Swipe up on nav bar to go home from -1 and widgets

More specifically, any window (e.g. qsb search) or AbstractFloatingView.

NavBarToHomeTouchController now implements TouchController directly instead
of AbstractStateChangeTouchController, as it not only dealing with
launcher states. This makes it easier to override intercept logic to
handle cases like not having window focus, for example.

AbstractFloatingViews can createHintCloseAnim() to play an animation
hinting that it is about to be closed by swiping up. Widgets sheets use
this to pull back similar to the all apps transition to home.

Bug: 129976669
Change-Id: Ie157b978d9f1ee36d5fd32cea72ec02ce40878c0

9 files changed, 220 insertions, 60 deletions

diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NavBarToHomeTouchController.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NavBarToHomeTouchController.java
index 673beff85..21ddfc015 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NavBarToHomeTouchController.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/touchcontrollers/NavBarToHomeTouchController.java
@@ -15,74 +15,131 @@
  */
 package com.android.launcher3.uioverrides.touchcontrollers;
 
+import static android.view.View.TRANSLATION_X;
+
+import static com.android.launcher3.AbstractFloatingView.TYPE_ALL;
+import static com.android.launcher3.AbstractFloatingView.TYPE_HIDE_BACK_BUTTON;
 import static com.android.launcher3.LauncherState.ALL_APPS;
 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.allapps.AllAppsTransitionController.ALL_APPS_PROGRESS;
 import static com.android.launcher3.anim.Interpolators.DEACCEL_3;
+import static com.android.launcher3.touch.AbstractStateChangeTouchController.SUCCESS_TRANSITION_PROGRESS;
 
 import android.animation.Animator;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
+import android.animation.ValueAnimator;
 import android.view.MotionEvent;
-import android.view.View;
 import android.view.animation.Interpolator;
 
+import com.android.launcher3.AbstractFloatingView;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.LauncherStateManager.AnimationConfig;
+import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.allapps.AllAppsTransitionController;
+import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.Interpolators;
-import com.android.launcher3.touch.AbstractStateChangeTouchController;
 import com.android.launcher3.touch.SwipeDetector;
 import com.android.launcher3.userevent.nano.LauncherLogProto;
+import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Command;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
+import com.android.launcher3.util.TouchController;
 import com.android.quickstep.views.RecentsView;
 
 /**
- * Handles swiping up on the nav bar to go home from overview or all apps.
+ * Handles swiping up on the nav bar to go home from launcher, e.g. overview or all apps.
  */
-public class NavBarToHomeTouchController extends AbstractStateChangeTouchController {
+public class NavBarToHomeTouchController implements TouchController, SwipeDetector.Listener {
 
     private static final Interpolator PULLBACK_INTERPOLATOR = DEACCEL_3;
 
+    private final Launcher mLauncher;
+    private final SwipeDetector mSwipeDetector;
+    private final float mPullbackDistance;
+
+    private boolean mNoIntercept;
+    private LauncherState mStartState;
+    private LauncherState mEndState = NORMAL;
+    private AnimatorPlaybackController mCurrentAnimation;
+
     public NavBarToHomeTouchController(Launcher launcher) {
-        super(launcher, SwipeDetector.VERTICAL);
+        mLauncher = launcher;
+        mSwipeDetector = new SwipeDetector(mLauncher, this, SwipeDetector.VERTICAL);
+        mPullbackDistance = mLauncher.getResources().getDimension(R.dimen.home_pullback_distance);
     }
 
     @Override
-    protected boolean canInterceptTouch(MotionEvent ev) {
+    public final boolean onControllerInterceptTouchEvent(MotionEvent ev) {
+        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
+            mStartState = mLauncher.getStateManager().getState();
+            mNoIntercept = !canInterceptTouch(ev);
+            if (mNoIntercept) {
+                return false;
+            }
+            mSwipeDetector.setDetectableScrollConditions(SwipeDetector.DIRECTION_POSITIVE, false);
+        }
+
+        if (mNoIntercept) {
+            return false;
+        }
+
+        onControllerTouchEvent(ev);
+        return mSwipeDetector.isDraggingOrSettling();
+    }
+
+    private boolean canInterceptTouch(MotionEvent ev) {
         boolean cameFromNavBar = (ev.getEdgeFlags() & Utilities.EDGE_NAV_BAR) != 0;
-        return cameFromNavBar && (mLauncher.isInState(OVERVIEW) || mLauncher.isInState(ALL_APPS));
+        if (!cameFromNavBar) {
+            return false;
+        }
+        if (mStartState == OVERVIEW || mStartState == ALL_APPS) {
+            return true;
+        }
+        if (!mLauncher.hasWindowFocus()) {
+            return true;
+        }
+        if (AbstractFloatingView.getTopOpenView(mLauncher) != null) {
+            return true;
+        }
+        return false;
     }
 
     @Override
-    protected LauncherState getTargetState(LauncherState fromState, boolean isDragTowardPositive) {
-        return isDragTowardPositive ? NORMAL : fromState;
+    public final boolean onControllerTouchEvent(MotionEvent ev) {
+        return mSwipeDetector.onTouchEvent(ev);
+    }
+
+    private float getShiftRange() {
+        return mLauncher.getDeviceProfile().heightPx;
     }
 
     @Override
-    protected float initCurrentAnimation(int animComponents) {
+    public void onDragStart(boolean start) {
+        initCurrentAnimation();
+    }
+
+    private void initCurrentAnimation() {
         long accuracy = (long) (getShiftRange() * 2);
-        final AnimatorSet anim;
-        if (mFromState == OVERVIEW) {
-            anim = new AnimatorSet();
+        final AnimatorSet anim = new AnimatorSet();
+        if (mStartState == OVERVIEW) {
             RecentsView recentsView = mLauncher.getOverviewPanel();
-            float pullbackDistance = recentsView.getPaddingStart() / 2;
+            float pullbackDist = mPullbackDistance;
             if (!recentsView.isRtl()) {
-                pullbackDistance = -pullbackDistance;
+                pullbackDist = -pullbackDist;
             }
-            anim.play(ObjectAnimator.ofFloat(recentsView, View.TRANSLATION_X, pullbackDistance));
-            anim.setInterpolator(PULLBACK_INTERPOLATOR);
-        } else { // if (mFromState == ALL_APPS)
+            Animator pullback = ObjectAnimator.ofFloat(recentsView, TRANSLATION_X, pullbackDist);
+            pullback.setInterpolator(PULLBACK_INTERPOLATOR);
+            anim.play(pullback);
+        } else if (mStartState == ALL_APPS) {
             AnimatorSetBuilder builder = new AnimatorSetBuilder();
             AllAppsTransitionController allAppsController = mLauncher.getAllAppsController();
-            final float pullbackDistance = mLauncher.getDeviceProfile().allAppsIconSizePx / 2;
             Animator allAppsProgress = ObjectAnimator.ofFloat(allAppsController, ALL_APPS_PROGRESS,
-                    -pullbackDistance / allAppsController.getShiftRange());
+                    -mPullbackDistance / allAppsController.getShiftRange());
             allAppsProgress.setInterpolator(PULLBACK_INTERPOLATOR);
             builder.play(allAppsProgress);
             // Slightly fade out all apps content to further distinguish from scrolling.
@@ -90,52 +147,79 @@ public class NavBarToHomeTouchController extends AbstractStateChangeTouchControl
                     .mapToProgress(PULLBACK_INTERPOLATOR, 0, 0.5f));
             AnimationConfig config = new AnimationConfig();
             config.duration = accuracy;
-            allAppsController.setAlphas(mToState.getVisibleElements(mLauncher), config, builder);
-            anim = builder.build();
+            allAppsController.setAlphas(mEndState.getVisibleElements(mLauncher), config, builder);
+            anim.play(builder.build());
+        }
+        AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(mLauncher);
+        if (topView != null) {
+            Animator hintCloseAnim = topView.createHintCloseAnim(mPullbackDistance);
+            if (hintCloseAnim != null) {
+                hintCloseAnim.setInterpolator(PULLBACK_INTERPOLATOR);
+                anim.play(hintCloseAnim);
+            }
         }
         anim.setDuration(accuracy);
         mCurrentAnimation = AnimatorPlaybackController.wrap(anim, accuracy, this::clearState);
-        return -1 / getShiftRange();
+    }
+
+    private void clearState() {
+        mCurrentAnimation = null;
+        mSwipeDetector.finishedScrolling();
+        mSwipeDetector.setDetectableScrollConditions(0, false);
     }
 
     @Override
-    public void onDragStart(boolean start) {
-        super.onDragStart(start);
-        mStartContainerType = LauncherLogProto.ContainerType.NAVBAR;
+    public boolean onDrag(float displacement) {
+        // Only allow swipe up.
+        displacement = Math.min(0, displacement);
+        float progress = Utilities.getProgress(displacement, 0, getShiftRange());
+        mCurrentAnimation.setPlayFraction(progress);
+        return true;
     }
 
     @Override
     public void onDragEnd(float velocity, boolean fling) {
         final int logAction = fling ? Touch.FLING : Touch.SWIPE;
-        float interpolatedProgress = PULLBACK_INTERPOLATOR.getInterpolation(
-                mCurrentAnimation.getProgressFraction());
-        if (interpolatedProgress >= SUCCESS_TRANSITION_PROGRESS || velocity < 0 && fling) {
-            mLauncher.getStateManager().goToState(mToState, true,
-                    () -> onSwipeInteractionCompleted(mToState, logAction));
+        float progress = mCurrentAnimation.getProgressFraction();
+        float interpolatedProgress = PULLBACK_INTERPOLATOR.getInterpolation(progress);
+        boolean success = interpolatedProgress >= SUCCESS_TRANSITION_PROGRESS
+                || (velocity < 0 && fling);
+        if (success) {
+            mLauncher.getStateManager().goToState(mEndState, true,
+                    () -> onSwipeInteractionCompleted(mEndState));
+            if (mStartState != mEndState) {
+                logStateChange(mStartState.containerType, logAction);
+            }
+            AbstractFloatingView topOpenView = AbstractFloatingView.getTopOpenView(mLauncher);
+            if (topOpenView != null) {
+                AbstractFloatingView.closeAllOpenViews(mLauncher);
+                logStateChange(topOpenView.getLogContainerType(), logAction);
+            }
         } else {
             // Quickly return to the state we came from (we didn't move far).
-            AnimatorPlaybackController anim = mLauncher.getStateManager()
-                    .createAnimationToNewWorkspace(mFromState, 80);
-            anim.setEndAction(() -> onSwipeInteractionCompleted(mFromState, logAction));
-            anim.start();
+            ValueAnimator anim = mCurrentAnimation.getAnimationPlayer();
+            anim.setFloatValues(progress, 0);
+            anim.addListener(new AnimationSuccessListener() {
+                @Override
+                public void onAnimationSuccess(Animator animator) {
+                    onSwipeInteractionCompleted(mStartState);
+                }
+            });
+            anim.setDuration(80).start();
         }
-        mCurrentAnimation.dispatchOnCancel();
-    }
-
-    @Override
-    protected int getDirectionForLog() {
-        return LauncherLogProto.Action.Direction.UP;
     }
 
-    @Override
-    protected boolean goingBetweenNormalAndOverview(LauncherState fromState,
-            LauncherState toState) {
-        // We don't want to create an atomic animation to/from overview.
-        return false;
+    private void onSwipeInteractionCompleted(LauncherState targetState) {
+        clearState();
+        mLauncher.getStateManager().goToState(targetState, false /* animated */);
     }
 
-    @Override
-    protected int getLogContainerTypeForNormalState() {
-        return LauncherLogProto.ContainerType.NAVBAR;
+    private void logStateChange(int startContainerType, int logAction) {
+        mLauncher.getUserEventDispatcher().logStateChangeAction(logAction,
+                LauncherLogProto.Action.Direction.UP,
+                LauncherLogProto.ContainerType.NAVBAR,
+                startContainerType,
+                mEndState.containerType,
+                mLauncher.getWorkspace().getCurrentPage());
     }
 }
diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index 97f2de762..9e1833c75 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -68,4 +68,7 @@
     <!-- Assistant Gestures -->
     <dimen name="gestures_assistant_size">28dp</dimen>
     <dimen name="gestures_assistant_drag_threshold">70dp</dimen>
+
+    <!-- Distance to move elements when swiping up to go home from launcher -->
+    <dimen name="home_pullback_distance">28dp</dimen>
 </resources>
diff --git a/src/com/android/launcher3/AbstractFloatingView.java b/src/com/android/launcher3/AbstractFloatingView.java
index 599a3533d..e7d7a69fd 100644
--- a/src/com/android/launcher3/AbstractFloatingView.java
+++ b/src/com/android/launcher3/AbstractFloatingView.java
@@ -19,9 +19,11 @@ package com.android.launcher3;
 import static android.view.accessibility.AccessibilityEvent.TYPE_VIEW_FOCUSED;
 import static android.view.accessibility.AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED;
 import static android.view.accessibility.AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED;
+
 import static com.android.launcher3.compat.AccessibilityManagerCompat.isAccessibilityEnabled;
 import static com.android.launcher3.compat.AccessibilityManagerCompat.sendCustomAccessibilityEvent;
 
+import android.animation.Animator;
 import android.annotation.SuppressLint;
 import android.content.Context;
 import android.util.AttributeSet;
@@ -30,7 +32,11 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.widget.LinearLayout;
 
+import androidx.annotation.IntDef;
+import androidx.annotation.Nullable;
+
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
+import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.util.TouchController;
 import com.android.launcher3.views.ActivityContext;
 import com.android.launcher3.views.BaseDragLayer;
@@ -38,8 +44,6 @@ import com.android.launcher3.views.BaseDragLayer;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
-import androidx.annotation.IntDef;
-
 /**
  * Base class for a View which shows a floating UI on top of the launcher UI.
  */
@@ -124,8 +128,20 @@ public abstract class AbstractFloatingView extends LinearLayout implements Touch
 
     protected abstract void handleClose(boolean animate);
 
+    /**
+     * Creates a user-controlled animation to hint that the view will be closed if completed.
+     * @param distanceToMove The max distance that elements should move from their starting point.
+     */
+    public @Nullable Animator createHintCloseAnim(float distanceToMove) {
+        return null;
+    }
+
     public abstract void logActionCommand(int command);
 
+    public int getLogContainerType() {
+        return ContainerType.DEFAULT_CONTAINERTYPE;
+    }
+
     public final boolean isOpen() {
         return mIsOpen;
     }
diff --git a/src/com/android/launcher3/folder/Folder.java b/src/com/android/launcher3/folder/Folder.java
index bcddd037e..2ce663433 100644
--- a/src/com/android/launcher3/folder/Folder.java
+++ b/src/com/android/launcher3/folder/Folder.java
@@ -1406,7 +1406,12 @@ public class Folder extends AbstractFloatingView implements ClipPathView, DragSo
     @Override
     public void logActionCommand(int command) {
         mLauncher.getUserEventDispatcher().logActionCommand(
-                command, getFolderIcon(), ContainerType.FOLDER);
+                command, getFolderIcon(), getLogContainerType());
+    }
+
+    @Override
+    public int getLogContainerType() {
+        return ContainerType.FOLDER;
     }
 
     @Override
diff --git a/src/com/android/launcher3/popup/PopupContainerWithArrow.java b/src/com/android/launcher3/popup/PopupContainerWithArrow.java
index 080a0cb69..593dbd46c 100644
--- a/src/com/android/launcher3/popup/PopupContainerWithArrow.java
+++ b/src/com/android/launcher3/popup/PopupContainerWithArrow.java
@@ -157,7 +157,12 @@ public class PopupContainerWithArrow extends ArrowPopup implements DragSource,
     @Override
     public void logActionCommand(int command) {
         mLauncher.getUserEventDispatcher().logActionCommand(
-                command, mOriginalIcon, ContainerType.DEEPSHORTCUTS);
+                command, mOriginalIcon, getLogContainerType());
+    }
+
+    @Override
+    public int getLogContainerType() {
+        return ContainerType.DEEPSHORTCUTS;
     }
 
     public OnClickListener getItemClickListener() {
diff --git a/src/com/android/launcher3/views/BottomUserEducationView.java b/src/com/android/launcher3/views/BottomUserEducationView.java
index a291fc605..bdc69af69 100644
--- a/src/com/android/launcher3/views/BottomUserEducationView.java
+++ b/src/com/android/launcher3/views/BottomUserEducationView.java
@@ -15,6 +15,8 @@
  */
 package com.android.launcher3.views;
 
+import static com.android.launcher3.compat.AccessibilityManagerCompat.sendCustomAccessibilityEvent;
+
 import android.animation.PropertyValuesHolder;
 import android.content.Context;
 import android.graphics.Rect;
@@ -28,8 +30,7 @@ import com.android.launcher3.Insettable;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.R;
 import com.android.launcher3.anim.Interpolators;
-
-import static com.android.launcher3.compat.AccessibilityManagerCompat.sendCustomAccessibilityEvent;
+import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 
 public class BottomUserEducationView extends AbstractSlideInView implements Insettable {
 
@@ -71,6 +72,11 @@ public class BottomUserEducationView extends AbstractSlideInView implements Inse
     }
 
     @Override
+    public int getLogContainerType() {
+        return ContainerType.TIP;
+    }
+
+    @Override
     protected boolean isOfType(int type) {
         return (type & TYPE_ON_BOARD_POPUP) != 0;
     }
diff --git a/src/com/android/launcher3/widget/BaseWidgetSheet.java b/src/com/android/launcher3/widget/BaseWidgetSheet.java
index df8266119..72cddc780 100644
--- a/src/com/android/launcher3/widget/BaseWidgetSheet.java
+++ b/src/com/android/launcher3/widget/BaseWidgetSheet.java
@@ -162,11 +162,16 @@ abstract class BaseWidgetSheet extends AbstractSlideInView
 
     @Override
     public final void logActionCommand(int command) {
-        Target target = newContainerTarget(ContainerType.WIDGETS);
+        Target target = newContainerTarget(getLogContainerType());
         target.cardinality = getElementsRowCount();
         mLauncher.getUserEventDispatcher().logActionCommand(command, target);
     }
 
+    @Override
+    public int getLogContainerType() {
+        return ContainerType.WIDGETS;
+    }
+
     protected abstract int getElementsRowCount();
 
     protected SystemUiController getSystemUiController() {
diff --git a/src/com/android/launcher3/widget/WidgetsBottomSheet.java b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
index 05368faa6..3e2c0aef4 100644
--- a/src/com/android/launcher3/widget/WidgetsBottomSheet.java
+++ b/src/com/android/launcher3/widget/WidgetsBottomSheet.java
@@ -16,10 +16,13 @@
 
 package com.android.launcher3.widget;
 
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.content.Context;
 import android.graphics.Rect;
 import android.util.AttributeSet;
+import android.util.IntProperty;
 import android.util.Pair;
 import android.view.Gravity;
 import android.view.LayoutInflater;
@@ -27,6 +30,8 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import androidx.annotation.Nullable;
+
 import com.android.launcher3.Insettable;
 import com.android.launcher3.ItemInfo;
 import com.android.launcher3.LauncherAppState;
@@ -43,6 +48,20 @@ import java.util.List;
  */
 public class WidgetsBottomSheet extends BaseWidgetSheet implements Insettable {
 
+    private static final IntProperty<View> PADDING_BOTTOM =
+            new IntProperty<View>("paddingBottom") {
+                @Override
+                public void setValue(View view, int paddingBottom) {
+                    view.setPadding(view.getPaddingLeft(), view.getPaddingTop(),
+                            view.getPaddingRight(), paddingBottom);
+                }
+
+                @Override
+                public Integer get(View view) {
+                    return view.getPaddingBottom();
+                }
+            };
+
     private static final int DEFAULT_CLOSE_DURATION = 200;
     private ItemInfo mOriginalItemInfo;
     private Rect mInsets;
@@ -158,8 +177,7 @@ public class WidgetsBottomSheet extends BaseWidgetSheet implements Insettable {
         int rightInset = insets.right - mInsets.right;
         int bottomInset = insets.bottom - mInsets.bottom;
         mInsets.set(insets);
-        setPadding(getPaddingLeft() + leftInset, getPaddingTop(),
-                getPaddingRight() + rightInset, getPaddingBottom() + bottomInset);
+        setPadding(leftInset, getPaddingTop(), rightInset, bottomInset);
     }
 
     @Override
@@ -172,4 +190,10 @@ public class WidgetsBottomSheet extends BaseWidgetSheet implements Insettable {
         return Pair.create(findViewById(R.id.title),  getContext().getString(
                 mIsOpen ? R.string.widgets_list : R.string.widgets_list_closed));
     }
+
+    @Nullable
+    @Override
+    public Animator createHintCloseAnim(float distanceToMove) {
+        return ObjectAnimator.ofInt(this, PADDING_BOTTOM, (int) (distanceToMove + mInsets.bottom));
+    }
 }
diff --git a/src/com/android/launcher3/widget/WidgetsFullSheet.java b/src/com/android/launcher3/widget/WidgetsFullSheet.java
index ec06d1e6d..521f5117a 100644
--- a/src/com/android/launcher3/widget/WidgetsFullSheet.java
+++ b/src/com/android/launcher3/widget/WidgetsFullSheet.java
@@ -17,6 +17,8 @@ package com.android.launcher3.widget;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
+import android.animation.AnimatorSet;
+import android.animation.ObjectAnimator;
 import android.animation.PropertyValuesHolder;
 import android.content.Context;
 import android.graphics.Rect;
@@ -27,6 +29,9 @@ import android.view.MotionEvent;
 import android.view.View;
 import android.view.animation.AnimationUtils;
 
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+
 import com.android.launcher3.Insettable;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherAppState;
@@ -35,8 +40,6 @@ import com.android.launcher3.R;
 import com.android.launcher3.views.RecyclerViewFastScroller;
 import com.android.launcher3.views.TopRoundedCornerView;
 
-import androidx.annotation.VisibleForTesting;
-
 /**
  * Popup for showing the full list of available widgets
  */
@@ -235,4 +238,13 @@ public class WidgetsFullSheet extends BaseWidgetSheet
     protected int getElementsRowCount() {
         return mAdapter.getItemCount();
     }
+
+    @Nullable
+    @Override
+    public Animator createHintCloseAnim(float distanceToMove) {
+        AnimatorSet anim = new AnimatorSet();
+        anim.play(ObjectAnimator.ofFloat(mRecyclerView, TRANSLATION_Y, -distanceToMove));
+        anim.play(ObjectAnimator.ofFloat(mRecyclerView, ALPHA, 0.5f));
+        return anim;
+    }
 }