cocos-enhance-kit/adapters/platforms/taobao/wrapper/builtin/Canvas.js

import { innerWidth, innerHeight } from './WindowProperties'

function Canvas () {}

let CanvasProxy = new Proxy(Canvas, {
  construct () {

    const canvas = my.createOffscreenCanvas()

    canvas.type = 'canvas'
  
    // canvas.__proto__.__proto__.__proto__ = new HTMLCanvasElement()
  
    const _getContext = canvas.getContext
  
    canvas.getBoundingClientRect = () => {
      const ret = {
        top: 0,
        left: 0,
        width: window.innerWidth,
        height: window.innerHeight
      }
      return ret
    }
  
    canvas.style = {
      top: '0px',
      left: '0px',
      width: innerWidth + 'px',
      height: innerHeight + 'px',
    }
  
    canvas.addEventListener = function (type, listener, options = {}) {
      // console.log('canvas.addEventListener', type);
      document.addEventListener(type, listener, options);
    }
  
    canvas.removeEventListener = function (type, listener) {
      // console.log('canvas.removeEventListener', type);
      document.removeEventListener(type, listener);
    }
  
    canvas.dispatchEvent = function (event = {}) {
      console.log('canvas.dispatchEvent' , event.type, event);
      // nothing to do
    }
  
    Object.defineProperty(canvas, 'clientWidth', {
      enumerable: true,
      get: function get() {
        return innerWidth
      }
    })
  
    Object.defineProperty(canvas, 'clientHeight', {
      enumerable: true,
      get: function get() {
        return innerHeight
      }
    })
  
    return canvas
  },
});

// NOTE: this is a hack operation
// let canvas = new window.Canvas()
// console.error(canvas instanceof window.Canvas)  => false
export default CanvasProxy;