Merge "New behavior for docked stack when going home" into nyc-dev
diff --git a/core/java/android/view/IDockedStackListener.aidl b/core/java/android/view/IDockedStackListener.aidl
index 77fa7e2..cbc8dbd 100644
--- a/core/java/android/view/IDockedStackListener.aidl
+++ b/core/java/android/view/IDockedStackListener.aidl
@@ -33,4 +33,13 @@
      * Called when the docked stack gets created or removed.
      */
     void onDockedStackExistsChanged(boolean exists);
+
+    /**
+     * Called when window manager decides to minimize the docked stack. The divider should make
+     * itself not interactable and shrink a bit in this state.
+     *
+     * @param minimized Whether the docked stack is currently minimized.
+     * @param animDuration The duration of the animation for changing the minimized state.
+     */
+    void onDockedStackMinimizedChanged(boolean minimized, long animDuration);
 }
diff --git a/core/java/com/android/internal/policy/DockedDividerUtils.java b/core/java/com/android/internal/policy/DockedDividerUtils.java
index 00c65bd..c68e506 100644
--- a/core/java/com/android/internal/policy/DockedDividerUtils.java
+++ b/core/java/com/android/internal/policy/DockedDividerUtils.java
@@ -17,9 +17,9 @@
 package com.android.internal.policy;
 
 import android.graphics.Rect;
-import android.view.WindowManager;
 
 import static android.view.WindowManager.DOCKED_BOTTOM;
+import static android.view.WindowManager.DOCKED_INVALID;
 import static android.view.WindowManager.DOCKED_LEFT;
 import static android.view.WindowManager.DOCKED_RIGHT;
 import static android.view.WindowManager.DOCKED_TOP;
@@ -35,46 +35,61 @@
             int displayWidth, int displayHeight, int dividerSize) {
         outRect.set(0, 0, displayWidth, displayHeight);
         switch (dockSide) {
-            case WindowManager.DOCKED_LEFT:
+            case DOCKED_LEFT:
                 outRect.right = position;
                 break;
-            case WindowManager.DOCKED_TOP:
+            case DOCKED_TOP:
                 outRect.bottom = position;
                 break;
-            case WindowManager.DOCKED_RIGHT:
+            case DOCKED_RIGHT:
                 outRect.left = position + dividerSize;
                 break;
-            case WindowManager.DOCKED_BOTTOM:
+            case DOCKED_BOTTOM:
                 outRect.top = position + dividerSize;
                 break;
         }
-        sanitizeStackBounds(outRect);
+        sanitizeStackBounds(outRect, dockSide == DOCKED_LEFT || dockSide == DOCKED_TOP);
     }
 
-    public static void sanitizeStackBounds(Rect bounds) {
-        if (bounds.left >= bounds.right) {
-            bounds.left = bounds.right - 1;
-        }
-        if (bounds.top >= bounds.bottom) {
-            bounds.top = bounds.bottom - 1;
-        }
-        if (bounds.right <= bounds.left) {
-            bounds.right = bounds.left + 1;
-        }
-        if (bounds.bottom <= bounds.top) {
-            bounds.bottom = bounds.top + 1;
+    /**
+     * Makes sure that the bounds are always valid, i. e. they are at least one pixel high and wide.
+     *
+     * @param bounds The bounds to sanitize.
+     * @param topLeft Pass true if the bounds are at the top/left of the screen, false if they are
+     *                at the bottom/right. This is used to determine in which direction to extend
+     *                the bounds.
+     */
+    public static void sanitizeStackBounds(Rect bounds, boolean topLeft) {
+
+        // If the bounds are either on the top or left of the screen, rather move it further to the
+        // left/top to make it more offscreen. If they are on the bottom or right, push them off the
+        // screen by moving it even more to the bottom/right.
+        if (topLeft) {
+            if (bounds.left >= bounds.right) {
+                bounds.left = bounds.right - 1;
+            }
+            if (bounds.top >= bounds.bottom) {
+                bounds.top = bounds.bottom - 1;
+            }
+        } else {
+            if (bounds.right <= bounds.left) {
+                bounds.right = bounds.left + 1;
+            }
+            if (bounds.bottom <= bounds.top) {
+                bounds.bottom = bounds.top + 1;
+            }
         }
     }
 
     public static int calculatePositionForBounds(Rect bounds, int dockSide, int dividerSize) {
         switch (dockSide) {
-            case WindowManager.DOCKED_LEFT:
+            case DOCKED_LEFT:
                 return bounds.right;
-            case WindowManager.DOCKED_TOP:
+            case DOCKED_TOP:
                 return bounds.bottom;
-            case WindowManager.DOCKED_RIGHT:
+            case DOCKED_RIGHT:
                 return bounds.left - dividerSize;
-            case WindowManager.DOCKED_BOTTOM:
+            case DOCKED_BOTTOM:
                 return bounds.top - dividerSize;
             default:
                 return 0;
@@ -109,16 +124,16 @@
 
     public static int invertDockSide(int dockSide) {
         switch (dockSide) {
-            case WindowManager.DOCKED_LEFT:
-                return WindowManager.DOCKED_RIGHT;
-            case WindowManager.DOCKED_TOP:
-                return WindowManager.DOCKED_BOTTOM;
-            case WindowManager.DOCKED_RIGHT:
-                return WindowManager.DOCKED_LEFT;
-            case WindowManager.DOCKED_BOTTOM:
-                return WindowManager.DOCKED_TOP;
+            case DOCKED_LEFT:
+                return DOCKED_RIGHT;
+            case DOCKED_TOP:
+                return DOCKED_BOTTOM;
+            case DOCKED_RIGHT:
+                return DOCKED_LEFT;
+            case DOCKED_BOTTOM:
+                return DOCKED_TOP;
             default:
-                return WindowManager.DOCKED_INVALID;
+                return DOCKED_INVALID;
         }
     }
 }
diff --git a/core/res/res/values/dimens.xml b/core/res/res/values/dimens.xml
index 8e86f78..5b527d8 100644
--- a/core/res/res/values/dimens.xml
+++ b/core/res/res/values/dimens.xml
@@ -56,6 +56,10 @@
          calculate the bounds of the stacks-->
     <dimen name="docked_stack_divider_insets">19dp</dimen>
 
+    <!-- To how much the docked stack gets reduced when we decide to minimize the docked stack, i.e.
+         when the user opens homescreen. -->
+    <dimen name="docked_stack_minimize_thickness">8dp</dimen>
+
     <!-- Min width for a tablet device -->
     <dimen name="min_xlarge_screen_width">800dp</dimen>
 
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index d88fa0b..719e554 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -1506,6 +1506,7 @@
   <java-symbol type="bool" name="target_honeycomb_needs_options_menu" />
   <java-symbol type="dimen" name="docked_stack_divider_thickness" />
   <java-symbol type="dimen" name="docked_stack_divider_insets" />
+  <java-symbol type="dimen" name="docked_stack_minimize_thickness" />
   <java-symbol type="integer" name="config_dockedStackDividerSnapMode" />
   <java-symbol type="fraction" name="docked_stack_divider_fixed_ratio" />
   <java-symbol type="dimen" name="navigation_bar_height" />
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java b/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
index 189e651..dd59fac 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/Divider.java
@@ -40,6 +40,7 @@
     private DividerView mView;
     private DockDividerVisibilityListener mDockDividerVisibilityListener;
     private boolean mVisible = false;
+    private boolean mMinimized = false;
 
     @Override
     public void start() {
@@ -81,6 +82,10 @@
     private void update(Configuration configuration) {
         removeDivider();
         addDivider(configuration);
+        if (mMinimized) {
+            mView.setMinimizedDockStack(true);
+            mWindowManager.setTouchable(false);
+        }
     }
 
     private void updateVisibility(final boolean visible) {
@@ -95,6 +100,23 @@
         });
     }
 
+    private void updateMinimizedDockedStack(final boolean minimized, final long animDuration) {
+        mView.post(new Runnable() {
+            @Override
+            public void run() {
+                if (mMinimized != minimized) {
+                    mMinimized = minimized;
+                    mWindowManager.setTouchable(!minimized);
+                    if (animDuration > 0) {
+                        mView.setMinimizedDockStack(minimized, animDuration);
+                    } else {
+                        mView.setMinimizedDockStack(minimized);
+                    }
+                }
+            }
+        });
+    }
+
     class DockDividerVisibilityListener extends IDockedStackListener.Stub {
 
         @Override
@@ -105,5 +127,11 @@
         @Override
         public void onDockedStackExistsChanged(boolean exists) throws RemoteException {
         }
+
+        @Override
+        public void onDockedStackMinimizedChanged(boolean minimized, long animDuration)
+                throws RemoteException {
+            updateMinimizedDockedStack(minimized, animDuration);
+        }
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerHandleView.java b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerHandleView.java
index 36cfac8..9118e9c 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerHandleView.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerHandleView.java
@@ -140,4 +140,9 @@
         canvas.drawRoundRect(left, top, left + mCurrentWidth, top + mCurrentHeight,
                 radius, radius, mPaint);
     }
+
+    @Override
+    public boolean hasOverlappingRendering() {
+        return false;
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
index 1bdf5a1..9fc2846 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerView.java
@@ -86,6 +86,11 @@
      */
     private static final float BOTTOM_RIGHT_SWITCH_BIGGER_FRACTION = 0.2f;
 
+    /**
+     * How much the background gets scaled when we are in the minimized dock state.
+     */
+    private static final float MINIMIZE_DOCK_SCALE = 0.375f;
+
     private static final PathInterpolator SLOWDOWN_INTERPOLATOR =
             new PathInterpolator(0.5f, 1f, 0.5f, 1f);
     private static final PathInterpolator DIM_INTERPOLATOR =
@@ -433,6 +438,47 @@
         mBackgroundLifted = false;
     }
 
+
+    public void setMinimizedDockStack(boolean minimized) {
+        updateDockSide();
+        mHandle.setAlpha(minimized ? 0f : 1f);
+        if (mDockSide == WindowManager.DOCKED_TOP) {
+            mBackground.setPivotY(0);
+            mBackground.setScaleY(minimized ? MINIMIZE_DOCK_SCALE : 1f);
+        } else if (mDockSide == WindowManager.DOCKED_LEFT
+                || mDockSide == WindowManager.DOCKED_RIGHT) {
+            mBackground.setPivotX(mDockSide == WindowManager.DOCKED_LEFT
+                    ? 0
+                    : mBackground.getWidth());
+            mBackground.setScaleX(minimized ? MINIMIZE_DOCK_SCALE : 1f);
+        }
+    }
+
+    public void setMinimizedDockStack(boolean minimized, long animDuration) {
+        updateDockSide();
+        mHandle.animate()
+                .setInterpolator(Interpolators.FAST_OUT_SLOW_IN)
+                .setDuration(animDuration)
+                .alpha(minimized ? 0f : 1f)
+                .start();
+        if (mDockSide == WindowManager.DOCKED_TOP) {
+            mBackground.setPivotY(0);
+            mBackground.animate()
+                    .scaleY(minimized ? MINIMIZE_DOCK_SCALE : 1f);
+        } else if (mDockSide == WindowManager.DOCKED_LEFT
+                || mDockSide == WindowManager.DOCKED_RIGHT) {
+            mBackground.setPivotX(mDockSide == WindowManager.DOCKED_LEFT
+                    ? 0
+                    : mBackground.getWidth());
+            mBackground.animate()
+                    .scaleX(minimized ? MINIMIZE_DOCK_SCALE : 1f);
+        }
+        mBackground.animate()
+                .setInterpolator(Interpolators.FAST_OUT_SLOW_IN)
+                .setDuration(animDuration)
+                .start();
+    }
+
     @Override
     protected void onConfigurationChanged(Configuration newConfig) {
         super.onConfigurationChanged(newConfig);
diff --git a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerWindowManager.java b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerWindowManager.java
index 2294d40..3db03d0 100644
--- a/packages/SystemUI/src/com/android/systemui/stackdivider/DividerWindowManager.java
+++ b/packages/SystemUI/src/com/android/systemui/stackdivider/DividerWindowManager.java
@@ -22,6 +22,7 @@
 import android.view.WindowManager;
 
 import static android.view.WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
+import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
 import static android.view.WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;
 import static android.view.WindowManager.LayoutParams.FLAG_SLIPPERY;
 import static android.view.WindowManager.LayoutParams.FLAG_SPLIT_TOUCH;
@@ -79,4 +80,18 @@
             mWindowManager.updateViewLayout(mView, mLp);
         }
     }
+
+    public void setTouchable(boolean touchable) {
+        boolean changed = false;
+        if (!touchable && (mLp.flags & FLAG_NOT_TOUCHABLE) == 0) {
+            mLp.flags |= FLAG_NOT_TOUCHABLE;
+            changed = true;
+        } else if (touchable && (mLp.flags & FLAG_NOT_TOUCHABLE) != 0) {
+            mLp.flags &= ~FLAG_NOT_TOUCHABLE;
+            changed = true;
+        }
+        if (changed) {
+            mWindowManager.updateViewLayout(mView, mLp);
+        }
+    }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
index 6698076..e53f044 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
@@ -512,6 +512,11 @@
                         }
                     });
                 }
+
+                @Override
+                public void onDockedStackMinimizedChanged(boolean minimized, long animDuration)
+                        throws RemoteException {
+                }
             });
         } catch (RemoteException e) {
             Log.e(TAG, "Failed registering docked stack exists listener", e);
diff --git a/services/core/java/com/android/server/am/ActivityStack.java b/services/core/java/com/android/server/am/ActivityStack.java
index 509b1bb..acde10f 100644
--- a/services/core/java/com/android/server/am/ActivityStack.java
+++ b/services/core/java/com/android/server/am/ActivityStack.java
@@ -1434,10 +1434,12 @@
 
         if (mStackId == DOCKED_STACK_ID) {
             // Docked stack is always visible, except in the case where the top running activity
-            // task in the focus stack doesn't support any form of resizing.
+            // task in the focus stack doesn't support any form of resizing but we show it for the
+            // home task even though it's not resizable.
             final ActivityRecord r = focusedStack.topRunningActivityLocked();
             final TaskRecord task = r != null ? r.task : null;
-            return task == null || task.canGoInDockedStack() ? STACK_VISIBLE : STACK_INVISIBLE;
+            return task == null || task.canGoInDockedStack() || task.isHomeTask() ? STACK_VISIBLE
+                    : STACK_INVISIBLE;
         }
 
         // Find the first stack below focused stack that actually got something visible.
diff --git a/services/core/java/com/android/server/wm/AppTransition.java b/services/core/java/com/android/server/wm/AppTransition.java
index 1821487..ad12c66 100644
--- a/services/core/java/com/android/server/wm/AppTransition.java
+++ b/services/core/java/com/android/server/wm/AppTransition.java
@@ -53,6 +53,7 @@
 import android.os.IBinder;
 import android.os.IRemoteCallback;
 import android.os.RemoteException;
+import android.util.ArraySet;
 import android.util.Slog;
 import android.util.SparseArray;
 import android.view.AppTransitionAnimationSpec;
@@ -336,14 +337,17 @@
         return false;
     }
 
-    void goodToGo(AppWindowAnimator openingAppAnimator, AppWindowAnimator closingAppAnimator) {
+    void goodToGo(AppWindowAnimator topOpeningAppAnimator, AppWindowAnimator topClosingAppAnimator,
+            ArraySet<AppWindowToken> openingApps, ArraySet<AppWindowToken> closingApps) {
         mNextAppTransition = TRANSIT_UNSET;
         mAppTransitionState = APP_STATE_RUNNING;
         notifyAppTransitionStartingLocked(
-                openingAppAnimator != null ? openingAppAnimator.mAppToken.token : null,
-                closingAppAnimator != null ? closingAppAnimator.mAppToken.token : null,
-                openingAppAnimator != null ? openingAppAnimator.animation : null,
-                closingAppAnimator != null ? closingAppAnimator.animation : null);
+                topOpeningAppAnimator != null ? topOpeningAppAnimator.mAppToken.token : null,
+                topClosingAppAnimator != null ? topClosingAppAnimator.mAppToken.token : null,
+                topOpeningAppAnimator != null ? topOpeningAppAnimator.animation : null,
+                topClosingAppAnimator != null ? topClosingAppAnimator.animation : null);
+        mService.getDefaultDisplayContentLocked().getDockedDividerController()
+                .notifyAppTransitionStarting(openingApps, closingApps);
     }
 
     void clear() {
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 144d7ac..73cea52 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -127,7 +127,7 @@
         isDefaultDisplay = mDisplayId == Display.DEFAULT_DISPLAY;
         mService = service;
         initializeDisplayBaseInfo();
-        mDividerControllerLocked = new DockedStackDividerController(service.mContext, this);
+        mDividerControllerLocked = new DockedStackDividerController(service, this);
         mDimLayerController = new DimLayerController(this);
     }
 
@@ -606,12 +606,24 @@
         return "Display " + mDisplayId + " info=" + mDisplayInfo + " stacks=" + mStacks;
     }
 
+    /**
+     * @return The docked stack, but only if it is visible, and {@code null} otherwise.
+     */
     TaskStack getDockedStackLocked() {
         final TaskStack stack = mService.mStackIdToStack.get(DOCKED_STACK_ID);
         return (stack != null && stack.isVisibleLocked()) ? stack : null;
     }
 
     /**
+     * Like {@link #getDockedStackLocked}, but also returns the docked stack if it's currently not
+     * visible, as long as it's not hidden because the current user doesn't have any tasks there.
+     */
+    TaskStack getDockedStackVisibleForUserLocked() {
+        final TaskStack stack = mService.mStackIdToStack.get(DOCKED_STACK_ID);
+        return (stack != null && stack.isVisibleForUserLocked()) ? stack : null;
+    }
+
+    /**
      * Find the visible, touch-deliverable window under the given point
      */
     WindowState getTouchableWinAtPointLocked(float xf, float yf) {
diff --git a/services/core/java/com/android/server/wm/DockedStackDividerController.java b/services/core/java/com/android/server/wm/DockedStackDividerController.java
index 75c06ff..ec99d1f 100644
--- a/services/core/java/com/android/server/wm/DockedStackDividerController.java
+++ b/services/core/java/com/android/server/wm/DockedStackDividerController.java
@@ -20,10 +20,14 @@
 import android.graphics.Rect;
 import android.os.RemoteCallbackList;
 import android.os.RemoteException;
+import android.util.ArraySet;
+import android.util.Log;
 import android.util.Slog;
 import android.view.DisplayInfo;
 import android.view.IDockedStackListener;
 import android.view.SurfaceControl;
+import android.view.animation.AnimationUtils;
+import android.view.animation.Interpolator;
 
 import com.android.server.wm.DimLayer.DimLayerUser;
 
@@ -45,25 +49,41 @@
 
     private static final String TAG = TAG_WITH_CLASS_NAME ? "DockedStackDividerController" : TAG_WM;
 
+    private static final long MINIMIZED_DOCK_ANIMATION_DURATION = 400;
+
+    private final WindowManagerService mService;
     private final DisplayContent mDisplayContent;
     private final int mDividerWindowWidth;
     private final int mDividerInsets;
     private boolean mResizing;
     private WindowState mWindow;
     private final Rect mTmpRect = new Rect();
+    private final Rect mTmpRect2 = new Rect();
     private final Rect mLastRect = new Rect();
     private boolean mLastVisibility = false;
     private final RemoteCallbackList<IDockedStackListener> mDockedStackListeners
             = new RemoteCallbackList<>();
     private final DimLayer mDimLayer;
 
-    DockedStackDividerController(Context context, DisplayContent displayContent) {
+    private boolean mMinimizedDock;
+    private boolean mAnimating;
+    private boolean mAnimationStarted;
+    private long mAnimationStartTime;
+    private float mAnimationStart;
+    private float mAnimationTarget;
+    private final Interpolator mMinimizedDockInterpolator;
+
+    DockedStackDividerController(WindowManagerService service, DisplayContent displayContent) {
+        mService = service;
         mDisplayContent = displayContent;
+        final Context context = service.mContext;
         mDividerWindowWidth = context.getResources().getDimensionPixelSize(
                 com.android.internal.R.dimen.docked_stack_divider_thickness);
         mDividerInsets = context.getResources().getDimensionPixelSize(
                 com.android.internal.R.dimen.docked_stack_divider_insets);
         mDimLayer = new DimLayer(displayContent.mService, this, displayContent.getDisplayId());
+        mMinimizedDockInterpolator = AnimationUtils.loadInterpolator(
+                context, android.R.interpolator.fast_out_slow_in);
     }
 
     boolean isResizing() {
@@ -180,6 +200,19 @@
         mDockedStackListeners.finishBroadcast();
     }
 
+    void notifyDockedStackMinimizedChanged(boolean minimizedDock, long animDuration) {
+        final int size = mDockedStackListeners.beginBroadcast();
+        for (int i = 0; i < size; ++i) {
+            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
+            try {
+                listener.onDockedStackMinimizedChanged(minimizedDock, animDuration);
+            } catch (RemoteException e) {
+                Slog.e(TAG_WM, "Error delivering minimized dock changed event.", e);
+            }
+        }
+        mDockedStackListeners.finishBroadcast();
+    }
+
     void registerDockedStackListener(IDockedStackListener listener) {
         mDockedStackListeners.register(listener);
         notifyDockedDividerVisibilityChanged(wasVisible());
@@ -207,6 +240,126 @@
         SurfaceControl.closeTransaction();
     }
 
+    /**
+     * Notifies the docked stack divider controller of a visibility change that happens without
+     * an animation.
+     */
+    void notifyAppVisibilityChanged(AppWindowToken wtoken, boolean visible) {
+        final Task task = wtoken.mTask;
+        if (!task.isHomeTask() || !task.isVisibleForUser()) {
+            return;
+        }
+
+        // If the stack is completely offscreen, this might just be an intermediate state when
+        // docking a task/launching recents at the same time, but home doesn't actually get
+        // visible after the state settles in.
+        if (isWithinDisplay(task)
+                && mDisplayContent.getDockedStackVisibleForUserLocked() != null) {
+            setMinimizedDockedStack(visible, false /* animate */);
+        }
+    }
+
+    void notifyAppTransitionStarting(ArraySet<AppWindowToken> openingApps,
+            ArraySet<AppWindowToken> closingApps) {
+        if (containsHomeTaskWithinDisplay(openingApps)) {
+            setMinimizedDockedStack(true /* minimized */, true /* animate */);
+        } else if (containsHomeTaskWithinDisplay(closingApps)) {
+            setMinimizedDockedStack(false /* minimized */, true /* animate */);
+        }
+    }
+
+    private boolean containsHomeTaskWithinDisplay(ArraySet<AppWindowToken> apps) {
+        for (int i = apps.size() - 1; i >= 0; i--) {
+            final Task task = apps.valueAt(i).mTask;
+            if (task != null && task.isHomeTask()) {
+                return isWithinDisplay(task);
+            }
+        }
+        return false;
+    }
+
+    private boolean isWithinDisplay(Task task) {
+        task.mStack.getBounds(mTmpRect);
+        mDisplayContent.getLogicalDisplayRect(mTmpRect2);
+        return mTmpRect.intersect(mTmpRect2);
+    }
+
+    /**
+     * Sets whether the docked stack is currently in a minimized state, i.e. all the tasks in the
+     * docked stack are heavily clipped so you can only see a minimal peek state.
+     *
+     * @param minimizedDock Whether the docked stack is currently minimized.
+     * @param animate Whether to animate the change.
+     */
+    private void setMinimizedDockedStack(boolean minimizedDock, boolean animate) {
+        if (minimizedDock == mMinimizedDock
+                || mDisplayContent.getDockedStackVisibleForUserLocked() == null) {
+            return;
+        }
+
+        mMinimizedDock = minimizedDock;
+        if (minimizedDock) {
+            if (animate) {
+                startAdjustAnimation(0f, 1f);
+            } else {
+                setMinimizedDockedStack(true);
+            }
+        } else {
+            if (animate) {
+                startAdjustAnimation(1f, 0f);
+            } else {
+                setMinimizedDockedStack(false);
+            }
+        }
+    }
+
+    private void startAdjustAnimation(float from, float to) {
+        mAnimating = true;
+        mAnimationStarted = false;
+        mAnimationStart = from;
+        mAnimationTarget = to;
+    }
+
+    private void setMinimizedDockedStack(boolean minimized) {
+        final TaskStack stack = mDisplayContent.getDockedStackVisibleForUserLocked();
+        if (stack == null) {
+            return;
+        }
+        if (stack.setAdjustedForMinimizedDock(minimized ? 1f : 0f)) {
+            mService.mWindowPlacerLocked.performSurfacePlacement();
+        }
+        notifyDockedStackMinimizedChanged(minimized, 0);
+    }
+
+    public boolean animate(long now) {
+        if (!mAnimating) {
+            return false;
+        }
+
+        if (!mAnimationStarted) {
+            mAnimationStarted = true;
+            mAnimationStartTime = now;
+            notifyDockedStackMinimizedChanged(mMinimizedDock,
+                    MINIMIZED_DOCK_ANIMATION_DURATION);
+        }
+        float t = Math.min(1f, (float) (now - mAnimationStartTime)
+                / MINIMIZED_DOCK_ANIMATION_DURATION);
+        t = mMinimizedDockInterpolator.getInterpolation(t);
+        final TaskStack stack = mDisplayContent.getDockedStackVisibleForUserLocked();
+        if (stack != null) {
+            final float amount = t * mAnimationTarget + (1 - t) * mAnimationStart;
+            if (stack.setAdjustedForMinimizedDock(amount)) {
+                mService.mWindowPlacerLocked.performSurfacePlacement();
+            }
+        }
+        if (t >= 1.0f) {
+            mAnimating = false;
+            return false;
+        } else {
+            return true;
+        }
+    }
+
     @Override
     public boolean isFullscreen() {
         return false;
diff --git a/services/core/java/com/android/server/wm/Task.java b/services/core/java/com/android/server/wm/Task.java
index fe55e80..325005b 100644
--- a/services/core/java/com/android/server/wm/Task.java
+++ b/services/core/java/com/android/server/wm/Task.java
@@ -357,6 +357,10 @@
         return !mHomeTask && (isResizeable() || mResizeMode == RESIZE_MODE_CROP_WINDOWS);
     }
 
+    boolean isHomeTask() {
+        return mHomeTask;
+    }
+
     private boolean inCropWindowsResizeMode() {
         return !mHomeTask && !isResizeable() && mResizeMode == RESIZE_MODE_CROP_WINDOWS;
     }
@@ -639,6 +643,19 @@
         return (tokensCount != 0) && mAppTokens.get(tokensCount - 1).showForAllUsers;
     }
 
+    boolean isVisibleForUser() {
+        for (int i = mAppTokens.size() - 1; i >= 0; i--) {
+            final AppWindowToken appToken = mAppTokens.get(i);
+            for (int j = appToken.allAppWindows.size() - 1; j >= 0; j--) {
+                WindowState window = appToken.allAppWindows.get(j);
+                if (!window.isHiddenFromUserLocked()) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
     boolean inHomeStack() {
         return mStack != null && mStack.mStackId == HOME_STACK_ID;
     }
diff --git a/services/core/java/com/android/server/wm/TaskStack.java b/services/core/java/com/android/server/wm/TaskStack.java
index 8409058..05a8943 100644
--- a/services/core/java/com/android/server/wm/TaskStack.java
+++ b/services/core/java/com/android/server/wm/TaskStack.java
@@ -75,9 +75,6 @@
     /** Content limits relative to the DisplayContent this sits in. */
     private Rect mBounds = new Rect();
 
-    /** Screen content area excluding IM windows, etc. */
-    private final Rect mContentBounds = new Rect();
-
     /** Stack bounds adjusted to screen content area (taking into account IM windows, etc.) */
     private final Rect mAdjustedBounds = new Rect();
 
@@ -103,9 +100,18 @@
     // Whether the stack and all its tasks is currently being drag-resized
     private boolean mDragResizing;
 
+    private final Rect mLastContentBounds = new Rect();
+    private final Rect mTmpAdjustedBounds = new Rect();
+    private boolean mAdjustedForIme;
+    private WindowState mImeWin;
+    private float mMinimizeAmount;
+    private final int mDockedStackMinimizeThickness;
+
     TaskStack(WindowManagerService service, int stackId) {
         mService = service;
         mStackId = stackId;
+        mDockedStackMinimizeThickness = service.mContext.getResources().getDimensionPixelSize(
+                com.android.internal.R.dimen.docked_stack_minimize_thickness);
         EventLog.writeEvent(EventLogTags.WM_STACK_CREATED, stackId);
     }
 
@@ -174,7 +180,27 @@
         return mTmpRect.equals(bounds);
     }
 
-    void alignTasksToAdjustedBounds(final Rect adjustedBounds) {
+    /**
+     * Overrides the adjusted bounds, i.e. sets temporary layout bounds which are different from
+     * the normal task bounds.
+     *
+     * @param bounds The adjusted bounds.
+     * @param keepInsets Whether to keep the insets from the original bounds or to calculate new
+     *                   ones depending on the adjusted bounds.
+     */
+    private void setAdjustedBounds(Rect bounds, boolean keepInsets) {
+        if (mAdjustedBounds.equals(bounds)) {
+            return;
+        }
+
+        mAdjustedBounds.set(bounds);
+        final boolean adjusted = !mAdjustedBounds.isEmpty();
+        alignTasksToAdjustedBounds(adjusted ? mAdjustedBounds : mBounds,
+                adjusted && keepInsets ? mBounds : null);
+        mDisplayContent.layoutNeeded = true;
+    }
+
+    private void alignTasksToAdjustedBounds(Rect adjustedBounds, Rect tempInsetBounds) {
         if (mFullscreen) {
             return;
         }
@@ -187,72 +213,15 @@
                 task.resizeLocked(null, null, false /* forced */);
                 task.getBounds(mTmpRect2);
                 task.scrollLocked(mTmpRect2);
-            } else if (task.isResizeable()) {
+            } else if (task.isResizeable() && task.mOverrideConfig != Configuration.EMPTY) {
                 task.getBounds(mTmpRect2);
                 mTmpRect2.offsetTo(adjustedBounds.left, adjustedBounds.top);
+                task.setTempInsetBounds(tempInsetBounds);
                 task.resizeLocked(mTmpRect2, task.mOverrideConfig, false /* forced */);
             }
         }
     }
 
-    void adjustForIME(final WindowState imeWin) {
-        final int dockedSide = getDockSide();
-        final boolean dockedTopOrBottom = dockedSide == DOCKED_TOP || dockedSide == DOCKED_BOTTOM;
-        final Rect adjustedBounds = mAdjustedBounds;
-        if (imeWin == null || !dockedTopOrBottom) {
-            // If mContentBounds is already empty, it means we're not applying
-            // any adjustments, so nothing to do; otherwise clear any adjustments.
-            if (!mContentBounds.isEmpty()) {
-                mContentBounds.setEmpty();
-                adjustedBounds.set(mBounds);
-                alignTasksToAdjustedBounds(adjustedBounds);
-            }
-            return;
-        }
-
-        final Rect displayContentRect = mTmpRect;
-        final Rect contentBounds = mTmpRect2;
-
-        // Calculate the content bounds excluding the area occupied by IME
-        mDisplayContent.getContentRect(displayContentRect);
-        contentBounds.set(displayContentRect);
-        int imeTop = Math.max(imeWin.getDisplayFrameLw().top, contentBounds.top);
-        imeTop += imeWin.getGivenContentInsetsLw().top;
-        if (contentBounds.bottom > imeTop) {
-            contentBounds.bottom = imeTop;
-        }
-
-        // If content bounds not changing, nothing to do.
-        if (mContentBounds.equals(contentBounds)) {
-            return;
-        }
-
-        // Content bounds changed, need to apply adjustments depending on dock sides.
-        mContentBounds.set(contentBounds);
-        adjustedBounds.set(mBounds);
-        final int yOffset = displayContentRect.bottom - contentBounds.bottom;
-
-        if (dockedSide == DOCKED_TOP) {
-            // If this stack is docked on top, we make it smaller so the bottom stack is not
-            // occluded by IME. We shift its bottom up by the height of the IME (capped by
-            // the display content rect). Note that we don't change the task bounds.
-            adjustedBounds.bottom = Math.max(
-                    adjustedBounds.bottom - yOffset, displayContentRect.top);
-        } else {
-            // If this stack is docked on bottom, we shift it up so that it's not occluded by
-            // IME. We try to move it up by the height of the IME window (although the best
-            // we could do is to make the top stack fully collapsed).
-            final int dividerWidth = mDisplayContent.mDividerControllerLocked.getContentWidth();
-            adjustedBounds.top = Math.max(
-                    adjustedBounds.top - yOffset, displayContentRect.top + dividerWidth);
-            adjustedBounds.bottom = adjustedBounds.top + mBounds.height();
-
-            // We also move the member tasks together, taking care not to resize them.
-            // Resizing might cause relaunch, and IME window may not come back after that.
-            alignTasksToAdjustedBounds(adjustedBounds);
-        }
-    }
-
     private boolean setBounds(Rect bounds) {
         boolean oldFullscreen = mFullscreen;
         int rotation = Surface.ROTATION_0;
@@ -281,14 +250,7 @@
         mBounds.set(bounds);
         mRotation = rotation;
 
-        // Clear the adjusted content bounds as they're no longer valid.
-        // If IME is still visible, these will be re-applied.
-        // Note that we don't clear mContentBounds here, so that we know the last IME
-        // adjust we applied.
-        // If user starts dragging the dock divider while IME is visible, the new bounds
-        // we received are based on the actual screen location of the divider. It already
-        // accounted for the IME window, so we don't want to adjust again.
-        mAdjustedBounds.set(mBounds);
+        updateAdjustedBounds();
 
         return true;
     }
@@ -314,10 +276,11 @@
 
     public void getBounds(Rect out) {
         if (useCurrentBounds()) {
-            // If we're currently adjusting for IME, we use the adjusted bounds; otherwise,
-            // no need to adjust the output bounds if fullscreen or the docked stack is visible
-            // since it is already what we want to represent to the rest of the system.
-            if (!mContentBounds.isEmpty()) {
+            // If we're currently adjusting for IME or minimized docked stack, we use the adjusted
+            // bounds; otherwise, no need to adjust the output bounds if fullscreen or the docked
+            // stack is visible since it is already what we want to represent to the rest of the
+            // system.
+            if (!mAdjustedBounds.isEmpty()) {
                 out.set(mAdjustedBounds);
             } else {
                 out.set(mBounds);
@@ -691,7 +654,7 @@
                 outBounds.top = dockedBounds.bottom + dockDividerWidth;
             }
         }
-        DockedDividerUtils.sanitizeStackBounds(outBounds);
+        DockedDividerUtils.sanitizeStackBounds(outBounds, !dockOnTopOrLeft);
     }
 
     /** Resizes all non-docked stacks in the system to either fullscreen or the appropriate size
@@ -802,6 +765,138 @@
         mDisplayContent = null;
     }
 
+    /**
+     * Adjusts the stack bounds if the IME is visible.
+     *
+     * @param imeWin The IME window.
+     */
+    void setAdjustedForIme(WindowState imeWin) {
+        mAdjustedForIme = true;
+        mImeWin = imeWin;
+        updateAdjustedBounds();
+    }
+
+    /**
+     * Resets the adjustment after it got adjusted for the IME.
+     */
+    void resetAdjustedForIme() {
+        mAdjustedForIme = false;
+        mImeWin = null;
+        updateAdjustedBounds();
+    }
+
+    /**
+     * Sets the amount how much we currently minimize our stack.
+     *
+     * @param minimizeAmount The amount, between 0 and 1.
+     * @return Whether the amount has changed and a layout is needed.
+     */
+    boolean setAdjustedForMinimizedDock(float minimizeAmount) {
+        if (minimizeAmount != mMinimizeAmount) {
+            mMinimizeAmount = minimizeAmount;
+            updateAdjustedBounds();
+            return isVisibleForUserLocked();
+        } else {
+            return false;
+        }
+    }
+
+    private boolean adjustForIME(final WindowState imeWin) {
+        final int dockedSide = getDockSide();
+        final boolean dockedTopOrBottom = dockedSide == DOCKED_TOP || dockedSide == DOCKED_BOTTOM;
+        final Rect adjustedBounds = mTmpAdjustedBounds;
+        if (imeWin == null || !dockedTopOrBottom) {
+            return false;
+        }
+
+        final Rect displayContentRect = mTmpRect;
+        final Rect contentBounds = mTmpRect2;
+
+        // Calculate the content bounds excluding the area occupied by IME
+        getDisplayContent().getContentRect(displayContentRect);
+        contentBounds.set(displayContentRect);
+        int imeTop = Math.max(imeWin.getDisplayFrameLw().top, contentBounds.top);
+        imeTop += imeWin.getGivenContentInsetsLw().top;
+        if (contentBounds.bottom > imeTop) {
+            contentBounds.bottom = imeTop;
+        }
+
+        // If content bounds not changing, nothing to do.
+        if (mLastContentBounds.equals(contentBounds)) {
+            return true;
+        }
+
+        // Content bounds changed, need to apply adjustments depending on dock sides.
+        mLastContentBounds.set(contentBounds);
+        adjustedBounds.set(mBounds);
+        final int yOffset = displayContentRect.bottom - contentBounds.bottom;
+
+        if (dockedSide == DOCKED_TOP) {
+            // If this stack is docked on top, we make it smaller so the bottom stack is not
+            // occluded by IME. We shift its bottom up by the height of the IME (capped by
+            // the display content rect). Note that we don't change the task bounds.
+            adjustedBounds.bottom = Math.max(
+                    adjustedBounds.bottom - yOffset, displayContentRect.top);
+        } else {
+            // If this stack is docked on bottom, we shift it up so that it's not occluded by
+            // IME. We try to move it up by the height of the IME window (although the best
+            // we could do is to make the top stack fully collapsed).
+            final int dividerWidth = getDisplayContent().mDividerControllerLocked
+                    .getContentWidth();
+            adjustedBounds.top = Math.max(
+                    adjustedBounds.top - yOffset, displayContentRect.top + dividerWidth);
+            adjustedBounds.bottom = adjustedBounds.top + mBounds.height();
+        }
+        return true;
+    }
+
+    private boolean adjustForMinimizedDockedStack(float minimizeAmount) {
+        final int dockSide = getDockSide();
+        if (dockSide == DOCKED_INVALID && !mTmpAdjustedBounds.isEmpty()) {
+            return false;
+        }
+
+        if (dockSide == DOCKED_TOP) {
+            mService.getStableInsetsLocked(mTmpRect);
+            int topInset = mTmpRect.top;
+            mTmpAdjustedBounds.set(mBounds);
+            mTmpAdjustedBounds.bottom =
+                    (int) (minimizeAmount * topInset + (1 - minimizeAmount) * mBounds.bottom);
+        } else if (dockSide == DOCKED_LEFT) {
+            mTmpAdjustedBounds.set(mBounds);
+            mTmpAdjustedBounds.right =
+                    (int) (minimizeAmount * mDockedStackMinimizeThickness
+                            + (1 - minimizeAmount) * mBounds.right);
+        } else if (dockSide == DOCKED_RIGHT) {
+            mTmpAdjustedBounds.set(mBounds);
+            mTmpAdjustedBounds.left =
+                    (int) (minimizeAmount * (mBounds.right - mDockedStackMinimizeThickness)
+                            + (1 - minimizeAmount) * mBounds.left);
+        }
+        return true;
+    }
+
+    /**
+     * Updates the adjustment depending on it's current state.
+     */
+    void updateAdjustedBounds() {
+        boolean adjust = false;
+        if (mMinimizeAmount != 0f) {
+            adjust = adjustForMinimizedDockedStack(mMinimizeAmount);
+        } else if (mAdjustedForIme) {
+            adjust = adjustForIME(mImeWin);
+        }
+        if (!adjust) {
+            mTmpAdjustedBounds.setEmpty();
+            mLastContentBounds.setEmpty();
+        }
+        setAdjustedBounds(mTmpAdjustedBounds, isAdjustedForMinimizedDockedStack());
+    }
+
+    boolean isAdjustedForMinimizedDockedStack() {
+        return mMinimizeAmount != 0f;
+    }
+
     public void dump(String prefix, PrintWriter pw) {
         pw.println(prefix + "mStackId=" + mStackId);
         pw.println(prefix + "mDeferDetach=" + mDeferDetach);
@@ -906,13 +1001,28 @@
         }
 
         for (int i = mTasks.size() - 1; i >= 0; i--) {
-            Task task = mTasks.get(i);
+            final Task task = mTasks.get(i);
             for (int j = task.mAppTokens.size() - 1; j >= 0; j--) {
                 if (!task.mAppTokens.get(j).hidden) {
                     return true;
                 }
             }
         }
+
+        return false;
+    }
+
+    /**
+     * @return true if a the stack is visible for the current in user, ignoring any other visibility
+     *         aspects, and false otherwise
+     */
+    boolean isVisibleForUserLocked() {
+        for (int i = mTasks.size() - 1; i >= 0; i--) {
+            final Task task = mTasks.get(i);
+            if (task.isVisibleForUser()) {
+                return true;
+            }
+        }
         return false;
     }
 
diff --git a/services/core/java/com/android/server/wm/WindowAnimator.java b/services/core/java/com/android/server/wm/WindowAnimator.java
index f8a4d33..38d0711 100644
--- a/services/core/java/com/android/server/wm/WindowAnimator.java
+++ b/services/core/java/com/android/server/wm/WindowAnimator.java
@@ -705,7 +705,8 @@
                 }
 
                 orAnimating(mService.getDisplayContentLocked(displayId).animateDimLayers());
-
+                orAnimating(mService.getDisplayContentLocked(displayId).getDockedDividerController()
+                        .animate(mCurrentTime));
                 //TODO (multidisplay): Magnification is supported only for the default display.
                 if (mService.mAccessibilityController != null
                         && displayId == Display.DEFAULT_DISPLAY) {
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index b661786..b41ff1c 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -116,7 +116,7 @@
 import android.view.animation.Animation;
 import android.view.inputmethod.InputMethodManagerInternal;
 import android.widget.Toast;
-import com.android.internal.R;
+
 import com.android.internal.app.IAssistScreenshotReceiver;
 import com.android.internal.os.IResultReceiver;
 import com.android.internal.util.FastPrintWriter;
@@ -4153,11 +4153,15 @@
             }
         }
 
-        if (visibilityChanged && visible && !delayed) {
-            // The token was made immediately visible, there will be no entrance animation. We need
-            // to inform the client the enter animation was finished.
-            wtoken.mEnteringAnimation = true;
-            mActivityManagerAppTransitionNotifier.onAppTransitionFinishedLocked(wtoken.token);
+        if (visibilityChanged && !delayed) {
+            if (visible) {
+                // The token was made immediately visible, there will be no entrance animation.
+                // We need to inform the client the enter animation was finished.
+                wtoken.mEnteringAnimation = true;
+                mActivityManagerAppTransitionNotifier.onAppTransitionFinishedLocked(wtoken.token);
+            }
+            getDefaultDisplayContentLocked().getDockedDividerController()
+                    .notifyAppVisibilityChanged(wtoken, visible);
         }
 
         return delayed;
@@ -8124,14 +8128,14 @@
                             for (int i = stacks.size() - 1; i >= 0; --i) {
                                 final TaskStack stack = stacks.get(i);
                                 if (stack.isVisibleLocked()) {
-                                    stack.adjustForIME(imeWin);
+                                    stack.setAdjustedForIme(imeWin);
                                 }
                             }
                         } else {
                             final ArrayList<TaskStack> stacks = displayContent.getStacks();
                             for (int i = stacks.size() - 1; i >= 0; --i) {
                                 final TaskStack stack = stacks.get(i);
-                                stack.adjustForIME(null);
+                                stack.resetAdjustedForIme();
                             }
                         }
                     }
@@ -10333,7 +10337,8 @@
     @Override
     public int getDockedStackSide() {
         synchronized (mWindowMap) {
-            TaskStack dockedStack = getDefaultDisplayContentLocked().getDockedStackLocked();
+            final TaskStack dockedStack = getDefaultDisplayContentLocked()
+                    .getDockedStackVisibleForUserLocked();
             return dockedStack == null ? DOCKED_INVALID : dockedStack.getDockSide();
         }
     }
@@ -10417,7 +10422,7 @@
         }
     }
 
-    private void getStableInsetsLocked(Rect outInsets) {
+    void getStableInsetsLocked(Rect outInsets) {
         final DisplayInfo di = getDefaultDisplayInfoLocked();
         mPolicy.getStableInsetsLw(di.rotation, di.logicalWidth, di.logicalHeight, outInsets);
     }
diff --git a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
index 4e1b644..04ee6fd 100644
--- a/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
+++ b/services/core/java/com/android/server/wm/WindowSurfacePlacer.java
@@ -676,8 +676,10 @@
                     // currently animating... let's do something.
                     final int left = w.mFrame.left;
                     final int top = w.mFrame.top;
+                    final boolean adjustedForMinimizedDockedStack = w.getTask() != null &&
+                            w.getTask().mStack.isAdjustedForMinimizedDockedStack();
                     if ((w.mAttrs.privateFlags & PRIVATE_FLAG_NO_MOVE_ANIMATION) == 0
-                            && !w.isDragResizing()) {
+                            && !w.isDragResizing() && !adjustedForMinimizedDockedStack) {
                         winAnimator.setMoveAnimation(left, top);
                     }
 
@@ -1099,6 +1101,7 @@
 
         processApplicationsAnimatingInPlace(transit);
 
+        mTmpLayerAndToken.token = null;
         handleClosingApps(transit, animLp, voiceInteraction, mTmpLayerAndToken);
         final AppWindowToken topClosingApp = mTmpLayerAndToken.token;
         final int topClosingLayer = mTmpLayerAndToken.layer;
@@ -1111,7 +1114,8 @@
         final AppWindowAnimator closingAppAnimator = (topClosingApp == null) ? null :
                 topClosingApp.mAppAnimator;
 
-        mService.mAppTransition.goodToGo(openingAppAnimator, closingAppAnimator);
+        mService.mAppTransition.goodToGo(openingAppAnimator, closingAppAnimator,
+                mService.mOpeningApps, mService.mClosingApps);
         mService.mAppTransition.postAnimationCallback();
         mService.mAppTransition.clear();