Move the leanback alert dialog buttons to the left.

Bug: 179343577
Bug: 156105237
Test: manual
Change-Id: Ide1763780806deb881db758b64e66db08f0f1054

core/res/res/layout/alert_dialog_button_bar_leanback.xml

@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 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.
+-->
+
+<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
+            android:id="@+id/buttonPanel"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:scrollbarAlwaysDrawVerticalTrack="true"
+            android:scrollIndicators="top|bottom"
+            android:fillViewport="true"
+            style="?attr/buttonBarStyle">
+    <com.android.internal.widget.ButtonBarLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layoutDirection="locale"
+        android:orientation="horizontal"
+        android:gravity="start">
+
+        <Button
+            android:id="@+id/button1"
+            style="?attr/buttonBarPositiveButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
+
+        <Button
+            android:id="@+id/button2"
+            style="?attr/buttonBarNegativeButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
+
+        <Space
+            android:id="@+id/spacer"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:visibility="invisible" />
+
+        <Button
+            android:id="@+id/button3"
+            style="?attr/buttonBarNeutralButtonStyle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content" />
+
+    </com.android.internal.widget.ButtonBarLayout>
+</ScrollView>

core/res/res/layout/alert_dialog_leanback.xml

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 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.
+-->
+
+<com.android.internal.widget.AlertDialogLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/parentPanel"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:gravity="start|top"
+    android:orientation="vertical">
+
+    <include layout="@layout/alert_dialog_title_material" />
+
+    <FrameLayout
+        android:id="@+id/contentPanel"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:minHeight="48dp">
+
+        <ScrollView
+            android:id="@+id/scrollView"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:clipToPadding="false">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="vertical">
+
+                <Space
+                    android:id="@+id/textSpacerNoTitle"
+                    android:visibility="gone"
+                    android:layout_width="match_parent"
+                    android:layout_height="@dimen/dialog_padding_top_material" />
+
+                <TextView
+                    android:id="@+id/message"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:paddingEnd="?attr/dialogPreferredPadding"
+                    android:paddingStart="?attr/dialogPreferredPadding"
+                    style="@style/TextAppearance.Material.Subhead" />
+
+                <Space
+                    android:id="@+id/textSpacerNoButtons"
+                    android:visibility="gone"
+                    android:layout_width="match_parent"
+                    android:layout_height="@dimen/dialog_padding_top_material" />
+            </LinearLayout>
+        </ScrollView>
+    </FrameLayout>
+
+    <FrameLayout
+        android:id="@+id/customPanel"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:minHeight="48dp">
+
+        <FrameLayout
+            android:id="@+id/custom"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+    </FrameLayout>
+
+    <include
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        layout="@layout/alert_dialog_button_bar_leanback" />
+</com.android.internal.widget.AlertDialogLayout>

core/res/res/values/styles_leanback.xml

@@ -16,6 +16,7 @@
 <resources>
     <style name="AlertDialog.Leanback" parent="AlertDialog.Material">
         <item name="buttonPanelSideLayout">@android:layout/alert_dialog_leanback_button_panel_side</item>
+        <item name="layout">@android:layout/alert_dialog_leanback</item>
     </style>
 
     <style name="AlertDialog.Leanback.Light">
@@ -35,6 +36,10 @@
         <item name="android:layout_marginStart">10dp</item>
     </style>
 
+    <style name="Widget.Leanback.Button.ButtonBarGravityStart" parent="Widget.Leanback.Button">
+        <item name="android:layout_marginEnd">10dp</item>
+    </style>
+
     <style name="Widget.Leanback.ButtonBar" parent="Widget.Material.ButtonBar">
         <item name="android:padding">?android:attr/dialogPreferredPadding</item>
     </style>

core/res/res/values/themes_leanback.xml

@@ -22,7 +22,7 @@
       <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
       <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
       <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
       <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>
 
@@ -34,7 +34,7 @@
       <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
       <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
       <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
       <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>
 
@@ -46,7 +46,7 @@
         <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
         <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
         <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
         <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>
 
@@ -58,7 +58,7 @@
       <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
       <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
       <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
       <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>
 
@@ -70,7 +70,7 @@
       <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
       <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
       <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-      <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
       <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>
 
@@ -82,7 +82,7 @@
         <item name="timePickerStyle">@style/Widget.Leanback.TimePicker</item>
         <item name="datePickerStyle">@style/Widget.Leanback.DatePicker</item>
         <item name="numberPickerStyle">@style/Widget.Leanback.NumberPicker</item>
-        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBar</item>
+        <item name="buttonBarButtonStyle">@style/Widget.Leanback.Button.ButtonBarGravityStart</item>
         <item name="buttonBarStyle">@style/Widget.Leanback.ButtonBar</item>
     </style>