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; }
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; // FIXME: The regions are always in order, optimize this search. bool useHorizontalWritingMode = isHorizontalWritingMode(); for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; if (!region->isValid()) continue; if (offset <= 0) return region; LayoutRect regionRect = region->flowThreadPortionRect(); if ((useHorizontalWritingMode && offset < regionRect.maxY()) || (!useHorizontalWritingMode && offset < regionRect.maxX())) return region; if (extendLastRegion || region->isRenderRegionSet()) lastValidRegion = region; } return lastValidRegion; }
void RenderFlowThread::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const { computedValues.m_position = logicalTop; computedValues.m_extent = 0; for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; ASSERT(!region->needsLayout() || region->isRenderRegionSet()); computedValues.m_extent += region->logicalHeightOfAllFlowThreadContent(); } }
void RenderFlowThread::validateRegions() { if (m_regionsInvalidated) { m_regionsInvalidated = false; m_regionsHaveUniformLogicalWidth = true; m_regionsHaveUniformLogicalHeight = true; if (hasRegions()) { LayoutUnit previousRegionLogicalWidth = 0; LayoutUnit previousRegionLogicalHeight = 0; bool firstRegionVisited = false; for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; ASSERT(!region->needsLayout() || region->isRenderRegionSet()); region->deleteAllRenderBoxRegionInfo(); // In the normal layout phase we need to initialize the overrideLogicalContentHeight for auto-height regions. // See initializeRegionsOverrideLogicalContentHeight for the explanation. // Also, if we have auto-height regions we can't assume m_regionsHaveUniformLogicalHeight to be true in the first phase // because the auto-height regions don't have their height computed yet. if (view()->normalLayoutPhase() && region->hasAutoLogicalHeight()) { region->setOverrideLogicalContentHeight(region->maxPageLogicalHeight()); m_regionsHaveUniformLogicalHeight = false; } LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); LayoutUnit regionLogicalHeight = region->pageLogicalHeight(); if (!firstRegionVisited) firstRegionVisited = true; else { if (m_regionsHaveUniformLogicalWidth && previousRegionLogicalWidth != regionLogicalWidth) m_regionsHaveUniformLogicalWidth = false; if (m_regionsHaveUniformLogicalHeight && previousRegionLogicalHeight != regionLogicalHeight) m_regionsHaveUniformLogicalHeight = false; } previousRegionLogicalWidth = regionLogicalWidth; } } } updateLogicalWidth(); // Called to get the maximum logical width for the region. updateRegionsFlowThreadPortionRect(); }
void RenderFlowThread::updateLogicalWidth() { LayoutUnit logicalWidth = initialLogicalWidth(); for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; ASSERT(!region->needsLayout() || region->isRenderRegionSet()); logicalWidth = max(region->pageLogicalWidth(), logicalWidth); } setLogicalWidth(logicalWidth); // If the regions have non-uniform logical widths, then insert inset information for the RenderFlowThread. for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; LayoutUnit regionLogicalWidth = region->pageLogicalWidth(); if (regionLogicalWidth != logicalWidth) { LayoutUnit logicalLeft = style()->direction() == LTR ? LayoutUnit() : logicalWidth - regionLogicalWidth; region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth, false); } } }
bool RenderFlowThread::logicalWidthChangedInRegions(const RenderBlock* block, LayoutUnit offsetFromLogicalTopOfFirstPage) { if (!hasRegions()) return false; RenderRegion* startRegion; RenderRegion* endRegion; getRegionRangeForBox(block, startRegion, endRegion); // When the region chain is invalidated the box information is discarded so we must assume the width has changed. if (m_pageLogicalSizeChanged && !startRegion) return true; // Not necessary for the flow thread, since we already computed the correct info for it. if (block == this) return false; for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) { RenderRegion* region = *iter; ASSERT(!region->needsLayout() || region->isRenderRegionSet()); OwnPtr<RenderBoxRegionInfo> oldInfo = region->takeRenderBoxRegionInfo(block); if (!oldInfo) continue; LayoutUnit oldLogicalWidth = oldInfo->logicalWidth(); RenderBoxRegionInfo* newInfo = block->renderBoxRegionInfo(region, offsetFromLogicalTopOfFirstPage); if (!newInfo || newInfo->logicalWidth() != oldLogicalWidth) return true; if (region == endRegion) break; } return false; }