HarmonyOS 列表视频滚动播放

// xxx.ets  
@Entry  
@Component  
struct ListExample {  
  private arr: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]  
  @State str:string = '完全不可见'  
  build() {  
    Column() {  
      Text(this.str)  
        .fontSize(24)  
      List({ space: 20, initialIndex: 0 }) {  
        ForEach(this.arr, (item: number,index:number) => {  
          ListItem() {  
            if(index==2){  
              Text('' + item)  
                .width('100%').height(100).fontSize(16)  
                .textAlign(TextAlign.Center).borderRadius(10).backgroundColor(0xFFFFFF)  
                // 组件可见区域变化事件  
                .onVisibleAreaChange([0,1],(isVisible: boolean, currentRatio: number)=>{  
                  if(currentRatio==0){  
                    this.str = '完全不可见'  
                  }else if (currentRatio==1){  
                    this.str = '完全可见'  
                  }else {  
                    this.str = '部分可见'  
                  }  
                })  
            }else {  
              Text('' + item)  
                .width('100%').height(100).fontSize(16)  
                .textAlign(TextAlign.Center).borderRadius(10).backgroundColor(0xFFFFFF)  
            }  
          }  
        }, (item: string) => item)  
      }  
      .listDirection(Axis.Vertical) // 排列方向  
      .scrollBar(BarState.Off)  
      .friction(0.6)  
      .divider({ strokeWidth: 2, color: 0xFFFFFF, startMargin: 20, endMargin: 20 }) // 每行之间的分界线  
      .edgeEffect(EdgeEffect.Spring) // 边缘效果设置为Spring  
      .onScrollIndex((firstIndex: number, lastIndex: number, centerIndex: number) => {  
        console.info('first' + firstIndex)  
        console.info('last' + lastIndex)  
        console.info('center' + centerIndex)  
      })  
      .onScroll((scrollOffset: number, scrollState: ScrollState) => {  
        console.info(`onScroll scrollState = ScrollState` + scrollState + `, scrollOffset = ` + scrollOffset)  
      })  
      .width('90%')  
    }  
    .width('100%')  
    .height('100%')  
    .backgroundColor(0xDCDCDC)  
    .padding({ top: 5 })  
  }  
}
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