如何监听当前屏幕的横竖屏状态？如何实现页面跟随屏幕横竖屏自动旋转

import { window, display } from '@kit.ArkUI'; 
 
const TAG = 'foo' 
const ORIENTATION: Array<string> = ['垂直', '水平', '反向垂直', '反向水平'] 
 
@Entry 
@Component 
struct ScreenTest { 
  @State rotation: number = 0 
  @State message: string = ORIENTATION[this.rotation] 
 
  aboutToAppear() { 
    this.setOrientation() 
 
    let callback = async () => { 
      // ... 
    } 
    try { 
      display.on("change", callback); // 监听屏幕状态改变 
    } catch (exception) { 
      console.error(TAG, 'Failed to register callback. Code: ' + JSON.stringify(exception)); 
    } 
  } 
 
  setOrientation() { 
    try { 
      window.getLastWindow(getContext(this), (err, data) => { // 获取window实例 
        if (err.code) { 
          console.error(TAG, 'Failed to obtain the top window. Cause: ' + JSON.stringify(err)); 
          return; 
        } 
        let windowClass = data; 
        console.info(TAG, 'Succeeded in obtaining the top window. Data: ' + JSON.stringify(data)); 
 
        let orientation = window.Orientation.AUTO_ROTATION; // 设置窗口方向为传感器自动旋转模式。 
        try { 
          windowClass.setPreferredOrientation(orientation, (err) => { 
            if (err.code) { 
              console.error(TAG, 'Failed to set window orientation. Cause: ' + JSON.stringify(err)); 
              return; 
            } 
            console.info(TAG, 'Succeeded in setting window orientation.'); 
          }); 
        } catch (exception) { 
          console.error(TAG, 'Failed to set window orientation. Cause: ' + JSON.stringify(exception)); 
        } 
        ; 
      }); 
    } catch (exception) { 
      console.error(TAG, 'Failed to obtain the top window. Cause: ' + JSON.stringify(exception)); 
    } 
    ; 
  } 
 
  build() { 
    Row() { 
      Column() { 
        Text(`${this.rotation}`).fontSize(25) 
        Text(`${this.message}`).fontSize(25) 
      } 
      .width("100%") 
    } 
    .height("100%") 
  } 
}
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