HarmonyOs开发：轮播图Banner组件封装与使用

Swiper() {
          ForEach(["1", "2", "3", "4", "5", "6"], (item: string) => {
            Text(item.toString())
              .width('90%')
              .height(160)
              .backgroundColor(0xAFEEEE)
              .textAlign(TextAlign.Center)
              .fontSize(30)
          }, (item: string) => item)
        }

Banner({
          data: ["1", "2", "3", "4", "5", "6"],
          itemPage: this.itemPage
       })

Swiper(this.swiperController) {
        ForEach(this.data, (item: Object, index: number) => {
          this.itemPage(index, item)
        })
      }

/**
 * AUTHOR:AbnerMing
 * DATE:2024/2/23
 * INTRODUCE:懒加载数据
 * */
export class BannerDataSource implements IDataSource {
  private listeners: DataChangeListener[] = []
  private originDataArray: Object[] = []
  /**
   * AUTHOR:AbnerMing
   * INTRODUCE:返回列表数量
   * */
  totalCount(): number {
    return this.originDataArray.length
  }
  /**
   * AUTHOR:AbnerMing
   * INTRODUCE:返回某一个对象
   * */
  getData(index: number): Object {
    return [this.originDataArray[index]]
  }
  /**
   * AUTHOR:AbnerMing
   * INTRODUCE:该方法为框架侧调用，为LazyForEach组件向其数据源处添加listener监听
   * */
  registerDataChangeListener(listener: DataChangeListener): void {
    if (this.listeners.indexOf(listener) < 0) {
      this.listeners.push(listener);
    }
  }
  /**
   * AUTHOR:AbnerMing
   * INTRODUCE:该方法为框架侧调用，为对应的LazyForEach组件在数据源处去除listener监听
   * */
  unregisterDataChangeListener(listener: DataChangeListener): void {
    const pos = this.listeners.indexOf(listener);
    if (pos >= 0) {
      this.listeners.splice(pos, 1);
    }
  }
  // 通知LazyForEach组件需要重载所有子组件
  notifyDataReload(): void {
    this.listeners.forEach(listener => {
      listener.onDataReloaded();
    })
  }
  // 通知LazyForEach组件需要在index对应索引处添加子组件
  notifyDataAdd(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataAdd(index);
    })
  }
  // 通知LazyForEach组件在index对应索引处数据有变化，需要重建该子组件
  notifyDataChange(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataChange(index);
    })
  }
  // 通知LazyForEach组件需要在index对应索引处删除该子组件
  notifyDataDelete(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataDelete(index);
    })
  }
  // 通知LazyForEach组件将from索引和to索引处的子组件进行交换
  notifyDataMove(from: number, to: number): void {
    this.listeners.forEach(listener => {
      listener.onDataMove(from, to);
    })
  }
  //初始化数据
  public addData(index: number, data: Object): void {
    this.originDataArray.splice(index, 0, data);
    this.notifyDataAdd(index);
  }
  //追加数据
  public pushData(data: Object): void {
    this.originDataArray.push(data);
    this.notifyDataAdd(this.originDataArray.length - 1);
  }
  //删除数据
  public deleteData(index: number): void {
    this.originDataArray.splice(index, 1);
    this.notifyDataDelete(index);
  }
  //交换数据
  public moveData(from: number, to: number): void {
    let temp: Object = this.originDataArray[from];
    this.originDataArray[from] = this.originDataArray[to];
    this.originDataArray[to] = temp;
    this.notifyDataMove(from, to);
  }
  /**
   * AUTHOR:AbnerMing
   * INTRODUCE:改变单个数据
   * */
  public changeData(index: number, data: Object): void {
    this.originDataArray.splice(index, 1, data);
    this.notifyDataChange(index);
  }
  //重置所有子组件的index索引
  public reloadData(): void {
    this.notifyDataReload();
  }
}

@State bannerDataSource: BannerDataSource = new BannerDataSource()

Banner({
          data: ["1", "2", "3", "4", "5", "6"],
          itemPage: this.itemPage,
          onLazyDataSource: (dataSource: BannerDataSource) => {
            this.bannerDataSource=dataSource
          }
        })

this.bannerDataSource.pushData()//追加数据
this.bannerDataSource.deleteData()//删除数据