Merge "Convert TaskViewTouchController to Kotlin." into main

quickstep/src/com/android/launcher3/uioverrides/QuickstepLauncher.java

@@ -23,6 +23,7 @@ import static android.window.DesktopModeFlags.ENABLE_DESKTOP_WINDOWING_WALLPAPER
 
 import static com.android.app.animation.Interpolators.EMPHASIZED;
 import static com.android.internal.jank.Cuj.CUJ_LAUNCHER_LAUNCH_APP_PAIR_FROM_WORKSPACE;
+import static com.android.launcher3.Flags.enableExpressiveDismissTaskMotion;
 import static com.android.launcher3.Flags.enableUnfoldStateAnimation;
 import static com.android.launcher3.LauncherConstants.SavedInstanceKeys.PENDING_SPLIT_SELECT_INFO;
 import static com.android.launcher3.LauncherConstants.SavedInstanceKeys.RUNTIME_STATE;
@@ -149,7 +150,9 @@ import com.android.launcher3.uioverrides.touchcontrollers.NoButtonQuickSwitchTou
 import com.android.launcher3.uioverrides.touchcontrollers.PortraitStatesTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.QuickSwitchTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.StatusBarTouchController;
+import com.android.launcher3.uioverrides.touchcontrollers.TaskViewRecentsTouchContext;
 import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchController;
+import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchControllerDeprecated;
 import com.android.launcher3.uioverrides.touchcontrollers.TransposedQuickSwitchTouchController;
 import com.android.launcher3.uioverrides.touchcontrollers.TwoButtonNavbarTouchController;
 import com.android.launcher3.util.ActivityOptionsWrapper;
@@ -265,6 +268,25 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
 
     private final OverviewChangeListener mOverviewChangeListener = this::onOverviewTargetChanged;
 
+    private final TaskViewRecentsTouchContext mTaskViewRecentsTouchContext =
+            new TaskViewRecentsTouchContext() {
+                @Override
+                public boolean isRecentsInteractive() {
+                    return isInState(OVERVIEW) || isInState(OVERVIEW_MODAL_TASK);
+                }
+
+                @Override
+                public boolean isRecentsModal() {
+                    return isInState(OVERVIEW_MODAL_TASK);
+                }
+
+                @Override
+                public void onUserControlledAnimationCreated(
+                        AnimatorPlaybackController animController) {
+                    getStateManager().setCurrentUserControlledAnimation(animController);
+                }
+            };
+
     public static QuickstepLauncher getLauncher(Context context) {
         return fromContext(context);
     }
@@ -665,7 +687,11 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
             list.add(new StatusBarTouchController(this));
         }
 
-        list.add(new LauncherTaskViewController(this));
+        if (enableExpressiveDismissTaskMotion()) {
+            list.add(new TaskViewTouchController<>(this, mTaskViewRecentsTouchContext));
+        } else {
+            list.add(new TaskViewTouchControllerDeprecated<>(this, mTaskViewRecentsTouchContext));
+        }
         return list.toArray(new TouchController[list.size()]);
     }
 
@@ -1442,29 +1468,6 @@ public class QuickstepLauncher extends Launcher implements RecentsViewContainer,
         mBubbleBarLocation = bubbleBarLocation;
     }
 
-    private static final class LauncherTaskViewController extends
-            TaskViewTouchController<QuickstepLauncher> {
-
-        LauncherTaskViewController(QuickstepLauncher activity) {
-            super(activity);
-        }
-
-        @Override
-        protected boolean isRecentsInteractive() {
-            return mContainer.isInState(OVERVIEW) || mContainer.isInState(OVERVIEW_MODAL_TASK);
-        }
-
-        @Override
-        protected boolean isRecentsModal() {
-            return mContainer.isInState(OVERVIEW_MODAL_TASK);
-        }
-
-        @Override
-        protected void onUserControlledAnimationCreated(AnimatorPlaybackController animController) {
-            mContainer.getStateManager().setCurrentUserControlledAnimation(animController);
-        }
-    }
-
     @Override
     public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
         super.dump(prefix, fd, writer, args);

quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/TaskViewRecentsTouchContext.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2025 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.launcher3.uioverrides.touchcontrollers;
+
+import com.android.launcher3.anim.AnimatorPlaybackController;
+
+/** Interface providing context about the RecentsView state to a {@link TaskViewTouchController}. */
+public interface TaskViewRecentsTouchContext {
+    /** Returns whether Recents is interactive for touch. */
+    boolean isRecentsInteractive();
+
+    /** Returns if Recents is showing a single task in a modal way. */
+    boolean isRecentsModal();
+
+    /** Runs when a user controlled animation is created. */
+    default void onUserControlledAnimationCreated(AnimatorPlaybackController animController) {
+    }
+}

quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/TaskViewTouchController.kt

@@ -0,0 +1,394 @@
+/*
+ * Copyright (C) 2025 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.launcher3.uioverrides.touchcontrollers
+
+import android.animation.Animator
+import android.animation.AnimatorListenerAdapter
+import android.content.Context
+import android.graphics.Rect
+import android.os.VibrationEffect
+import android.view.MotionEvent
+import android.view.animation.Interpolator
+import com.android.app.animation.Interpolators
+import com.android.launcher3.AbstractFloatingView
+import com.android.launcher3.LauncherAnimUtils.SUCCESS_TRANSITION_PROGRESS
+import com.android.launcher3.LauncherAnimUtils.blockedFlingDurationFactor
+import com.android.launcher3.R
+import com.android.launcher3.Utilities
+import com.android.launcher3.anim.AnimatorPlaybackController
+import com.android.launcher3.anim.PendingAnimation
+import com.android.launcher3.touch.BaseSwipeDetector
+import com.android.launcher3.touch.SingleAxisSwipeDetector
+import com.android.launcher3.util.DisplayController
+import com.android.launcher3.util.FlingBlockCheck
+import com.android.launcher3.util.TouchController
+import com.android.launcher3.util.VibratorWrapper
+import com.android.quickstep.util.VibrationConstants
+import com.android.quickstep.views.RecentsView
+import com.android.quickstep.views.RecentsViewContainer
+import com.android.quickstep.views.TaskView
+import kotlin.math.abs
+
+/** Touch controller for handling task view card swipes */
+class TaskViewTouchController<CONTAINER>(
+    private val container: CONTAINER,
+    private val taskViewRecentsTouchContext: TaskViewRecentsTouchContext,
+) : AnimatorListenerAdapter(), TouchController, SingleAxisSwipeDetector.Listener where
+CONTAINER : Context,
+CONTAINER : RecentsViewContainer {
+    private val recentsView: RecentsView<*, *> = container.getOverviewPanel()
+    private val detector: SingleAxisSwipeDetector =
+        SingleAxisSwipeDetector(
+            container as Context,
+            this,
+            recentsView.pagedOrientationHandler.upDownSwipeDirection,
+        )
+    private val tempRect = Rect()
+    private val isRtl = Utilities.isRtl(container.resources)
+    private val flingBlockCheck = FlingBlockCheck()
+
+    private var currentAnimation: AnimatorPlaybackController? = null
+    private var currentAnimationIsGoingUp = false
+    private var allowGoingUp = false
+    private var allowGoingDown = false
+    private var noIntercept = false
+    private var displacementShift = 0f
+    private var progressMultiplier = 0f
+    private var endDisplacement = 0f
+    private var draggingEnabled = true
+    private var overrideVelocity: Float? = null
+    private var taskBeingDragged: TaskView? = null
+    private var isDismissHapticRunning = false
+
+    private fun canInterceptTouch(ev: MotionEvent): Boolean {
+        val currentAnimation = currentAnimation
+        return when {
+            (ev.edgeFlags and Utilities.EDGE_NAV_BAR) != 0 -> {
+                // Don't intercept swipes on the nav bar, as user might be trying to go home
+                // during a task dismiss animation.
+                currentAnimation?.animationPlayer?.end()
+                false
+            }
+            currentAnimation != null -> {
+                currentAnimation.forceFinishIfCloseToEnd()
+                true
+            }
+            AbstractFloatingView.getTopOpenViewWithType(
+                container,
+                AbstractFloatingView.TYPE_TOUCH_CONTROLLER_NO_INTERCEPT,
+            ) != null -> false
+            else -> taskViewRecentsTouchContext.isRecentsInteractive
+        }
+    }
+
+    override fun onAnimationCancel(animation: Animator) {
+        if (animation === currentAnimation?.target) {
+            clearState()
+        }
+    }
+
+    override fun onControllerInterceptTouchEvent(ev: MotionEvent): Boolean {
+        if (
+            (ev.action == MotionEvent.ACTION_UP || ev.action == MotionEvent.ACTION_CANCEL) &&
+                currentAnimation == null
+        ) {
+            clearState()
+        }
+        if (ev.action == MotionEvent.ACTION_DOWN) {
+            // Disable swiping up and down if the task overlay is modal.
+            if (taskViewRecentsTouchContext.isRecentsModal) {
+                noIntercept = true
+                return false
+            }
+            noIntercept = !canInterceptTouch(ev)
+            if (noIntercept) {
+                return false
+            }
+            // Now figure out which direction scroll events the controller will start
+            // calling the callbacks.
+            var directionsToDetectScroll = 0
+            var ignoreSlopWhenSettling = false
+            if (currentAnimation != null) {
+                directionsToDetectScroll = SingleAxisSwipeDetector.DIRECTION_BOTH
+                ignoreSlopWhenSettling = true
+            } else {
+                taskBeingDragged = null
+                recentsView.taskViews.forEach { taskView ->
+                    if (
+                        recentsView.isTaskViewVisible(taskView) &&
+                            container.dragLayer.isEventOverView(taskView, ev)
+                    ) {
+                        taskBeingDragged = taskView
+                        val upDirection = recentsView.pagedOrientationHandler.getUpDirection(isRtl)
+
+                        // The task can be dragged up to dismiss it
+                        allowGoingUp = true
+
+                        // The task can be dragged down to open it if:
+                        // - It's the current page
+                        // - We support gestures to enter overview
+                        // - It's the focused task if in grid view
+                        // - The task is snapped
+                        allowGoingDown =
+                            taskView === recentsView.currentPageTaskView &&
+                                DisplayController.getNavigationMode(container).hasGestures &&
+                                (!recentsView.showAsGrid() || taskView.isLargeTile) &&
+                                recentsView.isTaskInExpectedScrollPosition(taskView)
+
+                        directionsToDetectScroll =
+                            if (allowGoingDown) SingleAxisSwipeDetector.DIRECTION_BOTH
+                            else upDirection
+                        return@forEach
+                    }
+                }
+                if (taskBeingDragged == null) {
+                    noIntercept = true
+                    return false
+                }
+            }
+            detector.setDetectableScrollConditions(directionsToDetectScroll, ignoreSlopWhenSettling)
+        }
+        if (noIntercept) {
+            return false
+        }
+        onControllerTouchEvent(ev)
+        return detector.isDraggingOrSettling
+    }
+
+    override fun onControllerTouchEvent(ev: MotionEvent): Boolean = detector.onTouchEvent(ev)
+
+    private fun reInitAnimationController(goingUp: Boolean) {
+        if (currentAnimation != null && currentAnimationIsGoingUp == goingUp) {
+            // No need to init
+            return
+        }
+        if ((goingUp && !allowGoingUp) || (!goingUp && !allowGoingDown)) {
+            // Trying to re-init in an unsupported direction.
+            return
+        }
+        val taskBeingDragged = taskBeingDragged ?: return
+        currentAnimation?.setPlayFraction(0f)
+        currentAnimation?.target?.removeListener(this)
+        currentAnimation?.dispatchOnCancel()
+
+        val orientationHandler = recentsView.pagedOrientationHandler
+        currentAnimationIsGoingUp = goingUp
+        val dl = container.dragLayer
+        val secondaryLayerDimension = orientationHandler.getSecondaryDimension(dl)
+        val maxDuration = 2L * secondaryLayerDimension
+        val verticalFactor = orientationHandler.getTaskDragDisplacementFactor(isRtl)
+        val secondaryTaskDimension = orientationHandler.getSecondaryDimension(taskBeingDragged)
+        // The interpolator controlling the most prominent visual movement. We use this to determine
+        // whether we passed SUCCESS_TRANSITION_PROGRESS.
+        val currentInterpolator: Interpolator
+        val pa: PendingAnimation
+        if (goingUp) {
+            currentInterpolator = Interpolators.LINEAR
+            pa = PendingAnimation(maxDuration)
+            recentsView.createTaskDismissAnimation(
+                pa,
+                taskBeingDragged,
+                true, /* animateTaskView */
+                true, /* removeTask */
+                maxDuration,
+                false, /* dismissingForSplitSelection*/
+            )
+
+            endDisplacement = -secondaryTaskDimension.toFloat()
+        } else {
+            currentInterpolator = Interpolators.ZOOM_IN
+            pa =
+                recentsView.createTaskLaunchAnimation(
+                    taskBeingDragged,
+                    maxDuration,
+                    currentInterpolator,
+                )
+
+            // Since the thumbnail is what is filling the screen, based the end displacement on it.
+            taskBeingDragged.getThumbnailBounds(tempRect, /* relativeToDragLayer= */ true)
+            endDisplacement = (secondaryLayerDimension - tempRect.bottom).toFloat()
+        }
+        endDisplacement *= verticalFactor.toFloat()
+        currentAnimation =
+            pa.createPlaybackController().apply {
+                // Setting this interpolator doesn't affect the visual motion, but is used to
+                // determine whether we successfully reached the target state in onDragEnd().
+                target.interpolator = currentInterpolator
+                taskViewRecentsTouchContext.onUserControlledAnimationCreated(this)
+                target.addListener(this@TaskViewTouchController)
+                dispatchOnStart()
+            }
+        progressMultiplier = 1 / endDisplacement
+    }
+
+    override fun onDragStart(start: Boolean, startDisplacement: Float) {
+        if (!draggingEnabled) return
+        val currentAnimation = currentAnimation
+
+        val orientationHandler = recentsView.pagedOrientationHandler
+        if (currentAnimation == null) {
+            reInitAnimationController(orientationHandler.isGoingUp(startDisplacement, isRtl))
+            displacementShift = 0f
+        } else {
+            displacementShift = currentAnimation.progressFraction / progressMultiplier
+            currentAnimation.pause()
+        }
+        flingBlockCheck.unblockFling()
+        overrideVelocity = null
+    }
+
+    override fun onDrag(displacement: Float): Boolean {
+        if (!draggingEnabled) return true
+        val taskBeingDragged = taskBeingDragged ?: return true
+        val currentAnimation = currentAnimation ?: return true
+
+        val orientationHandler = recentsView.pagedOrientationHandler
+        val totalDisplacement = displacement + displacementShift
+        val isGoingUp =
+            if (totalDisplacement == 0f) currentAnimationIsGoingUp
+            else orientationHandler.isGoingUp(totalDisplacement, isRtl)
+        if (isGoingUp != currentAnimationIsGoingUp) {
+            reInitAnimationController(isGoingUp)
+            flingBlockCheck.blockFling()
+        } else {
+            flingBlockCheck.onEvent()
+        }
+
+        if (isGoingUp) {
+            if (currentAnimation.progressFraction < ANIMATION_PROGRESS_FRACTION_MIDPOINT) {
+                // Halve the value when dismissing, as we are animating the drag across the full
+                // length for only the first half of the progress
+                currentAnimation.setPlayFraction(
+                    Utilities.boundToRange(totalDisplacement * progressMultiplier / 2, 0f, 1f)
+                )
+            } else {
+                // Set mOverrideVelocity to control task dismiss velocity in onDragEnd
+                var velocityDimenId = R.dimen.default_task_dismiss_drag_velocity
+                if (recentsView.showAsGrid()) {
+                    velocityDimenId =
+                        if (taskBeingDragged.isLargeTile) {
+                            R.dimen.default_task_dismiss_drag_velocity_grid_focus_task
+                        } else {
+                            R.dimen.default_task_dismiss_drag_velocity_grid
+                        }
+                }
+                overrideVelocity = -taskBeingDragged.resources.getDimension(velocityDimenId)
+
+                // Once halfway through task dismissal interpolation, switch from reversible
+                // dragging-task animation to playing the remaining task translation animations,
+                // while this is in progress disable dragging.
+                draggingEnabled = false
+            }
+        } else {
+            currentAnimation.setPlayFraction(
+                Utilities.boundToRange(totalDisplacement * progressMultiplier, 0f, 1f)
+            )
+        }
+
+        return true
+    }
+
+    override fun onDragEnd(velocity: Float) {
+        val taskBeingDragged = taskBeingDragged ?: return
+        val currentAnimation = currentAnimation ?: return
+
+        // Limit velocity, as very large scalar values make animations play too quickly
+        val maxTaskDismissDragVelocity =
+            taskBeingDragged.resources.getDimension(R.dimen.max_task_dismiss_drag_velocity)
+        val endVelocity =
+            Utilities.boundToRange(
+                overrideVelocity ?: velocity,
+                -maxTaskDismissDragVelocity,
+                maxTaskDismissDragVelocity,
+            )
+        overrideVelocity = null
+
+        var fling = draggingEnabled && detector.isFling(endVelocity)
+        val goingToEnd: Boolean
+        val blockedFling = fling && flingBlockCheck.isBlocked
+        if (blockedFling) {
+            fling = false
+        }
+        val orientationHandler = recentsView.pagedOrientationHandler
+        val goingUp = orientationHandler.isGoingUp(endVelocity, isRtl)
+        val progress = currentAnimation.progressFraction
+        val interpolatedProgress = currentAnimation.interpolatedProgress
+        goingToEnd =
+            if (fling) {
+                goingUp == currentAnimationIsGoingUp
+            } else {
+                interpolatedProgress > SUCCESS_TRANSITION_PROGRESS
+            }
+        var animationDuration =
+            BaseSwipeDetector.calculateDuration(
+                endVelocity,
+                if (goingToEnd) (1 - progress) else progress,
+            )
+        if (blockedFling && !goingToEnd) {
+            animationDuration *= blockedFlingDurationFactor(endVelocity).toLong()
+        }
+        // Due to very high or low velocity dismissals, animation durations can be inconsistently
+        // long or short. Bound the duration for animation of task translations for a more
+        // standardized feel.
+        animationDuration =
+            Utilities.boundToRange(
+                animationDuration,
+                MIN_TASK_DISMISS_ANIMATION_DURATION,
+                MAX_TASK_DISMISS_ANIMATION_DURATION,
+            )
+
+        currentAnimation.setEndAction { this.clearState() }
+        currentAnimation.startWithVelocity(
+            container,
+            goingToEnd,
+            abs(endVelocity.toDouble()).toFloat(),
+            endDisplacement,
+            animationDuration,
+        )
+        if (goingUp && goingToEnd && !isDismissHapticRunning) {
+            VibratorWrapper.INSTANCE.get(container)
+                .vibrate(
+                    TASK_DISMISS_VIBRATION_PRIMITIVE,
+                    TASK_DISMISS_VIBRATION_PRIMITIVE_SCALE,
+                    TASK_DISMISS_VIBRATION_FALLBACK,
+                )
+            isDismissHapticRunning = true
+        }
+
+        draggingEnabled = true
+    }
+
+    private fun clearState() {
+        detector.finishedScrolling()
+        detector.setDetectableScrollConditions(0, false)
+        draggingEnabled = true
+        taskBeingDragged = null
+        currentAnimation = null
+        isDismissHapticRunning = false
+    }
+
+    companion object {
+        private const val ANIMATION_PROGRESS_FRACTION_MIDPOINT = 0.5f
+        private const val MIN_TASK_DISMISS_ANIMATION_DURATION: Long = 300
+        private const val MAX_TASK_DISMISS_ANIMATION_DURATION: Long = 600
+
+        private const val TASK_DISMISS_VIBRATION_PRIMITIVE: Int =
+            VibrationEffect.Composition.PRIMITIVE_TICK
+        private const val TASK_DISMISS_VIBRATION_PRIMITIVE_SCALE: Float = 1f
+        private val TASK_DISMISS_VIBRATION_FALLBACK: VibrationEffect =
+            VibrationConstants.EFFECT_TEXTURE_TICK
+    }
+}

quickstep/src/com/android/launcher3/uioverrides/touchcontrollers/TaskViewTouchControllerDeprecated.java

@@ -49,10 +49,13 @@ import com.android.quickstep.views.TaskView;
 
 /**
  * Touch controller for handling task view card swipes
+ *
+ * @deprecated This class will be replaced by the new {@link TaskViewTouchController}.
  */
-public abstract class TaskViewTouchController<CONTAINER extends Context & RecentsViewContainer>
-        extends AnimatorListenerAdapter implements TouchController,
-        SingleAxisSwipeDetector.Listener {
+@Deprecated
+public class TaskViewTouchControllerDeprecated<
+        CONTAINER extends Context & RecentsViewContainer> extends AnimatorListenerAdapter
+        implements TouchController, SingleAxisSwipeDetector.Listener {
 
     private static final float ANIMATION_PROGRESS_FRACTION_MIDPOINT = 0.5f;
     private static final long MIN_TASK_DISMISS_ANIMATION_DURATION = 300;
@@ -65,6 +68,7 @@ public abstract class TaskViewTouchController<CONTAINER extends Context & Recent
             VibrationConstants.EFFECT_TEXTURE_TICK;
 
     protected final CONTAINER mContainer;
+    private final TaskViewRecentsTouchContext mTaskViewRecentsTouchContext;
     private final SingleAxisSwipeDetector mDetector;
     private final RecentsView<?, ?> mRecentsView;
     private final Rect mTempRect = new Rect();
@@ -88,8 +92,10 @@ public abstract class TaskViewTouchController<CONTAINER extends Context & Recent
 
     private boolean mIsDismissHapticRunning = false;
 
-    public TaskViewTouchController(CONTAINER container) {
+    public TaskViewTouchControllerDeprecated(CONTAINER container,
+            TaskViewRecentsTouchContext taskViewRecentsTouchContext) {
         mContainer = container;
+        mTaskViewRecentsTouchContext = taskViewRecentsTouchContext;
         mRecentsView = container.getOverviewPanel();
         mIsRtl = Utilities.isRtl(container.getResources());
         SingleAxisSwipeDetector.Direction dir =
@@ -117,15 +123,7 @@ public abstract class TaskViewTouchController<CONTAINER extends Context & Recent
                 mContainer, TYPE_TOUCH_CONTROLLER_NO_INTERCEPT) != null) {
             return false;
         }
-        return isRecentsInteractive();
-    }
-
-    protected abstract boolean isRecentsInteractive();
-
-    /** Is recents view showing a single task in a modal way. */
-    protected abstract boolean isRecentsModal();
-
-    protected void onUserControlledAnimationCreated(AnimatorPlaybackController animController) {
+        return mTaskViewRecentsTouchContext.isRecentsInteractive();
     }
 
     @Override
@@ -161,7 +159,7 @@ public abstract class TaskViewTouchController<CONTAINER extends Context & Recent
                     if (mRecentsView.isTaskViewVisible(taskView) && mContainer.getDragLayer()
                             .isEventOverView(taskView, ev)) {
                         // Disable swiping up and down if the task overlay is modal.
-                        if (isRecentsModal()) {
+                        if (mTaskViewRecentsTouchContext.isRecentsModal()) {
                             mTaskBeingDragged = null;
                             break;
                         }
@@ -259,7 +257,7 @@ public abstract class TaskViewTouchController<CONTAINER extends Context & Recent
         // Setting this interpolator doesn't affect the visual motion, but is used to determine
         // whether we successfully reached the target state in onDragEnd().
         mCurrentAnimation.getTarget().setInterpolator(currentInterpolator);
-        onUserControlledAnimationCreated(mCurrentAnimation);
+        mTaskViewRecentsTouchContext.onUserControlledAnimationCreated(mCurrentAnimation);
         mCurrentAnimation.getTarget().addListener(this);
         mCurrentAnimation.dispatchOnStart();
         mProgressMultiplier = 1 / mEndDisplacement;

quickstep/src/com/android/quickstep/fallback/RecentsDragLayer.java

@@ -15,9 +15,15 @@
  */
 package com.android.quickstep.fallback;
 
+import static com.android.launcher3.Flags.enableExpressiveDismissTaskMotion;
+
 import android.content.Context;
 import android.util.AttributeSet;
 
+import com.android.launcher3.statemanager.StatefulContainer;
+import com.android.launcher3.uioverrides.touchcontrollers.TaskViewRecentsTouchContext;
+import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchController;
+import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchControllerDeprecated;
 import com.android.launcher3.util.TouchController;
 import com.android.launcher3.views.BaseDragLayer;
 import com.android.quickstep.views.RecentsViewContainer;
@@ -25,16 +31,33 @@ import com.android.quickstep.views.RecentsViewContainer;
 /**
  * Drag layer for fallback recents activity
  */
-public class RecentsDragLayer<T extends Context & RecentsViewContainer> extends BaseDragLayer<T> {
+public class RecentsDragLayer<T extends Context & RecentsViewContainer
+        & StatefulContainer<RecentsState>> extends BaseDragLayer<T> {
+
+    private final TaskViewRecentsTouchContext mTaskViewRecentsTouchContext =
+            new TaskViewRecentsTouchContext() {
+                @Override
+                public boolean isRecentsInteractive() {
+                    return mContainer.getRootView().hasWindowFocus()
+                            || mContainer.getStateManager().getState().hasLiveTile();
+                }
+
+                @Override
+                public boolean isRecentsModal() {
+                    return false;
+                }
+            };
+
     public RecentsDragLayer(Context context, AttributeSet attrs) {
         super(context, attrs, 1 /* alphaChannelCount */);
     }
 
     @Override
     public void recreateControllers() {
-        mControllers = new TouchController[] {
-                new RecentsTaskController(mContainer),
-                new FallbackNavBarTouchController(mContainer),
-        };
+        mControllers = new TouchController[]{
+                enableExpressiveDismissTaskMotion() ? new TaskViewTouchController<>(mContainer,
+                        mTaskViewRecentsTouchContext) : new TaskViewTouchControllerDeprecated<>(
+                        mContainer, mTaskViewRecentsTouchContext),
+                new FallbackNavBarTouchController(mContainer)};
     }
 }

quickstep/src/com/android/quickstep/fallback/RecentsTaskController.java

@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2018 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.fallback;
-
-import android.content.Context;
-
-import com.android.launcher3.statemanager.StatefulContainer;
-import com.android.launcher3.uioverrides.touchcontrollers.TaskViewTouchController;
-import com.android.quickstep.views.RecentsViewContainer;
-
-public class RecentsTaskController<T extends Context & RecentsViewContainer &
-        StatefulContainer<RecentsState>> extends TaskViewTouchController<T> {
-    public RecentsTaskController(T container) {
-        super(container);
-    }
-
-    @Override
-    protected boolean isRecentsInteractive() {
-        return mContainer.getRootView().hasWindowFocus()
-                || mContainer.getStateManager().getState().hasLiveTile();
-    }
-
-    @Override
-    protected boolean isRecentsModal() {
-        return false;
-    }
-}