Merge "Animate pinned stack resizing."

12 files changed, 285 insertions, 36 deletions

diff --git a/cmds/am/src/com/android/commands/am/Am.java b/cmds/am/src/com/android/commands/am/Am.java
index 72e8c3b61027..d45bc5dc8789 100644
--- a/cmds/am/src/com/android/commands/am/Am.java
+++ b/cmds/am/src/com/android/commands/am/Am.java
@@ -47,7 +47,6 @@ import android.content.pm.ResolveInfo;
 import android.content.pm.UserInfo;
 import android.content.res.Configuration;
 import android.graphics.Rect;
-import android.net.Uri;
 import android.os.Binder;
 import android.os.Build;
 import android.os.Bundle;
@@ -79,7 +78,6 @@ import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
-import java.util.HashSet;
 import java.util.List;
 
 public class Am extends BaseCommand {
@@ -159,6 +157,7 @@ public class Am extends BaseCommand {
                 "       am stack start <DISPLAY_ID> <INTENT>\n" +
                 "       am stack movetask <TASK_ID> <STACK_ID> [true|false]\n" +
                 "       am stack resize <STACK_ID> <LEFT,TOP,RIGHT,BOTTOM>\n" +
+                "       am stack resize-animated <STACK_ID> <LEFT,TOP,RIGHT,BOTTOM>\n" +
                 "       am stack resize-docked-stack <LEFT,TOP,RIGHT,BOTTOM> [<TASK_LEFT,TASK_TOP,TASK_RIGHT,TASK_BOTTOM>]\n" +
                 "       am stack size-docked-stack-test: <STEP_SIZE> <l|t|r|b> [DELAY_MS]\n" +
                 "       am stack move-top-activity-to-pinned-stack: <STACK_ID> <LEFT,TOP,RIGHT,BOTTOM>\n" +
@@ -1688,6 +1687,9 @@ public class Am extends BaseCommand {
             case "resize":
                 runStackResize();
                 break;
+            case "resize-animated":
+                runStackResizeAnimated();
+                break;
             case "resize-docked-stack":
                 runStackResizeDocked();
                 break;
@@ -1756,7 +1758,18 @@ public class Am extends BaseCommand {
             System.err.println("Error: invalid input bounds");
             return;
         }
-        resizeStack(stackId, bounds, 0);
+        resizeStack(stackId, bounds, 0, false);
+    }
+
+    private void runStackResizeAnimated() throws Exception {
+        String stackIdStr = nextArgRequired();
+        int stackId = Integer.valueOf(stackIdStr);
+        final Rect bounds = getBounds();
+        if (bounds == null) {
+            System.err.println("Error: invalid input bounds");
+            return;
+        }
+        resizeStack(stackId, bounds, 0, true);
     }
 
     private void runStackResizeDocked() throws Exception {
@@ -1773,14 +1786,15 @@ public class Am extends BaseCommand {
         }
     }
 
-    private void resizeStack(int stackId, Rect bounds, int delayMs) throws Exception {
+    private void resizeStack(int stackId, Rect bounds, int delayMs, boolean animate)
+            throws Exception {
         if (bounds == null) {
             showError("Error: invalid input bounds");
             return;
         }
 
         try {
-            mAm.resizeStack(stackId, bounds, false);
+            mAm.resizeStack(stackId, bounds, false, false, animate);
             Thread.sleep(delayMs);
         } catch (RemoteException e) {
             showError("Error: resizing stack " + e);
@@ -1894,7 +1908,7 @@ public class Am extends BaseCommand {
             maxChange = Math.min(stepSize, currentPoint - minPoint);
             currentPoint -= maxChange;
             setBoundsSide(bounds, side, currentPoint);
-            resizeStack(DOCKED_STACK_ID, bounds, delayMs);
+            resizeStack(DOCKED_STACK_ID, bounds, delayMs, false);
         }
 
         System.out.println("Growing docked stack side=" + side);
@@ -1902,7 +1916,7 @@ public class Am extends BaseCommand {
             maxChange = Math.min(stepSize, maxPoint - currentPoint);
             currentPoint += maxChange;
             setBoundsSide(bounds, side, currentPoint);
-            resizeStack(DOCKED_STACK_ID, bounds, delayMs);
+            resizeStack(DOCKED_STACK_ID, bounds, delayMs, false);
         }
 
         System.out.println("Back to Original size side=" + side);
@@ -1910,7 +1924,7 @@ public class Am extends BaseCommand {
             maxChange = Math.min(stepSize, currentPoint - startPoint);
             currentPoint -= maxChange;
             setBoundsSide(bounds, side, currentPoint);
-            resizeStack(DOCKED_STACK_ID, bounds, delayMs);
+            resizeStack(DOCKED_STACK_ID, bounds, delayMs, false);
         }
     }
 
diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index 420bf31a189d..90feab4327b7 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -564,8 +564,7 @@ public class ActivityManager {
          * there isn't a display gap.
          */
         public static boolean preserveWindowOnTaskMove(int stackId) {
-            return stackId == FULLSCREEN_WORKSPACE_STACK_ID
-                    || stackId == DOCKED_STACK_ID || stackId == PINNED_STACK_ID;
+            return stackId == FULLSCREEN_WORKSPACE_STACK_ID || stackId == DOCKED_STACK_ID;
         }
 
         /**
@@ -616,6 +615,14 @@ public class ActivityManager {
         public static boolean keepVisibleDeadAppWindowOnScreen(int stackId) {
             return stackId != PINNED_STACK_ID;
         }
+
+        /**
+         * Returns true if the backdrop on the client side should match the frame of the window.
+         * Returns false, if the backdrop should be fullscreen.
+         */
+        public static boolean useWindowFrameForBackdrop(int stackId) {
+            return stackId == FREEFORM_WORKSPACE_STACK_ID || stackId == PINNED_STACK_ID;
+        }
     }
 
     /**
diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index 42ff8e83862d..cd5797ecb286 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -816,7 +816,9 @@ public abstract class ActivityManagerNative extends Binder implements IActivityM
                 r = Rect.CREATOR.createFromParcel(data);
             }
             final boolean allowResizeInDockedMode = data.readInt() == 1;
-            resizeStack(stackId, r, allowResizeInDockedMode);
+            final boolean preserveWindows = data.readInt() == 1;
+            final boolean animate = data.readInt() == 1;
+            resizeStack(stackId, r, allowResizeInDockedMode, preserveWindows, animate);
             reply.writeNoException();
             return true;
         }
@@ -3815,9 +3817,8 @@ class ActivityManagerProxy implements IActivityManager
         return res;
     }
     @Override
-    public void resizeStack(int stackId, Rect r, boolean allowResizeInDockedMode)
-            throws RemoteException
-    {
+    public void resizeStack(int stackId, Rect r, boolean allowResizeInDockedMode,
+            boolean preserveWindows, boolean animate) throws RemoteException {
         Parcel data = Parcel.obtain();
         Parcel reply = Parcel.obtain();
         data.writeInterfaceToken(IActivityManager.descriptor);
@@ -3829,6 +3830,8 @@ class ActivityManagerProxy implements IActivityManager
             data.writeInt(0);
         }
         data.writeInt(allowResizeInDockedMode ? 1 : 0);
+        data.writeInt(preserveWindows ? 1 : 0);
+        data.writeInt(animate ? 1 : 0);
         mRemote.transact(RESIZE_STACK_TRANSACTION, data, reply, 0);
         reply.readException();
         data.recycle();
diff --git a/core/java/android/app/IActivityManager.java b/core/java/android/app/IActivityManager.java
index 22de2ff7bc6e..5b3ffe05451a 100644
--- a/core/java/android/app/IActivityManager.java
+++ b/core/java/android/app/IActivityManager.java
@@ -146,8 +146,8 @@ public interface IActivityManager extends IInterface {
     public void moveTaskToDockedStack(int taskId, int createMode, boolean toTop, boolean animate,
             Rect initialBounds) throws RemoteException;
     public boolean moveTopActivityToPinnedStack(int stackId, Rect bounds) throws RemoteException;
-    public void resizeStack(int stackId, Rect bounds, boolean allowResizeInDockedMode)
-            throws RemoteException;
+    public void resizeStack(int stackId, Rect bounds, boolean allowResizeInDockedMode,
+            boolean preserveWindows, boolean animate) throws RemoteException;
 
     /**
      * Resizes the docked stack, and all other stacks as the result of the dock stack bounds change.
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/WindowManagerProxy.java b/packages/SystemUI/src/com/android/systemui/stackdivider/WindowManagerProxy.java
index 67bb58ae8fc9..24ab5063d94e 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/WindowManagerProxy.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/WindowManagerProxy.java
@@ -97,7 +97,8 @@ public class WindowManagerProxy {
         @Override
         public void run() {
             try {
-                ActivityManagerNative.getDefault().resizeStack(DOCKED_STACK_ID, null, true);
+                ActivityManagerNative.getDefault().resizeStack(DOCKED_STACK_ID, null, true, false,
+                        false);
             } catch (RemoteException e) {
                 Log.w(TAG, "Failed to resize stack: " + e);
             }
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 2c55ee26cf8f..76fbebfd14b5 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -9411,14 +9411,24 @@ public final class ActivityManagerService extends ActivityManagerNative
     }
 
     @Override
-    public void resizeStack(int stackId, Rect bounds, boolean allowResizeInDockedMode) {
+    public void resizeStack(int stackId, Rect bounds, boolean allowResizeInDockedMode,
+            boolean preserveWindows, boolean animate) {
         enforceCallingPermission(MANAGE_ACTIVITY_STACKS, "resizeStack()");
         long ident = Binder.clearCallingIdentity();
         try {
             synchronized (this) {
-                mStackSupervisor.resizeStackLocked(
-                        stackId, bounds, null /* tempTaskBounds */, null /* tempTaskInsetBounds */,
-                        !PRESERVE_WINDOWS, allowResizeInDockedMode);
+                if (animate) {
+                    if (stackId == PINNED_STACK_ID) {
+                        mWindowManager.animateResizePinnedStack(bounds);
+                    } else {
+                        throw new IllegalArgumentException("Stack: " + stackId
+                                + " doesn't support animated resize.");
+                    }
+                } else {
+                    mStackSupervisor.resizeStackLocked(stackId, bounds, null /* tempTaskBounds */,
+                            null /* tempTaskInsetBounds */, preserveWindows,
+                            allowResizeInDockedMode);
+                }
             }
         } finally {
             Binder.restoreCallingIdentity(ident);
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index 8db2f8ff50f3..11dd8a38cdbf 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -98,6 +98,7 @@ import java.io.PrintWriter;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 
 import static android.Manifest.permission.START_ANY_ACTIVITY;
@@ -2019,7 +2020,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
         // If this is a forced resize, let it go through even if the bounds is not changing,
         // as we might need a relayout due to surface size change (to/from fullscreen).
         final boolean forced = (resizeMode & RESIZE_MODE_FORCED) != 0;
-        if (task.mBounds != null && task.mBounds.equals(bounds) && !forced) {
+        if (Objects.equals(task.mBounds, bounds) && !forced) {
             // Nothing to do here...
             return true;
         }
@@ -2257,10 +2258,7 @@ public final class ActivityStackSupervisor implements DisplayListener {
             // If we didn't actual do a relaunch (indicated by kept==true meaning we kept the old
             // window), we need to clear the replace window settings. Otherwise, we schedule a
             // timeout to remove the old window if the replacing window is not coming in time.
-            // In case of the pinned stack we don't resize the task during the move, but we will
-            // resize the stack soon after so we want to retain the replacing window.
-            mWindowManager.scheduleClearReplacingWindowIfNeeded(topActivity.appToken,
-                    !kept || stackId == PINNED_STACK_ID);
+            mWindowManager.scheduleClearReplacingWindowIfNeeded(topActivity.appToken, !kept);
         }
 
         // The task might have already been running and its visibility needs to be synchronized with
@@ -2294,7 +2292,8 @@ public final class ActivityStackSupervisor implements DisplayListener {
             return false;
         }
 
-        moveActivityToStackLocked(r, PINNED_STACK_ID, "moveTopActivityToPinnedStack", bounds);
+        moveActivityToStackLocked(r, PINNED_STACK_ID, "moveTopActivityToPinnedStack", null);
+        mWindowManager.animateResizePinnedStack(bounds);
         return true;
     }
 
diff --git a/services/core/java/com/android/server/wm/AppTransition.java b/services/core/java/com/android/server/wm/AppTransition.java
index 552af03173a7..43a17c98fcc4 100644
--- a/services/core/java/com/android/server/wm/AppTransition.java
+++ b/services/core/java/com/android/server/wm/AppTransition.java
@@ -134,7 +134,7 @@ public class AppTransition implements Dump {
     /** Fraction of animation at which the recents thumbnail becomes completely transparent */
     private static final float RECENTS_THUMBNAIL_FADEOUT_FRACTION = 0.5f;
 
-    private static final int DEFAULT_APP_TRANSITION_DURATION = 336;
+    static final int DEFAULT_APP_TRANSITION_DURATION = 336;
     private static final int THUMBNAIL_APP_TRANSITION_DURATION = 336;
     private static final int THUMBNAIL_APP_TRANSITION_ALPHA_DURATION = 336;
     private static final long APP_TRANSITION_TIMEOUT_MS = 5000;
diff --git a/services/core/java/com/android/server/wm/BoundsAnimationController.java b/services/core/java/com/android/server/wm/BoundsAnimationController.java
new file mode 100644
index 000000000000..5f974785b667
--- /dev/null
+++ b/services/core/java/com/android/server/wm/BoundsAnimationController.java
@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2016 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.server.wm;
+
+import static com.android.server.wm.AppTransition.DEFAULT_APP_TRANSITION_DURATION;
+import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_ANIM;
+import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
+import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
+
+import android.animation.Animator;
+import android.animation.ValueAnimator;
+import android.graphics.Rect;
+import android.util.ArrayMap;
+import android.util.Slog;
+import android.view.animation.LinearInterpolator;
+
+/**
+ * Enables animating bounds of objects.
+ *
+ * In multi-window world bounds of both stack and tasks can change. When we need these bounds to
+ * change smoothly and not require the app to relaunch (e.g. because it handles resizes and
+ * relaunching it would cause poorer experience), these class provides a way to directly animate
+ * the bounds of the resized object.
+ *
+ * The object that is resized needs to implement {@link AnimateBoundsUser} interface.
+ */
+public class BoundsAnimationController {
+    private static final String TAG = TAG_WITH_CLASS_NAME ? "BoundsAnimationController" : TAG_WM;
+
+    // Only acccessed on UI thread.
+    private ArrayMap<AnimateBoundsUser, BoundsAnimator> mRunningAnimations = new ArrayMap<>();
+
+    private final class BoundsAnimator extends ValueAnimator
+            implements ValueAnimator.AnimatorUpdateListener, ValueAnimator.AnimatorListener {
+        private final AnimateBoundsUser mTarget;
+        private final Rect mFrom;
+        private final Rect mTo;
+        private final Rect mTmpRect;
+
+        BoundsAnimator(AnimateBoundsUser target, Rect from, Rect to) {
+            super();
+            mTarget = target;
+            mFrom = from;
+            mTo = to;
+            mTmpRect = new Rect();
+            addUpdateListener(this);
+            addListener(this);
+        }
+
+        @Override
+        public void onAnimationUpdate(ValueAnimator animation) {
+            final float value = (Float) animation.getAnimatedValue();
+            final float remains = 1 - value;
+            mTmpRect.left = (int) (mFrom.left * remains + mTo.left * value);
+            mTmpRect.top = (int) (mFrom.top * remains + mTo.top * value);
+            mTmpRect.right = (int) (mFrom.right * remains + mTo.right * value);
+            mTmpRect.bottom = (int) (mFrom.bottom * remains + mTo.bottom * value);
+            if (DEBUG_ANIM) Slog.d(TAG, "animateUpdate: mTarget=" + mTarget + ", mBounds="
+                    + mTmpRect + ", from=" + mFrom + ", mTo=" + mTo + ", value=" + value
+                    + ", remains=" + remains);
+            if (!mTarget.setSize(mTmpRect)) {
+                // Whoops, the target doesn't feel like animating anymore. Let's immediately finish
+                // any further animation.
+                animation.cancel();
+            }
+        }
+
+
+        @Override
+        public void onAnimationStart(Animator animation) {
+
+        }
+
+        @Override
+        public void onAnimationEnd(Animator animation) {
+            finishAnimation();
+        }
+
+        @Override
+        public void onAnimationCancel(Animator animation) {
+            finishAnimation();
+        }
+
+        private void finishAnimation() {
+            mTarget.finishBoundsAnimation();
+            removeListener(this);
+            removeUpdateListener(this);
+            mRunningAnimations.remove(mTarget);
+        }
+
+        @Override
+        public void onAnimationRepeat(Animator animation) {
+
+        }
+    }
+
+    public interface AnimateBoundsUser {
+        /**
+         * Asks the target to directly (without any intermediate steps, like scheduling animation)
+         * resize its bounds.
+         *
+         * @return Whether the target still wants to be animated and successfully finished the
+         * operation. If it returns false, the animation will immediately be cancelled. The target
+         * should return false when something abnormal happened, e.g. it was completely removed
+         * from the hierarchy and is not valid anymore.
+         */
+        boolean setSize(Rect bounds);
+
+        /**
+         * Callback for the target to inform it that the animation is finished, so it can do some
+         * necessary cleanup.
+         */
+        void finishBoundsAnimation();
+    }
+
+    void animateBounds(AnimateBoundsUser target, Rect from, Rect to) {
+        final BoundsAnimator existing = mRunningAnimations.get(target);
+        if (existing != null) {
+            existing.cancel();
+        }
+        BoundsAnimator animator = new BoundsAnimator(target, from, to);
+        mRunningAnimations.put(target, animator);
+        animator.setFloatValues(0f, 1f);
+        animator.setDuration(DEFAULT_APP_TRANSITION_DURATION);
+        animator.setInterpolator(new LinearInterpolator());
+        animator.start();
+    }
+}
diff --git a/services/core/java/com/android/server/wm/TaskStack.java b/services/core/java/com/android/server/wm/TaskStack.java
index f02e49e21977..e0880ad3ae92 100644
--- a/services/core/java/com/android/server/wm/TaskStack.java
+++ b/services/core/java/com/android/server/wm/TaskStack.java
@@ -20,6 +20,7 @@ import android.app.ActivityManager.StackId;
 import android.content.res.Configuration;
 import android.graphics.Rect;
 import android.os.Debug;
+import android.os.RemoteException;
 import android.util.EventLog;
 import android.util.Slog;
 import android.util.SparseArray;
@@ -47,7 +48,8 @@ import static com.android.server.wm.WindowManagerDebugConfig.DEBUG_TASK_MOVEMENT
 import static com.android.server.wm.WindowManagerService.H.RESIZE_STACK;
 import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
 
-public class TaskStack implements DimLayer.DimLayerUser {
+public class TaskStack implements DimLayer.DimLayerUser,
+        BoundsAnimationController.AnimateBoundsUser {
 
     // If the stack should be resized to fullscreen.
     private static final boolean FULLSCREEN = true;
@@ -804,4 +806,32 @@ public class TaskStack implements DimLayer.DimLayerUser {
         }
         return false;
     }
+
+    @Override  // AnimatesBounds
+    public boolean setSize(Rect bounds) {
+        synchronized (mService.mWindowMap) {
+            if (mDisplayContent == null) {
+                return false;
+            }
+        }
+        try {
+            mService.mActivityManager.resizeStack(mStackId, bounds, false, true, false);
+        } catch (RemoteException e) {
+        }
+        return true;
+    }
+
+    @Override  // AnimatesBounds
+    public void finishBoundsAnimation() {
+        synchronized (mService.mWindowMap) {
+            if (mTasks.isEmpty()) {
+                return;
+            }
+            final Task task = mTasks.get(mTasks.size() - 1);
+            if (task != null) {
+                task.setDragResizing(false);
+                mService.requestTraversal();
+            }
+        }
+    }
 }
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index 93a10156414a..2b88af414b4a 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -157,6 +157,7 @@ import java.util.List;
 import static android.app.ActivityManager.DOCKED_STACK_CREATE_MODE_TOP_OR_LEFT;
 import static android.app.ActivityManager.StackId.DOCKED_STACK_ID;
 import static android.app.ActivityManager.StackId.FREEFORM_WORKSPACE_STACK_ID;
+import static android.app.ActivityManager.StackId.PINNED_STACK_ID;
 import static android.app.StatusBarManager.DISABLE_MASK;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_BEHIND;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;
@@ -643,6 +644,9 @@ public class WindowManagerService extends IWindowManager.Stub
 
     final WindowAnimator mAnimator;
 
+    private final BoundsAnimationController mBoundsAnimationController =
+            new BoundsAnimationController();
+
     SparseArray<Task> mTaskIdToTask = new SparseArray<>();
 
     /** All of the TaskStacks in the window manager, unordered. For an ordered list call
@@ -2848,11 +2852,12 @@ public class WindowManagerService extends IWindowManager.Stub
         if ((result & WindowManagerGlobal.RELAYOUT_RES_FIRST_TIME) != 0) {
             win.prepareWindowToDisplayDuringRelayout(outConfig);
         }
-        if ((attrChanges& LayoutParams.FORMAT_CHANGED) != 0) {
-            // If the format can be changed in place yaay!
-            // If not, fall back to a surface re-build
+        if ((attrChanges & LayoutParams.FORMAT_CHANGED) != 0) {
+            // If the format can't be changed in place, preserve the old surface until the app draws
+            // on the new one. This prevents blinking when we change elevation of freeform and
+            // pinned windows.
             if (!winAnimator.tryChangeFormatInPlaceLocked()) {
-                winAnimator.destroySurfaceLocked();
+                winAnimator.preserveSurfaceLocked();
                 result |= RELAYOUT_RES_SURFACE_CHANGED
                         | WindowManagerGlobal.RELAYOUT_RES_FIRST_TIME;
             }
@@ -8085,7 +8090,8 @@ public class WindowManagerService extends IWindowManager.Stub
                 break;
                 case RESIZE_STACK: {
                     try {
-                        mActivityManager.resizeStack(msg.arg1, (Rect) msg.obj, msg.arg2 == 1);
+                        mActivityManager.resizeStack(msg.arg1, (Rect) msg.obj, msg.arg2 == 1, false,
+                                false);
                     } catch (RemoteException e) {
                         // This will not happen since we are in the same process.
                     }
@@ -10273,6 +10279,31 @@ public class WindowManagerService extends IWindowManager.Stub
         }
     }
 
+    public void animateResizePinnedStack(final Rect bounds) {
+        synchronized (mWindowMap) {
+            final TaskStack stack = mStackIdToStack.get(PINNED_STACK_ID);
+            if (stack == null) {
+                Slog.w(TAG, "animateResizePinnedStack: stackId " + PINNED_STACK_ID + " not found.");
+                return;
+            }
+            final ArrayList<Task> tasks = stack.getTasks();
+            if (tasks.isEmpty()) {
+                Slog.w(TAG, "animateResizePinnedStack: pinned stack doesn't have any tasks.");
+                return;
+            }
+            final Task task = tasks.get(tasks.size() - 1);
+            task.setDragResizing(true);
+            final Rect originalBounds = new Rect();
+            stack.getBounds(originalBounds);
+            UiThread.getHandler().post(new Runnable() {
+                @Override
+                public void run() {
+                    mBoundsAnimationController.animateBounds(stack, originalBounds, bounds);
+                }
+            });
+        }
+    }
+
     public void setTaskResizeable(int taskId, boolean resizeable) {
         synchronized (mWindowMap) {
             Task task = mTaskIdToTask.get(taskId);
diff --git a/services/core/java/com/android/server/wm/WindowState.java b/services/core/java/com/android/server/wm/WindowState.java
index c541b3f6f56b..1214948911e1 100644
--- a/services/core/java/com/android/server/wm/WindowState.java
+++ b/services/core/java/com/android/server/wm/WindowState.java
@@ -57,6 +57,7 @@ import java.io.PrintWriter;
 import java.util.ArrayList;
 
 import static android.app.ActivityManager.StackId;
+import static android.app.ActivityManager.StackId.INVALID_STACK_ID;
 import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;
 import static android.view.ViewTreeObserver.InternalInsetsInfo.TOUCHABLE_INSETS_CONTENT;
 import static android.view.ViewTreeObserver.InternalInsetsInfo.TOUCHABLE_INSETS_FRAME;
@@ -2051,10 +2052,21 @@ final class WindowState implements WindowManagerPolicy.WindowState {
         // until the window to small size, otherwise the multithread renderer will shift last
         // one or more frame to wrong offset. So here we send fullscreen backdrop if either
         // isDragResizing() or isDragResizeChanged() is true.
+        boolean resizing = isDragResizing() || isDragResizeChanged();
+        if (StackId.useWindowFrameForBackdrop(getStackId()) || !resizing) {
+            return frame;
+        }
         DisplayInfo displayInfo = getDisplayInfo();
         mTmpRect.set(0, 0, displayInfo.logicalWidth, displayInfo.logicalHeight);
-        boolean resizing = isDragResizing() || isDragResizeChanged();
-        return (inFreeformWorkspace() || !resizing) ? frame : mTmpRect;
+        return mTmpRect;
+    }
+
+    private int getStackId() {
+        final TaskStack stack = getStack();
+        if (stack == null) {
+            return INVALID_STACK_ID;
+        }
+        return stack.mStackId;
     }
 
     private void dispatchResized(Rect frame, Rect overscanInsets, Rect contentInsets,