HarmonyOS swiper修改指示器问题

当前swiper自有的属性不支持设置指示器的间距，如果要设置间距，需要自定义UI来实现指示器，示例代码如下：

class MyDataSource implements IDataSource {
  private list: number[] = []

  constructor(list: number[]) {
    this.list = list
  }

  totalCount(): number {
    return this.list.length
  }

  getData(index: number): number {
    return this.list[index]
  }

  registerDataChangeListener(listener: DataChangeListener): void {
  }

  unregisterDataChangeListener() {
  }
}


@Entry
@Component
struct SwiperExample {
  private swiperController: SwiperController = new SwiperController()
  private data: MyDataSource = new MyDataSource([])
  @State widthLength: number = 0
  @State heightLength: number = 0
  @State currentIndex: number = 0
  // 实现导航点自定义动画

  private swiperWidth: number = 0

  private getTextInfo(index: number): Record<string, number> {
    let strJson = getInspectorByKey(index.toString())
    try {
      let obj: Record<string, string> = JSON.parse(strJson)
      let rectInfo: number[][] = JSON.parse('[' + obj.$rect + ']')
      return { 'left': px2vp(rectInfo[0][0]), 'width': px2vp(rectInfo[1][0] - rectInfo[0][0]) }
    } catch (error) {
      return { 'left': 0, 'width': 0 }
    }
  }

  private getCurrentIndicatorInfo(index: number, event: TabsAnimationEvent): Record<string, number> {
    let nextIndex = index
    if (index > 0 && event.currentOffset > 0) {
      nextIndex--
    } else if (index < 3 && event.currentOffset < 0) {
      nextIndex++
    }
    let indexInfo = this.getTextInfo(index)
    let nextIndexInfo = this.getTextInfo(nextIndex)
    let swipeRatio = Math.abs(event.currentOffset / this.swiperWidth)
    let currentIndex = swipeRatio > 0.5 ? nextIndex : index // 页面滑动超过一半，swiper切换到下一页。
    let currentLeft = indexInfo.left + (nextIndexInfo.left - indexInfo.left) * swipeRatio
    let currentWidth = indexInfo.width + (nextIndexInfo.width - indexInfo.width) * swipeRatio
    return { 'index': currentIndex, 'left': currentLeft, 'width': currentWidth }
  }

  aboutToAppear(): void {
    let list: number[] = []
    for (let i = 1; i <= 6; i++) {
      list.push(i);
    }
    this.data = new MyDataSource(list)
  }

  build() {
    Column({ space: 5 }) {
      Stack({ alignContent: Alignment.Bottom }) {
        Swiper(this.swiperController) {
          // LazyForEach(this.data, (item: string) => {
          // Text(item.toString())
          // .width('90%')
          // .height(160)
          // .backgroundColor(0xAFEEEE)
          // .textAlign(TextAlign.Center)
          // .fontSize(30)
          // }, (item: string) => item)
          Image($r('app.media.background'))
            .backgroundColor(Color.Red)
          Image($r('app.media.startIcon'))
            .backgroundColor(Color.Red)
          Image($r('app.media.background'))
            .backgroundColor(Color.Red)
          Image($r('app.media.startIcon'))
            .backgroundColor(Color.Red)
          Image($r('app.media.background'))
            .backgroundColor(Color.Red)
          Image($r('app.media.startIcon'))
            .backgroundColor(Color.Red)
        }
        .width('100%')
        .height('100%')
        .cachedCount(2)
        .index(0)
        .autoPlay(false)
        .interval(4000)
        .loop(true)
        .duration(1000)
        .itemSpace(0)
        .indicator(false)
        .curve(Curve.Linear)
        .onChange((index: number) => {
          console.info(index.toString())
          this.currentIndex = index
        })
        .onGestureSwipe((index: number, extraInfo: SwiperAnimationEvent) => {
          console.info("index: " + index)
          console.info("current offset: " + extraInfo.currentOffset)


          // 在页面跟手滑动过程中，逐帧触发该回调。
          let currentIndicatorInfo = this.getCurrentIndicatorInfo(index, extraInfo)
          this.currentIndex = currentIndicatorInfo.index
        })
        .onAnimationStart((index: number, targetIndex: number, extraInfo: SwiperAnimationEvent) => {
          console.info("index: " + index)
          console.info("targetIndex: " + targetIndex)
          console.info("current offset: " + extraInfo.currentOffset)
          console.info("target offset: " + extraInfo.targetOffset)
          console.info("velocity: " + extraInfo.velocity)
          // 切换动画开始时触发该回调。下划线跟着页面一起滑动，同时宽度渐变。
          this.currentIndex = targetIndex

        })
        .onAnimationEnd((index: number, extraInfo: SwiperAnimationEvent) => {
          console.info("index: " + index)
          console.info("current offset: " + extraInfo.currentOffset)
        })


        Row() {
          LazyForEach(this.data, (item: string, index: number) => {
            Column()
              .width(this.currentIndex === index ? 15 : 15)
              .height(5)// 实现设置指示器的间距
              .margin(0)
              .borderRadius(5)
              .backgroundColor(this.currentIndex === index ? Color.Red : Color.Gray)
          }, (item: string) => item)
        }
        .margin({ bottom: 4 })
      }
    }.width('100%')
    .margin({ top: 5 })
  }
}
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