Merge changes from topic "desktop-windowing-hide" into tm-qpr-dev

* changes:
  Hide some options when desktop mode is available
  Handle desktop mode setting change

libs/WindowManager/Shell/src/com/android/wm/shell/RootDisplayAreaOrganizer.java

@@ -16,14 +16,20 @@
 
 package com.android.wm.shell;
 
+import static com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_DESKTOP_MODE;
+
+import android.app.WindowConfiguration;
 import android.util.SparseArray;
 import android.view.SurfaceControl;
 import android.window.DisplayAreaAppearedInfo;
 import android.window.DisplayAreaInfo;
 import android.window.DisplayAreaOrganizer;
+import android.window.WindowContainerTransaction;
 
 import androidx.annotation.NonNull;
 
+import com.android.internal.protolog.common.ProtoLog;
+
 import java.io.PrintWriter;
 import java.util.List;
 import java.util.concurrent.Executor;
@@ -102,10 +108,44 @@ public class RootDisplayAreaOrganizer extends DisplayAreaOrganizer {
         mDisplayAreasInfo.put(displayId, displayAreaInfo);
     }
 
+    /**
+     * Create a {@link WindowContainerTransaction} to update display windowing mode.
+     *
+     * @param displayId display id to update windowing mode for
+     * @param windowingMode target {@link WindowConfiguration.WindowingMode}
+     * @return {@link WindowContainerTransaction} with pending operation to set windowing mode
+     */
+    public WindowContainerTransaction prepareWindowingModeChange(int displayId,
+            @WindowConfiguration.WindowingMode int windowingMode) {
+        WindowContainerTransaction wct = new WindowContainerTransaction();
+        DisplayAreaInfo displayAreaInfo = mDisplayAreasInfo.get(displayId);
+        if (displayAreaInfo == null) {
+            ProtoLog.e(WM_SHELL_DESKTOP_MODE,
+                    "unable to update windowing mode for display %d display not found", displayId);
+            return wct;
+        }
+
+        ProtoLog.d(WM_SHELL_DESKTOP_MODE,
+                "setWindowingMode: displayId=%d current wmMode=%d new wmMode=%d", displayId,
+                displayAreaInfo.configuration.windowConfiguration.getWindowingMode(),
+                windowingMode);
+
+        wct.setWindowingMode(displayAreaInfo.token, windowingMode);
+        return wct;
+    }
+
     public void dump(@NonNull PrintWriter pw, String prefix) {
         final String innerPrefix = prefix + "  ";
         final String childPrefix = innerPrefix + "  ";
         pw.println(prefix + this);
+
+        for (int i = 0; i < mDisplayAreasInfo.size(); i++) {
+            int displayId = mDisplayAreasInfo.keyAt(i);
+            DisplayAreaInfo displayAreaInfo = mDisplayAreasInfo.get(displayId);
+            int windowingMode =
+                    displayAreaInfo.configuration.windowConfiguration.getWindowingMode();
+            pw.println(innerPrefix + "# displayId=" + displayId + " wmMode=" + windowingMode);
+        }
     }
 
     @Override

libs/WindowManager/Shell/src/com/android/wm/shell/ShellTaskOrganizer.java

@@ -22,6 +22,7 @@ import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 
+import static com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_DESKTOP_MODE;
 import static com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_TASK_ORG;
 import static com.android.wm.shell.transition.Transitions.ENABLE_SHELL_TRANSITIONS;
 
@@ -46,6 +47,7 @@ import android.window.StartingWindowInfo;
 import android.window.StartingWindowRemovalInfo;
 import android.window.TaskAppearedInfo;
 import android.window.TaskOrganizer;
+import android.window.WindowContainerTransaction;
 
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.protolog.common.ProtoLog;
@@ -690,6 +692,49 @@ public class ShellTaskOrganizer extends TaskOrganizer implements
         taskListener.reparentChildSurfaceToTask(taskId, sc, t);
     }
 
+    /**
+     * Create a {@link WindowContainerTransaction} to clear task bounds.
+     *
+     * @param displayId display id for tasks that will have bounds cleared
+     * @return {@link WindowContainerTransaction} with pending operations to clear bounds
+     */
+    public WindowContainerTransaction prepareClearBoundsForTasks(int displayId) {
+        ProtoLog.d(WM_SHELL_DESKTOP_MODE, "prepareClearBoundsForTasks: displayId=%d", displayId);
+        WindowContainerTransaction wct = new WindowContainerTransaction();
+        for (int i = 0; i < mTasks.size(); i++) {
+            RunningTaskInfo taskInfo = mTasks.valueAt(i).getTaskInfo();
+            if (taskInfo.displayId == displayId) {
+                ProtoLog.d(WM_SHELL_DESKTOP_MODE, "clearing bounds for token=%s taskInfo=%s",
+                        taskInfo.token, taskInfo);
+                wct.setBounds(taskInfo.token, null);
+            }
+        }
+        return wct;
+    }
+
+    /**
+     * Create a {@link WindowContainerTransaction} to clear task level freeform setting.
+     *
+     * @param displayId display id for tasks that will have windowing mode reset to {@link
+     *                  WindowConfiguration#WINDOWING_MODE_UNDEFINED}
+     * @return {@link WindowContainerTransaction} with pending operations to clear windowing mode
+     */
+    public WindowContainerTransaction prepareClearFreeformForTasks(int displayId) {
+        ProtoLog.d(WM_SHELL_DESKTOP_MODE, "prepareClearFreeformForTasks: displayId=%d", displayId);
+        WindowContainerTransaction wct = new WindowContainerTransaction();
+        for (int i = 0; i < mTasks.size(); i++) {
+            RunningTaskInfo taskInfo = mTasks.valueAt(i).getTaskInfo();
+            if (taskInfo.displayId == displayId
+                    && taskInfo.getWindowingMode() == WINDOWING_MODE_FREEFORM) {
+                ProtoLog.d(WM_SHELL_DESKTOP_MODE,
+                        "clearing windowing mode for token=%s taskInfo=%s", taskInfo.token,
+                        taskInfo);
+                wct.setWindowingMode(taskInfo.token, WINDOWING_MODE_UNDEFINED);
+            }
+        }
+        return wct;
+    }
+
     private void logSizeCompatRestartButtonEventReported(@NonNull TaskAppearedInfo info,
             int event) {
         ActivityInfo topActivityInfo = info.getTaskInfo().topActivityInfo;
@@ -816,7 +861,14 @@ public class ShellTaskOrganizer extends TaskOrganizer implements
                 final int key = mTasks.keyAt(i);
                 final TaskAppearedInfo info = mTasks.valueAt(i);
                 final TaskListener listener = getTaskListener(info.getTaskInfo());
-                pw.println(innerPrefix + "#" + i + " task=" + key + " listener=" + listener);
+                final int windowingMode = info.getTaskInfo().getWindowingMode();
+                String pkg = "";
+                if (info.getTaskInfo().baseActivity != null) {
+                    pkg = info.getTaskInfo().baseActivity.getPackageName();
+                }
+                Rect bounds = info.getTaskInfo().getConfiguration().windowConfiguration.getBounds();
+                pw.println(innerPrefix + "#" + i + " task=" + key + " listener=" + listener
+                        + " wmMode=" + windowingMode + " pkg=" + pkg + " bounds=" + bounds);
             }
 
             pw.println();
@@ -826,6 +878,7 @@ public class ShellTaskOrganizer extends TaskOrganizer implements
                 final TaskListener listener = mLaunchCookieToListener.valueAt(i);
                 pw.println(innerPrefix + "#" + i + " cookie=" + key + " listener=" + listener);
             }
+
         }
     }
 }

libs/WindowManager/Shell/src/com/android/wm/shell/dagger/WMShellModule.java

@@ -27,6 +27,7 @@ import com.android.internal.jank.InteractionJankMonitor;
 import com.android.internal.logging.UiEventLogger;
 import com.android.internal.statusbar.IStatusBarService;
 import com.android.launcher3.icons.IconProvider;
+import com.android.wm.shell.RootDisplayAreaOrganizer;
 import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.TaskViewTransitions;
@@ -48,6 +49,8 @@ import com.android.wm.shell.common.TaskStackListenerImpl;
 import com.android.wm.shell.common.TransactionPool;
 import com.android.wm.shell.common.annotations.ShellBackgroundThread;
 import com.android.wm.shell.common.annotations.ShellMainThread;
+import com.android.wm.shell.desktopmode.DesktopModeConstants;
+import com.android.wm.shell.desktopmode.DesktopModeController;
 import com.android.wm.shell.draganddrop.DragAndDropController;
 import com.android.wm.shell.freeform.FreeformComponents;
 import com.android.wm.shell.freeform.FreeformTaskListener;
@@ -573,6 +576,27 @@ public abstract class WMShellModule {
         );
     }
 
+    //
+    // Desktop mode (optional feature)
+    //
+
+    @WMSingleton
+    @Provides
+    static Optional<DesktopModeController> provideDesktopModeController(
+            Context context, ShellInit shellInit,
+            ShellTaskOrganizer shellTaskOrganizer,
+            RootDisplayAreaOrganizer rootDisplayAreaOrganizer,
+            @ShellMainThread Handler mainHandler
+    ) {
+        if (DesktopModeConstants.IS_FEATURE_ENABLED) {
+            return Optional.of(new DesktopModeController(context, shellInit, shellTaskOrganizer,
+                    rootDisplayAreaOrganizer,
+                    mainHandler));
+        } else {
+            return Optional.empty();
+        }
+    }
+
     //
     // Misc
     //
@@ -583,7 +607,8 @@ public abstract class WMShellModule {
     @ShellCreateTriggerOverride
     @Provides
     static Object provideIndependentShellComponentsToCreate(
-            SplitscreenPipMixedHandler splitscreenPipMixedHandler) {
+            SplitscreenPipMixedHandler splitscreenPipMixedHandler,
+            Optional<DesktopModeController> desktopModeController) {
         return new Object();
     }
 }

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopModeConstants.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.desktopmode;
+
+import android.os.SystemProperties;
+
+/**
+ * Constants for desktop mode feature
+ */
+public class DesktopModeConstants {
+
+    /**
+     * Flag to indicate whether desktop mode is available on the device
+     */
+    public static final boolean IS_FEATURE_ENABLED = SystemProperties.getBoolean(
+            "persist.wm.debug.desktop_mode", false);
+}

libs/WindowManager/Shell/src/com/android/wm/shell/desktopmode/DesktopModeController.java

@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.desktopmode;
+
+import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
+import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
+
+import static com.android.wm.shell.protolog.ShellProtoLogGroup.WM_SHELL_DESKTOP_MODE;
+
+import android.content.Context;
+import android.database.ContentObserver;
+import android.net.Uri;
+import android.os.Handler;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.window.WindowContainerTransaction;
+
+import androidx.annotation.Nullable;
+
+import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.protolog.common.ProtoLog;
+import com.android.wm.shell.RootDisplayAreaOrganizer;
+import com.android.wm.shell.ShellTaskOrganizer;
+import com.android.wm.shell.common.annotations.ShellMainThread;
+import com.android.wm.shell.sysui.ShellInit;
+
+/**
+ * Handles windowing changes when desktop mode system setting changes
+ */
+public class DesktopModeController {
+
+    private final Context mContext;
+    private final ShellTaskOrganizer mShellTaskOrganizer;
+    private final RootDisplayAreaOrganizer mRootDisplayAreaOrganizer;
+    private final SettingsObserver mSettingsObserver;
+
+    public DesktopModeController(Context context, ShellInit shellInit,
+            ShellTaskOrganizer shellTaskOrganizer,
+            RootDisplayAreaOrganizer rootDisplayAreaOrganizer,
+            @ShellMainThread Handler mainHandler) {
+        mContext = context;
+        mShellTaskOrganizer = shellTaskOrganizer;
+        mRootDisplayAreaOrganizer = rootDisplayAreaOrganizer;
+        mSettingsObserver = new SettingsObserver(mContext, mainHandler);
+        shellInit.addInitCallback(this::onInit, this);
+    }
+
+    private void onInit() {
+        ProtoLog.d(WM_SHELL_DESKTOP_MODE, "Initialize DesktopModeController");
+        mSettingsObserver.observe();
+    }
+
+    @VisibleForTesting
+    void updateDesktopModeEnabled(boolean enabled) {
+        ProtoLog.d(WM_SHELL_DESKTOP_MODE, "updateDesktopModeState: enabled=%s", enabled);
+
+        int displayId = mContext.getDisplayId();
+
+        WindowContainerTransaction wct = new WindowContainerTransaction();
+        // Reset freeform windowing mode that is set per task level (tasks should inherit
+        // container value)
+        wct.merge(mShellTaskOrganizer.prepareClearFreeformForTasks(displayId), true /* transfer */);
+        int targetWindowingMode;
+        if (enabled) {
+            targetWindowingMode = WINDOWING_MODE_FREEFORM;
+        } else {
+            targetWindowingMode = WINDOWING_MODE_FULLSCREEN;
+            // Clear any resized bounds
+            wct.merge(mShellTaskOrganizer.prepareClearBoundsForTasks(displayId),
+                    true /* transfer */);
+        }
+        wct.merge(mRootDisplayAreaOrganizer.prepareWindowingModeChange(displayId,
+                targetWindowingMode), true /* transfer */);
+        mRootDisplayAreaOrganizer.applyTransaction(wct);
+    }
+
+    /**
+     * A {@link ContentObserver} for listening to changes to {@link Settings.System#DESKTOP_MODE}
+     */
+    private final class SettingsObserver extends ContentObserver {
+
+        private final Uri mDesktopModeSetting = Settings.System.getUriFor(
+                Settings.System.DESKTOP_MODE);
+
+        private final Context mContext;
+
+        SettingsObserver(Context context, Handler handler) {
+            super(handler);
+            mContext = context;
+        }
+
+        public void observe() {
+            // TODO(b/242867463): listen for setting change for all users
+            mContext.getContentResolver().registerContentObserver(mDesktopModeSetting,
+                    false /* notifyForDescendants */, this /* observer */, UserHandle.USER_CURRENT);
+        }
+
+        @Override
+        public void onChange(boolean selfChange, @Nullable Uri uri) {
+            if (mDesktopModeSetting.equals(uri)) {
+                ProtoLog.d(WM_SHELL_DESKTOP_MODE, "Received update for desktop mode setting");
+                desktopModeSettingChanged();
+            }
+        }
+
+        private void desktopModeSettingChanged() {
+            boolean enabled = isDesktopModeEnabled();
+            updateDesktopModeEnabled(enabled);
+        }
+
+        private boolean isDesktopModeEnabled() {
+            try {
+                int result = Settings.System.getIntForUser(mContext.getContentResolver(),
+                        Settings.System.DESKTOP_MODE, UserHandle.USER_CURRENT);
+                ProtoLog.d(WM_SHELL_DESKTOP_MODE, "isDesktopModeEnabled=%s", result);
+                return result != 0;
+            } catch (Settings.SettingNotFoundException e) {
+                ProtoLog.e(WM_SHELL_DESKTOP_MODE, "Failed to read DESKTOP_MODE setting %s", e);
+                return false;
+            }
+        }
+    }
+}

libs/WindowManager/Shell/src/com/android/wm/shell/protolog/ShellProtoLogGroup.java

@@ -46,6 +46,8 @@ public enum ShellProtoLogGroup implements IProtoLogGroup {
             Consts.TAG_WM_SHELL),
     WM_SHELL_SYSUI_EVENTS(Consts.ENABLE_DEBUG, Consts.ENABLE_LOG_TO_PROTO_DEBUG, false,
             Consts.TAG_WM_SHELL),
+    WM_SHELL_DESKTOP_MODE(Consts.ENABLE_DEBUG, Consts.ENABLE_LOG_TO_PROTO_DEBUG, false,
+            Consts.TAG_WM_SHELL),
     TEST_GROUP(true, true, false, "WindowManagerShellProtoLogTest");
 
     private final boolean mEnabled;

libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/CaptionWindowDecoration.java

@@ -34,6 +34,7 @@ import com.android.wm.shell.R;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.common.DisplayController;
 import com.android.wm.shell.common.SyncTransactionQueue;
+import com.android.wm.shell.desktopmode.DesktopModeConstants;
 
 /**
  * Defines visuals and behaviors of a window decoration of a caption bar and shadows. It works with
@@ -163,7 +164,13 @@ public class CaptionWindowDecoration extends WindowDecoration<WindowDecorLinearL
         View caption = mResult.mRootView.findViewById(R.id.caption);
         caption.setOnTouchListener(mOnCaptionTouchListener);
         View maximize = caption.findViewById(R.id.maximize_window);
+        if (DesktopModeConstants.IS_FEATURE_ENABLED) {
+            // Hide maximize button when desktop mode is available
+            maximize.setVisibility(View.GONE);
+        } else {
+            maximize.setVisibility(View.VISIBLE);
             maximize.setOnClickListener(mOnCaptionButtonClickListener);
+        }
         View close = caption.findViewById(R.id.close_window);
         close.setOnClickListener(mOnCaptionButtonClickListener);
         View minimize = caption.findViewById(R.id.minimize_window);

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/ShellTaskOrganizerTests.java

@@ -16,9 +16,11 @@
 
 package com.android.wm.shell;
 
+import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
 import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
+import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.view.Display.DEFAULT_DISPLAY;
 
 import static com.android.dx.mockito.inline.extended.ExtendedMockito.doReturn;
@@ -30,6 +32,8 @@ import static com.android.wm.shell.transition.Transitions.ENABLE_SHELL_TRANSITIO
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotEquals;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 import static org.junit.Assume.assumeFalse;
@@ -38,9 +42,11 @@ import static org.mockito.Mockito.clearInvocations;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
 
 import android.app.ActivityManager.RunningTaskInfo;
 import android.app.TaskInfo;
+import android.app.WindowConfiguration;
 import android.content.LocusId;
 import android.content.pm.ParceledListSlice;
 import android.os.Binder;
@@ -53,6 +59,8 @@ import android.window.ITaskOrganizer;
 import android.window.ITaskOrganizerController;
 import android.window.TaskAppearedInfo;
 import android.window.WindowContainerToken;
+import android.window.WindowContainerTransaction;
+import android.window.WindowContainerTransaction.Change;
 
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.filters.SmallTest;
@@ -628,6 +636,71 @@ public class ShellTaskOrganizerTests extends ShellTestCase {
         verify(mTaskOrganizerController).restartTaskTopActivityProcessIfVisible(task1.token);
     }
 
+    @Test
+    public void testPrepareClearBoundsForTasks() {
+        RunningTaskInfo task1 = createTaskInfo(1, WINDOWING_MODE_UNDEFINED);
+        task1.displayId = 1;
+        MockToken token1 = new MockToken();
+        task1.token = token1.token();
+        mOrganizer.onTaskAppeared(task1, null);
+
+        RunningTaskInfo task2 = createTaskInfo(2, WINDOWING_MODE_UNDEFINED);
+        task2.displayId = 1;
+        MockToken token2 = new MockToken();
+        task2.token = token2.token();
+        mOrganizer.onTaskAppeared(task2, null);
+
+        RunningTaskInfo otherDisplayTask = createTaskInfo(3, WINDOWING_MODE_UNDEFINED);
+        otherDisplayTask.displayId = 2;
+        MockToken otherDisplayToken = new MockToken();
+        otherDisplayTask.token = otherDisplayToken.token();
+        mOrganizer.onTaskAppeared(otherDisplayTask, null);
+
+        WindowContainerTransaction wct = mOrganizer.prepareClearBoundsForTasks(1);
+
+        assertEquals(wct.getChanges().size(), 2);
+        Change boundsChange1 = wct.getChanges().get(token1.binder());
+        assertNotNull(boundsChange1);
+        assertNotEquals(
+                (boundsChange1.getWindowSetMask() & WindowConfiguration.WINDOW_CONFIG_BOUNDS), 0);
+        assertTrue(boundsChange1.getConfiguration().windowConfiguration.getBounds().isEmpty());
+
+        Change boundsChange2 = wct.getChanges().get(token2.binder());
+        assertNotNull(boundsChange2);
+        assertNotEquals(
+                (boundsChange2.getWindowSetMask() & WindowConfiguration.WINDOW_CONFIG_BOUNDS), 0);
+        assertTrue(boundsChange2.getConfiguration().windowConfiguration.getBounds().isEmpty());
+    }
+
+    @Test
+    public void testPrepareClearFreeformForTasks() {
+        RunningTaskInfo task1 = createTaskInfo(1, WINDOWING_MODE_FREEFORM);
+        task1.displayId = 1;
+        MockToken token1 = new MockToken();
+        task1.token = token1.token();
+        mOrganizer.onTaskAppeared(task1, null);
+
+        RunningTaskInfo task2 = createTaskInfo(2, WINDOWING_MODE_MULTI_WINDOW);
+        task2.displayId = 1;
+        MockToken token2 = new MockToken();
+        task2.token = token2.token();
+        mOrganizer.onTaskAppeared(task2, null);
+
+        RunningTaskInfo otherDisplayTask = createTaskInfo(3, WINDOWING_MODE_FREEFORM);
+        otherDisplayTask.displayId = 2;
+        MockToken otherDisplayToken = new MockToken();
+        otherDisplayTask.token = otherDisplayToken.token();
+        mOrganizer.onTaskAppeared(otherDisplayTask, null);
+
+        WindowContainerTransaction wct = mOrganizer.prepareClearFreeformForTasks(1);
+
+        // Only task with freeform windowing mode and the right display should be updated
+        assertEquals(wct.getChanges().size(), 1);
+        Change wmModeChange1 = wct.getChanges().get(token1.binder());
+        assertNotNull(wmModeChange1);
+        assertEquals(wmModeChange1.getWindowingMode(), WINDOWING_MODE_UNDEFINED);
+    }
+
     private static RunningTaskInfo createTaskInfo(int taskId, int windowingMode) {
         RunningTaskInfo taskInfo = new RunningTaskInfo();
         taskInfo.taskId = taskId;
@@ -635,4 +708,22 @@ public class ShellTaskOrganizerTests extends ShellTestCase {
         return taskInfo;
     }
 
+    private static class MockToken {
+        private final WindowContainerToken mToken;
+        private final IBinder mBinder;
+
+        MockToken() {
+            mToken = mock(WindowContainerToken.class);
+            mBinder = mock(IBinder.class);
+            when(mToken.asBinder()).thenReturn(mBinder);
+        }
+
+        WindowContainerToken token() {
+            return mToken;
+        }
+
+        IBinder binder() {
+            return mBinder;
+        }
+    }
 }

libs/WindowManager/Shell/tests/unittest/src/com/android/wm/shell/desktopmode/DesktopModeControllerTest.java

@@ -0,0 +1,194 @@
+/*
+ * Copyright (C) 2022 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.wm.shell.desktopmode;
+
+import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
+import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
+import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import android.app.WindowConfiguration;
+import android.os.Handler;
+import android.os.IBinder;
+import android.testing.AndroidTestingRunner;
+import android.window.WindowContainerToken;
+import android.window.WindowContainerTransaction;
+import android.window.WindowContainerTransaction.Change;
+
+import androidx.test.filters.SmallTest;
+
+import com.android.wm.shell.RootDisplayAreaOrganizer;
+import com.android.wm.shell.ShellTaskOrganizer;
+import com.android.wm.shell.ShellTestCase;
+import com.android.wm.shell.common.ShellExecutor;
+import com.android.wm.shell.sysui.ShellInit;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Mock;
+import org.mockito.Mockito;
+
+@SmallTest
+@RunWith(AndroidTestingRunner.class)
+public class DesktopModeControllerTest extends ShellTestCase {
+
+    @Mock
+    private ShellTaskOrganizer mShellTaskOrganizer;
+    @Mock
+    private RootDisplayAreaOrganizer mRootDisplayAreaOrganizer;
+    @Mock
+    private ShellExecutor mTestExecutor;
+    @Mock
+    private Handler mMockHandler;
+
+    private DesktopModeController mController;
+    private ShellInit mShellInit;
+
+    @Before
+    public void setUp() {
+        mShellInit = Mockito.spy(new ShellInit(mTestExecutor));
+
+        mController = new DesktopModeController(mContext, mShellInit, mShellTaskOrganizer,
+                mRootDisplayAreaOrganizer, mMockHandler);
+
+        mShellInit.init();
+    }
+
+    @Test
+    public void instantiate_addInitCallback() {
+        verify(mShellInit, times(1)).addInitCallback(any(), any());
+    }
+
+    @Test
+    public void testDesktopModeEnabled_taskWmClearedDisplaySetToFreeform() {
+        // Create a fake WCT to simulate setting task windowing mode to undefined
+        WindowContainerTransaction taskWct = new WindowContainerTransaction();
+        MockToken taskMockToken = new MockToken();
+        taskWct.setWindowingMode(taskMockToken.token(), WINDOWING_MODE_UNDEFINED);
+        when(mShellTaskOrganizer.prepareClearFreeformForTasks(mContext.getDisplayId())).thenReturn(
+                taskWct);
+
+        // Create a fake WCT to simulate setting display windowing mode to freeform
+        WindowContainerTransaction displayWct = new WindowContainerTransaction();
+        MockToken displayMockToken = new MockToken();
+        displayWct.setWindowingMode(displayMockToken.token(), WINDOWING_MODE_FREEFORM);
+        when(mRootDisplayAreaOrganizer.prepareWindowingModeChange(mContext.getDisplayId(),
+                WINDOWING_MODE_FREEFORM)).thenReturn(displayWct);
+
+        // The test
+        mController.updateDesktopModeEnabled(true);
+
+        ArgumentCaptor<WindowContainerTransaction> arg = ArgumentCaptor.forClass(
+                WindowContainerTransaction.class);
+        verify(mRootDisplayAreaOrganizer).applyTransaction(arg.capture());
+
+        // WCT should have 2 changes - clear task wm mode and set display wm mode
+        WindowContainerTransaction wct = arg.getValue();
+        assertThat(wct.getChanges()).hasSize(2);
+
+        // Verify executed WCT has a change for setting task windowing mode to undefined
+        Change taskWmModeChange = wct.getChanges().get(taskMockToken.binder());
+        assertThat(taskWmModeChange).isNotNull();
+        assertThat(taskWmModeChange.getWindowingMode()).isEqualTo(WINDOWING_MODE_UNDEFINED);
+
+        // Verify executed WCT has a change for setting display windowing mode to freeform
+        Change displayWmModeChange = wct.getChanges().get(displayMockToken.binder());
+        assertThat(displayWmModeChange).isNotNull();
+        assertThat(displayWmModeChange.getWindowingMode()).isEqualTo(WINDOWING_MODE_FREEFORM);
+    }
+
+    @Test
+    public void testDesktopModeDisabled_taskWmAndBoundsClearedDisplaySetToFullscreen() {
+        // Create a fake WCT to simulate setting task windowing mode to undefined
+        WindowContainerTransaction taskWmWct = new WindowContainerTransaction();
+        MockToken taskWmMockToken = new MockToken();
+        taskWmWct.setWindowingMode(taskWmMockToken.token(), WINDOWING_MODE_UNDEFINED);
+        when(mShellTaskOrganizer.prepareClearFreeformForTasks(mContext.getDisplayId())).thenReturn(
+                taskWmWct);
+
+        // Create a fake WCT to simulate clearing task bounds
+        WindowContainerTransaction taskBoundsWct = new WindowContainerTransaction();
+        MockToken taskBoundsMockToken = new MockToken();
+        taskBoundsWct.setBounds(taskBoundsMockToken.token(), null);
+        when(mShellTaskOrganizer.prepareClearBoundsForTasks(mContext.getDisplayId())).thenReturn(
+                taskBoundsWct);
+
+        // Create a fake WCT to simulate setting display windowing mode to fullscreen
+        WindowContainerTransaction displayWct = new WindowContainerTransaction();
+        MockToken displayMockToken = new MockToken();
+        displayWct.setWindowingMode(displayMockToken.token(), WINDOWING_MODE_FULLSCREEN);
+        when(mRootDisplayAreaOrganizer.prepareWindowingModeChange(mContext.getDisplayId(),
+                WINDOWING_MODE_FULLSCREEN)).thenReturn(displayWct);
+
+        // The test
+        mController.updateDesktopModeEnabled(false);
+
+        ArgumentCaptor<WindowContainerTransaction> arg = ArgumentCaptor.forClass(
+                WindowContainerTransaction.class);
+        verify(mRootDisplayAreaOrganizer).applyTransaction(arg.capture());
+
+        // WCT should have 3 changes - clear task wm mode and bounds and set display wm mode
+        WindowContainerTransaction wct = arg.getValue();
+        assertThat(wct.getChanges()).hasSize(3);
+
+        // Verify executed WCT has a change for setting task windowing mode to undefined
+        Change taskWmModeChange = wct.getChanges().get(taskWmMockToken.binder());
+        assertThat(taskWmModeChange).isNotNull();
+        assertThat(taskWmModeChange.getWindowingMode()).isEqualTo(WINDOWING_MODE_UNDEFINED);
+
+        // Verify executed WCT has a change for clearing task bounds
+        Change taskBoundsChange = wct.getChanges().get(taskBoundsMockToken.binder());
+        assertThat(taskBoundsChange).isNotNull();
+        assertThat(taskBoundsChange.getWindowSetMask()
+                & WindowConfiguration.WINDOW_CONFIG_BOUNDS).isNotEqualTo(0);
+        assertThat(taskBoundsChange.getConfiguration().windowConfiguration.getBounds().isEmpty())
+                .isTrue();
+
+        // Verify executed WCT has a change for setting display windowing mode to fullscreen
+        Change displayWmModeChange = wct.getChanges().get(displayMockToken.binder());
+        assertThat(displayWmModeChange).isNotNull();
+        assertThat(displayWmModeChange.getWindowingMode()).isEqualTo(WINDOWING_MODE_FULLSCREEN);
+    }
+
+    private static class MockToken {
+        private final WindowContainerToken mToken;
+        private final IBinder mBinder;
+
+        MockToken() {
+            mToken = mock(WindowContainerToken.class);
+            mBinder = mock(IBinder.class);
+            when(mToken.asBinder()).thenReturn(mBinder);
+        }
+
+        WindowContainerToken token() {
+            return mToken;
+        }
+
+        IBinder binder() {
+            return mBinder;
+        }
+    }
+}