From 5e4370b5de1347909d514e279e1aada582458820 Mon Sep 17 00:00:00 2001
From: Andrey Epin <ayepin@google.com>
Date: Tue, 1 Aug 2023 14:44:48 -0700
Subject: Make preview scrollable under a feature flag.

Base feature implementation controlled by a flag. A few issues are known
and will be addressed separately.
Known issues:
 * No (dis)appearance animation for the A-Z targets divider bar.

Bug: 287102904
Test: Enabled the flag programmatically and test the new functionality.
 Manually test for possible regressions with the unset flag.
Test: atest com.android.intentresolver.contentpreview
Test: atest IntentResolverUnitTests:UnbundledChooserActivityTest

Change-Id: I8273cf365a1e00b1acff4030086f1a044ad7531f
---
 .../res/layout/chooser_grid_scrollable_preview.xml | 128 +++++++++++++++++++++
 java/res/layout/chooser_list_per_profile_wrap.xml  |  42 +++++++
 java/res/values/attrs.xml                          |   5 +
 3 files changed, 175 insertions(+)
 create mode 100644 java/res/layout/chooser_grid_scrollable_preview.xml
 create mode 100644 java/res/layout/chooser_list_per_profile_wrap.xml

(limited to 'java/res')

diff --git a/java/res/layout/chooser_grid_scrollable_preview.xml b/java/res/layout/chooser_grid_scrollable_preview.xml
new file mode 100644
index 00000000..a5ac75a2
--- /dev/null
+++ b/java/res/layout/chooser_grid_scrollable_preview.xml
@@ -0,0 +1,128 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+* Copyright 2015, 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.intentresolver.widget.ResolverDrawerLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_gravity="center"
+    app:maxCollapsedHeight="0dp"
+    app:maxCollapsedHeightSmall="56dp"
+    app:useScrollablePreviewNestedFlingLogic="true"
+    android:maxWidth="@dimen/chooser_width"
+    android:id="@androidprv:id/contentPanel">
+
+    <RelativeLayout
+        android:id="@androidprv:id/chooser_header"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_alwaysShow="true"
+        android:elevation="0dp"
+        android:background="@drawable/bottomsheet_background">
+
+        <View
+            android:id="@androidprv:id/drag"
+            android:layout_width="64dp"
+            android:layout_height="4dp"
+            android:background="@drawable/ic_drag_handle"
+            android:layout_marginTop="@dimen/chooser_edge_margin_thin"
+            android:layout_marginBottom="@dimen/chooser_edge_margin_thin"
+            android:layout_centerHorizontal="true"
+            android:layout_alignParentTop="true" />
+
+        <TextView android:id="@android:id/title"
+                  android:layout_height="wrap_content"
+                  android:layout_width="wrap_content"
+                  android:textAppearance="@android:style/TextAppearance.DeviceDefault.WindowTitle"
+                  android:gravity="center"
+                  android:paddingBottom="@dimen/chooser_view_spacing"
+                  android:paddingLeft="24dp"
+                  android:paddingRight="24dp"
+                  android:visibility="gone"
+                  android:layout_below="@androidprv:id/drag"
+                  android:layout_centerHorizontal="true"/>
+    </RelativeLayout>
+
+    <FrameLayout
+        android:id="@+id/chooser_headline_row_container"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layout_alwaysShow="true"
+        android:background="?androidprv:attr/materialColorSurfaceContainer">
+
+        <ViewStub
+            android:id="@+id/chooser_headline_row_stub"
+            android:inflatedId="@+id/chooser_headline_row"
+            android:layout="@layout/chooser_headline_row"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingHorizontal="@dimen/chooser_edge_margin_normal"
+            android:layout_marginBottom="@dimen/chooser_view_spacing" />
+    </FrameLayout>
+
+    <com.android.intentresolver.widget.ChooserNestedScrollView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical"
+            android:background="#f00">
+
+            <FrameLayout
+                android:id="@androidprv:id/content_preview_container"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:visibility="gone" />
+
+            <TabHost
+                android:id="@androidprv:id/profile_tabhost"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_alignParentTop="true"
+                android:layout_centerHorizontal="true"
+                android:background="?androidprv:attr/materialColorSurfaceContainer">
+                <LinearLayout
+                    android:orientation="vertical"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content">
+                    <TabWidget
+                        android:id="@android:id/tabs"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content"
+                        android:visibility="gone">
+                    </TabWidget>
+                    <FrameLayout
+                        android:id="@android:id/tabcontent"
+                        android:layout_width="match_parent"
+                        android:layout_height="wrap_content">
+                        <com.android.intentresolver.ResolverViewPager
+                            android:id="@androidprv:id/profile_pager"
+                            android:layout_width="match_parent"
+                            android:layout_height="wrap_content"/>
+                    </FrameLayout>
+                </LinearLayout>
+            </TabHost>
+    </LinearLayout>
+
+    </com.android.intentresolver.widget.ChooserNestedScrollView>
+
+</com.android.intentresolver.widget.ResolverDrawerLayout>
diff --git a/java/res/layout/chooser_list_per_profile_wrap.xml b/java/res/layout/chooser_list_per_profile_wrap.xml
new file mode 100644
index 00000000..157fa75d
--- /dev/null
+++ b/java/res/layout/chooser_list_per_profile_wrap.xml
@@ -0,0 +1,42 @@
+<!--
+  ~ 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.
+  -->
+<RelativeLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:descendantFocusability="blocksDescendants">
+    <!--    ^^^ Block descendants from receiving focus to prevent NestedScrollView
+    (ChooserNestedScrollView) scrolling to the focused view when switching tabs. Without it, TabHost
+    view will request focus on the newly activated tab. The RecyclerView from this layout gets
+    focused and  notifies its parents (including NestedScrollView) about it through
+    #requestChildFocus method call. NestedScrollView's view implementation of the method  will
+    scroll to the focused view. -->
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:layoutManager="com.android.intentresolver.ChooserGridLayoutManager"
+        android:id="@androidprv:id/resolver_list"
+        android:clipToPadding="false"
+        android:background="?androidprv:attr/materialColorSurfaceContainer"
+        android:scrollbars="none"
+        android:elevation="1dp"
+        android:nestedScrollingEnabled="true" />
+
+    <include layout="@layout/resolver_empty_states" />
+</RelativeLayout>
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 67acb3ae..c9f2c300 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -32,6 +32,11 @@
              will push all ignoreOffset siblings below it when the drawer is moved i.e. setting the
              top limit the ignoreOffset elements. -->
         <attr name="ignoreOffsetTopLimit" format="reference" />
+        <!-- Specifies whether ResolverDrawerLayout should use an alternative nested fling logic
+        adjusted for the scrollable preview feature.
+        Controlled by the flag com.android.intentresolver.Flags#FLAG_SCROLLABLE_PREVIEW.
+        -->
+        <attr name="useScrollablePreviewNestedFlingLogic" format="boolean" />
     </declare-styleable>
 
     <declare-styleable name="ResolverDrawerLayout_LayoutParams">
-- 
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