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71 lines
2.6 KiB
C++
71 lines
2.6 KiB
C++
/*
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* Copyright (C) 2013 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_CORE_RENDERING_SUBTREELAYOUTSCOPE_H_
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#define SKY_ENGINE_CORE_RENDERING_SUBTREELAYOUTSCOPE_H_
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#include "flutter/sky/engine/wtf/HashSet.h"
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// This is the way to mark a subtree as needing layout during layout,
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// e.g. for the purposes of doing a multipass layout.
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//
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// It should only be used during layout. Outside of layout, you should
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// just call renderer->setNeedsLayout() directly.
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//
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// It ensures that you don't accidentally mark part of the tree as
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// needing layout and not actually lay it out.
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namespace blink {
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class RenderObject;
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class SubtreeLayoutScope {
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public:
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SubtreeLayoutScope(RenderObject& root);
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~SubtreeLayoutScope();
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void setNeedsLayout(RenderObject* descendant);
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void setChildNeedsLayout(RenderObject* descendant);
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RenderObject& root() { return m_root; }
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void addRendererToLayout(RenderObject* renderer);
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private:
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RenderObject& m_root;
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#if ENABLE(ASSERT)
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HashSet<RenderObject*> m_renderersToLayout;
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#endif
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};
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}
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#endif // SKY_ENGINE_CORE_RENDERING_SUBTREELAYOUTSCOPE_H_
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