Пример #1
0
void ScrollingTree::setOrClearLatchedNode(const PlatformWheelEvent& wheelEvent, ScrollingNodeID nodeID)
{
    if (wheelEvent.shouldConsiderLatching())
        setLatchedNode(nodeID);
    else if (wheelEvent.shouldResetLatching())
        clearLatchedNode();
}
Пример #2
0
bool ScrollingTree::shouldHandleWheelEventSynchronously(const PlatformWheelEvent& wheelEvent)
{
    // This method is invoked by the event handling thread
    MutexLocker lock(m_mutex);

    if (m_hasWheelEventHandlers)
        return true;

    bool shouldSetLatch = wheelEvent.shouldConsiderLatching();

    if (hasLatchedNode() && !shouldSetLatch)
        return false;

    if (shouldSetLatch)
        m_latchedNode = 0;

    if (!m_nonFastScrollableRegion.isEmpty()) {
        // FIXME: This is not correct for non-default scroll origins.
        FloatPoint position = wheelEvent.position();
        position.moveBy(m_mainFrameScrollPosition);
        if (m_nonFastScrollableRegion.contains(roundedIntPoint(position)))
            return true;
    }
    return false;
}