React - Fabric Js getActiveObject不工作

import React, { Component } from 'react';
import { fabric } from 'fabric';

class Canvas extends Component {
  constructor(props) {
    super(props);
    this.canvasRef = React.createRef();
  }

  componentDidMount() {
    this.canvas = new fabric.Canvas(this.canvasRef.current);
    this.canvas.on('selection:created', this.handleSelection);
    this.canvas.on('selection:updated', this.handleSelection);
    this.canvas.on('selection:cleared', this.handleSelection);
  }

  componentDidUpdate() {
    this.canvas.renderAll();
  }

  handleSelection = () => {
    const activeObject = this.canvas.getActiveObject();
    // 处理选中对象的逻辑
  }

  render() {
    return <canvas ref={this.canvasRef} />;
  }
}

export default Canvas;