Expose DockedStackListener for logging purposes in Launcher

Bug: 111077107
Test: Implement listener in Launcher and verify the callbacks are made

Change-Id: I4017c8e139242c2b0875f8222c99396d55b1be04
Signed-off-by: Winson Chung <winsonc@google.com>

packages/SystemUI/shared/src/com/android/systemui/shared/system/DockedStackListenerCompat.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2018 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.shared.system;
+
+import android.view.IDockedStackListener;
+
+/**
+ * An interface to track docked stack changes.
+ */
+public class DockedStackListenerCompat {
+
+    IDockedStackListener.Stub mListener = new IDockedStackListener.Stub() {
+        @Override
+        public void onDividerVisibilityChanged(boolean visible) {}
+
+        @Override
+        public void onDockedStackExistsChanged(boolean exists) {
+            DockedStackListenerCompat.this.onDockedStackExistsChanged(exists);
+        }
+
+        @Override
+        public void onDockedStackMinimizedChanged(boolean minimized, long animDuration,
+                boolean isHomeStackResizable) {
+            DockedStackListenerCompat.this.onDockedStackMinimizedChanged(minimized, animDuration,
+                    isHomeStackResizable);
+        }
+
+        @Override
+        public void onAdjustedForImeChanged(boolean adjustedForIme, long animDuration) {}
+
+        @Override
+        public void onDockSideChanged(final int newDockSide) {
+            DockedStackListenerCompat.this.onDockSideChanged(newDockSide);
+        }
+    };
+
+    public void onDockedStackExistsChanged(boolean exists) {
+        // To be overridden
+    }
+
+    public void onDockedStackMinimizedChanged(boolean minimized, long animDuration,
+            boolean isHomeStackResizable) {
+        // To be overridden
+    }
+
+    public void onDockSideChanged(final int newDockSide) {
+        // To be overridden
+    }
+}

packages/SystemUI/shared/src/com/android/systemui/shared/system/WindowManagerWrapper.java

@@ -166,4 +166,16 @@ public class WindowManagerWrapper {
         }
         return NAV_BAR_POS_INVALID;
     }
+
+    /**
+     * Registers a docked stack listener with the system.
+     */
+    public void registerDockedStackListener(DockedStackListenerCompat listener) {
+        try {
+            WindowManagerGlobal.getWindowManagerService().registerDockedStackListener(
+                    listener.mListener);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Failed to register docked stack listener");
+        }
+    }
 }

packages/SystemUI/tests/AndroidManifest.xml

@@ -49,6 +49,7 @@
     <uses-permission android:name="android.permission.INTERNAL_SYSTEM_WINDOW" />
     <uses-permission android:name="android.permission.NETWORK_SETTINGS" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.REGISTER_WINDOW_MANAGER_LISTENERS" />
 
     <application android:debuggable="true">
         <uses-library android:name="android.test.runner" />

services/core/java/com/android/server/wm/WindowManagerService.java

@@ -6916,10 +6916,8 @@ public class WindowManagerService extends IWindowManager.Stub
 
     @Override
     public void registerDockedStackListener(IDockedStackListener listener) {
-        if (!checkCallingPermission(REGISTER_WINDOW_MANAGER_LISTENERS,
-                "registerDockedStackListener()")) {
-            return;
-        }
+        mAtmInternal.enforceCallerIsRecentsOrHasPermission(REGISTER_WINDOW_MANAGER_LISTENERS,
+                "registerDockedStackListener()");
         synchronized (mWindowMap) {
             // TODO(multi-display): The listener is registered on the default display only.
             getDefaultDisplayContentLocked().mDividerControllerLocked.registerDockedStackListener(