void RenderFlowThread::regionLayoutUpdateEventTimerFired(Timer<RenderFlowThread>*) { // Create a copy of region nodes, to protect them for being destroyed in the event listener Vector<RefPtr<Node> > regionNodes; regionNodes.reserveCapacity(m_regionList.size()); for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; ASSERT(region->node() && region->node()->isElementNode()); // dispatch the event only for marked regions and only for those who have a listener if (region->shouldDispatchRegionLayoutUpdateEvent()) { regionNodes.append(region->node()); // clear the dispatch flag here, as it is possible to be set again due to event listeners region->setDispatchRegionLayoutUpdateEvent(false); } } for (Vector<RefPtr<Node> >::const_iterator it = regionNodes.begin(); it != regionNodes.end(); ++it) { RefPtr<Node> node = *it; RefPtr<Document> document = node->document(); if (!document) continue; RenderObject* renderer = node->renderer(); if (renderer && renderer->isRenderRegion()) { node->dispatchRegionLayoutUpdateEvent(); // Layout needs to be uptodate after each event listener document->updateLayoutIgnorePendingStylesheets(); } } }
void RenderFlowThread::layout() { bool regionsChanged = m_regionsInvalidated && everHadLayout(); if (m_regionsInvalidated) { m_regionsInvalidated = false; m_hasValidRegions = false; m_regionsHaveUniformLogicalWidth = true; m_regionsHaveUniformLogicalHeight = true; m_regionRangeMap.clear(); LayoutUnit previousRegionLogicalWidth = 0; LayoutUnit previousRegionLogicalHeight = 0; if (hasRegions()) { for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; if (!region->isValid()) continue; ASSERT(!region->needsLayout()); region->deleteAllRenderBoxRegionInfo(); LayoutUnit regionLogicalWidth; LayoutUnit regionLogicalHeight; if (isHorizontalWritingMode()) { regionLogicalWidth = region->contentWidth(); regionLogicalHeight = region->contentHeight(); } else { regionLogicalWidth = region->contentHeight(); regionLogicalHeight = region->contentWidth(); } if (!m_hasValidRegions) m_hasValidRegions = true; else { if (m_regionsHaveUniformLogicalWidth && previousRegionLogicalWidth != regionLogicalWidth) m_regionsHaveUniformLogicalWidth = false; if (m_regionsHaveUniformLogicalHeight && previousRegionLogicalHeight != regionLogicalHeight) m_regionsHaveUniformLogicalHeight = false; } previousRegionLogicalWidth = regionLogicalWidth; } computeLogicalWidth(); // Called to get the maximum logical width for the region. LayoutUnit logicalHeight = 0; for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; if (!region->isValid()) continue; LayoutRect regionRect; if (isHorizontalWritingMode()) { regionRect = LayoutRect(style()->direction() == LTR ? zeroLayoutUnit : logicalWidth() - region->contentWidth(), logicalHeight, region->contentWidth(), region->contentHeight()); logicalHeight += regionRect.height(); } else { regionRect = LayoutRect(logicalHeight, style()->direction() == LTR ? zeroLayoutUnit : logicalWidth() - region->contentHeight(), region->contentWidth(), region->contentHeight()); logicalHeight += regionRect.width(); } region->setRegionRect(regionRect); } } } CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this); LayoutStateMaintainer statePusher(view(), this, regionsChanged); RenderBlock::layout(); statePusher.pop(); if (document()->hasListenerType(Document::REGIONLAYOUTUPDATE_LISTENER) && !m_regionLayoutUpdateEventTimer.isActive()) for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; if (region->shouldDispatchRegionLayoutUpdateEvent()) { // at least one region needs to dispatch the event m_regionLayoutUpdateEventTimer.startOneShot(0); break; } } }