preview 0.0.8

Create samples of your Flutter widgets and preview them in real time

example/lib/main.dart

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:preview/preview.dart';
import 'package:random_color/random_color.dart';
import 'package:preview_example/widgets/chip.dart' as c;

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Test',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page 5'),
      builder: previewAppBuilder,
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

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

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  List<Color> colors = List.generate(40,
      (index) => RandomColor().randomMaterialColor(colorHue: ColorHue.blue));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Preview ${Frame().runtimeType}'),
      ),
      body: Center(
        child: Scrollbar(
          child: SingleChildScrollView(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.all(20),
                  child: Wrap(
                      crossAxisAlignment: WrapCrossAlignment.center,
                      runAlignment: WrapAlignment.spaceBetween,
                      alignment: WrapAlignment.spaceBetween,
                      spacing: 10,
                      runSpacing: 10,
                      children: colors
                          .asMap()
                          .entries
                          .map((e) =>
                              c.Chip(title: 'Tag ${e.key}', color: e.value))
                          .toList()),
                ),
                Text(
                  'You have pushed the button this many times:',
                ),
                Text(
                  '$_counter',
                  style: Theme.of(context).textTheme.headline4,
                ),
              ],
            ),
          ),
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'aIncrement',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

class IPhoneX extends PreviewProvider {
  @override
  String get title => 'iPhone X';
  @override
  List<Preview> get previews => [
        Preview(
          key: Key('preview'),
          frame: Frames.iphoneX,
          child: MyApp(),
        ),
      ];
}

class IPad extends PreviewProvider {
  @override
  String get title => 'iPad  Pro';
  @override
  List<Preview> get previews => [
        Preview(
          frame: Frames.ipadPro12,
          child: MyApp(),
        ),
      ];
}

class AllPreview extends PreviewProvider {
  @override
  String get title => 'All';

  @override
  List<Preview> get previews => Frames.values
      .map(
        (e) => Preview(
          key: Key('preview'),
          frame: e,
          child: MyApp(),
        ),
      )
      .toList();
}