Add preview checkbox for LivePicker

Enable preview checkbox to hide bottom panel, otherwise to show it.
Default behavior will show bottom panel with preview unchecked.

Bug: 130383883
Test: Manual Test

Change-Id: Ida5a5fa7ece501aefd906b70b6990eb89fe14c74

6 files changed, 61 insertions, 37 deletions

diff --git a/res/layout/live_wallpaper_preview.xml b/res/layout/live_wallpaper_preview.xml
index 0c35b68..b6bbd7c 100644
--- a/res/layout/live_wallpaper_preview.xml
+++ b/res/layout/live_wallpaper_preview.xml
@@ -46,29 +46,37 @@
         android:layout_height="match_parent"
         android:fitsSystemWindows="true">
 
-        <LinearLayout
-            android:id="@+id/bottom_pane"
+        <androidx.coordinatorlayout.widget.CoordinatorLayout
+            android:id="@+id/coordinator_layout"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_gravity="bottom"
-            android:background="@color/translucent_black"
             android:orientation="vertical">
 
-            <com.google.android.material.tabs.TabLayout
-                android:id="@+id/tablayout"
+            <LinearLayout
+                android:id="@+id/bottom_pane"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                style="@style/TabLayoutStyle"
-                android:visibility="gone" />
+                android:background="@color/translucent_black"
+                android:orientation="vertical"
+                app:behavior_peekHeight="@dimen/preview_attribution_pane_collapsed_height"
+                app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
 
-            <com.android.wallpaper.livepicker.widget.ConstraintViewPager
-                android:id="@+id/viewpager"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content">
+                <com.google.android.material.tabs.TabLayout
+                    android:id="@+id/tablayout"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    style="@style/TabLayoutStyle"
+                    android:visibility="gone"/>
+
+                <com.android.wallpaper.livepicker.widget.ConstraintViewPager
+                    android:id="@+id/viewpager"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"/>
 
-            </com.android.wallpaper.livepicker.widget.ConstraintViewPager>
+            </LinearLayout>
 
-        </LinearLayout>
+        </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
         <android.widget.Toolbar
             android:id="@+id/toolbar"
diff --git a/res/layout/preview_action.xml b/res/layout/preview_action.xml
new file mode 100644
index 0000000..89a3c9e
--- /dev/null
+++ b/res/layout/preview_action.xml
@@ -0,0 +1,24 @@
+<!-- Copyright (C) 2019 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.
+-->
+
+<CheckBox
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    style="?android:attr/checkboxStyle"
+    android:layout_width="wrap_content"
+    android:layout_height="match_parent"
+    android:text="@string/preview"
+    android:textAllCaps="false"
+    android:textAppearance="?android:attr/actionMenuTextAppearance"
+    android:background="?android:attr/selectableItemBackgroundBorderless"/>
diff --git a/res/layout/set_wallpaper_action.xml b/res/layout/set_wallpaper_action.xml
deleted file mode 100644
index 02f4fcd..0000000
--- a/res/layout/set_wallpaper_action.xml
+++ /dev/null
@@ -1,24 +0,0 @@
-<!--
-  ~ Copyright (C) 2016 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
-  -->
-
-<Button
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    style="?android:attr/actionButtonStyle"
-    android:layout_width="wrap_content"
-    android:layout_height="match_parent"
-    android:text="@string/set_live_wallpaper"
-    android:textAppearance="?android:attr/actionMenuTextAppearance"
-    android:background="?android:attr/selectableItemBackgroundBorderless"/>
\ No newline at end of file
diff --git a/res/menu/menu_preview.xml b/res/menu/menu_preview.xml
index c8d450a..183ffd4 100644
--- a/res/menu/menu_preview.xml
+++ b/res/menu/menu_preview.xml
@@ -16,6 +16,11 @@
 -->
 <menu xmlns:android="http://schemas.android.com/apk/res/android" >
 
+    <item android:id="@+id/preview"
+          android:checkable="true"
+          android:showAsAction="ifRoom"
+          android:actionLayout="@layout/preview_action"/>
+
     <item
         android:id="@+id/configure"
         android:icon="@drawable/ic_settings"
diff --git a/res/values/dimensions.xml b/res/values/dimensions.xml
index 85ce7db..a1ccd3f 100644
--- a/res/values/dimensions.xml
+++ b/res/values/dimensions.xml
@@ -33,6 +33,7 @@
     <dimen name="preview_gradient_background_height">256dp</dimen>
 
     <!-- Dimensions for the preview attribution pane. -->
+    <dimen name="preview_attribution_pane_collapsed_height">0dp</dimen>
     <dimen name="preview_attribution_pane_horizontal_padding">24dp</dimen>
     <dimen name="preview_attribution_pane_extra_spacer_height">16dp</dimen>
     <dimen name="preview_attribution_pane_inner_spacer_height">14dp</dimen>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 824c23b..4ade992 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -33,6 +33,8 @@
     <string name="configure_wallpaper">Settings…</string>
     <!-- List item for deleting the current wallpaper -->
     <string name="delete_live_wallpaper">Delete</string>
+    <!-- List item for showing the current wallpaper by hiding bottom panel. -->
+    <string name="preview">Preview</string>
     <!-- Button label on Wallpaper Gallery screen; user selects this button to set a specific wallpaper -->
     <string name="wallpaper_instructions">Set wallpaper</string>
     <!-- Warning message, no live wallpapers available. -->
@@ -61,4 +63,12 @@
 
     <!-- Confirmation dialog. Shown after user selects to delete one wallpaper. [CHAR LIMIT=NONE]  -->
     <string name="delete_wallpaper_confirmation">Delete this wallpaper from your phone?</string>
+
+    <!-- Content description for a checkbox letting the user collapse a visual panel showing info
+         about the wallpaper being previewed. [CHAR LIMIT=none] -->
+    <string name="collapse_attribution_panel">Collapse wallpaper info panel</string>
+
+    <!-- Content description for a checkbox letting the user expand a visual panel showing info
+         about the wallpaper being previewed. [CHAR LIMIT=none] -->
+    <string name="expand_attribution_panel">Expand wallpaper info panel</string>
 </resources>