HarmonyOS 如何在自定义@Component中获取屏幕的宽高？

x = display.getDefaultDisplaySync().width;  
y = display.getDefaultDisplaySync().height;  
//x,y方向中每英寸屏幕的确切物理像素值。  
xDpi = display.getDefaultDisplaySync().xDPI;  
yDpi = display.getDefaultDisplaySync().yDPI;

@Component  
export default struct Test {  
  @State myWidth: number = 0;  
  @State myHeight: number = 0;  
  build() {  
    Column(){  
      Text(`宽度：${this.myWidth}，高度：${this.myHeight}`)  
      Button('获取Test的宽高').onClick(()=>{  
        const myTest = JSON.parse(getInspectorByKey("myTest"))  
       this.myHeight = myTest.$attrs.height;  
        this.myWidth = myTest.$attrs.width;  
      })  
    }  
    .width('100%')  
  }  
}  
@Entry  
@Component  
struct HeightPage {  
  @State message: string = 'Hello World';  
  
  build() {  
    Row() {  
      Column() {  
        Text(this.message)  
          .fontSize(50)  
          .fontWeight(FontWeight.Bold)  
        Test()  
          .width(150)  
          .height(100)  
          .id('myTest')  
      }  
      .width('100%')  
    }  
    .height('100%')  
  }  
}