HarmonyOS 负反馈功能实现问题

需要在长按时获取当前FlowItem的高度，用这个高度作为浮层的高度，参考示例如下：

import { WaterFlowDataSource } from '../Modal/WaterFlowDataSource2';
import { componentUtils } from '@kit.ArkUI';

@Entry
@Component
struct WaterFlowDemo {
  minSize: number = 80
  maxSize: number = 180
  fontSize: number = 24
  colors: number[] = [0xFFC0CB, 0xDA70D6, 0x6B8E23, 0x6A5ACD, 0x00FFFF, 0x00FF7F]
  heights: string[] = ['30%', '35%', '40%', '45%', '50%', '55%']
  scroller: Scroller = new Scroller()
  dataSource: WaterFlowDataSource = new WaterFlowDataSource()
  @State overlayShow: boolean = false; // 浮层
  @State overlayHeight: number = 0;
  @State curIndex: number = -1;
  @State sections: WaterFlowSections = new WaterFlowSections()
  @State isShow: boolean = true;
  lastSection: SectionOptions = {
    itemsCount: 100, crossCount: 2
  }

  aboutToAppear() {
    let sectionOptions: SectionOptions[] = [];
    sectionOptions.push(this.lastSection);
    this.sections.splice(0, 0, sectionOptions);
  }

  @Builder
  OverlayNode(overlayHeight: number) {
    Column() {
      Button('关闭浮层')
        .type(ButtonType.Capsule)
        .fontSize(20)
        .margin({ bottom: 5 })
        .onClick(() => {
          this.overlayShow = false;
        })

      Text("This is overlayNode").fontSize(20).fontColor(Color.White)
    }
    .width('100%')
    .alignItems(HorizontalAlign.Center)
    .backgroundColor('#000000')
    .opacity(0.8)
    .height(overlayHeight)
  }

  build() {
    Column({ space: 2 }) {
      WaterFlow({ scroller: this.scroller }) {
        LazyForEach(this.dataSource, (item: number, index: number) => {
          FlowItem() {
            Stack({ alignContent: Alignment.Center }) {
              Text(index + "")
                .width("100%")
                .height(this.heights[index % 5])
            }
          }
          .id(item.toString())
          .width('100%')
          .overlay(this.curIndex === index && this.overlayShow ? this.OverlayNode(this.overlayHeight) : undefined,
            { align: Alignment.Center })
          // 单指长按文本触发该手势事件
          .gesture(
            LongPressGesture()// 由于repeat设置为true，长按动作存在时会连续触发，触发间隔为duration（默认值500ms）
              .onAction((event: GestureEvent) => {
                if (event) {
                  this.curIndex = index;
                  const componentInfo: componentUtils.ComponentInfo = componentUtils.getRectangleById(item.toString());
                  this.overlayHeight = px2vp(componentInfo.size.height); // 组件大小单位是px，需要转换下
                  this.overlayShow = true;
                  console.log('zkq FlowItem ' + item.toString() + ' ' + JSON.stringify(componentInfo.size));
                }
              })
          )
          .backgroundColor(this.colors[item % 5])
        }, (item: string) => item)
      }
      .columnsTemplate('1fr 1fr') // 瀑布流使用sections参数时该属性无效
      .columnsGap(10)
      .rowsGap(20)
      .backgroundColor(0xFAEEE0)
      .width("100%")
      .layoutWeight(1)
      .height("100%")
    }
  }
}