HarmonyOS 如何实现类似与coordinatelayout的那种tab吸顶的效果？

@Entry  
@Component  
struct listDemo {  
  @State topHeight: number = -1  
  @State topMargin: number = 0  
  isFirst: boolean = true;  
  startTop: number = 0;  
  
  build() {  
    Stack({ alignContent: Alignment.Top }) {  
      // 主内容  
      Scroll() {  
        Column() {  
          ScrollHeaderArea()  
            .onAreaChange((oldArea: Area, newArea: Area) => {  
              if (this.isFirst) {  
                this.isFirst = false;  
                this.startTop = Number(newArea.globalPosition.y)  
              }  
              if (this.startTop - Number(newArea.globalPosition.y) + this.topHeight >= Number(newArea.height)) {  
                console.log("cbl:::----------------------------------------")  
                console.log("cbl:::", this.topHeight)  
                console.log("cbl:::", JSON.stringify(newArea))  
                console.log("cbl:::", this.startTop)  
                console.log("cbl:::", Number(newArea.height))  
                console.log("cbl:::", Number(newArea.globalPosition.y))  
                if (this.topMargin <= 50) {  
                  if (this.startTop - Number(newArea.globalPosition.y) + this.topHeight - Number(newArea.height) >= 50) {  
                    this.topMargin = 50  
                  } else {  
                    this.topMargin = this.startTop - Number(newArea.globalPosition.y) + this.topHeight - Number(newArea.height)  
                  }  
                }  
              } else {  
                this.topMargin = 0  
              }  
            })  
          // 主内容  
          ScrollMainArea({ topMargin: this.topMargin })  
        }.width("100%")  
      }  
      .edgeEffect(EdgeEffect.None)  
      .friction(0.6)  
      .backgroundColor(Color.Grey)  
      .scrollBar(BarState.Off)  
      .width('100%')  
      .height('100%')  
  
      // 头部输入框  
      header()  
        .onAreaChange((oldArea: Area, newArea: Area) => {  
          this.topHeight = Number(newArea.height)  
        })  
    }.height("100%")  
  }  
}