C++ (Cpp) retargeter示例

示例#1

文件： EventDispatcher.cpp 项目： sailei1/webkit

void EventPath::setRelatedTarget(Node& origin, EventTarget& relatedTarget)
{
    UNUSED_PARAM(origin);
    Node* relatedNode = relatedTarget.toNode();
    if (!relatedNode || m_path.isEmpty())
        return;

    RelatedNodeRetargeter retargeter(*relatedNode, downcast<MouseOrFocusEventContext>(*m_path[0]).node()->treeScope());

    bool originIsRelatedTarget = &origin == relatedNode;
    // FIXME: We should add a new flag on Event instead.
    bool shouldTrimEventPath = m_event.type() == eventNames().mouseoverEvent
        || m_event.type() == eventNames().mousemoveEvent
        || m_event.type() == eventNames().mouseoutEvent;
    Node& rootNodeInOriginTreeScope = origin.treeScope().rootNode();
    TreeScope* previousTreeScope = nullptr;
    size_t originalEventPathSize = m_path.size();
    for (unsigned contextIndex = 0; contextIndex < originalEventPathSize; contextIndex++) {
        auto& context = downcast<MouseOrFocusEventContext>(*m_path[contextIndex]);

        TreeScope& currentTreeScope = context.node()->treeScope();
        if (UNLIKELY(previousTreeScope && &currentTreeScope != previousTreeScope))
            retargeter.moveToNewTreeScope(previousTreeScope, currentTreeScope);

        Node* currentRelatedNode = retargeter.currentNode(currentTreeScope);
        if (UNLIKELY(shouldTrimEventPath && !originIsRelatedTarget && context.target() == currentRelatedNode)) {
            m_path.shrink(contextIndex);
            break;
        }

        context.setRelatedTarget(currentRelatedNode);

        if (UNLIKELY(shouldTrimEventPath && originIsRelatedTarget && context.node() == &rootNodeInOriginTreeScope)) {
            m_path.shrink(contextIndex + 1);
            break;
        }

        previousTreeScope = &currentTreeScope;
    }
}

示例#2

void EventPath::setRelatedTarget(Node& origin, EventTarget& relatedTarget)
{
    Node* relatedNode = relatedTarget.toNode();
    if (!relatedNode || m_path.isEmpty())
        return;

    RelatedNodeRetargeter retargeter(*relatedNode, *m_path[0]->node());

    bool originIsRelatedTarget = &origin == relatedNode;
    bool relatedTargetScoped = m_event.relatedTargetScoped();
    Node& rootNodeInOriginTreeScope = origin.treeScope().rootNode();
    TreeScope* previousTreeScope = nullptr;
    size_t originalEventPathSize = m_path.size();
    for (unsigned contextIndex = 0; contextIndex < originalEventPathSize; contextIndex++) {
        auto& context = downcast<MouseOrFocusEventContext>(*m_path[contextIndex]);

        Node& currentTarget = *context.node();
        TreeScope& currentTreeScope = currentTarget.treeScope();
        if (UNLIKELY(previousTreeScope && &currentTreeScope != previousTreeScope))
            retargeter.moveToNewTreeScope(previousTreeScope, currentTreeScope);

        Node* currentRelatedNode = retargeter.currentNode(currentTarget);
        if (UNLIKELY(relatedTargetScoped && !originIsRelatedTarget && context.target() == currentRelatedNode)) {
            m_path.shrink(contextIndex);
            break;
        }

        context.setRelatedTarget(currentRelatedNode);

        if (UNLIKELY(relatedTargetScoped && originIsRelatedTarget && context.node() == &rootNodeInOriginTreeScope)) {
            m_path.shrink(contextIndex + 1);
            break;
        }

        previousTreeScope = &currentTreeScope;
    }
}

示例#3

void EventPath::retargetTouch(TouchEventContext::TouchListType touchListType, const Touch& touch)
{
    EventTarget* eventTarget = touch.target();
    if (!eventTarget)
        return;

    Node* targetNode = eventTarget->toNode();
    if (!targetNode)
        return;

    RelatedNodeRetargeter retargeter(*targetNode, *m_path[0]->node());
    TreeScope* previousTreeScope = nullptr;
    for (auto& context : m_path) {
        Node& currentTarget = *context->node();
        TreeScope& currentTreeScope = currentTarget.treeScope();
        if (UNLIKELY(previousTreeScope && &currentTreeScope != previousTreeScope))
            retargeter.moveToNewTreeScope(previousTreeScope, currentTreeScope);

        Node* currentRelatedNode = retargeter.currentNode(currentTarget);
        downcast<TouchEventContext>(*context).touchList(touchListType)->append(touch.cloneWithNewTarget(currentRelatedNode));

        previousTreeScope = &currentTreeScope;
    }
}