HarmonyOS 自定义Refresh头部展示不全

在api12中可以设置refreshOffset属性去更改头部高度值，但是在Api11及以下没有设置高度属性。

@Entry
@Component
struct RefreshExample {
  @State isRefreshing: boolean = false
  @State arr: String[] = ['0', '1', '2', '3', '4']
  @Builder
  customRefreshComponent()
  {
    Stack()
    {
      Column() {
        Image($r('app.media.bgImage')).width('100%').margin(15)
        Row()
        {
          LoadingProgress().height(32)
          Text("正在刷新...").fontSize(16).margin({left:20})
        }
        .alignItems(VerticalAlign.Center)
      }.width('100%')
      .alignItems(HorizontalAlign.Center)
    }.width('100%').align(Alignment.Center)
  }
  build() {
    Column() {
      Refresh({ refreshing: $$this.isRefreshing,builder:this.customRefreshComponent()}) {
        List() {
          ForEach(this.arr, (item: string) => {
            ListItem() {
              Text('' + item)
                .width('100%').height(100).fontSize(16)
                .textAlign(TextAlign.Center).borderRadius(10).backgroundColor(0xFFFFFF)
            }
          }, (item: string) => item)
        }
        .onScrollIndex((first: number) => {
          console.info(first.toString())
        })
        .width('100%')
        .height('100%')
        .scrollBar(BarState.Off)
        .backgroundColor(Color.Gray)
      }
      .refreshOffset(120)
      .pullToRefresh(true)
      .onStateChange((refreshStatus: RefreshStatus) => {
        console.info('Refresh onStatueChange state is ' + refreshStatus)
      })
      .onRefreshing(() => {
        setTimeout(() => {
          this.isRefreshing = false
        }, 2000)
        console.log('onRefreshing test')
      })
      .backgroundColor(0x89CFF0)
    }
  }
}

参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-container-refresh-V5#refreshoffset12