C++ RenderObject::hasCounterNodeMap方法代码示例

static void updateCounters(RenderObject& renderer)
{
    ASSERT(renderer.style());
    const CounterDirectiveMap* directiveMap = renderer.style()->counterDirectives();
    if (!directiveMap)
        return;
    CounterDirectiveMap::const_iterator end = directiveMap->end();
    if (!renderer.hasCounterNodeMap()) {
        for (CounterDirectiveMap::const_iterator it = directiveMap->begin(); it != end; ++it)
            makeCounterNode(renderer, it->key, false);
        return;
    }
    CounterMap* counterMap = counterMaps().get(&renderer);
    ASSERT(counterMap);
    for (CounterDirectiveMap::const_iterator it = directiveMap->begin(); it != end; ++it) {
        RefPtr<CounterNode> node = counterMap->get(it->key);
        if (!node) {
            makeCounterNode(renderer, it->key, false);
            continue;
        }
        RefPtr<CounterNode> newParent = nullptr;
        RefPtr<CounterNode> newPreviousSibling = nullptr;

        findPlaceForCounter(renderer, it->key, node->hasResetType(), newParent, newPreviousSibling);
        if (node != counterMap->get(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);
    }
}

static CounterNode* makeCounterNode(RenderObject* object, const AtomicString& identifier, bool alwaysCreateCounter)
{
    ASSERT(object);

    if (object->hasCounterNodeMap()) {
        if (CounterMap* nodeMap = counterMaps().get(object)) {
            if (CounterNode* node = nodeMap->get(identifier).get())
                return node;
        }
    }

    bool isReset = false;
    int value = 0;
    if (!planCounter(object, identifier, isReset, value) && !alwaysCreateCounter)
        return 0;

    RefPtr<CounterNode> newParent = 0;
    RefPtr<CounterNode> newPreviousSibling = 0;
    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().get(object);
    else {
        nodeMap = new CounterMap;
        counterMaps().set(object, adoptPtr(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 (RenderObject* currentRenderer = nextInPreOrder(object, stayWithin); currentRenderer; currentRenderer = nextInPreOrder(currentRenderer, stayWithin, skipDescendants)) {
        skipDescendants = false;
        if (!currentRenderer->hasCounterNodeMap())
            continue;
        CounterNode* currentCounter = maps.get(currentRenderer)->get(identifier).get();
        if (!currentCounter)
            continue;
        skipDescendants = true;
        if (currentCounter->parent())
            continue;
        if (stayWithin == parentElement(currentRenderer) && currentCounter->hasResetType())
            break;
        newNode->insertAfter(currentCounter, newNode->lastChild(), identifier);
    }
    return newNode.get();
}

void RenderCounter::rendererStyleChanged(RenderObject& renderer, const RenderStyle* oldStyle, const RenderStyle* newStyle)
{
    Node* node = renderer.generatingNode();
    if (!node || node->needsAttach())
        return; // cannot have generated content or if it can have, it will be handled during attaching
    const CounterDirectiveMap* newCounterDirectives;
    const CounterDirectiveMap* oldCounterDirectives;
    if (oldStyle && (oldCounterDirectives = oldStyle->counterDirectives())) {
        if (newStyle && (newCounterDirectives = newStyle->counterDirectives())) {
            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;
                    RenderCounter::destroyCounterNode(renderer, 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.
                makeCounterNode(renderer, 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))
                    RenderCounter::destroyCounterNode(renderer, it->key);
            }
        } else {
            if (renderer.hasCounterNodeMap())
                RenderCounter::destroyCounterNodes(renderer);
        }
    } else if (newStyle && (newCounterDirectives = newStyle->counterDirectives())) {
        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.
            makeCounterNode(renderer, it->key, false);
        }
    }
}