From e7401754295844df2b7e10f953160d96b2546a3a Mon Sep 17 00:00:00 2001
From: Fabian Kozynski <kozynski@google.com>
Date: Fri, 27 Aug 2021 14:20:29 -0400
Subject: [PATCH] New user switcher dialog

This dialog will eventually replace the UserDetailView. Right now, it
uses the same adapter to display the content (which is not necessarily
bad).

To enable:

1. `adb shell setprop persist.systemui.flag_new_user_switcher 1`
2. `adb shell am crash com.android.systemui`

Missing:
  * Red lines (including landscape size).
  * Bring user circles up to spec (once it's finalized).
  * Launch animations (to and from dialog).

Test: manual
Test: atest UserSwitchDialogControllerTest UserDialogTest
Bug: 185360864

Change-Id: I903d111822d1958fb53c43932b2df1393c841c71
---
 .../SystemUI/res/color/prv_color_surface.xml  |  20 ++
 .../res/color/prv_text_color_on_accent.xml    |  20 ++
 .../res/drawable/qs_dialog_btn_filled.xml     |  39 ++++
 .../res/drawable/qs_dialog_btn_outline.xml    |  42 ++++
 .../res/layout/qs_user_dialog_content.xml     |  89 ++++++++
 packages/SystemUI/res/values/attrs.xml        |   1 +
 packages/SystemUI/res/values/dimens.xml       |   5 +
 packages/SystemUI/res/values/flags.xml        |   2 +
 packages/SystemUI/res/values/styles.xml       |  33 +++
 .../android/systemui/flags/FeatureFlags.java  |   7 +
 .../android/systemui/qs/PseudoGridView.java   |  14 +-
 .../systemui/qs/tiles/UserDetailView.java     |  14 ++
 .../android/systemui/qs/user/UserDialog.kt    |  86 ++++++++
 .../qs/user/UserSwitchDialogController.kt     |  87 ++++++++
 .../phone/MultiUserSwitchController.java      |  25 ++-
 .../KeyguardQsUserSwitchController.java       |  16 +-
 .../systemui/qs/user/UserDialogTest.kt        |  62 ++++++
 .../qs/user/UserSwitchDialogControllerTest.kt | 203 ++++++++++++++++++
 18 files changed, 754 insertions(+), 11 deletions(-)
 create mode 100644 packages/SystemUI/res/color/prv_color_surface.xml
 create mode 100644 packages/SystemUI/res/color/prv_text_color_on_accent.xml
 create mode 100644 packages/SystemUI/res/drawable/qs_dialog_btn_filled.xml
 create mode 100644 packages/SystemUI/res/drawable/qs_dialog_btn_outline.xml
 create mode 100644 packages/SystemUI/res/layout/qs_user_dialog_content.xml
 create mode 100644 packages/SystemUI/src/com/android/systemui/qs/user/UserDialog.kt
 create mode 100644 packages/SystemUI/src/com/android/systemui/qs/user/UserSwitchDialogController.kt
 create mode 100644 packages/SystemUI/tests/src/com/android/systemui/qs/user/UserDialogTest.kt
 create mode 100644 packages/SystemUI/tests/src/com/android/systemui/qs/user/UserSwitchDialogControllerTest.kt

diff --git a/packages/SystemUI/res/color/prv_color_surface.xml b/packages/SystemUI/res/color/prv_color_surface.xml
new file mode 100644
index 0000000000000..b9d016c46ba0c
--- /dev/null
+++ b/packages/SystemUI/res/color/prv_color_surface.xml
@@ -0,0 +1,20 @@
+<?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.
+  -->
+<selector xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:color="?androidprv:attr/colorSurface" />
+</selector>
\ No newline at end of file
diff --git a/packages/SystemUI/res/color/prv_text_color_on_accent.xml b/packages/SystemUI/res/color/prv_text_color_on_accent.xml
new file mode 100644
index 0000000000000..9f44acadb420c
--- /dev/null
+++ b/packages/SystemUI/res/color/prv_text_color_on_accent.xml
@@ -0,0 +1,20 @@
+<?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.
+  -->
+<selector xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:color="?androidprv:attr/textColorOnAccent" />
+</selector>
\ No newline at end of file
diff --git a/packages/SystemUI/res/drawable/qs_dialog_btn_filled.xml b/packages/SystemUI/res/drawable/qs_dialog_btn_filled.xml
new file mode 100644
index 0000000000000..1a128dfe8b109
--- /dev/null
+++ b/packages/SystemUI/res/drawable/qs_dialog_btn_filled.xml
@@ -0,0 +1,39 @@
+<?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.
+  -->
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+       xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+       android:insetTop="@dimen/qs_dialog_button_vertical_inset"
+       android:insetBottom="@dimen/qs_dialog_button_vertical_inset">
+    <ripple android:color="?android:attr/colorControlHighlight">
+        <item android:id="@android:id/mask">
+            <shape android:shape="rectangle">
+                <solid android:color="@android:color/white"/>
+                <corners android:radius="?android:attr/buttonCornerRadius"/>
+            </shape>
+        </item>
+        <item>
+            <shape android:shape="rectangle">
+                <corners android:radius="?android:attr/buttonCornerRadius"/>
+                <solid android:color="?androidprv:attr/colorAccentPrimary"/>
+                <padding android:left="@dimen/qs_dialog_button_horizontal_padding"
+                         android:top="@dimen/qs_dialog_button_vertical_padding"
+                         android:right="@dimen/qs_dialog_button_horizontal_padding"
+                         android:bottom="@dimen/qs_dialog_button_vertical_padding"/>
+            </shape>
+        </item>
+    </ripple>
+</inset>
diff --git a/packages/SystemUI/res/drawable/qs_dialog_btn_outline.xml b/packages/SystemUI/res/drawable/qs_dialog_btn_outline.xml
new file mode 100644
index 0000000000000..467c20f3ffcd0
--- /dev/null
+++ b/packages/SystemUI/res/drawable/qs_dialog_btn_outline.xml
@@ -0,0 +1,42 @@
+<?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.
+  -->
+<inset xmlns:android="http://schemas.android.com/apk/res/android"
+       xmlns:androidprv="http://schemas.android.com/apk/prv/res/android"
+       android:insetTop="@dimen/qs_dialog_button_vertical_inset"
+       android:insetBottom="@dimen/qs_dialog_button_vertical_inset">
+    <ripple android:color="?android:attr/colorControlHighlight">
+        <item android:id="@android:id/mask">
+            <shape android:shape="rectangle">
+                <solid android:color="@android:color/white"/>
+                <corners android:radius="?android:attr/buttonCornerRadius"/>
+            </shape>
+        </item>
+        <item>
+            <shape android:shape="rectangle">
+                <corners android:radius="?android:attr/buttonCornerRadius"/>
+                <solid android:color="@android:color/transparent"/>
+                <stroke android:color="?androidprv:attr/colorAccentPrimary"
+                        android:width="1dp"
+                />
+                <padding android:left="@dimen/qs_dialog_button_horizontal_padding"
+                         android:top="@dimen/qs_dialog_button_vertical_padding"
+                         android:right="@dimen/qs_dialog_button_horizontal_padding"
+                         android:bottom="@dimen/qs_dialog_button_vertical_padding"/>
+            </shape>
+        </item>
+    </ripple>
+</inset>
diff --git a/packages/SystemUI/res/layout/qs_user_dialog_content.xml b/packages/SystemUI/res/layout/qs_user_dialog_content.xml
new file mode 100644
index 0000000000000..377da45d0ffdf
--- /dev/null
+++ b/packages/SystemUI/res/layout/qs_user_dialog_content.xml
@@ -0,0 +1,89 @@
+<?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.
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:sysui="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:padding="24dp"
+    android:layout_marginStart="16dp"
+    android:layout_marginEnd="16dp"
+    android:background="@drawable/qs_dialog_bg"
+>
+    <TextView
+        android:id="@+id/title"
+        android:layout_height="wrap_content"
+        android:layout_width="0dp"
+        android:textAlignment="center"
+        android:text="Select user"
+        android:textAppearance="@style/TextAppearance.QSDialog.Title"
+        android:layout_marginBottom="32dp"
+        sysui:layout_constraintTop_toTopOf="parent"
+        sysui:layout_constraintStart_toStartOf="parent"
+        sysui:layout_constraintEnd_toEndOf="parent"
+        sysui:layout_constraintBottom_toTopOf="@id/grid"
+        />
+
+    <com.android.systemui.qs.PseudoGridView
+        android:id="@+id/grid"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="28dp"
+        sysui:verticalSpacing="4dp"
+        sysui:horizontalSpacing="4dp"
+        sysui:fixedChildWidth="80dp"
+        sysui:layout_constraintTop_toBottomOf="@id/title"
+        sysui:layout_constraintStart_toStartOf="parent"
+        sysui:layout_constraintEnd_toEndOf="parent"
+        sysui:layout_constraintBottom_toTopOf="@id/barrier"
+    />
+
+    <androidx.constraintlayout.widget.Barrier
+        android:id="@+id/barrier"
+        android:layout_height="wrap_content"
+        android:layout_width="wrap_content"
+        sysui:barrierDirection="top"
+        sysui:constraint_referenced_ids="settings,done"
+        />
+
+    <Button
+        android:id="@+id/settings"
+        android:layout_width="wrap_content"
+        android:layout_height="48dp"
+        android:text="@string/quick_settings_more_user_settings"
+        sysui:layout_constraintTop_toBottomOf="@id/barrier"
+        sysui:layout_constraintBottom_toBottomOf="parent"
+        sysui:layout_constraintStart_toStartOf="parent"
+        sysui:layout_constraintEnd_toStartOf="@id/done"
+        sysui:layout_constraintHorizontal_chainStyle="spread_inside"
+        style="@style/Widget.QSDialog.Button.BorderButton"
+        />
+
+    <Button
+        android:id="@+id/done"
+        android:layout_width="wrap_content"
+        android:layout_height="48dp"
+        android:text="@string/quick_settings_done"
+        sysui:layout_constraintTop_toBottomOf="@id/barrier"
+        sysui:layout_constraintBottom_toBottomOf="parent"
+        sysui:layout_constraintStart_toEndOf="@id/settings"
+        sysui:layout_constraintEnd_toEndOf="parent"
+        style="@style/Widget.QSDialog.Button"
+        />
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/packages/SystemUI/res/values/attrs.xml b/packages/SystemUI/res/values/attrs.xml
index 3121ce37490a1..db699242a0618 100644
--- a/packages/SystemUI/res/values/attrs.xml
+++ b/packages/SystemUI/res/values/attrs.xml
@@ -77,6 +77,7 @@
         <attr name="numColumns" format="integer" />
         <attr name="verticalSpacing" format="dimension" />
         <attr name="horizontalSpacing" format="dimension" />
+        <attr name="fixedChildWidth" format="dimension" />
     </declare-styleable>
 
     <!-- Theme for icons in the status/nav bar (light/dark). background/fillColor is used for dual
diff --git a/packages/SystemUI/res/values/dimens.xml b/packages/SystemUI/res/values/dimens.xml
index 4d19c07529ca4..63c16840dd8ac 100644
--- a/packages/SystemUI/res/values/dimens.xml
+++ b/packages/SystemUI/res/values/dimens.xml
@@ -1640,4 +1640,9 @@
     <dimen name="qs_tile_service_request_dialog_width">304dp</dimen>
     <dimen name="qs_tile_service_request_tile_width">192dp</dimen>
     <dimen name="qs_tile_service_request_content_space">24dp</dimen>
+
+    <dimen name="qs_dialog_button_horizontal_padding">16dp</dimen>
+    <dimen name="qs_dialog_button_vertical_padding">8dp</dimen>
+    <!-- The button will be 48dp tall, but the background needs to be 36dp tall -->
+    <dimen name="qs_dialog_button_vertical_inset">6dp</dimen>
 </resources>
diff --git a/packages/SystemUI/res/values/flags.xml b/packages/SystemUI/res/values/flags.xml
index a9cc6ac47f69e..5ef91633cf7e3 100644
--- a/packages/SystemUI/res/values/flags.xml
+++ b/packages/SystemUI/res/values/flags.xml
@@ -56,4 +56,6 @@
     <bool name="flag_smartspace_deduping">true</bool>
 
     <bool name="flag_combined_status_bar_signal_icons">false</bool>
+
+    <bool name="flag_new_user_switcher">false</bool>
 </resources>
diff --git a/packages/SystemUI/res/values/styles.xml b/packages/SystemUI/res/values/styles.xml
index 7f4866f5a586b..dc17afb27f2dd 100644
--- a/packages/SystemUI/res/values/styles.xml
+++ b/packages/SystemUI/res/values/styles.xml
@@ -944,6 +944,39 @@
         <item name="actionDividerHeight">32dp</item>
     </style>
 
+    <style name="Theme.SystemUI.Dialog.QSDialog">
+        <item name="android:windowIsTranslucent">true</item>
+        <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:windowIsFloating">true</item>
+        <item name="android:backgroundDimEnabled">true</item>
+        <item name="android:windowCloseOnTouchOutside">true</item>
+        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
+        <item name="android:dialogCornerRadius">28dp</item>
+        <item name="android:buttonCornerRadius">28dp</item>
+        <item name="android:colorBackground">@color/prv_color_surface</item>
+    </style>
+
+    <style name="TextAppearance.QSDialog.Title" parent="Theme.SystemUI.Dialog.QSDialog">
+        <item name="android:textColor">?android:attr/textColorPrimary</item>
+        <item name="android:textSize">24sp</item>
+        <item name="android:fontFamily">@*android:string/config_headlineFontFamily</item>
+        <item name="android:lineHeight">32sp</item>
+    </style>
+
+    <style name="Widget.QSDialog.Button" parent = "Theme.SystemUI.Dialog.QSDialog">
+        <item name="android:background">@drawable/qs_dialog_btn_filled</item>
+        <item name="android:textColor">@color/prv_text_color_on_accent</item>
+        <item name="android:textSize">14sp</item>
+        <item name="android:lineHeight">20sp</item>
+        <item name="android:fontFamily">@*android:string/config_bodyFontFamily</item>
+        <item name="android:stateListAnimator">@null</item>
+    </style>
+
+    <style name="Widget.QSDialog.Button.BorderButton">
+        <item name="android:background">@drawable/qs_dialog_btn_outline</item>
+        <item name="android:textColor">?android:attr/textColorPrimary</item>
+    </style>
+
     <style name="Theme.SystemUI.Dialog.Internet">
         <item name="android:windowBackground">@drawable/internet_dialog_background</item>
     </style>
diff --git a/packages/SystemUI/src/com/android/systemui/flags/FeatureFlags.java b/packages/SystemUI/src/com/android/systemui/flags/FeatureFlags.java
index 1a6d6ae1c286d..3ff088358ab08 100644
--- a/packages/SystemUI/src/com/android/systemui/flags/FeatureFlags.java
+++ b/packages/SystemUI/src/com/android/systemui/flags/FeatureFlags.java
@@ -191,6 +191,13 @@ public class FeatureFlags {
         return FeatureFlagUtils.isEnabled(mContext, FeatureFlagUtils.SETTINGS_PROVIDER_MODEL);
     }
 
+    /**
+     * Use the new version of the user switcher
+     */
+    public boolean useNewUserSwitcher() {
+        return mFlagReader.isEnabled(R.bool.flag_new_user_switcher);
+    }
+
     /** static method for the system setting */
     public static boolean isProviderModelSettingEnabled(Context context) {
         return FeatureFlagUtils.isEnabled(context, FeatureFlagUtils.SETTINGS_PROVIDER_MODEL);
diff --git a/packages/SystemUI/src/com/android/systemui/qs/PseudoGridView.java b/packages/SystemUI/src/com/android/systemui/qs/PseudoGridView.java
index 87c64c78edc84..2f189beb7780b 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/PseudoGridView.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/PseudoGridView.java
@@ -38,6 +38,7 @@ public class PseudoGridView extends ViewGroup {
     private int mNumColumns = 3;
     private int mVerticalSpacing;
     private int mHorizontalSpacing;
+    private int mFixedChildWidth = -1;
 
     public PseudoGridView(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -53,6 +54,8 @@ public class PseudoGridView extends ViewGroup {
                 mVerticalSpacing = a.getDimensionPixelSize(attr, 0);
             } else if (attr == R.styleable.PseudoGridView_horizontalSpacing) {
                 mHorizontalSpacing = a.getDimensionPixelSize(attr, 0);
+            } else if (attr == R.styleable.PseudoGridView_fixedChildWidth) {
+                mFixedChildWidth = a.getDimensionPixelSize(attr, -1);
             }
         }
 
@@ -65,8 +68,15 @@ public class PseudoGridView extends ViewGroup {
             throw new UnsupportedOperationException("Needs a maximum width");
         }
         int width = MeasureSpec.getSize(widthMeasureSpec);
-
-        int childWidth = (width - (mNumColumns - 1) * mHorizontalSpacing) / mNumColumns;
+        int childWidth;
+        int necessarySpaceForChildWidth =
+                mFixedChildWidth * mNumColumns + mHorizontalSpacing * (mNumColumns - 1);
+        if (mFixedChildWidth != -1 && necessarySpaceForChildWidth <= width) {
+            childWidth = mFixedChildWidth;
+            width = mFixedChildWidth * mNumColumns + mHorizontalSpacing * (mNumColumns - 1);
+        } else {
+            childWidth = (width - (mNumColumns - 1) * mHorizontalSpacing) / mNumColumns;
+        }
         int childWidthSpec = MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY);
         int childHeightSpec = MeasureSpec.UNSPECIFIED;
         int totalHeight = 0;
diff --git a/packages/SystemUI/src/com/android/systemui/qs/tiles/UserDetailView.java b/packages/SystemUI/src/com/android/systemui/qs/tiles/UserDetailView.java
index ccc08e0517fb4..b718ebf035029 100644
--- a/packages/SystemUI/src/com/android/systemui/qs/tiles/UserDetailView.java
+++ b/packages/SystemUI/src/com/android/systemui/qs/tiles/UserDetailView.java
@@ -40,6 +40,8 @@ import com.android.systemui.qs.PseudoGridView;
 import com.android.systemui.qs.QSUserSwitcherEvent;
 import com.android.systemui.statusbar.policy.UserSwitcherController;
 
+import java.util.function.Consumer;
+
 import javax.inject.Inject;
 
 /**
@@ -76,6 +78,7 @@ public class UserDetailView extends PseudoGridView {
         private View mCurrentUserView;
         private final UiEventLogger mUiEventLogger;
         private final FalsingManager mFalsingManager;
+        private Consumer<UserSwitcherController.UserRecord> mClickCallback;
 
         @Inject
         public Adapter(Context context, UserSwitcherController controller,
@@ -93,6 +96,10 @@ public class UserDetailView extends PseudoGridView {
             return createUserDetailItemView(convertView, parent, item);
         }
 
+        public void injectCallback(Consumer<UserSwitcherController.UserRecord> clickCallback) {
+            mClickCallback = clickCallback;
+        }
+
         public UserDetailItemView createUserDetailItemView(View convertView, ViewGroup parent,
                 UserSwitcherController.UserRecord item) {
             UserDetailItemView v = UserDetailItemView.convertOrInflate(
@@ -170,6 +177,13 @@ public class UserDetailView extends PseudoGridView {
                 onUserListItemClicked(tag);
             }
             Trace.endSection();
+            if (mClickCallback != null) {
+                mClickCallback.accept(tag);
+            }
+        }
+
+        public void linkToViewGroup(ViewGroup viewGroup) {
+            PseudoGridView.ViewGroupAdapterBridge.link(viewGroup, this);
         }
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/qs/user/UserDialog.kt b/packages/SystemUI/src/com/android/systemui/qs/user/UserDialog.kt
new file mode 100644
index 0000000000000..2ad06c1c172c2
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/qs/user/UserDialog.kt
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.qs.user
+
+import android.content.Context
+import android.os.Bundle
+import android.view.Gravity
+import android.view.View
+import android.view.ViewGroup
+import android.view.WindowInsets
+import android.view.WindowManager
+import com.android.systemui.qs.PseudoGridView
+import com.android.systemui.statusbar.phone.SystemUIDialog
+import com.android.systemui.R
+
+/**
+ * Dialog for switching users or creating new ones.
+ */
+class UserDialog(
+    context: Context
+) : SystemUIDialog(context, R.style.Theme_SystemUI_Dialog_QSDialog) {
+
+    // create() is no-op after creation
+    private lateinit var _doneButton: View
+    /**
+     * Button with text "Done" in dialog.
+     */
+    val doneButton: View
+        get() {
+            create()
+            return _doneButton
+        }
+
+    private lateinit var _settingsButton: View
+    /**
+     * Button with text "User Settings" in dialog.
+     */
+    val settingsButton: View
+        get() {
+            create()
+            return _settingsButton
+        }
+
+    private lateinit var _grid: PseudoGridView
+    /**
+     * Grid to populate with user avatar from adapter
+     */
+    val grid: ViewGroup
+        get() {
+            create()
+            return _grid
+        }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        window?.apply {
+            setType(WindowManager.LayoutParams.TYPE_STATUS_BAR_SUB_PANEL)
+            attributes.fitInsetsTypes = attributes.fitInsetsTypes or WindowInsets.Type.statusBars()
+            attributes.receiveInsetsIgnoringZOrder = true
+            setLayout(
+                    context.resources.getDimensionPixelSize(R.dimen.qs_panel_width),
+                    ViewGroup.LayoutParams.WRAP_CONTENT
+            )
+            setGravity(Gravity.CENTER)
+        }
+        setContentView(R.layout.qs_user_dialog_content)
+
+        _doneButton = requireViewById(R.id.done)
+        _settingsButton = requireViewById(R.id.settings)
+        _grid = requireViewById(R.id.grid)
+    }
+}
\ No newline at end of file
diff --git a/packages/SystemUI/src/com/android/systemui/qs/user/UserSwitchDialogController.kt b/packages/SystemUI/src/com/android/systemui/qs/user/UserSwitchDialogController.kt
new file mode 100644
index 0000000000000..a5e4ba1b5b4bf
--- /dev/null
+++ b/packages/SystemUI/src/com/android/systemui/qs/user/UserSwitchDialogController.kt
@@ -0,0 +1,87 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.qs.user
+
+import android.content.Context
+import android.content.Intent
+import android.provider.Settings
+import android.view.View
+import androidx.annotation.VisibleForTesting
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.plugins.ActivityStarter
+import com.android.systemui.plugins.FalsingManager
+import com.android.systemui.qs.tiles.UserDetailView
+import javax.inject.Inject
+import javax.inject.Provider
+
+/**
+ * Controller for [UserDialog].
+ */
+@SysUISingleton
+class UserSwitchDialogController @VisibleForTesting constructor(
+    private val userDetailViewAdapterProvider: Provider<UserDetailView.Adapter>,
+    private val activityStarter: ActivityStarter,
+    private val falsingManager: FalsingManager,
+    private val dialogFactory: (Context) -> UserDialog
+) {
+
+    @Inject
+    constructor(
+        userDetailViewAdapterProvider: Provider<UserDetailView.Adapter>,
+        activityStarter: ActivityStarter,
+        falsingManager: FalsingManager
+    ) : this(
+        userDetailViewAdapterProvider,
+        activityStarter,
+        falsingManager,
+        { UserDialog(it) }
+    )
+
+    companion object {
+        private val USER_SETTINGS_INTENT = Intent(Settings.ACTION_USER_SETTINGS)
+    }
+
+    /**
+     * Show a [UserDialog].
+     *
+     * Populate the dialog with information from and adapter obtained from
+     * [userDetailViewAdapterProvider] and show it as launched from [view].
+     */
+    fun showDialog(view: View) {
+        with(dialogFactory(view.context)) {
+            setShowForAllUsers(true)
+            setCanceledOnTouchOutside(true)
+            create() // Needs to be called before we can retrieve views
+
+            settingsButton.setOnClickListener {
+                if (!falsingManager.isFalseTap(FalsingManager.LOW_PENALTY)) {
+                    activityStarter.postStartActivityDismissingKeyguard(USER_SETTINGS_INTENT, 0)
+                }
+                dismiss()
+            }
+            doneButton.setOnClickListener { dismiss() }
+
+            val adapter = userDetailViewAdapterProvider.get()
+            adapter.injectCallback {
+                dismiss()
+            }
+            adapter.linkToViewGroup(grid)
+
+            show()
+        }
+    }
+}
\ No newline at end of file
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/MultiUserSwitchController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/MultiUserSwitchController.java
index f27c7d28df447..2cacf92123d2b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/MultiUserSwitchController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/MultiUserSwitchController.java
@@ -23,10 +23,12 @@ import android.view.View;
 import android.view.ViewGroup;
 
 import com.android.systemui.R;
+import com.android.systemui.flags.FeatureFlags;
 import com.android.systemui.plugins.FalsingManager;
 import com.android.systemui.plugins.qs.DetailAdapter;
 import com.android.systemui.qs.QSDetailDisplayer;
 import com.android.systemui.qs.dagger.QSScope;
+import com.android.systemui.qs.user.UserSwitchDialogController;
 import com.android.systemui.statusbar.policy.UserSwitcherController;
 import com.android.systemui.util.ViewController;
 
@@ -39,6 +41,8 @@ public class MultiUserSwitchController extends ViewController<MultiUserSwitch> {
     private final UserSwitcherController mUserSwitcherController;
     private final QSDetailDisplayer mQsDetailDisplayer;
     private final FalsingManager mFalsingManager;
+    private final UserSwitchDialogController mUserSwitchDialogController;
+    private final FeatureFlags mFeatureFlags;
 
     private UserSwitcherController.BaseUserAdapter mUserListener;
 
@@ -49,26 +53,33 @@ public class MultiUserSwitchController extends ViewController<MultiUserSwitch> {
                 return;
             }
 
-            View center = mView.getChildCount() > 0 ? mView.getChildAt(0) : mView;
+            if (mFeatureFlags.useNewUserSwitcher()) {
+                mUserSwitchDialogController.showDialog(v);
+            } else {
+                View center = mView.getChildCount() > 0 ? mView.getChildAt(0) : mView;
 
-            int[] tmpInt = new int[2];
-            center.getLocationInWindow(tmpInt);
-            tmpInt[0] += center.getWidth() / 2;
-            tmpInt[1] += center.getHeight() / 2;
+                int[] tmpInt = new int[2];
+                center.getLocationInWindow(tmpInt);
+                tmpInt[0] += center.getWidth() / 2;
+                tmpInt[1] += center.getHeight() / 2;
 
-            mQsDetailDisplayer.showDetailAdapter(getUserDetailAdapter(), tmpInt[0], tmpInt[1]);
+                mQsDetailDisplayer.showDetailAdapter(getUserDetailAdapter(), tmpInt[0], tmpInt[1]);
+            }
         }
     };
 
     @Inject
     public MultiUserSwitchController(MultiUserSwitch view, UserManager userManager,
             UserSwitcherController userSwitcherController, QSDetailDisplayer qsDetailDisplayer,
-            FalsingManager falsingManager) {
+            FalsingManager falsingManager, UserSwitchDialogController userSwitchDialogController,
+            FeatureFlags featureFlags) {
         super(view);
         mUserManager = userManager;
         mUserSwitcherController = userSwitcherController;
         mQsDetailDisplayer = qsDetailDisplayer;
         mFalsingManager = falsingManager;
+        mUserSwitchDialogController = userSwitchDialogController;
+        mFeatureFlags = featureFlags;
     }
 
     @Override
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardQsUserSwitchController.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardQsUserSwitchController.java
index a29b72c759dbb..b6c683f389e5c 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardQsUserSwitchController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardQsUserSwitchController.java
@@ -35,10 +35,12 @@ import com.android.settingslib.drawable.CircleFramedDrawable;
 import com.android.systemui.R;
 import com.android.systemui.communal.CommunalStateController;
 import com.android.systemui.dagger.qualifiers.Main;
+import com.android.systemui.flags.FeatureFlags;
 import com.android.systemui.keyguard.ScreenLifecycle;
 import com.android.systemui.plugins.FalsingManager;
 import com.android.systemui.plugins.statusbar.StatusBarStateController;
 import com.android.systemui.qs.tiles.UserDetailView;
+import com.android.systemui.qs.user.UserSwitchDialogController;
 import com.android.systemui.statusbar.SysuiStatusBarStateController;
 import com.android.systemui.statusbar.notification.AnimatableProperty;
 import com.android.systemui.statusbar.notification.PropertyAnimator;
@@ -76,6 +78,8 @@ public class KeyguardQsUserSwitchController extends ViewController<UserAvatarVie
     private final ConfigurationController mConfigurationController;
     private final KeyguardVisibilityHelper mKeyguardVisibilityHelper;
     private final KeyguardUserDetailAdapter mUserDetailAdapter;
+    private final FeatureFlags mFeatureFlags;
+    private final UserSwitchDialogController mUserSwitchDialogController;
     private NotificationPanelViewController mNotificationPanelViewController;
     UserSwitcherController.UserRecord mCurrentUser;
 
@@ -124,7 +128,9 @@ public class KeyguardQsUserSwitchController extends ViewController<UserAvatarVie
             SysuiStatusBarStateController statusBarStateController,
             DozeParameters dozeParameters,
             Provider<UserDetailView.Adapter> userDetailViewAdapterProvider,
-            UnlockedScreenOffAnimationController unlockedScreenOffAnimationController) {
+            UnlockedScreenOffAnimationController unlockedScreenOffAnimationController,
+            FeatureFlags featureFlags,
+            UserSwitchDialogController userSwitchDialogController) {
         super(view);
         if (DEBUG) Log.d(TAG, "New KeyguardQsUserSwitchController");
         mContext = context;
@@ -140,6 +146,8 @@ public class KeyguardQsUserSwitchController extends ViewController<UserAvatarVie
                 unlockedScreenOffAnimationController,  /* animateYPos= */ false,
                 /* visibleOnCommunal= */ false);
         mUserDetailAdapter = new KeyguardUserDetailAdapter(context, userDetailViewAdapterProvider);
+        mFeatureFlags = featureFlags;
+        mUserSwitchDialogController = userSwitchDialogController;
     }
 
     @Override
@@ -163,7 +171,11 @@ public class KeyguardQsUserSwitchController extends ViewController<UserAvatarVie
             }
 
             // Tapping anywhere in the view will open QS user panel
-            openQsUserPanel();
+            if (mFeatureFlags.useNewUserSwitcher()) {
+                mUserSwitchDialogController.showDialog(mView);
+            } else {
+                openQsUserPanel();
+            }
         });
 
         mView.setAccessibilityDelegate(new View.AccessibilityDelegate() {
diff --git a/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserDialogTest.kt b/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserDialogTest.kt
new file mode 100644
index 0000000000000..d5fe588b21150
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserDialogTest.kt
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.qs.user
+
+import android.testing.AndroidTestingRunner
+import android.testing.TestableLooper
+import android.view.View
+import android.view.ViewGroup
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.google.common.truth.Truth.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+@TestableLooper.RunWithLooper
+class UserDialogTest : SysuiTestCase() {
+
+    private lateinit var dialog: UserDialog
+
+    @Before
+    fun setUp() {
+        dialog = UserDialog(mContext)
+    }
+
+    @After
+    fun tearDown() {
+        dialog.dismiss()
+    }
+
+    @Test
+    fun doneButtonExists() {
+        assertThat(dialog.doneButton).isInstanceOf(View::class.java)
+    }
+
+    @Test
+    fun settingsButtonExists() {
+        assertThat(dialog.settingsButton).isInstanceOf(View::class.java)
+    }
+
+    @Test
+    fun gridExistsAndIsViewGroup() {
+        assertThat(dialog.grid).isInstanceOf(ViewGroup::class.java)
+    }
+}
\ No newline at end of file
diff --git a/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserSwitchDialogControllerTest.kt b/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserSwitchDialogControllerTest.kt
new file mode 100644
index 0000000000000..a1760a79417f4
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/qs/user/UserSwitchDialogControllerTest.kt
@@ -0,0 +1,203 @@
+/*
+ * 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.
+ */
+
+package com.android.systemui.qs.user
+
+import android.content.Intent
+import android.provider.Settings
+import android.testing.AndroidTestingRunner
+import android.view.View
+import androidx.test.filters.SmallTest
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.plugins.ActivityStarter
+import com.android.systemui.plugins.FalsingManager
+import com.android.systemui.qs.PseudoGridView
+import com.android.systemui.qs.tiles.UserDetailView
+import com.android.systemui.statusbar.policy.UserSwitcherController
+import com.android.systemui.util.mockito.argumentCaptor
+import com.android.systemui.util.mockito.capture
+import com.android.systemui.util.mockito.eq
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.ArgumentCaptor
+import org.mockito.ArgumentMatcher
+import org.mockito.Captor
+import org.mockito.Mock
+import org.mockito.Mockito.`when`
+import org.mockito.Mockito.any
+import org.mockito.Mockito.anyInt
+import org.mockito.Mockito.argThat
+import org.mockito.Mockito.inOrder
+import org.mockito.Mockito.mock
+import org.mockito.Mockito.never
+import org.mockito.Mockito.verify
+import org.mockito.MockitoAnnotations
+import java.util.function.Consumer
+
+@SmallTest
+@RunWith(AndroidTestingRunner::class)
+class UserSwitchDialogControllerTest : SysuiTestCase() {
+
+    @Mock
+    private lateinit var dialog: UserDialog
+    @Mock
+    private lateinit var falsingManager: FalsingManager
+    @Mock
+    private lateinit var settingsView: View
+    @Mock
+    private lateinit var doneView: View
+    @Mock
+    private lateinit var activityStarter: ActivityStarter
+    @Mock
+    private lateinit var userDetailViewAdapter: UserDetailView.Adapter
+    @Mock
+    private lateinit var launchView: View
+    @Mock
+    private lateinit var gridView: PseudoGridView
+    @Captor
+    private lateinit var clickCaptor: ArgumentCaptor<View.OnClickListener>
+
+    private lateinit var controller: UserSwitchDialogController
+
+    @Before
+    fun setUp() {
+        MockitoAnnotations.initMocks(this)
+
+        `when`(dialog.settingsButton).thenReturn(settingsView)
+        `when`(dialog.doneButton).thenReturn(doneView)
+        `when`(dialog.grid).thenReturn(gridView)
+
+        `when`(launchView.context).thenReturn(mContext)
+
+        controller = UserSwitchDialogController(
+                { userDetailViewAdapter },
+                activityStarter,
+                falsingManager,
+                { dialog }
+        )
+    }
+
+    @Test
+    fun showDialog_callsDialogShow() {
+        controller.showDialog(launchView)
+        verify(dialog).show()
+    }
+
+    @Test
+    fun createCalledBeforeDoneButton() {
+        controller.showDialog(launchView)
+        val inOrder = inOrder(dialog)
+        inOrder.verify(dialog).create()
+        inOrder.verify(dialog).doneButton
+    }
+
+    @Test
+    fun createCalledBeforeSettingsButton() {
+        controller.showDialog(launchView)
+        val inOrder = inOrder(dialog)
+        inOrder.verify(dialog).create()
+        inOrder.verify(dialog).settingsButton
+    }
+
+    @Test
+    fun createCalledBeforeGrid() {
+        controller.showDialog(launchView)
+        val inOrder = inOrder(dialog)
+        inOrder.verify(dialog).create()
+        inOrder.verify(dialog).grid
+    }
+
+    @Test
+    fun dialog_showForAllUsers() {
+        controller.showDialog(launchView)
+        verify(dialog).setShowForAllUsers(true)
+    }
+
+    @Test
+    fun dialog_cancelOnTouchOutside() {
+        controller.showDialog(launchView)
+        verify(dialog).setCanceledOnTouchOutside(true)
+    }
+
+    @Test
+    fun adapterAndGridLinked() {
+        controller.showDialog(launchView)
+        verify(userDetailViewAdapter).linkToViewGroup(gridView)
+    }
+
+    @Test
+    fun clickDoneButton_dismiss() {
+        controller.showDialog(launchView)
+
+        verify(doneView).setOnClickListener(capture(clickCaptor))
+
+        clickCaptor.value.onClick(doneView)
+
+        verify(activityStarter, never()).postStartActivityDismissingKeyguard(any(), anyInt())
+        verify(dialog).dismiss()
+    }
+
+    @Test
+    fun clickSettingsButton_noFalsing_opensSettingsAndDismisses() {
+        `when`(falsingManager.isFalseTap(anyInt())).thenReturn(false)
+
+        controller.showDialog(launchView)
+
+        verify(settingsView).setOnClickListener(capture(clickCaptor))
+
+        clickCaptor.value.onClick(settingsView)
+
+        verify(activityStarter)
+                .postStartActivityDismissingKeyguard(
+                        argThat(IntentMatcher(Settings.ACTION_USER_SETTINGS)),
+                        eq(0)
+                )
+        verify(dialog).dismiss()
+    }
+
+    @Test
+    fun clickSettingsButton_Falsing_notOpensSettingsAndDismisses() {
+        `when`(falsingManager.isFalseTap(anyInt())).thenReturn(true)
+
+        controller.showDialog(launchView)
+
+        verify(settingsView).setOnClickListener(capture(clickCaptor))
+
+        clickCaptor.value.onClick(settingsView)
+
+        verify(activityStarter, never()).postStartActivityDismissingKeyguard(any(), anyInt())
+        verify(dialog).dismiss()
+    }
+
+    @Test
+    fun callbackFromDetailView_dismissesDialog() {
+        val captor = argumentCaptor<Consumer<UserSwitcherController.UserRecord>>()
+
+        controller.showDialog(launchView)
+        verify(userDetailViewAdapter).injectCallback(capture(captor))
+
+        captor.value.accept(mock(UserSwitcherController.UserRecord::class.java))
+
+        verify(dialog).dismiss()
+    }
+
+    private class IntentMatcher(private val action: String) : ArgumentMatcher<Intent> {
+        override fun matches(argument: Intent?): Boolean {
+            return argument?.action == action
+        }
+    }
+}
\ No newline at end of file