jQuery extension, add support `scrollstart` and `scrollend` events.

jquery.event.scroll.js

/**
 * jQuery extension, add support `scrollstart` and `scrollend` events.
 *
 * @author	RubaXa	<[email protected]>
 * @github	https://gist.github.com/RubaXa/5568964
 * @license	MIT
 *
 *
 * @settings
 * 		$.special.scrollend.delay = 300; // default ms
 *
 * @flags
 * 		$.isScrolled; // boolean
 *
 * @binding
 * 		$(window).bind('scrollstart scrollend', function (evt){
 * 			if( evt.type == 'scrollstart' ){
 * 				// logic
 * 			}
 * 		});
 *
 */
(function ($){
	var
		  ns		= (new Date).getTime()
		, special	= $.event.special
		, dispatch	= $.event.handle || $.event.dispatch

		, scroll		= 'scroll'
		, scrollStart	= scroll + 'start'
		, scrollEnd		= scroll + 'end'
		, nsScrollStart	= scroll +'.'+ scrollStart + ns
		, nsScrollEnd	= scroll +'.'+ scrollEnd + ns
	;

	special.scrollstart = {
		setup: function (){
			var pid, handler = function (evt/**$.Event*/){
				if( pid == null ){
					evt.type = scrollStart;
					dispatch.apply(this, arguments);
				}
				else {
					clearTimeout(pid);
				}

				pid = setTimeout(function(){
					pid = null;
				}, special.scrollend.delay);

			};

			$(this).bind(nsScrollStart, handler);
		},

		teardown: function (){
			$(this).unbind(nsScrollStart);
		}
	};

	special.scrollend = {
		delay: 300,

		setup: function (){
			var pid, handler = function (evt/**$.Event*/){
				var _this = this, args = arguments;

				clearTimeout(pid);
				pid = setTimeout(function(){
					evt.type = scrollEnd;
					dispatch.apply(_this, args);
				}, special.scrollend.delay);

			};

			$(this).bind(nsScrollEnd, handler);

		},

		teardown: function (){
			$(this).unbind(nsScrollEnd);
		}
	};


	$.isScrolled = false;
	$(window).bind(scrollStart+' '+scrollEnd, function (evt/**Event*/){
		$.isScrolled = (evt.type == scrollStart);
		$('body')[$.isScrolled ? 'addClass' : 'removeClass']('is-scrolled');
	});
})(jQuery);

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