【Flutter】跟着flutter教程学着写了一个简单的Demo

import ‘package:flutter/material.dart‘;
import ‘package:english_words/english_words.dart‘;

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // final wordPair = new WordPair.random();
    return new MaterialApp(
      title: ‘Startup Name Generator‘,
      theme: new ThemeData(
        primaryColor: Colors.white,
      ),
      home: new RandomWords(),
    );
  }
}

class RandomWords extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return new RandomWordsState();
  }

}

class RandomWordsState extends State<RandomWords> {
  final _suggestions = <WordPair>[];

  final _biggerFont = const TextStyle(fontSize: 18);

  final _saved = new Set<WordPair>();

  @override
  Widget build(BuildContext context) {
    //final wordPair = new WordPair.random();
    //return new Text(wordPair.asPascalCase);
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(‘Startup Name Generator‘),
        actions: <Widget>[
          new IconButton(icon: new Icon(Icons.list), onPressed: _pushSaved),
        ],
      ),
      body: _buildSuggestions(),
    );
  }

  void _pushSaved(){
    Navigator.of(context).push(
      new MaterialPageRoute(builder: (context){
        final tiles = _saved.map((pair){
              return new ListTile(
                title: new Text(
                  pair.asPascalCase,
                  style: _biggerFont,
                ),
              );
            }
        );
        final divided = ListTile.divideTiles(
          context: context,
          tiles: tiles,
        ).toList();

        return new Scaffold(
          appBar: new AppBar(
            title: new Text(‘Saved Suggestions‘),
          ),
          body: new ListView(children: divided),
        );
      })
    );
  }

  Widget _buildSuggestions(){
    return new ListView.builder(
      padding: const EdgeInsets.all(16.0),
      itemBuilder: (context, i) {
        if (i.isOdd) return new Divider();
        final index = i ~/2;
        if (index >= _suggestions.length) {
          _suggestions.addAll(generateWordPairs().take(10));
        }

        return _buildRow(_suggestions[index]);
      },
    );
  }

  Widget _buildRow(WordPair pair) {
    final alreadySaved = _saved.contains(pair);
    return new ListTile(
      title: new Text(
        pair.asPascalCase,
        style: _biggerFont,
      ),
      trailing: new Icon(
        alreadySaved ? Icons.favorite : Icons.favorite_border,
        color: alreadySaved ? Colors.green : null,
      ),
      onTap: (){
        setState(() {
          if (alreadySaved) {
            _saved.remove(pair);
          } else {
            _saved.add(pair);
          }
        });
      },
    );
  }

}