12Flutter页面布局 AspectRatio和Cart卡片组件
2024-09-05 06:02:06
/*
Flutter AspectRatio、Cart卡片组件：
AspectRatio的作用是根据设置调整子元素child的宽高比。
AspectRatio首先会在布局限制条件允许的范围内尽可能的扩展，widget的高度是由宽度和比率决定的。
类似于BoxFit中的contain,按照固定比率去尽量占满区域。
如果在满足所有限制条件过后无法找到一个可行的尺寸，AspectRatio最终将会去优先适应布局限制条件，而忽略所设置的比率。
*/
main.dart
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
} class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(' AspectRatio、Cart卡片组件'),
),
body: HomeContent(),
),
);
}
} class HomeContent extends StatelessWidget {
@override
Widget build(BuildContext context) {
//Stack结合align实现布局：
return AspectRatio(
aspectRatio: 2.0/1.0,
child: Container(
color: Colors.red,
),
);
}
}
Cart卡片组件：
demo1:
main.dart
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(' AspectRatio、Cart卡片组件'),
),
body: HomeContent(),
),
);
}
}
class HomeContent extends StatelessWidget {
@override
Widget build(BuildContext context) {
//Stack结合align实现布局：
return ListView(
children: <Widget>[
Card(
child: Column(
children: <Widget>[
ListTile(title: Text('中国'), subtitle: Text('山东')),
ListTile(
title: Text('青岛'),
),
ListTile(
title: Text('烟台'),
)
],
),
),
Card(
child: Column(
children: <Widget>[
ListTile(title: Text('中国'), subtitle: Text('山东')),
ListTile(
title: Text('青岛'),
),
ListTile(
title: Text('烟台'),
)
],
),
)
],
);
}
}
demo2:
main.dat
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(' AspectRatio、Cart卡片组件'),
),
body: HomeContent(),
),
);
}
}
class HomeContent extends StatelessWidget {
@override
Widget build(BuildContext context) {
//Stack结合align实现布局：
return ListView(
children: <Widget>[
Card(
margin: EdgeInsets.all(10),
child: Column(
children: <Widget>[
AspectRatio(
aspectRatio: 16 / 9,
child: Image.network(
'https://www.itying.com/images/flutter/1.png',fit: BoxFit.cover),
),
ListTile(
leading: ClipOval(
child: Image.network('https://www.itying.com/images/flutter/1.png',fit: BoxFit.cover,width: 50,height: 50),
),
title: Text('data'),
subtitle: Text('data'))
],
),
),
Card(
margin: EdgeInsets.all(10),
child: Column(
children: <Widget>[
AspectRatio(
aspectRatio: 16 / 9,
child: Image.network(
'https://www.itying.com/images/flutter/1.png',fit: BoxFit.cover),
),
ListTile(
leading: CircleAvatar(
backgroundImage: NetworkImage(
'https://www.itying.com/images/flutter/1.png'),
),
title: Text('data'),
subtitle: Text('data'))
],
),
)
],
);
}
}
demo3:
main.dart
import 'package:flutter/material.dart';
import 'res/listData.dart'; void main() {
runApp(MyApp());
} class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
// TODO: implement build
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text(' AspectRatio、Cart卡片组件'),
),
body: HomeContent(),
),
);
}
} class HomeContent extends StatelessWidget {
@override
Widget build(BuildContext context) {
//Stack结合align实现布局：
return ListView(
children: listData.map((value) {
return Card(
margin: EdgeInsets.all(),
child: Column(
children: <Widget>[
AspectRatio(
aspectRatio: / ,
child: Image.network(
"${value['imageUrl']}",
fit: BoxFit.cover),
),
ListTile(
leading: CircleAvatar(
backgroundImage: NetworkImage(
"${value['imageUrl']}"),
),
title: Text("${value['title']}"),
subtitle: Text("${value['descripts']}",maxLines:,overflow: TextOverflow.ellipsis,))
],
),
);
}).toList(),
);
}
}
listData.dart
List listData=[
{
"title":"Candy Shop",
"author":"Mohamed Chahin",
"imageUrl":"https://www.itying.com/images/flutter/1.png",
"descripts":"MohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahin"
},
{
"title":"Candy Shop",
"author":"Mohamed Chahin",
"imageUrl":"https://www.itying.com/images/flutter/2.png",
"descripts":"MohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahin" },
{
"title":"Candy Shop",
"author":"Mohamed Chahin",
"imageUrl":"https://www.itying.com/images/flutter/3.png",
"descripts":"MohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahin" },
{
"title":"Candy Shop",
"author":"Mohamed Chahin",
"imageUrl":"https://www.itying.com/images/flutter/4.png",
"descripts":"MohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahin" },{
"title":"Candy Shop",
"author":"Mohamed Chahin",
"imageUrl":"https://www.itying.com/images/flutter/5.png",
"descripts":"MohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahinMohamedChahin" }
];
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