☰

Mouse Wheel Event Inverter

Inverts values returned by 'wheel' event.

  1. // ==UserScript==
  2. // @name         Mouse Wheel Event Inverter
  3. // @namespace    lainscripts_mouse_wheel_event_inverter
  4. // @description  Inverts values returned by 'wheel' event.
  5. // @version      0.2
  6. // @author       lainverse
  7. // @grant        none
  8. // @run-at       document-start
  9. // Google Maps, Yandex Maps
  10. // @match        *://*/maps/*
  11. // ==/UserScript==
  12.  
  13. (function() {
  14.     'use strict';
  15.  
  16.     let descriptor,
  17.         debug = false;
  18.     for (let prop of ['deltaX', 'deltaY', 'deltaZ']) {
  19.         descriptor = Object.getOwnPropertyDescriptor(WheelEvent.prototype, prop);
  20.         let getter = descriptor.get;
  21.         descriptor.get = function() {
  22.             return -getter.call(this);
  23.         };
  24.         Object.defineProperty(WheelEvent.prototype, prop, descriptor);
  25.     }
  26.  
  27.     if (debug)
  28.         window.addEventListener('wheel', function(e) {
  29.             console.log(e.deltaX, e.deltaY, e.deltaZ, e.deltaMode);
  30.         }, false);
  31. })();