overlay can't be the root overlay when persistent is false

[alizera]

I'm calling the sample showTopFlash() inside my app and get following error:

overlay can't be the root overlay when persistent is false
'package:flash/flash.dart':
Failed assertion: line 99 pos 14: 'overlay != rootOverlay'

This is my simple code to reproduce:

class _TestScreenState extends State<TestScreen> {
  int which = 0;

  @override
  Widget build(BuildContext context) {
    GlobalKey<ScaffoldState> _key = GlobalKey<ScaffoldState>();
    FlashHelper.init(context);
    return Scaffold(
      key: _key,
      body: Center(child: FlatButton(onPressed: (){
        _showTopFlash();
      }, child: Text('show Flash')),),
    );
  }
  void _showTopFlash({FlashStyle style = FlashStyle.floating}) {
    showFlash(
      context: context,
      duration: const Duration(seconds: 5),
      persistent: false,
      builder: (_, controller) {
        return Flash(
          controller: controller,
          backgroundColor: Colors.white,
          brightness: Brightness.light,
          boxShadows: [BoxShadow(blurRadius: 4)],
          barrierBlur: 3.0,
          barrierColor: Colors.black38,
          barrierDismissible: true,
          style: style,
          position: FlashPosition.bottom,
          child: FlashBar(
            title: Text('Title'),
            message: Text('Hello world!'),
            showProgressIndicator: true,
            primaryAction: FlatButton(
              onPressed: () => controller.dismiss(),
              child: Text('DISMISS', style: TextStyle(color: Colors.amber)),
            ),
          ),
        );
      },
    );
  }

}

When I set the persistent:true it works without Blur effect.
Thanks for your nice lib.

[sososdk]

Hi, @alizera
You need warp you TestScreen with Overlay. Please refer to the example

[fernando-s97]

Do I really need to wrap every single screen that uses Flash with an Overlay or there's a better alternative?

[sososdk]

@fernando-s97 When the persistent is false, you need warp the screen of the context with an Overlay