private void skipWebKitEventLocked(DispatchEvent d) {
d.mNext = null;
if ((d.mFlags & FLAG_PRIVATE) != 0) {
recycleDispatchEventLocked(d);
} else {
d.mFlags |= FLAG_WEBKIT_TIMEOUT;
enqueueUiEventUnbatchedLocked(d);
}
}
private DispatchEvent obtainUninitializedDispatchEventLocked() {
DispatchEvent d = mDispatchEventPool;
if (d != null) {
mDispatchEventPoolSize -= 1;
mDispatchEventPool = d.mNext;
d.mNext = null;
} else {
d = new DispatchEvent();
}
return d;
}
private void recycleDispatchEventLocked(DispatchEvent d) {
if (d.mEvent != null) {
d.mEvent.recycle();
d.mEvent = null;
}
if (mDispatchEventPoolSize < MAX_DISPATCH_EVENT_POOL_SIZE) {
mDispatchEventPoolSize += 1;
d.mNext = mDispatchEventPool;
mDispatchEventPool = d;
}
}
private void dispatchUiEvents(boolean calledFromHandler) {
for (; ; ) {
MotionEvent event;
final int eventType;
final int flags;
synchronized (mLock) {
DispatchEvent d = mUiDispatchEventQueue.dequeue();
if (d == null) {
if (mUiDispatchScheduled) {
mUiDispatchScheduled = false;
if (!calledFromHandler) {
mUiHandler.removeMessages(UiHandler.MSG_DISPATCH_UI_EVENTS);
}
}
return;
}
event = d.mEvent;
if (event != null && (d.mFlags & FLAG_WEBKIT_TRANSFORMED_EVENT) != 0) {
event.scale(1.0f / d.mWebKitScale);
event.offsetLocation(-d.mWebKitXOffset, -d.mWebKitYOffset);
d.mFlags &= ~FLAG_WEBKIT_TRANSFORMED_EVENT;
}
eventType = d.mEventType;
if (eventType == EVENT_TYPE_TOUCH) {
event = mUiTouchStream.update(event);
if (DEBUG && event == null && d.mEvent != null) {
Log.d(TAG, "dispatchUiEvents: dropped event " + d.mEvent);
}
}
flags = d.mFlags;
if (event == d.mEvent) {
d.mEvent = null; // retain ownership of event, don't recycle it yet
}
recycleDispatchEventLocked(d);
if (eventType == EVENT_TYPE_CLICK) {
scheduleHideTapHighlightLocked();
}
}
// Handle the event.
if (event != null) {
dispatchUiEvent(event, eventType, flags);
event.recycle();
}
}
}
public DispatchEvent dequeue() {
DispatchEvent d = mHead;
if (d != null) {
DispatchEvent next = d.mNext;
if (next == null) {
mHead = null;
mTail = null;
} else {
mHead = next;
d.mNext = null;
}
}
return d;
}
private DispatchEvent copyDispatchEventLocked(DispatchEvent d) {
DispatchEvent copy = obtainUninitializedDispatchEventLocked();
if (d.mEvent != null) {
copy.mEvent = d.mEvent.copy();
}
copy.mEventType = d.mEventType;
copy.mFlags = d.mFlags;
copy.mTimeoutTime = d.mTimeoutTime;
copy.mWebKitXOffset = d.mWebKitXOffset;
copy.mWebKitYOffset = d.mWebKitYOffset;
copy.mWebKitScale = d.mWebKitScale;
copy.mNext = d.mNext;
return copy;
}
public void enqueue(DispatchEvent d) {
if (mHead == null) {
mHead = d;
mTail = d;
} else {
mTail.mNext = d;
mTail = d;
}
}
// Runs on UI thread in response to the web kit thread appearing to be unresponsive.
private void handleWebKitTimeout() {
synchronized (mLock) {
if (!mWebKitTimeoutScheduled) {
return;
}
mWebKitTimeoutScheduled = false;
if (DEBUG) {
Log.d(TAG, "handleWebKitTimeout: timeout occurred!");
}
// Drain the web kit event queue.
DispatchEvent d = mWebKitDispatchEventQueue.dequeueList();
// If web kit was processing an event (must be at the head of the list because
// it can only do one at a time), then clone it or ignore it.
if ((d.mFlags & FLAG_WEBKIT_IN_PROGRESS) != 0) {
d.mFlags |= FLAG_WEBKIT_TIMEOUT;
if ((d.mFlags & FLAG_PRIVATE) != 0) {
d = d.mNext; // the event is private to web kit, ignore it
} else {
d = copyDispatchEventLocked(d);
d.mFlags &= ~FLAG_WEBKIT_IN_PROGRESS;
}
}
// Enqueue all non-private events for handling by the UI thread.
while (d != null) {
DispatchEvent next = d.mNext;
skipWebKitEventLocked(d);
d = next;
}
// Tell web kit to cancel all pending touches.
// This also prevents us from sending web kit any more touches until the
// next gesture begins. (As required to ensure touch event stream consistency.)
enqueueWebKitCancelTouchEventIfNeededLocked();
}
}
private DispatchEvent obtainDispatchEventLocked(
MotionEvent event,
int eventType,
int flags,
int webKitXOffset,
int webKitYOffset,
float webKitScale) {
DispatchEvent d = obtainUninitializedDispatchEventLocked();
d.mEvent = event;
d.mEventType = eventType;
d.mFlags = flags;
d.mTimeoutTime = SystemClock.uptimeMillis() + WEBKIT_TIMEOUT_MILLIS;
d.mWebKitXOffset = webKitXOffset;
d.mWebKitYOffset = webKitYOffset;
d.mWebKitScale = webKitScale;
if (DEBUG) {
Log.d(TAG, "Timeout time: " + (d.mTimeoutTime - SystemClock.uptimeMillis()));
}
return d;
}
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();
}
}
}
}