void RenderFlowThread::removeRenderBoxRegionInfo(RenderBox* box)
{
if (!hasRegions())
return;
RenderRegion* startRegion;
RenderRegion* endRegion;
getRegionRangeForBox(box, startRegion, endRegion);
for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
region->removeRenderBoxRegionInfo(box);
if (region == endRegion)
break;
}
#ifndef NDEBUG
// We have to make sure we did not leave any RenderBoxRegionInfo attached.
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
ASSERT(!region->renderBoxRegionInfo(box));
}
#endif
m_regionRangeMap.remove(box);
}
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 RenderNamedFlowThread::checkInvalidRegions()
{
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
// The only reason a region would be invalid is because it has a parent flow thread.
ASSERT(region->isValid() || region->parentNamedFlowThread());
if (region->isValid() || region->parentNamedFlowThread()->dependsOn(this))
continue;
region->parentNamedFlowThread()->m_observerThreadsSet.remove(this);
addDependencyOnFlowThread(region->parentNamedFlowThread());
region->setIsValid(true);
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 (size_t i = 0; i < observers.size(); ++i) {
RenderNamedFlowThread* flowThread = observers.at(i);
flowThread->checkInvalidRegions();
}
}
void RenderFlowThread::computeLogicalWidth()
{
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(isHorizontalWritingMode() ? region->contentWidth() : region->contentHeight(), 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 = isHorizontalWritingMode() ? region->contentWidth() : region->contentHeight();
if (regionLogicalWidth != logicalWidth) {
LayoutUnit logicalLeft = style()->direction() == LTR ? zeroLayoutUnit : logicalWidth - regionLogicalWidth;
region->setRenderBoxRegionInfo(this, logicalLeft, regionLogicalWidth, false);
}
}
}
bool RenderFlowThread::logicalWidthChangedInRegions(const RenderBlock* block, LayoutUnit offsetFromLogicalTopOfFirstPage)
{
if (!hasRegions() || block == this) // Not necessary, since if any region changes, we do a full pagination relayout anyway.
return false;
RenderRegion* startRegion;
RenderRegion* endRegion;
getRegionRangeForBox(block, startRegion, endRegion);
for (RenderRegionList::iterator iter = m_regionList.find(startRegion); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
ASSERT(!region->needsLayout());
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;
}
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::repaintRectangleInRegions(const LayoutRect& repaintRect, bool immediate)
{
if (!shouldRepaint(repaintRect) || !hasValidRegionInfo())
return;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
// We only have to issue a repaint in this region if the region rect intersects the repaint rect.
LayoutRect flippedRegionRect(region->regionRect());
LayoutRect flippedRegionOverflowRect(region->regionOverflowRect());
flipForWritingMode(flippedRegionRect); // Put the region rects into physical coordinates.
flipForWritingMode(flippedRegionOverflowRect);
LayoutRect clippedRect(repaintRect);
clippedRect.intersect(flippedRegionOverflowRect);
if (clippedRect.isEmpty())
continue;
// Put the region rect into the region's physical coordinate space.
clippedRect.setLocation(region->contentBoxRect().location() + (clippedRect.location() - flippedRegionRect.location()));
// Now switch to the region's writing mode coordinate space and let it repaint itself.
region->flipForWritingMode(clippedRect);
LayoutStateDisabler layoutStateDisabler(view()); // We can't use layout state to repaint, since the region is somewhere else.
// Can't use currentFlowThread as it possible to have imbricated flow threads and the wrong one could be used,
// so, we let each region figure out the proper enclosing flow thread
CurrentRenderFlowThreadDisabler disabler(view());
region->repaintRectangle(clippedRect, immediate);
}
}
RenderRegion* RenderFlowThread::lastRegion() const
{
if (!hasValidRegionInfo())
return 0;
for (RenderRegionList::const_reverse_iterator iter = m_regionList.rbegin(); iter != m_regionList.rend(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
return region;
}
return 0;
}
LayoutUnit RenderFlowThread::contentLogicalLeftOfFirstRegion() const
{
if (!hasValidRegionInfo())
return 0;
for (RenderRegionList::const_iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
return isHorizontalWritingMode() ? region->flowThreadPortionRect().x() : region->flowThreadPortionRect().y();
}
ASSERT_NOT_REACHED();
return 0;
}
void RenderFlowThread::updateLogicalHeight()
{
LayoutUnit logicalHeight = 0;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
ASSERT(!region->needsLayout());
logicalHeight += region->logicalHeightOfAllFlowThreadContent();
}
setLogicalHeight(logicalHeight);
}
// Check if the content is flown into at least a region with region styling rules.
void RenderFlowThread::checkRegionsWithStyling()
{
bool hasRegionsWithStyling = false;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
if (region->hasCustomRegionStyle()) {
hasRegionsWithStyling = true;
break;
}
}
m_hasRegionsWithStyling = hasRegionsWithStyling;
}
void RenderFlowThread::computeLogicalHeight()
{
LayoutUnit logicalHeight = 0;
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
ASSERT(!region->needsLayout());
logicalHeight += isHorizontalWritingMode() ? region->contentHeight() : region->contentWidth();
}
setLogicalHeight(logicalHeight);
}
static void writeRenderNamedFlowThreads(TextStream& ts, RenderView* renderView, const RenderLayer* rootLayer,
const LayoutRect& paintRect, int indent, RenderAsTextBehavior behavior)
{
if (!renderView->hasRenderNamedFlowThreads())
return;
const RenderNamedFlowThreadList* list = renderView->flowThreadController()->renderNamedFlowThreadList();
writeIndent(ts, indent);
ts << "Flow Threads\n";
for (RenderNamedFlowThreadList::const_iterator iter = list->begin(); iter != list->end(); ++iter) {
const RenderNamedFlowThread* renderFlowThread = *iter;
writeIndent(ts, indent + 1);
ts << "Thread with flow-name '" << renderFlowThread->flowThreadName() << "'\n";
RenderLayer* layer = renderFlowThread->layer();
writeLayers(ts, rootLayer, layer, paintRect, indent + 2, behavior);
// Display the render regions attached to this flow thread
const RenderRegionList& flowThreadRegionList = renderFlowThread->renderRegionList();
if (!flowThreadRegionList.isEmpty()) {
writeIndent(ts, indent + 1);
ts << "Regions for flow '"<< renderFlowThread->flowThreadName() << "'\n";
for (RenderRegionList::const_iterator itRR = flowThreadRegionList.begin(); itRR != flowThreadRegionList.end(); ++itRR) {
RenderRegion* renderRegion = *itRR;
writeIndent(ts, indent + 2);
ts << "RenderRegion";
if (renderRegion->node()) {
String tagName = getTagName(renderRegion->node());
if (!tagName.isEmpty())
ts << " {" << tagName << "}";
if (renderRegion->node()->isElementNode() && renderRegion->node()->hasID()) {
Element* element = static_cast<Element*>(renderRegion->node());
ts << " #" << element->idForStyleResolution();
}
if (renderRegion->hasCustomRegionStyle())
ts << " region style: 1";
}
if (!renderRegion->isValid())
ts << " invalid";
ts << "\n";
}
}
}
}
void RenderFlowThread::repaintRectangleInRegions(const LayoutRect& repaintRect, bool immediate)
{
if (!shouldRepaint(repaintRect) || !hasValidRegionInfo())
return;
LayoutStateDisabler layoutStateDisabler(view()); // We can't use layout state to repaint, since the regions are somewhere else.
// We can't use currentFlowThread as it is possible to have interleaved flow threads and the wrong one could be used.
// Let each region figure out the proper enclosing flow thread.
CurrentRenderFlowThreadDisabler disabler(view());
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid())
continue;
region->repaintFlowThreadContent(repaintRect, immediate);
}
}
void RenderFlowThread::computeOverflowStateForRegions(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 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();
RenderRegion* lastReg = lastRegion();
for (RenderRegionList::iterator iter = m_regionList.begin(); iter != m_regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (!region->isValid()) {
region->setRegionState(RenderRegion::RegionUndefined);
continue;
}
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);
}
// 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;
}
static PassRefPtr<InspectorArray> buildObjectForRendererFragments(RenderObject* renderer, const HighlightConfig& config)
{
RefPtr<InspectorArray> fragmentsArray = InspectorArray::create();
RenderFlowThread* containingFlowThread = renderer->flowThreadContainingBlock();
if (!containingFlowThread) {
Highlight highlight;
buildRendererHighlight(renderer, nullptr, config, &highlight, InspectorOverlay::CoordinateSystem::View);
fragmentsArray->pushObject(buildObjectForHighlight(highlight));
} else {
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (!containingFlowThread->getRegionRangeForBox(&renderer->enclosingBox(), startRegion, endRegion)) {
// The flow has no visible regions. The renderer is not visible on screen.
return nullptr;
}
const RenderRegionList& regionList = containingFlowThread->renderRegionList();
for (RenderRegionList::const_iterator iter = regionList.find(startRegion); iter != regionList.end(); ++iter) {
RenderRegion* region = *iter;
if (region->isValid()) {
// Compute the highlight of the fragment inside the current region.
Highlight highlight;
buildRendererHighlight(renderer, region, config, &highlight, InspectorOverlay::CoordinateSystem::View);
RefPtr<InspectorObject> fragmentObject = buildObjectForHighlight(highlight);
// Compute the clipping area of the region.
fragmentObject->setObject("region", buildObjectForCSSRegionContentClip(region));
fragmentsArray->pushObject(fragmentObject.release());
}
if (region == endRegion)
break;
}
}
return fragmentsArray.release();
}
static void writeRenderRegionList(const RenderRegionList& flowThreadRegionList, TextStream& ts, int indent)
{
for (RenderRegionList::const_iterator itRR = flowThreadRegionList.begin(); itRR != flowThreadRegionList.end(); ++itRR) {
RenderRegion* renderRegion = *itRR;
writeIndent(ts, indent + 2);
ts << "RenderRegion";
if (renderRegion->generatingNode()) {
String tagName = getTagName(renderRegion->generatingNode());
if (!tagName.isEmpty())
ts << " {" << tagName << "}";
if (renderRegion->generatingNode()->isElementNode() && renderRegion->generatingNode()->hasID()) {
Element* element = static_cast<Element*>(renderRegion->generatingNode());
ts << " #" << element->idForStyleResolution();
}
if (renderRegion->hasCustomRegionStyle())
ts << " region style: 1";
if (renderRegion->hasAutoLogicalHeight())
ts << " hasAutoLogicalHeight";
}
if (!renderRegion->isValid())
ts << " invalid";
ts << "\n";
}
}
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();
}
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;
}
}
}
