Long press not working if explore by touch and magnification are on.

1. In the magnifier we are caching the touch events until we figure
   out whether the user is triple tapping to enable magnification.
   If the user is not trying to engage magnification we deliver the
   stashed events. However, these events are stale and the subsequent
   transformations such as the touch explorer get confused when trying
   to detect a tap since the delay is longer than the tap slop.
   This change compensates for the time the events were cached
   before sending them to the next transformation in the chain.

bug:7362365

Change-Id: Idd8539ffed7ba4892c5a916bd34910fd2ef50f75

Author: sganov

services/java/com/android/server/accessibility/ScreenMagnifier.java

@@ -38,6 +38,7 @@
 import android.os.Message;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.os.SystemClock;
 import android.provider.Settings;
 import android.util.Property;
 import android.util.Slog;
@@ -662,12 +663,33 @@ private void sendDelayedMotionEvents() {
             while (mDelayedEventQueue != null) {
                 MotionEventInfo info = mDelayedEventQueue;
                 mDelayedEventQueue = info.mNext;
-                ScreenMagnifier.this.onMotionEvent(info.mEvent, info.mRawEvent,
-                        info.mPolicyFlags);
+                final long offset = SystemClock.uptimeMillis() - info.mCachedTimeMillis;
+                MotionEvent event = obtainEventWithOffsetTimeAndDownTime(info.mEvent, offset);
+                MotionEvent rawEvent = obtainEventWithOffsetTimeAndDownTime(info.mRawEvent, offset);
+                ScreenMagnifier.this.onMotionEvent(event, rawEvent, info.mPolicyFlags);
+                event.recycle();
+                rawEvent.recycle();
                 info.recycle();
             }
         }
 
+        private MotionEvent obtainEventWithOffsetTimeAndDownTime(MotionEvent event, long offset) {
+            final int pointerCount = event.getPointerCount();
+            PointerCoords[] coords = getTempPointerCoordsWithMinSize(pointerCount);
+            PointerProperties[] properties = getTempPointerPropertiesWithMinSize(pointerCount);
+            for (int i = 0; i < pointerCount; i++) {
+                event.getPointerCoords(i, coords[i]);
+                event.getPointerProperties(i, properties[i]);
+            }
+            final long downTime = event.getDownTime() + offset;
+            final long eventTime = event.getEventTime() + offset;
+            return MotionEvent.obtain(downTime, eventTime,
+                    event.getAction(), pointerCount, properties, coords,
+                    event.getMetaState(), event.getButtonState(),
+                    1.0f, 1.0f, event.getDeviceId(), event.getEdgeFlags(),
+                    event.getSource(), event.getFlags());
+        }
+
         private void clearDelayedMotionEvents() {
             while (mDelayedEventQueue != null) {
                 MotionEventInfo info = mDelayedEventQueue;
@@ -746,6 +768,7 @@ private static final class MotionEventInfo {
         public MotionEvent mEvent;
         public MotionEvent mRawEvent;
         public int mPolicyFlags;
+        public long mCachedTimeMillis;
 
         public static MotionEventInfo obtain(MotionEvent event, MotionEvent rawEvent,
                 int policyFlags) {
@@ -770,6 +793,7 @@ private void initialize(MotionEvent event, MotionEvent rawEvent,
             mEvent = MotionEvent.obtain(event);
             mRawEvent = MotionEvent.obtain(rawEvent);
             mPolicyFlags = policyFlags;
+            mCachedTimeMillis = SystemClock.uptimeMillis();
         }
 
         public void recycle() {
@@ -793,6 +817,7 @@ private void clear() {
             mRawEvent.recycle();
             mRawEvent = null;
             mPolicyFlags = 0;
+            mCachedTimeMillis = 0;
         }
     }