// xxx.ets
class MyDataSource implements IDataSource {
  private list: number[] = []
  private listener: DataChangeListener

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

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

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

  registerDataChangeListener(listener: DataChangeListener): void {
    this.listener = listener
  }

  unregisterDataChangeListener() {
  }
}

@Entry
@Component
struct SwiperExample {
  private swiperController: SwiperController = new SwiperController()
  private data: MyDataSource = new MyDataSource([])

  aboutToAppear(): void {
    let list = []
    for (var i = 1; i <= 10; i++) {
      list.push(i.toString());
    }
    this.data = new MyDataSource(list)
  }

  build() {
    Column({ space: 5 }) {
      Swiper(this.swiperController) {
        LazyForEach(this.data, (item: string) => {
          Text(item).width('90%').height(160).backgroundColor(0xAFEEEE).textAlign(TextAlign.Center).fontSize(20)
        }, item => item)
      }
      .cachedCount(2)
      .index(1)
      .autoPlay(true)
      .interval(4000)
      .indicator(true) // 默认开启指示点
      .loop(false) // 默认开启循环播放
      .duration(1000)
      .vertical(false) // 默认横向切换
      .itemSpace(0)
      .curve(Curve.Linear) // 动画曲线
      .onChange((index: number) => {
        console.info(index.toString())
      })

      Flex({ justifyContent: FlexAlign.SpaceAround }) {
        Button('next')
          .onClick(() => {
            this.swiperController.showNext()
          })
        Button('preview')
          .onClick(() => {
            this.swiperController.showPrevious()
          })
      }
    }.margin({ top: 5 })
  }
}

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      Swiper(this.swiperController) {
        Image($r('app.media.1')).objectFit(ImageFit.Contain)
        Image($r('app.media.4')).objectFit(ImageFit.Contain)
        Image($r('app.media.2')).objectFit(ImageFit.Contain)
        Image($r('app.media.3')).objectFit(ImageFit.Contain)
        Image($r('app.media.5')).objectFit(ImageFit.Contain)
      }
      .index(0)
      .cachedCount(5)
      .index(1)
      .indicator(true) // 默认开启指示点
      .loop(true) // 默认开启循环播放
      .duration(200)
      .vertical(false) // 默认横向切换
      .itemSpace(0)
      .curve(Curve.Linear) // 动画曲线
      .onChange((index: number) => {
        console.info(index.toString())
      })
      .backgroundColor(Color.Gray)
      .width("100%")
      .height("40%")
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Row()
{
  Button('下一条')
    .onClick(() => {
      this.swiperController.showNext()
    })
  Blank()
    .width("20%")
  Button('上一条')
    .onClick(() => {
      this.swiperController.showPrevious()
    })
}
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      Swiper(this.swiperController) {
        Image($r('app.media.1')).objectFit(ImageFit.Contain)
        Image($r('app.media.4')).objectFit(ImageFit.Contain)
        Image($r('app.media.2')).objectFit(ImageFit.Contain)
        Image($r('app.media.3')).objectFit(ImageFit.Contain)
        Image($r('app.media.5')).objectFit(ImageFit.Contain)
      }
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