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/*
* This source file is part of libRocket, the HTML/CSS Interface Middleware
*
* For the latest information, see http://www.librocket.com
*
* Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#ifndef ROCKETCORESTYLESHEET_H
#define ROCKETCORESTYLESHEET_H
#include "Dictionary.h"
#include "ReferenceCountable.h"
#include <set>
#include "PropertyDictionary.h"
namespace Rocket {
namespace Core {
class Element;
class ElementDefinition;
class StyleSheetNode;
/**
StyleSheet maintains a single stylesheet definition. A stylesheet can be combined with another stylesheet to create
a new, merged stylesheet.
@author Lloyd Weehuizen
*/
class ROCKETCORE_API StyleSheet : public ReferenceCountable
{
public:
typedef std::set< StyleSheetNode* > NodeList;
typedef std::map< String, NodeList > NodeIndex;
StyleSheet();
virtual ~StyleSheet();
/// Loads a style from a CSS definition.
bool LoadStyleSheet(Stream* stream);
/// Combines this style sheet with another one, producing a new sheet.
StyleSheet* CombineStyleSheet(const StyleSheet* sheet) const;
/// Builds the node index for a combined style sheet.
void BuildNodeIndex();
/// Returns the compiled element definition for a given element hierarchy. A reference count will be added for the
/// caller, so another should not be added. The definition should be released by removing the reference count.
ElementDefinition* GetElementDefinition(const Element* element) const;
protected:
/// Destroys the style sheet.
virtual void OnReferenceDeactivate();
private:
// Root level node, attributes from special nodes like "body" get added to this node
StyleSheetNode* root;
// The maximum specificity offset used in this style sheet to distinguish between properties in
// similarly-specific rules, but declared on different lines. When style sheets are merged, the
// more-specific style sheet (ie, coming further 'down' the include path) adds the offset of
// the less-specific style sheet onto its offset, thereby ensuring its properties take
// precedence in the event of a conflict.
int specificity_offset;
// Map of only nodes with actual style information.
NodeIndex styled_node_index;
// Map of every node, even empty, un-styled, nodes.
NodeIndex complete_node_index;
typedef std::map< String, ElementDefinition* > ElementDefinitionCache;
// Index of element addresses to element definitions.
mutable ElementDefinitionCache address_cache;
// Index of node sets to element definitions.
mutable ElementDefinitionCache node_cache;
};
}
}
#endif
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