HarmonyOS 鸿蒙Next 自定义Canvas刷新和@ObservedV2如何配合刷新

HarmonyOS 鸿蒙Next 自定义Canvas刷新和@ObservedV2如何配合刷新

自定义的图表组件，需要监听BaseChartPickData改变后，调用图表的invalidate方法刷新。
应该怎么实现呢？

[@ObservedV2](/user/ObservedV2)
export class BaseChartPickData {
  //昨日收盘价格
  @Trace preClosePrice: number
  //240个点
  @Trace themeKLineEntity: Array<TimeSharePointEntry>
}

@Component
export struct HomeMiniFenShi {
  @Prop preClosePrice?: number
  // 240个点
  @Prop themeKLineEntity?: Array<TimeSharePointEntry>
  private miniModel: TimeChartModel | null = null;
  private miniFenShiHelper: MiniFenShiView | null = null;

  aboutToAppear(): void {
    let miniModel4GlobalConfig = new GlobalChartConfig(ShowMode.COUNT)
    miniModel4GlobalConfig.PAGE_SIZE = 241
    this.miniModel = new TimeChartModel(miniModel4GlobalConfig);
    this.miniFenShiHelper = new MiniFenShiView(this.miniModel);
    this.miniFenShiHelper.setMode(false)
    if (this.themeKLineEntity && this.preClosePrice) {
      this.miniFenShiHelper.setNewData(this.getLineData(), this.preClosePrice)
    }
    miniModel4GlobalConfig.addChildChartConfig(this.miniModel)


  }

  build() {

    ChartView({ model: this.miniModel })
      .width('100%')
      .height('100%')

  }
}