1 /* 2 Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de) 3 Copyright (C) 2001 Dirk Mueller <mueller (at) kde.org> 4 Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved. 5 6 This library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Library General Public 8 License as published by the Free Software Foundation; either 9 version 2 of the License, or (at your option) any later version. 10 11 This library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Library General Public License for more details. 15 16 You should have received a copy of the GNU Library General Public License 17 along with this library; see the file COPYING.LIB. If not, write to 18 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 Boston, MA 02110-1301, USA. 20 21 This class provides all functionality needed for loading images, style sheets and html 22 pages from the web. It has a memory cache for these objects. 23 */ 24 25 #ifndef CachedResourceClient_h 26 #define CachedResourceClient_h 27 28 #include <wtf/FastAllocBase.h> 29 #include <wtf/Forward.h> 30 31 namespace WebCore { 32 33 class CachedCSSStyleSheet; 34 class CachedFont; 35 class CachedResource; 36 class CachedImage; 37 class Image; 38 class IntRect; 39 class KURL; 40 41 /** 42 * @internal 43 * 44 * a client who wants to load stylesheets, images or scripts from the web has to 45 * inherit from this class and overload one of the 3 functions 46 * 47 */ 48 class CachedResourceClient { 49 WTF_MAKE_FAST_ALLOCATED; 50 public: 51 virtual ~CachedResourceClient() { } 52 53 // Called whenever a frame of an image changes, either because we got more data from the network or 54 // because we are animating. If not null, the IntRect is the changed rect of the image. 55 virtual void imageChanged(CachedImage*, const IntRect* = 0) { }; 56 57 // Called to find out if this client wants to actually display the image. Used to tell when we 58 // can halt animation. Content nodes that hold image refs for example would not render the image, 59 // but RenderImages would (assuming they have visibility: visible and their render tree isn't hidden 60 // e.g., in the b/f cache or in a background tab). 61 virtual bool willRenderImage(CachedImage*) { return false; } 62 63 virtual void setCSSStyleSheet(const String& /* href */, const KURL& /* baseURL */, const String& /* charset */, const CachedCSSStyleSheet*) { } 64 virtual void setXSLStyleSheet(const String& /* href */, const KURL& /* baseURL */, const String& /* sheet */) { } 65 virtual void fontLoaded(CachedFont*) {}; 66 virtual void notifyFinished(CachedResource*) { } 67 }; 68 69 } 70 71 #endif 72
