feat: add pageScaleChange eventbus #321

src/editor/core/draw/Draw.ts

@@ -836,6 +836,9 @@ export class Draw {
     if (this.listener.pageScaleChange) {
       this.listener.pageScaleChange(payload)
     }
+    if (this.eventBus.isSubscribe('pageScaleChange')) {
+      this.eventBus.emit('pageScaleChange', payload)
+    }
   }
 
   public getPagePixelRatio(): number {