void RenderFlowThread::updateLogicalWidth()
{
LayoutUnit logicalWidth = 0;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
ASSERT(!region->needsLayout());
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;
if (!region->isValid())
continue;
LayoutUnit regionLogicalWidth = region->pageLogicalWidth();
if (regionLogicalWidth != logicalWidth) {
LayoutUnit logicalLeft = style()->direction() == LTR ? ZERO_LAYOUT_UNIT : logicalWidth - regionLogicalWidth;
region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth, false);
}
}
}
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;
}
}
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();
}
LayoutUnit RenderFlowThread::pageLogicalWidthForOffset(LayoutUnit offset) const
{
RenderRegion* region = regionAtBlockOffset(offset, true);
return region ? region->pageLogicalWidth() : contentLogicalWidth();
}
void RenderFlowThread::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
m_pageLogicalHeightChanged = m_regionsInvalidated && everHadLayout();
if (m_regionsInvalidated) {
m_regionsInvalidated = false;
m_regionsHaveUniformLogicalWidth = true;
m_regionsHaveUniformLogicalHeight = true;
m_regionRangeMap.clear();
m_breakBeforeToRegionMap.clear();
m_breakAfterToRegionMap.clear();
LayoutUnit previousRegionLogicalWidth = 0;
LayoutUnit previousRegionLogicalHeight = 0;
bool firstRegionVisited = false;
if (hasRegions()) {
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
ASSERT(!region->needsLayout());
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();
}
}
CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this);
RenderBlock::layout();
m_pageLogicalHeightChanged = false;
if (lastRegion())
lastRegion()->expandToEncompassFlowThreadContentsIfNeeded();
if (shouldDispatchRegionLayoutUpdateEvent())
dispatchRegionLayoutUpdateEvent();
}
void RenderFlowThread::layout()
{
m_pageLogicalHeightChanged = 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 = region->pageLogicalWidth();
LayoutUnit regionLogicalHeight = region->pageLogicalHeight();
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;
}
updateLogicalWidth(); // 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;
LayoutUnit regionLogicalWidth = region->pageLogicalWidth();
LayoutUnit regionLogicalHeight = region->logicalHeightOfAllFlowThreadContent();
LayoutRect regionRect(style()->direction() == LTR ? ZERO_LAYOUT_UNIT : logicalWidth() - regionLogicalWidth, logicalHeight, regionLogicalWidth, regionLogicalHeight);
region->setFlowThreadPortionRect(isHorizontalWritingMode() ? regionRect : regionRect.transposedRect());
logicalHeight += regionLogicalHeight;
}
}
}
CurrentRenderFlowThreadMaintainer currentFlowThreadSetter(this);
RenderBlock::layout();
m_pageLogicalHeightChanged = false;
if (lastRegion())
lastRegion()->expandToEncompassFlowThreadContentsIfNeeded();
if (shouldDispatchRegionLayoutUpdateEvent())
dispatchRegionLayoutUpdateEvent();
}
