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/*
* Copyright (C) 2012 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE COMPUTER, INC. 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 RenderRegionSet_h
#define RenderRegionSet_h
#include "RenderRegion.h"
#include "RenderBoxRegionInfo.h"
namespace WebCore {
class RenderFlowThread;
// RenderRegionSet represents a set of regions that all have the same width and height. It is a "composite region box" that
// can be used to represent a single run of contiguous regions.
//
// By combining runs of same-size columns or pages into a single object, we significantly reduce the number of unique RenderObjects
// required to represent those objects.
//
// This class is abstract and is only intended for use by renderers that generate anonymous runs of identical regions, i.e.,
// columns and printing. RenderMultiColumnSet and RenderPageSet represent runs of columns and pages respectively.
//
// FIXME: For now we derive from RenderRegion, but this may change at some point.
class RenderRegionSet : public RenderRegion {
public:
RenderRegionSet(Element*, RenderFlowThread*);
protected:
virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; }
private:
virtual void installFlowThread() OVERRIDE;
virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE;
virtual const char* renderName() const = 0;
virtual bool isRenderRegionSet() const OVERRIDE { return true; }
};
} // namespace WebCore
#endif // RenderRegionSet_h
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