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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 PartialLayoutState_h
#define PartialLayoutState_h
#include "core/rendering/RenderObject.h"
namespace WebCore {
class PartialLayoutState {
friend class PartialLayoutDisabler;
public:
PartialLayoutState()
: m_shouldStop(false)
, m_stopAtRenderer(0)
, m_disableCount(0)
{
}
// True if we plan to do a partial layout, or are in the process of stopping a partial layout.
bool isPartialLayout() const { return m_stopAtRenderer || m_shouldStop; }
bool isStopping() const { return m_shouldStop; }
bool checkPartialLayoutComplete(const RenderObject*);
void setStopAtRenderer(const RenderObject* renderer) { m_stopAtRenderer = renderer; }
void reset() { m_shouldStop = false; m_stopAtRenderer = 0; }
private:
void disable() { ASSERT(!m_shouldStop); m_disableCount++; }
void enable() { ASSERT(m_disableCount > 0); m_disableCount--; }
const RenderObject* stopAtRenderer() const { return m_disableCount > 0 ? 0 : m_stopAtRenderer; }
bool m_shouldStop;
const RenderObject* m_stopAtRenderer;
int m_disableCount;
};
inline bool PartialLayoutState::checkPartialLayoutComplete(const RenderObject* renderer)
{
if (m_shouldStop)
return true;
if (renderer == stopAtRenderer()) {
m_shouldStop = true;
m_stopAtRenderer = 0;
return true;
}
return false;
}
class PartialLayoutDisabler {
WTF_MAKE_NONCOPYABLE(PartialLayoutDisabler);
public:
PartialLayoutDisabler(PartialLayoutState& partialLayout, bool disable = true)
: m_partialLayout(partialLayout)
, m_disable(disable)
{
if (m_disable)
m_partialLayout.disable();
}
~PartialLayoutDisabler()
{
if (m_disable)
m_partialLayout.enable();
}
private:
PartialLayoutState& m_partialLayout;
bool m_disable;
};
} // namespace WebCore
#endif // PartialLayoutState_h
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