consumer

main.dart

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // Builder takes three parameters 1. [BuildContext] which is our context
    // 2. [Object] it is the object and 3. it is optional [Widget] child
    return Consumer(
      builder: (context, Counter counter, _) => Scaffold(
            appBar: AppBar(
              title: Text("Provider Demo"),
            ),
            body: Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Text(
                    'You have pushed the button this many times:',
                  ),
                  Text(
                    '${counter.getCounter()}',
                    style: Theme.of(context).textTheme.display1,
                  ),
                ],
              ),
            ),
            floatingActionButton: Column(
              mainAxisAlignment: MainAxisAlignment.end,
              children: <Widget>[
                FloatingActionButton(
                  onPressed: counter.increment,
                  tooltip: 'Increment',
                  child: Icon(Icons.add),
                ),
                SizedBox(height: 10),
                FloatingActionButton(
                  onPressed: counter.decrement,
                  tooltip: 'Increment',
                  child: Icon(Icons.remove),
                )
              ],
            ),
          ),
    );
  }
}