void RenderNamedFlowThread::removeRegionFromThread(RenderRegion* renderRegion)
{
ASSERT(renderRegion);
RenderNamedFlowFragment* renderNamedFlowFragment = toRenderNamedFlowFragment(renderRegion);
if (renderNamedFlowFragment->parentNamedFlowThread()) {
if (!renderNamedFlowFragment->isValid()) {
ASSERT(m_invalidRegionList.contains(renderNamedFlowFragment));
m_invalidRegionList.remove(renderNamedFlowFragment);
renderNamedFlowFragment->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(renderNamedFlowFragment->parentNamedFlowThread());
}
ASSERT(m_regionList.contains(renderNamedFlowFragment));
bool wasFirst = m_regionList.first() == renderNamedFlowFragment;
m_regionList.remove(renderNamedFlowFragment);
if (canBeDestroyed())
setMarkForDestruction();
if (!m_regionList.isEmpty() && wasFirst)
updateWritingMode();
invalidateRegions();
}
void RenderNamedFlowThread::checkInvalidRegions()
{
Vector<RenderNamedFlowFragment*> newValidFragments;
for (auto& region : m_invalidRegionList) {
RenderNamedFlowFragment* namedFlowFragment = toRenderNamedFlowFragment(region);
// The only reason a region would be invalid is because it has a parent flow thread.
ASSERT(!namedFlowFragment->isValid() && namedFlowFragment->parentNamedFlowThread());
if (namedFlowFragment->parentNamedFlowThread()->dependsOn(this))
continue;
newValidFragments.append(namedFlowFragment);
}
for (auto& namedFlowFragment : newValidFragments) {
m_invalidRegionList.remove(namedFlowFragment);
namedFlowFragment->parentNamedFlowThread()->m_observerThreadsSet.remove(this);
addFragmentToNamedFlowThread(namedFlowFragment);
}
if (!newValidFragments.isEmpty())
invalidateRegions();
if (m_observerThreadsSet.isEmpty())
return;
// Notify all the flow threads that were dependent on this flow.
// Create a copy of the list first. That's because observers might change the list when calling checkInvalidRegions.
Vector<RenderNamedFlowThread*> observers;
copyToVector(m_observerThreadsSet, observers);
for (auto& flowThread : observers)
flowThread->checkInvalidRegions();
}
void RenderNamedFlowThread::addRegionToThread(RenderRegion* renderRegion)
{
ASSERT(renderRegion);
ASSERT(!renderRegion->isValid());
RenderNamedFlowFragment* renderNamedFlowFragment = toRenderNamedFlowFragment(renderRegion);
resetMarkForDestruction();
if (renderNamedFlowFragment->parentNamedFlowThread() && renderNamedFlowFragment->parentNamedFlowThread()->dependsOn(this)) {
// The order of invalid regions is irrelevant.
m_invalidRegionList.add(renderNamedFlowFragment);
// Register ourself to get a notification when the state changes.
renderNamedFlowFragment->parentNamedFlowThread()->m_observerThreadsSet.add(this);
return;
}
addFragmentToNamedFlowThread(renderNamedFlowFragment);
invalidateRegions();
}