Flutter选择框组件插件bs_flutter_selectbox的使用
Flutter选择框组件插件bs_flutter_selectbox的使用
简介
bs_flutter_selectbox
是一个 Flutter 插件,用于创建类似于 Web HTML 的选择框组件,并支持服务器端数据。该插件具有以下特点:
- 支持服务器端数据的选择框
- 可搜索的选择框选项
- 多选模式
- 自定义选择标签
此插件是 select2
库的最佳替代方案。
开始使用
添加依赖
在 pubspec.yaml
文件中添加 bs_flutter
依赖:
dependencies:
...
bs_flutter: any
创建选择框
导入包
首先,导入 bs_flutter_selectbox
包:
import 'package:bs_flutter_selectbox/bs_flutter_selectbox.dart';
创建控制器
创建一个 BsSelectBoxController
控制器,并初始化选项:
BsSelectBoxController _select1 = BsSelectBoxController(
options: [
BsSelectBoxOption(value: 1, text: Text('1')),
BsSelectBoxOption(value: 2, text: Text('2')),
BsSelectBoxOption(value: 3, text: Text('3')),
]
);
使用选择框
在你的 Flutter 页面中使用 BsSelectBox
组件:
BsSelectBox(
hintText: 'Pilih salah satu',
selectBoxController: _select1,
),
自定义样式和大小
你可以通过 style
和 size
属性来自定义选择框的样式和大小。使用 BsSelectBoxSize
和 BsSelectBoxStyle
类来创建自定义样式:
static const BsSelectBoxSize customSize = BsSelectBoxSize(
fontSize: 14.0,
optionFontSize: 14.0,
searchInputFontSize: 14.0,
labelX: 15.0,
labelY: 13.0,
transitionLabelX: -15.0,
transitionLabelY: 5.0,
padding: EdgeInsets.only(left: 15.0, right: 15.0, top: 12.0, bottom: 12.0)
);
static const BsSelectBoxStyle outline = BsSelectBoxStyle(
borderRadius: BorderRadius.all(Radius.circular(5.0))
);
带有提示标签的选择框
使用 hintTextLabel
属性来创建带有提示标签的选择框:
BsSelectBox(
hintTextLabel: 'Pilih salah satu',
selectBoxController: _select1,
),
多选模式
要创建一个多选选择框,只需将 multiple
属性设置为 true
:
BsSelectBoxController _select2 = BsSelectBoxController(
multiple: true,
options: [
BsSelectBoxOption(value: 1, text: Text('1')),
BsSelectBoxOption(value: 2, text: Text('2')),
BsSelectBoxOption(value: 3, text: Text('3')),
BsSelectBoxOption(value: 4, text: Text('4')),
BsSelectBoxOption(value: 5, text: Text('5')),
BsSelectBoxOption(value: 6, text: Text('6')),
]
);
BsSelectBox(
hintText: 'Pilih multiple',
selectBoxController: _select2,
),
服务器端数据
要创建一个从服务器获取数据的选择框,使用 serverSide
属性并提供一个返回 Future<BsSelectBoxResponse>
的函数:
Future<BsSelectBoxResponse> selectApi(Map<String, String> params) async {
Uri url = Uri.http('localhost', 'api-json.php', params);
Response response = await http.get(url);
if (response.statusCode == 200) {
List json = convert.jsonDecode(response.body);
return BsSelectBoxResponse.createFromJson(json);
}
return BsSelectBoxResponse(options: []);
}
BsSelectBox(
hintText: 'Pilih salah satu',
searchable: true,
selectBoxController: _select3,
serverSide: selectApi,
),
示例代码
以下是一个完整的示例代码,展示了如何使用 bs_flutter_selectbox
插件:
import 'package:bs_flutter_buttons/bs_flutter_buttons.dart';
import 'package:bs_flutter_modal/bs_flutter_modal.dart';
import 'package:bs_flutter_responsive/bs_flutter_responsive.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:bs_flutter_selectbox/bs_flutter_selectbox.dart';
import 'package:http/http.dart' as http;
import 'dart:convert' as convert;
void main() {
runApp(MaterialApp(home: MyApp()));
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
GlobalKey<FormState> _formState = GlobalKey<FormState>();
BsSelectBoxController _select1 = BsSelectBoxController(options: [
BsSelectBoxOption(value: 1, text: Text('1')),
BsSelectBoxOption(value: 2, text: Text('2')),
BsSelectBoxOption(value: 3, text: Text('3')),
]);
BsSelectBoxController _select2 = BsSelectBoxController(options: [
BsSelectBoxOption(value: 1, text: Text('1')),
BsSelectBoxOption(value: 2, text: Text('2')),
BsSelectBoxOption(value: 3, text: Text('3')),
]);
BsSelectBoxController _select3 = BsSelectBoxController(multiple: true);
BsSelectBoxController _select4 = BsSelectBoxController();
BsSelectBoxController _select5 = BsSelectBoxController();
BsSelectBoxController _select6 = BsSelectBoxController(multiple: true, options: [
BsSelectBoxOption(value: 1, text: Text('1')),
BsSelectBoxOption(value: 2, text: Text('2')),
BsSelectBoxOption(value: 3, text: Text('3')),
BsSelectBoxOption(value: 4, text: Text('4')),
BsSelectBoxOption(value: 5, text: Text('5')),
BsSelectBoxOption(value: 6, text: Text('6')),
]);
@override
void initState() {
super.initState();
}
Future<BsSelectBoxResponse> selectApi(Map<String, String> params) async {
Uri url = Uri.http('localhost', 'api-json.php', params);
Response response = await http.get(url);
if (response.statusCode == 200) {
List json = convert.jsonDecode(response.body);
return BsSelectBoxResponse.createFromJson(json);
}
return BsSelectBoxResponse(options: []);
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: GestureDetector(
onTap: () {
SelectBoxOverlay.removeAll();
},
child: Scaffold(
appBar: AppBar(
title: Text('Select Box'),
),
body: Scrollbar(
child: SingleChildScrollView(
child: Container(
padding: EdgeInsets.all(20.0),
child: Form(
key: _formState,
child: Column(
children: [
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
hintText: 'Pilih salah satu',
controller: _select1,
validators: [
BsSelectValidators.required
],
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
padding: EdgeInsets.fromLTRB(20.0, 12.0, 20.0, 12.0),
hintTextLabel: 'Pilih salah satu',
controller: _select2,
searchable: true,
dialogStyle: BsDialogBoxStyle(
borderRadius: BorderRadius.circular(20.0),
),
style: BsSelectBoxStyle(
backgroundColor: Colors.blueAccent,
hintTextColor: Colors.white,
selectedColor: Color(0xff3872d1),
selectedTextColor: Colors.white,
textColor: Colors.white,
borderRadius: BorderRadius.circular(50.0),
focusedTextColor: Color(0xff3367bd),
),
paddingDialog: EdgeInsets.all(15),
marginDialog: EdgeInsets.only(top: 5.0, bottom: 5.0),
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
padding: EdgeInsets.fromLTRB(20.0, 12.0, 20.0, 12.0),
hintTextLabel: 'Pilih salah satu',
controller: _select2,
searchable: true,
style: BsSelectBoxStyle(
backgroundColor: Colors.lightGreen,
hintTextColor: Colors.white,
selectedColor: Color(0xff608733),
selectedTextColor: Colors.white,
textColor: Colors.white,
focusedTextColor: Color(0xff608733),
borderRadius: BorderRadius.circular(50.0),
),
dialogStyle: BsDialogBoxStyle(
borderRadius: BorderRadius.circular(20.0),
),
paddingDialog: EdgeInsets.all(15),
marginDialog: EdgeInsets.only(top: 5.0, bottom: 5.0),
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
hintText: 'Pilih multiple',
controller: _select3,
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
searchable: true,
disabled: true,
hintText: 'Pilih salah satu',
controller: _select5,
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
hintText: 'Pilih salah satu',
searchable: true,
controller: _select4,
serverSide: selectApi,
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsButton(
label: Text('Validate'),
prefixIcon: Icons.open_in_new,
style: BsButtonStyle.primary,
onPressed: () {
_formState.currentState!.validate();
},
),
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsButton(
label: Text('Set Selected Multiple'),
prefixIcon: Icons.open_in_new,
style: BsButtonStyle.primary,
onPressed: () {
_select3.setSelected(BsSelectBoxOption(value: '1', text: Text('Test')));
setState(() {
});
},
),
),
BsButton(
label: Text('Open Modal'),
prefixIcon: Icons.open_in_new,
style: BsButtonStyle.primary,
onPressed: () {
showDialog(
context: context,
builder: (context) => BsModal(
context: context,
dialog: BsModalDialog(
child: BsModalContent(
children: [
BsModalContainer(title: Text('Modal Select Box'), closeButton: true),
BsModalContainer(child: Column(
children: [
BsCol(
sizes: ColScreen(sm: Col.col_2),
child: BsSelectBox(
hintText: 'Pilih salah satu',
searchable: true,
controller: _select6,
autoClose: false,
alwaysUpdate: false,
serverSide: selectApi,
),
)
],
))
],
),
),
),
);
},
),
Container(
margin: EdgeInsets.only(bottom: 10.0),
child: BsSelectBox(
margin: EdgeInsets.only(top: 200.0),
hintText: 'Pilih salah satu',
controller: _select1,
validators: [
BsSelectValidators.required
],
),
),
],
),
),
),
),
),
),
),
);
}
}
以上代码展示了如何使用 bs_flutter_selectbox
插件创建各种类型的选择框,包括单选、多选、带提示标签、服务器端数据等。希望这些示例对你有所帮助!
更多关于Flutter选择框组件插件bs_flutter_selectbox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选择框组件插件bs_flutter_selectbox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 bs_flutter_selectbox
插件的示例代码。bs_flutter_selectbox
是一个 Flutter 插件,用于在应用中创建选择框组件。假设你已经将 bs_flutter_selectbox
添加到了你的 pubspec.yaml
文件中,并且已经运行了 flutter pub get
。
首先,确保你的 pubspec.yaml
文件包含以下依赖项:
dependencies:
flutter:
sdk: flutter
bs_flutter_selectbox: ^最新版本号 # 请替换为实际的最新版本号
然后,你可以在你的 Flutter 应用中使用 bs_flutter_selectbox
。以下是一个简单的示例代码,展示如何使用这个插件:
import 'package:flutter/material.dart';
import 'package:bs_flutter_selectbox/bs_flutter_selectbox.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter SelectBox Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(),
);
}
}
class MyHomePage extends StatefulWidget {
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
String? selectedValue;
final List<SelectBoxItem> items = [
SelectBoxItem(value: '1', text: 'Option 1'),
SelectBoxItem(value: '2', text: 'Option 2'),
SelectBoxItem(value: '3', text: 'Option 3'),
];
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Flutter SelectBox Demo'),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'Selected Value: ${selectedValue ?? 'None'}',
style: TextStyle(fontSize: 20),
),
SizedBox(height: 20),
BSSelectBox(
items: items,
value: selectedValue,
onChanged: (newValue) {
setState(() {
selectedValue = newValue;
});
},
),
],
),
),
);
}
}
在这个示例中:
- 我们首先导入了必要的包,包括
flutter/material.dart
和bs_flutter_selectbox/bs_flutter_selectbox.dart
。 - 创建了一个简单的 Flutter 应用,其中包含一个
MyApp
和一个MyHomePage
。 - 在
MyHomePage
中,我们定义了一个selectedValue
变量来存储用户的选择。 - 创建了一个
items
列表,其中包含了一些SelectBoxItem
,每个SelectBoxItem
都有一个value
和一个text
。 - 在
build
方法中,我们构建了一个简单的 UI,包含一个显示当前选择值的Text
组件和一个BSSelectBox
组件。 - 当用户更改选择时,
BSSelectBox
的onChanged
回调会被触发,更新selectedValue
并重新构建 UI。
这个示例展示了如何使用 bs_flutter_selectbox
插件在 Flutter 应用中创建一个简单的选择框组件。你可以根据自己的需求进一步自定义和扩展这个示例。