Stop scrolling and trigger layout request when item changes affect th…

…e layout structure
rubensousa · Jul 8, 2024 · 7243741 · 7243741
1 parent a33c8d6
commit 7243741
Showing 1 changed file with 23 additions and 0 deletions.
diff --git a/...lerview/src/main/java/com/rubensousa/dpadrecyclerview/layoutmanager/layout/PivotLayout.kt b/...lerview/src/main/java/com/rubensousa/dpadrecyclerview/layoutmanager/layout/PivotLayout.kt
@@ -231,17 +231,40 @@ internal class PivotLayout(
     fun onItemsAdded(positionStart: Int, itemCount: Int) {
         itemChanges.insertionPosition = positionStart
         itemChanges.insertionItemCount = itemCount
+        onItemsChanged()
     }
 
     fun onItemsRemoved(positionStart: Int, itemCount: Int) {
         itemChanges.removalPosition = positionStart
         itemChanges.removalItemCount = itemCount
+        onItemsChanged()
     }
 
     fun onItemsMoved(from: Int, to: Int, itemCount: Int) {
         itemChanges.moveFromPosition = from
         itemChanges.moveToPosition = to
         itemChanges.moveItemCount = itemCount
+        onItemsChanged()
+    }
+
+    private fun onItemsChanged() {
+        if (!layoutInfo.isScrolling) {
+            return
+        }
+        val firstPos = layoutInfo.findFirstAddedPosition()
+        val lastPos = layoutInfo.findLastAddedPosition()
+        val changesOutOfBounds = if (!layoutInfo.shouldReverseLayout()) {
+            itemChanges.isOutOfBounds(firstPos, lastPos)
+        } else {
+            itemChanges.isOutOfBounds(lastPos, firstPos)
+        }
+        if (changesOutOfBounds) {
+            return
+        }
+        layoutInfo.getRecyclerView()?.apply {
+            stopScroll()
+            requestLayout()
+        }
     }
 
     fun setOnChildLaidOutListener(listener: OnChildLaidOutListener?) {