Update overview from home transitions am: 03a4a0cd53

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/12184426 Change-Id: Iac33ad0742264a97e754a1cc4336ed3ab727944a
2020-08-10 21:29:00 +00:00
parent 2fe0d5f71d 03a4a0cd53
commit cf5aea05b3
9 changed files with 293 additions and 76 deletions
@@ -17,6 +17,7 @@ package com.android.launcher3.uioverrides;

 import static com.android.launcher3.LauncherState.OVERVIEW_BUTTONS;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_OVERVIEW_ACTIONS_FADE;
 import static com.android.quickstep.views.RecentsView.CONTENT_ALPHA;
 import static com.android.quickstep.views.RecentsView.FULLSCREEN_PROGRESS;
 import static com.android.quickstep.views.RecentsView.TASK_MODALNESS;
@@ -57,7 +58,7 @@ public final class RecentsViewStateController extends
            mRecentsView.updateEmptyMessage();
            mRecentsView.resetTaskVisuals();
        }
-        setAlphas(PropertySetter.NO_ANIM_PROPERTY_SETTER, state);
+        setAlphas(PropertySetter.NO_ANIM_PROPERTY_SETTER, new StateAnimationConfig(), state);
        mRecentsView.setFullscreenProgress(state.getOverviewFullscreenProgress());
    }

@@ -75,17 +76,19 @@ public final class RecentsViewStateController extends
                    AnimationSuccessListener.forRunnable(mRecentsView::resetTaskVisuals));
        }

-        setAlphas(builder, toState);
+        setAlphas(builder, config, toState);
        builder.setFloat(mRecentsView, FULLSCREEN_PROGRESS,
                toState.getOverviewFullscreenProgress(), LINEAR);
    }

-    private void setAlphas(PropertySetter propertySetter, LauncherState state) {
+    private void setAlphas(PropertySetter propertySetter, StateAnimationConfig config,
+            LauncherState state) {
        float buttonAlpha = (state.getVisibleElements(mLauncher) & OVERVIEW_BUTTONS) != 0 ? 1 : 0;
        propertySetter.setFloat(mRecentsView.getClearAllButton(), ClearAllButton.VISIBILITY_ALPHA,
                buttonAlpha, LINEAR);
        propertySetter.setFloat(mLauncher.getActionsView().getVisibilityAlpha(),
-                MultiValueAlpha.VALUE, buttonAlpha, LINEAR);
+                MultiValueAlpha.VALUE, buttonAlpha, config.getInterpolator(
+                        ANIM_OVERVIEW_ACTIONS_FADE, LINEAR));
    }

    @Override
@@ -25,6 +25,7 @@ import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.LauncherState.OVERVIEW_PEEK;
 import static com.android.launcher3.WorkspaceStateTransitionAnimation.getSpringScaleAnimator;
 import static com.android.launcher3.anim.Interpolators.ACCEL;
+import static com.android.launcher3.anim.Interpolators.ACCEL_DEACCEL;
 import static com.android.launcher3.anim.Interpolators.DEACCEL;
 import static com.android.launcher3.anim.Interpolators.DEACCEL_1_7;
 import static com.android.launcher3.anim.Interpolators.DEACCEL_3;
@@ -163,10 +164,15 @@ public class QuickstepAtomicAnimationFactory extends
            config.setInterpolator(ANIM_WORKSPACE_FADE, ACCEL);
            config.setInterpolator(ANIM_ALL_APPS_FADE, ACCEL);
            config.setInterpolator(ANIM_OVERVIEW_SCALE, clampToProgress(ACCEL, 0, 0.9f));
-            config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_X, ACCEL);
-            config.setInterpolator(ANIM_OVERVIEW_FADE, DEACCEL_1_7);
-            Workspace workspace = mActivity.getWorkspace();
+            config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_X, ACCEL_DEACCEL);

+            if (SysUINavigationMode.getMode(mActivity) == NO_BUTTON) {
+                config.setInterpolator(ANIM_OVERVIEW_FADE, FINAL_FRAME);
+            } else {
+                config.setInterpolator(ANIM_OVERVIEW_FADE, DEACCEL_1_7);
+            }
+
+            Workspace workspace = mActivity.getWorkspace();
            // Start from a higher workspace scale, but only if we're invisible so we don't jump.
            boolean isWorkspaceVisible = workspace.getVisibility() == VISIBLE;
            if (isWorkspaceVisible) {
@@ -206,8 +212,10 @@ public class QuickstepAtomicAnimationFactory extends
                config.setInterpolator(ANIM_WORKSPACE_SCALE,
                        fromState == NORMAL ? ACCEL : OVERSHOOT_1_2);
                config.setInterpolator(ANIM_WORKSPACE_TRANSLATE, ACCEL);
+                config.setInterpolator(ANIM_OVERVIEW_FADE, INSTANT);
            } else {
                config.setInterpolator(ANIM_WORKSPACE_SCALE, OVERSHOOT_1_2);
+                config.setInterpolator(ANIM_OVERVIEW_FADE, OVERSHOOT_1_2);

                // Scale up the recents, if it is not coming from the side
                RecentsView overview = mActivity.getOverviewPanel();
@@ -225,7 +233,6 @@ public class QuickstepAtomicAnimationFactory extends
                    : OVERSHOOT_1_7;
            config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_X, translationInterpolator);
            config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_Y, translationInterpolator);
-            config.setInterpolator(ANIM_OVERVIEW_FADE, OVERSHOOT_1_2);
        } else if (fromState == HINT_STATE && toState == NORMAL) {
            config.setInterpolator(ANIM_DEPTH, DEACCEL_3);
            if (mHintToNormalDuration == -1) {
@@ -19,13 +19,13 @@ import static com.android.launcher3.AbstractFloatingView.TYPE_ALL;
 import static com.android.launcher3.AbstractFloatingView.TYPE_ALL_APPS_EDU;
 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.config.FeatureFlags.ENABLE_ALL_APPS_EDU;
 import static com.android.launcher3.config.FeatureFlags.ENABLE_QUICKSTEP_LIVE_TILE;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_HOME_GESTURE;
 import static com.android.launcher3.touch.AbstractStateChangeTouchController.SUCCESS_TRANSITION_PROGRESS;
-import static com.android.quickstep.views.RecentsView.ADJACENT_PAGE_OFFSET;
 import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_RECENTS;

 import android.animation.ValueAnimator;
@@ -45,6 +45,7 @@ import com.android.launcher3.anim.Interpolators;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
+import com.android.launcher3.graphics.OverviewScrim;
 import com.android.launcher3.logging.StatsLogManager;
 import com.android.launcher3.states.StateAnimationConfig;
 import com.android.launcher3.testing.TestProtocol;
@@ -52,7 +53,9 @@ import com.android.launcher3.touch.SingleAxisSwipeDetector;
 import com.android.launcher3.userevent.nano.LauncherLogProto;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
 import com.android.launcher3.util.TouchController;
+import com.android.quickstep.util.AnimatorControllerWithResistance;
 import com.android.quickstep.util.AssistantUtilities;
+import com.android.quickstep.util.OverviewToHomeAnim;
 import com.android.quickstep.views.RecentsView;
 import com.android.systemui.shared.system.ActivityManagerWrapper;

@@ -63,6 +66,8 @@ public class NavBarToHomeTouchController implements TouchController,
        SingleAxisSwipeDetector.Listener {

    private static final Interpolator PULLBACK_INTERPOLATOR = DEACCEL_3;
+    // How much of the overview scrim we can remove during the transition.
+    private static final float OVERVIEW_TO_HOME_SCRIM_PROGRESS = 0.5f;

    private final Launcher mLauncher;
    private final SingleAxisSwipeDetector mSwipeDetector;
@@ -156,8 +161,13 @@ public class NavBarToHomeTouchController implements TouchController,
        final PendingAnimation builder = new PendingAnimation(accuracy);
        if (mStartState.overviewUi) {
            RecentsView recentsView = mLauncher.getOverviewPanel();
-            builder.setFloat(recentsView, ADJACENT_PAGE_OFFSET,
-                    -mPullbackDistance / recentsView.getPageOffsetScale(), PULLBACK_INTERPOLATOR);
+            AnimatorControllerWithResistance.createRecentsResistanceFromOverviewAnim(mLauncher,
+                    builder);
+            float endScrimAlpha = Utilities.mapRange(OVERVIEW_TO_HOME_SCRIM_PROGRESS,
+                    mStartState.getOverviewScrimAlpha(mLauncher),
+                    mEndState.getOverviewScrimAlpha(mLauncher));
+            builder.setFloat(mLauncher.getDragLayer().getOverviewScrim(),
+                    OverviewScrim.SCRIM_PROGRESS, endScrimAlpha, PULLBACK_INTERPOLATOR);
            if (ENABLE_QUICKSTEP_LIVE_TILE.get()) {
                builder.addOnFrameCallback(recentsView::redrawLiveTile);
            }
@@ -211,8 +221,13 @@ public class NavBarToHomeTouchController implements TouchController,
                recentsView.switchToScreenshot(null,
                        () -> recentsView.finishRecentsAnimation(true /* toRecents */, null));
            }
-            mLauncher.getStateManager().goToState(mEndState, true,
-                    () -> onSwipeInteractionCompleted(mEndState));
+            if (mStartState == OVERVIEW) {
+                new OverviewToHomeAnim(mLauncher, () -> onSwipeInteractionCompleted(mEndState))
+                        .animateWithVelocity(velocity);
+            } else {
+                mLauncher.getStateManager().goToState(mEndState, true,
+                        () -> onSwipeInteractionCompleted(mEndState));
+            }
            if (mStartState != mEndState) {
                logStateChange(mStartState.containerType, logAction);
            }
@@ -21,11 +21,8 @@ import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.Utilities.EDGE_NAV_BAR;
 import static com.android.launcher3.anim.Interpolators.ACCEL_DEACCEL;
-import static com.android.launcher3.states.StateAnimationConfig.PLAY_ATOMIC_OVERVIEW_PEEK;
 import static com.android.launcher3.util.VibratorWrapper.OVERVIEW_HAPTIC;

-import android.animation.Animator;
-import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.graphics.PointF;
@@ -35,14 +32,15 @@ import android.view.MotionEvent;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherState;
 import com.android.launcher3.Utilities;
-import com.android.launcher3.anim.AnimationSuccessListener;
+import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.graphics.OverviewScrim;
 import com.android.launcher3.statemanager.StateManager;
 import com.android.launcher3.states.StateAnimationConfig;
 import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
 import com.android.launcher3.util.VibratorWrapper;
-import com.android.quickstep.util.StaggeredWorkspaceAnim;
+import com.android.quickstep.util.AnimatorControllerWithResistance;
+import com.android.quickstep.util.OverviewToHomeAnim;
 import com.android.quickstep.views.RecentsView;

 /**
@@ -62,10 +60,10 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo

    private boolean mDidTouchStartInNavBar;
    private boolean mReachedOverview;
-    private boolean mIsOverviewRehidden;
-    private boolean mIsHomeStaggeredAnimFinished;
    // The last recorded displacement before we reached overview.
    private PointF mStartDisplacement = new PointF();
+    private float mStartY;
+    private AnimatorPlaybackController mOverviewResistYAnim;

    // Normal to Hint animation has flag SKIP_OVERVIEW, so we update this scrim with this animator.
    private ObjectAnimator mNormalToHintOverviewScrimAnimator;
@@ -123,6 +121,7 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
                    mToState.getOverviewScrimAlpha(mLauncher));
        }
        mReachedOverview = false;
+        mOverviewResistYAnim = null;
    }

    @Override
@@ -160,6 +159,9 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
        mNormalToHintOverviewScrimAnimator = null;
        mCurrentAnimation.dispatchOnCancelWithoutCancelRunnable(() -> {
            mLauncher.getStateManager().goToState(OVERVIEW, true, () -> {
+                mOverviewResistYAnim = AnimatorControllerWithResistance
+                        .createRecentsResistanceFromOverviewAnim(mLauncher, null)
+                        .createPlaybackController();
                mReachedOverview = true;
                maybeSwipeInteractionToOverviewComplete();
            });
@@ -173,13 +175,6 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
        }
    }

-    // Used if flinging back to home after reaching overview
-    private void maybeSwipeInteractionToHomeComplete() {
-        if (mIsHomeStaggeredAnimFinished && mIsOverviewRehidden) {
-            onSwipeInteractionCompleted(NORMAL, Touch.FLING);
-        }
-    }
-
    @Override
    protected boolean handlingOverviewAnim() {
        return mDidTouchStartInNavBar && super.handlingOverviewAnim();
@@ -193,11 +188,17 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
        if (mMotionPauseDetector.isPaused()) {
            if (!mReachedOverview) {
                mStartDisplacement.set(xDisplacement, yDisplacement);
+                mStartY = event.getY();
            } else {
                mRecentsView.setTranslationX((xDisplacement - mStartDisplacement.x)
                        * OVERVIEW_MOVEMENT_FACTOR);
-                mRecentsView.setTranslationY((yDisplacement - mStartDisplacement.y)
-                        * OVERVIEW_MOVEMENT_FACTOR);
+                float yProgress = (mStartDisplacement.y - yDisplacement) / mStartY;
+                if (yProgress > 0 && mOverviewResistYAnim != null) {
+                    mOverviewResistYAnim.setPlayFraction(yProgress);
+                } else {
+                    mRecentsView.setTranslationY((yDisplacement - mStartDisplacement.y)
+                            * OVERVIEW_MOVEMENT_FACTOR);
+                }
            }
            // Stay in Overview.
            return true;
@@ -212,35 +213,8 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
        StateManager<LauncherState> stateManager = mLauncher.getStateManager();
        boolean goToHomeInsteadOfOverview = isFling;
        if (goToHomeInsteadOfOverview) {
-            if (velocity > 0) {
-                stateManager.goToState(NORMAL, true,
-                        () -> onSwipeInteractionCompleted(NORMAL, Touch.FLING));
-            } else {
-                mIsHomeStaggeredAnimFinished = mIsOverviewRehidden = false;
-
-                StaggeredWorkspaceAnim staggeredWorkspaceAnim = new StaggeredWorkspaceAnim(
-                        mLauncher, velocity, false /* animateOverviewScrim */);
-                staggeredWorkspaceAnim.addAnimatorListener(new AnimationSuccessListener() {
-                    @Override
-                    public void onAnimationSuccess(Animator animator) {
-                        mIsHomeStaggeredAnimFinished = true;
-                        maybeSwipeInteractionToHomeComplete();
-                    }
-                }).start();
-
-                // StaggeredWorkspaceAnim doesn't animate overview, so we handle it here.
-                stateManager.cancelAnimation();
-                StateAnimationConfig config = new StateAnimationConfig();
-                config.duration = OVERVIEW.getTransitionDuration(mLauncher);
-                config.animFlags = PLAY_ATOMIC_OVERVIEW_PEEK;
-                AnimatorSet anim = stateManager.createAtomicAnimation(
-                        stateManager.getState(), NORMAL, config);
-                anim.addListener(AnimationSuccessListener.forRunnable(() -> {
-                    mIsOverviewRehidden = true;
-                    maybeSwipeInteractionToHomeComplete();
-                }));
-                anim.start();
-            }
+            new OverviewToHomeAnim(mLauncher, ()-> onSwipeInteractionCompleted(NORMAL, Touch.FLING))
+                    .animateWithVelocity(velocity);
        }
        if (mReachedOverview) {
            float distanceDp = dpiFromPx(Math.max(
@@ -256,6 +230,13 @@ public class NoButtonNavbarToOverviewTouchController extends FlingAndHoldTouchCo
                    .withEndAction(goToHomeInsteadOfOverview
                            ? null
                            : this::maybeSwipeInteractionToOverviewComplete);
+            if (!goToHomeInsteadOfOverview) {
+                // Return to normal properties for the overview state.
+                StateAnimationConfig config = new StateAnimationConfig();
+                config.duration = duration;
+                LauncherState state = mLauncher.getStateManager().getState();
+                mLauncher.getStateManager().createAtomicAnimation(state, state, config).start();
+            }
        }
    }

@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.quickstep.util;
+
+import static com.android.launcher3.LauncherState.NORMAL;
+import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.launcher3.anim.Interpolators.DEACCEL;
+import static com.android.launcher3.anim.Interpolators.FINAL_FRAME;
+import static com.android.launcher3.anim.Interpolators.INSTANT;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_ALL_COMPONENTS;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_OVERVIEW_ACTIONS_FADE;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_OVERVIEW_SCALE;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_OVERVIEW_TRANSLATE_X;
+import static com.android.launcher3.states.StateAnimationConfig.ANIM_OVERVIEW_TRANSLATE_Y;
+import static com.android.launcher3.states.StateAnimationConfig.PLAY_ATOMIC_OVERVIEW_PEEK;
+
+import android.animation.Animator;
+import android.animation.AnimatorSet;
+import android.util.Log;
+import android.view.animation.Interpolator;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherState;
+import com.android.launcher3.anim.AnimationSuccessListener;
+import com.android.launcher3.statemanager.StateManager;
+import com.android.launcher3.states.StateAnimationConfig;
+import com.android.quickstep.views.RecentsView;
+
+/**
+ * Runs an animation from overview to home. Currently, this animation is just a wrapper around the
+ * normal state transition, in order to keep RecentsView at the same scale and translationY that
+ * it started out at as it translates offscreen. It also scrolls RecentsView to page 0 and may play
+ * a {@link StaggeredWorkspaceAnim} if we're starting from an upward fling.
+ */
+public class OverviewToHomeAnim {
+
+    private static final String TAG = "OverviewToHomeAnim";
+
+    // Constants to specify how to scroll RecentsView to the default page if it's not already there.
+    private static final int DEFAULT_PAGE = 0;
+    private static final int PER_PAGE_SCROLL_DURATION = 150;
+    private static final int MAX_PAGE_SCROLL_DURATION = 750;
+
+    private final Launcher mLauncher;
+    private final Runnable mOnReachedHome;
+
+    // Only run mOnReachedHome when both of these are true.
+    private boolean mIsHomeStaggeredAnimFinished;
+    private boolean mIsOverviewHidden;
+
+    public OverviewToHomeAnim(Launcher launcher, Runnable onReachedHome) {
+        mLauncher = launcher;
+        mOnReachedHome = onReachedHome;
+    }
+
+    /**
+     * Starts the animation. If velocity < 0 (i.e. upwards), also plays a
+     * {@link StaggeredWorkspaceAnim}.
+     */
+    public void animateWithVelocity(float velocity) {
+        StateManager<LauncherState> stateManager = mLauncher.getStateManager();
+        LauncherState startState = stateManager.getState();
+        if (startState != OVERVIEW) {
+            Log.e(TAG, "animateFromOverviewToHome: unexpected start state " + startState);
+        }
+
+        boolean playStaggeredWorkspaceAnim = velocity < 0;
+        if (playStaggeredWorkspaceAnim) {
+            StaggeredWorkspaceAnim staggeredWorkspaceAnim = new StaggeredWorkspaceAnim(
+                    mLauncher, velocity, false /* animateOverviewScrim */);
+            staggeredWorkspaceAnim.addAnimatorListener(new AnimationSuccessListener() {
+                @Override
+                public void onAnimationSuccess(Animator animator) {
+                    mIsHomeStaggeredAnimFinished = true;
+                    maybeOverviewToHomeAnimComplete();
+                }
+            }).start();
+        } else {
+            mIsHomeStaggeredAnimFinished = true;
+        }
+
+        RecentsView recentsView = mLauncher.getOverviewPanel();
+        int numPagesToScroll = recentsView.getNextPage() - DEFAULT_PAGE;
+        int scrollDuration = Math.min(MAX_PAGE_SCROLL_DURATION,
+                numPagesToScroll * PER_PAGE_SCROLL_DURATION);
+        int duration = Math.max(scrollDuration, startState.getTransitionDuration(mLauncher));
+
+        StateAnimationConfig config = new UseFirstInterpolatorStateAnimConfig();
+        config.duration = duration;
+        config.animFlags = playStaggeredWorkspaceAnim
+                // StaggeredWorkspaceAnim doesn't animate overview, so we handle it here.
+                ? PLAY_ATOMIC_OVERVIEW_PEEK
+                : ANIM_ALL_COMPONENTS;
+        config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_X, DEACCEL);
+        config.setInterpolator(ANIM_OVERVIEW_TRANSLATE_Y, FINAL_FRAME);
+        config.setInterpolator(ANIM_OVERVIEW_SCALE, FINAL_FRAME);
+        config.setInterpolator(ANIM_OVERVIEW_ACTIONS_FADE, INSTANT);
+        AnimatorSet anim = stateManager.createAtomicAnimation(
+                startState, NORMAL, config);
+        anim.addListener(new AnimationSuccessListener() {
+            @Override
+            public void onAnimationSuccess(Animator animator) {
+                mIsOverviewHidden = true;
+                maybeOverviewToHomeAnimComplete();
+            }
+        });
+        stateManager.cancelAnimation();
+        anim.start();
+        recentsView.snapToPage(DEFAULT_PAGE, duration);
+    }
+
+    private void maybeOverviewToHomeAnimComplete() {
+        if (mIsHomeStaggeredAnimFinished && mIsOverviewHidden) {
+            mOnReachedHome.run();
+        }
+    }
+
+    /**
+     * Wrapper around StateAnimationConfig that doesn't allow interpolators to be set if they are
+     * already set. This ensures they aren't overridden before being used.
+     */
+    private static class UseFirstInterpolatorStateAnimConfig extends StateAnimationConfig {
+        @Override
+        public void setInterpolator(int animId, Interpolator interpolator) {
+            if (mInterpolators[animId] == null || interpolator == null) {
+                super.setInterpolator(animId, interpolator);
+            }
+        }
+    }
+}
@@ -105,6 +105,7 @@ public class OverviewActionsView<T extends OverlayUICallbacks> extends FrameLayo
    public OverviewActionsView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr, 0);
        mMultiValueAlpha = new MultiValueAlpha(this, 4);
+        mMultiValueAlpha.setUpdateVisibility(true);
    }

    @Override
@@ -168,7 +169,6 @@ public class OverviewActionsView<T extends OverlayUICallbacks> extends FrameLayo
        }
        boolean isHidden = mHiddenFlags != 0;
        mMultiValueAlpha.getProperty(INDEX_HIDDEN_FLAGS_ALPHA).setValue(isHidden ? 0 : 1);
-        setVisibility(isHidden ? INVISIBLE : VISIBLE);
    }

    /**
@@ -18,6 +18,8 @@ package com.android.quickstep.util;
 import static com.android.launcher3.anim.Interpolators.DEACCEL;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 import static com.android.quickstep.SysUINavigationMode.Mode.TWO_BUTTONS;
+import static com.android.quickstep.views.RecentsView.RECENTS_SCALE_PROPERTY;
+import static com.android.quickstep.views.RecentsView.TASK_SECONDARY_TRANSLATION;

 import android.animation.TimeInterpolator;
 import android.content.Context;
@@ -27,12 +29,16 @@ import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.FloatProperty;

+import androidx.annotation.Nullable;
+
+import com.android.launcher3.BaseDraggingActivity;
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.PendingAnimation;
 import com.android.quickstep.LauncherActivityInterface;
 import com.android.quickstep.SysUINavigationMode;
+import com.android.quickstep.views.RecentsView;

 /**
 * Controls an animation that can go beyond progress = 1, at which point resistance should be
@@ -48,15 +54,32 @@ public class AnimatorControllerWithResistance {
     */
    public static final float TWO_BUTTON_EXTRA_DRAG_FACTOR = 0.25f;

-    /**
-     * Start slowing down the rate of scaling down when recents view is smaller than this scale.
-     */
-    private static final float RECENTS_SCALE_START_RESIST = 0.75f;
+    private enum RecentsParams {
+        FROM_APP(0.75f, 0.5f, 1f),
+        FROM_OVERVIEW(1f, 0.75f, 0.5f);

-    /**
-     * Recents view will reach this scale at the very end of the drag.
-     */
-    private static final float RECENTS_SCALE_MAX_RESIST = 0.5f;
+        RecentsParams(float scaleStartResist, float scaleMaxResist, float translationFactor) {
+            this.scaleStartResist = scaleStartResist;
+            this.scaleMaxResist = scaleMaxResist;
+            this.translationFactor = translationFactor;
+        }
+
+        /**
+         * Start slowing down the rate of scaling down when recents view is smaller than this scale.
+         */
+        public final float scaleStartResist;
+
+        /**
+         * Recents view will reach this scale at the very end of the drag.
+         */
+        public final float scaleMaxResist;
+
+        /**
+         * How much translation to apply to RecentsView when the drag reaches the top of the screen,
+         * where 0 will keep it centered and 1 will have it barely touch the top of the screen.
+         */
+        public final float translationFactor;
+    }

    private static final TimeInterpolator RECENTS_SCALE_RESIST_INTERPOLATOR = DEACCEL;
    private static final TimeInterpolator RECENTS_TRANSLATE_RESIST_INTERPOLATOR = LINEAR;
@@ -115,6 +138,24 @@ public class AnimatorControllerWithResistance {
            RecentsOrientedState recentsOrientedState, DeviceProfile dp, SCALE scaleTarget,
            FloatProperty<SCALE> scaleProperty, TRANSLATION translationTarget,
            FloatProperty<TRANSLATION> translationProperty) {
+
+        PendingAnimation resistAnim = createRecentsResistanceAnim(null, context,
+                recentsOrientedState, dp, scaleTarget, scaleProperty, translationTarget,
+                translationProperty, RecentsParams.FROM_APP);
+
+        AnimatorPlaybackController resistanceController = resistAnim.createPlaybackController();
+        return new AnimatorControllerWithResistance(normalController, resistanceController);
+    }
+
+    /**
+     * Creates the resistance animation for {@link #createForRecents}, or can be used separately
+     * when starting from recents, i.e. {@link #createRecentsResistanceFromOverviewAnim}.
+     */
+    public static <SCALE, TRANSLATION> PendingAnimation createRecentsResistanceAnim(
+            @Nullable PendingAnimation resistAnim, Context context,
+            RecentsOrientedState recentsOrientedState, DeviceProfile dp, SCALE scaleTarget,
+            FloatProperty<SCALE> scaleProperty, TRANSLATION translationTarget,
+            FloatProperty<TRANSLATION> translationProperty, RecentsParams params) {
        Rect startRect = new Rect();
        LauncherActivityInterface.INSTANCE.calculateTaskSize(context, dp, startRect,
                recentsOrientedState.getOrientationHandler());
@@ -125,7 +166,9 @@ public class AnimatorControllerWithResistance {
            distanceToCover = (long)
                    ((dp.heightPx - startRect.bottom) * TWO_BUTTON_EXTRA_DRAG_FACTOR);
        }
-        PendingAnimation resistAnim = new PendingAnimation(distanceToCover * 2);
+        if (resistAnim == null) {
+            resistAnim = new PendingAnimation(distanceToCover * 2);
+        }

        PointF pivot = new PointF();
        float fullscreenScale = recentsOrientedState.getFullScreenScaleAndPivot(
@@ -141,9 +184,9 @@ public class AnimatorControllerWithResistance {
        } else {
            // Create an interpolator that resists the scale so the scale doesn't get smaller than
            // RECENTS_SCALE_MAX_RESIST.
-            float startResist = Utilities.getProgress(RECENTS_SCALE_START_RESIST, startScale,
+            float startResist = Utilities.getProgress(params.scaleStartResist , startScale,
                    endScale);
-            float maxResist = Utilities.getProgress(RECENTS_SCALE_MAX_RESIST, startScale, endScale);
+            float maxResist = Utilities.getProgress(params.scaleMaxResist, startScale, endScale);
            scaleInterpolator = t -> {
                if (t < startResist) {
                    return t;
@@ -160,17 +203,28 @@ public class AnimatorControllerWithResistance {
            // Compute where the task view would be based on the end scale, if we didn't translate.
            RectF endRectF = new RectF(startRect);
            Matrix temp = new Matrix();
-            temp.setScale(RECENTS_SCALE_MAX_RESIST, RECENTS_SCALE_MAX_RESIST, pivot.x, pivot.y);
+            temp.setScale(params.scaleMaxResist, params.scaleMaxResist, pivot.x, pivot.y);
            temp.mapRect(endRectF);
            // Translate such that the task view touches the top of the screen when drag does.
            float endTranslation = endRectF.top * recentsOrientedState.getOrientationHandler()
-                    .getSecondaryTranslationDirectionFactor();
+                    .getSecondaryTranslationDirectionFactor() * params.translationFactor;
            resistAnim.addFloat(translationTarget, translationProperty, 0, endTranslation,
                    RECENTS_TRANSLATE_RESIST_INTERPOLATOR);
        }

-        AnimatorPlaybackController resistanceController = resistAnim.createPlaybackController();
-        return new AnimatorControllerWithResistance(normalController, resistanceController);
+        return resistAnim;
    }

+    /**
+     * Helper method to update or create a PendingAnimation suitable for animating
+     * a RecentsView interaction that started from the overview state.
+     */
+    public static PendingAnimation createRecentsResistanceFromOverviewAnim(
+            BaseDraggingActivity activity, @Nullable PendingAnimation resistanceAnim) {
+        RecentsView recentsView = activity.getOverviewPanel();
+        return createRecentsResistanceAnim(resistanceAnim, activity,
+                recentsView.getPagedViewOrientedState(), activity.getDeviceProfile(),
+                recentsView, RECENTS_SCALE_PROPERTY, recentsView, TASK_SECONDARY_TRANSLATION,
+                RecentsParams.FROM_OVERVIEW);
+    }
 }
@@ -71,6 +71,7 @@ public class StateAnimationConfig {
            ANIM_ALL_APPS_HEADER_FADE,
            ANIM_OVERVIEW_MODAL,
            ANIM_DEPTH,
+            ANIM_OVERVIEW_ACTIONS_FADE,
    })
    @Retention(RetentionPolicy.SOURCE)
    public @interface AnimType {}
@@ -89,10 +90,11 @@ public class StateAnimationConfig {
    public static final int ANIM_ALL_APPS_HEADER_FADE = 12; // e.g. predictions
    public static final int ANIM_OVERVIEW_MODAL = 13;
    public static final int ANIM_DEPTH = 14;
+    public static final int ANIM_OVERVIEW_ACTIONS_FADE = 15;

-    private static final int ANIM_TYPES_COUNT = 15;
+    private static final int ANIM_TYPES_COUNT = 16;

-    private final Interpolator[] mInterpolators = new Interpolator[ANIM_TYPES_COUNT];
+    protected final Interpolator[] mInterpolators = new Interpolator[ANIM_TYPES_COUNT];

    public StateAnimationConfig() { }

@@ -19,6 +19,8 @@ package com.android.launcher3.util;
 import android.util.FloatProperty;
 import android.view.View;

+import com.android.launcher3.anim.AlphaUpdateListener;
+
 import java.util.Arrays;

 /**
@@ -44,6 +46,8 @@ public class MultiValueAlpha {
    private final AlphaProperty[] mMyProperties;

    private int mValidMask;
+    // Whether we should change from INVISIBLE to VISIBLE and vice versa at low alpha values.
+    private boolean mUpdateVisibility;

    public MultiValueAlpha(View view, int size) {
        mView = view;
@@ -66,6 +70,11 @@ public class MultiValueAlpha {
        return mMyProperties[index];
    }

+    /** Sets whether we should update between INVISIBLE and VISIBLE based on alpha. */
+    public void setUpdateVisibility(boolean updateVisibility) {
+        mUpdateVisibility = updateVisibility;
+    }
+
    public class AlphaProperty {

        private final int mMyMask;
@@ -99,6 +108,9 @@ public class MultiValueAlpha {
            mValue = value;

            mView.setAlpha(mOthers * mValue);
+            if (mUpdateVisibility) {
+                AlphaUpdateListener.updateVisibility(mView);
+            }
        }

        public float getValue() {