Hide Clear all button during quick switch

- Add support for mMinScrollX to PagedView
- Add RECENTS_CLEAR_ALL_BUTTON as a state-specified visible element
- In BackgroundAppState, set Clear all invisible and bound RecentsView
  scroll to the last task

Test:
- Open an app, quick switch until reaching the end, ensure Clear all
  does not show up and an overscroll effect is performed
- Enter overview, scroll to the end and ensure Clear all shows up
- Same tests in RTL and 3rd party launcher

Bug: 130160876
Change-Id: I5fb958744d0055b83ced1f8b0d7face0e06a0cc5

1 files changed, 8 insertions, 5 deletions

diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
index 21e98f260..f12efc83c 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/FallbackActivityControllerHelper.java
@@ -26,11 +26,13 @@ import android.content.Context;
 import android.graphics.Rect;
 import android.graphics.RectF;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.userevent.nano.LauncherLogProto;
-import com.android.launcher3.util.MultiValueAlpha.AlphaProperty;
 import com.android.quickstep.util.LayoutUtils;
 import com.android.quickstep.util.RemoteAnimationTargetSet;
 import com.android.quickstep.views.RecentsView;
@@ -39,9 +41,6 @@ import com.android.systemui.shared.system.RemoteAnimationTargetCompat;
 import java.util.function.BiPredicate;
 import java.util.function.Consumer;
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-
 /**
  * {@link ActivityControlHelper} for recents when the default launcher is different than the
  * currently running one and apps should interact with the {@link RecentsActivity} as opposed
@@ -72,7 +71,9 @@ public final class FallbackActivityControllerHelper implements
 
     @Override
     public void onSwipeUpComplete(RecentsActivity activity) {
-        // TODO:
+        RecentsView recentsView = activity.getOverviewPanel();
+        recentsView.getClearAllButton().setVisibilityAlpha(1);
+        recentsView.setDisallowScrollToClearAll(false);
     }
 
     @Override
@@ -121,6 +122,8 @@ public final class FallbackActivityControllerHelper implements
 
         RecentsView rv = activity.getOverviewPanel();
         rv.setContentAlpha(0);
+        rv.getClearAllButton().setVisibilityAlpha(0);
+        rv.setDisallowScrollToClearAll(true);
 
         return new AnimationFactory() {