在ExpansionPanelList中使用提供程序

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

class Task {
  String title;
  String description;
  bool isExpanded;

  Task({this.title, this.description, this.isExpanded = false});
}

class TaskProvider with ChangeNotifier {
  List<Task> tasks = [
    Task(title: 'Task 1', description: 'Description 1'),
    Task(title: 'Task 2', description: 'Description 2'),
    Task(title: 'Task 3', description: 'Description 3'),
  ];

  void toggleExpansion(int index) {
    tasks[index].isExpanded = !tasks[index].isExpanded;
    notifyListeners();
  }
}

class ExpansionPanelListWithProvider extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Provider<TaskProvider>(
      create: (_) => TaskProvider(),
      child: Consumer<TaskProvider>(
        builder: (context, taskProvider, _) {
          return ExpansionPanelList(
            elevation: 1,
            expandedHeaderPadding: EdgeInsets.all(0),
            expansionCallback: (int index, bool isExpanded) {
              taskProvider.toggleExpansion(index);
            },
            children: taskProvider.tasks.map<ExpansionPanel>((Task task) {
              return ExpansionPanel(
                headerBuilder: (BuildContext context, bool isExpanded) {
                  return ListTile(
                    title: Text(task.title),
                  );
                },
                body: ListTile(
                  title: Text(task.description),
                ),
                isExpanded: task.isExpanded,
              );
            }).toList(),
          );
        },
      ),
    );
  }
}