Support skipping a touch stream due to lack of handlers

 Bug: 6317798

Change-Id: Ia1652e9030e877e270326e9e8a8b040810b89f09

Author: jreck

core/java/android/webkit/WebViewCore.java

@@ -660,7 +660,7 @@ private native String nativeRetrieveImageSource(int nativeClass,
             int x, int y);
     private native boolean nativeMouseClick(int nativeClass);
 
-    private native boolean nativeHandleTouchEvent(int nativeClass, int action,
+    private native int nativeHandleTouchEvent(int nativeClass, int action,
             int[] idArray, int[] xArray, int[] yArray, int count,
             int actionIndex, int metaState);
 
@@ -959,6 +959,9 @@ static class TextFieldInitData {
     static final int ACTION_LONGPRESS = 0x100;
     static final int ACTION_DOUBLETAP = 0x200;
 
+    private static final int TOUCH_FLAG_HIT_HANDLER = 0x1;
+    private static final int TOUCH_FLAG_PREVENT_DEFAULT = 0x2;
+
     static class TouchEventData {
         int mAction;
         int[] mIds;  // Ids of the touch points
@@ -1775,7 +1778,8 @@ public Looper getWebKitLooper() {
         }
 
         @Override
-        public boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags) {
+        public boolean dispatchWebKitEvent(WebViewInputDispatcher dispatcher,
+                MotionEvent event, int eventType, int flags) {
             if (mNativeClass == 0) {
                 return false;
             }
@@ -1802,10 +1806,16 @@ public boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags)
                         xArray[i] = (int) event.getX(i);
                         yArray[i] = (int) event.getY(i);
                     }
-                    return nativeHandleTouchEvent(mNativeClass,
+                    int touchFlags = nativeHandleTouchEvent(mNativeClass,
                             event.getActionMasked(),
                             idArray, xArray, yArray, count,
                             event.getActionIndex(), event.getMetaState());
+                    if (touchFlags == 0
+                            && event.getActionMasked() != MotionEvent.ACTION_CANCEL
+                            && (flags & WebViewInputDispatcher.FLAG_PRIVATE) == 0) {
+                        dispatcher.skipWebkitForRemainingTouchStream();
+                    }
+                    return (touchFlags & TOUCH_FLAG_PREVENT_DEFAULT) > 0;
                 }
 
                 default:

core/java/android/webkit/WebViewInputDispatcher.java

@@ -686,7 +686,7 @@ private boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags)
                     + ", eventType=" + eventType + ", flags=" + flags);
         }
         boolean preventDefault = mWebKitCallbacks.dispatchWebKitEvent(
-                event, eventType, flags);
+                this, event, eventType, flags);
         if (DEBUG) {
             Log.d(TAG, "dispatchWebKitEvent: preventDefault=" + preventDefault);
         }
@@ -710,6 +710,12 @@ && isMoveEventLocked(d.mNext)) {
         mWebKitDispatchEventQueue.mHead = d;
     }
 
+    // Called by WebKit when it doesn't care about the rest of the touch stream
+    public void skipWebkitForRemainingTouchStream() {
+        // Just treat this like a timeout
+        handleWebKitTimeout();
+    }
+
     // Runs on UI thread in response to the web kit thread appearing to be unresponsive.
     private void handleWebKitTimeout() {
         synchronized (mLock) {
@@ -1081,12 +1087,14 @@ public static interface WebKitCallbacks {
 
         /**
          * Dispatches an event to web kit.
+         * @param dispatcher The WebViewInputDispatcher sending the event
          * @param event The event.
          * @param eventType The event type.
          * @param flags The event's dispatch flags.
          * @return True if web kit wants to prevent default event handling.
          */
-        public boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags);
+        public boolean dispatchWebKitEvent(WebViewInputDispatcher dispatcher,
+                MotionEvent event, int eventType, int flags);
     }
 
     // Runs on UI thread.