Avoid runtime error when placed inside TabBarView (#410)

4 years ago · 6400ba1df5
parent 1956f68806
commit 6400ba1df5
1 changed files with 2 additions and 0 deletions
--- a/lib/src/widgets/toolbar/arrow_indicated_button_list.dart
+++ b/lib/src/widgets/toolbar/arrow_indicated_button_list.dart
@ -60,6 +60,8 @@ class _ArrowIndicatedButtonListState extends State<ArrowIndicatedButtonList>
  }

  void _handleScroll() {
+    if (!mounted) return;
+
    setState(() {
      _showLeftArrow =
          _controller.position.minScrollExtent != _controller.position.pixels;