HarmonyOS RelativeContainer如何实现自适应自组件宽高？

@Entry  
@Component  
struct Index {  
  build() {  
    Row() {  
      RelativeContainer() {  
        Row().width(100).height(100)  
          .backgroundColor("#FF3333")  
          .alignRules({  
          })  
          .id("row1")  
          .margin(10)  
        Row().width(100).height(100)  
          .backgroundColor("#FFCC00")  
          .alignRules({  
            left: {anchor: "row1", align: HorizontalAlign.End},  
            top: {anchor: "row1", align: VerticalAlign.Top}  
          })  
          .id("row2")  
        Row().width(100).height(100)  
          .backgroundColor("#FF6633")  
          .alignRules({  
            left: {anchor: "row1", align: HorizontalAlign.Start},  
            top: {anchor: "row1", align: VerticalAlign.Bottom}  
          })  
          .id("row3")  
        Row().width(100).height(100)  
          .backgroundColor("#FF9966")  
          .alignRules({  
            left: {anchor: "row3", align: HorizontalAlign.End},  
            top: {anchor: "row2", align: VerticalAlign.Bottom}  
          })  
          .id("row4")  
          .margin(10)  
      }  
      .width("auto").height("auto")  
      .margin({left: 50})  
      .border({width:2, color: "#6699FF"})  
    }  
    .height('100%')  
  }  
}
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