HarmonyOS 如何封装一个类似promptAction.showDialog()一样的自定义弹窗？

//新建DialogUtils.ets文件  
import { promptAction } from '@kit.ArkUI'  
import { GlobalContext } from './GlobalContext'  
  
@Builder  
export function customDialogBuilder(content: String) {  
  Column() {  
    Text(`Tip: ${content} `).fontSize(20).height("30%")  
    Text('失败原因：失败原因失败原因失败原因失败原因失败原因失败原因失败原因!').fontSize(16).height("30%")  
    Row() {  
      Button("确认").onClick(() => {  
        promptAction.closeCustomDialog(getCustomDialogId())  
      })  
      Blank().width(50)  
      Button("取消").onClick(() => {  
        promptAction.closeCustomDialog(getCustomDialogId())  
      })  
    }  
    .margin({ top: 30 })  
  }.height(200).padding(5)  
}  
  
function getCustomDialogId() {  
  // 取customDialogId  
  let customDialogId = GlobalContext.getContext().getObject('customDialogId') as number  
  return customDialogId;  
}  
  
//新建GlobalContext.ets  
export class GlobalContext {  
  private constructor() {  
  }  
  
  private static instance: GlobalContext;  
  private _objects = new Map<string, Object>();  
  
  public static getContext(): GlobalContext {  
    if (!GlobalContext.instance) {  
      GlobalContext.instance = new GlobalContext();  
    }  
    return GlobalContext.instance;  
  }  
  
  getObject(value: string): Object | undefined {  
    return this._objects.get(value);  
  }  
  
  setObject(key: string, objectClass: Object): void {  
    this._objects.set(key, objectClass);  
  }  
}  
  
//新建HttpUtil.ets文件  
import { GlobalContext } from './GlobalContext';  
import { promptAction } from '@kit.ArkUI';  
import { customDialogBuilder } from './DialogUtils';  
  
  
export function testPromptDialog() {  
  // 方法调用后使用弹窗  
  // 使用GlobalContext中UIContext  
  const that = GlobalContext.getContext().getObject('UIContext') as UIContext;  
  if (that) {  
    promptAction.openCustomDialog({  
      builder: customDialogBuilder.bind(that, "网络请求失败！")  
    }).then((dialogId: number) => {  
      GlobalContext.getContext().setObject('customDialogId', dialogId)  
    })  
  }  
}  
//调用  
import { testPromptDialog } from './HttpUtil';  
testPromptDialog()