HarmonyOS RichEditor内容高出能否滚动?

@Entry  
@Component  
struct RichEditor_heightover {  
  controller: RichEditorController = new RichEditorController()  
  // 自定义键盘组件  
  @Builder CustomKeyboardBuilder() {  
    Column() {  
      Grid() {  
        ForEach([1, 2, 3, 4, 5, 6, 7, 8, 9, '*', 0, '#'], (item: number | string) => {  
          GridItem() {  
            Button(item + "")  
              .width(110).onClick(() => {  
              this.controller.addTextSpan(item + '', {  
                offset: this.controller.getCaretOffset(),  
                style:  
                {  
                  fontColor: Color.Orange,  
                  fontSize: 30  
                }  
              })  
              this.controller.setCaretOffset(this.controller.getCaretOffset() + item.toString().length)  
            })  
          }  
        })  
      }.maxCount(3).columnsGap(10).rowsGap(10).padding(5)  
    }.backgroundColor(Color.Gray)  
  }  
  build() {  
    Column() {  
      RichEditor({ controller: this.controller })  
        .height(20)  
        .borderWidth(1)  
        .borderColor(Color.Red)  
        .width("100%")  
    }  
  }  
}