动态获取组件宽高
build() {
Column() {
Button("Test")
.onAreaChange((old,newV)=>{
console.log("onAreaChange 宽",newV.width as number);
console.log("onAreaChange 高",newV.height as number);
console.log("onAreaChange x",newV.position.x);
console.log("onAreaChange y",newV.position.y);
})
}
}