@polygonjs/polygonjs/dist/src/core/event/MouseHelper.js

node-based WebGL 3D engine https://polygonjs.com

"use strict";
class MouseHelperClass {
  constructor() {
    this._rectByCanvas = /* @__PURE__ */ new Map();
    this._resetCacheBound = this._resetCache.bind(this);
    globalThis.addEventListener("resize", this._resetCacheBound);
    document.addEventListener("scroll", this._resetCacheBound);
  }
  static instance() {
    return this._instance = this._instance || new MouseHelperClass();
  }
  setEventOffset(cursorPage, canvas, offset) {
    let rect = this._rectByCanvas.get(canvas);
    if (!rect) {
      rect = canvas.getBoundingClientRect();
      this._rectByCanvas.set(canvas, rect);
    }
    offset.offsetX = cursorPage.clientX - rect.left;
    offset.offsetY = cursorPage.clientY - rect.top;
  }
  _resetCache() {
    this._rectByCanvas.clear();
  }
  resetCacheForCanvas(canvas) {
    this._rectByCanvas.delete(canvas);
  }
}
export const MouseHelper = MouseHelperClass.instance();