HarmonyOS 鸿蒙Next CustomDialog自定义弹窗,如何禁用返回键

关于HarmonyOS 鸿蒙Next CustomDialog自定义弹窗 如何禁用返回键可以参考下面代码：

@Entry
@Component
struct Test {
  // 确定删除历史记录的弹窗
  dialogController: CustomDialogController = new CustomDialogController({
    builder: CustomHistoryDialog({
      title: '确认全部删除？',
      cancel: this.onCancel,
      confirm: this.onConfirm,
    }),
    alignment: DialogAlignment.Default, // 可设置dialog的对齐方式，设定显示在底部或中间等，默认为底部显示
    autoCancel: false,
    onWillDismiss: (dismissDialogAction: DismissDialogAction) => {
      if (dismissDialogAction.reason != DismissReason.PRESS_BACK) {
        this.dialogController?.close();
      }
    },
    offset: { dx: 0, dy: -25 }
  })

  onCancel(title: string) {
    promptAction.showToast({ message: `取消${title}` })
  }

  onConfirm() {
    promptAction.showToast({ message: '确定' })
  }

  build() {
    Button('我的按钮')
      .fontColor('#FF5500')
      .fontSize(20)
      .onClick(() => {
        this.dialogController.open()
      })
  }
}

@CustomDialog
struct CustomHistoryDialog {
  controller: CustomDialogController
  title: string = ''
  confirm: () => void = () => {
  }
  cancel: (title: string) => void = (title: string) => {
  }

  build() {
    Column() {
      Text(this.title)
      Row() {
        Button('取消').onClick(() => {
          this.cancel(this.title)
          this.controller.close()
        })

        Button('确定').onClick(() => {
          this.confirm()
          this.controller.close()
        })
      }
    }
  }
}