Dismiss sliding key input preview when touch event is canceled

This is a follow up of Id807af31.

Bug: 7662486
Change-Id: I13895140f1214592257d0023c1450875a4885ee9

java/src/com/android/inputmethod/keyboard/KeyboardView.java

@@ -860,6 +860,11 @@ public class KeyboardView extends View implements PointerTracker.DrawingProxy {
         mPreviewPlacerView.showSlidingKeyInputPreview(tracker);
     }
 
+    @Override
+    public void dismissSlidingKeyInputPreview() {
+        mPreviewPlacerView.dismissSlidingKeyInputPreview();
+    }
+
     public void showGestureFloatingPreviewText(final String gestureFloatingPreviewText) {
         locatePreviewPlacerView();
         mPreviewPlacerView.setGestureFloatingPreviewText(gestureFloatingPreviewText);

java/src/com/android/inputmethod/keyboard/PointerTracker.java

@@ -82,6 +82,7 @@ public final class PointerTracker implements PointerTrackerQueue.Element {
         public void showKeyPreview(PointerTracker tracker);
         public void dismissKeyPreview(PointerTracker tracker);
         public void showSlidingKeyInputPreview(PointerTracker tracker);
+        public void dismissSlidingKeyInputPreview();
         public void showGesturePreviewTrail(PointerTracker tracker, boolean isOldestTracker);
     }
 
@@ -881,7 +882,7 @@ public final class PointerTracker implements PointerTrackerQueue.Element {
     private void resetSlidingKeyInput() {
         mIsInSlidingKeyInput = false;
         mIsInSlidingKeyInputFromModifier = false;
-        mDrawingProxy.showSlidingKeyInputPreview(this);
+        mDrawingProxy.dismissSlidingKeyInputPreview();
     }
 
     private void onGestureMoveEvent(final int x, final int y, final long eventTime,

java/src/com/android/inputmethod/keyboard/internal/PreviewPlacerView.java

@@ -220,6 +220,10 @@ public final class PreviewPlacerView extends RelativeLayout {
         invalidate();
     }
 
+    public void dismissSlidingKeyInputPreview() {
+        mShowSlidingKeyInputPreview = false;
+    }
+
     @Override
     protected void onDetachedFromWindow() {
         freeOffscreenBuffer();