Flutter表单弹出菜单插件modern_form_popupmenu的使用

Flutter表单弹出菜单插件modern_form_popupmenu的使用

modern_form_popupmenu 是一个用于在 Flutter 应用程序中创建表单弹出菜单的插件。通过使用此插件，您可以轻松地为您的应用添加功能丰富的弹出菜单。

开始使用

首先，您需要将 modern_form_popupmenu 添加到您的项目依赖项中。打开您的 pubspec.yaml 文件，并在 dependencies 部分添加以下内容：

dependencies:
  modern_form_popupmenu: ^0.0.1

然后运行 flutter pub get 命令来安装该包。

示例代码

以下是一个简单的示例，演示如何使用 modern_form_popupmenu 插件。

import 'package:flutter/material.dart';
import 'package:modern_form_popupmenu/modern_form_popupmenu.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('modern_form_popupmenu 示例'),
        ),
        body: FormPopupMenuExample(),
      ),
    );
  }
}

class FormPopupMenuExample extends StatefulWidget {
  @override
  _FormPopupMenuExampleState createState() => _FormPopupMenuExampleState();
}

class _FormPopupMenuExampleState extends State<FormPopupMenuExample> {
  String selectedOption = '';

  void onSelected(String value) {
    setState(() {
      selectedOption = value;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Text('选择的选项: $selectedOption'),
          SizedBox(height: 20),
          ElevatedButton(
            onPressed: () {
              showPopupMenu(context);
            },
            child: Text('点击显示弹出菜单'),
          ),
        ],
      ),
    );
  }

  Future<void> showPopupMenu(BuildContext context) async {
    final result = await showModernFormPopup(
      context: context,
      items: [
        PopupMenuItem(
          value: '选项1',
          child: Text('选项1'),
        ),
        PopupMenuItem(
          value: '选项2',
          child: Text('选项2'),
        ),
        PopupMenuItem(
          value: '选项3',
          child: Text('选项3'),
        ),
      ],
    );

    if (result != null) {
      onSelected(result);
    }
  }
}

代码解释

1. 导入必要的库

   import 'package:flutter/material.dart';
   import 'package:modern_form_popupmenu/modern_form_popupmenu.dart';
   

2. 主应用入口

   void main() {
     runApp(MyApp());
   }
   

3. 定义主应用类

   class MyApp extends StatelessWidget {
     @override
     Widget build(BuildContext context) {
       return MaterialApp(
         home: Scaffold(
           appBar: AppBar(
             title: Text('modern_form_popupmenu 示例'),
           ),
           body: FormPopupMenuExample(),
         ),
       );
     }
   }
   

4. 定义状态类

   class _FormPopupMenuExampleState extends State<FormPopupMenuExample> {
     String selectedOption = '';
   
     void onSelected(String value) {
       setState(() {
         selectedOption = value;
       });
     }
   
     @override
     Widget build(BuildContext context) {
       return Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             Text('选择的选项: $selectedOption'),
             SizedBox(height: 20),
             ElevatedButton(
               onPressed: () {
                 showPopupMenu(context);
               },
               child: Text('点击显示弹出菜单'),
             ),
           ],
         ),
       );
     }
   }
   

5. 显示弹出菜单的方法

   Future<void> showPopupMenu(BuildContext context) async {
     final result = await showModernFormPopup(
       context: context,
       items: [
         PopupMenuItem(
           value: '选项1',
           child: Text('选项1'),
         ),
         PopupMenuItem(
           value: '选项2',
           child: Text('选项2'),
         ),
         PopupMenuItem(
           value: '选项3',
           child: Text('选项3'),
         ),
       ],
     );
   
     if (result != null) {
       onSelected(result);
     }
   }