From c6ea2d404023ca1a92cb95eb3f177579df1c2d28 Mon Sep 17 00:00:00 2001
From: rightnao <rightnao@google.com>
Date: Thu, 24 Aug 2023 22:28:22 +0000
Subject: [PATCH] [Carousel] Update vertical scroll speed to be faster

PiperOrigin-RevId: 559888221
---
 .../android/material/carousel/CarouselSnapHelper.java  | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/java/com/google/android/material/carousel/CarouselSnapHelper.java b/lib/java/com/google/android/material/carousel/CarouselSnapHelper.java
index b5a75e65616..eda7662a4f1 100644
--- a/lib/java/com/google/android/material/carousel/CarouselSnapHelper.java
+++ b/lib/java/com/google/android/material/carousel/CarouselSnapHelper.java
@@ -34,6 +34,10 @@
  */
 public class CarouselSnapHelper extends SnapHelper {
 
+  private static final float HORIZONTAL_SNAP_SPEED = 100F;
+
+  private static final float VERTICAL_SNAP_SPEED = 50F;
+
   private final boolean disableFling;
   private RecyclerView recyclerView;
 
@@ -245,7 +249,11 @@ protected void onTargetFound(
 
           @Override
           protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
-            return 100.0F / (float) displayMetrics.densityDpi;
+            // If the carousel orientation is vertical, we want the scroll speed to be faster.
+            if (layoutManager.canScrollVertically()) {
+              return VERTICAL_SNAP_SPEED / (float) displayMetrics.densityDpi;
+            }
+            return HORIZONTAL_SNAP_SPEED / (float) displayMetrics.densityDpi;
           }
         }
         : null;