如何在vsc扩展中动态更改视图中的子项

import * as vscode from 'vscode';

// 定义子项的数据结构
interface MyItem {
    label: string;
    description: string;
}

// 定义视图容器
class MyTreeDataProvider implements vscode.TreeDataProvider<MyItem> {
    private _onDidChangeTreeData: vscode.EventEmitter<MyItem | undefined> = new vscode.EventEmitter<MyItem | undefined>();
    readonly onDidChangeTreeData: vscode.Event<MyItem | undefined> = this._onDidChangeTreeData.event;

    // 获取子项
    getTreeItem(element: MyItem): vscode.TreeItem {
        return new vscode.TreeItem(element.label);
    }

    // 获取子项的子项
    getChildren(element?: MyItem): Thenable<MyItem[]> {
        if (element) {
            // 返回子项的子项
            return Promise.resolve([]);
        } else {
            // 返回根级子项
            return Promise.resolve([
                { label: 'Item 1', description: 'Description 1' },
                { label: 'Item 2', description: 'Description 2' },
                { label: 'Item 3', description: 'Description 3' }
            ]);
        }
    }

    // 刷新视图
    refresh(): void {
        this._onDidChangeTreeData.fire();
    }
}

export function activate(context: vscode.ExtensionContext) {
    // 创建视图容器实例
    const treeDataProvider = new MyTreeDataProvider();

    // 注册视图
    vscode.window.registerTreeDataProvider('myView', treeDataProvider);

    // 监听文件系统变化，动态更改子项
    vscode.workspace.onDidChangeFileSystem(() => {
        // 更新子项
        treeDataProvider.refresh();
    });
}

export function deactivate() {}