Flutter优雅且灵活的带有动画效果的树形视图组件arborio的使用
Flutter优雅且灵活的带有动画效果的树形视图组件arborio的使用
Arborio简介
Arborio 是一个优雅且灵活的带有动画效果的树形视图组件，可以在Flutter中展示层级数据。以下是Arborio的一些特点：
- 🌳 支持无限嵌套的层级数据展示
- ✨ 展开/折叠操作时具有平滑动画效果
- 🎨 节点和展开器外观完全可定制
- 🔑 提供全局键支持以实现程序化控制
- 🎯 支持泛型，类型安全
- 📱 响应式设计，移动友好
你可以在这里查看实时示例应用。
基本用法
下面是一个简单的例子，展示了如何创建一个树形视图：
import 'package:arborio/tree_view.dart';
import 'package:flutter/material.dart';
enum ElementType { file, folder }
// 定义你的数据类型
class FileSystemElement {
FileSystemElement(this.name, this.type);
final String name;
final ElementType type;
}
// 创建树节点
final nodes = [
TreeNode<FileSystemElement>(
const Key('root'),
FileSystemElement('Documents', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('child1'),
FileSystemElement('report.pdf', ElementType.file),
),
],
),
];
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) => MaterialApp(
home: Scaffold(
body: TreeView<FileSystemElement>(
nodes: nodes,
builder: (context, node, isSelected, animation, select) => Row(
children: [
Icon(
node.data.type == ElementType.folder
? Icons.folder
: Icons.file_copy,
),
Text(node.data.name),
],
),
expanderBuilder: (context, isExpanded, animation) =>
RotationTransition(
turns: animation,
child: const Icon(Icons.chevron_right),
),
),
),
debugShowCheckedModeBanner: false,
);
}
使用TreeViewKey
TreeViewKey允许对树形视图进行程序化控制：
// 创建一个键
const treeViewKey = TreeViewKey<FileSystemElement>();
// 在你的TreeView中使用它
TreeView<FileSystemElement>(
key: treeViewKey,
nodes: nodes,
builder: (context, node, isSelected, animation, select) {
// ... 节点构建器实现
},
expanderBuilder: (context, isExpanded, animation) {
return RotationTransition(
turns: animation,
child: const Icon(Icons.chevron_right),
);
},
)
节点管理
你可以动态地添加或移除节点，下面的例子展示了如何通过状态管理来实现这一点：
// 添加新节点
FloatingActionButton(
onPressed: () => setState(() {
nodes.add(
TreeNode(
const Key('newnode'),
FileSystemElement('New Folder', ElementType.folder),
),
);
}),
child: const Icon(Icons.add),
),
// 展开/折叠所有节点
FloatingActionButton(
onPressed: () => setState(() {
treeViewKey.currentState?.expandAll();
}),
child: const Icon(Icons.expand),
),
FloatingActionButton(
onPressed: () => setState(() {
treeViewKey.currentState?.collapseAll();
}),
child: const Icon(Icons.compress),
),
处理节点事件
你可以监听节点的展开/折叠以及选择变化事件：
TreeView<FileSystemElement>(
onExpansionChanged: (node, expanded) {
print('Node ${node.data.name} is now ${expanded ? 'expanded' : 'collapsed'}');
},
onSelectionChanged: (node) {
print('Selected node: ${node.data.name}');
},
expanderBuilder: (context, isExpanded, animation) {
return RotationTransition(
turns: animation,
child: const Icon(Icons.chevron_right),
);
},
)
自定义节点外观
builder参数提供了对节点外观的全面控制，并包括一个动画变量，以便你能够响应随时间的变化：
builder: (context, node, isSelected, animation, select) {
return InkWell(
onTap: () => select(node),
child: Container(
color: isSelected ? Colors.blue.withOpacity(0.1) : null,
padding: const EdgeInsets.all(8),
child: Row(
children: [
if (node.data.type == ElementType.folder)
RotationTransition(
turns: animation,
child: const Icon(Icons.folder),
)
else
const Icon(Icons.file_copy),
const SizedBox(width: 8),
Text(node.data.name),
],
),
),
);
}
更多功能示例
以下是一个更复杂的示例，展示了更多高级功能，如自定义动画曲线、扩展图标选择等：
import 'dart:ui';
import 'package:arborio/tree_view.dart';
import 'package:flutter/material.dart';
import 'package:path/path.dart' as path;
enum ElementType { file, folder }
class FileSystemElement {
FileSystemElement(this.name, this.type);
final String name;
final ElementType type;
}
List<TreeNode<FileSystemElement>> fileTree() => [
TreeNode<FileSystemElement>(
const Key('Projects'),
FileSystemElement('Projects', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('FlutterApp'),
FileSystemElement('FlutterApp', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('lib'),
FileSystemElement('lib', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('main.dart'),
FileSystemElement('main.dart', ElementType.file),
),
TreeNode<FileSystemElement>(
const Key('app.dart'),
FileSystemElement('app.dart', ElementType.file),
),
],
),
TreeNode<FileSystemElement>(
const Key('assets'),
FileSystemElement('assets', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('logo.png'),
FileSystemElement('logo.png', ElementType.file),
),
TreeNode<FileSystemElement>(
const Key('data.json'),
FileSystemElement('data.json', ElementType.file),
),
],
),
],
),
TreeNode<FileSystemElement>(
const Key('PythonScripts'),
FileSystemElement('PythonScripts', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('script.py'),
FileSystemElement('script.py', ElementType.file),
),
],
),
],
),
TreeNode<FileSystemElement>(
const Key('Documents'),
FileSystemElement('Documents', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('Resume.docx'),
FileSystemElement('Resume.docx', ElementType.file),
),
TreeNode<FileSystemElement>(
const Key('Budget.xlsx'),
FileSystemElement('Budget.xlsx', ElementType.file),
),
],
),
TreeNode<FileSystemElement>(
const Key('Music'),
FileSystemElement('Music', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('Favorites'),
FileSystemElement('Favorites', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('song1.mp3'),
FileSystemElement('song1.mp3', ElementType.file),
),
TreeNode<FileSystemElement>(
const Key('song2.mp3'),
FileSystemElement('song2.mp3', ElementType.file),
),
],
),
],
),
TreeNode<FileSystemElement>(
const Key('Photos'),
FileSystemElement('Photos', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('Vacation'),
FileSystemElement('Vacation', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('image1.jpg'),
FileSystemElement('image1.jpg', ElementType.file),
),
TreeNode<FileSystemElement>(
const Key('image2.jpg'),
FileSystemElement('image2.jpg', ElementType.file),
),
],
),
TreeNode<FileSystemElement>(
const Key('Family'),
FileSystemElement('Family', ElementType.folder),
[
TreeNode<FileSystemElement>(
const Key('photo1.jpg'),
FileSystemElement('photo1.jpg', ElementType.file),
),
],
),
],
),
];
const defaultExpander = Icon(Icons.chevron_right);
const arrowRight = Icon(Icons.arrow_right);
const doubleArrow = Icon(Icons.double_arrow);
const fingerPointer = Text(
'👉',
style: TextStyle(fontSize: 16),
);
void main() {
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final treeViewKey = const TreeViewKey<FileSystemElement>();
String _selectedCurve = 'easeInOut';
Widget _expander = defaultExpander;
int _animationDuration = 500;
final textEditingController = TextEditingController(text: '500');
TreeNode<FileSystemElement>? _selectedNode;
final List<TreeNode<FileSystemElement>> _fileTree = fileTree();
@override
Widget build(BuildContext context) => MaterialApp(
theme: ThemeData(
useMaterial3: true,
colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF44AD4D)),
),
debugShowCheckedModeBanner: false,
home: Scaffold(
backgroundColor: const Color(0xFFFEFCE5),
appBar: PreferredSize(
preferredSize: const Size(
double.infinity,
56,
),
child: ClipRRect(
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 5, sigmaY: 5),
child: AppBar(
backgroundColor: Colors.black.withAlpha(51),
title: Text(_title()),
elevation: 3,
),
),
),
),
body: Stack(
children: [
Opacity(
opacity: .025,
child: Image.asset(
'assets/images/arborio_transparent.png',
fit: BoxFit.scaleDown,
width: double.infinity,
height: double.infinity,
),
),
_treeView(),
Positioned(
bottom: 0,
left: 0,
right: 0,
child: _bottomPane(),
),
],
),
),
);
ClipRRect _bottomPane() => ClipRRect(
child: BackdropFilter(
filter: ImageFilter.blur(sigmaX: 5, sigmaY: 5),
child: Container(
height: 90,
color: Colors.black.withAlpha(26),
width: double.infinity,
child: SingleChildScrollView(
scrollDirection: Axis.horizontal,
child: Row(
children: [
const SizedBox(width: 16),
_durationField(),
const SizedBox(width: 16),
_dropDownsRow(),
const SizedBox(width: 16),
_buttonRow(),
],
),
),
),
),
);
Widget _durationField() => Center(
child: SizedBox(
width: 200,
child: TextField(
keyboardType: TextInputType.number,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(4),
),
labelText: 'Animation Duration (ms)',
),
onChanged: (v) {
setState(() {
_animationDuration = int.tryParse(v) ?? 500;
});
},
controller: textEditingController,
),
),
);
String _title() => 'Arborio Sample${_selectedNode != null ? ' - '
'${_selectedNode!.data.name}' : ''}';
Widget _dropDownsRow() => Row(
children: [
DropdownMenu<Widget>(
label: const Text('Expander'),
onSelected: (v) => setState(() => _expander = v ?? _expander),
initialSelection: _expander,
dropdownMenuEntries: const [
DropdownMenuEntry(value: fingerPointer, label: '👉'),
DropdownMenuEntry(
value: defaultExpander,
label: 'Chevron Right Icon',
),
DropdownMenuEntry(
value: arrowRight,
label: 'Arrow Right',
),
DropdownMenuEntry(
value: doubleArrow,
label: 'Double Arrow',
),
],
),
const SizedBox(width: 16),
DropdownMenu<String>(
label: const Text('Animation Curve'),
onSelected: (v) => _selectedCurve = v ?? _selectedCurve,
initialSelection: _selectedCurve,
dropdownMenuEntries: const [
DropdownMenuEntry(value: 'bounceIn', label: 'bounceIn'),
DropdownMenuEntry(value: 'bounceInOut', label: 'bounceInOut'),
DropdownMenuEntry(value: 'bounceOut', label: 'bounceOut'),
DropdownMenuEntry(value: 'ease', label: 'ease'),
DropdownMenuEntry(value: 'easeIn', label: 'easeIn'),
DropdownMenuEntry(value: 'easeInBack', label: 'easeInBack'),
DropdownMenuEntry(value: 'easeInCirc', label: 'easeInCirc'),
DropdownMenuEntry(value: 'easeInExpo', label: 'easeInExpo'),
DropdownMenuEntry(value: 'easeInOut', label: 'easeInOut'),
DropdownMenuEntry(
value: 'easeInOutBack',
label: 'easeInOutBack',
),
DropdownMenuEntry(
value: 'easeInOutCirc',
label: 'easeInOutCirc',
),
DropdownMenuEntry(
value: 'easeInOutExpo',
label: 'easeInOutExpo',
),
DropdownMenuEntry(
value: 'easeInOutQuad',
label: 'easeInOutQuad',
),
DropdownMenuEntry(
value: 'easeInOutQuart',
label: 'easeInOutQuart',
),
DropdownMenuEntry(
value: 'easeInOutQuint',
label: 'easeInOutQuint',
),
DropdownMenuEntry(
value: 'easeInOutSine',
label: 'easeInOutSine',
),
DropdownMenuEntry(value: 'easeInQuad', label: 'easeInQuad'),
DropdownMenuEntry(value: 'easeInQuart', label: 'easeInQuart'),
DropdownMenuEntry(value: 'easeInQuint', label: 'easeInQuint'),
DropdownMenuEntry(value: 'easeInSine', label: 'easeInSine'),
DropdownMenuEntry(value: 'easeOut', label: 'easeOut'),
DropdownMenuEntry(value: 'easeOutBack', label: 'easeOutBack'),
DropdownMenuEntry(value: 'easeOutCirc', label: 'easeOutCirc'),
DropdownMenuEntry(value: 'easeOutExpo', label: 'easeOutExpo'),
DropdownMenuEntry(value: 'easeOutQuad', label: 'easeOutQuad'),
DropdownMenuEntry(value: 'easeOutQuart', label: 'easeOutQuart'),
DropdownMenuEntry(value: 'easeOutQuint', label: 'easeOutQuint'),
DropdownMenuEntry(value: 'easeOutSine', label: 'easeOutSine'),
DropdownMenuEntry(value: 'elasticIn', label: 'elasticIn'),
DropdownMenuEntry(value: 'elasticInOut', label: 'elasticInOut'),
DropdownMenuEntry(value: 'elasticOut', label: 'elasticOut'),
DropdownMenuEntry(value: 'linear', label: 'linear'),
],
),
],
);
Row _buttonRow() => Row(
children: [
FloatingActionButton(
tooltip: 'Add',
onPressed: () => setState(
() => _fileTree.add(
TreeNode(
const Key('newnode'),
FileSystemElement(
'New Folder',
ElementType.folder,
),
),
),
),
child: const Icon(Icons.add),
),
const SizedBox(width: 16),
FloatingActionButton(
tooltip: 'Expand All',
onPressed: () =>
setState(() => treeViewKey.currentState!.expandAll()),
child: const Icon(Icons.expand),
),
const SizedBox(width: 16),
FloatingActionButton(
tooltip: 'Collapse All',
onPressed: () =>
setState(() => treeViewKey.currentState!.collapseAll()),
child: const Icon(Icons.compress),
),
],
);
TreeView<FileSystemElement> _treeView() => TreeView(
onSelectionChanged: (node) => setState(() => _selectedNode = node),
key: treeViewKey,
animationDuration: Duration(milliseconds: _animationDuration),
animationCurve: switch (_selectedCurve) {
('bounceIn') => Curves.bounceIn,
('bounceInOut') => Curves.bounceInOut,
('bounceOut') => Curves.bounceOut,
('easeInCirc') => Curves.easeInCirc,
('easeInOutExpo') => Curves.easeInOutExpo,
('elasticInOut') => Curves.elasticInOut,
('easeInOut') => Curves.easeInOut,
('easeOutCirc') => Curves.easeOutCirc,
('elasticOut') => Curves.elasticOut,
('elasticIn') => Curves.elasticIn,
('easeIn') => Curves.easeIn,
('ease') => Curves.ease,
('easeInBack') => Curves.easeInBack,
('easeOutBack') => Curves.easeOutBack,
('easeInOutBack') => Curves.easeInOutBack,
('easeInSine') => Curves.easeInSine,
('easeOutSine') => Curves.easeOutSine,
('easeInOutSine') => Curves.easeInOutSine,
('easeInQuad') => Curves.easeInQuad,
('easeOutQuad') => Curves.easeOutQuad,
('easeInOutQuad') => Curves.easeInOutQuad,
('easeInQuart') => Curves.easeInQuart,
('easeOutQuart') => Curves.easeOutQuart,
('easeInOutQuart') => Curves.easeInOutQuart,
('easeInQuint') => Curves.easeInQuint,
('easeOutQuint') => Curves.easeOutQuint,
('easeInOutQuint') => Curves.easeInOutQuint,
('easeInExpo') => Curves.easeInExpo,
('easeOutExpo') => Curves.easeOutExpo,
('linear') => Curves.linear,
_ => Curves.easeInOut,
},
builder: (
context,
node,
isSelected,
expansionAnimation,
select,
) =>
switch (node.data.type) {
(ElementType.file) => InkWell(
onTap: () => select(node),
// ignore: use_decorated_box
child: Container(
margin: const EdgeInsets.symmetric(horizontal: 8),
decoration: BoxDecoration(
gradient: isSelected
? LinearGradient(
colors: [
Theme.of(context)
.colorScheme
.primary
.withAlpha(77),
Theme.of(context)
.colorScheme
.primary
.withAlpha(26),
],
begin: Alignment.topLeft,
end: Alignment.bottomRight,
)
: null,
borderRadius: BorderRadius.circular(4),
),
child: Padding(
padding: const EdgeInsets.all(8),
child: Row(
children: [
Image.asset(
switch (path.extension(node.data.name).toLowerCase()) {
('.mp3') => 'assets/images/music.png',
('.py') => 'assets/images/python.png',
('.jpg') => 'assets/images/image.png',
('.png') => 'assets/images/image.png',
('.dart') => 'assets/images/dart.png',
('.json') => 'assets/images/json.png',
(_) => 'assets/images/file.png'
},
width: 32,
height: 32,
),
const SizedBox(width: 16),
Text(node.data.name),
],
),
),
),
),
(ElementType.folder) => Row(
children: [
RotationTransition(
turns: expansionAnimation,
child: Image.asset(
'assets/images/folder.png',
width: 32,
height: 32,
),
),
const SizedBox(width: 16),
Text(node.data.name),
],
),
},
nodes: _fileTree,
expanderBuilder: (context, node, animationValue) => RotationTransition(
turns: animationValue,
child: _expander,
),
);
}
这个更完整的示例展示了如何结合多种功能，使树形视图更加丰富和互动。希望这些信息能帮助你更好地理解和使用Arborio插件！
更多关于Flutter优雅且灵活的带有动画效果的树形视图组件arborio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优雅且灵活的带有动画效果的树形视图组件arborio的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
探索和使用Flutter中未知功能插件arborio时，我们需要先确保已经将该插件添加到项目中。由于arborio可能是一个不太常见的插件，这里假设它已经在pub.dev上有发布，或者你已经从某个私有源获取到了这个插件。以下是如何在Flutter项目中集成并使用该插件的一个基本示例。
1. 添加依赖
首先，在你的pubspec.yaml文件中添加arborio插件的依赖：
dependencies:
flutter:
sdk: flutter
arborio: ^x.y.z # 替换为实际的版本号
然后运行flutter pub get来安装依赖。
2. 导入插件
在你需要使用arborio插件的Dart文件中导入它：
import 'package:arborio/arborio.dart';
3. 使用插件功能
由于arborio的具体功能未知，这里将展示一个假设的使用场景。假设arborio提供了一个用于处理某种数据的API，我们可以这样使用它：
import 'package:flutter/material.dart';
import 'package:arborio/arborio.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Arborio Plugin Demo'),
),
body: ArborioDemo(),
),
);
}
}
class ArborioDemo extends StatefulWidget {
@override
_ArborioDemoState createState() => _ArborioDemoState();
}
class _ArborioDemoState extends State<ArborioDemo> {
String result = '';
@override
void initState() {
super.initState();
// 假设arborio有一个名为processData的方法
_processData();
}
Future<void> _processData() async {
try {
// 假设这个方法接受一个字符串参数并返回一个处理后的结果
String data = 'example data';
String processedData = await Arborio.processData(data);
// 更新UI
setState(() {
result = processedData;
});
} catch (e) {
// 处理错误
print('Error processing data: $e');
setState(() {
result = 'Error processing data';
});
}
}
@override
Widget build(BuildContext context) {
return Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Processed Data:'),
Text(result),
],
),
);
}
}
在这个示例中，我们假设arborio插件有一个静态方法processData，它接受一个字符串参数并返回一个处理后的结果。我们在initState方法中调用这个方法，并在UI中显示结果。
注意事项
- 插件文档：务必查阅
arborio插件的官方文档或源代码，以了解它的具体功能和使用方法。 - 错误处理：在实际应用中，应添加更详细的错误处理逻辑。
- 权限：如果
arborio插件需要特定的系统权限（如访问存储、相机等），请确保在AndroidManifest.xml和Info.plist中声明这些权限，并在运行时请求权限。
由于arborio是一个未知插件，上述代码仅为一个假设性的示例。在实际使用中，你需要根据插件的实际API和功能进行调整。
