From 7a7fd761510b94c42a51bb654de74b0ea8d496da Mon Sep 17 00:00:00 2001
From: Lucas Dupin <dupin@google.com>
Date: Sun, 17 May 2020 22:03:48 -0700
Subject: [PATCH] Make media buttons shrink when tapped

We already illuminate the background, but a small scale animation
when tapping makes it feel a bit more polished.

Bug: 155796337
Test: manual
Change-Id: I5ec186af10cb6651a6c23addecae02845b6e18ac
---
 .../anim/media_button_state_list_animator.xml | 50 +++++++++++++++++++
 packages/SystemUI/res/values/styles.xml       |  1 +
 2 files changed, 51 insertions(+)
 create mode 100644 packages/SystemUI/res/anim/media_button_state_list_animator.xml

diff --git a/packages/SystemUI/res/anim/media_button_state_list_animator.xml b/packages/SystemUI/res/anim/media_button_state_list_animator.xml
new file mode 100644
index 0000000000000..62ebbaa112ea2
--- /dev/null
+++ b/packages/SystemUI/res/anim/media_button_state_list_animator.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2020 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~      http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_pressed="true">
+        <set>
+            <objectAnimator
+                android:interpolator="@interpolator/control_state"
+                android:duration="50"
+                android:propertyName="scaleX"
+                android:valueTo="0.9"
+                android:valueType="floatType" />
+            <objectAnimator
+                android:interpolator="@interpolator/control_state"
+                android:duration="50"
+                android:propertyName="scaleY"
+                android:valueTo="0.9"
+                android:valueType="floatType" />
+        </set>
+    </item>
+    <item>
+        <set>
+            <objectAnimator
+                android:interpolator="@interpolator/control_state"
+                android:duration="250"
+                android:propertyName="scaleX"
+                android:valueTo="1"
+                android:valueType="floatType" />
+            <objectAnimator
+                android:interpolator="@interpolator/control_state"
+                android:duration="250"
+                android:propertyName="scaleY"
+                android:valueTo="1"
+                android:valueType="floatType" />
+        </set>
+    </item>
+</selector>
\ No newline at end of file
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index b461295dc3842..4f42370483c46 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -623,6 +623,7 @@
     <style name="MediaPlayer.Button" parent="@android:style/Widget.Material.Button.Borderless.Small">
         <item name="android:background">@null</item>
         <item name="android:tint">@android:color/white</item>
+        <item name="android:stateListAnimator">@anim/media_button_state_list_animator</item>
     </style>
 
     <!-- Used to style charging animation AVD animation -->