Controlling State from outside of a StatefulWidget

Question

I\'m trying to understand the best practice for controlling a StatefulWidget\'s state outside of that Widgets State.

I have the following interface defined.

<

Answer 1

You can use eventify

This library provide mechanism to register for event notifications with emitter or publisher and get notified in the event of an event.

You can do something like:

// Import the library
import 'package:eventify/eventify.dart';
final EventEmitter emitter = new EventEmitter();

var controlNumber = 50;

List buttonsGenerator() {
    final List buttons = new List();
    for (var i = 0; i < controlNumber; i++) {
        widgets.add(new MaterialButton(
                  // Generate 10 Buttons afterwards
                  onPressed: () {
                    controlNumber = 10;
                    emitter.emit("updateButtonsList", null, "");
                  },
                );
    }
}

class AState extends State {
    @override
    Widget build(BuildContext context) {
        List buttons_list = buttonsGenerator();
        emitter.on('updateButtonsList', null, (event, event_context) {
            setState(() {
                buttons_list = buttonsGenerator();
            });
        });
    }
    ...
}

I can't think of anything which can't be achieved by event driven programming. You are limitless!

"Freedom cannot be bestowed — it must be achieved." - Elbert Hubbard