPresContext *aPresContext);
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nsresult LoadIcon(const nsAString& aSpec, nsPresContext *aPresContext,
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imgIRequest **aRequest);
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// HandleIconLoads: See if the request is for an Icon load. If it
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// is, handle it and return TRUE otherwise, return FALSE (aCompleted
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// is an input arg telling the routine if the request has completed)
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PRBool HandleIconLoads(imgIRequest* aRequest, PRBool aCompleted);
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class IconLoad : public nsIObserver {
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// private class that wraps the data and logic needed for
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// broken image and loading image icons
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public:
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IconLoad(imgIDecoderObserver* aObserver);
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void Shutdown()
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{
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// in case the pref service releases us later
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if (mLoadingImage) {
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mLoadingImage->Cancel(NS_ERROR_FAILURE);
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mLoadingImage = nsnull;
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}
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if (mBrokenImage) {
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mBrokenImage->Cancel(NS_ERROR_FAILURE);
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mBrokenImage = nsnull;
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}
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}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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private:
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void GetPrefs();
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public:
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nsCOMPtr<imgIRequest> mLoadingImage;
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nsCOMPtr<imgIRequest> mBrokenImage;
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nsCOMPtr<imgIDecoderObserver> mLoadObserver; // keeps the observer alive
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PRUint8 mIconsLoaded;
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PRPackedBool mPrefForceInlineAltText;
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PRPackedBool mPrefShowPlaceholders;
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};
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public:
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static IconLoad* gIconLoad; // singleton pattern: one LoadIcons instance is used
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friend class nsDisplayImage;
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};
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#endif /* nsImageFrame_h___ */
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