HarmonyOS 列表List删除某一项的时候，如何添加动画效果

参考示例如下：

class BasicDataSource implements IDataSource {
  private listeners: DataChangeListener[] = [];
  private originDataArray: string[] = [];

  public totalCount(): number {
    return 0;
  }

  public getData(index: number): string {
    return this.originDataArray[index];
  }

  registerDataChangeListener(listener: DataChangeListener): void {
    if (this.listeners.indexOf(listener) < 0) {
      console.info('add listener');
      this.listeners.push(listener);
    }
  }

  unregisterDataChangeListener(listener: DataChangeListener): void {
    const pos = this.listeners.indexOf(listener);
    if (pos >= 0) {
      console.info('remove listener');
      this.listeners.splice(pos, 1);
    }
  }

  notifyDataReload(): void {
    this.listeners.forEach(listener => {
      listener.onDataReloaded();
    })
  }

  notifyDataAdd(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataAdd(index);
    })
  }

  notifyDataChange(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataChange(index);
    })
  }

  notifyDataDelete(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataDelete(index);
    })
  }

  notifyDataMove(from: number, to: number): void {
    this.listeners.forEach(listener => {
      listener.onDataMove(from, to);
    })
  }
}

class MyDataSource extends BasicDataSource {
  dataArray: string[] = [];

  public totalCount(): number {
    return this.dataArray.length;
  }

  public getData(index: number): string {
    return this.dataArray[index];
  }

  public addData(index: number, data: string): void {
    this.dataArray.splice(index, 0, data);
    this.notifyDataAdd(index);
  }

  // 在数据尾部增加一个元素
  public AddLastItem(): void {
    this.dataArray.splice(this.dataArray.length, 0, this.dataArray.length.toString())
    this.notifyDataAdd(this.dataArray.length - 1)
  }

  public pushData(data: string): void {
    this.dataArray.push(data);
    this.notifyDataAdd(this.dataArray.length - 1);
  }

  public deleteData(index: number): void {
    this.dataArray.splice(index, 1);
    this.notifyDataDelete(index);
  }
}

@Entry
@Component
struct ListEdit {
  private data: MyDataSource = new MyDataSource();
  @State
  transitionTime: TransitionEffect = (TransitionEffect.IDENTITY)

  setDeleteAnimation() {
    this.transitionTime = (TransitionEffect.opacity(0)
      .animation({
        duration: 300,
      })).combine(TransitionEffect.asymmetric(TransitionEffect.move(TransitionEdge.END),
      TransitionEffect.move(TransitionEdge.START)))
  }

  setAddAnimation() {
    this.transitionTime = (TransitionEffect.opacity(0)
      .animation({
        duration: 300,
        delay: 500
      })).combine(TransitionEffect.asymmetric(TransitionEffect.move(TransitionEdge.END),
      TransitionEffect.move(TransitionEdge.START)))
  }

  aboutToAppear() {
    for (let i = 0; i <= 20; i++) {
      this.data.pushData(`${i}`)
    }
  }

  @State index2: number = 100

  build() {
    List({ space: 3 }) {
      LazyForEach(this.data, (item: string, index: number) => {
        ListItem() {
          Row() {
            Text(item)
              .fontSize(50)
              .width('70%')
              .height(80)
              .fontSize(20)
              .textAlign(TextAlign.Center)
              .borderRadius(10)
              .border({ width: 1 })
            Button('del')
              .onClick(() => {
                this.setDeleteAnimation()
                animateTo({
                  duration: 800,
                  delay: 300,
                  curve: Curve.Linear,
                  onFinish: () => {
                    this.transitionTime = (TransitionEffect.IDENTITY) //动画结束时设置禁止转场
                  }
                }, () => {
                  this.data.deleteData(this.data.dataArray.indexOf(item))
                })
              })
            Button('add')
              .onClick(() => {
                this.setAddAnimation()
                // 点击添加数据
                this.index2 = this.index2 + 1
                animateTo({
                  duration: 500, curve: Curve.Smooth, onFinish: () => {
                    this.transitionTime = (TransitionEffect.IDENTITY)
                  }
                }, () => {
                  this.data.addData(0, "new Data" + this.index2)
                })
              })
          }
          .margin({ left: 10, right: 10 })
        }
        .transition(
          this.transitionTime)
        .swipeAction({
          end: {
            onAction: () => {
              this.setDeleteAnimation()
              animateTo({ duration: 1000 }, () => {
                this.data.deleteData(this.data.dataArray.indexOf(item))
              })
            },
            actionAreaDistance: 56,
            onEnterActionArea: () => {
            },
            onExitActionArea: () => {
            }
          }
        })
        .onAppear(() => {
          console.info('item' + item)
          // 即将触底时提前增加数据
          if (item + 1 == this.data.totalCount().toString()) {
            for (let i = 0; i < 10; i++) {
              this.data.AddLastItem()
            }
          }
        })
      }, (item: string) => item)
    }.cachedCount(5)
  }
}
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