☰

Enhance!

Enlarge all p tags on a page with AltGr+p (reset with AltGr-o)

当前为 2020-05-18 提交的版本，查看 最新版本。

// ==UserScript==
// @name        Enhance!
// @namespace   meyerk.com
// @match       *://*/*
// @grant       none
// @version     1.1
// @author      MeyerK
// @description Enlarge all p tags on a page with AltGr+p (reset with AltGr-o)
// ==/UserScript==

class enhance
{
  constructor()
  {
    this.isRightAltKey = false;
    this.zoomInc = 3;
    this.currentZoomStep = 0;
    this.maxZoomSteps = 6;
  }
  
  toggleAltGr(ev)
  {
    if ((ev.key == 'AltGraph') && (ev.location == 2))
    {
      this.isRightAltKey = (ev.type == 'keydown') ? true : false; 
    }    
  }
  
  zoom(ev)
  {
    var pElems = null;
    var i = 0;
    var newSize = 0; 
    
    if (this.isRightAltKey)
    {
      if (ev.which == 80)
      {
        pElems = document.querySelectorAll('p');
        this.currentZoomStep = (this.currentZoomStep < this.maxZoomSteps) ? this.currentZoomStep + 1 : 0;

        for (i=0; i<pElems.length; i++)
        {
          var originalSize = parseInt(window.getComputedStyle(pElems[i]).fontSize, 10);

          if (this.currentZoomStep === 0)
          {
            newSize = '';
          }
          else
          {
            newSize = originalSize + this.zoomInc + 'px';
          }

          pElems[i].style.fontSize = newSize;
        }
      }

      if (ev.which == 79)
      {
        pElems = document.querySelectorAll('p');
        this.currentZoomStep = 0;

        for (i=0; i<pElems.length; i++)
        {
          pElems[i].style.fontSize = '';
        }
      }
    }
  }
}

var e = new enhance();
document.addEventListener('keydown', e.toggleAltGr.bind(e));
document.addEventListener('keyup',   e.toggleAltGr.bind(e));
document.addEventListener('keyup',   e.zoom.bind(e));