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/* modernizr-test.js
 * Daniel Ott
 * 3 March 2011
 * Custom Tests using Modernizr's addTest API
 */




/* iOS
 * There may be times when we need a quick way to reference whether iOS is in play or not.
 * While a primative means, will be helpful for that.
 */
 
Modernizr.addTest
(
  
  'ipad', function () 
  {
    return !!navigator.userAgent.match(/iPad/i);
  }
  
);


Modernizr.addTest
(
  
  'iphone', function () 
  {
    return !!navigator.userAgent.match(/iPhone/i);
  }

);


Modernizr.addTest
(
  
  'ipod', function () 
  {
    return !!navigator.userAgent.match(/iPod/i);
  }
  
);



Modernizr.addTest
(
  
  'appleios', function () 
  {
    return (Modernizr.ipad || Modernizr.ipod || Modernizr.iphone);
  }
  
);





/* CSS position:fixed
 * Not supported in older IE browsers, nor on Apple's iOS devices.
 * Actually the token example on the Modernizr docs. http://www.modernizr.com/docs/
 */
Modernizr.addTest
(
  
  'positionfixed', function () 
  {
    
    var test = document.createElement('div'),
        control = test.cloneNode(false),
        fake = false,
        root = document.body 
        || 
        (
          
          function () 
          {
          
            fake = true;
        
            return document.documentElement.appendChild
            (document.createElement('body'));
        
          }
          ()
          
        );



    var oldCssText = root.style.cssText;

    root.style.cssText = 'padding:0;margin:0';
    
    test.style.cssText = 'position:fixed;top:42px'; 
    
    root.appendChild(test);
    
    root.appendChild(control);
    
    var ret = test.offsetTop !== control.offsetTop;

    root.removeChild(test);
    
    root.removeChild(control);
    
    root.style.cssText = oldCssText;
    
    
    
    if (fake) 
    {
        document.documentElement.removeChild(root);
    }
    
    
    /* Uh-oh. iOS would return a false positive here.
     * If it's about to return true, we'll explicitly test for known iOS User Agent strings.
     * "UA Sniffing is bad practice" you say. Agreeable, but sadly this feature has made it to
     * Modernizr's list of undectables, so we're reduced to having to use this. */
    return ret && !Modernizr.appleios;

}

);