Quickly fade in QSB when swiping up when SWIPE_HOME = false

Now that the "hook" gesture is supported for old quickstep to switch
apps, we need to fade out the QSB so it doesn't overlap the TaskView we
are switching to.

Bug: 111926330
Change-Id: Ie04c7909f6b96d12c810b438db89eedf8ea5bdeb
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/BackgroundAppState.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/BackgroundAppState.java
index 963f1fa..fdb80da 100644
--- a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/BackgroundAppState.java
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/BackgroundAppState.java
@@ -20,6 +20,7 @@
 import android.os.RemoteException;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.allapps.AllAppsTransitionController;
+import com.android.launcher3.config.FeatureFlags;
 import com.android.quickstep.RecentsModel;
 import com.android.quickstep.util.LayoutUtils;
 import com.android.quickstep.views.RecentsView;
@@ -72,4 +73,13 @@
         float scale = (float) appWidth / sTempRect.width();
         return new float[] { scale, 0f };
     }
+
+    @Override
+    public int getVisibleElements(Launcher launcher) {
+        if (FeatureFlags.SWIPE_HOME.get()) {
+            return super.getVisibleElements(launcher);
+        }
+        // Hide shelf content (e.g. QSB) because we fade it in when swiping up.
+        return ALL_APPS_HEADER_EXTRA;
+    }
 }
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
index 9650a53..96f79a8 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/LauncherActivityControllerHelper.java
@@ -23,6 +23,7 @@
 import static com.android.launcher3.LauncherState.OVERVIEW;
 import static com.android.launcher3.allapps.AllAppsTransitionController.SPRING_DAMPING_RATIO;
 import static com.android.launcher3.allapps.AllAppsTransitionController.SPRING_STIFFNESS;
+import static com.android.launcher3.anim.Interpolators.DEACCEL_3;
 import static com.android.launcher3.anim.Interpolators.LINEAR;
 
 import android.animation.Animator;
@@ -38,13 +39,20 @@
 import android.view.View;
 import android.view.animation.Interpolator;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Launcher;
 import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.LauncherInitListener;
 import com.android.launcher3.LauncherState;
+import com.android.launcher3.LauncherStateManager;
+import com.android.launcher3.allapps.AllAppsTransitionController;
 import com.android.launcher3.allapps.DiscoveryBounce;
 import com.android.launcher3.anim.AnimatorPlaybackController;
+import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.SpringObjectAnimator;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.config.FeatureFlags;
@@ -61,10 +69,6 @@
 import java.util.function.BiPredicate;
 import java.util.function.Consumer;
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.annotation.UiThread;
-
 /**
  * {@link ActivityControlHelper} for the in-launcher recents.
  */
@@ -211,7 +215,7 @@
                         : mShelfState == ShelfAnimState.PEEK
                                 ? shelfPeekingProgress
                                 : shelfOverviewProgress;
-                mShelfAnim = createShelfAnim(activity, toProgress);
+                mShelfAnim = createShelfProgressAnim(activity, toProgress);
                 mShelfAnim.addListener(new AnimatorListenerAdapter() {
                     @Override
                     public void onAnimationEnd(Animator animation) {
@@ -229,10 +233,10 @@
             LauncherState fromState, long transitionLength,
             Consumer<AnimatorPlaybackController> callback) {
         LauncherState endState = OVERVIEW;
+        DeviceProfile dp = activity.getDeviceProfile();
+        long accuracy = 2 * Math.max(dp.widthPx, dp.heightPx);
         if (wasVisible && fromState != BACKGROUND_APP) {
             // If a translucent app was launched fom launcher, animate launcher states.
-            DeviceProfile dp = activity.getDeviceProfile();
-            long accuracy = 2 * Math.max(dp.widthPx, dp.heightPx);
             callback.accept(activity.getStateManager()
                     .createAnimationToNewWorkspace(fromState, endState, accuracy));
             return;
@@ -245,10 +249,11 @@
         if (!activity.getDeviceProfile().isVerticalBarLayout()
                 && !FeatureFlags.SWIPE_HOME.get()) {
             // Don't animate the shelf when SWIPE_HOME is true, because we update it atomically.
-            Animator shiftAnim = createShelfAnim(activity,
+            Animator shiftAnim = createShelfProgressAnim(activity,
                     fromState.getVerticalProgress(activity),
                     endState.getVerticalProgress(activity));
             anim.play(shiftAnim);
+            anim.play(createShelfAlphaAnim(activity, endState, accuracy));
         }
         playScaleDownAnim(anim, activity, endState);
 
@@ -265,7 +270,7 @@
         callback.accept(controller);
     }
 
-    private Animator createShelfAnim(Launcher activity, float ... progressValues) {
+    private Animator createShelfProgressAnim(Launcher activity, float ... progressValues) {
         Animator shiftAnim = new SpringObjectAnimator<>(activity.getAllAppsController(),
                 "allAppsSpringFromACH", activity.getAllAppsController().getShiftRange(),
                 SPRING_DAMPING_RATIO, SPRING_STIFFNESS, progressValues);
@@ -274,6 +279,19 @@
     }
 
     /**
+     * Very quickly fade the alpha of shelf content.
+     */
+    private Animator createShelfAlphaAnim(Launcher activity, LauncherState toState, long accuracy) {
+        AllAppsTransitionController allAppsController = activity.getAllAppsController();
+        AnimatorSetBuilder animBuilder = new AnimatorSetBuilder();
+        animBuilder.setInterpolator(AnimatorSetBuilder.ANIM_ALL_APPS_FADE, DEACCEL_3);
+        LauncherStateManager.AnimationConfig config = new LauncherStateManager.AnimationConfig();
+        config.duration = accuracy;
+        allAppsController.setAlphas(toState.getVisibleElements(activity), config, animBuilder);
+        return animBuilder.build();
+    }
+
+    /**
      * Scale down recents from the center task being full screen to being in overview.
      */
     private void playScaleDownAnim(AnimatorSet anim, Launcher launcher,
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 93bf69d..a4ecec7 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -188,9 +188,12 @@
 
     private void setAlphas(LauncherState toState, AnimationConfig config,
             AnimatorSetBuilder builder) {
+        setAlphas(toState.getVisibleElements(mLauncher), config, builder);
+    }
+
+    public void setAlphas(int visibleElements, AnimationConfig config, AnimatorSetBuilder builder) {
         PropertySetter setter = config == null ? NO_ANIM_PROPERTY_SETTER
                 : config.getPropertySetter(builder);
-        int visibleElements = toState.getVisibleElements(mLauncher);
         boolean hasHeaderExtra = (visibleElements & ALL_APPS_HEADER_EXTRA) != 0;
         boolean hasContent = (visibleElements & ALL_APPS_CONTENT) != 0;