| /** |
| * Copyright (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com) |
| * Copyright (C) 2006, 2007 Apple Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #include "core/layout/LayoutCounter.h" |
| |
| #include <memory> |
| #include "core/HTMLNames.h" |
| #include "core/dom/Element.h" |
| #include "core/dom/ElementTraversal.h" |
| #include "core/dom/PseudoElement.h" |
| #include "core/html/HTMLOListElement.h" |
| #include "core/layout/CounterNode.h" |
| #include "core/layout/LayoutListItem.h" |
| #include "core/layout/LayoutView.h" |
| #include "core/layout/ListMarkerText.h" |
| #include "core/style/ComputedStyle.h" |
| #include "wtf/PtrUtil.h" |
| #include "wtf/StdLibExtras.h" |
| |
| #ifndef NDEBUG |
| #include <stdio.h> |
| #endif |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| typedef HashMap<AtomicString, RefPtr<CounterNode>> CounterMap; |
| typedef HashMap<const LayoutObject*, std::unique_ptr<CounterMap>> CounterMaps; |
| |
| static CounterNode* makeCounterNodeIfNeeded(LayoutObject&, |
| const AtomicString& identifier, |
| bool alwaysCreateCounter); |
| |
| // See class definition as to why we have this map. |
| static CounterMaps& counterMaps() { |
| DEFINE_STATIC_LOCAL(CounterMaps, staticCounterMaps, ()); |
| return staticCounterMaps; |
| } |
| |
| Element* ancestorStyleContainmentObject(const Element& element) { |
| for (Element* ancestor = FlatTreeTraversal::parentElement(element); ancestor; |
| ancestor = FlatTreeTraversal::parentElement(*ancestor)) { |
| if (ancestor->layoutObject() && |
| ancestor->layoutObject()->style()->containsStyle()) |
| return ancestor; |
| } |
| return nullptr; |
| } |
| |
| // This function processes the layoutObject tree in the order of the DOM tree |
| // including pseudo elements as defined in CSS 2.1. This method will always |
| // return either a previous object within the same contain: style scope or |
| // nullptr. |
| static LayoutObject* previousInPreOrderRespectingContainment( |
| const LayoutObject& object) { |
| Element* self = toElement(object.node()); |
| ASSERT(self); |
| Element* previous = ElementTraversal::previousIncludingPseudo(*self); |
| Element* styleContainAncestor = ancestorStyleContainmentObject(*self); |
| |
| while (1) { |
| while (previous && !previous->layoutObject()) |
| previous = ElementTraversal::previousIncludingPseudo(*previous); |
| if (!previous) |
| return nullptr; |
| Element* previousStyleContainAncestor = |
| ancestorStyleContainmentObject(*previous); |
| if (previousStyleContainAncestor == styleContainAncestor) |
| return previous->layoutObject(); |
| if (!previousStyleContainAncestor) |
| return nullptr; |
| previous = previousStyleContainAncestor; |
| } |
| } |
| |
| // This function processes the layoutObject tree in the order of the DOM tree |
| // including pseudo elements as defined in CSS 2.1. This method avoids crossing |
| // contain: style boundaries. |
| static LayoutObject* previousSiblingOrParentRespectingContainment( |
| const LayoutObject& object) { |
| Element* self = toElement(object.node()); |
| ASSERT(self); |
| Element* previous = ElementTraversal::pseudoAwarePreviousSibling(*self); |
| while (previous && !previous->layoutObject()) |
| previous = ElementTraversal::pseudoAwarePreviousSibling(*previous); |
| if (previous) |
| return previous->layoutObject(); |
| previous = self->parentElement(); |
| return previous && previous->layoutObject() && |
| !(previous->layoutObject()->style()->contain() & ContainsStyle) |
| ? previous->layoutObject() |
| : nullptr; |
| } |
| |
| static inline Element* parentElement(LayoutObject& object) { |
| return toElement(object.node())->parentElement(); |
| } |
| |
| static inline bool areLayoutObjectsElementsSiblings(LayoutObject& first, |
| LayoutObject& second) { |
| return parentElement(first) == parentElement(second); |
| } |
| |
| // This function processes the layoutObject tree in the order of the DOM tree |
| // including pseudo elements as defined in CSS 2.1. |
| static LayoutObject* nextInPreOrder(const LayoutObject& object, |
| const Element* stayWithin, |
| bool skipDescendants = false) { |
| Element* self = toElement(object.node()); |
| ASSERT(self); |
| Element* next = |
| skipDescendants |
| ? ElementTraversal::nextIncludingPseudoSkippingChildren(*self, |
| stayWithin) |
| : ElementTraversal::nextIncludingPseudo(*self, stayWithin); |
| while (next && !next->layoutObject()) |
| next = skipDescendants |
| ? ElementTraversal::nextIncludingPseudoSkippingChildren( |
| *next, stayWithin) |
| : ElementTraversal::nextIncludingPseudo(*next, stayWithin); |
| return next ? next->layoutObject() : nullptr; |
| } |
| |
| static bool planCounter(LayoutObject& object, |
| const AtomicString& identifier, |
| bool& isReset, |
| int& value) { |
| // Real text nodes don't have their own style so they can't have counters. |
| // We can't even look at their styles or we'll see extra resets and |
| // increments! |
| if (object.isText() && !object.isBR()) |
| return false; |
| Node* generatingNode = object.generatingNode(); |
| // We must have a generating node or else we cannot have a counter. |
| if (!generatingNode) |
| return false; |
| const ComputedStyle& style = object.styleRef(); |
| |
| switch (style.styleType()) { |
| case PseudoIdNone: |
| // Sometimes nodes have more than one layoutObject. Only the first one |
| // gets the counter. See LayoutTests/http/tests/css/counter-crash.html |
| if (generatingNode->layoutObject() != &object) |
| return false; |
| break; |
| case PseudoIdBefore: |
| case PseudoIdAfter: |
| break; |
| default: |
| return false; // Counters are forbidden from all other pseudo elements. |
| } |
| |
| const CounterDirectives directives = style.getCounterDirectives(identifier); |
| if (directives.isDefined()) { |
| value = directives.combinedValue(); |
| isReset = directives.isReset(); |
| return true; |
| } |
| |
| if (identifier == "list-item") { |
| if (object.isListItem()) { |
| if (toLayoutListItem(object).hasExplicitValue()) { |
| value = toLayoutListItem(object).explicitValue(); |
| isReset = true; |
| return true; |
| } |
| value = 1; |
| isReset = false; |
| return true; |
| } |
| if (Node* e = object.node()) { |
| if (isHTMLOListElement(*e)) { |
| value = toHTMLOListElement(e)->start(); |
| isReset = true; |
| return true; |
| } |
| if (isHTMLUListElement(*e) || isHTMLMenuElement(*e) || |
| isHTMLDirectoryElement(*e)) { |
| value = 0; |
| isReset = true; |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| // - Finds the insertion point for the counter described by counterOwner, |
| // isReset and identifier in the CounterNode tree for identifier and sets |
| // parent and previousSibling accordingly. |
| // - The function returns true if the counter whose insertion point is searched |
| // is NOT the root of the tree. |
| // - The root of the tree is a counter reference that is not in the scope of any |
| // other counter with the same identifier. |
| // - All the counter references with the same identifier as this one that are in |
| // children or subsequent siblings of the layoutObject that owns the root of |
| // the tree form the rest of of the nodes of the tree. |
| // - The root of the tree is always a reset type reference. |
| // - A subtree rooted at any reset node in the tree is equivalent to all counter |
| // references that are in the scope of the counter or nested counter defined |
| // by that reset node. |
| // - Non-reset CounterNodes cannot have descendants. |
| static bool findPlaceForCounter(LayoutObject& counterOwner, |
| const AtomicString& identifier, |
| bool isReset, |
| RefPtr<CounterNode>& parent, |
| RefPtr<CounterNode>& previousSibling) { |
| // We cannot stop searching for counters with the same identifier before we |
| // also check this layoutObject, because it may affect the positioning in the |
| // tree of our counter. |
| LayoutObject* searchEndLayoutObject = |
| previousSiblingOrParentRespectingContainment(counterOwner); |
| // We check layoutObjects in preOrder from the layoutObject that our counter |
| // is attached to towards the beginning of the document for counters with the |
| // same identifier as the one we are trying to find a place for. This is the |
| // next layoutObject to be checked. |
| LayoutObject* currentLayoutObject = |
| previousInPreOrderRespectingContainment(counterOwner); |
| previousSibling = nullptr; |
| RefPtr<CounterNode> previousSiblingProtector = nullptr; |
| |
| while (currentLayoutObject) { |
| CounterNode* currentCounter = |
| makeCounterNodeIfNeeded(*currentLayoutObject, identifier, false); |
| if (searchEndLayoutObject == currentLayoutObject) { |
| // We may be at the end of our search. |
| if (currentCounter) { |
| // We have a suitable counter on the EndSearchLayoutObject. |
| if (previousSiblingProtector) { |
| // But we already found another counter that we come after. |
| if (currentCounter->actsAsReset()) { |
| // We found a reset counter that is on a layoutObject that is a |
| // sibling of ours or a parent. |
| if (isReset && areLayoutObjectsElementsSiblings( |
| *currentLayoutObject, counterOwner)) { |
| // We are also a reset counter and the previous reset was on a |
| // sibling layoutObject hence we are the next sibling of that |
| // counter if that reset is not a root or we are a root node if |
| // that reset is a root. |
| parent = currentCounter->parent(); |
| previousSibling = parent ? currentCounter : nullptr; |
| return parent.get(); |
| } |
| // We are not a reset node or the previous reset must be on an |
| // ancestor of our owner layoutObject hence we must be a child of |
| // that reset counter. |
| parent = currentCounter; |
| // In some cases layoutObjects can be reparented (ex. nodes inside a |
| // table but not in a column or row). In these cases the identified |
| // previousSibling will be invalid as its parent is different from |
| // our identified parent. |
| if (previousSiblingProtector->parent() != currentCounter) |
| previousSiblingProtector = nullptr; |
| |
| previousSibling = previousSiblingProtector.get(); |
| return true; |
| } |
| // CurrentCounter, the counter at the EndSearchLayoutObject, is not |
| // reset. |
| if (!isReset || |
| !areLayoutObjectsElementsSiblings(*currentLayoutObject, |
| counterOwner)) { |
| // If the node we are placing is not reset or we have found a |
| // counter that is attached to an ancestor of the placed counter's |
| // owner layoutObject we know we are a sibling of that node. |
| if (currentCounter->parent() != previousSiblingProtector->parent()) |
| return false; |
| |
| parent = currentCounter->parent(); |
| previousSibling = previousSiblingProtector.get(); |
| return true; |
| } |
| } else { |
| // We are at the potential end of the search, but we had no previous |
| // sibling candidate. In this case we follow pretty much the same |
| // logic as above but no ASSERTs about previousSibling, and when we |
| // are a sibling of the end counter we must set previousSibling to |
| // currentCounter. |
| if (currentCounter->actsAsReset()) { |
| if (isReset && areLayoutObjectsElementsSiblings( |
| *currentLayoutObject, counterOwner)) { |
| parent = currentCounter->parent(); |
| previousSibling = currentCounter; |
| return parent.get(); |
| } |
| parent = currentCounter; |
| previousSibling = previousSiblingProtector.get(); |
| return true; |
| } |
| if (!isReset || |
| !areLayoutObjectsElementsSiblings(*currentLayoutObject, |
| counterOwner)) { |
| parent = currentCounter->parent(); |
| previousSibling = currentCounter; |
| return true; |
| } |
| previousSiblingProtector = currentCounter; |
| } |
| } |
| // We come here if the previous sibling or parent of our owner |
| // layoutObject had no good counter, or we are a reset node and the |
| // counter on the previous sibling of our owner layoutObject was not a |
| // reset counter. Set a new goal for the end of the search. |
| searchEndLayoutObject = |
| previousSiblingOrParentRespectingContainment(*currentLayoutObject); |
| } else { |
| // We are searching descendants of a previous sibling of the layoutObject |
| // that the |
| // counter being placed is attached to. |
| if (currentCounter) { |
| // We found a suitable counter. |
| if (previousSiblingProtector) { |
| // Since we had a suitable previous counter before, we should only |
| // consider this one as our previousSibling if it is a reset counter |
| // and hence the current previousSibling is its child. |
| if (currentCounter->actsAsReset()) { |
| previousSiblingProtector = currentCounter; |
| // We are no longer interested in previous siblings of the |
| // currentLayoutObject or their children as counters they may have |
| // attached cannot be the previous sibling of the counter we are |
| // placing. |
| Element* parent = parentElement(*currentLayoutObject); |
| currentLayoutObject = parent ? parent->layoutObject() : nullptr; |
| continue; |
| } |
| } else { |
| previousSiblingProtector = currentCounter; |
| } |
| currentLayoutObject = |
| previousSiblingOrParentRespectingContainment(*currentLayoutObject); |
| continue; |
| } |
| } |
| // This function is designed so that the same test is not done twice in an |
| // iteration, except for this one which may be done twice in some cases. |
| // Rearranging the decision points though, to accommodate this performance |
| // improvement would create more code duplication than is worthwhile in my |
| // opinion and may further impede the readability of this already complex |
| // algorithm. |
| if (previousSiblingProtector) |
| currentLayoutObject = |
| previousSiblingOrParentRespectingContainment(*currentLayoutObject); |
| else |
| currentLayoutObject = |
| previousInPreOrderRespectingContainment(*currentLayoutObject); |
| } |
| return false; |
| } |
| |
| static CounterNode* makeCounterNodeIfNeeded(LayoutObject& object, |
| const AtomicString& identifier, |
| bool alwaysCreateCounter) { |
| if (object.hasCounterNodeMap()) { |
| if (CounterMap* nodeMap = counterMaps().at(&object)) { |
| if (CounterNode* node = nodeMap->at(identifier)) |
| return node; |
| } |
| } |
| |
| bool isReset = false; |
| int value = 0; |
| if (!planCounter(object, identifier, isReset, value) && !alwaysCreateCounter) |
| return nullptr; |
| |
| RefPtr<CounterNode> newParent = nullptr; |
| RefPtr<CounterNode> newPreviousSibling = nullptr; |
| RefPtr<CounterNode> newNode = CounterNode::create(object, isReset, value); |
| if (findPlaceForCounter(object, identifier, isReset, newParent, |
| newPreviousSibling)) |
| newParent->insertAfter(newNode.get(), newPreviousSibling.get(), identifier); |
| CounterMap* nodeMap; |
| if (object.hasCounterNodeMap()) { |
| nodeMap = counterMaps().at(&object); |
| } else { |
| nodeMap = new CounterMap; |
| counterMaps().set(&object, WTF::wrapUnique(nodeMap)); |
| object.setHasCounterNodeMap(true); |
| } |
| nodeMap->set(identifier, newNode); |
| if (newNode->parent()) |
| return newNode.get(); |
| // Checking if some nodes that were previously counter tree root nodes |
| // should become children of this node now. |
| CounterMaps& maps = counterMaps(); |
| Element* stayWithin = parentElement(object); |
| bool skipDescendants; |
| for (LayoutObject* currentLayoutObject = nextInPreOrder(object, stayWithin); |
| currentLayoutObject; |
| currentLayoutObject = |
| nextInPreOrder(*currentLayoutObject, stayWithin, skipDescendants)) { |
| skipDescendants = false; |
| if (!currentLayoutObject->hasCounterNodeMap()) |
| continue; |
| CounterNode* currentCounter = maps.at(currentLayoutObject)->at(identifier); |
| if (!currentCounter) |
| continue; |
| skipDescendants = true; |
| if (currentCounter->parent()) |
| continue; |
| if (stayWithin == parentElement(*currentLayoutObject) && |
| currentCounter->hasResetType()) |
| break; |
| newNode->insertAfter(currentCounter, newNode->lastChild(), identifier); |
| } |
| return newNode.get(); |
| } |
| |
| LayoutCounter::LayoutCounter(PseudoElement& pseudo, |
| const CounterContent& counter) |
| : LayoutText(nullptr, StringImpl::empty), |
| m_counter(counter), |
| m_counterNode(nullptr), |
| m_nextForSameCounter(nullptr) { |
| setDocumentForAnonymous(&pseudo.document()); |
| view()->addLayoutCounter(); |
| } |
| |
| LayoutCounter::~LayoutCounter() {} |
| |
| void LayoutCounter::willBeDestroyed() { |
| if (m_counterNode) { |
| m_counterNode->removeLayoutObject(this); |
| ASSERT(!m_counterNode); |
| } |
| if (view()) |
| view()->removeLayoutCounter(); |
| LayoutText::willBeDestroyed(); |
| } |
| |
| PassRefPtr<StringImpl> LayoutCounter::originalText() const { |
| if (!m_counterNode) { |
| LayoutObject* beforeAfterContainer = parent(); |
| while (true) { |
| if (!beforeAfterContainer) |
| return nullptr; |
| if (!beforeAfterContainer->isAnonymous() && |
| !beforeAfterContainer->isPseudoElement()) |
| return nullptr; // LayoutCounters are restricted to before and after |
| // pseudo elements |
| PseudoId containerStyle = beforeAfterContainer->style()->styleType(); |
| if ((containerStyle == PseudoIdBefore) || |
| (containerStyle == PseudoIdAfter)) |
| break; |
| beforeAfterContainer = beforeAfterContainer->parent(); |
| } |
| makeCounterNodeIfNeeded(*beforeAfterContainer, m_counter.identifier(), true) |
| ->addLayoutObject(const_cast<LayoutCounter*>(this)); |
| ASSERT(m_counterNode); |
| } |
| CounterNode* child = m_counterNode; |
| int value = child->actsAsReset() ? child->value() : child->countInParent(); |
| |
| String text = ListMarkerText::text(m_counter.listStyle(), value); |
| |
| if (!m_counter.separator().isNull()) { |
| if (!child->actsAsReset()) |
| child = child->parent(); |
| while (CounterNode* parent = child->parent()) { |
| text = |
| ListMarkerText::text(m_counter.listStyle(), child->countInParent()) + |
| m_counter.separator() + text; |
| child = parent; |
| } |
| } |
| |
| return text.impl(); |
| } |
| |
| void LayoutCounter::updateCounter() { |
| setText(originalText()); |
| } |
| |
| void LayoutCounter::invalidate() { |
| m_counterNode->removeLayoutObject(this); |
| ASSERT(!m_counterNode); |
| if (documentBeingDestroyed()) |
| return; |
| setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation( |
| LayoutInvalidationReason::CountersChanged); |
| } |
| |
| static void destroyCounterNodeWithoutMapRemoval(const AtomicString& identifier, |
| CounterNode* node) { |
| CounterNode* previous; |
| for (RefPtr<CounterNode> child = node->lastDescendant(); |
| child && child != node; child = previous) { |
| previous = child->previousInPreOrder(); |
| child->parent()->removeChild(child.get()); |
| ASSERT(counterMaps().at(&child->owner())->at(identifier) == child); |
| counterMaps().at(&child->owner())->erase(identifier); |
| } |
| if (CounterNode* parent = node->parent()) |
| parent->removeChild(node); |
| } |
| |
| void LayoutCounter::destroyCounterNodes(LayoutObject& owner) { |
| CounterMaps& maps = counterMaps(); |
| CounterMaps::iterator mapsIterator = maps.find(&owner); |
| if (mapsIterator == maps.end()) |
| return; |
| CounterMap* map = mapsIterator->value.get(); |
| CounterMap::const_iterator end = map->end(); |
| for (CounterMap::const_iterator it = map->begin(); it != end; ++it) { |
| destroyCounterNodeWithoutMapRemoval(it->key, it->value.get()); |
| } |
| maps.remove(mapsIterator); |
| owner.setHasCounterNodeMap(false); |
| } |
| |
| void LayoutCounter::destroyCounterNode(LayoutObject& owner, |
| const AtomicString& identifier) { |
| CounterMap* map = counterMaps().at(&owner); |
| if (!map) |
| return; |
| CounterMap::iterator mapIterator = map->find(identifier); |
| if (mapIterator == map->end()) |
| return; |
| destroyCounterNodeWithoutMapRemoval(identifier, mapIterator->value.get()); |
| map->remove(mapIterator); |
| // We do not delete "map" here even if empty because we expect to reuse |
| // it soon. In order for a layoutObject to lose all its counters permanently, |
| // a style change for the layoutObject involving removal of all counter |
| // directives must occur, in which case, LayoutCounter::destroyCounterNodes() |
| // must be called. |
| // The destruction of the LayoutObject (possibly caused by the removal of its |
| // associated DOM node) is the other case that leads to the permanent |
| // destruction of all counters attached to a LayoutObject. In this case |
| // LayoutCounter::destroyCounterNodes() must be and is now called, too. |
| // LayoutCounter::destroyCounterNodes() handles destruction of the counter |
| // map associated with a layoutObject, so there is no risk in leaking the map. |
| } |
| |
| void LayoutCounter::layoutObjectSubtreeWillBeDetached( |
| LayoutObject* layoutObject) { |
| ASSERT(layoutObject->view()); |
| // View should never be non-zero. crbug.com/546939 |
| if (!layoutObject->view() || !layoutObject->view()->hasLayoutCounters()) |
| return; |
| |
| LayoutObject* currentLayoutObject = layoutObject->lastLeafChild(); |
| if (!currentLayoutObject) |
| currentLayoutObject = layoutObject; |
| while (true) { |
| destroyCounterNodes(*currentLayoutObject); |
| if (currentLayoutObject == layoutObject) |
| break; |
| currentLayoutObject = currentLayoutObject->previousInPreOrder(); |
| } |
| } |
| |
| static void updateCounters(LayoutObject& layoutObject) { |
| ASSERT(layoutObject.style()); |
| const CounterDirectiveMap* directiveMap = |
| layoutObject.style()->counterDirectives(); |
| if (!directiveMap) |
| return; |
| CounterDirectiveMap::const_iterator end = directiveMap->end(); |
| if (!layoutObject.hasCounterNodeMap()) { |
| for (CounterDirectiveMap::const_iterator it = directiveMap->begin(); |
| it != end; ++it) |
| makeCounterNodeIfNeeded(layoutObject, it->key, false); |
| return; |
| } |
| CounterMap* counterMap = counterMaps().at(&layoutObject); |
| ASSERT(counterMap); |
| for (CounterDirectiveMap::const_iterator it = directiveMap->begin(); |
| it != end; ++it) { |
| RefPtr<CounterNode> node = counterMap->at(it->key); |
| if (!node) { |
| makeCounterNodeIfNeeded(layoutObject, it->key, false); |
| continue; |
| } |
| RefPtr<CounterNode> newParent = nullptr; |
| RefPtr<CounterNode> newPreviousSibling = nullptr; |
| |
| findPlaceForCounter(layoutObject, it->key, node->hasResetType(), newParent, |
| newPreviousSibling); |
| if (node != counterMap->at(it->key)) |
| continue; |
| CounterNode* parent = node->parent(); |
| if (newParent == parent && newPreviousSibling == node->previousSibling()) |
| continue; |
| if (parent) |
| parent->removeChild(node.get()); |
| if (newParent) |
| newParent->insertAfter(node.get(), newPreviousSibling.get(), it->key); |
| } |
| } |
| |
| void LayoutCounter::layoutObjectSubtreeAttached(LayoutObject* layoutObject) { |
| ASSERT(layoutObject->view()); |
| if (!layoutObject->view()->hasLayoutCounters()) |
| return; |
| Node* node = layoutObject->node(); |
| if (node) |
| node = node->parentNode(); |
| else |
| node = layoutObject->generatingNode(); |
| if (node && node->needsAttach()) |
| return; // No need to update if the parent is not attached yet |
| for (LayoutObject* descendant = layoutObject; descendant; |
| descendant = descendant->nextInPreOrder(layoutObject)) |
| updateCounters(*descendant); |
| } |
| |
| void LayoutCounter::layoutObjectStyleChanged(LayoutObject& layoutObject, |
| const ComputedStyle* oldStyle, |
| const ComputedStyle& newStyle) { |
| Node* node = layoutObject.generatingNode(); |
| if (!node || node->needsAttach()) |
| return; // cannot have generated content or if it can have, it will be |
| // handled during attaching |
| const CounterDirectiveMap* oldCounterDirectives = |
| oldStyle ? oldStyle->counterDirectives() : 0; |
| const CounterDirectiveMap* newCounterDirectives = |
| newStyle.counterDirectives(); |
| if (oldCounterDirectives) { |
| if (newCounterDirectives) { |
| CounterDirectiveMap::const_iterator newMapEnd = |
| newCounterDirectives->end(); |
| CounterDirectiveMap::const_iterator oldMapEnd = |
| oldCounterDirectives->end(); |
| for (CounterDirectiveMap::const_iterator it = |
| newCounterDirectives->begin(); |
| it != newMapEnd; ++it) { |
| CounterDirectiveMap::const_iterator oldMapIt = |
| oldCounterDirectives->find(it->key); |
| if (oldMapIt != oldMapEnd) { |
| if (oldMapIt->value == it->value) |
| continue; |
| LayoutCounter::destroyCounterNode(layoutObject, it->key); |
| } |
| // We must create this node here, because the changed node may be a node |
| // with no display such as as those created by the increment or reset |
| // directives and the re-layout that will happen will not catch the |
| // change if the node had no children. |
| makeCounterNodeIfNeeded(layoutObject, it->key, false); |
| } |
| // Destroying old counters that do not exist in the new counterDirective |
| // map. |
| for (CounterDirectiveMap::const_iterator it = |
| oldCounterDirectives->begin(); |
| it != oldMapEnd; ++it) { |
| if (!newCounterDirectives->contains(it->key)) |
| LayoutCounter::destroyCounterNode(layoutObject, it->key); |
| } |
| } else { |
| if (layoutObject.hasCounterNodeMap()) |
| LayoutCounter::destroyCounterNodes(layoutObject); |
| } |
| } else if (newCounterDirectives) { |
| if (layoutObject.hasCounterNodeMap()) |
| LayoutCounter::destroyCounterNodes(layoutObject); |
| CounterDirectiveMap::const_iterator newMapEnd = newCounterDirectives->end(); |
| for (CounterDirectiveMap::const_iterator it = newCounterDirectives->begin(); |
| it != newMapEnd; ++it) { |
| // We must create this node here, because the added node may be a node |
| // with no display such as as those created by the increment or reset |
| // directives and the re-layout that will happen will not catch the change |
| // if the node had no children. |
| makeCounterNodeIfNeeded(layoutObject, it->key, false); |
| } |
| } |
| } |
| |
| } // namespace blink |
| |
| #ifndef NDEBUG |
| |
| void showCounterLayoutObjectTree(const blink::LayoutObject* layoutObject, |
| const char* counterName) { |
| if (!layoutObject) |
| return; |
| const blink::LayoutObject* root = layoutObject; |
| while (root->parent()) |
| root = root->parent(); |
| |
| AtomicString identifier(counterName); |
| for (const blink::LayoutObject* current = root; current; |
| current = current->nextInPreOrder()) { |
| fprintf(stderr, "%c", (current == layoutObject) ? '*' : ' '); |
| for (const blink::LayoutObject* parent = current; parent && parent != root; |
| parent = parent->parent()) |
| fprintf(stderr, " "); |
| fprintf(stderr, "%p N:%p P:%p PS:%p NS:%p C:%p\n", current, current->node(), |
| current->parent(), current->previousSibling(), |
| current->nextSibling(), |
| current->hasCounterNodeMap() |
| ? counterName ? blink::counterMaps().at(current)->at(identifier) |
| : (blink::CounterNode*)1 |
| : (blink::CounterNode*)0); |
| } |
| fflush(stderr); |
| } |
| |
| #endif // NDEBUG |
