128 lines
3.8 KiB
C++
128 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsHTMLImageLoader_h___
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#define nsHTMLImageLoader_h___
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#include "nslayout.h"
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#include "nsString.h"
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#include "nsIPresContext.h"
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class nsIFrame;
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class nsImageMap;
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class nsIImage;
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class nsIURL;
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struct nsHTMLReflowState;
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struct nsHTMLReflowMetrics;
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struct nsSize;
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class nsHTMLImageLoader;
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typedef nsresult (*nsHTMLImageLoaderCB)(nsIPresContext* aPresContext,
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nsHTMLImageLoader* aLoader,
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nsIFrame* aFrame,
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void* aClosure,
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PRUint32 aStatus);
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/**
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* HTML image loader. This is designed to encapsulate the loading
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* and sizing process of html images (basically so that the logic
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* can be reused in the image button form control code and the html
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* image layout code).
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*/
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class nsHTMLImageLoader {
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public:
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nsHTMLImageLoader();
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~nsHTMLImageLoader();
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void Init(nsIFrame* aFrame, nsHTMLImageLoaderCB aCallBack, void* aClosure,
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nsIURL* aBaseURL, const nsString& aURLSpec);
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nsIImage* GetImage();
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void GetURLSpec(nsString& aResult) {
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aResult = mURLSpec;
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}
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void UpdateURLSpec(nsIPresContext* aPresContext,
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const nsString& aNewSpec);
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// Stop the current image load request from loading
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void StopLoadImage(nsIPresContext* aPresContext);
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// Stop all image load requests from loading
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void StopAllLoadImages(nsIPresContext* aPresContext);
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// Get the desired size for the image. If aReflowState is not null
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// then the image will be scaled to fit the reflow
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// constraints. Otherwise, the image will be left at its intrinsic
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// size.
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PRBool GetDesiredSize(nsIPresContext* aPresContext,
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const nsHTMLReflowState* aReflowState,
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nsHTMLReflowMetrics& aDesiredSize);
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PRUint32 GetLoadStatus() const;
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PRBool GetLoadImageFailed() const;
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PRBool IsImageSizeKnown() const {
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return mFlags.mHaveComputedSize;
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}
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protected:
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static nsresult ImageLoadCB(nsIPresContext* aPresContext,
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nsIFrameImageLoader* aLoader,
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nsIFrame* aFrame,
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void* aClosure,
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PRUint32 aStatus);
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void Update(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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PRUint32 aStatus);
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void SetURL(const nsString& aNewSpec);
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nsresult StartLoadImage(nsIPresContext* aPresContext);
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nsIURL* mBaseURL;
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nsIFrame* mFrame;
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nsHTMLImageLoaderCB mCallBack;
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void* mClosure;
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nsString mURLSpec;
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nsString mURL;
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nsIFrameImageLoader* mImageLoader;
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union {
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PRUint32 mAllFlags;
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struct {
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PRUint32 mLoadImageFailed : 1;
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PRUint32 mHaveIntrinsicImageSize : 1;
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PRUint32 mNeedIntrinsicImageSize : 1;
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PRUint32 mAutoImageSize : 1;
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PRUint32 mHaveComputedSize : 1;
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PRUint32 mSquelchCallback : 1;
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PRUint32 mNeedSizeNotification : 1;
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} mFlags;
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};
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nsSize mIntrinsicImageSize;
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nsSize mComputedImageSize;
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};
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#endif /* nsHTMLImageLoader_h___ */
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