AppThemer: Animate FAB in when App Themer clicked

When the user presses the app themer icon, the FAB would immediately
show up on the screen.  This patch animates it in rather than abruptly
show it.

Change-Id: I89bb198b36a1d6d66fc0cb0fb9b675f1f95e6463

1 files changed, 24 insertions, 0 deletions

diff --git a/src/com/cyngn/theme/perapptheming/PerAppThemingWindow.java b/src/com/cyngn/theme/perapptheming/PerAppThemingWindow.java
index 1b2000a..f550e62 100644
--- a/src/com/cyngn/theme/perapptheming/PerAppThemingWindow.java
+++ b/src/com/cyngn/theme/perapptheming/PerAppThemingWindow.java
@@ -28,6 +28,7 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnTouchListener;
 import android.view.ViewGroup;
+import android.view.ViewTreeObserver;
 import android.view.WindowManager;
 import android.view.animation.Interpolator;
 import android.view.animation.LinearInterpolator;
@@ -158,6 +159,7 @@ public class PerAppThemingWindow extends Service implements OnTouchListener,
         mDraggableIcon.setOnTouchListener(this);
         View.inflate(getContext(), R.layout.per_app_fab_floating_window_icon, mDraggableIcon);
         mDraggableIconImage = mDraggableIcon.findViewById(R.id.box);
+        mDraggableIconImage.getViewTreeObserver().addOnWindowAttachListener(mWindowAttachListener);
         mParams = addView(mDraggableIcon, 0, 0);
         updateIconPosition(MARGIN_HORIZONTAL, STARTING_POINT_Y);
 
@@ -597,6 +599,28 @@ public class PerAppThemingWindow extends Service implements OnTouchListener,
         }
     };
 
+    private ViewTreeObserver.OnWindowAttachListener mWindowAttachListener =
+            new ViewTreeObserver.OnWindowAttachListener() {
+        @Override
+        public void onWindowAttached() {
+            // Remove the this OnWindowAttachListener now that we are done with it.
+            mDraggableIconImage.getViewTreeObserver().removeOnWindowAttachListener(this);
+
+            final float fabWidth = getResources().getDimension(R.dimen.floating_window_icon);
+            mDraggableIconImage.setAlpha(0);
+            mDraggableIconImage.setX(-fabWidth);
+            mDraggableIconImage.animate()
+                    .alpha(1f)
+                    .xBy(fabWidth)
+                    .setDuration(ANIMATION_DURATION)
+                    .start();
+        }
+
+        @Override
+        public void onWindowDetached() {
+        }
+    };
+
     private void showThemeList(final int listSide) {
         if (mListLayoutParams == null) {
             mListLayoutParams = new WindowManager.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,