Bug 725458 - Start touch timeout during action_down. r=mbrubeck

mobile/android/base/gfx/LayerController.java

@@ -111,11 +111,10 @@ public class LayerController implements Tabs.OnTabsChangedListener {
 
     /* The time limit for pages to respond with preventDefault on touchevents
      * before we begin panning the page */
-    private static final int PREVENT_DEFAULT_TIMEOUT = 200;
+    private int mTimeout = 200;
 
     private boolean allowDefaultActions = true;
     private Timer allowDefaultTimer =  null;
-    private boolean inTouchSession = false;
     private PointF initialTouchLocation = null;
 
     public LayerController(Context context) {
@@ -127,6 +126,9 @@ public class LayerController implements Tabs.OnTabsChangedListener {
         mView = new LayerView(context, this);
 
         Tabs.getInstance().registerOnTabsChangedListener(this);
+
+        ViewConfiguration vc = ViewConfiguration.get(mContext); 
+        mTimeout = vc.getLongPressTimeout();
     }
 
     public void onDestroy() {
@@ -390,15 +392,29 @@ public class LayerController implements Tabs.OnTabsChangedListener {
         int action = event.getAction();
         PointF point = new PointF(event.getX(), event.getY());
 
+        // this will only match the first touchstart in a series
         if ((action & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
-            mView.clearEventQueue();
             initialTouchLocation = point;
             allowDefaultActions = !mWaitForTouchListeners;
-            post(new Runnable() {
+
+            // if we have a timer, this may be a double tap,
+            // cancel the current timer but don't clear the event queue
+            if (allowDefaultTimer != null) {
+              allowDefaultTimer.cancel();
+            } else {
+              // if we don't have a timer, make sure we remove any old events
+              mView.clearEventQueue();
+            }
+            allowDefaultTimer = new Timer();
+            allowDefaultTimer.schedule(new TimerTask() {
                 public void run() {
-                    preventPanning(mWaitForTouchListeners);
+                    post(new Runnable() {
+                        public void run() {
+                            preventPanning(false);
+                        }
+                    });
                 }
-            });
+            }, mTimeout);
         }
 
         // After the initial touch, ignore touch moves until they exceed a minimum distance.
@@ -410,55 +426,16 @@ public class LayerController implements Tabs.OnTabsChangedListener {
             }
         }
 
+        // send the event to content
         if (mOnTouchListener != null)
             mOnTouchListener.onTouch(mView, event);
 
-        if (!mWaitForTouchListeners)
-            return !allowDefaultActions;
-
-        boolean createTimer = false;
-        switch (action & MotionEvent.ACTION_MASK) {
-            case MotionEvent.ACTION_MOVE: {
-                if (!inTouchSession && allowDefaultTimer == null) {
-                    inTouchSession = true;
-                    createTimer = true;
-                }
-                break;
-            }
-            case MotionEvent.ACTION_CANCEL:
-            case MotionEvent.ACTION_UP: {
-                // if we still have initialTouchLocation, we haven't fired any
-                // touchmove events. We should start the timer to wait for preventDefault
-                // from touchstart. If we don't hear from it we fire mouse events
-                if (initialTouchLocation != null)
-                    createTimer = true;
-                inTouchSession = false;
-            }
-        }
-
-        if (createTimer) {
-            if (allowDefaultTimer != null) {
-              allowDefaultTimer.cancel();
-            }
-            allowDefaultTimer = new Timer();
-            allowDefaultTimer.schedule(new TimerTask() {
-                public void run() {
-                    post(new Runnable() {
-                        public void run() {
-                            preventPanning(false);
-                        }
-                    });
-                }
-            }, PREVENT_DEFAULT_TIMEOUT);
-        }
-
         return !allowDefaultActions;
     }
 
     public void preventPanning(boolean aValue) {
         if (allowDefaultTimer != null) {
             allowDefaultTimer.cancel();
-            allowDefaultTimer.purge();
             allowDefaultTimer = null;
         }
         if (aValue == allowDefaultActions) {