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/*
* Copyright 2014 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef COBALT_RENDER_TREE_NODE_VISITOR_H_
#define COBALT_RENDER_TREE_NODE_VISITOR_H_
namespace cobalt {
namespace render_tree {
class CompositionNode;
class FilterNode;
class ImageNode;
class MatrixTransformNode;
class PunchThroughVideoNode;
class RectNode;
class RectShadowNode;
class TextNode;
namespace animations {
class AnimateNode;
} // namespace animations
// Type-safe branching on a class hierarchy of render tree nodes,
// implemented after a classical GoF pattern (see
// http://en.wikipedia.org/wiki/Visitor_pattern#Java_example).
class NodeVisitor {
public:
virtual void Visit(animations::AnimateNode* animate) = 0;
virtual void Visit(CompositionNode* composition) = 0;
virtual void Visit(FilterNode* text) = 0;
virtual void Visit(ImageNode* image) = 0;
virtual void Visit(MatrixTransformNode* transform) = 0;
virtual void Visit(PunchThroughVideoNode* punch_through) = 0;
virtual void Visit(RectNode* rect) = 0;
virtual void Visit(RectShadowNode* rect) = 0;
virtual void Visit(TextNode* text) = 0;
protected:
~NodeVisitor() {}
};
} // namespace render_tree
} // namespace cobalt
#endif // COBALT_RENDER_TREE_NODE_VISITOR_H_