void RenderNamedFlowThread::removeRegionFromThread(RenderRegion* renderRegion)
{
ASSERT(renderRegion);
m_regionRangeMap.clear();
m_regionList.remove(renderRegion);
if (renderRegion->parentNamedFlowThread()) {
if (!renderRegion->isValid()) {
renderRegion->parentNamedFlowThread()->m_observerThreadsSet.remove(this);
// No need to invalidate the regions rectangles. The removed region
// was not taken into account. Just return here.
return;
}
removeDependencyOnFlowThread(renderRegion->parentNamedFlowThread());
}
if (canBeDestroyed())
setMarkForDestruction();
// After removing all the regions in the flow the following layout needs to dispatch the regionLayoutUpdate event
if (m_regionList.isEmpty())
setDispatchRegionLayoutUpdateEvent(true);
invalidateRegions();
}
void RenderFlowThread::computeOverflowStateForRegions(LayoutUnit oldClientAfterEdge)
{
LayoutUnit height = oldClientAfterEdge;
LayoutUnit offsetBreakAdjustment = 0;
// Simulate a region break at height. If it points inside an auto logical height region,
// then it may determine the region override logical content height.
addForcedRegionBreak(height, this, false, &offsetBreakAdjustment);
// During the normal layout phase of the flow thread all the auto-height regions have the overrideLogicalContentHeight set to max height.
// We need to clear the overrideLogicalContentHeight for all the regions that didn't receive any content, starting with firstEmptyRegion.
RenderRegion* firstEmptyRegion = 0;
if (view()->normalLayoutPhase())
firstEmptyRegion = regionAtBlockOffset(height + offsetBreakAdjustment);
// FIXME: the visual overflow of middle region (if it is the last one to contain any content in a render flow thread)
// might not be taken into account because the render flow thread height is greater that that regions height + its visual overflow
// because of how computeLogicalHeight is implemented for RenderFlowThread (as a sum of all regions height).
// This means that the middle region will be marked as fit (even if it has visual overflow flowing into the next region)
if (hasRenderOverflow()
&& ( (isHorizontalWritingMode() && visualOverflowRect().maxY() > clientBoxRect().maxY())
|| (!isHorizontalWritingMode() && visualOverflowRect().maxX() > clientBoxRect().maxX())))
height = isHorizontalWritingMode() ? visualOverflowRect().maxY() : visualOverflowRect().maxX();
bool inEmptyRegionsSection = false;
RenderRegion* lastReg = lastRegion();
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
LayoutUnit flowMin = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().y() : region->flowThreadPortionRect().x());
LayoutUnit flowMax = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().maxY() : region->flowThreadPortionRect().maxX());
RenderRegion::RegionState previousState = region->regionState();
RenderRegion::RegionState state = RenderRegion::RegionFit;
if (flowMin <= 0)
state = RenderRegion::RegionEmpty;
if (flowMax > 0 && region == lastReg)
state = RenderRegion::RegionOverset;
region->setRegionState(state);
// determine whether the NamedFlow object should dispatch a regionLayoutUpdate event
// FIXME: currently it cannot determine whether a region whose regionOverset state remained either "fit" or "overset" has actually
// changed, so it just assumes that the NamedFlow should dispatch the event
if (previousState != state
|| state == RenderRegion::RegionFit
|| state == RenderRegion::RegionOverset)
setDispatchRegionLayoutUpdateEvent(true);
if (region == firstEmptyRegion)
inEmptyRegionsSection = true;
// Clear the overrideLogicalContentHeight value for autoheight regions that didn't receive any content.
if (inEmptyRegionsSection && region->hasAutoLogicalHeight())
region->clearOverrideLogicalContentHeight();
}
// With the regions overflow state computed we can also set the overset flag for the named flow.
// If there are no valid regions in the chain, overset is true.
m_overset = lastReg ? lastReg->regionState() == RenderRegion::RegionOverset : true;
}
void RenderNamedFlowThread::computeOversetStateForRegions(LayoutUnit oldClientAfterEdge)
{
LayoutUnit height = oldClientAfterEdge;
// FIXME: the visual overflow of middle region (if it is the last one to contain any content in a render flow thread)
// might not be taken into account because the render flow thread height is greater that that regions height + its visual overflow
// because of how computeLogicalHeight is implemented for RenderNamedFlowThread (as a sum of all regions height).
// This means that the middle region will be marked as fit (even if it has visual overflow flowing into the next region)
if (hasRenderOverflow()
&& ( (isHorizontalWritingMode() && visualOverflowRect().maxY() > clientBoxRect().maxY())
|| (!isHorizontalWritingMode() && visualOverflowRect().maxX() > clientBoxRect().maxX())))
height = isHorizontalWritingMode() ? visualOverflowRect().maxY() : visualOverflowRect().maxX();
RenderRegion* lastReg = lastRegion();
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
LayoutUnit flowMin = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().y() : region->flowThreadPortionRect().x());
LayoutUnit flowMax = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().maxY() : region->flowThreadPortionRect().maxX());
RegionOversetState previousState = region->regionOversetState();
RegionOversetState state = RegionFit;
if (flowMin <= 0)
state = RegionEmpty;
if (flowMax > 0 && region == lastReg)
state = RegionOverset;
region->setRegionOversetState(state);
// determine whether the NamedFlow object should dispatch a regionLayoutUpdate event
// FIXME: currently it cannot determine whether a region whose regionOverset state remained either "fit" or "overset" has actually
// changed, so it just assumes that the NamedFlow should dispatch the event
if (previousState != state
|| state == RegionFit
|| state == RegionOverset)
setDispatchRegionLayoutUpdateEvent(true);
if (previousState != state)
setDispatchRegionOversetChangeEvent(true);
}
// If the number of regions has changed since we last computed the overset property, schedule the regionOversetChange event.
if (previousRegionCountChanged()) {
setDispatchRegionOversetChangeEvent(true);
updatePreviousRegionCount();
}
// With the regions overflow state computed we can also set the overset flag for the named flow.
// If there are no valid regions in the chain, overset is true.
m_overset = lastReg ? lastReg->regionOversetState() == RegionOverset : true;
}
