Flutter call RFlutter Alert from another class - flutter

Question

I using flutter alert package rflutter_alert 1.1.0 , is it fine when writing the same code on same page. However due to many function making my code is too lengthy on 1 page.
So I try to split the alert function to another dart file, but I get the error of
A value of type 'Future<bool>' can't be returned from method 'build' because it has a return type of 'Widget'.dart(return_of_invalid_type)
if I write like this
dialog dart
import 'package:flutter/material.dart';
import 'package:rflutter_alert/rflutter_alert.dart';
class Dialog extends StatefulWidget {
#override
_DialogState createState() => _DialogState();
}
class _DialogState extends State<Dialog> {
#override
Widget build(BuildContext context) {
return Alert(
context: context,
type: AlertType.error,
title: "RFLUTTER ALERT",
desc: "Flutter testing Testing testing.",
buttons: [
DialogButton(
child: Text(
"COOL",
style: TextStyle(color: Colors.white, fontSize: 20),
),
onPressed: () => Navigator.pop(context),
width: 120,
)
],
).show();
}
}
What is correct way to split out the rFlutter alert code and call it when press the button ?

Answer 1

build need a Widget no ant Alert , in order to call the alert but the code inside click callback (Button for example).
#override
Widget build(BuildContext context) {
return Container(
child: FlatButton(onPressed: (){
Alert(
context: context,
type: AlertType.error,
title: "RFLUTTER ALERT",
desc: "Flutter testing Testing testing.",
buttons: [
DialogButton(
child: Text(
"COOL",
style: TextStyle(color: Colors.white, fontSize: 20),
),
onPressed: () => Navigator.pop(context),
width: 120,
)
],
).show();
}, child: Text("CLICK ME!!")),
);
}