C++ (Cpp) PassOwnPtr::hasNewRootStateNode примеры использования

Пример #1

void ScrollingTree::commitNewTreeState(PassOwnPtr<ScrollingStateTree> scrollingStateTree)
{
    bool rootStateNodeChanged = scrollingStateTree->hasNewRootStateNode();

    ScrollingStateScrollingNode* rootNode = scrollingStateTree->rootStateNode();
    if (rootNode
            && (rootStateNodeChanged
                || rootNode->hasChangedProperty(ScrollingStateScrollingNode::WheelEventHandlerCount)
                || rootNode->hasChangedProperty(ScrollingStateScrollingNode::NonFastScrollableRegion)
                || rootNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))) {
        MutexLocker lock(m_mutex);

        if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateNode::ScrollLayer))
            m_mainFrameScrollPosition = FloatPoint();
        if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateScrollingNode::WheelEventHandlerCount))
            m_hasWheelEventHandlers = scrollingStateTree->rootStateNode()->wheelEventHandlerCount();
        if (rootStateNodeChanged || rootNode->hasChangedProperty(ScrollingStateScrollingNode::NonFastScrollableRegion))
            m_nonFastScrollableRegion = scrollingStateTree->rootStateNode()->nonFastScrollableRegion();
    }

    bool scrollRequestIsProgammatic = rootNode ? rootNode->requestedScrollPositionRepresentsProgrammaticScroll() : false;
    TemporaryChange<bool> changeHandlingProgrammaticScroll(m_isHandlingProgrammaticScroll, scrollRequestIsProgammatic);

    removeDestroyedNodes(*scrollingStateTree);
    updateTreeFromStateNode(rootNode);
}