Flutter权限管理插件widget_permission_manager的使用

Flutter权限管理插件widget_permission_manager的使用

widget_permission_manager 是一个用于基于应用访问角色控制子部件的Widget。

获取开始

1. 添加依赖

在你的项目 pubspec.yaml 文件中添加以下依赖：

dependencies:
  widget_permission_manager: ^2.0.2

2. 安装依赖

通过命令行安装依赖包：

flutter pub get

3. 导入库

在需要使用该插件的Dart文件中导入：

import 'package:widget_permission_manager/widget_permission_manager.dart';

示例

以下是使用 widget_permission_manager 的完整示例代码：

import 'package:flutter/material.dart';
import 'package:tuple/tuple.dart';
import 'package:widget_permission_manager/authorization.dart';
import 'package:widget_permission_manager/authorization_widget.dart';

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

class MyApp extends StatelessWidget {
  // 这个小部件是应用程序的根节点。
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      // 应用程序的标题
      title: '授权小部件演示',
      // 应用程序的主页
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  // 构造函数
  MyHomePage();

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  // 设置用户的默认角色
  String _role = 'Admin';

  // 创建一个Authorization对象
  Authorization _authorizationAdmin = Authorization(0, 'Admin only', ['Admin']);
  Authorization _authorizationAll = Authorization(0, 'Guest', ['Admin', 'Guest']);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              // 显示用户当前的角色
              '您的当前角色是 $_role',
              style: Theme.of(context).textTheme.headline6,
            ),
            // 使用AuthorizationWidget来评估显示的信息
            // 如果角色发生变化，设置持续时间以控制切换的速度
            AuthorizationWidget(
              // 给定角色
              // 通常从用户或角色服务获取
              role: _role,
              // 设置如果验证通过后显示的子部件
              children: [
                Tuple2(
                  _authorizationAdmin,
                  Text(
                    '管理员信息',
                    style: Theme.of(context).textTheme.headline4,
                    textAlign: TextAlign.center,
                  ),
                ),
                Tuple2(
                  _authorizationAll,
                  Text(
                    '访客信息',
                    style: Theme.of(context).textTheme.headline4,
                    textAlign: TextAlign.center,
                  ),
                )
              ],
            ),
          ],
        ),
      ),
      // 切换角色的按钮
      floatingActionButton: ElevatedButton(
        // 按钮点击事件
        onPressed: _switchRole,
        // 按钮文本
        child: Text('切换角色'),
      ),
    );
  }

  void _switchRole() {
    setState(() {
      // 在管理员和访客之间切换角色
      _role = _role == 'Admin' ? 'Dev' : 'Admin';
    });
  }
}

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