HarmonyOS List如何实现滑动且中间部分高亮显示

示例参考如下：

@Entry
@Component
struct ListPage {
  private arr: number[] = []
  private scrollerForList: Scroller = new Scroller()
  @State color: number = Color.White
  @State centerIndex: number = 0

  aboutToAppear() {
    for (let i = 0; i < 10; i++) {
      this.arr.push(i)
    }
  }

  build() {
    Column() {
      Button('centerIndex = 5').onClick(() => {
        this.scrollerForList.scrollToIndex(5, true, ScrollAlign.CENTER)
        console.log(`${this.centerIndex}`)
      })
      Button('centerIndex = 7').onClick(() => {
        this.scrollerForList.scrollToIndex(7, true, ScrollAlign.CENTER)
        console.log(`${this.centerIndex}`)
      })
      Button('centerIndex = 9').onClick(() => {
        this.scrollerForList.scrollToIndex(9, true, ScrollAlign.CENTER)
        console.log(`${this.centerIndex}`)
      })
      Button('centerIndex = 3').onClick(() => {
        this.scrollerForList.scrollToIndex(3, true, ScrollAlign.CENTER)
        console.log(`${this.centerIndex}`)
      })
      Button('centerIndex = 0').onClick(() => {
        this.scrollerForList.scrollToIndex(0, true, ScrollAlign.CENTER)
        console.log(`${this.centerIndex}`)
      })
      Row() {
        List({ space: 20, initialIndex: 0, scroller: this.scrollerForList }) {
          ForEach(this.arr, (item: number) => {
            ListItem() {
              Text('' + item)
                .width('100%')
                .height(100)
                .fontSize(16)
                .textAlign(TextAlign.Center)
                .backgroundColor(item === this.centerIndex ? Color.Pink : Color.White)
            }
            .borderRadius(10)
            .width('40%')
            .height('80%')

          }, (item: number) => JSON.stringify(item))
        }
        .chainAnimation(true)
        .edgeEffect(EdgeEffect.Spring)
        .listDirection(Axis.Horizontal)
        .height('100%')
        .width('100%')
        .scrollSnapAlign(ScrollSnapAlign.CENTER)
        .borderRadius(10)
        .backgroundColor(0xDCDCDC)
        .onScrollIndex((firstIndex: number, lastIndex: number, centerIndex: number) => {
          console.info('first' + firstIndex)
          console.info('last' + lastIndex)
          console.info('center' + centerIndex)
          this.centerIndex = centerIndex
        })
      }
      .width('100%')
      .height('100%')
      .backgroundColor(0xDCDCDC)
      .padding({ top: 10 })
    }
  }
}