HarmonyOS 输入框自动避让偏移值

请参考以下demo，在输入框下面加入Blank(‘50’):

import { inputMethod } from '@kit.IMEKit'
import { window } from '@kit.ArkUI'
@CustomDialog struct CustomDialogExample {
  controller?: CustomDialogController
  @State @Watch('keyboardHeightChange') keyboardHeight: number = 0
  @State @Watch('keyboardHeightChange') realKeyboardHeight: number = 0
  @State offsetY: number = 0
  aboutToAppear(): void {
    window.getLastWindow(getContext(this), (err, window) => {
      window.on("keyboardHeightChange", (keyboardHeight) => {
        if (keyboardHeight !== 0) {
          this.keyboardHeight = px2vp(keyboardHeight)
        }
      });
    })
  }
  keyboardHeightChange() {
    if (this.keyboardHeight !== 0 && this.realKeyboardHeight !== 0) {
      this.offsetY = this.realKeyboardHeight - this.keyboardHeight
    }
  }
  build() {
    Column() {
      Text('content')
        .fontSize(20)
      TextArea()
        .width("100%") .height(100)
      Blank('50')
      // Text('content') .fontSize(20)
    } .width("100%")
    .offset({y: this.offsetY})
    .backgroundColor(Color.White)
    .borderRadius({topLeft: 32, topRight: 32})
    .onAreaChange((oldValue: Area, newValue: Area) => {
      if (Number(oldValue.globalPosition.y) > Number(newValue.globalPosition.y)) {
        this.realKeyboardHeight = Number(oldValue.globalPosition.y) - Number(newValue.globalPosition.y)
        console.log("")
      }
    })
  }
}
@Entry
@Component struct CustomDialogTest {
  @State message: string = 'Hello World';
  dialogController: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample(), alignment: DialogAlignment.Bottom, customStyle: true
  })

  build() {
    RelativeContainer() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: 'container', align: VerticalAlign.Center },
          middle: { anchor: 'container', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          this.dialogController.open()
        })
    }.height('100%').width('100%')
  }
}