Workaround a wrong fling direction if FlatList or VirtualizedList is …

…inverted.
facebook · Nov 13, 2018 · f9ed777 · f9ed777
1 parent a3752c6
commit f9ed777
Showing 1 changed file with 14 additions and 4 deletions.
diff --git a/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java b/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java
@@ -302,8 +302,18 @@ public void getClippingRect(Rect outClippingRect) {
 
   @Override
   public void fling(int velocityY) {
+    // Workaround.
+    // On Android P if a ScrollView is inverted, we will get a wrong sign for
+    // velocityY (see https://issuetracker.google.com/issues/112385925). 
+    // At the same time, mOnScrollDispatchHelper tracks the correct velocity direction. 
+    //
+    // Hence, we can use the absolute value from whatever the OS gives
+    // us and use the sign of what mOnScrollDispatchHelper has tracked.
+    final int correctedVelocityY = (int)(Math.abs(velocityY) * Math.signum(mOnScrollDispatchHelper.getYFlingVelocity()));
+
+
     if (mPagingEnabled) {
-      smoothScrollAndSnap(velocityY);
+      smoothScrollAndSnap(correctedVelocityY);
     } else if (mScroller != null) {
       // FB SCROLLVIEW CHANGE
 
@@ -319,7 +329,7 @@ public void fling(int velocityY) {
         getScrollX(), // startX
         getScrollY(), // startY
         0, // velocityX
-        velocityY, // velocityY
+        correctedVelocityY, // velocityY
         0, // minX
         0, // maxX
         0, // minY
@@ -332,9 +342,9 @@ public void fling(int velocityY) {
 
       // END FB SCROLLVIEW CHANGE
     } else {
-      super.fling(velocityY);
+      super.fling(correctedVelocityY);
     }
-    handlePostTouchScrolling(0, velocityY);
+    handlePostTouchScrolling(0, correctedVelocityY);
   }
 
   private void enableFpsListener() {