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/*
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Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
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Copyright (C) 2001 Dirk Mueller <mueller@kde.org>
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Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA.
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This class provides all functionality needed for loading images, style sheets and html
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pages from the web. It has a memory cache for these objects.
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*/
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#ifndef CachedResourceClient_h
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#define CachedResourceClient_h
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#include <wtf/FastAllocBase.h>
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#if ENABLE(XBL)
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namespace XBL {
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class XBLDocument;
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}
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#endif
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namespace WebCore {
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class CachedCSSStyleSheet;
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class CachedFont;
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class CachedResource;
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class CachedImage;
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class String;
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class Image;
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class IntRect;
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/**
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* @internal
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*
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* a client who wants to load stylesheets, images or scripts from the web has to
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* inherit from this class and overload one of the 3 functions
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*
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*/
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class CachedResourceClient : public FastAllocBase
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{
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public:
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virtual ~CachedResourceClient() { }
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// Called whenever a frame of an image changes, either because we got more data from the network or
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// because we are animating. If not null, the IntRect is the changed rect of the image.
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virtual void imageChanged(CachedImage*, const IntRect* = 0) { };
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// Called to find out if this client wants to actually display the image. Used to tell when we
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// can halt animation. Content nodes that hold image refs for example would not render the image,
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// but RenderImages would (assuming they have visibility: visible and their render tree isn't hidden
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// e.g., in the b/f cache or in a background tab).
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virtual bool willRenderImage(CachedImage*) { return false; }
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virtual void setCSSStyleSheet(const String& /*URL*/, const String& /*charset*/, const CachedCSSStyleSheet*) { }
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virtual void setXSLStyleSheet(const String& /*URL*/, const String& /*sheet*/) { }
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virtual void fontLoaded(CachedFont*) {};
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#if ENABLE(XBL)
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virtual void setXBLDocument(const String& /*URL*/, XBL::XBLDocument*) { }
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#endif
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virtual void notifyFinished(CachedResource*) { }
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};
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}
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#endif
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