HarmonyOS 鸿蒙Next怎么获取List里所有内容撑满的高度

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/ts-universal-component-area-change-event-V5#onareachange

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Index {
  [@State](/user/State) list: string[] = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];

  build() {
    Column() {
      List() {
        ForEach(this.list, (item: string) => {
          ListItem() {
            Text(item)
              .width('100%')
              .fontSize(16)
              .textAlign(TextAlign.Center)
              .onAreaChange((oldValue: Area, newValue: Area) => {
                console.info(JSON.stringify(newValue.height))
              })
          }
        }, (item: string) => item)
      }
      .width('100%')
      .backgroundColor('#DCDCDC')
    }
    .width('100%')
    .height('100%')
  }
}

~~~
可以试一下获取List中每一个组件的高度进行相加。
~~~

[@Entry](/user/Entry)
[@Component](/user/Component)
struct Index {
  [@State](/user/State) list: string[] = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12'];
  [@State](/user/State) isFlag: boolean = false

  build() {
    Column() {
      List() {
        ForEach(this.list, (item: string, index: number) => {
          ListItem() {
            Text(item)
              .width('100%')
              .fontSize(16)
              .textAlign(TextAlign.Center)
              .fontSize(30)
              .onAreaChange((oldValue: Area, newValue: Area) => {
                if (!this.isFlag) {
                  console.info(JSON.stringify(newValue.height))
                  console.info('length ' + this.list.length)
                  console.info('index ' + index + '-------' + JSON.stringify(newValue.height))
                  this.isFlag = !this.isFlag
                  console.info('sum: ' + Number(newValue.height) * this.list.length)
                }
              })
          }
        }, (item: string) => item)
      }
      .width('100%')
      .backgroundColor('#DCDCDC')
      .height(200)
    }
    .width('100%')
    .height('100%')
  }
}