如何进行手机的系统安全区域（safe area）适配？

import web_webview from '@ohos.web.webview'; 
import business_error from '@ohos.base'; 
import { window } from '@kit.ArkUI'; 
 
@Entry 
@Component 
struct WebComponent { 
  webviewController: web_webview.WebviewController = new web_webview.WebviewController(); 
 
  setBarBarProperties(isFullScreen: boolean) { 
    window.getLastWindow(getContext(this)).then((windowClass) => { 
      let isLayoutFullScreen = isFullScreen; 
      windowClass.setWindowLayoutFullScreen(isFullScreen, (err) => { 
        if (err.code) { 
          console.error('Failed to set the window layout to full-screen mode. Cause:' + JSON.stringify(err)); 
          return; 
        } 
        console.info('Succeeded in setting the window layout to full-screen mode.'); 
      }); 
      let names: Array<'status' | 'navigation'> = isFullScreen ? [] : ['status', 'navigation']; 
      windowClass.setWindowSystemBarEnable(names, (err) => { 
        if (err.code) { 
          console.error('Failed to set the system bar to be visible. Cause:' + JSON.stringify(err)); 
          return; 
        } 
        console.info('Succeeded in setting the system bar to be visible.'); 
      }); 
    }) 
  } 
 
 
  aboutToAppear(): void { 
    this.setBarBarProperties(true); 
  } 
 
  aboutToDisappear() { 
    this.setBarBarProperties(false); 
  } 
 
  build() { 
    Column() { 
 
      // 组件创建时，加载www.example.com 
      Web({ src: $rawfile("index1.html"), controller: this.webviewController}) 
        .backgroundColor(Color.Orange) 
        .height("100%") 
 
    } 
  } 
}