HarmonyOS 怎么给bindPopup设置全屏的蒙版

参考如下demo：

@Entry
@Component
struct PopupExample {
  @State handlePopup: boolean = false
  @State customPopup: boolean = false
  // popup构造器定义弹框内容
  @Builder popupBuilder() {
    Row({ space: 2 }) {
      Image($r("app.media.startIcon")).width(24).height(24).margin({ left: -5 })
      Text('Custom Popup').fontSize(10)
    }.width(100).height(50).padding(5)
  }

  build() {
    Flex({ direction: FlexDirection.Column }) {
      // PopupOptions 类型设置弹框内容
      Button('PopupOptions')
        .onClick(() => {
          this.handlePopup = !this.handlePopup
        })
        .bindPopup(this.handlePopup, {
          builder: this.popupBuilder,
          placement: Placement.Top,
          mask: {color: Color.Gray},
          popupColor: Color.Yellow,
          enableArrow: true,
          message: 'This is a popup with PopupOptions',
          placementOnTop: true,
          showInSubWindow:false,
          primaryButton: {
            value: 'confirm',
            action: () => {
              this.handlePopup = !this.handlePopup
              console.info('confirm Button click')
            }
          },
          // 第二个按钮
          secondaryButton: {
            value: 'cancel',
            action: () => {
              this.handlePopup = !this.handlePopup
              console.info('cancel Button click')
            }
          },
          onStateChange: (e) => {
            console.info(JSON.stringify(e.isVisible))
            if (!e.isVisible) {
              this.handlePopup = false
            }
          }
        })
        .position({ x: 100, y: 150 })

    }.width('100%').padding({ top: 5 })
  }
}