[Central Surfaces] Make NotificationShadeWindowView a singleton.

Bug: 277762009
Test: compiles; notification shade still works
Change-Id: I58546516fe6daa3efb9ab0879fd962caf08d8b00

packages/SystemUI/src/com/android/systemui/dagger/SystemUIModule.java

@@ -71,6 +71,7 @@ import com.android.systemui.screenshot.dagger.ScreenshotModule;
 import com.android.systemui.security.data.repository.SecurityRepositoryModule;
 import com.android.systemui.settings.DisplayTracker;
 import com.android.systemui.shade.ShadeController;
+import com.android.systemui.shade.ShadeModule;
 import com.android.systemui.shade.transition.LargeScreenShadeInterpolator;
 import com.android.systemui.shade.transition.LargeScreenShadeInterpolatorImpl;
 import com.android.systemui.smartspace.dagger.SmartspaceModule;
@@ -174,6 +175,7 @@ import javax.inject.Named;
             SecurityRepositoryModule.class,
             ScreenRecordModule.class,
             SettingsUtilModule.class,
+            ShadeModule.class,
             SmartRepliesInflationModule.class,
             SmartspaceModule.class,
             StatusBarPipelineModule.class,

packages/SystemUI/src/com/android/systemui/shade/ShadeModule.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2023 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.shade
+
+import android.view.LayoutInflater
+import com.android.systemui.R
+import com.android.systemui.dagger.SysUISingleton
+import dagger.Module
+import dagger.Provides
+
+/** Module for classes related to the notification shade. */
+@Module
+abstract class ShadeModule {
+    companion object {
+        @Provides
+        @SysUISingleton
+        // TODO(b/277762009): Do something similar to
+        //  {@link StatusBarWindowModule.InternalWindowView} so that only
+        //  {@link NotificationShadeWindowViewController} can inject this view.
+        fun providesNotificationShadeWindowView(
+            layoutInflater: LayoutInflater,
+        ): NotificationShadeWindowView {
+            return layoutInflater.inflate(R.layout.super_notification_shade, /* root= */ null)
+                as NotificationShadeWindowView?
+                ?: throw IllegalStateException(
+                    "R.layout.super_notification_shade could not be properly inflated"
+                )
+        }
+    }
+}

packages/SystemUI/src/com/android/systemui/statusbar/phone/CentralSurfacesImpl.java

@@ -1637,6 +1637,8 @@ public class CentralSurfacesImpl implements CoreStartable, CentralSurfaces {
         mNotificationShadeWindowView = mCentralSurfacesComponent.getNotificationShadeWindowView();
         mNotificationShadeWindowViewController = mCentralSurfacesComponent
                 .getNotificationShadeWindowViewController();
+        // TODO(b/277762009): Inject [NotificationShadeWindowView] directly into the controller.
+        //  (Right now, there's a circular dependency.)
         mNotificationShadeWindowController.setNotificationShadeView(mNotificationShadeWindowView);
         mNotificationShadeWindowViewController.setupExpandedStatusBar();
         NotificationPanelViewController npvc =

packages/SystemUI/src/com/android/systemui/statusbar/phone/dagger/StatusBarViewModule.java

@@ -95,21 +95,6 @@ public abstract class StatusBarViewModule {
     public static final String SHADE_HEADER = "large_screen_shade_header";
     public static final String STATUS_BAR_FRAGMENT = "status_bar_fragment";
 
-    /** */
-    @Provides
-    @CentralSurfacesComponent.CentralSurfacesScope
-    public static NotificationShadeWindowView providesNotificationShadeWindowView(
-            LayoutInflater layoutInflater) {
-        NotificationShadeWindowView notificationShadeWindowView = (NotificationShadeWindowView)
-                layoutInflater.inflate(R.layout.super_notification_shade, /* root= */ null);
-        if (notificationShadeWindowView == null) {
-            throw new IllegalStateException(
-                    "R.layout.super_notification_shade could not be properly inflated");
-        }
-
-        return notificationShadeWindowView;
-    }
-
     /** */
     @Provides
     @CentralSurfacesComponent.CentralSurfacesScope