void EventDispatcher::wheelEvent(uint64_t pageID, const WebWheelEvent& wheelEvent, bool canGoBack, bool canGoForward)
{
#if ENABLE(THREADED_SCROLLING)
    MutexLocker locker(m_scrollingTreesMutex);
    if (ScrollingTree* scrollingTree = m_scrollingTrees.get(pageID)) {
        PlatformWheelEvent platformWheelEvent = platform(wheelEvent);

        // FIXME: It's pretty horrible that we're updating the back/forward state here.
        // WebCore should always know the current state and know when it changes so the
        // scrolling tree can be notified.
        // We only need to do this at the beginning of the gesture.
        if (platformWheelEvent.phase() == PlatformWheelEventPhaseBegan)
            ScrollingThread::dispatch(bind(&ScrollingTree::updateBackForwardState, scrollingTree, canGoBack, canGoForward));

        ScrollingTree::EventResult result = scrollingTree->tryToHandleWheelEvent(platformWheelEvent);
        if (result == ScrollingTree::DidHandleEvent || result == ScrollingTree::DidNotHandleEvent) {
            sendDidReceiveEvent(pageID, wheelEvent, result == ScrollingTree::DidHandleEvent);
            return;
        }
    }
#else
    UNUSED_PARAM(canGoBack);
    UNUSED_PARAM(canGoForward);
#endif

    RunLoop::main()->dispatch(bind(&EventDispatcher::dispatchWheelEvent, this, pageID, wheelEvent));
}
Exemple #2
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void EventDispatcher::wheelEvent(uint64_t pageID, const WebWheelEvent& wheelEvent, bool canRubberBandAtLeft, bool canRubberBandAtRight, bool canRubberBandAtTop, bool canRubberBandAtBottom)
{
    PlatformWheelEvent platformWheelEvent = platform(wheelEvent);

#if PLATFORM(COCOA)
    switch (wheelEvent.phase()) {
    case PlatformWheelEventPhaseBegan:
        m_recentWheelEventDeltaTracker->beginTrackingDeltas();
        break;
    case PlatformWheelEventPhaseEnded:
        m_recentWheelEventDeltaTracker->endTrackingDeltas();
        break;
    default:
        break;
    }

    if (m_recentWheelEventDeltaTracker->isTrackingDeltas()) {
        m_recentWheelEventDeltaTracker->recordWheelEventDelta(platformWheelEvent);

        DominantScrollGestureDirection dominantDirection = DominantScrollGestureDirection::None;
        dominantDirection = m_recentWheelEventDeltaTracker->dominantScrollGestureDirection();

        // Workaround for scrolling issues <rdar://problem/14758615>.
        if (dominantDirection == DominantScrollGestureDirection::Vertical && platformWheelEvent.deltaX())
            platformWheelEvent = platformWheelEvent.copyIgnoringHorizontalDelta();
        else if (dominantDirection == DominantScrollGestureDirection::Horizontal && platformWheelEvent.deltaY())
            platformWheelEvent = platformWheelEvent.copyIgnoringVerticalDelta();
    }
#endif

#if ENABLE(ASYNC_SCROLLING)
    MutexLocker locker(m_scrollingTreesMutex);
    if (ThreadedScrollingTree* scrollingTree = m_scrollingTrees.get(pageID)) {
        // FIXME: It's pretty horrible that we're updating the back/forward state here.
        // WebCore should always know the current state and know when it changes so the
        // scrolling tree can be notified.
        // We only need to do this at the beginning of the gesture.
        if (platformWheelEvent.phase() == PlatformWheelEventPhaseBegan)
            ScrollingThread::dispatch(bind(&ThreadedScrollingTree::setCanRubberBandState, scrollingTree, canRubberBandAtLeft, canRubberBandAtRight, canRubberBandAtTop, canRubberBandAtBottom));

        ScrollingTree::EventResult result = scrollingTree->tryToHandleWheelEvent(platformWheelEvent);
        if (result == ScrollingTree::DidHandleEvent || result == ScrollingTree::DidNotHandleEvent) {
            sendDidReceiveEvent(pageID, wheelEvent, result == ScrollingTree::DidHandleEvent);
            return;
        }
    }
#else
    UNUSED_PARAM(canRubberBandAtLeft);
    UNUSED_PARAM(canRubberBandAtRight);
    UNUSED_PARAM(canRubberBandAtTop);
    UNUSED_PARAM(canRubberBandAtBottom);
#endif

    RunLoop::main().dispatch(bind(&EventDispatcher::dispatchWheelEvent, this, pageID, wheelEvent));
}