C++ TouchList::append方法代码示例

WebInputEventResult TouchEventManager::dispatchTouchEvents(
    const PlatformTouchEvent& event,
    const HeapVector<TouchInfo>& touchInfos,
    bool allTouchesReleased)
{
    bool touchStartOrFirstTouchMove = false;
    if (event.type() == PlatformEvent::TouchStart) {
        m_waitingForFirstTouchMove = true;
        touchStartOrFirstTouchMove = true;
    } else if (event.type() == PlatformEvent::TouchMove) {
        touchStartOrFirstTouchMove = m_waitingForFirstTouchMove;
        m_waitingForFirstTouchMove = false;
    }

    // Build up the lists to use for the |touches|, |targetTouches| and
    // |changedTouches| attributes in the JS event. See
    // http://www.w3.org/TR/touch-events/#touchevent-interface for how these
    // lists fit together.

    // Holds the complete set of touches on the screen.
    TouchList* touches = TouchList::create();

    // A different view on the 'touches' list above, filtered and grouped by
    // event target. Used for the |targetTouches| list in the JS event.
    using TargetTouchesHeapMap = HeapHashMap<EventTarget*, Member<TouchList>>;
    TargetTouchesHeapMap touchesByTarget;

    // Array of touches per state, used to assemble the |changedTouches| list.
    ChangedTouches changedTouches[PlatformTouchPoint::TouchStateEnd];

    for (unsigned i = 0; i < touchInfos.size(); ++i) {
        const TouchInfo& touchInfo = touchInfos[i];
        const PlatformTouchPoint& point = touchInfo.point;
        PlatformTouchPoint::TouchState pointState = point.state();

        if (touchInfo.consumed)
            continue;

        Touch* touch = Touch::create(
            touchInfo.targetFrame.get(),
            touchInfo.touchNode.get(),
            point.id(),
            point.screenPos(),
            touchInfo.contentPoint,
            touchInfo.adjustedRadius,
            point.rotationAngle(),
            point.force(),
            touchInfo.region);

        // Ensure this target's touch list exists, even if it ends up empty, so
        // it can always be passed to TouchEvent::Create below.
        TargetTouchesHeapMap::iterator targetTouchesIterator = touchesByTarget.find(touchInfo.touchNode.get());
        if (targetTouchesIterator == touchesByTarget.end()) {
            touchesByTarget.set(touchInfo.touchNode.get(), TouchList::create());
            targetTouchesIterator = touchesByTarget.find(touchInfo.touchNode.get());
        }

        // |touches| and |targetTouches| should only contain information about
        // touches still on the screen, so if this point is released or
        // cancelled it will only appear in the |changedTouches| list.
        if (pointState != PlatformTouchPoint::TouchReleased && pointState != PlatformTouchPoint::TouchCancelled) {
            touches->append(touch);
            targetTouchesIterator->value->append(touch);
        }

        // Now build up the correct list for |changedTouches|.
        // Note that  any touches that are in the TouchStationary state (e.g. if
        // the user had several points touched but did not move them all) should
        // never be in the |changedTouches| list so we do not handle them
        // explicitly here. See https://bugs.webkit.org/show_bug.cgi?id=37609
        // for further discussion about the TouchStationary state.
        if (pointState != PlatformTouchPoint::TouchStationary && touchInfo.knownTarget) {
            ASSERT(pointState < PlatformTouchPoint::TouchStateEnd);
            if (!changedTouches[pointState].m_touches)
                changedTouches[pointState].m_touches = TouchList::create();
            changedTouches[pointState].m_touches->append(touch);
            changedTouches[pointState].m_targets.add(touchInfo.touchNode);
        }
    }

    if (allTouchesReleased) {
        m_touchSequenceDocument.clear();
        m_touchSequenceUserGestureToken.clear();
    }

    WebInputEventResult eventResult = WebInputEventResult::NotHandled;

    // Now iterate through the |changedTouches| list and |m_targets| within it,
    // sending TouchEvents to the targets as required.
    for (unsigned state = 0; state != PlatformTouchPoint::TouchStateEnd; ++state) {
        if (!changedTouches[state].m_touches)
            continue;

        const AtomicString& eventName(touchEventNameForTouchPointState(static_cast<PlatformTouchPoint::TouchState>(state)));
        for (const auto& eventTarget : changedTouches[state].m_targets) {
            EventTarget* touchEventTarget = eventTarget;
            TouchEvent* touchEvent = TouchEvent::create(
                touches, touchesByTarget.get(touchEventTarget), changedTouches[state].m_touches.get(),
                eventName, touchEventTarget->toNode()->document().domWindow(),
                event.getModifiers(), event.cancelable(), event.causesScrollingIfUncanceled(), event.timestamp());
//.........这里部分代码省略.........