commit 454590d7ea6e2e4520f42f2baa91a86990925257
author Holly Sun <jiuyu@google.com> Mon Nov 27 13:39:38 2023 -0800
committer Holly Sun <jiuyu@google.com> Mon Nov 27 16:42:33 2023 -0800
tree c0e619fb6c3d52b57fe5d5a04b85c7ebe1da96aa
parent 2b352f6c5fe5e17dce3da63eaa7a1e27b98e385a

[PS] Add emphasized interpolators when clicking the PS tile to scroll to bottom.

UX spec: https://carbon.googleplex.com/google-material-3/pages/easing-and-duration/tokens-specs/bd8df608-11ee-48f9-b93d-90d74e3d35c8#5fa37127-0934-4c47-804e-cb2fbf47f73d. Use the first column "Emphasized" one.
Duration: 500ms

video: https://drive.google.com/file/d/1EYlkWVgiYFy0IB5WnQRVoQ9b_sbEkLj7/view?usp=sharing

Bug: 309522136
Test: manual
Flag: ACONFIG com.google.android.apps.nexuslauncher.inject_private_space_tile DEVELOPMENT
Change-Id: I178c075ebf5db8338f476d0607caabec7b8c7fde

src/com/android/launcher3/FastScrollRecyclerView.java

diff --git a/src/com/android/launcher3/FastScrollRecyclerView.java b/src/com/android/launcher3/FastScrollRecyclerView.java
index 01e65ae..a13dcc1 100644
--- a/src/com/android/launcher3/FastScrollRecyclerView.java
+++ b/src/com/android/launcher3/FastScrollRecyclerView.java
@@ -27,6 +27,7 @@
 import androidx.annotation.Nullable;
 import androidx.recyclerview.widget.RecyclerView;
 
+import com.android.app.animation.Interpolators;
 import com.android.launcher3.compat.AccessibilityManagerCompat;
 import com.android.launcher3.views.RecyclerViewFastScroller;
 
@@ -194,12 +195,13 @@
     }
 
     /**
-     * Scrolls this recycler view to the bottom.
+     * Scrolls this recycler view to the bottom with easing and duration.
      */
-    public void scrollToBottom() {
+    public void scrollToBottomWithMotion() {
         if (mScrollbar != null) {
             mScrollbar.reattachThumbToScroll();
         }
-        smoothScrollToPosition(getAdapter().getItemCount() - 1);
+        // Emphasized interpolators with 500ms duration
+        smoothScrollBy(0, getAvailableScrollHeight(), Interpolators.EMPHASIZED, 500);
     }
 }