stateful_builder_controller 0.1.0

control setState for StatefulWidget locally, cache value/widget with property

example/lib/main.dart

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

void main() {
  runApp(MyApp());
}

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

  final countSetterController = SetterController();

  int _counter = 0;

  void _incrementCounter() {
    // update count locally
    countSetterController.update(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:2',
            ),
            StatefulBuilder1<Widget>(
                builder: (context, setter, value) {
                  // when call countSetterController.update, only reload here
                  return Column(
                    children: [
                      value,
                      Text(
                        '$_counter',
                        style: Theme.of(context).textTheme.headline4,
                      ),
                    ],
                  );
                },
                controller: countSetterController,
                value: Container(
                  width: 50,
                  height: 50,
                  color: Colors.red,
                ),
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }
}