Flutter可扩展列表项插件flutter_expandable_widget的使用
Flutter可扩展列表项插件flutter_expandable_widget的使用
flutter_expandable_widget
是一个用于创建可扩展列表项的 Flutter 插件,它提供了简单的控制来展开和关闭列表项。
Getting Started
在你的 Flutter 项目的 pubspec.yaml
文件中添加以下依赖:
dependencies:
...
flutter_expandable_widget: ^1.0.5
然后导入该插件:
import 'package:flutter_expandable_widget/flutter_expandable_widget.dart';
Usage Examples
ExpandableWidget
以下是一个基本的 ExpandableWidget
示例:
ExpandableWidget(
title: const Padding(
padding: EdgeInsets.only(left: 10),
child: Text('Center'),
),
decoration: const BoxDecoration(color: Color(0xFF81C784)),
childrenPadding: const EdgeInsets.only(top: 50),
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
)
设置尾部图标和旋转动画
你可以自定义尾部图标及其旋转动画的持续时间和旋转次数:
ExpandableWidget(
title: const Text('Change trailing widget'),
decoration: BoxDecoration(color: Colors.yellow, borderRadius: BorderRadius.circular(10)),
trailing: const Icon(Icons.arrow_forward),
trailingStartTurns: 1,
trailingEndTurns: 0.75,
trailingDuration: const Duration(milliseconds: 350),
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
)
设置标题和尾部图标的位置
你可以设置尾部图标相对于标题的位置:
ExpandableWidget(
title: const Text('Trailing At Left'),
decoration: const BoxDecoration(color: Colors.green),
trailing: const Icon(Icons.arrow_back),
trailingPosition: TrailingPosition.left,
trailingStartTurns: 1,
trailingEndTurns: 0.75,
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
)
设置展开方向
你可以设置展开的方向,例如从上到下或从下到上:
ExpandableWidget(
title: const Text('titlePosition At Bottom'),
decoration: BoxDecoration(color: Colors.red[400]),
expansionDirection: ExpansionDirection.expandUp,
trailingPosition: TrailingPosition.right,
trailingEndTurns: -0.25,
content: Column(
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
)
使用 ExpandableWidget.content
你也可以使用 ExpandableWidget.content
来替代 children
属性:
ExpandableWidget.content(
title: const Text('Center'),
decoration: const BoxDecoration(color: Color(0xFF81C784)),
titleRowAxisAlignment: MainAxisAlignment.center,
trailing: const Icon(Icons.arrow_back),
trailingPosition: TrailingPosition.left,
trailingStartTurns: 1,
trailingEndTurns: 0.75,
childrenPadding: const EdgeInsets.only(top: 50),
content: Column(
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
)
完整示例代码
以下是一个完整的示例代码,展示了如何在 Flutter 应用中使用 flutter_expandable_widget
插件:
import 'package:flutter_expandable_widget/flutter_expandable_widget.dart';
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
ExpandableWidgetController expandableWidgetController = ExpandableWidgetController();
ExpandableWidgetController expandableWidgetController2 = ExpandableWidgetController();
ExpandableWidgetController expandableWidgetController3 = ExpandableWidgetController();
ExpandableWidgetController expandableWidgetController4 = ExpandableWidgetController();
ExpandableWidgetController expandableWidgetController5 = ExpandableWidgetController();
@override
void initState() {
super.initState();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('Plugin example app'),
),
body: ListView(
children: [
ExpandableWidget(
title: const Text('T-Shirt'),
decoration: const BoxDecoration(color: Colors.lightBlueAccent),
controller: expandableWidgetController,
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
const SizedBox(height: 20),
ExpandableWidget(
title: const Text('Change trailing widget'),
decoration: BoxDecoration(color: Colors.yellow, borderRadius: BorderRadius.circular(10)),
trailing: const Icon(Icons.arrow_forward),
controller: expandableWidgetController2,
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
const SizedBox(height: 20),
ExpandableWidget(
title: const Text('Trailing At Left'),
decoration: const BoxDecoration(color: Colors.green),
trailing: const Icon(Icons.arrow_back),
trailingPosition: TrailingPosition.left,
trailingStartTurns: 1,
trailingEndTurns: 0.75,
controller: expandableWidgetController3,
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
const SizedBox(height: 20),
ExpandableWidget(
title: const Padding(
padding: EdgeInsets.only(left: 10),
child: Text('Center'),
),
decoration: const BoxDecoration(color: Color(0xFF81C784)),
titleRowAxisAlignment: MainAxisAlignment.center,
trailing: const Icon(Icons.arrow_back),
trailingPosition: TrailingPosition.left,
trailingStartTurns: 1,
trailingEndTurns: 0.75,
controller: expandableWidgetController4,
childrenPadding: const EdgeInsets.only(top: 50),
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
const SizedBox(height: 20),
ExpandableWidget.content(
decoration: BoxDecoration(color: Colors.red[400]),
title: const Text('titlePosition At Bottom'),
expansionDirection: ExpansionDirection.expandUp,
trailingPosition: TrailingPosition.right,
trailingEndTurns: -0.25,
content: Column(
children: const [
Text('S'),
Text('M'),
Text('L'),
Text('XL'),
],
),
),
],
),
),
);
}
}
希望这些示例能帮助你更好地理解和使用 flutter_expandable_widget
插件。如果你有任何问题或需要进一步的帮助,请随时提问!
更多关于Flutter可扩展列表项插件flutter_expandable_widget的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter可扩展列表项插件flutter_expandable_widget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,下面是一个关于如何使用 flutter_expandable_widget
插件的示例代码。这个插件允许你创建一个可扩展和可折叠的列表项。
首先,你需要在你的 pubspec.yaml
文件中添加依赖:
dependencies:
flutter:
sdk: flutter
flutter_expandable_widget: ^2.0.0 # 请确保使用最新版本
然后,运行 flutter pub get
以获取依赖项。
接下来,是一个完整的示例代码,展示如何在 Flutter 应用中使用 flutter_expandable_widget
:
import 'package:flutter/material.dart';
import 'package:flutter_expandable_widget/flutter_expandable_widget.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Expandable Widget Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: ExpandableWidgetDemo(),
);
}
}
class ExpandableWidgetDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Expandable Widget Demo'),
),
body: ListView.builder(
itemCount: 10, // 假设我们有10个可扩展项
itemBuilder: (context, index) {
return Padding(
padding: const EdgeInsets.symmetric(vertical: 8.0),
child: ExpandableNotifier(
initialExpanded: index == 0, // 第一个项目默认展开
child: ExpandablePanel(
header: ListTile(
title: Text('Item $index'),
trailing: Icon(
Icons.expand_more,
),
),
collapsed: Container(
child: Text('This is item $index collapsed content.'),
),
expanded: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text('This is item $index expanded content.'),
SizedBox(height: 10),
Text('More detailed information about item $index.'),
],
),
),
),
);
},
),
);
}
}
在这个示例中,我们做了以下几件事:
- 添加依赖:在
pubspec.yaml
文件中添加了flutter_expandable_widget
依赖。 - 创建应用:在
main.dart
文件中创建了一个简单的 Flutter 应用。 - 使用
ExpandableNotifier
和ExpandablePanel
:在ExpandableWidgetDemo
类中,我们使用了ExpandableNotifier
和ExpandablePanel
来创建可扩展的列表项。 - 生成列表:使用
ListView.builder
来生成一个包含 10 个可扩展项的列表。 - 初始状态:我们设置了第一个项默认展开,通过
initialExpanded
参数。
运行这个示例代码,你将看到一个包含 10 个可扩展项的列表,第一个项默认是展开的,点击其他项的标题可以展开或折叠它们。
希望这个示例能帮助你理解如何在 Flutter 中使用 flutter_expandable_widget
插件。