Resize navbar on window focus change. Fix resizing glitches.

app/src/common/shared/org/mozilla/vrbrowser/VRBrowserActivity.java

@@ -635,16 +635,16 @@ void dispatchCreateWidgetLayer(final int aHandle, final Surface aSurface, final
                 }
             };
 
-
             widget.setSurface(aSurface, aWidth, aHeight, aFirstDrawCallback);
 
-            View view = (View) widget;
+            UIWidget view = (UIWidget) widget;
             // Add widget to a virtual display for invalidation
             if (aSurface != null && view.getParent() == null) {
                 mWidgetContainer.addView(view, new FrameLayout.LayoutParams(widget.getPlacement().viewWidth(), widget.getPlacement().viewHeight()));
-            } else if (aSurface == null && view.getParent() != null) {
+            }  else if (aSurface == null && view.getParent() != null) {
                 mWidgetContainer.removeView(view);
             }
+            view.setResizing(false);
             view.postInvalidate();
         });
     }
@@ -1021,15 +1021,22 @@ public void updateWidget(final Widget aWidget) {
             // Widget not added yet
             return;
         }
+        UIWidget view = (UIWidget)aWidget;
+
         if (params.width != viewWidth || params.height != viewHeight) {
             params.width = viewWidth;
             params.height = viewHeight;
+            if (view.isLayer()) {
+                // Reuse last frame and do not render while resizing surface with Layers enabled.
+                // Fixes resizing glitches.
+                view.setResizing(true);
+            }
             ((View)aWidget).setLayoutParams(params);
             aWidget.resizeSurface(textureWidth, textureHeight);
         }
 
         boolean visible = aWidget.getPlacement().visible;
-        View view = (View)aWidget;
+
         if (visible != (view.getVisibility() == View.VISIBLE)) {
             view.setVisibility(visible ? View.VISIBLE : View.GONE);
         }

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/NavigationBarWidget.java

@@ -423,6 +423,7 @@ public void attachToWindow(@NonNull WindowWidget aWindow) {
             updateServoButton();
             handleSessionState();
         }
+        handleWindowResize();
     }
 
     @Override
@@ -843,12 +844,14 @@ public void onFullScreen(GeckoSession session, boolean aFullScreen) {
     // WidgetManagerDelegate.UpdateListener
     @Override
     public void onWidgetUpdate(Widget aWidget) {
-        if (aWidget != mAttachedWindow || mIsResizing) {
-            return;
+        if (aWidget == mAttachedWindow && !mIsResizing) {
+            handleWindowResize();
         }
+    }
 
+    private void handleWindowResize() {
         // Browser window may have been resized, adjust the navigation bar
-        float targetWidth = aWidget.getPlacement().worldWidth;
+        float targetWidth = mAttachedWindow.getPlacement().worldWidth;
         float defaultWidth = WidgetPlacement.floatDimension(getContext(), R.dimen.window_world_width);
         targetWidth = Math.max(defaultWidth, targetWidth);
         targetWidth = Math.min(targetWidth, defaultWidth * 1.5f);
@@ -857,6 +860,7 @@ public void onWidgetUpdate(Widget aWidget) {
         mWidgetPlacement.worldWidth = targetWidth;
         mWidgetPlacement.width = (int) (WidgetPlacement.dpDimension(getContext(), R.dimen.navigation_bar_width) * ratio);
         mWidgetManager.updateWidget(this);
+        postInvalidate();
     }
 
     // SessionStack.SessionChangeListener

app/src/common/shared/org/mozilla/vrbrowser/ui/widgets/UIWidget.java

@@ -48,6 +48,7 @@ public interface Delegate {
     protected Delegate mDelegate;
     protected int mBorderWidth;
     private Runnable mFirstDrawCallback;
+    protected boolean mResizing = false;
 
     public UIWidget(Context aContext) {
         super(aContext);
@@ -233,6 +234,9 @@ public void draw(Canvas aCanvas) {
     }
 
     private void draw(Canvas aCanvas, UISurfaceTextureRenderer aRenderer) {
+        if (mResizing) {
+            return;
+        }
         Canvas textureCanvas = aRenderer.drawBegin();
         if(textureCanvas != null) {
             // set the proper scale
@@ -278,6 +282,14 @@ public void toggle() {
         }
     }
 
+    public void setResizing(boolean aResizing) {
+        mResizing = aResizing;
+    }
+
+    public boolean isLayer() {
+        return mRenderer != null && mRenderer.isLayer();
+    }
+
     @IntDef(value = { REQUEST_FOCUS, CLEAR_FOCUS })
     public @interface ShowFlags {}
     public static final int REQUEST_FOCUS = 0;