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