Add focus ring to widgets header

Change the widgets header drawable to be a selector with the
state_focused property in addition to the state_expanded property. The
focused items are drawn with a focus ring with no ripple, while the
unfocused items have a ripple.

Bug: 365120324
Test: focus traversal through left widget picker pane
Flag: EXEMPT bug fix
Change-Id: I710cb9e2d727a061e0c19df15526e8c832f6366b
diff --git a/res/drawable/bg_widgets_header_states_two_pane.xml b/res/drawable/bg_widgets_header_states_two_pane.xml
index 5f4b8c6..1ec41a9 100644
--- a/res/drawable/bg_widgets_header_states_two_pane.xml
+++ b/res/drawable/bg_widgets_header_states_two_pane.xml
@@ -14,18 +14,16 @@
      limitations under the License.
 -->
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <item android:state_expanded="true">
-        <shape android:shape="rectangle">
-            <solid android:color="?attr/widgetPickerHeaderBackgroundColor" />
-            <corners android:radius="@dimen/widget_list_top_bottom_corner_radius" />
-        </shape>
+    <item android:state_expanded="true" android:state_focused="false">
+        <ripple android:color="@color/accent_ripple_color">
+            <item android:drawable="@drawable/bg_widgets_header_two_pane_expanded_unfocused" />
+        </ripple>
     </item>
-
-    <item android:state_expanded="false">
-        <shape android:shape="rectangle">
-            <solid android:color="@android:color/transparent" />
-            <corners android:radius="@dimen/widget_list_top_bottom_corner_radius" />
-        </shape>
+    <item android:state_expanded="false" android:state_focused="false">
+        <ripple android:color="@color/accent_ripple_color">
+            <item android:drawable="@drawable/bg_widgets_header_two_pane_unexpanded_unfocused" />
+        </ripple>
     </item>
+    <item android:drawable="@drawable/bg_widgets_header_two_pane_expanded_focused" android:state_expanded="true" android:state_focused="true" />
+    <item android:drawable="@drawable/bg_widgets_header_two_pane_unexpanded_focused" android:state_expanded="false" android:state_focused="true" />
 </selector>
diff --git a/res/drawable/bg_widgets_header_two_pane.xml b/res/drawable/bg_widgets_header_two_pane.xml
index ca3feef..e237002 100644
--- a/res/drawable/bg_widgets_header_two_pane.xml
+++ b/res/drawable/bg_widgets_header_two_pane.xml
@@ -14,13 +14,10 @@
      limitations under the License.
 -->
 <inset xmlns:android="http://schemas.android.com/apk/res/android"
-    android:insetTop="@dimen/widget_list_entry_spacing" >
-    <ripple
-        android:color="@color/accent_ripple_color"
-        android:paddingTop="@dimen/widget_list_header_view_vertical_padding"
-        android:paddingBottom="@dimen/widget_list_header_view_vertical_padding" >
-        <item android:id="@android:id/mask"
-            android:drawable="@drawable/bg_widgets_header_states_two_pane" />
+    android:insetTop="@dimen/widget_list_entry_spacing">
+    <layer-list
+        android:paddingBottom="@dimen/widget_list_header_view_vertical_padding"
+        android:paddingTop="@dimen/widget_list_header_view_vertical_padding">
         <item android:drawable="@drawable/bg_widgets_header_states_two_pane" />
-    </ripple>
-</inset>
+    </layer-list>
+</inset>
\ No newline at end of file
diff --git a/res/drawable/bg_widgets_header_two_pane_expanded_focused.xml b/res/drawable/bg_widgets_header_two_pane_expanded_focused.xml
new file mode 100644
index 0000000..0ee3d14
--- /dev/null
+++ b/res/drawable/bg_widgets_header_two_pane_expanded_focused.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2024 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.
+  -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Draw the focus ring -->
+    <item>
+        <shape>
+            <corners android:radius="@dimen/widget_focus_ring_corner_radius" />
+            <stroke
+                android:width="@dimen/widget_header_focus_ring_width"
+                android:color="?attr/widgetPickerTabBackgroundSelected" />
+        </shape>
+    </item>
+
+    <!-- Draw the background with padding to make it spaced within the focus ring. -->
+    <item
+        android:bottom="@dimen/widget_header_background_border"
+        android:end="@dimen/widget_header_background_border"
+        android:start="@dimen/widget_header_background_border"
+        android:top="@dimen/widget_header_background_border">
+        <shape android:shape="rectangle">
+            <corners android:radius="@dimen/widget_list_top_bottom_corner_radius" />
+            <solid android:color="?attr/widgetPickerHeaderBackgroundColor" />
+        </shape>
+    </item>
+</layer-list>
\ No newline at end of file
diff --git a/res/drawable/bg_widgets_header_two_pane_expanded_unfocused.xml b/res/drawable/bg_widgets_header_two_pane_expanded_unfocused.xml
new file mode 100644
index 0000000..9028ebe
--- /dev/null
+++ b/res/drawable/bg_widgets_header_two_pane_expanded_unfocused.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2024 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.
+  -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
+    android:paddingBottom="@dimen/widget_list_header_view_vertical_padding"
+    android:paddingTop="@dimen/widget_list_header_view_vertical_padding">
+    <item>
+        <shape android:shape="rectangle">
+            <corners android:radius="@dimen/widget_list_top_bottom_corner_radius" />
+            <solid android:color="?attr/widgetPickerHeaderBackgroundColor" />
+        </shape>
+    </item>
+</layer-list>
\ No newline at end of file
diff --git a/res/drawable/bg_widgets_header_two_pane_unexpanded_focused.xml b/res/drawable/bg_widgets_header_two_pane_unexpanded_focused.xml
new file mode 100644
index 0000000..12dc907
--- /dev/null
+++ b/res/drawable/bg_widgets_header_two_pane_unexpanded_focused.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2024 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.
+  -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Draw the focus ring and a transparent background -->
+    <item>
+        <shape>
+            <corners android:radius="@dimen/widget_focus_ring_corner_radius" />
+            <solid android:color="@android:color/transparent" />
+            <stroke
+                android:width="@dimen/widget_header_focus_ring_width"
+                android:color="?attr/widgetPickerTabBackgroundSelected" />
+        </shape>
+    </item>
+</layer-list>
\ No newline at end of file
diff --git a/res/drawable/bg_widgets_header_two_pane_unexpanded_unfocused.xml b/res/drawable/bg_widgets_header_two_pane_unexpanded_unfocused.xml
new file mode 100644
index 0000000..ba26f9f
--- /dev/null
+++ b/res/drawable/bg_widgets_header_two_pane_unexpanded_unfocused.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright (C) 2024 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.
+  -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="rectangle">
+            <corners android:radius="@dimen/widget_list_top_bottom_corner_radius" />
+            <solid android:color="@android:color/transparent" />
+        </shape>
+    </item>
+</layer-list>
\ No newline at end of file
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 037687d..c225cd5 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -225,6 +225,10 @@
     <!-- Bottom margin for the search and recommended widgets container with work profile -->
     <dimen name="search_and_recommended_widgets_container_small_bottom_margin">10dp</dimen>
 
+    <dimen name="widget_header_focus_ring_width">3dp</dimen>
+    <dimen name="widget_focus_ring_corner_radius">28dp</dimen>
+    <dimen name="widget_header_background_border">5dp</dimen>
+
     <dimen name="widget_list_top_bottom_corner_radius">28dp</dimen>
     <dimen name="widget_list_content_corner_radius">4dp</dimen>