AdoptAWidget: MaterialBanner (#69530)

packages/flutter/lib/src/material/banner.dart

@@ -18,6 +18,30 @@ import 'theme.dart';
 /// They are persistent and non-modal, allowing the user to either ignore them or
 /// interact with them at any time.
 ///
+/// {@tool dartpad --template=stateless_widget_scaffold}
+///
+/// ```dart
+/// Widget build(BuildContext context) {
+///   return MaterialBanner(
+///     padding: const EdgeInsets.all(20),
+///     content: Text("Hey, I am an Material Banner"),
+///     leading: Icon(Icons.agriculture_outlined),
+///     backgroundColor: Colors.grey[300],
+///     actions: <Widget>[
+///       FlatButton(
+///         child: Text("OPEN"),
+///         onPressed: () {},
+///       ),
+///       FlatButton(
+///         child: Text("DISMISS"),
+///         onPressed: () {},
+///       ),
+///     ],
+///   );
+/// }
+/// ```
+/// {@end-tool}
+///
 /// The [actions] will be placed beside the [content] if there is only one.
 /// Otherwise, the [actions] will be placed below the [content]. Use
 /// [forceActionsBelow] to override this behavior.