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/*
* Copyright (C) 2011 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER "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 HOLDER 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.
*/
#include "config.h"
#include "core/rendering/RenderRegion.h"
#include "core/rendering/RenderFlowThread.h"
namespace blink {
RenderRegion::RenderRegion(Element* element, RenderFlowThread* flowThread)
: RenderBlockFlow(element)
, m_flowThread(flowThread)
, m_isValid(false)
{
}
LayoutUnit RenderRegion::pageLogicalWidth() const
{
ASSERT(m_flowThread);
return m_flowThread->isHorizontalWritingMode() ? contentWidth() : contentHeight();
}
LayoutUnit RenderRegion::pageLogicalHeight() const
{
ASSERT(m_flowThread);
return m_flowThread->isHorizontalWritingMode() ? contentHeight() : contentWidth();
}
LayoutRect RenderRegion::flowThreadPortionOverflowRect() const
{
return overflowRectForFlowThreadPortion(flowThreadPortionRect(), isFirstRegion(), isLastRegion());
}
LayoutRect RenderRegion::overflowRectForFlowThreadPortion(const LayoutRect& flowThreadPortionRect, bool isFirstPortion, bool isLastPortion) const
{
ASSERT(isValid());
if (hasOverflowClip())
return flowThreadPortionRect;
LayoutRect flowThreadOverflow = m_flowThread->visualOverflowRect();
// Only clip along the flow thread axis.
LayoutRect clipRect;
if (m_flowThread->isHorizontalWritingMode()) {
LayoutUnit minY = isFirstPortion ? flowThreadOverflow.y() : flowThreadPortionRect.y();
LayoutUnit maxY = isLastPortion ? std::max(flowThreadPortionRect.maxY(), flowThreadOverflow.maxY()) : flowThreadPortionRect.maxY();
LayoutUnit minX = std::min(flowThreadPortionRect.x(), flowThreadOverflow.x());
LayoutUnit maxX = std::max(flowThreadPortionRect.maxX(), flowThreadOverflow.maxX());
clipRect = LayoutRect(minX, minY, maxX - minX, maxY - minY);
} else {
LayoutUnit minX = isFirstPortion ? flowThreadOverflow.x() : flowThreadPortionRect.x();
LayoutUnit maxX = isLastPortion ? std::max(flowThreadPortionRect.maxX(), flowThreadOverflow.maxX()) : flowThreadPortionRect.maxX();
LayoutUnit minY = std::min(flowThreadPortionRect.y(), (flowThreadOverflow.y()));
LayoutUnit maxY = std::max(flowThreadPortionRect.y(), (flowThreadOverflow.maxY()));
clipRect = LayoutRect(minX, minY, maxX - minX, maxY - minY);
}
return clipRect;
}
bool RenderRegion::isFirstRegion() const
{
ASSERT(isValid());
return m_flowThread->firstRegion() == this;
}
bool RenderRegion::isLastRegion() const
{
ASSERT(isValid());
return m_flowThread->lastRegion() == this;
}
void RenderRegion::layoutBlock(bool relayoutChildren)
{
RenderBlockFlow::layoutBlock(relayoutChildren);
// FIXME: We need to find a way to set up overflow properly. Our flow thread hasn't gotten a layout
// yet, so we can't look to it for correct information. It's possible we could wait until after the RenderFlowThread
// gets a layout, and then try to propagate overflow information back to the region, and then mark for a second layout.
// That second layout would then be able to use the information from the RenderFlowThread to set up overflow.
//
// The big problem though is that overflow needs to be region-specific. We can't simply use the RenderFlowThread's global
// overflow values, since then we'd always think any narrow region had huge overflow (all the way to the width of the
// RenderFlowThread itself).
}
void RenderRegion::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
if (!isValid()) {
RenderBlockFlow::computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
return;
}
minLogicalWidth = m_flowThread->minPreferredLogicalWidth();
maxLogicalWidth = m_flowThread->maxPreferredLogicalWidth();
}
} // namespace blink
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