| /* |
| * Copyright (C) 2012 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS IN..0TERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "RenderNamedFlowThread.h" |
| |
| #include "ExceptionCodePlaceholder.h" |
| #include "FlowThreadController.h" |
| #include "InlineTextBox.h" |
| #include "InspectorInstrumentation.h" |
| #include "NodeRenderingTraversal.h" |
| #include "NodeTraversal.h" |
| #include "Position.h" |
| #include "Range.h" |
| #include "RenderInline.h" |
| #include "RenderNamedFlowFragment.h" |
| #include "RenderRegion.h" |
| #include "RenderText.h" |
| #include "RenderView.h" |
| #include "ShadowRoot.h" |
| #include "Text.h" |
| #include "WebKitNamedFlow.h" |
| |
| namespace WebCore { |
| |
| RenderNamedFlowThread::RenderNamedFlowThread(Document& document, PassRef<RenderStyle> style, PassRefPtr<WebKitNamedFlow> namedFlow) |
| : RenderFlowThread(document, std::move(style)) |
| , m_flowThreadChildList(adoptPtr(new FlowThreadChildList())) |
| , m_overset(true) |
| , m_hasRegionsWithStyling(false) |
| , m_namedFlow(namedFlow) |
| , m_regionLayoutUpdateEventTimer(this, &RenderNamedFlowThread::regionLayoutUpdateEventTimerFired) |
| , m_regionOversetChangeEventTimer(this, &RenderNamedFlowThread::regionOversetChangeEventTimerFired) |
| { |
| } |
| |
| RenderNamedFlowThread::~RenderNamedFlowThread() |
| { |
| // The flow thread can be destroyed without unregistering the content nodes if the document is destroyed. |
| // This can lead to problems because the nodes are still marked as belonging to a flow thread. |
| clearContentElements(); |
| |
| // Also leave the NamedFlow object in a consistent state by calling mark for destruction. |
| setMarkForDestruction(); |
| } |
| |
| const char* RenderNamedFlowThread::renderName() const |
| { |
| return "RenderNamedFlowThread"; |
| } |
| |
| void RenderNamedFlowThread::clearContentElements() |
| { |
| for (auto it = m_contentElements.begin(), end = m_contentElements.end(); it != end; ++it) { |
| Element* contentElement = *it; |
| |
| ASSERT(contentElement); |
| ASSERT(contentElement->inNamedFlow()); |
| ASSERT(&contentElement->document() == &document()); |
| |
| contentElement->clearInNamedFlow(); |
| } |
| |
| m_contentElements.clear(); |
| } |
| |
| void RenderNamedFlowThread::updateWritingMode() |
| { |
| RenderRegion* firstRegion = m_regionList.first(); |
| if (!firstRegion) |
| return; |
| if (style().writingMode() == firstRegion->style().writingMode()) |
| return; |
| |
| // The first region defines the principal writing mode for the entire flow. |
| auto newStyle = RenderStyle::clone(&style()); |
| newStyle.get().setWritingMode(firstRegion->style().writingMode()); |
| setStyle(std::move(newStyle)); |
| } |
| |
| RenderObject* RenderNamedFlowThread::nextRendererForNode(Node* node) const |
| { |
| for (auto it = m_flowThreadChildList->begin(), end = m_flowThreadChildList->end(); it != end; ++it) { |
| RenderObject* child = *it; |
| ASSERT(child->node()); |
| unsigned short position = node->compareDocumentPosition(child->node()); |
| if (position & Node::DOCUMENT_POSITION_FOLLOWING) |
| return child; |
| } |
| |
| return 0; |
| } |
| |
| RenderObject* RenderNamedFlowThread::previousRendererForNode(Node* node) const |
| { |
| if (m_flowThreadChildList->isEmpty()) |
| return 0; |
| |
| auto begin = m_flowThreadChildList->begin(); |
| auto end = m_flowThreadChildList->end(); |
| auto it = end; |
| |
| do { |
| --it; |
| RenderObject* child = *it; |
| ASSERT(child->node()); |
| unsigned short position = node->compareDocumentPosition(child->node()); |
| if (position & Node::DOCUMENT_POSITION_PRECEDING) |
| return child; |
| } while (it != begin); |
| |
| return 0; |
| } |
| |
| void RenderNamedFlowThread::addFlowChild(RenderObject* newChild) |
| { |
| // The child list is used to sort the flow thread's children render objects |
| // based on their corresponding nodes DOM order. The list is needed to avoid searching the whole DOM. |
| |
| Node* childNode = newChild->node(); |
| |
| // Do not add anonymous objects. |
| if (!childNode) |
| return; |
| |
| ASSERT(childNode->isElementNode()); |
| |
| RenderObject* beforeChild = nextRendererForNode(childNode); |
| if (beforeChild) |
| m_flowThreadChildList->insertBefore(beforeChild, newChild); |
| else |
| m_flowThreadChildList->add(newChild); |
| } |
| |
| void RenderNamedFlowThread::removeFlowChild(RenderObject* child) |
| { |
| m_flowThreadChildList->remove(child); |
| } |
| |
| bool RenderNamedFlowThread::dependsOn(RenderNamedFlowThread* otherRenderFlowThread) const |
| { |
| if (m_layoutBeforeThreadsSet.contains(otherRenderFlowThread)) |
| return true; |
| |
| // Recursively traverse the m_layoutBeforeThreadsSet. |
| for (auto iterator = m_layoutBeforeThreadsSet.begin(), end = m_layoutBeforeThreadsSet.end(); iterator != end; ++iterator) { |
| const RenderNamedFlowThread* beforeFlowThread = (*iterator).key; |
| if (beforeFlowThread->dependsOn(otherRenderFlowThread)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| // Compare two regions to determine in which one the content should flow first. |
| // The function returns true if the first passed region is "less" than the second passed region. |
| // If the first region appears before second region in DOM, |
| // the first region is "less" than the second region. |
| // If the first region is "less" than the second region, the first region receives content before second region. |
| static bool compareRenderRegions(const RenderRegion* firstRegion, const RenderRegion* secondRegion) |
| { |
| ASSERT(firstRegion); |
| ASSERT(secondRegion); |
| |
| ASSERT(firstRegion->generatingElement()); |
| ASSERT(secondRegion->generatingElement()); |
| |
| // If the regions belong to different nodes, compare their position in the DOM. |
| if (firstRegion->generatingElement() != secondRegion->generatingElement()) { |
| unsigned short position = firstRegion->generatingElement()->compareDocumentPosition(secondRegion->generatingElement()); |
| |
| // If the second region is contained in the first one, the first region is "less" if it's :before. |
| if (position & Node::DOCUMENT_POSITION_CONTAINED_BY) { |
| ASSERT(secondRegion->style().styleType() == NOPSEUDO); |
| return firstRegion->style().styleType() == BEFORE; |
| } |
| |
| // If the second region contains the first region, the first region is "less" if the second is :after. |
| if (position & Node::DOCUMENT_POSITION_CONTAINS) { |
| ASSERT(firstRegion->style().styleType() == NOPSEUDO); |
| return secondRegion->style().styleType() == AFTER; |
| } |
| |
| return (position & Node::DOCUMENT_POSITION_FOLLOWING); |
| } |
| |
| // FIXME: Currently it's not possible for an element to be both a region and have pseudo-children. The case is covered anyway. |
| switch (firstRegion->style().styleType()) { |
| case BEFORE: |
| // The second region can be the node or the after pseudo-element (before is smaller than any of those). |
| return true; |
| case AFTER: |
| // The second region can be the node or the before pseudo-element (after is greater than any of those). |
| return false; |
| case NOPSEUDO: |
| // The second region can either be the before or the after pseudo-element (the node is only smaller than the after pseudo-element). |
| return firstRegion->style().styleType() == AFTER; |
| default: |
| break; |
| } |
| |
| ASSERT_NOT_REACHED(); |
| return true; |
| } |
| |
| // This helper function adds a region to a list preserving the order property of the list. |
| static void addRegionToList(RenderRegionList& regionList, RenderRegion* renderRegion) |
| { |
| if (regionList.isEmpty()) |
| regionList.add(renderRegion); |
| else { |
| // Find the first region "greater" than renderRegion. |
| auto it = regionList.begin(); |
| while (it != regionList.end() && !compareRenderRegions(renderRegion, *it)) |
| ++it; |
| regionList.insertBefore(it, renderRegion); |
| } |
| } |
| |
| void RenderNamedFlowThread::addRegionToNamedFlowThread(RenderRegion* renderRegion) |
| { |
| ASSERT(renderRegion); |
| ASSERT(!renderRegion->isValid()); |
| |
| if (renderRegion->parentNamedFlowThread()) |
| addDependencyOnFlowThread(renderRegion->parentNamedFlowThread()); |
| |
| renderRegion->setIsValid(true); |
| addRegionToList(m_regionList, renderRegion); |
| |
| if (m_regionList.first() == renderRegion) |
| updateWritingMode(); |
| } |
| |
| void RenderNamedFlowThread::addRegionToThread(RenderRegion* renderRegion) |
| { |
| ASSERT(renderRegion); |
| ASSERT(!renderRegion->isValid()); |
| |
| resetMarkForDestruction(); |
| |
| if (renderRegion->parentNamedFlowThread() && renderRegion->parentNamedFlowThread()->dependsOn(this)) { |
| // The order of invalid regions is irrelevant. |
| m_invalidRegionList.add(renderRegion); |
| // Register ourself to get a notification when the state changes. |
| renderRegion->parentNamedFlowThread()->m_observerThreadsSet.add(this); |
| return; |
| } |
| |
| addRegionToNamedFlowThread(renderRegion); |
| |
| invalidateRegions(); |
| } |
| |
| void RenderNamedFlowThread::removeRegionFromThread(RenderRegion* renderRegion) |
| { |
| ASSERT(renderRegion); |
| |
| if (renderRegion->parentNamedFlowThread()) { |
| if (!renderRegion->isValid()) { |
| ASSERT(m_invalidRegionList.contains(renderRegion)); |
| m_invalidRegionList.remove(renderRegion); |
| renderRegion->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(renderRegion->parentNamedFlowThread()); |
| } |
| |
| ASSERT(m_regionList.contains(renderRegion)); |
| bool wasFirst = m_regionList.first() == renderRegion; |
| m_regionList.remove(renderRegion); |
| |
| if (canBeDestroyed()) |
| setMarkForDestruction(); |
| |
| // After removing all the regions in the flow the following layout needs to dispatch the regionLayoutUpdate event |
| if (m_regionList.isEmpty()) |
| setDispatchRegionLayoutUpdateEvent(true); |
| else if (wasFirst) |
| updateWritingMode(); |
| |
| invalidateRegions(); |
| } |
| |
| void RenderNamedFlowThread::regionChangedWritingMode(RenderRegion* region) |
| { |
| if (m_regionList.first() == region) |
| updateWritingMode(); |
| } |
| |
| void RenderNamedFlowThread::computeOversetStateForRegions(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 RenderNamedFlowThread (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 (auto iter = m_regionList.begin(), end = m_regionList.end(); iter != end; ++iter) { |
| RenderRegion* region = *iter; |
| LayoutUnit flowMin = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().y() : region->flowThreadPortionRect().x()); |
| LayoutUnit flowMax = height - (isHorizontalWritingMode() ? region->flowThreadPortionRect().maxY() : region->flowThreadPortionRect().maxX()); |
| RegionOversetState previousState = region->regionOversetState(); |
| RegionOversetState state = RegionFit; |
| if (flowMin <= 0) |
| state = RegionEmpty; |
| if (flowMax > 0 && region == lastReg) |
| state = RegionOverset; |
| region->setRegionOversetState(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 == RegionFit |
| || state == RegionOverset) |
| setDispatchRegionLayoutUpdateEvent(true); |
| |
| if (previousState != state) |
| setDispatchRegionOversetChangeEvent(true); |
| } |
| |
| // If the number of regions has changed since we last computed the overset property, schedule the regionOversetChange event. |
| if (previousRegionCountChanged()) { |
| setDispatchRegionOversetChangeEvent(true); |
| updatePreviousRegionCount(); |
| } |
| |
| // 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->regionOversetState() == RegionOverset : true; |
| } |
| |
| void RenderNamedFlowThread::checkInvalidRegions() |
| { |
| Vector<RenderRegion*> newValidRegions; |
| for (auto iter = m_invalidRegionList.begin(), end = m_invalidRegionList.end(); iter != 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->parentNamedFlowThread()->dependsOn(this)) |
| continue; |
| |
| newValidRegions.append(region); |
| } |
| |
| for (auto iter = newValidRegions.begin(), end = newValidRegions.end(); iter != end; ++iter) { |
| RenderRegion* region = *iter; |
| m_invalidRegionList.remove(region); |
| region->parentNamedFlowThread()->m_observerThreadsSet.remove(this); |
| addRegionToNamedFlowThread(region); |
| } |
| |
| if (!newValidRegions.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 (size_t i = 0; i < observers.size(); ++i) { |
| RenderNamedFlowThread* flowThread = observers.at(i); |
| flowThread->checkInvalidRegions(); |
| } |
| } |
| |
| void RenderNamedFlowThread::addDependencyOnFlowThread(RenderNamedFlowThread* otherFlowThread) |
| { |
| RenderNamedFlowThreadCountedSet::AddResult result = m_layoutBeforeThreadsSet.add(otherFlowThread); |
| if (result.isNewEntry) { |
| // This is the first time we see this dependency. Make sure we recalculate all the dependencies. |
| view().flowThreadController().setIsRenderNamedFlowThreadOrderDirty(true); |
| } |
| } |
| |
| void RenderNamedFlowThread::removeDependencyOnFlowThread(RenderNamedFlowThread* otherFlowThread) |
| { |
| bool removed = m_layoutBeforeThreadsSet.remove(otherFlowThread); |
| if (removed) { |
| checkInvalidRegions(); |
| view().flowThreadController().setIsRenderNamedFlowThreadOrderDirty(true); |
| } |
| } |
| |
| void RenderNamedFlowThread::pushDependencies(RenderNamedFlowThreadList& list) |
| { |
| for (auto iter = m_layoutBeforeThreadsSet.begin(), end = m_layoutBeforeThreadsSet.end(); iter != end; ++iter) { |
| RenderNamedFlowThread* flowThread = (*iter).key; |
| if (list.contains(flowThread)) |
| continue; |
| flowThread->pushDependencies(list); |
| list.add(flowThread); |
| } |
| } |
| |
| // The content nodes list contains those nodes with -webkit-flow-into: flow. |
| // An element with display:none should also be listed among those nodes. |
| // The list of nodes is ordered. |
| void RenderNamedFlowThread::registerNamedFlowContentElement(Element& contentElement) |
| { |
| ASSERT(&contentElement.document() == &document()); |
| |
| contentElement.setInNamedFlow(); |
| |
| resetMarkForDestruction(); |
| |
| // Find the first content node following the new content node. |
| for (auto it = m_contentElements.begin(), end = m_contentElements.end(); it != end; ++it) { |
| Element* element = *it; |
| unsigned short position = contentElement.compareDocumentPosition(element); |
| if (position & Node::DOCUMENT_POSITION_FOLLOWING) { |
| m_contentElements.insertBefore(element, &contentElement); |
| InspectorInstrumentation::didRegisterNamedFlowContentElement(&document(), m_namedFlow.get(), &contentElement, element); |
| return; |
| } |
| } |
| |
| m_contentElements.add(&contentElement); |
| InspectorInstrumentation::didRegisterNamedFlowContentElement(&document(), m_namedFlow.get(), &contentElement); |
| } |
| |
| void RenderNamedFlowThread::unregisterNamedFlowContentElement(Element& contentElement) |
| { |
| ASSERT(m_contentElements.contains(&contentElement)); |
| ASSERT(contentElement.inNamedFlow()); |
| ASSERT(&contentElement.document() == &document()); |
| |
| contentElement.clearInNamedFlow(); |
| m_contentElements.remove(&contentElement); |
| |
| if (canBeDestroyed()) |
| setMarkForDestruction(); |
| |
| InspectorInstrumentation::didUnregisterNamedFlowContentElement(&document(), m_namedFlow.get(), &contentElement); |
| } |
| |
| bool RenderNamedFlowThread::hasContentElement(Element& contentElement) const |
| { |
| return m_contentElements.contains(&contentElement); |
| } |
| |
| const AtomicString& RenderNamedFlowThread::flowThreadName() const |
| { |
| return m_namedFlow->name(); |
| } |
| |
| bool RenderNamedFlowThread::isChildAllowed(const RenderObject& child, const RenderStyle& style) const |
| { |
| if (!child.node()) |
| return true; |
| |
| ASSERT(child.node()->isElementNode()); |
| |
| Node* originalParent = NodeRenderingTraversal::parent(child.node()); |
| if (!originalParent || !originalParent->isElementNode() || !originalParent->renderer()) |
| return true; |
| |
| return toElement(originalParent)->renderer()->isChildAllowed(child, style); |
| } |
| |
| void RenderNamedFlowThread::dispatchRegionLayoutUpdateEvent() |
| { |
| RenderFlowThread::dispatchRegionLayoutUpdateEvent(); |
| InspectorInstrumentation::didUpdateRegionLayout(&document(), m_namedFlow.get()); |
| |
| if (!m_regionLayoutUpdateEventTimer.isActive() && m_namedFlow->hasEventListeners()) |
| m_regionLayoutUpdateEventTimer.startOneShot(0); |
| } |
| |
| void RenderNamedFlowThread::dispatchRegionOversetChangeEvent() |
| { |
| RenderFlowThread::dispatchRegionOversetChangeEvent(); |
| InspectorInstrumentation::didChangeRegionOverset(&document(), m_namedFlow.get()); |
| |
| if (!m_regionOversetChangeEventTimer.isActive() && m_namedFlow->hasEventListeners()) |
| m_regionOversetChangeEventTimer.startOneShot(0); |
| } |
| |
| void RenderNamedFlowThread::regionLayoutUpdateEventTimerFired(Timer<RenderNamedFlowThread>*) |
| { |
| ASSERT(m_namedFlow); |
| |
| m_namedFlow->dispatchRegionLayoutUpdateEvent(); |
| } |
| |
| void RenderNamedFlowThread::regionOversetChangeEventTimerFired(Timer<RenderNamedFlowThread>*) |
| { |
| ASSERT(m_namedFlow); |
| |
| m_namedFlow->dispatchRegionOversetChangeEvent(); |
| } |
| |
| void RenderNamedFlowThread::setMarkForDestruction() |
| { |
| if (m_namedFlow->flowState() == WebKitNamedFlow::FlowStateNull) |
| return; |
| |
| m_namedFlow->setRenderer(0); |
| // After this call ends, the renderer can be safely destroyed. |
| // The NamedFlow object may outlive its renderer if it's referenced from a script and may be reatached to one if the named flow is recreated in the stylesheet. |
| } |
| |
| void RenderNamedFlowThread::resetMarkForDestruction() |
| { |
| if (m_namedFlow->flowState() == WebKitNamedFlow::FlowStateCreated) |
| return; |
| |
| m_namedFlow->setRenderer(this); |
| } |
| |
| bool RenderNamedFlowThread::isMarkedForDestruction() const |
| { |
| // Flow threads in the "NULL" state can be destroyed. |
| return m_namedFlow->flowState() == WebKitNamedFlow::FlowStateNull; |
| } |
| |
| static bool isContainedInElements(const Vector<Element*>& others, Element* element) |
| { |
| for (size_t i = 0; i < others.size(); i++) { |
| Element* other = others.at(i); |
| if (other->contains(element)) |
| return true; |
| } |
| return false; |
| } |
| |
| static bool boxIntersectsRegion(LayoutUnit logicalTopForBox, LayoutUnit logicalBottomForBox, LayoutUnit logicalTopForRegion, LayoutUnit logicalBottomForRegion) |
| { |
| bool regionIsEmpty = logicalBottomForRegion != LayoutUnit::max() && logicalTopForRegion != LayoutUnit::min() |
| && (logicalBottomForRegion - logicalTopForRegion) <= 0; |
| return (logicalBottomForBox - logicalTopForBox) > 0 |
| && !regionIsEmpty |
| && logicalTopForBox < logicalBottomForRegion && logicalTopForRegion < logicalBottomForBox; |
| } |
| |
| // Retrieve the next node to be visited while computing the ranges inside a region. |
| static Node* nextNodeInsideContentElement(const Node* currNode, const Element* contentElement) |
| { |
| ASSERT(currNode); |
| ASSERT(contentElement && contentElement->inNamedFlow()); |
| |
| #if ENABLE(SVG) |
| if (currNode->renderer() && currNode->renderer()->isSVGRoot()) |
| return NodeTraversal::nextSkippingChildren(currNode, contentElement); |
| #endif |
| return NodeTraversal::next(currNode, contentElement); |
| } |
| |
| void RenderNamedFlowThread::getRanges(Vector<RefPtr<Range>>& rangeObjects, const RenderRegion* region) const |
| { |
| LayoutUnit logicalTopForRegion; |
| LayoutUnit logicalBottomForRegion; |
| |
| // extend the first region top to contain everything up to its logical height |
| if (region->isFirstRegion()) |
| logicalTopForRegion = LayoutUnit::min(); |
| else |
| logicalTopForRegion = region->logicalTopForFlowThreadContent(); |
| |
| // extend the last region to contain everything above its y() |
| if (region->isLastRegion()) |
| logicalBottomForRegion = LayoutUnit::max(); |
| else |
| logicalBottomForRegion = region->logicalBottomForFlowThreadContent(); |
| |
| Vector<Element*> elements; |
| // eliminate the contentElements that are descendants of other contentElements |
| for (auto it = contentElements().begin(), end = contentElements().end(); it != end; ++it) { |
| Element* element = *it; |
| if (!isContainedInElements(elements, element)) |
| elements.append(element); |
| } |
| |
| for (size_t i = 0; i < elements.size(); i++) { |
| Element* contentElement = elements.at(i); |
| if (!contentElement->renderer()) |
| continue; |
| |
| RefPtr<Range> range = Range::create(contentElement->document()); |
| bool foundStartPosition = false; |
| bool startsAboveRegion = true; |
| bool endsBelowRegion = true; |
| bool skipOverOutsideNodes = false; |
| Node* lastEndNode = 0; |
| |
| for (Node* node = contentElement; node; node = nextNodeInsideContentElement(node, contentElement)) { |
| RenderObject* renderer = node->renderer(); |
| if (!renderer) |
| continue; |
| |
| LayoutRect boundingBox; |
| if (renderer->isRenderInline()) |
| boundingBox = toRenderInline(renderer)->linesBoundingBox(); |
| else if (renderer->isText()) |
| boundingBox = toRenderText(renderer)->linesBoundingBox(); |
| else { |
| boundingBox = toRenderBox(renderer)->frameRect(); |
| if (toRenderBox(renderer)->isRelPositioned()) |
| boundingBox.move(toRenderBox(renderer)->relativePositionLogicalOffset()); |
| } |
| |
| LayoutUnit offsetTop = renderer->containingBlock()->offsetFromLogicalTopOfFirstPage(); |
| const LayoutPoint logicalOffsetFromTop(isHorizontalWritingMode() ? LayoutUnit() : offsetTop, |
| isHorizontalWritingMode() ? offsetTop : LayoutUnit()); |
| |
| boundingBox.moveBy(logicalOffsetFromTop); |
| |
| LayoutUnit logicalTopForRenderer = region->logicalTopOfFlowThreadContentRect(boundingBox); |
| LayoutUnit logicalBottomForRenderer = region->logicalBottomOfFlowThreadContentRect(boundingBox); |
| |
| // if the bounding box of the current element doesn't intersect the region box |
| // close the current range only if the start element began inside the region, |
| // otherwise just move the start position after this node and keep skipping them until we found a proper start position. |
| if (!boxIntersectsRegion(logicalTopForRenderer, logicalBottomForRenderer, logicalTopForRegion, logicalBottomForRegion)) { |
| if (foundStartPosition) { |
| if (!startsAboveRegion) { |
| if (range->intersectsNode(node, IGNORE_EXCEPTION)) |
| range->setEndBefore(node, IGNORE_EXCEPTION); |
| rangeObjects.append(range->cloneRange(IGNORE_EXCEPTION)); |
| range = Range::create(contentElement->document()); |
| startsAboveRegion = true; |
| } else |
| skipOverOutsideNodes = true; |
| } |
| if (skipOverOutsideNodes) |
| range->setStartAfter(node, IGNORE_EXCEPTION); |
| foundStartPosition = false; |
| continue; |
| } |
| |
| // start position |
| if (logicalTopForRenderer < logicalTopForRegion && startsAboveRegion) { |
| if (renderer->isText()) { // Text crosses region top |
| // for Text elements, just find the last textbox that is contained inside the region and use its start() offset as start position |
| RenderText* textRenderer = toRenderText(renderer); |
| for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) { |
| if (offsetTop + box->logicalBottom() < logicalTopForRegion) |
| continue; |
| range->setStart(Position(toText(node), box->start())); |
| startsAboveRegion = false; |
| break; |
| } |
| } else { // node crosses region top |
| // for all elements, except Text, just set the start position to be before their children |
| startsAboveRegion = true; |
| range->setStart(Position(node, Position::PositionIsBeforeChildren)); |
| } |
| } else { // node starts inside region |
| // for elements that start inside the region, set the start position to be before them. If we found one, we will just skip the others until |
| // the range is closed. |
| if (startsAboveRegion) { |
| startsAboveRegion = false; |
| range->setStartBefore(node, IGNORE_EXCEPTION); |
| } |
| } |
| skipOverOutsideNodes = false; |
| foundStartPosition = true; |
| |
| // end position |
| if (logicalBottomForRegion < logicalBottomForRenderer && (endsBelowRegion || (!endsBelowRegion && !node->isDescendantOf(lastEndNode)))) { |
| // for Text elements, just find just find the last textbox that is contained inside the region and use its start()+len() offset as end position |
| if (renderer->isText()) { // Text crosses region bottom |
| RenderText* textRenderer = toRenderText(renderer); |
| InlineTextBox* lastBox = 0; |
| for (InlineTextBox* box = textRenderer->firstTextBox(); box; box = box->nextTextBox()) { |
| if ((offsetTop + box->logicalTop()) < logicalBottomForRegion) { |
| lastBox = box; |
| continue; |
| } |
| ASSERT(lastBox); |
| if (lastBox) |
| range->setEnd(Position(toText(node), lastBox->start() + lastBox->len())); |
| break; |
| } |
| endsBelowRegion = false; |
| lastEndNode = node; |
| } else { // node crosses region bottom |
| // for all elements, except Text, just set the start position to be after their children |
| range->setEnd(Position(node, Position::PositionIsAfterChildren)); |
| endsBelowRegion = true; |
| lastEndNode = node; |
| } |
| } else { // node ends inside region |
| // for elements that ends inside the region, set the end position to be after them |
| // allow this end position to be changed only by other elements that are not descendants of the current end node |
| if (endsBelowRegion || (!endsBelowRegion && !node->isDescendantOf(lastEndNode))) { |
| range->setEndAfter(node, IGNORE_EXCEPTION); |
| endsBelowRegion = false; |
| lastEndNode = node; |
| } |
| } |
| } |
| if (foundStartPosition || skipOverOutsideNodes) |
| rangeObjects.append(range); |
| } |
| } |
| |
| #if USE(ACCELERATED_COMPOSITING) |
| bool RenderNamedFlowThread::collectsGraphicsLayersUnderRegions() const |
| { |
| // We only need to map layers to regions for named flow threads. |
| // Multi-column threads are displayed on top of the regions and do not require |
| // distributing the layers. |
| |
| return true; |
| } |
| #endif |
| |
| // Check if the content is flown into at least a region with region styling rules. |
| void RenderNamedFlowThread::checkRegionsWithStyling() |
| { |
| bool hasRegionsWithStyling = false; |
| for (auto iter = m_regionList.begin(), end = m_regionList.end(); iter != end; ++iter) { |
| RenderNamedFlowFragment* region = toRenderNamedFlowFragment(*iter); |
| if (region->hasCustomRegionStyle()) { |
| hasRegionsWithStyling = true; |
| break; |
| } |
| } |
| m_hasRegionsWithStyling = hasRegionsWithStyling; |
| } |
| |
| void RenderNamedFlowThread::clearRenderObjectCustomStyle(const RenderObject* object) |
| { |
| // Clear the styles for the object in the regions. |
| // FIXME: Region styling is not computed only for the region range of the object so this is why we need to walk the whole chain. |
| for (auto iter = m_regionList.begin(), end = m_regionList.end(); iter != end; ++iter) { |
| RenderNamedFlowFragment* region = toRenderNamedFlowFragment(*iter); |
| region->clearObjectStyleInRegion(object); |
| } |
| } |
| |
| void RenderNamedFlowThread::removeFlowChildInfo(RenderObject* child) |
| { |
| RenderFlowThread::removeFlowChildInfo(child); |
| clearRenderObjectCustomStyle(child); |
| } |
| |
| } |
