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/*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)
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* Licensed under the MIT License (LICENSE.txt).
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*
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* Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
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* Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
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* Thanks to: Seamus Leahy for adding deltaX and deltaY
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*
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* Version: 3.1.3
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*
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* Requires: 1.2.2+
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*/
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(function (factory) {
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if ( typeof define === 'function' && define.amd ) {
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// AMD. Register as an anonymous module.
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define(['jquery'], factory);
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} else if (typeof exports === 'object') {
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// Node/CommonJS style for Browserify
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module.exports = factory;
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} else {
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// Browser globals
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factory(jQuery);
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}
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}(function ($) {
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var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'];
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var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
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var lowestDelta, lowestDeltaXY;
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if ( $.event.fixHooks ) {
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for ( var i = toFix.length; i; ) {
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$.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
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}
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}
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$.event.special.mousewheel = {
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setup: function() {
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if ( this.addEventListener ) {
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for ( var i = toBind.length; i; ) {
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this.addEventListener( toBind[--i], handler, false );
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}
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} else {
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this.onmousewheel = handler;
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}
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},
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teardown: function() {
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if ( this.removeEventListener ) {
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for ( var i = toBind.length; i; ) {
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this.removeEventListener( toBind[--i], handler, false );
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}
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} else {
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this.onmousewheel = null;
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}
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}
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};
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$.fn.extend({
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mousewheel: function(fn) {
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return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
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},
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unmousewheel: function(fn) {
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return this.unbind("mousewheel", fn);
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}
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});
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function handler(event) {
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var orgEvent = event || window.event,
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args = [].slice.call(arguments, 1),
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delta = 0,
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deltaX = 0,
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deltaY = 0,
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absDelta = 0,
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absDeltaXY = 0,
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fn;
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event = $.event.fix(orgEvent);
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event.type = "mousewheel";
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// Old school scrollwheel delta
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if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta; }
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if ( orgEvent.detail ) { delta = orgEvent.detail * -1; }
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// New school wheel delta (wheel event)
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if ( orgEvent.deltaY ) {
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deltaY = orgEvent.deltaY * -1;
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delta = deltaY;
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}
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if ( orgEvent.deltaX ) {
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deltaX = orgEvent.deltaX;
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delta = deltaX * -1;
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}
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// Webkit
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if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY; }
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if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
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// Look for lowest delta to normalize the delta values
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absDelta = Math.abs(delta);
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if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
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absDeltaXY = Math.max(Math.abs(deltaY), Math.abs(deltaX));
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if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
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// Get a whole value for the deltas
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fn = delta > 0 ? 'floor' : 'ceil';
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delta = Math[fn](delta / lowestDelta);
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deltaX = Math[fn](deltaX / lowestDeltaXY);
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deltaY = Math[fn](deltaY / lowestDeltaXY);
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// Add event and delta to the front of the arguments
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args.unshift(event, delta, deltaX, deltaY);
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return ($.event.dispatch || $.event.handle).apply(this, args);
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}
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}));
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