HarmonyOS 相机预览画面会如何保持正常画面比例

XComponent({ 
  id: 'videoRecord', 
  type: 'surface', 
  controller: this.xComponentController 
}).onLoad(() => { 
  this.xComponentController.setXComponentSurfaceSize({ surfaceWidth: 1280, surfaceHeight: 720 }) 
  this.surfaceId = this.xComponentController.getXComponentSurfaceId() 
  this.startPreview() 
}).height('60%') 
  .width('100%')
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