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