Scroller的fling实现有什么好的方案

@Entry 
@Component 
struct index_231127214143064 { 
  @State arr: number[] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20] 
  @State editFlag: boolean = false 
  scroller: Scroller = new Scroller() 
  private state: boolean = true 
  
  build() { 
    Column() { 
      List({ space: 20, initialIndex: 0, scroller: this.scroller }) { 
        ForEach(this.arr, (item: number, index?: number) => { 
          ListItem() { 
            Flex({ direction: FlexDirection.Row, alignItems: ItemAlign.Center }) { 
              Text('' + item) 
                .width('100%') 
                .height(80) 
                .fontSize(20) 
                .textAlign(TextAlign.Center) 
                .borderRadius(10) 
                .backgroundColor(0xFFFFFF) 
                .flexShrink(1) 
              if (this.editFlag) { 
                Button() { 
                  Text("delete").fontSize(16) 
                }.width('30%').height(40) 
                .onClick(() => { 
                  if (index != undefined) { 
                    console.info(this.arr[index] + 'Delete') 
                    this.arr.splice(index, 1) 
                    console.info(JSON.stringify(this.arr)) 
                    this.editFlag = false 
                  } 
                }).stateEffect(true) 
              } 
            } 
          }.borderWidth(1) 
        }, (item: string) => item) 
      } 
      .onAreaChange((oldValue: Area, newValue: Area) => { 
        console.info(`Ace: on area change, oldValue is ${JSON.stringify(oldValue)} value is ${JSON.stringify(newValue)}`) 
      }) 
      .width('90%') 
      .scrollBar(BarState.Off) 
      .friction(0.6) 
      // .onScrollFrameBegin((offset: number, state: ScrollState) => { 
      //   console.log("111111:" + state) 
      //   return { offsetRemain: offset } 
      // }) 
      .onScroll((scrollOffset: number, scrollState: ScrollState) => { 
        console.log('111111:' + scrollOffset) 
        // 常规滑动后空闲状态，3s下滑100vp距离 
        if (scrollState == ScrollState.Idle && this.state) { 
          this.state = false 
          this.scroller.scrollTo({ 
            xOffset: 0, 
            yOffset: scrollOffset + 100, //下滑100vp的距离 
            animation: { 
              duration: 3000, 
            } 
          }) 
        } 
        console.info(`onScroll scrollState = ScrollState` + scrollState + `, scrollOffset = ` + scrollOffset) 
      }) 
    }.width('100%') 
  } 
}
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