egroupware_official/phpgwapi/js/jquery/mousewheel/mousewheel.js

//
// jQuery mousewheel extension
//

/*! Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
 * Licensed under the MIT License (LICENSE.txt).
 *
 * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
 * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
 * Thanks to: Seamus Leahy for adding deltaX and deltaY
 *
 * Version: 3.0.6
 *
 * Requires: 1.2.2+
 */

/**
 * 
 * @param {type} $
 * @returns {undefined}
 */
(function($) {

var types = ['DOMMouseScroll', 'mousewheel'];

if ($.event.fixHooks) {
	for ( var i=types.length; i; ) {
		$.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
	}
}

$.event.special.mousewheel = {
	setup: function() {
		if ( this.addEventListener ) {
			for ( var i=types.length; i; ) {
				this.addEventListener( types[--i], handler, false );
			}
		} else {
			this.onmousewheel = handler;
		}
	},

	teardown: function() {
	if ( this.removeEventListener ) {
	for ( var i=types.length; i; ) {
	this.removeEventListener( types[--i], handler, false );
	}
	} else {
	this.onmousewheel = null;
	}
	}
};

$.fn.extend({
	mousewheel: function(fn) {
		return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
	},

	unmousewheel: function(fn) {
		return this.unbind("mousewheel", fn);
	}
});


function handler(event) {
	var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
	event = $.event.fix(orgEvent);
	event.type = "mousewheel";

	// Old school scrollwheel delta
	if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
	if ( orgEvent.detail     ) { delta = -orgEvent.detail/3; }

	// New school multidimensional scroll (touchpads) deltas
	deltaY = delta;

	// Gecko
	if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
		deltaY = 0;
		deltaX = -1*delta;
	}

	// Webkit
	if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
	if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }

	// Add event and delta to the front of the arguments
	args.unshift(event, delta, deltaX, deltaY);

	return ($.event.dispatch || $.event.handle).apply(this, args);
}

})(jQuery);