dependencies:
  flutter:
    sdk: flutter
  
  english_words: ^3.1.0

import ‘package:english_words/english_words.dart‘;

import ‘package:english_words/english_words.dart‘;
import ‘package:flutter/material.dart‘;
void main() => runApp(MyApp());

class RandomWords extends StatefulWidget{
  @override
  createState() => new RandomWordsState();
}

class MyApp extends StatelessWidget{
  @override 
  Widget build(BuildContext context){
    return new MaterialApp(
      title: "开始努力吧！~",
      theme: new ThemeData(
        primaryColor: Colors.blueAccent,
      ),
      home: new RandomWords(),
    );
  }
}

class RandomWordsState extends State<RandomWords>{
  final _suggestions=<WordPair>[];
  final _biggerFont=const TextStyle(fontSize: 18.0);
  final _saved=new Set<WordPair>();
  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.red:null,
      ),
      onTap: (){
        setState(() {
         if(alreadySaved){
           _saved.remove(pair);
         } else{
           _saved.add(pair);
         }
        });
      },
    );
  }
  @override 
  Widget build(BuildContext context){
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("挑一个你喜欢的名字叭~"),
        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),
          );
        },
      ),
    );
  }

}

lintOptions {
        //disable ‘InvalidPackage‘
        checkReleaseBuilds false
        abortOnError false
    }