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June 15, 2019 03:05
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flutter tutorial, Adding interactivity to your Flutter app
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import 'package:flutter/material.dart'; | |
void main() => runApp(MyApp()); | |
class MyApp extends StatelessWidget { | |
@override | |
Widget build(BuildContext context) { | |
Widget titleSection = Container( | |
padding: const EdgeInsets.all(32), | |
child: Row( | |
children: [ | |
Expanded( | |
child: Column( | |
crossAxisAlignment: CrossAxisAlignment.start, | |
children: [ | |
Container( | |
padding: const EdgeInsets.only(bottom: 8), | |
child: Text( | |
'Oeschinen Lake Campground', | |
style: TextStyle( | |
fontWeight: FontWeight.bold, | |
), | |
), | |
), | |
Text( | |
'Kandersteg, Switzerland', | |
style: TextStyle( | |
color: Colors.grey[500], | |
), | |
), | |
], | |
), | |
), | |
// Icon( | |
// Icons.star, | |
// color: Colors.red[500], | |
// ), | |
// Text('41'), | |
FavoriteWidget(), | |
], | |
), | |
); | |
Color color = Theme.of(context).primaryColor; | |
Widget buttonSection = Container( | |
child: Row( | |
mainAxisAlignment: MainAxisAlignment.spaceEvenly, | |
children: [ | |
_buildButtonColumn(color, Icons.call, 'CALL'), | |
_buildButtonColumn(color, Icons.near_me, 'ROUTE'), | |
_buildButtonColumn(color, Icons.share, 'SHARE'), | |
], | |
), | |
); | |
Widget textSection = Container( | |
padding: const EdgeInsets.all(32), | |
child: Text( | |
'Lake Oeschinen lies at the foot of the Blüemlisalp in the Bernese ' | |
'Alps. Situated 1,578 meters above sea level, it is one of the ' | |
'larger Alpine Lakes. A gondola ride from Kandersteg, followed by a ' | |
'half-hour walk through pastures and pine forest, leads you to the ' | |
'lake, which warms to 20 degrees Celsius in the summer. Activities ' | |
'enjoyed here include rowing, and riding the summer toboggan run.', | |
softWrap: true, | |
), | |
); | |
return MaterialApp( | |
title: 'Flutter layout demo', | |
home: Scaffold( | |
appBar: AppBar( | |
title: Text('Flutter layout demo'), | |
), | |
body: ListView( | |
children: [ | |
Image.asset( | |
'images/lake.jpg', | |
width: 600, | |
height: 240, | |
fit: BoxFit.cover, | |
), | |
titleSection, | |
buttonSection, | |
textSection, | |
] | |
) | |
), | |
); | |
} | |
Column _buildButtonColumn(Color color, IconData icon, String label) { | |
return Column( | |
mainAxisSize: MainAxisSize.min, | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: [ | |
Icon(icon, color: color), | |
Container( | |
margin: const EdgeInsets.only(top: 8), | |
child: Text( | |
label, | |
style: TextStyle( | |
fontSize: 12, | |
fontWeight: FontWeight.w400, | |
color: color, | |
), | |
), | |
), | |
], | |
); | |
} | |
} | |
class FavoriteWidget extends StatefulWidget { | |
@override | |
_FavoriteWidgetState createState() => _FavoriteWidgetState(); | |
} | |
class _FavoriteWidgetState extends State<FavoriteWidget> { | |
bool _isFavorited = true; | |
int _favoriteCount = 41; | |
void _toggleFavorite() { | |
setState(() { | |
if (_isFavorited) { | |
_favoriteCount -= 1; | |
_isFavorited = false; | |
} else { | |
_favoriteCount += 1; | |
_isFavorited = true; | |
} | |
}); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return Row( | |
mainAxisSize: MainAxisSize.min, | |
children: [ | |
Container( | |
padding: EdgeInsets.all(0), | |
child: IconButton( | |
icon: (_isFavorited ? Icon(Icons.star) : Icon(Icons.star_border)), | |
color: Colors.red[500], | |
onPressed: _toggleFavorite, | |
), | |
), | |
SizedBox( | |
width: 18, | |
child: Container( | |
child: Text('$_favoriteCount'), | |
), | |
), | |
], | |
); | |
} | |
} |
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