Implement first tutorial of startup names

This commit is contained in:
Vishesh Handa
2018-05-13 07:38:17 +02:00
parent 321d42c77e
commit 27023eec84
3 changed files with 92 additions and 82 deletions

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@ -1,109 +1,110 @@
import 'package:flutter/material.dart'; import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';
void main() => runApp(new MyApp()); void main() => runApp(new MyApp());
class MyApp extends StatelessWidget { class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override @override
Widget build(BuildContext context) { Widget build(BuildContext context) {
return new MaterialApp( return new MaterialApp(
title: 'Flutter Demo', title: 'Startup Name Generator', home: new RandomWords());
theme: new ThemeData( }
// This is the theme of your application. }
//
// Try running your application with "flutter run". You'll see the class RandomWords extends StatefulWidget {
// application has a blue toolbar. Then, without quitting the app, try @override
// changing the primarySwatch below to Colors.green and then invoke createState() => new RandomWordsState();
// "hot reload" (press "r" in the console where you ran "flutter run", }
// or press Run > Flutter Hot Reload in IntelliJ). Notice that the
// counter didn't reset back to zero; the application is not restarted. class RandomWordsState extends State<RandomWords> {
primarySwatch: Colors.blue, final _suggestions = <WordPair>[];
), final _saved = new Set<WordPair>();
home: new MyHomePage(title: 'Flutter Demo Home Page'),
final _biggerFont = const TextStyle(fontSize: 18.0);
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]);
},
); );
} }
}
class MyHomePage extends StatefulWidget { Widget _buildRow(WordPair pair) {
MyHomePage({Key key, this.title}) : super(key: key); final alreadySaved = _saved.contains(pair);
// This widget is the home page of your application. It is stateful, meaning return new ListTile(
// that it has a State object (defined below) that contains fields that affect title: new Text(
// how it looks. pair.asPascalCase,
style: _biggerFont,
// 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 trailing: new Icon(
// used by the build method of the State. Fields in a Widget subclass are alreadySaved ? Icons.favorite : Icons.favorite_border,
// always marked "final". color: alreadySaved ? Colors.red : null,
),
final String title; onTap: () {
@override
_MyHomePageState createState() => new _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() { setState(() {
// This call to setState tells the Flutter framework that something has if (alreadySaved) {
// changed in this State, which causes it to rerun the build method below _saved.remove(pair);
// so that the display can reflect the updated values. If we changed } else {
// _counter without calling setState(), then the build method would not be _saved.add(pair);
// called again, and so nothing would appear to happen. }
_counter++;
}); });
},
);
} }
@override @override
Widget build(BuildContext context) { Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return new Scaffold( return new Scaffold(
appBar: new AppBar( appBar: new AppBar(
// Here we take the value from the MyHomePage object that was created by title: new Text('Startup Name Generator'),
// the App.build method, and use it to set our appbar title. actions: <Widget>[
title: new Text(widget.title), new IconButton(
), icon: new Icon(Icons.list),
body: new Center( onPressed: _pushSaved,
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: new Column(
// Column is also layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug paint" (press "p" in the console where you ran
// "flutter run", or select "Toggle Debug Paint" from the Flutter tool
// window in IntelliJ) to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
new Text(
'You have pushed the button this many times:',
),
new Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
), ),
], ],
), ),
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),
);
},
), ),
floatingActionButton: new FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: new Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
); );
} }
} }

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@ -85,6 +85,13 @@ packages:
url: "https://pub.dartlang.org" url: "https://pub.dartlang.org"
source: hosted source: hosted
version: "0.1.2" version: "0.1.2"
english_words:
dependency: "direct main"
description:
name: english_words
url: "https://pub.dartlang.org"
source: hosted
version: "3.1.0"
flutter: flutter:
dependency: "direct main" dependency: "direct main"
description: flutter description: flutter

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@ -8,6 +8,8 @@ dependencies:
# The following adds the Cupertino Icons font to your application. # The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons. # Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.0 cupertino_icons: ^0.1.0
english_words: ^3.1.0
dev_dependencies: dev_dependencies:
flutter_test: flutter_test: