Remove stagesplit backup package

Bug: 199236198
Test: build pass
Test: pass existing tests
Ignore-AOSP-First: remove whole folder
Change-Id: I8747f314c5e7fa50812d220fdf527874fc654b85
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreen.aidl b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreen.aidl
deleted file mode 100644
index 45f6d3c..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreen.aidl
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import android.app.PendingIntent;
-import android.content.Intent;
-import android.os.Bundle;
-import android.os.UserHandle;
-import android.view.RemoteAnimationAdapter;
-import android.view.RemoteAnimationTarget;
-import android.window.RemoteTransition;
-
-import com.android.wm.shell.stagesplit.ISplitScreenListener;
-
-/**
- * Interface that is exposed to remote callers to manipulate the splitscreen feature.
- */
-interface ISplitScreen {
-
-    /**
-     * Registers a split screen listener.
-     */
-    oneway void registerSplitScreenListener(in ISplitScreenListener listener) = 1;
-
-    /**
-     * Unregisters a split screen listener.
-     */
-    oneway void unregisterSplitScreenListener(in ISplitScreenListener listener) = 2;
-
-    /**
-     * Hides the side-stage if it is currently visible.
-     */
-    oneway void setSideStageVisibility(boolean visible) = 3;
-
-    /**
-     * Removes a task from the side stage.
-     */
-    oneway void removeFromSideStage(int taskId) = 4;
-
-    /**
-     * Removes the split-screen stages and leaving indicated task to top. Passing INVALID_TASK_ID
-     * to indicate leaving no top task after leaving split-screen.
-     */
-    oneway void exitSplitScreen(int toTopTaskId) = 5;
-
-    /**
-     * @param exitSplitScreenOnHide if to exit split-screen if both stages are not visible.
-     */
-    oneway void exitSplitScreenOnHide(boolean exitSplitScreenOnHide) = 6;
-
-    /**
-     * Starts a task in a stage.
-     */
-    oneway void startTask(int taskId, int stage, int position, in Bundle options) = 7;
-
-    /**
-     * Starts a shortcut in a stage.
-     */
-    oneway void startShortcut(String packageName, String shortcutId, int stage, int position,
-            in Bundle options, in UserHandle user) = 8;
-
-    /**
-     * Starts an activity in a stage.
-     */
-    oneway void startIntent(in PendingIntent intent, in Intent fillInIntent, int stage,
-            int position, in Bundle options) = 9;
-
-    /**
-     * Starts tasks simultaneously in one transition.
-     */
-    oneway void startTasks(int mainTaskId, in Bundle mainOptions, int sideTaskId,
-            in Bundle sideOptions, int sidePosition, in RemoteTransition remoteTransition) = 10;
-
-    /**
-     * Version of startTasks using legacy transition system.
-     */
-     oneway void startTasksWithLegacyTransition(int mainTaskId, in Bundle mainOptions,
-                            int sideTaskId, in Bundle sideOptions, int sidePosition,
-                            in RemoteAnimationAdapter adapter) = 11;
-
-    /**
-     * Blocking call that notifies and gets additional split-screen targets when entering
-     * recents (for example: the dividerBar).
-     * @param cancel is true if leaving recents back to split (eg. the gesture was cancelled).
-     * @param appTargets apps that will be re-parented to display area
-     */
-    RemoteAnimationTarget[] onGoingToRecentsLegacy(boolean cancel,
-                                                   in RemoteAnimationTarget[] appTargets) = 12;
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreenListener.aidl b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreenListener.aidl
deleted file mode 100644
index 46e4299..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/ISplitScreenListener.aidl
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-/**
- * Listener interface that Launcher attaches to SystemUI to get split-screen callbacks.
- */
-oneway interface ISplitScreenListener {
-
-    /**
-     * Called when the stage position changes.
-     */
-    void onStagePositionChanged(int stage, int position);
-
-    /**
-     * Called when a task changes stages.
-     */
-    void onTaskStageChanged(int taskId, int stage, boolean visible);
-}
\ No newline at end of file
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/MainStage.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/MainStage.java
deleted file mode 100644
index 83855be..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/MainStage.java
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
-
-import android.annotation.Nullable;
-import android.graphics.Rect;
-import android.view.SurfaceSession;
-import android.window.WindowContainerToken;
-import android.window.WindowContainerTransaction;
-
-import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.SyncTransactionQueue;
-
-/**
- * Main stage for split-screen mode. When split-screen is active all standard activity types launch
- * on the main stage, except for task that are explicitly pinned to the {@link SideStage}.
- * @see StageCoordinator
- */
-class MainStage extends StageTaskListener {
-    private static final String TAG = MainStage.class.getSimpleName();
-
-    private boolean mIsActive = false;
-
-    MainStage(ShellTaskOrganizer taskOrganizer, int displayId,
-            StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
-            @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
-        super(taskOrganizer, displayId, callbacks, syncQueue, surfaceSession,
-                stageTaskUnfoldController);
-    }
-
-    boolean isActive() {
-        return mIsActive;
-    }
-
-    void activate(Rect rootBounds, WindowContainerTransaction wct) {
-        if (mIsActive) return;
-
-        final WindowContainerToken rootToken = mRootTaskInfo.token;
-        wct.setBounds(rootToken, rootBounds)
-                .setWindowingMode(rootToken, WINDOWING_MODE_MULTI_WINDOW)
-                .setLaunchRoot(
-                        rootToken,
-                        CONTROLLED_WINDOWING_MODES,
-                        CONTROLLED_ACTIVITY_TYPES)
-                .reparentTasks(
-                        null /* currentParent */,
-                        rootToken,
-                        CONTROLLED_WINDOWING_MODES,
-                        CONTROLLED_ACTIVITY_TYPES,
-                        true /* onTop */)
-                // Moving the root task to top after the child tasks were re-parented , or the root
-                // task cannot be visible and focused.
-                .reorder(rootToken, true /* onTop */);
-
-        mIsActive = true;
-    }
-
-    void deactivate(WindowContainerTransaction wct) {
-        deactivate(wct, false /* toTop */);
-    }
-
-    void deactivate(WindowContainerTransaction wct, boolean toTop) {
-        if (!mIsActive) return;
-        mIsActive = false;
-
-        if (mRootTaskInfo == null) return;
-        final WindowContainerToken rootToken = mRootTaskInfo.token;
-        wct.setLaunchRoot(
-                        rootToken,
-                        null,
-                        null)
-                .reparentTasks(
-                        rootToken,
-                        null /* newParent */,
-                        CONTROLLED_WINDOWING_MODES_WHEN_ACTIVE,
-                        CONTROLLED_ACTIVITY_TYPES,
-                        toTop)
-                // We want this re-order to the bottom regardless since we are re-parenting
-                // all its tasks.
-                .reorder(rootToken, false /* onTop */);
-    }
-
-    void updateConfiguration(int windowingMode, Rect bounds, WindowContainerTransaction wct) {
-        wct.setBounds(mRootTaskInfo.token, bounds)
-                .setWindowingMode(mRootTaskInfo.token, windowingMode);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OWNERS b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OWNERS
deleted file mode 100644
index 264e88f..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OWNERS
+++ /dev/null
@@ -1,2 +0,0 @@
-# WM shell sub-modules stagesplit owner
-chenghsiuchang@google.com
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineManager.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineManager.java
deleted file mode 100644
index 8fbad52..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineManager.java
+++ /dev/null
@@ -1,181 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
-import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
-import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_NO_MOVE_ANIMATION;
-import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_TRUSTED_OVERLAY;
-import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
-
-import android.annotation.Nullable;
-import android.content.Context;
-import android.content.res.Configuration;
-import android.graphics.PixelFormat;
-import android.graphics.Rect;
-import android.os.Binder;
-import android.view.IWindow;
-import android.view.InsetsSource;
-import android.view.InsetsState;
-import android.view.LayoutInflater;
-import android.view.SurfaceControl;
-import android.view.SurfaceControlViewHost;
-import android.view.View;
-import android.view.ViewGroup;
-import android.view.WindowManager;
-import android.view.WindowlessWindowManager;
-import android.widget.FrameLayout;
-
-import com.android.wm.shell.R;
-
-/**
- * Handles drawing outline of the bounds of provided root surface. The outline will be drown with
- * the consideration of display insets like status bar, navigation bar and display cutout.
- */
-class OutlineManager extends WindowlessWindowManager {
-    private static final String WINDOW_NAME = "SplitOutlineLayer";
-    private final Context mContext;
-    private final Rect mRootBounds = new Rect();
-    private final Rect mTempRect = new Rect();
-    private final Rect mLastOutlineBounds = new Rect();
-    private final InsetsState mInsetsState = new InsetsState();
-    private final int mExpandedTaskBarHeight;
-    private OutlineView mOutlineView;
-    private SurfaceControlViewHost mViewHost;
-    private SurfaceControl mHostLeash;
-    private SurfaceControl mLeash;
-
-    OutlineManager(Context context, Configuration configuration) {
-        super(configuration, null /* rootSurface */, null /* hostInputToken */);
-        mContext = context.createWindowContext(context.getDisplay(), TYPE_APPLICATION_OVERLAY,
-                null /* options */);
-        mExpandedTaskBarHeight = mContext.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.taskbar_frame_height);
-    }
-
-    @Override
-    protected void attachToParentSurface(IWindow window, SurfaceControl.Builder b) {
-        b.setParent(mHostLeash);
-    }
-
-    void inflate(SurfaceControl rootLeash, Rect rootBounds) {
-        if (mLeash != null || mViewHost != null) return;
-
-        mHostLeash = rootLeash;
-        mRootBounds.set(rootBounds);
-        mViewHost = new SurfaceControlViewHost(mContext, mContext.getDisplay(), this);
-
-        final FrameLayout rootLayout = (FrameLayout) LayoutInflater.from(mContext)
-                .inflate(R.layout.split_outline, null);
-        mOutlineView = rootLayout.findViewById(R.id.split_outline);
-
-        final WindowManager.LayoutParams lp = new WindowManager.LayoutParams(
-                0 /* width */, 0 /* height */, TYPE_APPLICATION_OVERLAY,
-                FLAG_NOT_FOCUSABLE | FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT);
-        lp.width = mRootBounds.width();
-        lp.height = mRootBounds.height();
-        lp.token = new Binder();
-        lp.setTitle(WINDOW_NAME);
-        lp.privateFlags |= PRIVATE_FLAG_NO_MOVE_ANIMATION | PRIVATE_FLAG_TRUSTED_OVERLAY;
-        // TODO(b/189839391): Set INPUT_FEATURE_NO_INPUT_CHANNEL after WM supports
-        //  TRUSTED_OVERLAY for windowless window without input channel.
-        mViewHost.setView(rootLayout, lp);
-        mLeash = getSurfaceControl(mViewHost.getWindowToken());
-
-        drawOutline();
-    }
-
-    void release() {
-        if (mViewHost != null) {
-            mViewHost.release();
-            mViewHost = null;
-        }
-        mRootBounds.setEmpty();
-        mLastOutlineBounds.setEmpty();
-        mOutlineView = null;
-        mHostLeash = null;
-        mLeash = null;
-    }
-
-    @Nullable
-    SurfaceControl getOutlineLeash() {
-        return mLeash;
-    }
-
-    void setVisibility(boolean visible) {
-        if (mOutlineView != null) {
-            mOutlineView.setVisibility(visible ? View.VISIBLE : View.INVISIBLE);
-        }
-    }
-
-    void setRootBounds(Rect rootBounds) {
-        if (mViewHost == null || mViewHost.getView() == null) {
-            return;
-        }
-
-        if (!mRootBounds.equals(rootBounds)) {
-            WindowManager.LayoutParams lp =
-                    (WindowManager.LayoutParams) mViewHost.getView().getLayoutParams();
-            lp.width = rootBounds.width();
-            lp.height = rootBounds.height();
-            mViewHost.relayout(lp);
-            mRootBounds.set(rootBounds);
-            drawOutline();
-        }
-    }
-
-    void onInsetsChanged(InsetsState insetsState) {
-        if (!mInsetsState.equals(insetsState)) {
-            mInsetsState.set(insetsState);
-            drawOutline();
-        }
-    }
-
-    private void computeOutlineBounds(Rect rootBounds, InsetsState insetsState, Rect outBounds) {
-        outBounds.set(rootBounds);
-        final InsetsSource taskBarInsetsSource =
-                insetsState.getSource(InsetsState.ITYPE_EXTRA_NAVIGATION_BAR);
-        // Only insets the divider bar with task bar when it's expanded so that the rounded corners
-        // will be drawn against task bar.
-        if (taskBarInsetsSource.getFrame().height() >= mExpandedTaskBarHeight) {
-            outBounds.inset(taskBarInsetsSource.calculateVisibleInsets(outBounds));
-        }
-
-        // Offset the coordinate from screen based to surface based.
-        outBounds.offset(-rootBounds.left, -rootBounds.top);
-    }
-
-    void drawOutline() {
-        if (mOutlineView == null) {
-            return;
-        }
-
-        computeOutlineBounds(mRootBounds, mInsetsState, mTempRect);
-        if (mTempRect.equals(mLastOutlineBounds)) {
-            return;
-        }
-
-        ViewGroup.MarginLayoutParams lp =
-                (ViewGroup.MarginLayoutParams) mOutlineView.getLayoutParams();
-        lp.leftMargin = mTempRect.left;
-        lp.topMargin = mTempRect.top;
-        lp.width = mTempRect.width();
-        lp.height = mTempRect.height();
-        mOutlineView.setLayoutParams(lp);
-        mLastOutlineBounds.set(mTempRect);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineView.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineView.java
deleted file mode 100644
index 92b1381..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/OutlineView.java
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import static android.view.RoundedCorner.POSITION_BOTTOM_LEFT;
-import static android.view.RoundedCorner.POSITION_BOTTOM_RIGHT;
-import static android.view.RoundedCorner.POSITION_TOP_LEFT;
-import static android.view.RoundedCorner.POSITION_TOP_RIGHT;
-
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Paint;
-import android.graphics.Path;
-import android.util.AttributeSet;
-import android.view.RoundedCorner;
-import android.view.View;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-import com.android.internal.R;
-
-/** View for drawing split outline. */
-public class OutlineView extends View {
-    private final Paint mPaint = new Paint();
-    private final Path mPath = new Path();
-    private final float[] mRadii = new float[8];
-
-    public OutlineView(@NonNull Context context, @Nullable AttributeSet attrs) {
-        super(context, attrs);
-        mPaint.setStyle(Paint.Style.STROKE);
-        mPaint.setStrokeWidth(
-                getResources().getDimension(R.dimen.accessibility_focus_highlight_stroke_width));
-        mPaint.setColor(getResources().getColor(R.color.system_accent1_100, null));
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        // TODO(b/200850654): match the screen corners with the actual display decor.
-        mRadii[0] = mRadii[1] = getCornerRadius(POSITION_TOP_LEFT);
-        mRadii[2] = mRadii[3] = getCornerRadius(POSITION_TOP_RIGHT);
-        mRadii[4] = mRadii[5] = getCornerRadius(POSITION_BOTTOM_RIGHT);
-        mRadii[6] = mRadii[7] = getCornerRadius(POSITION_BOTTOM_LEFT);
-    }
-
-    private int getCornerRadius(@RoundedCorner.Position int position) {
-        final RoundedCorner roundedCorner = getDisplay().getRoundedCorner(position);
-        return roundedCorner == null ? 0 : roundedCorner.getRadius();
-    }
-
-    @Override
-    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
-        if (changed) {
-            mPath.reset();
-            mPath.addRoundRect(0, 0, getWidth(), getHeight(), mRadii, Path.Direction.CW);
-        }
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        canvas.drawPath(mPath, mPaint);
-    }
-
-    @Override
-    public boolean hasOverlappingRendering() {
-        return false;
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SideStage.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SideStage.java
deleted file mode 100644
index 55c4f3a..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SideStage.java
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import android.annotation.CallSuper;
-import android.annotation.Nullable;
-import android.app.ActivityManager;
-import android.content.Context;
-import android.graphics.Rect;
-import android.view.InsetsSourceControl;
-import android.view.InsetsState;
-import android.view.SurfaceControl;
-import android.view.SurfaceSession;
-import android.window.WindowContainerToken;
-import android.window.WindowContainerTransaction;
-
-import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.DisplayInsetsController;
-import com.android.wm.shell.common.SyncTransactionQueue;
-
-/**
- * Side stage for split-screen mode. Only tasks that are explicitly pinned to this stage show up
- * here. All other task are launch in the {@link MainStage}.
- *
- * @see StageCoordinator
- */
-class SideStage extends StageTaskListener implements
-        DisplayInsetsController.OnInsetsChangedListener {
-    private static final String TAG = SideStage.class.getSimpleName();
-    private final Context mContext;
-    private OutlineManager mOutlineManager;
-
-    SideStage(Context context, ShellTaskOrganizer taskOrganizer, int displayId,
-            StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
-            @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
-        super(taskOrganizer, displayId, callbacks, syncQueue, surfaceSession,
-                stageTaskUnfoldController);
-        mContext = context;
-    }
-
-    void addTask(ActivityManager.RunningTaskInfo task, Rect rootBounds,
-            WindowContainerTransaction wct) {
-        final WindowContainerToken rootToken = mRootTaskInfo.token;
-        wct.setBounds(rootToken, rootBounds)
-                .reparent(task.token, rootToken, true /* onTop*/)
-                // Moving the root task to top after the child tasks were reparented , or the root
-                // task cannot be visible and focused.
-                .reorder(rootToken, true /* onTop */);
-    }
-
-    boolean removeAllTasks(WindowContainerTransaction wct, boolean toTop) {
-        // No matter if the root task is empty or not, moving the root to bottom because it no
-        // longer preserves visible child task.
-        wct.reorder(mRootTaskInfo.token, false /* onTop */);
-        if (mChildrenTaskInfo.size() == 0) return false;
-        wct.reparentTasks(
-                mRootTaskInfo.token,
-                null /* newParent */,
-                CONTROLLED_WINDOWING_MODES_WHEN_ACTIVE,
-                CONTROLLED_ACTIVITY_TYPES,
-                toTop);
-        return true;
-    }
-
-    boolean removeTask(int taskId, WindowContainerToken newParent, WindowContainerTransaction wct) {
-        final ActivityManager.RunningTaskInfo task = mChildrenTaskInfo.get(taskId);
-        if (task == null) return false;
-        wct.reparent(task.token, newParent, false /* onTop */);
-        return true;
-    }
-
-    @Nullable
-    public SurfaceControl getOutlineLeash() {
-        return mOutlineManager.getOutlineLeash();
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskAppeared(ActivityManager.RunningTaskInfo taskInfo, SurfaceControl leash) {
-        super.onTaskAppeared(taskInfo, leash);
-        if (isRootTask(taskInfo)) {
-            mOutlineManager = new OutlineManager(mContext, taskInfo.configuration);
-            enableOutline(true);
-        }
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskInfoChanged(ActivityManager.RunningTaskInfo taskInfo) {
-        super.onTaskInfoChanged(taskInfo);
-        if (isRootTask(taskInfo)) {
-            mOutlineManager.setRootBounds(taskInfo.configuration.windowConfiguration.getBounds());
-        }
-    }
-
-    private boolean isRootTask(ActivityManager.RunningTaskInfo taskInfo) {
-        return mRootTaskInfo != null && mRootTaskInfo.taskId == taskInfo.taskId;
-    }
-
-    void enableOutline(boolean enable) {
-        if (mOutlineManager == null) {
-            return;
-        }
-
-        if (enable) {
-            if (mRootTaskInfo != null) {
-                mOutlineManager.inflate(mRootLeash,
-                        mRootTaskInfo.configuration.windowConfiguration.getBounds());
-            }
-        } else {
-            mOutlineManager.release();
-        }
-    }
-
-    void setOutlineVisibility(boolean visible) {
-        mOutlineManager.setVisibility(visible);
-    }
-
-    @Override
-    public void insetsChanged(InsetsState insetsState) {
-        mOutlineManager.onInsetsChanged(insetsState);
-    }
-
-    @Override
-    public void insetsControlChanged(InsetsState insetsState,
-            InsetsSourceControl[] activeControls) {
-        insetsChanged(insetsState);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreen.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreen.java
deleted file mode 100644
index c5d2312..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreen.java
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import android.annotation.IntDef;
-import android.annotation.NonNull;
-
-import com.android.wm.shell.common.annotations.ExternalThread;
-import com.android.wm.shell.common.split.SplitScreenConstants.SplitPosition;
-
-import java.util.concurrent.Executor;
-
-/**
- * Interface to engage split-screen feature.
- * TODO: Figure out which of these are actually needed outside of the Shell
- */
-@ExternalThread
-public interface SplitScreen {
-    /**
-     * Stage type isn't specified normally meaning to use what ever the default is.
-     * E.g. exit split-screen and launch the app in fullscreen.
-     */
-    int STAGE_TYPE_UNDEFINED = -1;
-    /**
-     * The main stage type.
-     * @see MainStage
-     */
-    int STAGE_TYPE_MAIN = 0;
-
-    /**
-     * The side stage type.
-     * @see SideStage
-     */
-    int STAGE_TYPE_SIDE = 1;
-
-    @IntDef(prefix = { "STAGE_TYPE_" }, value = {
-            STAGE_TYPE_UNDEFINED,
-            STAGE_TYPE_MAIN,
-            STAGE_TYPE_SIDE
-    })
-    @interface StageType {}
-
-    /** Callback interface for listening to changes in a split-screen stage. */
-    interface SplitScreenListener {
-        default void onStagePositionChanged(@StageType int stage, @SplitPosition int position) {}
-        default void onTaskStageChanged(int taskId, @StageType int stage, boolean visible) {}
-        default void onSplitVisibilityChanged(boolean visible) {}
-    }
-
-    /** Registers listener that gets split screen callback. */
-    void registerSplitScreenListener(@NonNull SplitScreenListener listener,
-            @NonNull Executor executor);
-
-    /** Unregisters listener that gets split screen callback. */
-    void unregisterSplitScreenListener(@NonNull SplitScreenListener listener);
-
-    /**
-     * Returns a binder that can be passed to an external process to manipulate SplitScreen.
-     */
-    default ISplitScreen createExternalInterface() {
-        return null;
-    }
-
-    /**
-     * Called when the keyguard occluded state changes.
-     * @param occluded Indicates if the keyguard is now occluded.
-     */
-    void onKeyguardOccludedChanged(boolean occluded);
-
-    /**
-     * Called when the visibility of the keyguard changes.
-     * @param showing Indicates if the keyguard is now visible.
-     */
-    void onKeyguardVisibilityChanged(boolean showing);
-
-    /** Get a string representation of a stage type */
-    static String stageTypeToString(@StageType int stage) {
-        switch (stage) {
-            case STAGE_TYPE_UNDEFINED: return "UNDEFINED";
-            case STAGE_TYPE_MAIN: return "MAIN";
-            case STAGE_TYPE_SIDE: return "SIDE";
-            default: return "UNKNOWN(" + stage + ")";
-        }
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenController.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenController.java
deleted file mode 100644
index 0717405..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenController.java
+++ /dev/null
@@ -1,595 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import static android.view.Display.DEFAULT_DISPLAY;
-import static android.view.RemoteAnimationTarget.MODE_OPENING;
-
-import static com.android.wm.shell.common.ExecutorUtils.executeRemoteCallWithTaskPermission;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_BOTTOM_OR_RIGHT;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT;
-import static com.android.wm.shell.splitscreen.SplitScreen.STAGE_TYPE_UNDEFINED;
-
-import android.app.ActivityManager;
-import android.app.ActivityTaskManager;
-import android.app.PendingIntent;
-import android.content.ActivityNotFoundException;
-import android.content.Context;
-import android.content.Intent;
-import android.content.pm.LauncherApps;
-import android.graphics.Rect;
-import android.os.Bundle;
-import android.os.IBinder;
-import android.os.RemoteException;
-import android.os.UserHandle;
-import android.util.ArrayMap;
-import android.util.Slog;
-import android.view.IRemoteAnimationFinishedCallback;
-import android.view.RemoteAnimationAdapter;
-import android.view.RemoteAnimationTarget;
-import android.view.SurfaceControl;
-import android.view.SurfaceSession;
-import android.view.WindowManager;
-import android.window.RemoteTransition;
-import android.window.WindowContainerTransaction;
-
-import androidx.annotation.BinderThread;
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
-import com.android.internal.logging.InstanceId;
-import com.android.internal.util.FrameworkStatsLog;
-import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
-import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.DisplayImeController;
-import com.android.wm.shell.common.DisplayInsetsController;
-import com.android.wm.shell.common.RemoteCallable;
-import com.android.wm.shell.common.ShellExecutor;
-import com.android.wm.shell.common.SyncTransactionQueue;
-import com.android.wm.shell.common.TransactionPool;
-import com.android.wm.shell.common.annotations.ExternalThread;
-import com.android.wm.shell.common.split.SplitScreenConstants.SplitPosition;
-import com.android.wm.shell.draganddrop.DragAndDropPolicy;
-import com.android.wm.shell.transition.LegacyTransitions;
-import com.android.wm.shell.transition.Transitions;
-
-import java.io.PrintWriter;
-import java.util.Arrays;
-import java.util.Optional;
-import java.util.concurrent.Executor;
-
-import javax.inject.Provider;
-
-/**
- * Class manages split-screen multitasking mode and implements the main interface
- * {@link SplitScreen}.
- * @see StageCoordinator
- */
-// TODO(b/198577848): Implement split screen flicker test to consolidate CUJ of split screen.
-public class SplitScreenController implements DragAndDropPolicy.Starter,
-        RemoteCallable<SplitScreenController> {
-    private static final String TAG = SplitScreenController.class.getSimpleName();
-
-    private final ShellTaskOrganizer mTaskOrganizer;
-    private final SyncTransactionQueue mSyncQueue;
-    private final Context mContext;
-    private final RootTaskDisplayAreaOrganizer mRootTDAOrganizer;
-    private final ShellExecutor mMainExecutor;
-    private final SplitScreenImpl mImpl = new SplitScreenImpl();
-    private final DisplayImeController mDisplayImeController;
-    private final DisplayInsetsController mDisplayInsetsController;
-    private final Transitions mTransitions;
-    private final TransactionPool mTransactionPool;
-    private final SplitscreenEventLogger mLogger;
-    private final Provider<Optional<StageTaskUnfoldController>> mUnfoldControllerProvider;
-
-    private StageCoordinator mStageCoordinator;
-
-    public SplitScreenController(ShellTaskOrganizer shellTaskOrganizer,
-            SyncTransactionQueue syncQueue, Context context,
-            RootTaskDisplayAreaOrganizer rootTDAOrganizer,
-            ShellExecutor mainExecutor, DisplayImeController displayImeController,
-            DisplayInsetsController displayInsetsController,
-            Transitions transitions, TransactionPool transactionPool,
-            Provider<Optional<StageTaskUnfoldController>> unfoldControllerProvider) {
-        mTaskOrganizer = shellTaskOrganizer;
-        mSyncQueue = syncQueue;
-        mContext = context;
-        mRootTDAOrganizer = rootTDAOrganizer;
-        mMainExecutor = mainExecutor;
-        mDisplayImeController = displayImeController;
-        mDisplayInsetsController = displayInsetsController;
-        mTransitions = transitions;
-        mTransactionPool = transactionPool;
-        mUnfoldControllerProvider = unfoldControllerProvider;
-        mLogger = new SplitscreenEventLogger();
-    }
-
-    public SplitScreen asSplitScreen() {
-        return mImpl;
-    }
-
-    @Override
-    public Context getContext() {
-        return mContext;
-    }
-
-    @Override
-    public ShellExecutor getRemoteCallExecutor() {
-        return mMainExecutor;
-    }
-
-    public void onOrganizerRegistered() {
-        if (mStageCoordinator == null) {
-            // TODO: Multi-display
-            mStageCoordinator = new StageCoordinator(mContext, DEFAULT_DISPLAY, mSyncQueue,
-                    mRootTDAOrganizer, mTaskOrganizer, mDisplayImeController,
-                    mDisplayInsetsController, mTransitions, mTransactionPool, mLogger,
-                    mUnfoldControllerProvider);
-        }
-    }
-
-    public boolean isSplitScreenVisible() {
-        return mStageCoordinator.isSplitScreenVisible();
-    }
-
-    public boolean moveToSideStage(int taskId, @SplitPosition int sideStagePosition) {
-        final ActivityManager.RunningTaskInfo task = mTaskOrganizer.getRunningTaskInfo(taskId);
-        if (task == null) {
-            throw new IllegalArgumentException("Unknown taskId" + taskId);
-        }
-        return moveToSideStage(task, sideStagePosition);
-    }
-
-    public boolean moveToSideStage(ActivityManager.RunningTaskInfo task,
-            @SplitPosition int sideStagePosition) {
-        return mStageCoordinator.moveToSideStage(task, sideStagePosition);
-    }
-
-    public boolean removeFromSideStage(int taskId) {
-        return mStageCoordinator.removeFromSideStage(taskId);
-    }
-
-    public void setSideStageOutline(boolean enable) {
-        mStageCoordinator.setSideStageOutline(enable);
-    }
-
-    public void setSideStagePosition(@SplitPosition int sideStagePosition) {
-        mStageCoordinator.setSideStagePosition(sideStagePosition, null /* wct */);
-    }
-
-    public void setSideStageVisibility(boolean visible) {
-        mStageCoordinator.setSideStageVisibility(visible);
-    }
-
-    public void enterSplitScreen(int taskId, boolean leftOrTop) {
-        moveToSideStage(taskId,
-                leftOrTop ? SPLIT_POSITION_TOP_OR_LEFT : SPLIT_POSITION_BOTTOM_OR_RIGHT);
-    }
-
-    public void exitSplitScreen(int toTopTaskId, int exitReason) {
-        mStageCoordinator.exitSplitScreen(toTopTaskId, exitReason);
-    }
-
-    public void onKeyguardOccludedChanged(boolean occluded) {
-        mStageCoordinator.onKeyguardOccludedChanged(occluded);
-    }
-
-    public void onKeyguardVisibilityChanged(boolean showing) {
-        mStageCoordinator.onKeyguardVisibilityChanged(showing);
-    }
-
-    public void exitSplitScreenOnHide(boolean exitSplitScreenOnHide) {
-        mStageCoordinator.exitSplitScreenOnHide(exitSplitScreenOnHide);
-    }
-
-    public void getStageBounds(Rect outTopOrLeftBounds, Rect outBottomOrRightBounds) {
-        mStageCoordinator.getStageBounds(outTopOrLeftBounds, outBottomOrRightBounds);
-    }
-
-    public void registerSplitScreenListener(SplitScreen.SplitScreenListener listener) {
-        mStageCoordinator.registerSplitScreenListener(listener);
-    }
-
-    public void unregisterSplitScreenListener(SplitScreen.SplitScreenListener listener) {
-        mStageCoordinator.unregisterSplitScreenListener(listener);
-    }
-
-    public void startTask(int taskId, @SplitPosition int position, @Nullable Bundle options) {
-        options = mStageCoordinator.resolveStartStage(STAGE_TYPE_UNDEFINED, position, options,
-                null /* wct */);
-
-        try {
-            ActivityTaskManager.getService().startActivityFromRecents(taskId, options);
-        } catch (RemoteException e) {
-            Slog.e(TAG, "Failed to launch task", e);
-        }
-    }
-
-    public void startShortcut(String packageName, String shortcutId, @SplitPosition int position,
-            @Nullable Bundle options, UserHandle user) {
-        options = mStageCoordinator.resolveStartStage(STAGE_TYPE_UNDEFINED, position, options,
-                null /* wct */);
-
-        try {
-            LauncherApps launcherApps =
-                    mContext.getSystemService(LauncherApps.class);
-            launcherApps.startShortcut(packageName, shortcutId, null /* sourceBounds */,
-                    options, user);
-        } catch (ActivityNotFoundException e) {
-            Slog.e(TAG, "Failed to launch shortcut", e);
-        }
-    }
-
-    public void startIntent(PendingIntent intent, Intent fillInIntent, @SplitPosition int position,
-            @Nullable Bundle options) {
-        if (!Transitions.ENABLE_SHELL_TRANSITIONS) {
-            startIntentLegacy(intent, fillInIntent, position, options);
-            return;
-        }
-        mStageCoordinator.startIntent(intent, fillInIntent, STAGE_TYPE_UNDEFINED, position, options,
-                null /* remote */);
-    }
-
-    private void startIntentLegacy(PendingIntent intent, Intent fillInIntent,
-            @SplitPosition int position, @Nullable Bundle options) {
-        LegacyTransitions.ILegacyTransition transition = new LegacyTransitions.ILegacyTransition() {
-            @Override
-            public void onAnimationStart(int transit, RemoteAnimationTarget[] apps,
-                    RemoteAnimationTarget[] wallpapers, RemoteAnimationTarget[] nonApps,
-                    IRemoteAnimationFinishedCallback finishedCallback,
-                    SurfaceControl.Transaction t) {
-                mStageCoordinator.updateSurfaceBounds(null /* layout */, t,
-                        false /* applyResizingOffset */);
-
-                if (apps != null) {
-                    for (int i = 0; i < apps.length; ++i) {
-                        if (apps[i].mode == MODE_OPENING) {
-                            t.show(apps[i].leash);
-                        }
-                    }
-                }
-
-                t.apply();
-                if (finishedCallback != null) {
-                    try {
-                        finishedCallback.onAnimationFinished();
-                    } catch (RemoteException e) {
-                        Slog.e(TAG, "Error finishing legacy transition: ", e);
-                    }
-                }
-            }
-        };
-        WindowContainerTransaction wct = new WindowContainerTransaction();
-        options = mStageCoordinator.resolveStartStage(STAGE_TYPE_UNDEFINED, position, options, wct);
-        wct.sendPendingIntent(intent, fillInIntent, options);
-        mSyncQueue.queue(transition, WindowManager.TRANSIT_OPEN, wct);
-    }
-
-    RemoteAnimationTarget[] onGoingToRecentsLegacy(boolean cancel, RemoteAnimationTarget[] apps) {
-        if (!isSplitScreenVisible()) return null;
-        final SurfaceControl.Builder builder = new SurfaceControl.Builder(new SurfaceSession())
-                .setContainerLayer()
-                .setName("RecentsAnimationSplitTasks")
-                .setHidden(false)
-                .setCallsite("SplitScreenController#onGoingtoRecentsLegacy");
-        mRootTDAOrganizer.attachToDisplayArea(DEFAULT_DISPLAY, builder);
-        SurfaceControl sc = builder.build();
-        SurfaceControl.Transaction transaction = new SurfaceControl.Transaction();
-
-        // Ensure that we order these in the parent in the right z-order as their previous order
-        Arrays.sort(apps, (a1, a2) -> a1.prefixOrderIndex - a2.prefixOrderIndex);
-        int layer = 1;
-        for (RemoteAnimationTarget appTarget : apps) {
-            transaction.reparent(appTarget.leash, sc);
-            transaction.setPosition(appTarget.leash, appTarget.screenSpaceBounds.left,
-                    appTarget.screenSpaceBounds.top);
-            transaction.setLayer(appTarget.leash, layer++);
-        }
-        transaction.apply();
-        transaction.close();
-        return new RemoteAnimationTarget[]{
-                mStageCoordinator.getDividerBarLegacyTarget(),
-                mStageCoordinator.getOutlineLegacyTarget()};
-    }
-
-    /**
-     * Sets drag info to be logged when splitscreen is entered.
-     */
-    public void logOnDroppedToSplit(@SplitPosition int position, InstanceId dragSessionId) {
-        mStageCoordinator.logOnDroppedToSplit(position, dragSessionId);
-    }
-
-    public void dump(@NonNull PrintWriter pw, String prefix) {
-        pw.println(prefix + TAG);
-        if (mStageCoordinator != null) {
-            mStageCoordinator.dump(pw, prefix);
-        }
-    }
-
-    /**
-     * The interface for calls from outside the Shell, within the host process.
-     */
-    @ExternalThread
-    private class SplitScreenImpl implements SplitScreen {
-        private ISplitScreenImpl mISplitScreen;
-        private final ArrayMap<SplitScreenListener, Executor> mExecutors = new ArrayMap<>();
-        private final SplitScreenListener mListener = new SplitScreenListener() {
-            @Override
-            public void onStagePositionChanged(int stage, int position) {
-                for (int i = 0; i < mExecutors.size(); i++) {
-                    final int index = i;
-                    mExecutors.valueAt(index).execute(() -> {
-                        mExecutors.keyAt(index).onStagePositionChanged(stage, position);
-                    });
-                }
-            }
-
-            @Override
-            public void onTaskStageChanged(int taskId, int stage, boolean visible) {
-                for (int i = 0; i < mExecutors.size(); i++) {
-                    final int index = i;
-                    mExecutors.valueAt(index).execute(() -> {
-                        mExecutors.keyAt(index).onTaskStageChanged(taskId, stage, visible);
-                    });
-                }
-            }
-
-            @Override
-            public void onSplitVisibilityChanged(boolean visible) {
-                for (int i = 0; i < mExecutors.size(); i++) {
-                    final int index = i;
-                    mExecutors.valueAt(index).execute(() -> {
-                        mExecutors.keyAt(index).onSplitVisibilityChanged(visible);
-                    });
-                }
-            }
-        };
-
-        @Override
-        public ISplitScreen createExternalInterface() {
-            if (mISplitScreen != null) {
-                mISplitScreen.invalidate();
-            }
-            mISplitScreen = new ISplitScreenImpl(SplitScreenController.this);
-            return mISplitScreen;
-        }
-
-        @Override
-        public void onKeyguardOccludedChanged(boolean occluded) {
-            mMainExecutor.execute(() -> {
-                SplitScreenController.this.onKeyguardOccludedChanged(occluded);
-            });
-        }
-
-        @Override
-        public void registerSplitScreenListener(SplitScreenListener listener, Executor executor) {
-            if (mExecutors.containsKey(listener)) return;
-
-            mMainExecutor.execute(() -> {
-                if (mExecutors.size() == 0) {
-                    SplitScreenController.this.registerSplitScreenListener(mListener);
-                }
-
-                mExecutors.put(listener, executor);
-            });
-
-            executor.execute(() -> {
-                mStageCoordinator.sendStatusToListener(listener);
-            });
-        }
-
-        @Override
-        public void unregisterSplitScreenListener(SplitScreenListener listener) {
-            mMainExecutor.execute(() -> {
-                mExecutors.remove(listener);
-
-                if (mExecutors.size() == 0) {
-                    SplitScreenController.this.unregisterSplitScreenListener(mListener);
-                }
-            });
-        }
-
-        @Override
-        public void onKeyguardVisibilityChanged(boolean showing) {
-            mMainExecutor.execute(() -> {
-                SplitScreenController.this.onKeyguardVisibilityChanged(showing);
-            });
-        }
-    }
-
-    /**
-     * The interface for calls from outside the host process.
-     */
-    @BinderThread
-    private static class ISplitScreenImpl extends ISplitScreen.Stub {
-        private SplitScreenController mController;
-        private ISplitScreenListener mListener;
-        private final SplitScreen.SplitScreenListener mSplitScreenListener =
-                new SplitScreen.SplitScreenListener() {
-                    @Override
-                    public void onStagePositionChanged(int stage, int position) {
-                        try {
-                            if (mListener != null) {
-                                mListener.onStagePositionChanged(stage, position);
-                            }
-                        } catch (RemoteException e) {
-                            Slog.e(TAG, "onStagePositionChanged", e);
-                        }
-                    }
-
-                    @Override
-                    public void onTaskStageChanged(int taskId, int stage, boolean visible) {
-                        try {
-                            if (mListener != null) {
-                                mListener.onTaskStageChanged(taskId, stage, visible);
-                            }
-                        } catch (RemoteException e) {
-                            Slog.e(TAG, "onTaskStageChanged", e);
-                        }
-                    }
-                };
-        private final IBinder.DeathRecipient mListenerDeathRecipient =
-                new IBinder.DeathRecipient() {
-                    @Override
-                    @BinderThread
-                    public void binderDied() {
-                        final SplitScreenController controller = mController;
-                        controller.getRemoteCallExecutor().execute(() -> {
-                            mListener = null;
-                            controller.unregisterSplitScreenListener(mSplitScreenListener);
-                        });
-                    }
-                };
-
-        public ISplitScreenImpl(SplitScreenController controller) {
-            mController = controller;
-        }
-
-        /**
-         * Invalidates this instance, preventing future calls from updating the controller.
-         */
-        void invalidate() {
-            mController = null;
-        }
-
-        @Override
-        public void registerSplitScreenListener(ISplitScreenListener listener) {
-            executeRemoteCallWithTaskPermission(mController, "registerSplitScreenListener",
-                    (controller) -> {
-                        if (mListener != null) {
-                            mListener.asBinder().unlinkToDeath(mListenerDeathRecipient,
-                                    0 /* flags */);
-                        }
-                        if (listener != null) {
-                            try {
-                                listener.asBinder().linkToDeath(mListenerDeathRecipient,
-                                        0 /* flags */);
-                            } catch (RemoteException e) {
-                                Slog.e(TAG, "Failed to link to death");
-                                return;
-                            }
-                        }
-                        mListener = listener;
-                        controller.registerSplitScreenListener(mSplitScreenListener);
-                    });
-        }
-
-        @Override
-        public void unregisterSplitScreenListener(ISplitScreenListener listener) {
-            executeRemoteCallWithTaskPermission(mController, "unregisterSplitScreenListener",
-                    (controller) -> {
-                        if (mListener != null) {
-                            mListener.asBinder().unlinkToDeath(mListenerDeathRecipient,
-                                    0 /* flags */);
-                        }
-                        mListener = null;
-                        controller.unregisterSplitScreenListener(mSplitScreenListener);
-                    });
-        }
-
-        @Override
-        public void exitSplitScreen(int toTopTaskId) {
-            executeRemoteCallWithTaskPermission(mController, "exitSplitScreen",
-                    (controller) -> {
-                        controller.exitSplitScreen(toTopTaskId,
-                                FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__UNKNOWN_EXIT);
-                    });
-        }
-
-        @Override
-        public void exitSplitScreenOnHide(boolean exitSplitScreenOnHide) {
-            executeRemoteCallWithTaskPermission(mController, "exitSplitScreenOnHide",
-                    (controller) -> {
-                        controller.exitSplitScreenOnHide(exitSplitScreenOnHide);
-                    });
-        }
-
-        @Override
-        public void setSideStageVisibility(boolean visible) {
-            executeRemoteCallWithTaskPermission(mController, "setSideStageVisibility",
-                    (controller) -> {
-                        controller.setSideStageVisibility(visible);
-                    });
-        }
-
-        @Override
-        public void removeFromSideStage(int taskId) {
-            executeRemoteCallWithTaskPermission(mController, "removeFromSideStage",
-                    (controller) -> {
-                        controller.removeFromSideStage(taskId);
-                    });
-        }
-
-        @Override
-        public void startTask(int taskId, int stage, int position, @Nullable Bundle options) {
-            executeRemoteCallWithTaskPermission(mController, "startTask",
-                    (controller) -> {
-                        controller.startTask(taskId, position, options);
-                    });
-        }
-
-        @Override
-        public void startTasksWithLegacyTransition(int mainTaskId, @Nullable Bundle mainOptions,
-                int sideTaskId, @Nullable Bundle sideOptions, @SplitPosition int sidePosition,
-                RemoteAnimationAdapter adapter) {
-            executeRemoteCallWithTaskPermission(mController, "startTasks",
-                    (controller) -> controller.mStageCoordinator.startTasksWithLegacyTransition(
-                            mainTaskId, mainOptions, sideTaskId, sideOptions, sidePosition,
-                            adapter));
-        }
-
-        @Override
-        public void startTasks(int mainTaskId, @Nullable Bundle mainOptions,
-                int sideTaskId, @Nullable Bundle sideOptions,
-                @SplitPosition int sidePosition,
-                @Nullable RemoteTransition remoteTransition) {
-            executeRemoteCallWithTaskPermission(mController, "startTasks",
-                    (controller) -> controller.mStageCoordinator.startTasks(mainTaskId, mainOptions,
-                            sideTaskId, sideOptions, sidePosition, remoteTransition));
-        }
-
-        @Override
-        public void startShortcut(String packageName, String shortcutId, int stage, int position,
-                @Nullable Bundle options, UserHandle user) {
-            executeRemoteCallWithTaskPermission(mController, "startShortcut",
-                    (controller) -> {
-                        controller.startShortcut(packageName, shortcutId, position,
-                                options, user);
-                    });
-        }
-
-        @Override
-        public void startIntent(PendingIntent intent, Intent fillInIntent, int stage, int position,
-                @Nullable Bundle options) {
-            executeRemoteCallWithTaskPermission(mController, "startIntent",
-                    (controller) -> {
-                        controller.startIntent(intent, fillInIntent, position, options);
-                    });
-        }
-
-        @Override
-        public RemoteAnimationTarget[] onGoingToRecentsLegacy(boolean cancel,
-                RemoteAnimationTarget[] apps) {
-            final RemoteAnimationTarget[][] out = new RemoteAnimationTarget[][]{null};
-            executeRemoteCallWithTaskPermission(mController, "onGoingToRecentsLegacy",
-                    (controller) -> out[0] = controller.onGoingToRecentsLegacy(cancel, apps),
-                    true /* blocking */);
-            return out[0];
-        }
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenTransitions.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenTransitions.java
deleted file mode 100644
index 0183654..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitScreenTransitions.java
+++ /dev/null
@@ -1,292 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import static android.view.WindowManager.TRANSIT_CHANGE;
-import static android.view.WindowManager.TRANSIT_CLOSE;
-import static android.view.WindowManager.TRANSIT_OPEN;
-import static android.view.WindowManager.TRANSIT_TO_BACK;
-import static android.view.WindowManager.TRANSIT_TO_FRONT;
-import static android.window.TransitionInfo.FLAG_FIRST_CUSTOM;
-
-import static com.android.wm.shell.transition.Transitions.TRANSIT_SPLIT_DISMISS_SNAP;
-import static com.android.wm.shell.transition.Transitions.isOpeningType;
-
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
-import android.animation.ValueAnimator;
-import android.annotation.NonNull;
-import android.annotation.Nullable;
-import android.graphics.Rect;
-import android.os.IBinder;
-import android.view.SurfaceControl;
-import android.view.WindowManager;
-import android.window.RemoteTransition;
-import android.window.TransitionInfo;
-import android.window.WindowContainerToken;
-import android.window.WindowContainerTransaction;
-
-import com.android.wm.shell.common.TransactionPool;
-import com.android.wm.shell.transition.OneShotRemoteHandler;
-import com.android.wm.shell.transition.Transitions;
-
-import java.util.ArrayList;
-
-/** Manages transition animations for split-screen. */
-class SplitScreenTransitions {
-    private static final String TAG = "SplitScreenTransitions";
-
-    /** Flag applied to a transition change to identify it as a divider bar for animation. */
-    public static final int FLAG_IS_DIVIDER_BAR = FLAG_FIRST_CUSTOM;
-
-    private final TransactionPool mTransactionPool;
-    private final Transitions mTransitions;
-    private final Runnable mOnFinish;
-
-    IBinder mPendingDismiss = null;
-    IBinder mPendingEnter = null;
-
-    private IBinder mAnimatingTransition = null;
-    private OneShotRemoteHandler mRemoteHandler = null;
-
-    private Transitions.TransitionFinishCallback mRemoteFinishCB = (wct, wctCB) -> {
-        if (wct != null || wctCB != null) {
-            throw new UnsupportedOperationException("finish transactions not supported yet.");
-        }
-        onFinish();
-    };
-
-    /** Keeps track of currently running animations */
-    private final ArrayList<Animator> mAnimations = new ArrayList<>();
-
-    private Transitions.TransitionFinishCallback mFinishCallback = null;
-    private SurfaceControl.Transaction mFinishTransaction;
-
-    SplitScreenTransitions(@NonNull TransactionPool pool, @NonNull Transitions transitions,
-            @NonNull Runnable onFinishCallback) {
-        mTransactionPool = pool;
-        mTransitions = transitions;
-        mOnFinish = onFinishCallback;
-    }
-
-    void playAnimation(@NonNull IBinder transition, @NonNull TransitionInfo info,
-            @NonNull SurfaceControl.Transaction startTransaction,
-            @NonNull SurfaceControl.Transaction finishTransaction,
-            @NonNull Transitions.TransitionFinishCallback finishCallback,
-            @NonNull WindowContainerToken mainRoot, @NonNull WindowContainerToken sideRoot) {
-        mFinishCallback = finishCallback;
-        mAnimatingTransition = transition;
-        if (mRemoteHandler != null) {
-            mRemoteHandler.startAnimation(transition, info, startTransaction, finishTransaction,
-                    mRemoteFinishCB);
-            mRemoteHandler = null;
-            return;
-        }
-        playInternalAnimation(transition, info, startTransaction, mainRoot, sideRoot);
-    }
-
-    private void playInternalAnimation(@NonNull IBinder transition, @NonNull TransitionInfo info,
-            @NonNull SurfaceControl.Transaction t, @NonNull WindowContainerToken mainRoot,
-            @NonNull WindowContainerToken sideRoot) {
-        mFinishTransaction = mTransactionPool.acquire();
-
-        // Play some place-holder fade animations
-        for (int i = info.getChanges().size() - 1; i >= 0; --i) {
-            final TransitionInfo.Change change = info.getChanges().get(i);
-            final SurfaceControl leash = change.getLeash();
-            final int mode = info.getChanges().get(i).getMode();
-
-            if (mode == TRANSIT_CHANGE) {
-                if (change.getParent() != null) {
-                    // This is probably reparented, so we want the parent to be immediately visible
-                    final TransitionInfo.Change parentChange = info.getChange(change.getParent());
-                    t.show(parentChange.getLeash());
-                    t.setAlpha(parentChange.getLeash(), 1.f);
-                    // and then animate this layer outside the parent (since, for example, this is
-                    // the home task animating from fullscreen to part-screen).
-                    t.reparent(leash, info.getRootLeash());
-                    t.setLayer(leash, info.getChanges().size() - i);
-                    // build the finish reparent/reposition
-                    mFinishTransaction.reparent(leash, parentChange.getLeash());
-                    mFinishTransaction.setPosition(leash,
-                            change.getEndRelOffset().x, change.getEndRelOffset().y);
-                }
-                // TODO(shell-transitions): screenshot here
-                final Rect startBounds = new Rect(change.getStartAbsBounds());
-                final Rect endBounds = new Rect(change.getEndAbsBounds());
-                startBounds.offset(-info.getRootOffset().x, -info.getRootOffset().y);
-                endBounds.offset(-info.getRootOffset().x, -info.getRootOffset().y);
-                startExampleResizeAnimation(leash, startBounds, endBounds);
-            }
-            if (change.getParent() != null) {
-                continue;
-            }
-
-            if (transition == mPendingEnter && (mainRoot.equals(change.getContainer())
-                    || sideRoot.equals(change.getContainer()))) {
-                t.setWindowCrop(leash, change.getStartAbsBounds().width(),
-                        change.getStartAbsBounds().height());
-            }
-            boolean isOpening = isOpeningType(info.getType());
-            if (isOpening && (mode == TRANSIT_OPEN || mode == TRANSIT_TO_FRONT)) {
-                // fade in
-                startExampleAnimation(leash, true /* show */);
-            } else if (!isOpening && (mode == TRANSIT_CLOSE || mode == TRANSIT_TO_BACK)) {
-                // fade out
-                if (info.getType() == TRANSIT_SPLIT_DISMISS_SNAP) {
-                    // Dismissing via snap-to-top/bottom means that the dismissed task is already
-                    // not-visible (usually cropped to oblivion) so immediately set its alpha to 0
-                    // and don't animate it so it doesn't pop-in when reparented.
-                    t.setAlpha(leash, 0.f);
-                } else {
-                    startExampleAnimation(leash, false /* show */);
-                }
-            }
-        }
-        t.apply();
-        onFinish();
-    }
-
-    /** Starts a transition to enter split with a remote transition animator. */
-    IBinder startEnterTransition(@WindowManager.TransitionType int transitType,
-            @NonNull WindowContainerTransaction wct, @Nullable RemoteTransition remoteTransition,
-            @NonNull Transitions.TransitionHandler handler) {
-        if (remoteTransition != null) {
-            // Wrapping it for ease-of-use (OneShot handles all the binder linking/death stuff)
-            mRemoteHandler = new OneShotRemoteHandler(
-                    mTransitions.getMainExecutor(), remoteTransition);
-        }
-        final IBinder transition = mTransitions.startTransition(transitType, wct, handler);
-        mPendingEnter = transition;
-        if (mRemoteHandler != null) {
-            mRemoteHandler.setTransition(transition);
-        }
-        return transition;
-    }
-
-    /** Starts a transition for dismissing split after dragging the divider to a screen edge */
-    IBinder startSnapToDismiss(@NonNull WindowContainerTransaction wct,
-            @NonNull Transitions.TransitionHandler handler) {
-        final IBinder transition = mTransitions.startTransition(
-                TRANSIT_SPLIT_DISMISS_SNAP, wct, handler);
-        mPendingDismiss = transition;
-        return transition;
-    }
-
-    void onFinish() {
-        if (!mAnimations.isEmpty()) return;
-        mOnFinish.run();
-        if (mFinishTransaction != null) {
-            mFinishTransaction.apply();
-            mTransactionPool.release(mFinishTransaction);
-            mFinishTransaction = null;
-        }
-        mFinishCallback.onTransitionFinished(null /* wct */, null /* wctCB */);
-        mFinishCallback = null;
-        if (mAnimatingTransition == mPendingEnter) {
-            mPendingEnter = null;
-        }
-        if (mAnimatingTransition == mPendingDismiss) {
-            mPendingDismiss = null;
-        }
-        mAnimatingTransition = null;
-    }
-
-    // TODO(shell-transitions): real animations
-    private void startExampleAnimation(@NonNull SurfaceControl leash, boolean show) {
-        final float end = show ? 1.f : 0.f;
-        final float start = 1.f - end;
-        final SurfaceControl.Transaction transaction = mTransactionPool.acquire();
-        final ValueAnimator va = ValueAnimator.ofFloat(start, end);
-        va.setDuration(500);
-        va.addUpdateListener(animation -> {
-            float fraction = animation.getAnimatedFraction();
-            transaction.setAlpha(leash, start * (1.f - fraction) + end * fraction);
-            transaction.apply();
-        });
-        final Runnable finisher = () -> {
-            transaction.setAlpha(leash, end);
-            transaction.apply();
-            mTransactionPool.release(transaction);
-            mTransitions.getMainExecutor().execute(() -> {
-                mAnimations.remove(va);
-                onFinish();
-            });
-        };
-        va.addListener(new Animator.AnimatorListener() {
-            @Override
-            public void onAnimationStart(Animator animation) { }
-
-            @Override
-            public void onAnimationEnd(Animator animation) {
-                finisher.run();
-            }
-
-            @Override
-            public void onAnimationCancel(Animator animation) {
-                finisher.run();
-            }
-
-            @Override
-            public void onAnimationRepeat(Animator animation) { }
-        });
-        mAnimations.add(va);
-        mTransitions.getAnimExecutor().execute(va::start);
-    }
-
-    // TODO(shell-transitions): real animations
-    private void startExampleResizeAnimation(@NonNull SurfaceControl leash,
-            @NonNull Rect startBounds, @NonNull Rect endBounds) {
-        final SurfaceControl.Transaction transaction = mTransactionPool.acquire();
-        final ValueAnimator va = ValueAnimator.ofFloat(0.f, 1.f);
-        va.setDuration(500);
-        va.addUpdateListener(animation -> {
-            float fraction = animation.getAnimatedFraction();
-            transaction.setWindowCrop(leash,
-                    (int) (startBounds.width() * (1.f - fraction) + endBounds.width() * fraction),
-                    (int) (startBounds.height() * (1.f - fraction)
-                            + endBounds.height() * fraction));
-            transaction.setPosition(leash,
-                    startBounds.left * (1.f - fraction) + endBounds.left * fraction,
-                    startBounds.top * (1.f - fraction) + endBounds.top * fraction);
-            transaction.apply();
-        });
-        final Runnable finisher = () -> {
-            transaction.setWindowCrop(leash, 0, 0);
-            transaction.setPosition(leash, endBounds.left, endBounds.top);
-            transaction.apply();
-            mTransactionPool.release(transaction);
-            mTransitions.getMainExecutor().execute(() -> {
-                mAnimations.remove(va);
-                onFinish();
-            });
-        };
-        va.addListener(new AnimatorListenerAdapter() {
-            @Override
-            public void onAnimationEnd(Animator animation) {
-                finisher.run();
-            }
-
-            @Override
-            public void onAnimationCancel(Animator animation) {
-                finisher.run();
-            }
-        });
-        mAnimations.add(va);
-        mTransitions.getAnimExecutor().execute(va::start);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitscreenEventLogger.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitscreenEventLogger.java
deleted file mode 100644
index e185039..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/SplitscreenEventLogger.java
+++ /dev/null
@@ -1,324 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__ENTER_REASON__OVERVIEW;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_UNDEFINED;
-
-import com.android.internal.logging.InstanceId;
-import com.android.internal.logging.InstanceIdSequence;
-import com.android.internal.util.FrameworkStatsLog;
-import com.android.wm.shell.common.split.SplitScreenConstants.SplitPosition;
-
-/**
- * Helper class that to log Drag & Drop UIEvents for a single session, see also go/uievent
- */
-public class SplitscreenEventLogger {
-
-    // Used to generate instance ids for this drag if one is not provided
-    private final InstanceIdSequence mIdSequence;
-
-    // The instance id for the current splitscreen session (from start to end)
-    private InstanceId mLoggerSessionId;
-
-    // Drag info
-    private @SplitPosition int mDragEnterPosition;
-    private InstanceId mDragEnterSessionId;
-
-    // For deduping async events
-    private int mLastMainStagePosition = -1;
-    private int mLastMainStageUid = -1;
-    private int mLastSideStagePosition = -1;
-    private int mLastSideStageUid = -1;
-    private float mLastSplitRatio = -1f;
-
-    public SplitscreenEventLogger() {
-        mIdSequence = new InstanceIdSequence(Integer.MAX_VALUE);
-    }
-
-    /**
-     * Return whether a splitscreen session has started.
-     */
-    public boolean hasStartedSession() {
-        return mLoggerSessionId != null;
-    }
-
-    /**
-     * May be called before logEnter() to indicate that the session was started from a drag.
-     */
-    public void enterRequestedByDrag(@SplitPosition int position, InstanceId dragSessionId) {
-        mDragEnterPosition = position;
-        mDragEnterSessionId = dragSessionId;
-    }
-
-    /**
-     * Logs when the user enters splitscreen.
-     */
-    public void logEnter(float splitRatio,
-            @SplitPosition int mainStagePosition, int mainStageUid,
-            @SplitPosition int sideStagePosition, int sideStageUid,
-            boolean isLandscape) {
-        mLoggerSessionId = mIdSequence.newInstanceId();
-        int enterReason = mDragEnterPosition != SPLIT_POSITION_UNDEFINED
-                ? getDragEnterReasonFromSplitPosition(mDragEnterPosition, isLandscape)
-                : SPLITSCREEN_UICHANGED__ENTER_REASON__OVERVIEW;
-        updateMainStageState(getMainStagePositionFromSplitPosition(mainStagePosition, isLandscape),
-                mainStageUid);
-        updateSideStageState(getSideStagePositionFromSplitPosition(sideStagePosition, isLandscape),
-                sideStageUid);
-        updateSplitRatioState(splitRatio);
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__ENTER,
-                enterReason,
-                0 /* exitReason */,
-                splitRatio,
-                mLastMainStagePosition,
-                mLastMainStageUid,
-                mLastSideStagePosition,
-                mLastSideStageUid,
-                mDragEnterSessionId != null ? mDragEnterSessionId.getId() : 0,
-                mLoggerSessionId.getId());
-    }
-
-    /**
-     * Logs when the user exits splitscreen.  Only one of the main or side stages should be
-     * specified to indicate which position was focused as a part of exiting (both can be unset).
-     */
-    public void logExit(int exitReason, @SplitPosition int mainStagePosition, int mainStageUid,
-            @SplitPosition int sideStagePosition, int sideStageUid, boolean isLandscape) {
-        if (mLoggerSessionId == null) {
-            // Ignore changes until we've started logging the session
-            return;
-        }
-        if ((mainStagePosition != SPLIT_POSITION_UNDEFINED
-                && sideStagePosition != SPLIT_POSITION_UNDEFINED)
-                        || (mainStageUid != 0 && sideStageUid != 0)) {
-            throw new IllegalArgumentException("Only main or side stage should be set");
-        }
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__EXIT,
-                0 /* enterReason */,
-                exitReason,
-                0f /* splitRatio */,
-                getMainStagePositionFromSplitPosition(mainStagePosition, isLandscape),
-                mainStageUid,
-                getSideStagePositionFromSplitPosition(sideStagePosition, isLandscape),
-                sideStageUid,
-                0 /* dragInstanceId */,
-                mLoggerSessionId.getId());
-
-        // Reset states
-        mLoggerSessionId = null;
-        mDragEnterPosition = SPLIT_POSITION_UNDEFINED;
-        mDragEnterSessionId = null;
-        mLastMainStagePosition = -1;
-        mLastMainStageUid = -1;
-        mLastSideStagePosition = -1;
-        mLastSideStageUid = -1;
-    }
-
-    /**
-     * Logs when an app in the main stage changes.
-     */
-    public void logMainStageAppChange(@SplitPosition int mainStagePosition, int mainStageUid,
-            boolean isLandscape) {
-        if (mLoggerSessionId == null) {
-            // Ignore changes until we've started logging the session
-            return;
-        }
-        if (!updateMainStageState(getMainStagePositionFromSplitPosition(mainStagePosition,
-                isLandscape), mainStageUid)) {
-            // Ignore if there are no user perceived changes
-            return;
-        }
-
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__APP_CHANGE,
-                0 /* enterReason */,
-                0 /* exitReason */,
-                0f /* splitRatio */,
-                mLastMainStagePosition,
-                mLastMainStageUid,
-                0 /* sideStagePosition */,
-                0 /* sideStageUid */,
-                0 /* dragInstanceId */,
-                mLoggerSessionId.getId());
-    }
-
-    /**
-     * Logs when an app in the side stage changes.
-     */
-    public void logSideStageAppChange(@SplitPosition int sideStagePosition, int sideStageUid,
-            boolean isLandscape) {
-        if (mLoggerSessionId == null) {
-            // Ignore changes until we've started logging the session
-            return;
-        }
-        if (!updateSideStageState(getSideStagePositionFromSplitPosition(sideStagePosition,
-                isLandscape), sideStageUid)) {
-            // Ignore if there are no user perceived changes
-            return;
-        }
-
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__APP_CHANGE,
-                0 /* enterReason */,
-                0 /* exitReason */,
-                0f /* splitRatio */,
-                0 /* mainStagePosition */,
-                0 /* mainStageUid */,
-                mLastSideStagePosition,
-                mLastSideStageUid,
-                0 /* dragInstanceId */,
-                mLoggerSessionId.getId());
-    }
-
-    /**
-     * Logs when the splitscreen ratio changes.
-     */
-    public void logResize(float splitRatio) {
-        if (mLoggerSessionId == null) {
-            // Ignore changes until we've started logging the session
-            return;
-        }
-        if (splitRatio <= 0f || splitRatio >= 1f) {
-            // Don't bother reporting resizes that end up dismissing the split, that will be logged
-            // via the exit event
-            return;
-        }
-        if (!updateSplitRatioState(splitRatio)) {
-            // Ignore if there are no user perceived changes
-            return;
-        }
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__RESIZE,
-                0 /* enterReason */,
-                0 /* exitReason */,
-                mLastSplitRatio,
-                0 /* mainStagePosition */, 0 /* mainStageUid */,
-                0 /* sideStagePosition */, 0 /* sideStageUid */,
-                0 /* dragInstanceId */,
-                mLoggerSessionId.getId());
-    }
-
-    /**
-     * Logs when the apps in splitscreen are swapped.
-     */
-    public void logSwap(@SplitPosition int mainStagePosition, int mainStageUid,
-            @SplitPosition int sideStagePosition, int sideStageUid, boolean isLandscape) {
-        if (mLoggerSessionId == null) {
-            // Ignore changes until we've started logging the session
-            return;
-        }
-
-        updateMainStageState(getMainStagePositionFromSplitPosition(mainStagePosition, isLandscape),
-                mainStageUid);
-        updateSideStageState(getSideStagePositionFromSplitPosition(sideStagePosition, isLandscape),
-                sideStageUid);
-        FrameworkStatsLog.write(FrameworkStatsLog.SPLITSCREEN_UI_CHANGED,
-                FrameworkStatsLog.SPLITSCREEN_UICHANGED__ACTION__SWAP,
-                0 /* enterReason */,
-                0 /* exitReason */,
-                0f /* splitRatio */,
-                mLastMainStagePosition,
-                mLastMainStageUid,
-                mLastSideStagePosition,
-                mLastSideStageUid,
-                0 /* dragInstanceId */,
-                mLoggerSessionId.getId());
-    }
-
-    private boolean updateMainStageState(int mainStagePosition, int mainStageUid) {
-        boolean changed = (mLastMainStagePosition != mainStagePosition)
-                || (mLastMainStageUid != mainStageUid);
-        if (!changed) {
-            return false;
-        }
-
-        mLastMainStagePosition = mainStagePosition;
-        mLastMainStageUid = mainStageUid;
-        return true;
-    }
-
-    private boolean updateSideStageState(int sideStagePosition, int sideStageUid) {
-        boolean changed = (mLastSideStagePosition != sideStagePosition)
-                || (mLastSideStageUid != sideStageUid);
-        if (!changed) {
-            return false;
-        }
-
-        mLastSideStagePosition = sideStagePosition;
-        mLastSideStageUid = sideStageUid;
-        return true;
-    }
-
-    private boolean updateSplitRatioState(float splitRatio) {
-        boolean changed = Float.compare(mLastSplitRatio, splitRatio) != 0;
-        if (!changed) {
-            return false;
-        }
-
-        mLastSplitRatio = splitRatio;
-        return true;
-    }
-
-    public int getDragEnterReasonFromSplitPosition(@SplitPosition int position,
-            boolean isLandscape) {
-        if (isLandscape) {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__ENTER_REASON__DRAG_LEFT
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__ENTER_REASON__DRAG_RIGHT;
-        } else {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__ENTER_REASON__DRAG_TOP
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__ENTER_REASON__DRAG_BOTTOM;
-        }
-    }
-
-    private int getMainStagePositionFromSplitPosition(@SplitPosition int position,
-            boolean isLandscape) {
-        if (position == SPLIT_POSITION_UNDEFINED) {
-            return 0;
-        }
-        if (isLandscape) {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__MAIN_STAGE_POSITION__LEFT
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__MAIN_STAGE_POSITION__RIGHT;
-        } else {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__MAIN_STAGE_POSITION__TOP
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__MAIN_STAGE_POSITION__BOTTOM;
-        }
-    }
-
-    private int getSideStagePositionFromSplitPosition(@SplitPosition int position,
-            boolean isLandscape) {
-        if (position == SPLIT_POSITION_UNDEFINED) {
-            return 0;
-        }
-        if (isLandscape) {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__SIDE_STAGE_POSITION__LEFT
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__SIDE_STAGE_POSITION__RIGHT;
-        } else {
-            return position == SPLIT_POSITION_TOP_OR_LEFT
-                    ? FrameworkStatsLog.SPLITSCREEN_UICHANGED__SIDE_STAGE_POSITION__TOP
-                    : FrameworkStatsLog.SPLITSCREEN_UICHANGED__SIDE_STAGE_POSITION__BOTTOM;
-        }
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java
deleted file mode 100644
index ac25c75..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageCoordinator.java
+++ /dev/null
@@ -1,1333 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import static android.app.ActivityOptions.KEY_LAUNCH_ROOT_TASK_TOKEN;
-import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
-import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
-import static android.view.WindowManager.TRANSIT_OPEN;
-import static android.view.WindowManager.TRANSIT_TO_BACK;
-import static android.view.WindowManager.TRANSIT_TO_FRONT;
-import static android.view.WindowManager.transitTypeToString;
-
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__APP_DOES_NOT_SUPPORT_MULTIWINDOW;
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__APP_FINISHED;
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__DEVICE_FOLDED;
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__DRAG_DIVIDER;
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__RETURN_HOME;
-import static com.android.internal.util.FrameworkStatsLog.SPLITSCREEN_UICHANGED__EXIT_REASON__SCREEN_LOCKED_SHOW_ON_TOP;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_BOTTOM_OR_RIGHT;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_TOP_OR_LEFT;
-import static com.android.wm.shell.common.split.SplitScreenConstants.SPLIT_POSITION_UNDEFINED;
-import static com.android.wm.shell.stagesplit.SplitScreen.STAGE_TYPE_MAIN;
-import static com.android.wm.shell.stagesplit.SplitScreen.STAGE_TYPE_SIDE;
-import static com.android.wm.shell.stagesplit.SplitScreen.STAGE_TYPE_UNDEFINED;
-import static com.android.wm.shell.stagesplit.SplitScreen.stageTypeToString;
-import static com.android.wm.shell.stagesplit.SplitScreenTransitions.FLAG_IS_DIVIDER_BAR;
-import static com.android.wm.shell.transition.Transitions.ENABLE_SHELL_TRANSITIONS;
-import static com.android.wm.shell.transition.Transitions.TRANSIT_SPLIT_DISMISS_SNAP;
-import static com.android.wm.shell.transition.Transitions.TRANSIT_SPLIT_SCREEN_OPEN_TO_SIDE;
-import static com.android.wm.shell.transition.Transitions.TRANSIT_SPLIT_SCREEN_PAIR_OPEN;
-import static com.android.wm.shell.transition.Transitions.isClosingType;
-import static com.android.wm.shell.transition.Transitions.isOpeningType;
-
-import android.annotation.NonNull;
-import android.annotation.Nullable;
-import android.app.ActivityManager;
-import android.app.ActivityOptions;
-import android.app.ActivityTaskManager;
-import android.app.PendingIntent;
-import android.app.WindowConfiguration;
-import android.content.Context;
-import android.content.Intent;
-import android.graphics.Rect;
-import android.hardware.devicestate.DeviceStateManager;
-import android.os.Bundle;
-import android.os.IBinder;
-import android.os.RemoteException;
-import android.util.Log;
-import android.util.Slog;
-import android.view.IRemoteAnimationFinishedCallback;
-import android.view.IRemoteAnimationRunner;
-import android.view.RemoteAnimationAdapter;
-import android.view.RemoteAnimationTarget;
-import android.view.SurfaceControl;
-import android.view.SurfaceSession;
-import android.view.WindowManager;
-import android.window.DisplayAreaInfo;
-import android.window.RemoteTransition;
-import android.window.TransitionInfo;
-import android.window.TransitionRequestInfo;
-import android.window.WindowContainerToken;
-import android.window.WindowContainerTransaction;
-
-import com.android.internal.R;
-import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.logging.InstanceId;
-import com.android.internal.protolog.common.ProtoLog;
-import com.android.wm.shell.RootTaskDisplayAreaOrganizer;
-import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.DisplayImeController;
-import com.android.wm.shell.common.DisplayInsetsController;
-import com.android.wm.shell.common.SyncTransactionQueue;
-import com.android.wm.shell.common.TransactionPool;
-import com.android.wm.shell.common.split.SplitLayout;
-import com.android.wm.shell.common.split.SplitScreenConstants.SplitPosition;
-import com.android.wm.shell.common.split.SplitWindowManager;
-import com.android.wm.shell.protolog.ShellProtoLogGroup;
-import com.android.wm.shell.transition.Transitions;
-
-import java.io.PrintWriter;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Optional;
-
-import javax.inject.Provider;
-
-/**
- * Coordinates the staging (visibility, sizing, ...) of the split-screen {@link MainStage} and
- * {@link SideStage} stages.
- * Some high-level rules:
- * - The {@link StageCoordinator} is only considered active if the {@link SideStage} contains at
- * least one child task.
- * - The {@link MainStage} should only have children if the coordinator is active.
- * - The {@link SplitLayout} divider is only visible if both the {@link MainStage}
- * and {@link SideStage} are visible.
- * - The {@link MainStage} configuration is fullscreen when the {@link SideStage} isn't visible.
- * This rules are mostly implemented in {@link #onStageVisibilityChanged(StageListenerImpl)} and
- * {@link #onStageHasChildrenChanged(StageListenerImpl).}
- */
-class StageCoordinator implements SplitLayout.SplitLayoutHandler,
-        RootTaskDisplayAreaOrganizer.RootTaskDisplayAreaListener, Transitions.TransitionHandler {
-
-    private static final String TAG = StageCoordinator.class.getSimpleName();
-
-    /** internal value for mDismissTop that represents no dismiss */
-    private static final int NO_DISMISS = -2;
-
-    private final SurfaceSession mSurfaceSession = new SurfaceSession();
-
-    private final MainStage mMainStage;
-    private final StageListenerImpl mMainStageListener = new StageListenerImpl();
-    private final StageTaskUnfoldController mMainUnfoldController;
-    private final SideStage mSideStage;
-    private final StageListenerImpl mSideStageListener = new StageListenerImpl();
-    private final StageTaskUnfoldController mSideUnfoldController;
-    @SplitPosition
-    private int mSideStagePosition = SPLIT_POSITION_BOTTOM_OR_RIGHT;
-
-    private final int mDisplayId;
-    private SplitLayout mSplitLayout;
-    private boolean mDividerVisible;
-    private final SyncTransactionQueue mSyncQueue;
-    private final RootTaskDisplayAreaOrganizer mRootTDAOrganizer;
-    private final ShellTaskOrganizer mTaskOrganizer;
-    private DisplayAreaInfo mDisplayAreaInfo;
-    private final Context mContext;
-    private final List<SplitScreen.SplitScreenListener> mListeners = new ArrayList<>();
-    private final DisplayImeController mDisplayImeController;
-    private final DisplayInsetsController mDisplayInsetsController;
-    private final SplitScreenTransitions mSplitTransitions;
-    private final SplitscreenEventLogger mLogger;
-    private boolean mExitSplitScreenOnHide;
-    private boolean mKeyguardOccluded;
-
-    // TODO(b/187041611): remove this flag after totally deprecated legacy split
-    /** Whether the device is supporting legacy split or not. */
-    private boolean mUseLegacySplit;
-
-    @SplitScreen.StageType private int mDismissTop = NO_DISMISS;
-
-    /** The target stage to dismiss to when unlock after folded. */
-    @SplitScreen.StageType private int mTopStageAfterFoldDismiss = STAGE_TYPE_UNDEFINED;
-
-    private final Runnable mOnTransitionAnimationComplete = () -> {
-        // If still playing, let it finish.
-        if (!isSplitScreenVisible()) {
-            // Update divider state after animation so that it is still around and positioned
-            // properly for the animation itself.
-            setDividerVisibility(false);
-            mSplitLayout.resetDividerPosition();
-        }
-        mDismissTop = NO_DISMISS;
-    };
-
-    private final SplitWindowManager.ParentContainerCallbacks mParentContainerCallbacks =
-            new SplitWindowManager.ParentContainerCallbacks() {
-        @Override
-        public void attachToParentSurface(SurfaceControl.Builder b) {
-            mRootTDAOrganizer.attachToDisplayArea(mDisplayId, b);
-        }
-
-        @Override
-        public void onLeashReady(SurfaceControl leash) {
-            mSyncQueue.runInSync(t -> applyDividerVisibility(t));
-        }
-    };
-
-    StageCoordinator(Context context, int displayId, SyncTransactionQueue syncQueue,
-            RootTaskDisplayAreaOrganizer rootTDAOrganizer, ShellTaskOrganizer taskOrganizer,
-            DisplayImeController displayImeController,
-            DisplayInsetsController displayInsetsController, Transitions transitions,
-            TransactionPool transactionPool, SplitscreenEventLogger logger,
-            Provider<Optional<StageTaskUnfoldController>> unfoldControllerProvider) {
-        mContext = context;
-        mDisplayId = displayId;
-        mSyncQueue = syncQueue;
-        mRootTDAOrganizer = rootTDAOrganizer;
-        mTaskOrganizer = taskOrganizer;
-        mLogger = logger;
-        mMainUnfoldController = unfoldControllerProvider.get().orElse(null);
-        mSideUnfoldController = unfoldControllerProvider.get().orElse(null);
-
-        mMainStage = new MainStage(
-                mTaskOrganizer,
-                mDisplayId,
-                mMainStageListener,
-                mSyncQueue,
-                mSurfaceSession,
-                mMainUnfoldController);
-        mSideStage = new SideStage(
-                mContext,
-                mTaskOrganizer,
-                mDisplayId,
-                mSideStageListener,
-                mSyncQueue,
-                mSurfaceSession,
-                mSideUnfoldController);
-        mDisplayImeController = displayImeController;
-        mDisplayInsetsController = displayInsetsController;
-        mDisplayInsetsController.addInsetsChangedListener(mDisplayId, mSideStage);
-        mRootTDAOrganizer.registerListener(displayId, this);
-        final DeviceStateManager deviceStateManager =
-                mContext.getSystemService(DeviceStateManager.class);
-        deviceStateManager.registerCallback(taskOrganizer.getExecutor(),
-                new DeviceStateManager.FoldStateListener(mContext, this::onFoldedStateChanged));
-        mSplitTransitions = new SplitScreenTransitions(transactionPool, transitions,
-                mOnTransitionAnimationComplete);
-        transitions.addHandler(this);
-    }
-
-    @VisibleForTesting
-    StageCoordinator(Context context, int displayId, SyncTransactionQueue syncQueue,
-            RootTaskDisplayAreaOrganizer rootTDAOrganizer, ShellTaskOrganizer taskOrganizer,
-            MainStage mainStage, SideStage sideStage, DisplayImeController displayImeController,
-            DisplayInsetsController displayInsetsController, SplitLayout splitLayout,
-            Transitions transitions, TransactionPool transactionPool,
-            SplitscreenEventLogger logger,
-            Provider<Optional<StageTaskUnfoldController>> unfoldControllerProvider) {
-        mContext = context;
-        mDisplayId = displayId;
-        mSyncQueue = syncQueue;
-        mRootTDAOrganizer = rootTDAOrganizer;
-        mTaskOrganizer = taskOrganizer;
-        mMainStage = mainStage;
-        mSideStage = sideStage;
-        mDisplayImeController = displayImeController;
-        mDisplayInsetsController = displayInsetsController;
-        mRootTDAOrganizer.registerListener(displayId, this);
-        mSplitLayout = splitLayout;
-        mSplitTransitions = new SplitScreenTransitions(transactionPool, transitions,
-                mOnTransitionAnimationComplete);
-        mMainUnfoldController = unfoldControllerProvider.get().orElse(null);
-        mSideUnfoldController = unfoldControllerProvider.get().orElse(null);
-        mLogger = logger;
-        transitions.addHandler(this);
-    }
-
-    @VisibleForTesting
-    SplitScreenTransitions getSplitTransitions() {
-        return mSplitTransitions;
-    }
-
-    boolean isSplitScreenVisible() {
-        return mSideStageListener.mVisible && mMainStageListener.mVisible;
-    }
-
-    boolean moveToSideStage(ActivityManager.RunningTaskInfo task,
-            @SplitPosition int sideStagePosition) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        setSideStagePosition(sideStagePosition, wct);
-        mMainStage.activate(getMainStageBounds(), wct);
-        mSideStage.addTask(task, getSideStageBounds(), wct);
-        mSyncQueue.queue(wct);
-        mSyncQueue.runInSync(
-                t -> updateSurfaceBounds(null /* layout */, t, false /* applyResizingOffset */));
-        return true;
-    }
-
-    boolean removeFromSideStage(int taskId) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-
-        /**
-         * {@link MainStage} will be deactivated in {@link #onStageHasChildrenChanged} if the
-         * {@link SideStage} no longer has children.
-         */
-        final boolean result = mSideStage.removeTask(taskId,
-                mMainStage.isActive() ? mMainStage.mRootTaskInfo.token : null,
-                wct);
-        mTaskOrganizer.applyTransaction(wct);
-        return result;
-    }
-
-    void setSideStageOutline(boolean enable) {
-        mSideStage.enableOutline(enable);
-    }
-
-    /** Starts 2 tasks in one transition. */
-    void startTasks(int mainTaskId, @Nullable Bundle mainOptions, int sideTaskId,
-            @Nullable Bundle sideOptions, @SplitPosition int sidePosition,
-            @Nullable RemoteTransition remoteTransition) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        mainOptions = mainOptions != null ? mainOptions : new Bundle();
-        sideOptions = sideOptions != null ? sideOptions : new Bundle();
-        setSideStagePosition(sidePosition, wct);
-
-        // Build a request WCT that will launch both apps such that task 0 is on the main stage
-        // while task 1 is on the side stage.
-        mMainStage.activate(getMainStageBounds(), wct);
-        mSideStage.setBounds(getSideStageBounds(), wct);
-
-        // Make sure the launch options will put tasks in the corresponding split roots
-        addActivityOptions(mainOptions, mMainStage);
-        addActivityOptions(sideOptions, mSideStage);
-
-        // Add task launch requests
-        wct.startTask(mainTaskId, mainOptions);
-        wct.startTask(sideTaskId, sideOptions);
-
-        mSplitTransitions.startEnterTransition(
-                TRANSIT_SPLIT_SCREEN_PAIR_OPEN, wct, remoteTransition, this);
-    }
-
-    /** Starts 2 tasks in one legacy transition. */
-    void startTasksWithLegacyTransition(int mainTaskId, @Nullable Bundle mainOptions,
-            int sideTaskId, @Nullable Bundle sideOptions, @SplitPosition int sidePosition,
-            RemoteAnimationAdapter adapter) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        // Need to add another wrapper here in shell so that we can inject the divider bar
-        // and also manage the process elevation via setRunningRemote
-        IRemoteAnimationRunner wrapper = new IRemoteAnimationRunner.Stub() {
-            @Override
-            public void onAnimationStart(@WindowManager.TransitionOldType int transit,
-                    RemoteAnimationTarget[] apps,
-                    RemoteAnimationTarget[] wallpapers,
-                    RemoteAnimationTarget[] nonApps,
-                    final IRemoteAnimationFinishedCallback finishedCallback) {
-                RemoteAnimationTarget[] augmentedNonApps =
-                        new RemoteAnimationTarget[nonApps.length + 1];
-                for (int i = 0; i < nonApps.length; ++i) {
-                    augmentedNonApps[i] = nonApps[i];
-                }
-                augmentedNonApps[augmentedNonApps.length - 1] = getDividerBarLegacyTarget();
-                try {
-                    ActivityTaskManager.getService().setRunningRemoteTransitionDelegate(
-                            adapter.getCallingApplication());
-                    adapter.getRunner().onAnimationStart(transit, apps, wallpapers, nonApps,
-                            finishedCallback);
-                } catch (RemoteException e) {
-                    Slog.e(TAG, "Error starting remote animation", e);
-                }
-            }
-
-            @Override
-            public void onAnimationCancelled() {
-                try {
-                    adapter.getRunner().onAnimationCancelled();
-                } catch (RemoteException e) {
-                    Slog.e(TAG, "Error starting remote animation", e);
-                }
-            }
-        };
-        RemoteAnimationAdapter wrappedAdapter = new RemoteAnimationAdapter(
-                wrapper, adapter.getDuration(), adapter.getStatusBarTransitionDelay());
-
-        if (mainOptions == null) {
-            mainOptions = ActivityOptions.makeRemoteAnimation(wrappedAdapter).toBundle();
-        } else {
-            ActivityOptions mainActivityOptions = ActivityOptions.fromBundle(mainOptions);
-            mainActivityOptions.update(ActivityOptions.makeRemoteAnimation(wrappedAdapter));
-        }
-
-        sideOptions = sideOptions != null ? sideOptions : new Bundle();
-        setSideStagePosition(sidePosition, wct);
-
-        // Build a request WCT that will launch both apps such that task 0 is on the main stage
-        // while task 1 is on the side stage.
-        mMainStage.activate(getMainStageBounds(), wct);
-        mSideStage.setBounds(getSideStageBounds(), wct);
-
-        // Make sure the launch options will put tasks in the corresponding split roots
-        addActivityOptions(mainOptions, mMainStage);
-        addActivityOptions(sideOptions, mSideStage);
-
-        // Add task launch requests
-        wct.startTask(mainTaskId, mainOptions);
-        wct.startTask(sideTaskId, sideOptions);
-
-        // Using legacy transitions, so we can't use blast sync since it conflicts.
-        mTaskOrganizer.applyTransaction(wct);
-    }
-
-    public void startIntent(PendingIntent intent, Intent fillInIntent,
-            @SplitScreen.StageType int stage, @SplitPosition int position,
-            @androidx.annotation.Nullable Bundle options,
-            @Nullable RemoteTransition remoteTransition) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        options = resolveStartStage(stage, position, options, wct);
-        wct.sendPendingIntent(intent, fillInIntent, options);
-        mSplitTransitions.startEnterTransition(
-                TRANSIT_SPLIT_SCREEN_OPEN_TO_SIDE, wct, remoteTransition, this);
-    }
-
-    Bundle resolveStartStage(@SplitScreen.StageType int stage,
-            @SplitPosition int position, @androidx.annotation.Nullable Bundle options,
-            @androidx.annotation.Nullable WindowContainerTransaction wct) {
-        switch (stage) {
-            case STAGE_TYPE_UNDEFINED: {
-                // Use the stage of the specified position is valid.
-                if (position != SPLIT_POSITION_UNDEFINED) {
-                    if (position == getSideStagePosition()) {
-                        options = resolveStartStage(STAGE_TYPE_SIDE, position, options, wct);
-                    } else {
-                        options = resolveStartStage(STAGE_TYPE_MAIN, position, options, wct);
-                    }
-                } else {
-                    // Exit split-screen and launch fullscreen since stage wasn't specified.
-                    prepareExitSplitScreen(STAGE_TYPE_UNDEFINED, wct);
-                }
-                break;
-            }
-            case STAGE_TYPE_SIDE: {
-                if (position != SPLIT_POSITION_UNDEFINED) {
-                    setSideStagePosition(position, wct);
-                } else {
-                    position = getSideStagePosition();
-                }
-                if (options == null) {
-                    options = new Bundle();
-                }
-                updateActivityOptions(options, position);
-                break;
-            }
-            case STAGE_TYPE_MAIN: {
-                if (position != SPLIT_POSITION_UNDEFINED) {
-                    // Set the side stage opposite of what we want to the main stage.
-                    final int sideStagePosition = position == SPLIT_POSITION_TOP_OR_LEFT
-                            ? SPLIT_POSITION_BOTTOM_OR_RIGHT : SPLIT_POSITION_TOP_OR_LEFT;
-                    setSideStagePosition(sideStagePosition, wct);
-                } else {
-                    position = getMainStagePosition();
-                }
-                if (options == null) {
-                    options = new Bundle();
-                }
-                updateActivityOptions(options, position);
-                break;
-            }
-            default:
-                throw new IllegalArgumentException("Unknown stage=" + stage);
-        }
-
-        return options;
-    }
-
-    @SplitPosition
-    int getSideStagePosition() {
-        return mSideStagePosition;
-    }
-
-    @SplitPosition
-    int getMainStagePosition() {
-        return mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT
-                ? SPLIT_POSITION_BOTTOM_OR_RIGHT : SPLIT_POSITION_TOP_OR_LEFT;
-    }
-
-    void setSideStagePosition(@SplitPosition int sideStagePosition,
-            @Nullable WindowContainerTransaction wct) {
-        setSideStagePosition(sideStagePosition, true /* updateBounds */, wct);
-    }
-
-    private void setSideStagePosition(@SplitPosition int sideStagePosition, boolean updateBounds,
-            @Nullable WindowContainerTransaction wct) {
-        if (mSideStagePosition == sideStagePosition) return;
-        mSideStagePosition = sideStagePosition;
-        sendOnStagePositionChanged();
-
-        if (mSideStageListener.mVisible && updateBounds) {
-            if (wct == null) {
-                // onLayoutSizeChanged builds/applies a wct with the contents of updateWindowBounds.
-                onLayoutSizeChanged(mSplitLayout);
-            } else {
-                updateWindowBounds(mSplitLayout, wct);
-                updateUnfoldBounds();
-            }
-        }
-    }
-
-    void setSideStageVisibility(boolean visible) {
-        if (mSideStageListener.mVisible == visible) return;
-
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        mSideStage.setVisibility(visible, wct);
-        mTaskOrganizer.applyTransaction(wct);
-    }
-
-    void onKeyguardOccludedChanged(boolean occluded) {
-        // Do not exit split directly, because it needs to wait for task info update to determine
-        // which task should remain on top after split dismissed.
-        mKeyguardOccluded = occluded;
-    }
-
-    void onKeyguardVisibilityChanged(boolean showing) {
-        if (!showing && mMainStage.isActive()
-                && mTopStageAfterFoldDismiss != STAGE_TYPE_UNDEFINED) {
-            exitSplitScreen(mTopStageAfterFoldDismiss == STAGE_TYPE_MAIN ? mMainStage : mSideStage,
-                    SPLITSCREEN_UICHANGED__EXIT_REASON__DEVICE_FOLDED);
-        }
-    }
-
-    void exitSplitScreenOnHide(boolean exitSplitScreenOnHide) {
-        mExitSplitScreenOnHide = exitSplitScreenOnHide;
-    }
-
-    void exitSplitScreen(int toTopTaskId, int exitReason) {
-        StageTaskListener childrenToTop = null;
-        if (mMainStage.containsTask(toTopTaskId)) {
-            childrenToTop = mMainStage;
-        } else if (mSideStage.containsTask(toTopTaskId)) {
-            childrenToTop = mSideStage;
-        }
-
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        if (childrenToTop != null) {
-            childrenToTop.reorderChild(toTopTaskId, true /* onTop */, wct);
-        }
-        applyExitSplitScreen(childrenToTop, wct, exitReason);
-    }
-
-    private void exitSplitScreen(StageTaskListener childrenToTop, int exitReason) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        applyExitSplitScreen(childrenToTop, wct, exitReason);
-    }
-
-    private void applyExitSplitScreen(
-            StageTaskListener childrenToTop,
-            WindowContainerTransaction wct, int exitReason) {
-        mSideStage.removeAllTasks(wct, childrenToTop == mSideStage);
-        mMainStage.deactivate(wct, childrenToTop == mMainStage);
-        mTaskOrganizer.applyTransaction(wct);
-        mSyncQueue.runInSync(t -> t
-                .setWindowCrop(mMainStage.mRootLeash, null)
-                .setWindowCrop(mSideStage.mRootLeash, null));
-        // Hide divider and reset its position.
-        setDividerVisibility(false);
-        mSplitLayout.resetDividerPosition();
-        mTopStageAfterFoldDismiss = STAGE_TYPE_UNDEFINED;
-        if (childrenToTop != null) {
-            logExitToStage(exitReason, childrenToTop == mMainStage);
-        } else {
-            logExit(exitReason);
-        }
-    }
-
-    /**
-     * Unlike exitSplitScreen, this takes a stagetype vs an actual stage-reference and populates
-     * an existing WindowContainerTransaction (rather than applying immediately). This is intended
-     * to be used when exiting split might be bundled with other window operations.
-     */
-    void prepareExitSplitScreen(@SplitScreen.StageType int stageToTop,
-            @NonNull WindowContainerTransaction wct) {
-        mSideStage.removeAllTasks(wct, stageToTop == STAGE_TYPE_SIDE);
-        mMainStage.deactivate(wct, stageToTop == STAGE_TYPE_MAIN);
-    }
-
-    void getStageBounds(Rect outTopOrLeftBounds, Rect outBottomOrRightBounds) {
-        outTopOrLeftBounds.set(mSplitLayout.getBounds1());
-        outBottomOrRightBounds.set(mSplitLayout.getBounds2());
-    }
-
-    private void addActivityOptions(Bundle opts, StageTaskListener stage) {
-        opts.putParcelable(KEY_LAUNCH_ROOT_TASK_TOKEN, stage.mRootTaskInfo.token);
-    }
-
-    void updateActivityOptions(Bundle opts, @SplitPosition int position) {
-        addActivityOptions(opts, position == mSideStagePosition ? mSideStage : mMainStage);
-    }
-
-    void registerSplitScreenListener(SplitScreen.SplitScreenListener listener) {
-        if (mListeners.contains(listener)) return;
-        mListeners.add(listener);
-        sendStatusToListener(listener);
-    }
-
-    void unregisterSplitScreenListener(SplitScreen.SplitScreenListener listener) {
-        mListeners.remove(listener);
-    }
-
-    void sendStatusToListener(SplitScreen.SplitScreenListener listener) {
-        listener.onStagePositionChanged(STAGE_TYPE_MAIN, getMainStagePosition());
-        listener.onStagePositionChanged(STAGE_TYPE_SIDE, getSideStagePosition());
-        listener.onSplitVisibilityChanged(isSplitScreenVisible());
-        mSideStage.onSplitScreenListenerRegistered(listener, STAGE_TYPE_SIDE);
-        mMainStage.onSplitScreenListenerRegistered(listener, STAGE_TYPE_MAIN);
-    }
-
-    private void sendOnStagePositionChanged() {
-        for (int i = mListeners.size() - 1; i >= 0; --i) {
-            final SplitScreen.SplitScreenListener l = mListeners.get(i);
-            l.onStagePositionChanged(STAGE_TYPE_MAIN, getMainStagePosition());
-            l.onStagePositionChanged(STAGE_TYPE_SIDE, getSideStagePosition());
-        }
-    }
-
-    private void onStageChildTaskStatusChanged(StageListenerImpl stageListener, int taskId,
-            boolean present, boolean visible) {
-        int stage;
-        if (present) {
-            stage = stageListener == mSideStageListener ? STAGE_TYPE_SIDE : STAGE_TYPE_MAIN;
-        } else {
-            // No longer on any stage
-            stage = STAGE_TYPE_UNDEFINED;
-        }
-        if (stage == STAGE_TYPE_MAIN) {
-            mLogger.logMainStageAppChange(getMainStagePosition(), mMainStage.getTopChildTaskUid(),
-                    mSplitLayout.isLandscape());
-        } else {
-            mLogger.logSideStageAppChange(getSideStagePosition(), mSideStage.getTopChildTaskUid(),
-                    mSplitLayout.isLandscape());
-        }
-
-        for (int i = mListeners.size() - 1; i >= 0; --i) {
-            mListeners.get(i).onTaskStageChanged(taskId, stage, visible);
-        }
-    }
-
-    private void sendSplitVisibilityChanged() {
-        for (int i = mListeners.size() - 1; i >= 0; --i) {
-            final SplitScreen.SplitScreenListener l = mListeners.get(i);
-            l.onSplitVisibilityChanged(mDividerVisible);
-        }
-
-        if (mMainUnfoldController != null && mSideUnfoldController != null) {
-            mMainUnfoldController.onSplitVisibilityChanged(mDividerVisible);
-            mSideUnfoldController.onSplitVisibilityChanged(mDividerVisible);
-        }
-    }
-
-    private void onStageRootTaskAppeared(StageListenerImpl stageListener) {
-        if (mMainStageListener.mHasRootTask && mSideStageListener.mHasRootTask) {
-            mUseLegacySplit = mContext.getResources().getBoolean(R.bool.config_useLegacySplit);
-            final WindowContainerTransaction wct = new WindowContainerTransaction();
-            // Make the stages adjacent to each other so they occlude what's behind them.
-            wct.setAdjacentRoots(mMainStage.mRootTaskInfo.token, mSideStage.mRootTaskInfo.token,
-                    true /* moveTogether */);
-
-            // Only sets side stage as launch-adjacent-flag-root when the device is not using legacy
-            // split to prevent new split behavior confusing users.
-            if (!mUseLegacySplit) {
-                wct.setLaunchAdjacentFlagRoot(mSideStage.mRootTaskInfo.token);
-            }
-
-            mTaskOrganizer.applyTransaction(wct);
-        }
-    }
-
-    private void onStageRootTaskVanished(StageListenerImpl stageListener) {
-        if (stageListener == mMainStageListener || stageListener == mSideStageListener) {
-            final WindowContainerTransaction wct = new WindowContainerTransaction();
-            // Deactivate the main stage if it no longer has a root task.
-            mMainStage.deactivate(wct);
-
-            if (!mUseLegacySplit) {
-                wct.clearLaunchAdjacentFlagRoot(mSideStage.mRootTaskInfo.token);
-            }
-
-            mTaskOrganizer.applyTransaction(wct);
-        }
-    }
-
-    private void setDividerVisibility(boolean visible) {
-        if (mDividerVisible == visible) return;
-        mDividerVisible = visible;
-        if (visible) {
-            mSplitLayout.init();
-            updateUnfoldBounds();
-        } else {
-            mSplitLayout.release();
-        }
-        sendSplitVisibilityChanged();
-    }
-
-    private void onStageVisibilityChanged(StageListenerImpl stageListener) {
-        final boolean sideStageVisible = mSideStageListener.mVisible;
-        final boolean mainStageVisible = mMainStageListener.mVisible;
-        final boolean bothStageVisible = sideStageVisible && mainStageVisible;
-        final boolean bothStageInvisible = !sideStageVisible && !mainStageVisible;
-        final boolean sameVisibility = sideStageVisible == mainStageVisible;
-        // Only add or remove divider when both visible or both invisible to avoid sometimes we only
-        // got one stage visibility changed for a moment and it will cause flicker.
-        if (sameVisibility) {
-            setDividerVisibility(bothStageVisible);
-        }
-
-        if (bothStageInvisible) {
-            if (mExitSplitScreenOnHide
-            // Don't dismiss staged split when both stages are not visible due to sleeping display,
-            // like the cases keyguard showing or screen off.
-            || (!mMainStage.mRootTaskInfo.isSleeping && !mSideStage.mRootTaskInfo.isSleeping)) {
-                exitSplitScreen(null /* childrenToTop */,
-                        SPLITSCREEN_UICHANGED__EXIT_REASON__RETURN_HOME);
-            }
-        } else if (mKeyguardOccluded) {
-            // At least one of the stages is visible while keyguard occluded. Dismiss split because
-            // there's show-when-locked activity showing on top of keyguard. Also make sure the
-            // task contains show-when-locked activity remains on top after split dismissed.
-            final StageTaskListener toTop =
-                    mainStageVisible ? mMainStage : (sideStageVisible ? mSideStage : null);
-            exitSplitScreen(toTop, SPLITSCREEN_UICHANGED__EXIT_REASON__SCREEN_LOCKED_SHOW_ON_TOP);
-        }
-
-        mSyncQueue.runInSync(t -> {
-            // Same above, we only set root tasks and divider leash visibility when both stage
-            // change to visible or invisible to avoid flicker.
-            if (sameVisibility) {
-                t.setVisibility(mSideStage.mRootLeash, bothStageVisible)
-                        .setVisibility(mMainStage.mRootLeash, bothStageVisible);
-                applyDividerVisibility(t);
-                applyOutlineVisibility(t);
-            }
-        });
-    }
-
-    private void applyDividerVisibility(SurfaceControl.Transaction t) {
-        final SurfaceControl dividerLeash = mSplitLayout.getDividerLeash();
-        if (dividerLeash == null) {
-            return;
-        }
-
-        if (mDividerVisible) {
-            t.show(dividerLeash)
-                    .setLayer(dividerLeash, Integer.MAX_VALUE)
-                    .setPosition(dividerLeash,
-                            mSplitLayout.getDividerBounds().left,
-                            mSplitLayout.getDividerBounds().top);
-        } else {
-            t.hide(dividerLeash);
-        }
-    }
-
-    private void applyOutlineVisibility(SurfaceControl.Transaction t) {
-        final SurfaceControl outlineLeash = mSideStage.getOutlineLeash();
-        if (outlineLeash == null) {
-            return;
-        }
-
-        if (mDividerVisible) {
-            t.show(outlineLeash).setLayer(outlineLeash, Integer.MAX_VALUE);
-        } else {
-            t.hide(outlineLeash);
-        }
-    }
-
-    private void onStageHasChildrenChanged(StageListenerImpl stageListener) {
-        final boolean hasChildren = stageListener.mHasChildren;
-        final boolean isSideStage = stageListener == mSideStageListener;
-        if (!hasChildren) {
-            if (isSideStage && mMainStageListener.mVisible) {
-                // Exit to main stage if side stage no longer has children.
-                exitSplitScreen(mMainStage, SPLITSCREEN_UICHANGED__EXIT_REASON__APP_FINISHED);
-            } else if (!isSideStage && mSideStageListener.mVisible) {
-                // Exit to side stage if main stage no longer has children.
-                exitSplitScreen(mSideStage, SPLITSCREEN_UICHANGED__EXIT_REASON__APP_FINISHED);
-            }
-        } else if (isSideStage) {
-            final WindowContainerTransaction wct = new WindowContainerTransaction();
-            // Make sure the main stage is active.
-            mMainStage.activate(getMainStageBounds(), wct);
-            mSideStage.setBounds(getSideStageBounds(), wct);
-            mTaskOrganizer.applyTransaction(wct);
-        }
-        if (!mLogger.hasStartedSession() && mMainStageListener.mHasChildren
-                && mSideStageListener.mHasChildren) {
-            mLogger.logEnter(mSplitLayout.getDividerPositionAsFraction(),
-                    getMainStagePosition(), mMainStage.getTopChildTaskUid(),
-                    getSideStagePosition(), mSideStage.getTopChildTaskUid(),
-                    mSplitLayout.isLandscape());
-        }
-    }
-
-    @VisibleForTesting
-    IBinder onSnappedToDismissTransition(boolean mainStageToTop) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        prepareExitSplitScreen(mainStageToTop ? STAGE_TYPE_MAIN : STAGE_TYPE_SIDE, wct);
-        return mSplitTransitions.startSnapToDismiss(wct, this);
-    }
-
-    @Override
-    public void onSnappedToDismiss(boolean bottomOrRight) {
-        final boolean mainStageToTop =
-                bottomOrRight ? mSideStagePosition == SPLIT_POSITION_BOTTOM_OR_RIGHT
-                        : mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT;
-        if (ENABLE_SHELL_TRANSITIONS) {
-            onSnappedToDismissTransition(mainStageToTop);
-            return;
-        }
-        exitSplitScreen(mainStageToTop ? mMainStage : mSideStage,
-                SPLITSCREEN_UICHANGED__EXIT_REASON__DRAG_DIVIDER);
-    }
-
-    @Override
-    public void onDoubleTappedDivider() {
-        setSideStagePosition(mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT
-                ? SPLIT_POSITION_BOTTOM_OR_RIGHT : SPLIT_POSITION_TOP_OR_LEFT, null /* wct */);
-        mLogger.logSwap(getMainStagePosition(), mMainStage.getTopChildTaskUid(),
-                getSideStagePosition(), mSideStage.getTopChildTaskUid(),
-                mSplitLayout.isLandscape());
-    }
-
-    @Override
-    public void onLayoutPositionChanging(SplitLayout layout) {
-        mSyncQueue.runInSync(t -> updateSurfaceBounds(layout, t, true /* applyResizingOffset */));
-    }
-
-    @Override
-    public void onLayoutSizeChanging(SplitLayout layout) {
-        mSyncQueue.runInSync(t -> updateSurfaceBounds(layout, t, true /* applyResizingOffset */));
-        mSideStage.setOutlineVisibility(false);
-    }
-
-    @Override
-    public void onLayoutSizeChanged(SplitLayout layout) {
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        updateWindowBounds(layout, wct);
-        updateUnfoldBounds();
-        mSyncQueue.queue(wct);
-        mSyncQueue.runInSync(t -> updateSurfaceBounds(layout, t, false /* applyResizingOffset */));
-        mSideStage.setOutlineVisibility(true);
-        mLogger.logResize(mSplitLayout.getDividerPositionAsFraction());
-    }
-
-    private void updateUnfoldBounds() {
-        if (mMainUnfoldController != null && mSideUnfoldController != null) {
-            mMainUnfoldController.onLayoutChanged(getMainStageBounds());
-            mSideUnfoldController.onLayoutChanged(getSideStageBounds());
-        }
-    }
-
-    /**
-     * Populates `wct` with operations that match the split windows to the current layout.
-     * To match relevant surfaces, make sure to call updateSurfaceBounds after `wct` is applied
-     */
-    private void updateWindowBounds(SplitLayout layout, WindowContainerTransaction wct) {
-        final StageTaskListener topLeftStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mSideStage : mMainStage;
-        final StageTaskListener bottomRightStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mMainStage : mSideStage;
-        layout.applyTaskChanges(wct, topLeftStage.mRootTaskInfo, bottomRightStage.mRootTaskInfo);
-    }
-
-    void updateSurfaceBounds(@Nullable SplitLayout layout, @NonNull SurfaceControl.Transaction t,
-            boolean applyResizingOffset) {
-        final StageTaskListener topLeftStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mSideStage : mMainStage;
-        final StageTaskListener bottomRightStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mMainStage : mSideStage;
-        (layout != null ? layout : mSplitLayout).applySurfaceChanges(t, topLeftStage.mRootLeash,
-                bottomRightStage.mRootLeash, topLeftStage.mDimLayer, bottomRightStage.mDimLayer,
-                applyResizingOffset);
-    }
-
-    @Override
-    public int getSplitItemPosition(WindowContainerToken token) {
-        if (token == null) {
-            return SPLIT_POSITION_UNDEFINED;
-        }
-
-        if (token.equals(mMainStage.mRootTaskInfo.getToken())) {
-            return getMainStagePosition();
-        } else if (token.equals(mSideStage.mRootTaskInfo.getToken())) {
-            return getSideStagePosition();
-        }
-
-        return SPLIT_POSITION_UNDEFINED;
-    }
-
-    @Override
-    public void setLayoutOffsetTarget(int offsetX, int offsetY, SplitLayout layout) {
-        final StageTaskListener topLeftStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mSideStage : mMainStage;
-        final StageTaskListener bottomRightStage =
-                mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT ? mMainStage : mSideStage;
-        final WindowContainerTransaction wct = new WindowContainerTransaction();
-        layout.applyLayoutOffsetTarget(wct, offsetX, offsetY, topLeftStage.mRootTaskInfo,
-                bottomRightStage.mRootTaskInfo);
-        mTaskOrganizer.applyTransaction(wct);
-    }
-
-    @Override
-    public void onDisplayAreaAppeared(DisplayAreaInfo displayAreaInfo) {
-        mDisplayAreaInfo = displayAreaInfo;
-        if (mSplitLayout == null) {
-            mSplitLayout = new SplitLayout(TAG + "SplitDivider", mContext,
-                    mDisplayAreaInfo.configuration, this, mParentContainerCallbacks,
-                    mDisplayImeController, mTaskOrganizer, SplitLayout.PARALLAX_DISMISSING);
-            mDisplayInsetsController.addInsetsChangedListener(mDisplayId, mSplitLayout);
-
-            if (mMainUnfoldController != null && mSideUnfoldController != null) {
-                mMainUnfoldController.init();
-                mSideUnfoldController.init();
-            }
-        }
-    }
-
-    @Override
-    public void onDisplayAreaVanished(DisplayAreaInfo displayAreaInfo) {
-        throw new IllegalStateException("Well that was unexpected...");
-    }
-
-    @Override
-    public void onDisplayAreaInfoChanged(DisplayAreaInfo displayAreaInfo) {
-        mDisplayAreaInfo = displayAreaInfo;
-        if (mSplitLayout != null
-                && mSplitLayout.updateConfiguration(mDisplayAreaInfo.configuration)
-                && mMainStage.isActive()) {
-            onLayoutSizeChanged(mSplitLayout);
-        }
-    }
-
-    private void onFoldedStateChanged(boolean folded) {
-        mTopStageAfterFoldDismiss = STAGE_TYPE_UNDEFINED;
-        if (!folded) return;
-
-        if (mMainStage.isFocused()) {
-            mTopStageAfterFoldDismiss = STAGE_TYPE_MAIN;
-        } else if (mSideStage.isFocused()) {
-            mTopStageAfterFoldDismiss = STAGE_TYPE_SIDE;
-        }
-    }
-
-    private Rect getSideStageBounds() {
-        return mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT
-                ? mSplitLayout.getBounds1() : mSplitLayout.getBounds2();
-    }
-
-    private Rect getMainStageBounds() {
-        return mSideStagePosition == SPLIT_POSITION_TOP_OR_LEFT
-                ? mSplitLayout.getBounds2() : mSplitLayout.getBounds1();
-    }
-
-    /**
-     * Get the stage that should contain this `taskInfo`. The stage doesn't necessarily contain
-     * this task (yet) so this can also be used to identify which stage to put a task into.
-     */
-    private StageTaskListener getStageOfTask(ActivityManager.RunningTaskInfo taskInfo) {
-        // TODO(b/184679596): Find a way to either include task-org information in the transition,
-        //                    or synchronize task-org callbacks so we can use stage.containsTask
-        if (mMainStage.mRootTaskInfo != null
-                && taskInfo.parentTaskId == mMainStage.mRootTaskInfo.taskId) {
-            return mMainStage;
-        } else if (mSideStage.mRootTaskInfo != null
-                && taskInfo.parentTaskId == mSideStage.mRootTaskInfo.taskId) {
-            return mSideStage;
-        }
-        return null;
-    }
-
-    @SplitScreen.StageType
-    private int getStageType(StageTaskListener stage) {
-        return stage == mMainStage ? STAGE_TYPE_MAIN : STAGE_TYPE_SIDE;
-    }
-
-    @Override
-    public WindowContainerTransaction handleRequest(@NonNull IBinder transition,
-            @Nullable TransitionRequestInfo request) {
-        final ActivityManager.RunningTaskInfo triggerTask = request.getTriggerTask();
-        if (triggerTask == null) {
-            // still want to monitor everything while in split-screen, so return non-null.
-            return isSplitScreenVisible() ? new WindowContainerTransaction() : null;
-        }
-
-        WindowContainerTransaction out = null;
-        final @WindowManager.TransitionType int type = request.getType();
-        if (isSplitScreenVisible()) {
-            // try to handle everything while in split-screen, so return a WCT even if it's empty.
-            ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "  split is active so using split"
-                            + "Transition to handle request. triggerTask=%d type=%s mainChildren=%d"
-                            + " sideChildren=%d", triggerTask.taskId, transitTypeToString(type),
-                    mMainStage.getChildCount(), mSideStage.getChildCount());
-            out = new WindowContainerTransaction();
-            final StageTaskListener stage = getStageOfTask(triggerTask);
-            if (stage != null) {
-                // dismiss split if the last task in one of the stages is going away
-                if (isClosingType(type) && stage.getChildCount() == 1) {
-                    // The top should be the opposite side that is closing:
-                    mDismissTop = getStageType(stage) == STAGE_TYPE_MAIN
-                            ? STAGE_TYPE_SIDE : STAGE_TYPE_MAIN;
-                }
-            } else {
-                if (triggerTask.getActivityType() == ACTIVITY_TYPE_HOME && isOpeningType(type)) {
-                    // Going home so dismiss both.
-                    mDismissTop = STAGE_TYPE_UNDEFINED;
-                }
-            }
-            if (mDismissTop != NO_DISMISS) {
-                ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "  splitTransition "
-                                + " deduced Dismiss from request. toTop=%s",
-                        stageTypeToString(mDismissTop));
-                prepareExitSplitScreen(mDismissTop, out);
-                mSplitTransitions.mPendingDismiss = transition;
-            }
-        } else {
-            // Not in split mode, so look for an open into a split stage just so we can whine and
-            // complain about how this isn't a supported operation.
-            if ((type == TRANSIT_OPEN || type == TRANSIT_TO_FRONT)) {
-                if (getStageOfTask(triggerTask) != null) {
-                    throw new IllegalStateException("Entering split implicitly with only one task"
-                            + " isn't supported.");
-                }
-            }
-        }
-        return out;
-    }
-
-    @Override
-    public boolean startAnimation(@NonNull IBinder transition,
-            @NonNull TransitionInfo info,
-            @NonNull SurfaceControl.Transaction startTransaction,
-            @NonNull SurfaceControl.Transaction finishTransaction,
-            @NonNull Transitions.TransitionFinishCallback finishCallback) {
-        if (transition != mSplitTransitions.mPendingDismiss
-                && transition != mSplitTransitions.mPendingEnter) {
-            // Not entering or exiting, so just do some house-keeping and validation.
-
-            // If we're not in split-mode, just abort so something else can handle it.
-            if (!isSplitScreenVisible()) return false;
-
-            for (int iC = 0; iC < info.getChanges().size(); ++iC) {
-                final TransitionInfo.Change change = info.getChanges().get(iC);
-                final ActivityManager.RunningTaskInfo taskInfo = change.getTaskInfo();
-                if (taskInfo == null || !taskInfo.hasParentTask()) continue;
-                final StageTaskListener stage = getStageOfTask(taskInfo);
-                if (stage == null) continue;
-                if (isOpeningType(change.getMode())) {
-                    if (!stage.containsTask(taskInfo.taskId)) {
-                        Log.w(TAG, "Expected onTaskAppeared on " + stage + " to have been called"
-                                + " with " + taskInfo.taskId + " before startAnimation().");
-                    }
-                } else if (isClosingType(change.getMode())) {
-                    if (stage.containsTask(taskInfo.taskId)) {
-                        Log.w(TAG, "Expected onTaskVanished on " + stage + " to have been called"
-                                + " with " + taskInfo.taskId + " before startAnimation().");
-                    }
-                }
-            }
-            if (mMainStage.getChildCount() == 0 || mSideStage.getChildCount() == 0) {
-                // TODO(shell-transitions): Implement a fallback behavior for now.
-                throw new IllegalStateException("Somehow removed the last task in a stage"
-                        + " outside of a proper transition");
-                // This can happen in some pathological cases. For example:
-                // 1. main has 2 tasks [Task A (Single-task), Task B], side has one task [Task C]
-                // 2. Task B closes itself and starts Task A in LAUNCH_ADJACENT at the same time
-                // In this case, the result *should* be that we leave split.
-                // TODO(b/184679596): Find a way to either include task-org information in
-                //                    the transition, or synchronize task-org callbacks.
-            }
-
-            // Use normal animations.
-            return false;
-        }
-
-        boolean shouldAnimate = true;
-        if (mSplitTransitions.mPendingEnter == transition) {
-            shouldAnimate = startPendingEnterAnimation(transition, info, startTransaction);
-        } else if (mSplitTransitions.mPendingDismiss == transition) {
-            shouldAnimate = startPendingDismissAnimation(transition, info, startTransaction);
-        }
-        if (!shouldAnimate) return false;
-
-        mSplitTransitions.playAnimation(transition, info, startTransaction, finishTransaction,
-                finishCallback, mMainStage.mRootTaskInfo.token, mSideStage.mRootTaskInfo.token);
-        return true;
-    }
-
-    private boolean startPendingEnterAnimation(@NonNull IBinder transition,
-            @NonNull TransitionInfo info, @NonNull SurfaceControl.Transaction t) {
-        if (info.getType() == TRANSIT_SPLIT_SCREEN_PAIR_OPEN) {
-            // First, verify that we actually have opened 2 apps in split.
-            TransitionInfo.Change mainChild = null;
-            TransitionInfo.Change sideChild = null;
-            for (int iC = 0; iC < info.getChanges().size(); ++iC) {
-                final TransitionInfo.Change change = info.getChanges().get(iC);
-                final ActivityManager.RunningTaskInfo taskInfo = change.getTaskInfo();
-                if (taskInfo == null || !taskInfo.hasParentTask()) continue;
-                final @SplitScreen.StageType int stageType = getStageType(getStageOfTask(taskInfo));
-                if (stageType == STAGE_TYPE_MAIN) {
-                    mainChild = change;
-                } else if (stageType == STAGE_TYPE_SIDE) {
-                    sideChild = change;
-                }
-            }
-            if (mainChild == null || sideChild == null) {
-                throw new IllegalStateException("Launched 2 tasks in split, but didn't receive"
-                        + " 2 tasks in transition. Possibly one of them failed to launch");
-                // TODO: fallback logic. Probably start a new transition to exit split before
-                //       applying anything here. Ideally consolidate with transition-merging.
-            }
-
-            // Update local states (before animating).
-            setDividerVisibility(true);
-            setSideStagePosition(SPLIT_POSITION_BOTTOM_OR_RIGHT, false /* updateBounds */,
-                    null /* wct */);
-            setSplitsVisible(true);
-
-            addDividerBarToTransition(info, t, true /* show */);
-
-            // Make some noise if things aren't totally expected. These states shouldn't effect
-            // transitions locally, but remotes (like Launcher) may get confused if they were
-            // depending on listener callbacks. This can happen because task-organizer callbacks
-            // aren't serialized with transition callbacks.
-            // TODO(b/184679596): Find a way to either include task-org information in
-            //                    the transition, or synchronize task-org callbacks.
-            if (!mMainStage.containsTask(mainChild.getTaskInfo().taskId)) {
-                Log.w(TAG, "Expected onTaskAppeared on " + mMainStage
-                        + " to have been called with " + mainChild.getTaskInfo().taskId
-                        + " before startAnimation().");
-            }
-            if (!mSideStage.containsTask(sideChild.getTaskInfo().taskId)) {
-                Log.w(TAG, "Expected onTaskAppeared on " + mSideStage
-                        + " to have been called with " + sideChild.getTaskInfo().taskId
-                        + " before startAnimation().");
-            }
-            return true;
-        } else {
-            // TODO: other entry method animations
-            throw new RuntimeException("Unsupported split-entry");
-        }
-    }
-
-    private boolean startPendingDismissAnimation(@NonNull IBinder transition,
-            @NonNull TransitionInfo info, @NonNull SurfaceControl.Transaction t) {
-        // Make some noise if things aren't totally expected. These states shouldn't effect
-        // transitions locally, but remotes (like Launcher) may get confused if they were
-        // depending on listener callbacks. This can happen because task-organizer callbacks
-        // aren't serialized with transition callbacks.
-        // TODO(b/184679596): Find a way to either include task-org information in
-        //                    the transition, or synchronize task-org callbacks.
-        if (mMainStage.getChildCount() != 0) {
-            final StringBuilder tasksLeft = new StringBuilder();
-            for (int i = 0; i < mMainStage.getChildCount(); ++i) {
-                tasksLeft.append(i != 0 ? ", " : "");
-                tasksLeft.append(mMainStage.mChildrenTaskInfo.keyAt(i));
-            }
-            Log.w(TAG, "Expected onTaskVanished on " + mMainStage
-                    + " to have been called with [" + tasksLeft.toString()
-                    + "] before startAnimation().");
-        }
-        if (mSideStage.getChildCount() != 0) {
-            final StringBuilder tasksLeft = new StringBuilder();
-            for (int i = 0; i < mSideStage.getChildCount(); ++i) {
-                tasksLeft.append(i != 0 ? ", " : "");
-                tasksLeft.append(mSideStage.mChildrenTaskInfo.keyAt(i));
-            }
-            Log.w(TAG, "Expected onTaskVanished on " + mSideStage
-                    + " to have been called with [" + tasksLeft.toString()
-                    + "] before startAnimation().");
-        }
-
-        // Update local states.
-        setSplitsVisible(false);
-        // Wait until after animation to update divider
-
-        if (info.getType() == TRANSIT_SPLIT_DISMISS_SNAP) {
-            // Reset crops so they don't interfere with subsequent launches
-            t.setWindowCrop(mMainStage.mRootLeash, null);
-            t.setWindowCrop(mSideStage.mRootLeash, null);
-        }
-
-        if (mDismissTop == STAGE_TYPE_UNDEFINED) {
-            // Going home (dismissing both splits)
-
-            // TODO: Have a proper remote for this. Until then, though, reset state and use the
-            //       normal animation stuff (which falls back to the normal launcher remote).
-            t.hide(mSplitLayout.getDividerLeash());
-            setDividerVisibility(false);
-            mSplitTransitions.mPendingDismiss = null;
-            return false;
-        }
-
-        addDividerBarToTransition(info, t, false /* show */);
-        // We're dismissing split by moving the other one to fullscreen.
-        // Since we don't have any animations for this yet, just use the internal example
-        // animations.
-        return true;
-    }
-
-    private void addDividerBarToTransition(@NonNull TransitionInfo info,
-            @NonNull SurfaceControl.Transaction t, boolean show) {
-        final SurfaceControl leash = mSplitLayout.getDividerLeash();
-        final TransitionInfo.Change barChange = new TransitionInfo.Change(null /* token */, leash);
-        final Rect bounds = mSplitLayout.getDividerBounds();
-        barChange.setStartAbsBounds(bounds);
-        barChange.setEndAbsBounds(bounds);
-        barChange.setMode(show ? TRANSIT_TO_FRONT : TRANSIT_TO_BACK);
-        barChange.setFlags(FLAG_IS_DIVIDER_BAR);
-        // Technically this should be order-0, but this is running after layer assignment
-        // and it's a special case, so just add to end.
-        info.addChange(barChange);
-        // Be default, make it visible. The remote animator can adjust alpha if it plans to animate.
-        if (show) {
-            t.setAlpha(leash, 1.f);
-            t.setLayer(leash, Integer.MAX_VALUE);
-            t.setPosition(leash, bounds.left, bounds.top);
-            t.show(leash);
-        }
-    }
-
-    RemoteAnimationTarget getDividerBarLegacyTarget() {
-        final Rect bounds = mSplitLayout.getDividerBounds();
-        return new RemoteAnimationTarget(-1 /* taskId */, -1 /* mode */,
-                mSplitLayout.getDividerLeash(), false /* isTranslucent */, null /* clipRect */,
-                null /* contentInsets */, Integer.MAX_VALUE /* prefixOrderIndex */,
-                new android.graphics.Point(0, 0) /* position */, bounds, bounds,
-                new WindowConfiguration(), true, null /* startLeash */, null /* startBounds */,
-                null /* taskInfo */, false /* allowEnterPip */, TYPE_DOCK_DIVIDER);
-    }
-
-    RemoteAnimationTarget getOutlineLegacyTarget() {
-        final Rect bounds = mSideStage.mRootTaskInfo.configuration.windowConfiguration.getBounds();
-        // Leverage TYPE_DOCK_DIVIDER type when wrapping outline remote animation target in order to
-        // distinguish as a split auxiliary target in Launcher.
-        return new RemoteAnimationTarget(-1 /* taskId */, -1 /* mode */,
-                mSideStage.getOutlineLeash(), false /* isTranslucent */, null /* clipRect */,
-                null /* contentInsets */, Integer.MAX_VALUE /* prefixOrderIndex */,
-                new android.graphics.Point(0, 0) /* position */, bounds, bounds,
-                new WindowConfiguration(), true, null /* startLeash */, null /* startBounds */,
-                null /* taskInfo */, false /* allowEnterPip */, TYPE_DOCK_DIVIDER);
-    }
-
-    @Override
-    public void dump(@NonNull PrintWriter pw, String prefix) {
-        final String innerPrefix = prefix + "  ";
-        final String childPrefix = innerPrefix + "  ";
-        pw.println(prefix + TAG + " mDisplayId=" + mDisplayId);
-        pw.println(innerPrefix + "mDividerVisible=" + mDividerVisible);
-        pw.println(innerPrefix + "MainStage");
-        pw.println(childPrefix + "isActive=" + mMainStage.isActive());
-        mMainStageListener.dump(pw, childPrefix);
-        pw.println(innerPrefix + "SideStage");
-        mSideStageListener.dump(pw, childPrefix);
-        pw.println(innerPrefix + "mSplitLayout=" + mSplitLayout);
-    }
-
-    /**
-     * Directly set the visibility of both splits. This assumes hasChildren matches visibility.
-     * This is intended for batch use, so it assumes other state management logic is already
-     * handled.
-     */
-    private void setSplitsVisible(boolean visible) {
-        mMainStageListener.mVisible = mSideStageListener.mVisible = visible;
-        mMainStageListener.mHasChildren = mSideStageListener.mHasChildren = visible;
-    }
-
-    /**
-     * Sets drag info to be logged when splitscreen is next entered.
-     */
-    public void logOnDroppedToSplit(@SplitPosition int position, InstanceId dragSessionId) {
-        mLogger.enterRequestedByDrag(position, dragSessionId);
-    }
-
-    /**
-     * Logs the exit of splitscreen.
-     */
-    private void logExit(int exitReason) {
-        mLogger.logExit(exitReason,
-                SPLIT_POSITION_UNDEFINED, 0 /* mainStageUid */,
-                SPLIT_POSITION_UNDEFINED, 0 /* sideStageUid */,
-                mSplitLayout.isLandscape());
-    }
-
-    /**
-     * Logs the exit of splitscreen to a specific stage. This must be called before the exit is
-     * executed.
-     */
-    private void logExitToStage(int exitReason, boolean toMainStage) {
-        mLogger.logExit(exitReason,
-                toMainStage ? getMainStagePosition() : SPLIT_POSITION_UNDEFINED,
-                toMainStage ? mMainStage.getTopChildTaskUid() : 0 /* mainStageUid */,
-                !toMainStage ? getSideStagePosition() : SPLIT_POSITION_UNDEFINED,
-                !toMainStage ? mSideStage.getTopChildTaskUid() : 0 /* sideStageUid */,
-                mSplitLayout.isLandscape());
-    }
-
-    class StageListenerImpl implements StageTaskListener.StageListenerCallbacks {
-        boolean mHasRootTask = false;
-        boolean mVisible = false;
-        boolean mHasChildren = false;
-
-        @Override
-        public void onRootTaskAppeared() {
-            mHasRootTask = true;
-            StageCoordinator.this.onStageRootTaskAppeared(this);
-        }
-
-        @Override
-        public void onStatusChanged(boolean visible, boolean hasChildren) {
-            if (!mHasRootTask) return;
-
-            if (mHasChildren != hasChildren) {
-                mHasChildren = hasChildren;
-                StageCoordinator.this.onStageHasChildrenChanged(this);
-            }
-            if (mVisible != visible) {
-                mVisible = visible;
-                StageCoordinator.this.onStageVisibilityChanged(this);
-            }
-        }
-
-        @Override
-        public void onChildTaskStatusChanged(int taskId, boolean present, boolean visible) {
-            StageCoordinator.this.onStageChildTaskStatusChanged(this, taskId, present, visible);
-        }
-
-        @Override
-        public void onRootTaskVanished() {
-            reset();
-            StageCoordinator.this.onStageRootTaskVanished(this);
-        }
-
-        @Override
-        public void onNoLongerSupportMultiWindow() {
-            if (mMainStage.isActive()) {
-                StageCoordinator.this.exitSplitScreen(null /* childrenToTop */,
-                        SPLITSCREEN_UICHANGED__EXIT_REASON__APP_DOES_NOT_SUPPORT_MULTIWINDOW);
-            }
-        }
-
-        private void reset() {
-            mHasRootTask = false;
-            mVisible = false;
-            mHasChildren = false;
-        }
-
-        public void dump(@NonNull PrintWriter pw, String prefix) {
-            pw.println(prefix + "mHasRootTask=" + mHasRootTask);
-            pw.println(prefix + "mVisible=" + mVisible);
-            pw.println(prefix + "mHasChildren=" + mHasChildren);
-        }
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskListener.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskListener.java
deleted file mode 100644
index 7b679580..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskListener.java
+++ /dev/null
@@ -1,298 +0,0 @@
-/*
- * Copyright (C) 2020 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.stagesplit;
-
-import static android.app.WindowConfiguration.ACTIVITY_TYPE_STANDARD;
-import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
-import static android.app.WindowConfiguration.WINDOWING_MODE_MULTI_WINDOW;
-import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
-
-import static com.android.wm.shell.transition.Transitions.ENABLE_SHELL_TRANSITIONS;
-
-import android.annotation.CallSuper;
-import android.annotation.Nullable;
-import android.app.ActivityManager;
-import android.graphics.Point;
-import android.graphics.Rect;
-import android.util.SparseArray;
-import android.view.SurfaceControl;
-import android.view.SurfaceSession;
-import android.window.WindowContainerTransaction;
-
-import androidx.annotation.NonNull;
-
-import com.android.wm.shell.ShellTaskOrganizer;
-import com.android.wm.shell.common.SurfaceUtils;
-import com.android.wm.shell.common.SyncTransactionQueue;
-
-import java.io.PrintWriter;
-
-/**
- * Base class that handle common task org. related for split-screen stages.
- * Note that this class and its sub-class do not directly perform hierarchy operations.
- * They only serve to hold a collection of tasks and provide APIs like
- * {@link #setBounds(Rect, WindowContainerTransaction)} for the centralized {@link StageCoordinator}
- * to perform operations in-sync with other containers.
- *
- * @see StageCoordinator
- */
-class StageTaskListener implements ShellTaskOrganizer.TaskListener {
-    private static final String TAG = StageTaskListener.class.getSimpleName();
-
-    protected static final int[] CONTROLLED_ACTIVITY_TYPES = {ACTIVITY_TYPE_STANDARD};
-    protected static final int[] CONTROLLED_WINDOWING_MODES =
-            {WINDOWING_MODE_FULLSCREEN, WINDOWING_MODE_UNDEFINED};
-    protected static final int[] CONTROLLED_WINDOWING_MODES_WHEN_ACTIVE =
-            {WINDOWING_MODE_FULLSCREEN, WINDOWING_MODE_UNDEFINED, WINDOWING_MODE_MULTI_WINDOW};
-
-    /** Callback interface for listening to changes in a split-screen stage. */
-    public interface StageListenerCallbacks {
-        void onRootTaskAppeared();
-
-        void onStatusChanged(boolean visible, boolean hasChildren);
-
-        void onChildTaskStatusChanged(int taskId, boolean present, boolean visible);
-
-        void onRootTaskVanished();
-        void onNoLongerSupportMultiWindow();
-    }
-
-    private final StageListenerCallbacks mCallbacks;
-    private final SurfaceSession mSurfaceSession;
-    protected final SyncTransactionQueue mSyncQueue;
-
-    protected ActivityManager.RunningTaskInfo mRootTaskInfo;
-    protected SurfaceControl mRootLeash;
-    protected SurfaceControl mDimLayer;
-    protected SparseArray<ActivityManager.RunningTaskInfo> mChildrenTaskInfo = new SparseArray<>();
-    private final SparseArray<SurfaceControl> mChildrenLeashes = new SparseArray<>();
-
-    private final StageTaskUnfoldController mStageTaskUnfoldController;
-
-    StageTaskListener(ShellTaskOrganizer taskOrganizer, int displayId,
-            StageListenerCallbacks callbacks, SyncTransactionQueue syncQueue,
-            SurfaceSession surfaceSession,
-            @Nullable StageTaskUnfoldController stageTaskUnfoldController) {
-        mCallbacks = callbacks;
-        mSyncQueue = syncQueue;
-        mSurfaceSession = surfaceSession;
-        mStageTaskUnfoldController = stageTaskUnfoldController;
-        taskOrganizer.createRootTask(displayId, WINDOWING_MODE_MULTI_WINDOW, this);
-    }
-
-    int getChildCount() {
-        return mChildrenTaskInfo.size();
-    }
-
-    boolean containsTask(int taskId) {
-        return mChildrenTaskInfo.contains(taskId);
-    }
-
-    /**
-     * Returns the top activity uid for the top child task.
-     */
-    int getTopChildTaskUid() {
-        for (int i = mChildrenTaskInfo.size() - 1; i >= 0; --i) {
-            final ActivityManager.RunningTaskInfo info = mChildrenTaskInfo.valueAt(i);
-            if (info.topActivityInfo == null) {
-                continue;
-            }
-            return info.topActivityInfo.applicationInfo.uid;
-        }
-        return 0;
-    }
-
-    /** @return {@code true} if this listener contains the currently focused task. */
-    boolean isFocused() {
-        if (mRootTaskInfo == null) {
-            return false;
-        }
-
-        if (mRootTaskInfo.isFocused) {
-            return true;
-        }
-
-        for (int i = mChildrenTaskInfo.size() - 1; i >= 0; --i) {
-            if (mChildrenTaskInfo.valueAt(i).isFocused) {
-                return true;
-            }
-        }
-
-        return false;
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskAppeared(ActivityManager.RunningTaskInfo taskInfo, SurfaceControl leash) {
-        if (mRootTaskInfo == null && !taskInfo.hasParentTask()) {
-            mRootLeash = leash;
-            mRootTaskInfo = taskInfo;
-            mCallbacks.onRootTaskAppeared();
-            sendStatusChanged();
-            mSyncQueue.runInSync(t -> {
-                t.hide(mRootLeash);
-                mDimLayer =
-                        SurfaceUtils.makeDimLayer(t, mRootLeash, "Dim layer", mSurfaceSession);
-            });
-        } else if (taskInfo.parentTaskId == mRootTaskInfo.taskId) {
-            final int taskId = taskInfo.taskId;
-            mChildrenLeashes.put(taskId, leash);
-            mChildrenTaskInfo.put(taskId, taskInfo);
-            updateChildTaskSurface(taskInfo, leash, true /* firstAppeared */);
-            mCallbacks.onChildTaskStatusChanged(taskId, true /* present */, taskInfo.isVisible);
-            if (ENABLE_SHELL_TRANSITIONS) {
-                // Status is managed/synchronized by the transition lifecycle.
-                return;
-            }
-            sendStatusChanged();
-        } else {
-            throw new IllegalArgumentException(this + "\n Unknown task: " + taskInfo
-                    + "\n mRootTaskInfo: " + mRootTaskInfo);
-        }
-
-        if (mStageTaskUnfoldController != null) {
-            mStageTaskUnfoldController.onTaskAppeared(taskInfo, leash);
-        }
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskInfoChanged(ActivityManager.RunningTaskInfo taskInfo) {
-        if (!taskInfo.supportsMultiWindow) {
-            // Leave split screen if the task no longer supports multi window.
-            mCallbacks.onNoLongerSupportMultiWindow();
-            return;
-        }
-        if (mRootTaskInfo.taskId == taskInfo.taskId) {
-            mRootTaskInfo = taskInfo;
-        } else if (taskInfo.parentTaskId == mRootTaskInfo.taskId) {
-            mChildrenTaskInfo.put(taskInfo.taskId, taskInfo);
-            mCallbacks.onChildTaskStatusChanged(taskInfo.taskId, true /* present */,
-                    taskInfo.isVisible);
-            if (!ENABLE_SHELL_TRANSITIONS) {
-                updateChildTaskSurface(
-                        taskInfo, mChildrenLeashes.get(taskInfo.taskId), false /* firstAppeared */);
-            }
-        } else {
-            throw new IllegalArgumentException(this + "\n Unknown task: " + taskInfo
-                    + "\n mRootTaskInfo: " + mRootTaskInfo);
-        }
-        if (ENABLE_SHELL_TRANSITIONS) {
-            // Status is managed/synchronized by the transition lifecycle.
-            return;
-        }
-        sendStatusChanged();
-    }
-
-    @Override
-    @CallSuper
-    public void onTaskVanished(ActivityManager.RunningTaskInfo taskInfo) {
-        final int taskId = taskInfo.taskId;
-        if (mRootTaskInfo.taskId == taskId) {
-            mCallbacks.onRootTaskVanished();
-            mSyncQueue.runInSync(t -> t.remove(mDimLayer));
-            mRootTaskInfo = null;
-        } else if (mChildrenTaskInfo.contains(taskId)) {
-            mChildrenTaskInfo.remove(taskId);
-            mChildrenLeashes.remove(taskId);
-            mCallbacks.onChildTaskStatusChanged(taskId, false /* present */, taskInfo.isVisible);
-            if (ENABLE_SHELL_TRANSITIONS) {
-                // Status is managed/synchronized by the transition lifecycle.
-                return;
-            }
-            sendStatusChanged();
-        } else {
-            throw new IllegalArgumentException(this + "\n Unknown task: " + taskInfo
-                    + "\n mRootTaskInfo: " + mRootTaskInfo);
-        }
-
-        if (mStageTaskUnfoldController != null) {
-            mStageTaskUnfoldController.onTaskVanished(taskInfo);
-        }
-    }
-
-    @Override
-    public void attachChildSurfaceToTask(int taskId, SurfaceControl.Builder b) {
-        b.setParent(findTaskSurface(taskId));
-    }
-
-    @Override
-    public void reparentChildSurfaceToTask(int taskId, SurfaceControl sc,
-            SurfaceControl.Transaction t) {
-        t.reparent(sc, findTaskSurface(taskId));
-    }
-
-    private SurfaceControl findTaskSurface(int taskId) {
-        if (mRootTaskInfo.taskId == taskId) {
-            return mRootLeash;
-        } else if (mChildrenLeashes.contains(taskId)) {
-            return mChildrenLeashes.get(taskId);
-        } else {
-            throw new IllegalArgumentException("There is no surface for taskId=" + taskId);
-        }
-    }
-
-    void setBounds(Rect bounds, WindowContainerTransaction wct) {
-        wct.setBounds(mRootTaskInfo.token, bounds);
-    }
-
-    void reorderChild(int taskId, boolean onTop, WindowContainerTransaction wct) {
-        if (!containsTask(taskId)) {
-            return;
-        }
-        wct.reorder(mChildrenTaskInfo.get(taskId).token, onTop /* onTop */);
-    }
-
-    void setVisibility(boolean visible, WindowContainerTransaction wct) {
-        wct.reorder(mRootTaskInfo.token, visible /* onTop */);
-    }
-
-    void onSplitScreenListenerRegistered(SplitScreen.SplitScreenListener listener,
-            @SplitScreen.StageType int stage) {
-        for (int i = mChildrenTaskInfo.size() - 1; i >= 0; --i) {
-            int taskId = mChildrenTaskInfo.keyAt(i);
-            listener.onTaskStageChanged(taskId, stage,
-                    mChildrenTaskInfo.get(taskId).isVisible);
-        }
-    }
-
-    private void updateChildTaskSurface(ActivityManager.RunningTaskInfo taskInfo,
-            SurfaceControl leash, boolean firstAppeared) {
-        final Point taskPositionInParent = taskInfo.positionInParent;
-        mSyncQueue.runInSync(t -> {
-            t.setWindowCrop(leash, null);
-            t.setPosition(leash, taskPositionInParent.x, taskPositionInParent.y);
-            if (firstAppeared && !ENABLE_SHELL_TRANSITIONS) {
-                t.setAlpha(leash, 1f);
-                t.setMatrix(leash, 1, 0, 0, 1);
-                t.show(leash);
-            }
-        });
-    }
-
-    private void sendStatusChanged() {
-        mCallbacks.onStatusChanged(mRootTaskInfo.isVisible, mChildrenTaskInfo.size() > 0);
-    }
-
-    @Override
-    @CallSuper
-    public void dump(@NonNull PrintWriter pw, String prefix) {
-        final String innerPrefix = prefix + "  ";
-        final String childPrefix = innerPrefix + "  ";
-        pw.println(prefix + this);
-    }
-}
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskUnfoldController.java b/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskUnfoldController.java
deleted file mode 100644
index 62b9da6..0000000
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/stagesplit/StageTaskUnfoldController.java
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * 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.wm.shell.stagesplit;
-
-import static android.view.Display.DEFAULT_DISPLAY;
-
-import android.animation.RectEvaluator;
-import android.animation.TypeEvaluator;
-import android.annotation.NonNull;
-import android.app.ActivityManager;
-import android.content.Context;
-import android.graphics.Rect;
-import android.util.SparseArray;
-import android.view.InsetsSource;
-import android.view.InsetsState;
-import android.view.SurfaceControl;
-
-import com.android.internal.policy.ScreenDecorationsUtils;
-import com.android.wm.shell.common.DisplayInsetsController;
-import com.android.wm.shell.common.DisplayInsetsController.OnInsetsChangedListener;
-import com.android.wm.shell.common.TransactionPool;
-import com.android.wm.shell.unfold.ShellUnfoldProgressProvider;
-import com.android.wm.shell.unfold.ShellUnfoldProgressProvider.UnfoldListener;
-import com.android.wm.shell.unfold.UnfoldBackgroundController;
-
-import java.util.concurrent.Executor;
-
-/**
- * Controls transformations of the split screen task surfaces in response
- * to the unfolding/folding action on foldable devices
- */
-public class StageTaskUnfoldController implements UnfoldListener, OnInsetsChangedListener {
-
-    private static final TypeEvaluator<Rect> RECT_EVALUATOR = new RectEvaluator(new Rect());
-    private static final float CROPPING_START_MARGIN_FRACTION = 0.05f;
-
-    private final SparseArray<AnimationContext> mAnimationContextByTaskId = new SparseArray<>();
-    private final ShellUnfoldProgressProvider mUnfoldProgressProvider;
-    private final DisplayInsetsController mDisplayInsetsController;
-    private final UnfoldBackgroundController mBackgroundController;
-    private final Executor mExecutor;
-    private final int mExpandedTaskBarHeight;
-    private final float mWindowCornerRadiusPx;
-    private final Rect mStageBounds = new Rect();
-    private final TransactionPool mTransactionPool;
-
-    private InsetsSource mTaskbarInsetsSource;
-    private boolean mBothStagesVisible;
-
-    public StageTaskUnfoldController(@NonNull Context context,
-            @NonNull TransactionPool transactionPool,
-            @NonNull ShellUnfoldProgressProvider unfoldProgressProvider,
-            @NonNull DisplayInsetsController displayInsetsController,
-            @NonNull UnfoldBackgroundController backgroundController,
-            @NonNull Executor executor) {
-        mUnfoldProgressProvider = unfoldProgressProvider;
-        mTransactionPool = transactionPool;
-        mExecutor = executor;
-        mBackgroundController = backgroundController;
-        mDisplayInsetsController = displayInsetsController;
-        mWindowCornerRadiusPx = ScreenDecorationsUtils.getWindowCornerRadius(context);
-        mExpandedTaskBarHeight = context.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.taskbar_frame_height);
-    }
-
-    /**
-     * Initializes the controller, starts listening for the external events
-     */
-    public void init() {
-        mUnfoldProgressProvider.addListener(mExecutor, this);
-        mDisplayInsetsController.addInsetsChangedListener(DEFAULT_DISPLAY, this);
-    }
-
-    @Override
-    public void insetsChanged(InsetsState insetsState) {
-        mTaskbarInsetsSource = insetsState.getSource(InsetsState.ITYPE_EXTRA_NAVIGATION_BAR);
-        for (int i = mAnimationContextByTaskId.size() - 1; i >= 0; i--) {
-            AnimationContext context = mAnimationContextByTaskId.valueAt(i);
-            context.update();
-        }
-    }
-
-    /**
-     * Called when split screen task appeared
-     * @param taskInfo info for the appeared task
-     * @param leash surface leash for the appeared task
-     */
-    public void onTaskAppeared(ActivityManager.RunningTaskInfo taskInfo, SurfaceControl leash) {
-        AnimationContext context = new AnimationContext(leash);
-        mAnimationContextByTaskId.put(taskInfo.taskId, context);
-    }
-
-    /**
-     * Called when a split screen task vanished
-     * @param taskInfo info for the vanished task
-     */
-    public void onTaskVanished(ActivityManager.RunningTaskInfo taskInfo) {
-        AnimationContext context = mAnimationContextByTaskId.get(taskInfo.taskId);
-        if (context != null) {
-            final SurfaceControl.Transaction transaction = mTransactionPool.acquire();
-            resetSurface(transaction, context);
-            transaction.apply();
-            mTransactionPool.release(transaction);
-        }
-        mAnimationContextByTaskId.remove(taskInfo.taskId);
-    }
-
-    @Override
-    public void onStateChangeProgress(float progress) {
-        if (mAnimationContextByTaskId.size() == 0 || !mBothStagesVisible) return;
-
-        final SurfaceControl.Transaction transaction = mTransactionPool.acquire();
-        mBackgroundController.ensureBackground(transaction);
-
-        for (int i = mAnimationContextByTaskId.size() - 1; i >= 0; i--) {
-            AnimationContext context = mAnimationContextByTaskId.valueAt(i);
-
-            context.mCurrentCropRect.set(RECT_EVALUATOR
-                    .evaluate(progress, context.mStartCropRect, context.mEndCropRect));
-
-            transaction.setWindowCrop(context.mLeash, context.mCurrentCropRect)
-                    .setCornerRadius(context.mLeash, mWindowCornerRadiusPx);
-        }
-
-        transaction.apply();
-
-        mTransactionPool.release(transaction);
-    }
-
-    @Override
-    public void onStateChangeFinished() {
-        resetTransformations();
-    }
-
-    /**
-     * Called when split screen visibility changes
-     * @param bothStagesVisible true if both stages of the split screen are visible
-     */
-    public void onSplitVisibilityChanged(boolean bothStagesVisible) {
-        mBothStagesVisible = bothStagesVisible;
-        if (!bothStagesVisible) {
-            resetTransformations();
-        }
-    }
-
-    /**
-     * Called when split screen stage bounds changed
-     * @param bounds new bounds for this stage
-     */
-    public void onLayoutChanged(Rect bounds) {
-        mStageBounds.set(bounds);
-
-        for (int i = mAnimationContextByTaskId.size() - 1; i >= 0; i--) {
-            final AnimationContext context = mAnimationContextByTaskId.valueAt(i);
-            context.update();
-        }
-    }
-
-    private void resetTransformations() {
-        final SurfaceControl.Transaction transaction = mTransactionPool.acquire();
-
-        for (int i = mAnimationContextByTaskId.size() - 1; i >= 0; i--) {
-            final AnimationContext context = mAnimationContextByTaskId.valueAt(i);
-            resetSurface(transaction, context);
-        }
-        mBackgroundController.removeBackground(transaction);
-        transaction.apply();
-
-        mTransactionPool.release(transaction);
-    }
-
-    private void resetSurface(SurfaceControl.Transaction transaction, AnimationContext context) {
-        transaction
-                .setWindowCrop(context.mLeash, null)
-                .setCornerRadius(context.mLeash, 0.0F);
-    }
-
-    private class AnimationContext {
-        final SurfaceControl mLeash;
-        final Rect mStartCropRect = new Rect();
-        final Rect mEndCropRect = new Rect();
-        final Rect mCurrentCropRect = new Rect();
-
-        private AnimationContext(SurfaceControl leash) {
-            this.mLeash = leash;
-            update();
-        }
-
-        private void update() {
-            mStartCropRect.set(mStageBounds);
-
-            if (mTaskbarInsetsSource != null) {
-                // Only insets the cropping window with taskbar when taskbar is expanded
-                if (mTaskbarInsetsSource.getFrame().height() >= mExpandedTaskBarHeight) {
-                    mStartCropRect.inset(mTaskbarInsetsSource
-                            .calculateVisibleInsets(mStartCropRect));
-                }
-            }
-
-            // Offset to surface coordinates as layout bounds are in screen coordinates
-            mStartCropRect.offsetTo(0, 0);
-
-            mEndCropRect.set(mStartCropRect);
-
-            int maxSize = Math.max(mEndCropRect.width(), mEndCropRect.height());
-            int margin = (int) (maxSize * CROPPING_START_MARGIN_FRACTION);
-            mStartCropRect.inset(margin, margin, margin, margin);
-        }
-    }
-}