HarmonyOS目前能否监听设置中用户修改显示大小或字体大小

import { Callback } from '@ohos.base'; 
import display from '@ohos.display'; 
 
@Entry 
@Component 
struct xxxx { 
  @State message: string = 'Hello World'; 
  private settings: RenderingContextSettings = new RenderingContextSettings(true) 
  private context: CanvasRenderingContext2D = new CanvasRenderingContext2D(this.settings) 
  build() { 
    Row() { 
      Flex({ direction: FlexDirection.Column, alignItems: ItemAlign.Center, justifyContent: FlexAlign.Center }) { 
        Canvas(this.context) 
          .width(180) 
          .height(180) 
          .backgroundColor('#ffff00') 
          .onReady(() => { 
            this.context.fillRect(0, 30, 100, 100) 
          }) 
        Text(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold).onClick(() => { 
          try { 
            display.on("change",()=>{ 
              console.log('显示大小：'+display.getDefaultDisplaySync().densityDPI) 
            }); 
          } catch (exception) { 
            console.error('Failed to register callback. Code: ' + JSON.stringify(exception)); 
          } 
        }) 
      } 
      .width('100%') 
      .height('100%') 
    } 
    .height('100%') 
  } 
}
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