StyleSheet.h

00001 /*
00002  * This source file is part of libRocket, the HTML/CSS Interface Middleware
00003  *
00004  * For the latest information, see http://www.librocket.com
00005  *
00006  * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
00007  *
00008  * Permission is hereby granted, free of charge, to any person obtaining a copy
00009  * of this software and associated documentation files (the "Software"), to deal
00010  * in the Software without restriction, including without limitation the rights
00011  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00012  * copies of the Software, and to permit persons to whom the Software is
00013  * furnished to do so, subject to the following conditions:
00014  *
00015  * The above copyright notice and this permission notice shall be included in
00016  * all copies or substantial portions of the Software.
00017  * 
00018  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00019  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00020  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00021  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00022  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00023  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00024  * THE SOFTWARE.
00025  *
00026  */
00027 
00028 #ifndef ROCKETCORESTYLESHEET_H
00029 #define ROCKETCORESTYLESHEET_H
00030 
00031 #include <Rocket/Core/Dictionary.h>
00032 #include <Rocket/Core/ReferenceCountable.h>
00033 #include <set>
00034 #include <Rocket/Core/PropertyDictionary.h>
00035 
00036 namespace Rocket {
00037 namespace Core {
00038 
00039 class Element;
00040 class ElementDefinition;
00041 class StyleSheetNode;
00042 
00050 class StyleSheet : public ReferenceCountable
00051 {
00052 public:
00053         typedef std::set< StyleSheetNode* > NodeList;
00054         typedef std::map< String, NodeList > NodeIndex;
00055 
00056         StyleSheet();
00057         virtual ~StyleSheet();
00058 
00060         bool LoadStyleSheet(Stream* stream);
00061 
00063         StyleSheet* CombineStyleSheet(const StyleSheet* sheet) const;
00065         void BuildNodeIndex();
00066 
00069         ElementDefinition* GetElementDefinition(const Element* element) const;
00070 
00071 protected:
00073         virtual void OnReferenceDeactivate();
00074 
00075 private:
00076         // Root level node, attributes from special nodes like "body" get added to this node
00077         StyleSheetNode* root;
00078 
00079         // The maximum specificity offset used in this style sheet to distinguish between properties in
00080         // similarly-specific rules, but declared on different lines. When style sheets are merged, the
00081         // more-specific style sheet (ie, coming further 'down' the include path) adds the offset of
00082         // the less-specific style sheet onto its offset, thereby ensuring its properties take
00083         // precedence in the event of a conflict.
00084         int specificity_offset;
00085 
00086         // Map of only nodes with actual style information.
00087         NodeIndex styled_node_index;
00088         // Map of every node, even empty, un-styled, nodes.
00089         NodeIndex complete_node_index;
00090 
00091         typedef std::map< String, ElementDefinition* > ElementDefinitionCache;
00092         // Index of element addresses to element definitions.
00093         mutable ElementDefinitionCache address_cache;
00094         // Index of node sets to element definitions.
00095         mutable ElementDefinitionCache node_cache;
00096 };
00097 
00098 }
00099 }
00100 
00101 #endif