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/*
* Copyright 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 "RenderRegion.h"
#include "CSSStyleSelector.h"
#include "GraphicsContext.h"
#include "HitTestResult.h"
#include "IntRect.h"
#include "PaintInfo.h"
#include "RenderBoxRegionInfo.h"
#include "RenderFlowThread.h"
#include "RenderView.h"
namespace WebCore {
RenderRegion::RenderRegion(Node* node, RenderFlowThread* flowThread)
: RenderReplaced(node, IntSize())
, m_flowThread(flowThread)
, m_parentFlowThread(0)
, m_isValid(false)
, m_hasCustomRegionStyle(false)
{
}
RenderRegion::~RenderRegion()
{
deleteAllRenderBoxRegionInfo();
}
LayoutRect RenderRegion::regionOverflowRect() const
{
// FIXME: Would like to just use hasOverflowClip() but we aren't a block yet. When RenderRegion is eliminated and
// folded into RenderBlock, switch to hasOverflowClip().
bool clipX = style()->overflowX() != OVISIBLE;
bool clipY = style()->overflowY() != OVISIBLE;
if ((clipX && clipY) || !isValid() || !m_flowThread)
return regionRect();
LayoutRect flowThreadOverflow = m_flowThread->visualOverflowRect();
// Only clip along the flow thread axis.
LayoutUnit outlineSize = maximalOutlineSize(PaintPhaseOutline);
LayoutRect clipRect;
if (m_flowThread->isHorizontalWritingMode()) {
LayoutUnit minY = isFirstRegion() ? (flowThreadOverflow.y() - outlineSize) : regionRect().y();
LayoutUnit maxY = isLastRegion() ? max(regionRect().maxY(), flowThreadOverflow.maxY()) + outlineSize : regionRect().maxY();
LayoutUnit minX = clipX ? regionRect().x() : (flowThreadOverflow.x() - outlineSize);
LayoutUnit maxX = clipX ? regionRect().maxX() : (flowThreadOverflow.maxX() + outlineSize);
clipRect = LayoutRect(minX, minY, maxX - minX, maxY - minY);
} else {
LayoutUnit minX = isFirstRegion() ? (flowThreadOverflow.x() - outlineSize) : regionRect().x();
LayoutUnit maxX = isLastRegion() ? max(regionRect().maxX(), flowThreadOverflow.maxX()) + outlineSize : regionRect().maxX();
LayoutUnit minY = clipY ? regionRect().y() : (flowThreadOverflow.y() - outlineSize);
LayoutUnit maxY = clipY ? regionRect().maxY() : (flowThreadOverflow.maxY() + outlineSize);
clipRect = LayoutRect(minX, minY, maxX - minX, maxY - minY);
}
return clipRect;
}
bool RenderRegion::isFirstRegion() const
{
ASSERT(isValid() && m_flowThread);
return m_flowThread->firstRegion() == this;
}
bool RenderRegion::isLastRegion() const
{
ASSERT(isValid() && m_flowThread);
return m_flowThread->lastRegion() == this;
}
void RenderRegion::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
// Delegate painting of content in region to RenderFlowThread.
if (!m_flowThread || !isValid())
return;
m_flowThread->paintIntoRegion(paintInfo, this, LayoutPoint(paintOffset.x() + borderLeft() + paddingLeft(), paintOffset.y() + borderTop() + paddingTop()));
}
// Hit Testing
bool RenderRegion::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const LayoutPoint& pointInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
if (!isValid())
return false;
LayoutPoint adjustedLocation = accumulatedOffset + location();
// Check our bounds next. For this purpose always assume that we can only be hit in the
// foreground phase (which is true for replaced elements like images).
LayoutRect boundsRect(adjustedLocation, size());
if (visibleToHitTesting() && action == HitTestForeground && boundsRect.intersects(result.rectForPoint(pointInContainer))) {
// Check the contents of the RenderFlowThread.
if (m_flowThread && m_flowThread->hitTestRegion(this, request, result, pointInContainer, LayoutPoint(adjustedLocation.x() + borderLeft() + paddingLeft(), adjustedLocation.y() + borderTop() + paddingTop())))
return true;
updateHitTestResult(result, pointInContainer - toLayoutSize(adjustedLocation));
if (!result.addNodeToRectBasedTestResult(node(), pointInContainer, boundsRect))
return true;
}
return false;
}
void RenderRegion::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderReplaced::styleDidChange(diff, oldStyle);
bool customRegionStyle = false;
if (node()) {
Element* regionElement = static_cast<Element*>(node());
customRegionStyle = view()->document()->styleSelector()->checkRegionStyle(regionElement);
}
setHasCustomRegionStyle(customRegionStyle);
}
void RenderRegion::layout()
{
RenderReplaced::layout();
if (m_flowThread && isValid()) {
if (regionRect().width() != contentWidth() || regionRect().height() != contentHeight())
m_flowThread->invalidateRegions();
}
// 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).
//
// We'll need to expand RenderBoxRegionInfo to also hold left and right overflow values.
}
void RenderRegion::attachRegion()
{
if (!m_flowThread)
return;
// By now the flow thread should already be added to the rendering tree,
// so we go up the rendering parents and check that this region is not part of the same
// flow that it actually needs to display. It would create a circular reference.
RenderObject* parentObject = parent();
m_parentFlowThread = 0;
for ( ; parentObject; parentObject = parentObject->parent()) {
if (parentObject->isRenderFlowThread()) {
m_parentFlowThread = toRenderFlowThread(parentObject);
// Do not take into account a region that links a flow with itself. The dependency
// cannot change, so it is not worth adding it to the list.
if (m_flowThread == m_parentFlowThread) {
m_flowThread = 0;
return;
}
break;
}
}
m_flowThread->addRegionToThread(this);
}
void RenderRegion::detachRegion()
{
if (m_flowThread)
m_flowThread->removeRegionFromThread(this);
}
RenderBoxRegionInfo* RenderRegion::renderBoxRegionInfo(const RenderBox* box) const
{
if (!m_isValid || !m_flowThread)
return 0;
return m_renderBoxRegionInfo.get(box);
}
RenderBoxRegionInfo* RenderRegion::setRenderBoxRegionInfo(const RenderBox* box, LayoutUnit logicalLeftInset, LayoutUnit logicalRightInset,
bool containingBlockChainIsInset)
{
ASSERT(m_isValid && m_flowThread);
if (!m_isValid || !m_flowThread)
return 0;
RenderBoxRegionInfo* existingBoxInfo = m_renderBoxRegionInfo.get(box);
if (existingBoxInfo) {
*existingBoxInfo = RenderBoxRegionInfo(logicalLeftInset, logicalRightInset, containingBlockChainIsInset);
return existingBoxInfo;
}
RenderBoxRegionInfo* newBoxInfo = new RenderBoxRegionInfo(logicalLeftInset, logicalRightInset, containingBlockChainIsInset);
m_renderBoxRegionInfo.set(box, newBoxInfo);
return newBoxInfo;
}
RenderBoxRegionInfo* RenderRegion::takeRenderBoxRegionInfo(const RenderBox* box)
{
return m_renderBoxRegionInfo.take(box);
}
void RenderRegion::removeRenderBoxRegionInfo(const RenderBox* box)
{
delete m_renderBoxRegionInfo.take(box);
}
void RenderRegion::deleteAllRenderBoxRegionInfo()
{
deleteAllValues(m_renderBoxRegionInfo);
m_renderBoxRegionInfo.clear();
}
LayoutUnit RenderRegion::offsetFromLogicalTopOfFirstPage() const
{
if (!m_isValid || !m_flowThread)
return 0;
if (m_flowThread->isHorizontalWritingMode())
return regionRect().y();
return regionRect().x();
}
} // namespace WebCore
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