RangeError (RangeError (index): Invalid value) (#55)

--------- Co-authored-by: Dimitrios Begnis <dimitribegnis@gmail.com>
Dimibe · Sep 29, 2023 · 36f6c68 · 36f6c68
1 parent 0819d26
commit 36f6c68
Showing 1 changed file with 9 additions and 4 deletions.
diff --git a/lib/src/sticky_grouped_list.dart b/lib/src/sticky_grouped_list.dart
@@ -317,9 +317,14 @@ class StickyGroupedListViewState<T, E>
 
     int index = currentItem.index ~/ 2;
     if (_topElementIndex != index) {
-      E curr = widget.groupBy(sortedElements[index]);
-      E prev = widget.groupBy(sortedElements[_topElementIndex]);
-      if (prev != curr) {
+      if (_topElementIndex < sortedElements.length) {
+        E curr = widget.groupBy(sortedElements[index]);
+        E prev = widget.groupBy(sortedElements[_topElementIndex]);
+        if (prev != curr) {
+          _topElementIndex = index;
+          _streamController.add(_topElementIndex);
+        }
+      } else {
         _topElementIndex = index;
         _streamController.add(_topElementIndex);
       }
@@ -357,7 +362,7 @@ class StickyGroupedListViewState<T, E>
   }
 
   Widget _showFixedGroupHeader(int index) {
-    if (widget.elements.isNotEmpty) {
+    if (widget.elements.isNotEmpty && index < sortedElements.length) {
       _groupHeaderKey = GlobalKey();
       return Container(
         key: _groupHeaderKey,