如何控制跑马灯反向滚动？

@State fromStart:boolean = false
build() {
  Column() {
    Marquee({
      start: true,//控制跑马灯的暂停与开始
      src: "这是反向滚动的跑马灯哦~",
      fromStart:this.fromStart//true：正向  false：反向
    })
      .fontColor('#FFFFFF')
      .fontSize(48)
      .fontWeight(700)
      .backgroundColor(Color.Orange)
      .margin({ bottom: 40 })
      .width(360)
      .height(80)
    Button("正向滚动").onClick(() => {
      this.fromStart = true
    })
    Button("反向滚动").onClick(() => {
      this.fromStart = false
    })
  }.width("100%")
  .height("100%")
  .justifyContent(FlexAlign.Center)
}