Add background blur to tv volume dialog

Bug: 182905790
Test: m && check volume dialog appears as expected
Test: disable blur with 'adb shell wm disable-blur 1' and check volume
      control ui switches to fallback non-blurry variant
Change-Id: Icd0897bb33bf5d929a43d26df2ba64cbf4eb0267

packages/SystemUI/res/drawable/tv_volume_dialog_background.xml

@@ -18,7 +18,7 @@
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
 
-  <solid android:color="@color/tv_volume_dialog_background" />
-  <corners android:radius="@dimen/tv_volume_dialog_corner_radius"/>
+  <solid android:color="@color/volume_dialog_background_color" />
+  <corners android:radius="?android:attr/dialogCornerRadius"/>
 
 </shape>

packages/SystemUI/res/layout-land-television/volume_dialog.xml

@@ -40,14 +40,15 @@
             android:translationZ="@dimen/volume_dialog_elevation"
             android:clipChildren="false"
             android:clipToPadding="false"
-            android:background="@drawable/tv_volume_dialog_background">
+            android:background="@android:color/transparent">
 
             <LinearLayout
                 android:id="@+id/volume_dialog_rows"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:gravity="center"
-                android:orientation="horizontal">
+                android:orientation="horizontal"
+                android:background="@drawable/tv_volume_dialog_background">
                 <!-- volume rows added and removed here! :-) -->
             </LinearLayout>
 

packages/SystemUI/res/values-land-television/dimens.xml

@@ -22,9 +22,9 @@
   <dimen name="volume_dialog_panel_transparent_padding">24dp</dimen>
   <dimen name="volume_dialog_slider_width">4dp</dimen>
   <dimen name="volume_dialog_slider_corner_radius">@dimen/volume_dialog_slider_width</dimen>
+  <dimen name="volume_dialog_background_blur_radius">100dp</dimen>
 
   <dimen name="tv_volume_dialog_bubble_size">36dp</dimen>
-  <dimen name="tv_volume_dialog_corner_radius">36dp</dimen>
   <dimen name="tv_volume_dialog_row_padding">6dp</dimen>
   <dimen name="tv_volume_number_text_size">16sp</dimen>
   <dimen name="tv_volume_seek_bar_thumb_diameter">24dp</dimen>

packages/SystemUI/res/values-television/colors.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * Copyright 2021, 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.
+ */
+-->
+<resources>
+    <color name="volume_dialog_background_color">#E61F232B</color>
+    <color name="volume_dialog_background_color_above_blur">#C71F232B</color>
+</resources>

packages/SystemUI/res/values-television/config.xml

@@ -60,4 +60,7 @@
 
     <!-- The duraction of the hide animation for the volume dialog in milliseconds -->
     <integer name="config_dialogHideAnimationDurationMs">400</integer>
+
+    <!-- Whether to use window background blur for the volume dialog. -->
+    <bool name="config_volumeDialogUseBackgroundBlur">true</bool>
 </resources>

packages/SystemUI/res/values-television/styles.xml

@@ -25,5 +25,6 @@
 
     <style name="volume_dialog_theme" parent="qs_theme">
         <item name="android:colorAccent">@color/tv_volume_dialog_accent</item>
+        <item name="android:dialogCornerRadius">@dimen/volume_dialog_panel_width_half</item>
     </style>
 </resources>

packages/SystemUI/res/values/colors.xml

@@ -243,6 +243,10 @@
     <color name="magnification_border_color">#FF9900</color>
     <color name="magnification_switch_button_color">#7F000000</color>
 
+    <!-- Volume dialog colors -->
+    <color name="volume_dialog_background_color">@android:color/transparent</color>
+    <color name="volume_dialog_background_color_above_blur">@android:color/transparent</color>
+
     <!-- media -->
     <color name="media_disabled">#80ffffff</color>
     <color name="media_seamless_border">?android:attr/colorAccent</color>

packages/SystemUI/res/values/colors_tv.xml

@@ -26,7 +26,6 @@
     <color name="tv_audio_recording_indicator_stroke">#33FFFFFF</color>
 
     <color name="red">#FFCC0000</color>
-    <color name="tv_volume_dialog_background">#E61F232B</color>
     <color name="tv_volume_dialog_circle">#08FFFFFF</color>
     <color name="tv_volume_dialog_seek_thumb_focus_ring">#1AFFFFFF</color>
     <color name="tv_volume_dialog_seek_thumb_shadow">#40000000</color>

packages/SystemUI/res/values/config.xml

@@ -599,4 +599,7 @@
     <!-- Whether a transition of ACTIVITY_TYPE_ASSISTANT to the home app should play a home sound
          effect -->
     <bool name="config_playHomeSoundAfterAssistant">false</bool>
+
+    <!-- Whether to use window background blur for the volume dialog. -->
+    <bool name="config_volumeDialogUseBackgroundBlur">false</bool>
 </resources>

packages/SystemUI/res/values/dimens.xml

@@ -484,6 +484,8 @@
 
     <dimen name="volume_dialog_elevation">9dp</dimen>
 
+    <dimen name="volume_dialog_background_blur_radius">0dp</dimen>
+
     <dimen name="volume_tool_tip_right_margin">76dp</dimen>
 
     <dimen name="volume_tool_tip_bottom_margin">32dp</dimen>

packages/SystemUI/src/com/android/systemui/volume/VolumeDialogImpl.java

@@ -76,6 +76,7 @@ import android.view.ContextThemeWrapper;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.AccessibilityDelegate;
+import android.view.View.OnAttachStateChangeListener;
 import android.view.ViewGroup;
 import android.view.ViewPropertyAnimator;
 import android.view.ViewStub;
@@ -95,6 +96,7 @@ import android.widget.SeekBar.OnSeekBarChangeListener;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.android.internal.graphics.drawable.BackgroundBlurDrawable;
 import com.android.settingslib.Utils;
 import com.android.systemui.Dependency;
 import com.android.systemui.Interpolators;
@@ -115,6 +117,7 @@ import com.android.systemui.util.RoundedCornerProgressDrawable;
 import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.Consumer;
 
 /**
  * Visual presentation of the volume dialog.
@@ -214,6 +217,10 @@ public class VolumeDialogImpl implements VolumeDialog,
     private ViewStub mODICaptionsTooltipViewStub;
     private View mODICaptionsTooltipView = null;
 
+    private final boolean mUseBackgroundBlur;
+    private Consumer<Boolean> mCrossWindowBlurEnabledListener;
+    private BackgroundBlurDrawable mDialogRowsViewBackground;
+
     public VolumeDialogImpl(Context context) {
         mContext =
                 new ContextThemeWrapper(context, R.style.volume_dialog_theme);
@@ -233,6 +240,20 @@ public class VolumeDialogImpl implements VolumeDialog,
             mContext.getResources().getInteger(R.integer.config_dialogShowAnimationDurationMs);
         mDialogHideAnimationDurationMs =
             mContext.getResources().getInteger(R.integer.config_dialogHideAnimationDurationMs);
+        mUseBackgroundBlur =
+            mContext.getResources().getBoolean(R.bool.config_volumeDialogUseBackgroundBlur);
+
+        if (mUseBackgroundBlur) {
+            final int dialogRowsViewColorAboveBlur = mContext.getColor(
+                    R.color.volume_dialog_background_color_above_blur);
+            final int dialogRowsViewColorNoBlur = mContext.getColor(
+                    R.color.volume_dialog_background_color);
+            mCrossWindowBlurEnabledListener = (enabled) -> {
+                mDialogRowsViewBackground.setColor(
+                        enabled ? dialogRowsViewColorAboveBlur : dialogRowsViewColorNoBlur);
+                mDialogRowsView.invalidate();
+            };
+        }
         mRingerDrawerItemSize = mContext.getResources().getDimensionPixelSize(
                 R.dimen.volume_ringer_drawer_item_size);
         mShowVibrate = mController.hasVibrator();
@@ -356,6 +377,32 @@ public class VolumeDialogImpl implements VolumeDialog,
         });
 
         mDialogRowsView = mDialog.findViewById(R.id.volume_dialog_rows);
+        if (mUseBackgroundBlur) {
+            mDialogView.addOnAttachStateChangeListener(new OnAttachStateChangeListener() {
+                @Override
+                public void onViewAttachedToWindow(View v) {
+                    mWindow.getWindowManager().addCrossWindowBlurEnabledListener(
+                            mCrossWindowBlurEnabledListener);
+
+                    mDialogRowsViewBackground = v.getViewRootImpl().createBackgroundBlurDrawable();
+
+                    final Resources resources = mContext.getResources();
+                    mDialogRowsViewBackground.setCornerRadius(
+                            mContext.getResources().getDimensionPixelSize(Utils.getThemeAttr(
+                                    mContext, android.R.attr.dialogCornerRadius)));
+                    mDialogRowsViewBackground.setBlurRadius(resources.getDimensionPixelSize(
+                            R.dimen.volume_dialog_background_blur_radius));
+                    mDialogRowsView.setBackground(mDialogRowsViewBackground);
+                }
+
+                @Override
+                public void onViewDetachedFromWindow(View v) {
+                    mWindow.getWindowManager().removeCrossWindowBlurEnabledListener(
+                            mCrossWindowBlurEnabledListener);
+                }
+            });
+        }
+
         mRinger = mDialog.findViewById(R.id.ringer);
         if (mRinger != null) {
             mRingerIcon = mRinger.findViewById(R.id.ringer_icon);