HarmonyOS 如何通过一个全局builder弹出一个自定义全局弹窗

实现全局弹框可参考代码如下：

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);
  }
}

// DialogUtils.ets
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;
}

// HttpUtil.ets
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)
      })
  }
}

// 二、页面测试弹窗效果
// Index.ets
import { GlobalContext } from '../utils/GlobalContext'
import { router } from '@kit.ArkUI'

@Entry
@Component
struct Index {
  aboutToAppear(): void {
    // 存入UIContext与customDialogId
    GlobalContext.getContext().setObject('UIContext', this)
    GlobalContext.getContext().setObject('customDialogId', 0)
  }

  build() {
    Row() {
      Column() {
        Button("跳转其他页面").onClick(() => {
          router.pushUrl({ url: "pages/Page2" })
        })
      }.width('100%')
    }.height('100%')
  }
}

// Page2.ets
import { testPromptDialog } from '../utils/HttpUtil';

@Entry
@Component
struct Page2 {
  @State message: string = 'Hello World';

  build() {
    Row() {
      Column() {
        Button("promptAction弹窗").onClick(() => {
          testPromptDialog()
        })
      }.width('100%')
    }.height('100%')
  }
}