Always do a HIT_TEST

 Bug: 6490959
 The issue here is that if the page calls preventDefault on a
 touchstart handler WebViewClassic will not do a HIT_TEST as it
 doesn't get the ACTION_DOWN. This means that the mouse is in the
 wrong position when the click ultimately fires.

 This changes it so that WebViewInputDispatcher will always do a
 HIT_TEST at the start of a touch stream, which ensures that the
 mouse is positioned correctly.

Change-Id: I1aaca7692e2c7aeedeb21fa3592cd4cb3223ea25

Author: jreck

core/java/android/webkit/WebViewClassic.java

@@ -1719,6 +1719,10 @@ public void setOverScrollMode(int mode) {
         mZoomManager.updateDefaultZoomDensity(density);
     }
 
+    /* package */ int getScaledNavSlop() {
+        return viewToContentDimension(mNavSlop);
+    }
+
     /* package */ boolean onSavePassword(String schemePlusHost, String username,
             String password, final Message resumeMsg) {
         boolean rVal = false;
@@ -4339,10 +4343,6 @@ public void onDraw(Canvas canvas) {
     }
 
     private void removeTouchHighlight() {
-        if (mWebViewCore != null) {
-            mWebViewCore.removeMessages(EventHub.HIT_TEST);
-        }
-        mPrivateHandler.removeMessages(HIT_TEST_RESULT);
         setTouchHighlightRects(null);
     }
 
@@ -5834,7 +5834,6 @@ private void handleTouchEventCommon(MotionEvent event, int action, int x, int y)
         switch (action) {
             case MotionEvent.ACTION_DOWN: {
                 mConfirmMove = false;
-                mInitialHitTestResult = null;
                 if (!mEditTextScroller.isFinished()) {
                     mEditTextScroller.abortAnimation();
                 }
@@ -5856,23 +5855,6 @@ private void handleTouchEventCommon(MotionEvent event, int action, int x, int y)
                     }
                 } else { // the normal case
                     mTouchMode = TOUCH_INIT_MODE;
-                    // TODO: Have WebViewInputDispatch handle this
-                    TouchHighlightData data = new TouchHighlightData();
-                    data.mX = contentX;
-                    data.mY = contentY;
-                    data.mNativeLayerRect = new Rect();
-                    if (mNativeClass != 0) {
-                        data.mNativeLayer = nativeScrollableLayer(mNativeClass,
-                                contentX, contentY, data.mNativeLayerRect, null);
-                    } else {
-                        data.mNativeLayer = 0;
-                    }
-                    data.mSlop = viewToContentDimension(mNavSlop);
-                    removeTouchHighlight();
-                    if (!mBlockWebkitViewMessages && mWebViewCore != null) {
-                        mWebViewCore.sendMessageAtFrontOfQueue(
-                                EventHub.HIT_TEST, data);
-                    }
                     if (mLogEvent && eventTime - mLastTouchUpTime < 1000) {
                         EventLog.writeEvent(EventLogTags.BROWSER_DOUBLE_TAP_DURATION,
                                 (eventTime - mLastTouchUpTime), eventTime);

core/java/android/webkit/WebViewCore.java

@@ -1143,8 +1143,6 @@ public class EventHub implements WebViewInputDispatcher.WebKitCallbacks {
         static final int ADD_PACKAGE_NAME = 185;
         static final int REMOVE_PACKAGE_NAME = 186;
 
-        static final int HIT_TEST = 187;
-
         // accessibility support
         static final int MODIFY_SELECTION = 190;
 
@@ -1648,18 +1646,6 @@ public void handleMessage(Message msg) {
                                     (Set<String>) msg.obj);
                             break;
 
-                        case HIT_TEST:
-                            TouchHighlightData d = (TouchHighlightData) msg.obj;
-                            if (d.mNativeLayer != 0) {
-                                nativeScrollLayer(mNativeClass,
-                                        d.mNativeLayer, d.mNativeLayerRect);
-                            }
-                            WebKitHitTest hit = performHitTest(d.mX, d.mY, d.mSlop, true);
-                            mWebViewClassic.mPrivateHandler.obtainMessage(
-                                    WebViewClassic.HIT_TEST_RESULT, hit)
-                                    .sendToTarget();
-                            break;
-
                         case SET_USE_MOCK_DEVICE_ORIENTATION:
                             setUseMockDeviceOrientation();
                             break;
@@ -1788,6 +1774,15 @@ public boolean dispatchWebKitEvent(MotionEvent event, int eventType, int flags)
                 return false;
             }
             switch (eventType) {
+                case WebViewInputDispatcher.EVENT_TYPE_HIT_TEST:
+                    int x = Math.round(event.getX());
+                    int y = Math.round(event.getY());
+                    WebKitHitTest hit = performHitTest(x, y,
+                            mWebViewClassic.getScaledNavSlop(), true);
+                    mWebViewClassic.mPrivateHandler.obtainMessage(
+                            WebViewClassic.HIT_TEST_RESULT, hit).sendToTarget();
+                    return false;
+
                 case WebViewInputDispatcher.EVENT_TYPE_CLICK:
                     return nativeMouseClick(mNativeClass);
 

core/java/android/webkit/WebViewInputDispatcher.java

@@ -203,6 +203,11 @@ final class WebViewInputDispatcher {
      */
     public static final int EVENT_TYPE_DOUBLE_TAP = 5;
 
+    /**
+     * Event type: Indicates that a hit test should be performed
+     */
+    public static final int EVENT_TYPE_HIT_TEST = 6;
+
     /**
      * Flag: This event is private to this queue.  Do not forward it.
      */
@@ -499,13 +504,17 @@ private boolean isClickCandidateLocked(MotionEvent event) {
     }
 
     private void enqueueDoubleTapLocked(MotionEvent event) {
-        unscheduleClickLocked();
-        hideTapCandidateLocked();
         MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event);
         DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_DOUBLE_TAP, 0,
                 mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale);
         enqueueEventLocked(d);
-        mIsDoubleTapCandidate = false;
+    }
+
+    private void enqueueHitTestLocked(MotionEvent event) {
+        MotionEvent eventToEnqueue = MotionEvent.obtainNoHistory(event);
+        DispatchEvent d = obtainDispatchEventLocked(eventToEnqueue, EVENT_TYPE_HIT_TEST, 0,
+                mPostLastWebKitXOffset, mPostLastWebKitYOffset, mPostLastWebKitScale);
+        enqueueEventLocked(d);
     }
 
     private void checkForSlopLocked(MotionEvent event) {
@@ -545,6 +554,7 @@ private void updateStateTrackersLocked(DispatchEvent d, MotionEvent event) {
             mInitialDownX = event.getX();
             mInitialDownY = event.getY();
             scheduleShowTapHighlightLocked();
+            enqueueHitTestLocked(event);
         } else if (action == MotionEvent.ACTION_UP) {
             unscheduleLongPressLocked();
             if (isClickCandidateLocked(event)) {
@@ -824,6 +834,7 @@ private boolean shouldSkipWebKit(int eventType) {
             case EVENT_TYPE_CLICK:
             case EVENT_TYPE_HOVER:
             case EVENT_TYPE_SCROLL:
+            case EVENT_TYPE_HIT_TEST:
                 return false;
             case EVENT_TYPE_TOUCH:
                 return !mPostSendTouchEventsToWebKit