Flutter可扩展区域插件expandable_section的使用
Flutter可扩展区域插件expandable_section的使用
插件介绍
expandable_section 是一个可扩展区域插件，用户可以插入他们想要切换可见性的部分。 切换控制器完全由用户提供，这样提供了更多的灵活性，并且没有限制如何提供标题/切换控制器。
特性
- 一个作为隐藏内容容器的子项。
- 默认但可选的
fastOutSlowIn动画，允许您控制隐藏部分展开时的动画曲线类型。
开始使用
在您的 flutter 项目中，添加以下依赖：
dependencies:
expandable_section: <latest_version>
示例代码
下面是一个完整的示例 demo，展示了如何使用 expandable_section 插件。
import 'package:flutter/material.dart';
import 'package:expandable_section/expandable_section.dart';
class Example extends StatefulWidget {
const Example({Key? key}) : super(key: key);
[@override](/user/override)
State<Example> createState() => _ExampleState();
}
class _ExampleState extends State<Example> {
bool _expand = false;
[@override](/user/override)
Widget build(BuildContext context) {
return Column(
children: [
GestureDetector(
onTap: () {
setState(() {
_expand = !_expand;
});
},
child: const Text(
"Show more",
style: TextStyle(
color: Colors.black,
),
),
),
const SizedBox(
height: 10,
),
ExpandableSection(
expand: _expand,
child: const Text("This is the expanded value..."),
),
],
);
}
}
FAQ
如何切换扩展区域
bool _expand = false;
onTap: () {
setState(() {
_expand = !_expand;
});
},
更多示例
import 'package:flutter/material.dart';
import 'package:expandable_section/expandable_section.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatefulWidget {
MyApp({Key? key}) : super(key: key);
[@override](/user/override)
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
bool _isExpandImage = false;
bool _isExpandCard = false;
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Expandable Section Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: const Text('Expandable Section'),
),
body: Container(
padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
width: double.infinity,
child: SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
AnimatedContainer(
duration: const Duration(milliseconds: 2200),
decoration: BoxDecoration(
border: Border.all(width: 1, color: Colors.grey),
borderRadius: _isExpandImage
? const BorderRadius.only(
topLeft: Radius.zero,
topRight: Radius.zero,
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10),
)
: BorderRadius.circular(10)),
child: Column(
children: [
GestureDetector(
onTap: () {
setState(() {
_isExpandImage = !_isExpandImage;
});
},
child: Padding(
padding: const EdgeInsets.only(
left: 8,
right: 8,
top: 8,
bottom: 8,
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text(
"Reveal our special Image",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 220,
),
),
Icon(_isExpandImage
? Icons.keyboard_arrow_up
: Icons.keyboard_arrow_down)
],
),
),
),
ExpandableSection(
expand: _isExpandImage,
child: Container(
height: 300,
width: double.infinity,
margin: const EdgeInsets.only(top: 22),
decoration: const BoxDecoration(
color: Colors.greenAccent,
borderRadius: BorderRadius.only(
topLeft: Radius.zero,
topRight: Radius.zero,
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10),
),
),
child: ClipRRect(
borderRadius: const BorderRadius.only(
topLeft: Radius.zero,
topRight: Radius.zero,
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10),
),
child: Image.network(
"https://images.pexels.com/photos/4491624/pexels-photo-4491624.jpeg?auto=compress&cs=tinysrgb&w=1600&lazy=load",
fit: BoxFit.cover,
),
),
),
),
],
),
),
const SizedBox(
height: 20,
),
AnimatedContainer(
duration: const Duration(milliseconds: 2200),
decoration: BoxDecoration(
border: Border.all(width: 1, color: Colors.grey),
borderRadius: _isExpandCard
? const BorderRadius.only(
topLeft: Radius.zero,
topRight: Radius.zero,
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10),
)
: BorderRadius.circular(10)),
child: Column(
children: [
GestureDetector(
onTap: () {
setState(() {
_isExpandCard = !_isExpandCard;
});
},
child: Padding(
padding: const EdgeInsets.only(
left: 8,
right: 8,
top: 8,
bottom: 8,
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Text(
"Reviews ✨ ",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 220,
),
),
Icon(_isExpandCard
? Icons.keyboard_arrow_up
: Icons.keyboard_arrow_down)
],
),
),
),
ExpandableSection(
expand: _isExpandCard,
child: Container(
width: double.infinity,
margin: const EdgeInsets.only(top: 22, bottom: 10),
padding: const EdgeInsets.symmetric(horizontal: 16),
decoration: const BoxDecoration(
borderRadius: BorderRadius.only(
topLeft: Radius.zero,
topRight: Radius.zero,
bottomLeft: Radius.circular(10),
bottomRight: Radius.circular(10),
),
),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam auctor, purus non interdum porttitor, tortor quam pretium odio, a efficitur nunc tortor fringilla ligula. Vivamus lacinia tortor et dolor lacinia semper. Vestibulum egestas dolor eros, ut dignissim risus posuere vel. Fusce vel lobortis lectus, id imperdiet lacus. Integer accumsan luctus sollicitudin. Praesent vestibulum eros quis augue elementum, finibus ultricies purus convallis. Suspendisse et odio quis magna porta placerat non vel lacus. Pellentesque augue turpis, iaculis non enim id, vestibulum sodales arcu. Proin consectetur neque nibh, et eleifent nisi consequat ac. Phasellus vitae purus ut diam porta bibendum nec ac diam. Fusce fringilla malesuada risus a luctus. Sed ac arcu justo. Suspendisse potenti. Proin consequat mollis ligula, feugiat aliquet velit dignissim eu. Vestibulum aliquam ante quis posuere sagittis. Mauris vel est eros. Donec quis lobortis lectus, ac pulvinar elit. Donec vitae lorem id nisl facilisis ultricies non ut eros. Pellentesque ut tincidunt elit. Mauris mattis diam id massa pretium consectetur. Vivamus sapien dui, viverra id aliquam id, cursus interdum turpis. Sed sed risus leo. Curabitur egestas lacus tempus ligula vestibulum, a dictum nulla consequat. Curabitur fermentum, tortor non ultrices scelerisque, neque diam tincidunt sem, non consequat ex massa ac felis. Nulla vitae orci ac dui pretium cursus. Vivamus quis justo odio. Quisque lobortis orci risus, vitae molestie velit imperdiet vel.",
style: TextStyle(
fontWeight: FontWeight.w300,
fontSize: 16,
color: Colors.grey[850],
),
),
],
),
),
),
],
),
),
const SizedBox(
height: 20,
),
],
),
),
),
),
);
}
}
更多关于Flutter可扩展区域插件expandable_section的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
1 回复
更多关于Flutter可扩展区域插件expandable_section的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然，以下是如何在Flutter中使用expandable_section插件的一个示例代码。这个插件允许你创建一个可扩展和可折叠的区域，非常适合在应用中显示可选信息或设置。
首先，确保你已经在pubspec.yaml文件中添加了expandable_section依赖：
dependencies:
flutter:
sdk: flutter
expandable_section: ^x.y.z # 请替换为最新版本号
然后运行flutter pub get来安装依赖。
接下来，你可以在你的Flutter应用中使用这个插件。以下是一个完整的示例代码：
import 'package:flutter/material.dart';
import 'package:expandable_section/expandable_section.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Expandable Section Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
bool isExpanded = false;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Expandable Section Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Click the button below to expand or collapse the section.',
style: TextStyle(fontSize: 18),
),
SizedBox(height: 20),
ExpandableSection(
title: Text('Expandable Section'),
expanded: isExpanded,
children: [
Text('This is the content of the expandable section.'),
SizedBox(height: 10),
Text('You can add multiple widgets here.'),
],
onExpansionChanged: (newState) {
setState(() {
isExpanded = newState;
});
},
leading: Icon(
isExpanded ? Icons.expand_more : Icons.chevron_right,
),
),
],
),
),
);
}
}
代码解释
-
依赖导入：
import 'package:flutter/material.dart';导入Flutter的基本UI组件。import 'package:expandable_section/expandable_section.dart';导入expandable_section插件。
-
应用入口：
MyApp是应用的入口，它定义了应用的主题和主页。
-
主页：
MyHomePage是一个有状态的组件，它包含一个可扩展区域。isExpanded状态变量用于跟踪可扩展区域是否展开。
-
可扩展区域：
ExpandableSection组件用于创建可扩展区域。title属性定义了区域的标题。expanded属性用于设置区域是否展开。children属性包含展开时显示的子组件。onExpansionChanged回调在展开状态改变时被调用，用于更新isExpanded状态。leading属性定义了展开/折叠图标。
运行这个示例代码，你将看到一个按钮，点击它可以展开或折叠一个包含文本的可扩展区域。这个插件非常适合在用户界面中展示可选信息或设置，提供了一种直观且用户友好的方式来显示或隐藏内容。
