private void scheduleWebKitDispatchLocked() {
if (!mWebKitDispatchScheduled) {
mWebKitHandler.sendEmptyMessage(WebKitHandler.MSG_DISPATCH_WEBKIT_EVENTS);
mWebKitDispatchScheduled = true;
}
}
private void dispatchWebKitEvents(boolean calledFromHandler) {
for (; ; ) {
// Get the next event, but leave it in the queue so we can move it to the UI
// queue if a timeout occurs.
DispatchEvent d;
MotionEvent event;
final int eventType;
int flags;
synchronized (mLock) {
if (!ENABLE_EVENT_BATCHING) {
drainStaleWebKitEventsLocked();
}
d = mWebKitDispatchEventQueue.mHead;
if (d == null) {
if (mWebKitDispatchScheduled) {
mWebKitDispatchScheduled = false;
if (!calledFromHandler) {
mWebKitHandler.removeMessages(WebKitHandler.MSG_DISPATCH_WEBKIT_EVENTS);
}
}
return;
}
event = d.mEvent;
if (event != null) {
event.offsetLocation(d.mWebKitXOffset, d.mWebKitYOffset);
event.scale(d.mWebKitScale);
d.mFlags |= FLAG_WEBKIT_TRANSFORMED_EVENT;
}
eventType = d.mEventType;
if (eventType == EVENT_TYPE_TOUCH) {
event = mWebKitTouchStream.update(event);
if (DEBUG && event == null && d.mEvent != null) {
Log.d(TAG, "dispatchWebKitEvents: dropped event " + d.mEvent);
}
}
d.mFlags |= FLAG_WEBKIT_IN_PROGRESS;
flags = d.mFlags;
}
// Handle the event.
final boolean preventDefault;
if (event == null) {
preventDefault = false;
} else {
preventDefault = dispatchWebKitEvent(event, eventType, flags);
}
synchronized (mLock) {
/// M: update last event prevent status. @ {
boolean lastPreventDefault = false;
if (d.mEventType == EVENT_TYPE_TOUCH) {
lastPreventDefault = mWebKitPreventTouchStream.update(event, preventDefault);
}
/// @ }
flags = d.mFlags;
d.mFlags = flags & ~FLAG_WEBKIT_IN_PROGRESS;
boolean recycleEvent = event != d.mEvent;
if ((flags & FLAG_WEBKIT_TIMEOUT) != 0) {
// A timeout occurred!
recycleDispatchEventLocked(d);
} else {
// Web kit finished in a timely manner. Dequeue the event.
assert mWebKitDispatchEventQueue.mHead == d;
mWebKitDispatchEventQueue.dequeue();
updateWebKitTimeoutLocked();
if ((flags & FLAG_PRIVATE) != 0) {
// Event was intended for web kit only. All done.
recycleDispatchEventLocked(d);
} else if (preventDefault) {
// Web kit has decided to consume the event!
if (d.mEventType == EVENT_TYPE_TOUCH) {
/// M: Consider two consistent events is preventDefault. @ {
if (lastPreventDefault) {
Log.d(TAG, "Webkit prevent current and last event, cancel ui event");
enqueueUiCancelTouchEventIfNeededLocked();
} else {
Log.d(TAG, "Webkit prevent current but not last event, enqueue ui event");
/// Only one event is preventDefault, Ui also handle this touch event.
enqueueUiEventUnbatchedLocked(d);
}
unscheduleLongPressLocked();
/// @ }
}
} else {
// Web kit is being friendly. Pass the event to the UI.
enqueueUiEventUnbatchedLocked(d);
}
}
if (event != null && recycleEvent) {
event.recycle();
}
if (eventType == EVENT_TYPE_CLICK) {
scheduleHideTapHighlightLocked();
}
}
}
}