弹窗中半窗怎么设置？怎么具体设置？

@CustomDialog
struct CustomDialogExample {
  controller?: CustomDialogController;
  build() {
    Column() {
      Text('This is a custom dialog')
        .fontSize(30)
        .margin({ top: 20 });
      Button('Close')
        .onClick(() => {
          if (this.controller != undefined) {
            this.controller.close();
          }
        });
    }
    .borderRadius(10)
    .padding(20);
  }
}

@Entry
@Component
struct CustomDialogUser {
  dialogController: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample()
  });

  build() {
    Column() {
      Button('Open Custom Dialog')
        .onClick(() => {
          this.dialogController.open();
        });
    }
    .width('100%')
    .height('100%');
  }
}