poller 1.1.3

A custom poller for Flutter apps to use to periodically poll for information.

example/main.dart

import 'package:flutter/material.dart';
import 'package:poller/poller.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Poller Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Poller Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  Poller _poller;

  @override
  void initState() {
    super.initState();
    _poller = new Poller(
      seconds: 1,
      callback: () {
        setState(() {
          _counter += 1;
        });
      },
      logging: true,
    );
  }

  bool _canStart() {
    return _poller.isStopped;
  }

  bool _canStop() {
    return !_poller.isStopped;
  }

  bool _canPause() {
    return !_poller.isStopped && !_poller.isPaused;
  }

  bool _canResume() {
    return !_poller.isStopped && _poller.isPaused;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'Poller has executed this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: RaisedButton(
                    child: Text('Start'),
                    onPressed: _canStart()
                        ? () {
                            setState(() {
                              _poller.start();
                            });
                          }
                        : null,
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: RaisedButton(
                    child: Text('Stop'),
                    onPressed: _canStop()
                        ? () {
                            setState(() {
                              _poller.stop();
                            });
                          }
                        : null,
                  ),
                ),
              ],
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: RaisedButton(
                    child: Text('Pause'),
                    onPressed: _canPause()
                        ? () {
                            setState(() {
                              _poller.pause();
                            });
                          }
                        : null,
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: RaisedButton(
                    child: Text('Resume'),
                    onPressed: _canResume()
                        ? () {
                            setState(() {
                              _poller.resume();
                            });
                          }
                        : null,
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}