void RenderFlowThread::updateRegionsFlowThreadPortionRect()
{
LayoutUnit logicalHeight = 0;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
LayoutUnit regionLogicalWidth = region->pageLogicalWidth();
LayoutUnit regionLogicalHeight = region->logicalHeightOfAllFlowThreadContent();
LayoutRect regionRect(style()->direction() == LTR ? LayoutUnit() : logicalWidth() - regionLogicalWidth, logicalHeight, regionLogicalWidth, regionLogicalHeight);
// When a flow thread has more than one auto logical height region,
// we have to take into account the override logical content height value,
// if computed for an auto logical height region, and use it to set the height
// for the region rect. This way, the regions in the chain following the auto
// logical height region, will be able to fragment the right part of their
// associated flow thread content (and compute their overrideComputedLogicalHeight properly).
if (view()->normalLayoutPhase()) {
ASSERT(region->hasOverrideHeight() || !region->hasAutoLogicalHeight());
if (region->hasOverrideHeight())
regionLogicalHeight = region->overrideLogicalContentHeight();
regionRect.setHeight(regionLogicalHeight);
}
region->setFlowThreadPortionRect(isHorizontalWritingMode() ? regionRect : regionRect.transposedRect());
logicalHeight += regionLogicalHeight;
}
}
RenderRegion* RenderFlowThread::regionAtBlockOffset(LayoutUnit offset, bool extendLastRegion) const
{
ASSERT(!m_regionsInvalidated);
// If no region matches the position and extendLastRegion is true, it will return
// the last valid region. It is similar to auto extending the size of the last region.
RenderRegion* lastValidRegion = 0;
LayoutUnit accumulatedLogicalHeight = 0;
// FIXME: The regions are always in order, optimize this search.
for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (offset <= 0)
return region;
if (extendLastRegion || region->isRenderRegionSet())
lastValidRegion = region;
if (region->hasOverrideHeight() && view()->normalLayoutPhase()) {
accumulatedLogicalHeight += region->overrideLogicalContentHeight();
if (offset < accumulatedLogicalHeight)
return region;
continue;
}
LayoutRect regionRect = region->flowThreadPortionRect();
accumulatedLogicalHeight += isHorizontalWritingMode() ? regionRect.height() : regionRect.width();
if (offset < accumulatedLogicalHeight)
return region;
}
return lastValidRegion;
}
