main2.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Startup Name Generator',
      theme: ThemeData(
        primaryColor: Colors.red,
      ),
      home: RandomWords(),
    );
  }
}

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

class _RandomWordsState extends State<RandomWords> {
  @override
  Widget build(BuildContext context) {
    void _pushSaved() {
      Navigator.of(context).push(
        MaterialPageRoute<void>(
          builder: (BuildContext context) {
            final tiles = _saved.map(
              (WordPair pair) {
                return ListTile(
                  title: Text(
                    pair.asPascalCase,
                    style: _biggerFont,
                  ),
                );
              },
            );
            final divided = ListTile.divideTiles(
              context: context,
              tiles: tiles,
            ).toList();

            return Scaffold(
              appBar: AppBar(
                title: Text('SomethingSomthing'),
              ),
              body: ListView(children: divided),
            );
          }, // ...to here.
        ),
      );
    }

    return Scaffold(
      // Add from here...
      appBar: AppBar(
        title: Text('Startup Name Generator'),
        actions: [IconButton(icon: Icon(Icons.list), onPressed: _pushSaved)],
      ),
      body: _buildSuggestions(),
    );
  }

  final _saved = Set<WordPair>();
  final List<WordPair> _suggestions = <WordPair>[]; // NEW
  final TextStyle _biggerFont = const TextStyle(fontSize: 18); // NEW

  Widget _buildSuggestions() {
    return ListView.builder(
        padding: const EdgeInsets.all(16),
        // The itemBuilder callback is called once per suggested
        // word pairing, and places each suggestion into a ListTile
        // row. For even rows, the function adds a ListTile row for
        // the word pairing. For odd rows, the function adds a
        // Divider widget to visually separate the entries. Note that
        // the divider may be difficult to see on smaller devices.
        itemBuilder: (BuildContext _context, int i) {
          // Add a one-pixel-high divider widget before each row
          // in the ListView.
          if (i.isOdd) {
            return Divider();
          }

          // The syntax "i ~/ 2" divides i by 2 and returns an
          // integer result.
          // For example: 1, 2, 3, 4, 5 becomes 0, 1, 1, 2, 2.
          // This calculates the actual number of word pairings
          // in the ListView,minus the divider widgets.
          final int index = i ~/ 2;
          // If you've reached the end of the available word
          // pairings...
          if (index >= _suggestions.length) {
            // ...then generate 10 more and add them to the
            // suggestions list.
            _suggestions.addAll(generateWordPairs().take(10));
          }
          return _buildRow(_suggestions[index]);
        });
  }

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

class Hello extends StatefulWidget {
  @override
  _HelloState createState() => _HelloState();
}

class _HelloState extends State<Hello> {
  @override
  Widget build(BuildContext context) {
    return Text("Hello WORLD");
  }
}