/*!
 * jQuery Mousewheel 3.1.13
 *
 * Copyright jQuery Foundation and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 */

(function (factory) {
	if ( typeof define === 'function' && define.amd ) {
		// AMD. Register as an anonymous module.
		define(['jquery'], factory);
	} else if (typeof exports === 'object') {
		// Node/CommonJS style for Browserify
		module.exports = factory;
	} else {
		// Browser globals
		factory(jQuery);
	}
}(function ($) {

	var toFix  = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
		toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
			['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
		slice  = Array.prototype.slice,
		nullLowestDeltaTimeout, lowestDelta;

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

	var special = $.event.special.mousewheel = {
		version: '3.1.12',

		setup: function() {
			if ( this.addEventListener ) {
				for ( var i = toBind.length; i; ) {
					this.addEventListener( toBind[--i], handler, false );
				}
			} else {
				this.onmousewheel = handler;
			}
			// Store the line height and page height for this particular element
			$.data(this, 'mousewheel-line-height', special.getLineHeight(this));
			$.data(this, 'mousewheel-page-height', special.getPageHeight(this));
		},

		teardown: function() {
			if ( this.removeEventListener ) {
				for ( var i = toBind.length; i; ) {
					this.removeEventListener( toBind[--i], handler, false );
				}
			} else {
				this.onmousewheel = null;
			}
			// Clean up the data we added to the element
			$.removeData(this, 'mousewheel-line-height');
			$.removeData(this, 'mousewheel-page-height');
		},

		getLineHeight: function(elem) {
			var $elem = $(elem),
				$parent = $elem['offsetParent' in $.fn ? 'offsetParent' : 'parent']();
			if (!$parent.length) {
				$parent = $('body');
			}
			return parseInt($parent.css('fontSize'), 10) || parseInt($elem.css('fontSize'), 10) || 16;
		},

		getPageHeight: function(elem) {
			return $(elem).height();
		},

		settings: {
			adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
			normalizeOffset: true  // calls getBoundingClientRect for each event
		}
	};

	$.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,
			deltaX     = 0,
			deltaY     = 0,
			absDelta   = 0,
			offsetX    = 0,
			offsetY    = 0;
		event = $.event.fix(orgEvent);
		event.type = 'mousewheel';

		// Old school scrollwheel delta
		if ( 'detail'      in orgEvent ) { deltaY = orgEvent.detail * -1;      }
		if ( 'wheelDelta'  in orgEvent ) { deltaY = orgEvent.wheelDelta;       }
		if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY;      }
		if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }

		// Firefox < 17 horizontal scrolling related to DOMMouseScroll event
		if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
			deltaX = deltaY * -1;
			deltaY = 0;
		}

		// Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
		delta = deltaY === 0 ? deltaX : deltaY;

		// New school wheel delta (wheel event)
		if ( 'deltaY' in orgEvent ) {
			deltaY = orgEvent.deltaY * -1;
			delta  = deltaY;
		}
		if ( 'deltaX' in orgEvent ) {
			deltaX = orgEvent.deltaX;
			if ( deltaY === 0 ) { delta  = deltaX * -1; }
		}

		// No change actually happened, no reason to go any further
		if ( deltaY === 0 && deltaX === 0 ) { return; }

		// Need to convert lines and pages to pixels if we aren't already in pixels
		// There are three delta modes:
		//   * deltaMode 0 is by pixels, nothing to do
		//   * deltaMode 1 is by lines
		//   * deltaMode 2 is by pages
		if ( orgEvent.deltaMode === 1 ) {
			var lineHeight = $.data(this, 'mousewheel-line-height');
			delta  *= lineHeight;
			deltaY *= lineHeight;
			deltaX *= lineHeight;
		} else if ( orgEvent.deltaMode === 2 ) {
			var pageHeight = $.data(this, 'mousewheel-page-height');
			delta  *= pageHeight;
			deltaY *= pageHeight;
			deltaX *= pageHeight;
		}

		// Store lowest absolute delta to normalize the delta values
		absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );

		if ( !lowestDelta || absDelta < lowestDelta ) {
			lowestDelta = absDelta;

			// Adjust older deltas if necessary
			if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
				lowestDelta /= 40;
			}
		}

		// Adjust older deltas if necessary
		if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
			// Divide all the things by 40!
			delta  /= 40;
			deltaX /= 40;
			deltaY /= 40;
		}

		// Get a whole, normalized value for the deltas
		delta  = Math[ delta  >= 1 ? 'floor' : 'ceil' ](delta  / lowestDelta);
		deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
		deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);

		// Normalise offsetX and offsetY properties
		if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
			var boundingRect = this.getBoundingClientRect();
			offsetX = event.clientX - boundingRect.left;
			offsetY = event.clientY - boundingRect.top;
		}

		// Add information to the event object
		event.deltaX = deltaX;
		event.deltaY = deltaY;
		event.deltaFactor = lowestDelta;
		event.offsetX = offsetX;
		event.offsetY = offsetY;
		// Go ahead and set deltaMode to 0 since we converted to pixels
		// Although this is a little odd since we overwrite the deltaX/Y
		// properties with normalized deltas.
		event.deltaMode = 0;

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

		// Clearout lowestDelta after sometime to better
		// handle multiple device types that give different
		// a different lowestDelta
		// Ex: trackpad = 3 and mouse wheel = 120
		if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
		nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);

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

	function nullLowestDelta() {
		lowestDelta = null;
	}

	function shouldAdjustOldDeltas(orgEvent, absDelta) {
		// If this is an older event and the delta is divisable by 120,
		// then we are assuming that the browser is treating this as an
		// older mouse wheel event and that we should divide the deltas
		// by 40 to try and get a more usable deltaFactor.
		// Side note, this actually impacts the reported scroll distance
		// in older browsers and can cause scrolling to be slower than native.
		// Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
		return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
	}

}));
