flutterdartdelay

How to run code after some delay in Flutter?


I'd like to execute a function after a certain delay after my Widget is built. What's the idiomatic way of doing this in Flutter?

What I'm trying to achieve: I'd like to start with a default FlutterLogo Widget and then change its style property after some duration.


Solution

  • Figured it out 😎

    class AnimatedFlutterLogo extends StatefulWidget {
      @override
      State<StatefulWidget> createState() => new _AnimatedFlutterLogoState();
    }
    
    class _AnimatedFlutterLogoState extends State<AnimatedFlutterLogo> {
      Timer _timer;
      FlutterLogoStyle _logoStyle = FlutterLogoStyle.markOnly;
    
      _AnimatedFlutterLogoState() {
        _timer = new Timer(const Duration(milliseconds: 400), () {
          setState(() {
            _logoStyle = FlutterLogoStyle.horizontal;
          });
        });
      }
    
      @override
      void dispose() {
        super.dispose();
        _timer.cancel();
      }
    
      @override
      Widget build(BuildContext context) {
        return new FlutterLogo(
          size: 200.0,
          textColor: Palette.white,
          style: _logoStyle,
        );
      }
    }