Flutter树形视图插件flutter_easy_treeview的使用
Flutter树形视图插件flutter_easy_treeview的使用
标题
flutter_easy_treeview
内容
A new Flutter package project.
示例代码
import 'package:flutter/material.dart';
import 'package:flutter_easy_treeview/flutter_easy_treeview.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
[@override](/user/override)
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Easy TreeView',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Easy TreeView'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
[@override](/user/override)
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
EasyTreeController<String> treeController = EasyTreeController<String>();
EasyTreeConfiguration configuration = EasyTreeConfiguration(
defaultExpandAll: true,
padding: EdgeInsets.only(bottom: 5),
);
List<EasyTreeNode<String>> nodes;
[@override](/user/override)
void initState() {
super.initState();
nodes = [
EasyTreeNode<String>(
data: '0',
children: [
EasyTreeNode<String>(
data: '00',
children: [
EasyTreeNode<String>(
data: '000',
children: [
EasyTreeNode<String>(data: '0000'),
EasyTreeNode<String>(data: '0001'),
EasyTreeNode<String>( data: '0002'),
EasyTreeNode<String>( (data: '0003'),
EasyTreeNode<String> ( data: '0004'),
EasyTreeNode<String> ( data: '0005'),
],
),
EasyTreeNode<String>( data: '001'),
],
),
EasyTreeNode<String>( data: '01'),
],
),
EasyTreeNode<String>(
data: '1',
children: [
EasyTreeNode<String>( data: '10'),
],
),
EasyTreeNode<String>(
data: '2',
children: [
EasyTreeNode<String>( data: '20'),
EasyTreeNode<String>(
data: '21',
children: [
EasyTreeNode<String> ( data: '210'),
EasyTreeNode<String> ( data: '2a1'),
],
),
],
),
];
treeController.addListener(() {
print(treeController.selectedNodes);
});
}
[@override](/user/override)
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
actions: <Widget>[
TextButton(
onPressed: () {
nodes.add(EasyTreeNode<String>( data: '3'));
setState(() {});
},
child: Text(
'Update',
style: TextStyle(color: Colors.white),
),
),
],
),
body: Column(
children: <Widget>[
Row(
children: <Widget>[
TextButton(
onPressed: () => treeController.collapseAll(),
child: Text('Collapse All'),
),
TextButton(
onPressed: () => treeController.expandAll(),
child: Text('Expand All'),
),
TextButton(
onPressed: () => treeController.selectAll(),
child: Text('Select All'),
),
TextButton(
onPressed: () => treeController.selectAll(selected: false),
child: Text('UnSelect All'),
),
],
),
Expanded(
child: EasyTreeView<String>(
nodes: nodes,
controller: treeController,
configuration: configuration,
callback: (EasyTreeNode<String> node) {
if (node.isLeaf) {
treeController.select(node);
} else {
treeController.onClick(node);
}
},
itemBuilder: (BuildContext context, EasyTreeNode<String> node) {
Color color = Colors.red;
if (node.level == 1) {
color = Colors.orange;
} else if (node.level == 2) {
color = Colors.blue;
} else if (node.level == 3) {
color = Colors.purple;
}
if (node.selected) color = Colors.green;
return Container(
height: 44.0,
color: color,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Container(
child: Text('${node.expanded.toString()} ${node.data}'),
margin: const EdgeInsets.only(left: 10),
),
TextButton(
onPressed: () => treeController.select(node),
child: Text(
'Select',
style: TextStyle(
color: Colors.white,
),
),
),
],
),
);
},
),
),
],
),
);
}
}
更多关于Flutter树形视图插件flutter_easy_treeview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树形视图插件flutter_easy_treeview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，以下是一个关于如何使用 flutter_easy_treeview 插件在 Flutter 中创建树形视图的代码示例。这个插件允许你以树状结构展示数据，非常适合展示具有层级关系的信息。
首先，确保你的 pubspec.yaml 文件中已经添加了 flutter_easy_treeview 依赖：
dependencies:
flutter:
sdk: flutter
flutter_easy_treeview: ^x.y.z # 请替换为最新版本号
然后运行 flutter pub get 来获取依赖。
接下来，下面是一个简单的示例，展示了如何使用 flutter_easy_treeview 插件来创建一个树形视图：
import 'package:flutter/material.dart';
import 'package:flutter_easy_treeview/flutter_easy_treeview.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Easy TreeView Example',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// 定义树形结构的数据
final List<TreeNodeData> treeData = [
TreeNodeData(
title: 'Node 1',
children: [
TreeNodeData(title: 'Child 1-1'),
TreeNodeData(
title: 'Child 1-2',
children: [
TreeNodeData(title: 'Grandchild 1-2-1'),
],
),
],
),
TreeNodeData(
title: 'Node 2',
children: [
TreeNodeData(title: 'Child 2-1'),
TreeNodeData(title: 'Child 2-2'),
],
),
];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter Easy TreeView Example'),
),
body: Padding(
padding: const EdgeInsets.all(8.0),
child: EasyTreeView(
data: treeData,
getNodeWidget: (TreeNodeData nodeData, int depth) {
return ListTile(
leading: Icon(Icons.folder, color: Colors.blue[depth * 100]),
title: Text(nodeData.title),
onTap: () {
// 在这里处理节点点击事件
print('Node tapped: ${nodeData.title}');
},
);
},
),
),
);
}
}
// TreeNodeData 类定义树节点的数据结构
class TreeNodeData {
final String title;
final List<TreeNodeData>? children;
TreeNodeData({required this.title, this.children});
}
在这个示例中：
- 我们定义了一个简单的树形结构数据
treeData，每个节点包含一个标题和可选的子节点列表。 - 在
MyHomePage中，我们使用EasyTreeView组件来渲染这个树形结构。 getNodeWidget是一个回调函数，用于定义每个节点的显示方式。在这个例子中，我们为每个节点使用了一个ListTile，并添加了一个简单的点击事件处理。depth参数可以用于根据节点的深度调整样式（例如，通过改变图标的颜色）。
这个示例展示了如何使用 flutter_easy_treeview 插件来创建和渲染一个基本的树形视图，并处理节点的点击事件。你可以根据需要进一步自定义节点的样式和行为。
