Update slider.dart

MattyBoy4444 · Jun 6, 2022 · d8ef37a · d8ef37a
1 parent 9bde9b5
commit d8ef37a
Showing 1 changed file with 9 additions and 1 deletion.
diff --git a/charts_flutter/example/lib/behaviors/slider.dart b/charts_flutter/example/lib/behaviors/slider.dart
@@ -119,7 +119,7 @@ class _SliderCallbackState extends State<SliderLine> {
       });
     }
 
-    SchedulerBinding.instance.addPostFrameCallback(rebuild);
+    _ambiguate(SchedulerBinding.instance)!.addPostFrameCallback(rebuild);
   }
 
   @override
@@ -194,3 +194,11 @@ class LinearSales {
 
   LinearSales(this.year, this.sales);
 }
+
+/// This allows a value of type T or T?
+/// to be treated as a value of type T?.
+///
+/// We use this so that APIs that have become
+/// non-nullable can still be used with `!` and `?`
+/// to support older versions of the API as well.
+T? _ambiguate<T>(T? value) => value;