Your First Flutter App: An App From Scratch

Feb 22 2022 · Dart 2.14.1, Flutter 2.5, Visual Studio Code 1.6

Part 2: Understand Flutter Widgets

15. Understand Widget State

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A key part of programming is state. Rather than start with the computer science definition of state, let’s go with something that might be a little more familiar: the dashboard of a car.

class _GamePageState extends State<GamePage> {
  bool _alertIsVisible = false;

var _alertIsVisible = false;

TextButton(
  child:
      const Text('Hit Me!', style: TextStyle(color: Colors.blue)),
  onPressed: () {
    _alertIsVisible = true;
  },
),

void _showAlert(BuildContext context) {

}

  var okButton = TextButton(
    child: const Text('Awesome!'),
    onPressed: () {
      Navigator.of(context).pop();
      _alertIsVisible = false;
      print('Awesome pressed! $_alertIsVisible');
    },
  );

showDialog(
  context: context,
  builder: (BuildContext context) {
    return AlertDialog(
      title: const Text('Hello there!'),
      content: const Text('This is my first pop-up.'),
      actions: [
        okButton,
      ],
      elevation: 5,
    );
  },
);

onPressed: () {
  _alertIsVisible = true;
  _showAlert(context);
},