怎么在页面绘制完成后获取某个view的宽高和位置？

@Entry  
@Component  
struct a {  
  @State value: string = 'Text1'  
  @State sizeValue: string = ''  
  
  build() {  
    Column() {  
      Text(this.value)  
        .backgroundColor(Color.Green)  
        .margin(30)  
        .fontSize(20)  
        .onClick(() => {  
          this.value = this.value + 'Text'  
        })  
        .onAreaChange((oldValue: Area, newValue: Area) => {  
          console.info(`Ace: on area change, oldValue is ${JSON.stringify(oldValue)} value is ${JSON.stringify(newValue)}`)  
          this.sizeValue = JSON.stringify(newValue)  
        })  
      Text('new area is: \n' + this.sizeValue).margin({ right: 30, left: 30 })  
    }  
    .width('100%').height('100%').margin({ top: 30 })  
  }  
}