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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: 3.1.0 |
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* |
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* Requires: 1.2.2+ |
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*/ |
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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 { |
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// Browser globals |
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factory(jQuery); |
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} |
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}(function ($) { |
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|
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var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll']; |
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var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll']; |
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var lowestDelta, lowestDeltaXY; |
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|
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if ($.event.fixHooks) { |
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for ( var i=toFix.length; i; ) { |
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$.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks; |
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} |
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} |
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|
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$.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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|
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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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|
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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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|
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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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|
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|
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function handler(event) { |
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var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, deltaX = 0, deltaY = 0, absDelta = 0, absDeltaXY = 0; |
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event = $.event.fix(orgEvent); |
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event.type = "mousewheel"; |
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|
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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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|
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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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|
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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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|
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absDelta = Math.abs(delta); |
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if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; } |
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|
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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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|
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// Add event and delta to the front of the arguments |
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args.unshift(event, Math.floor(delta/lowestDelta), Math.floor(deltaX/lowestDeltaXY), Math.floor(deltaY/lowestDeltaXY)); |
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|
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return ($.event.dispatch || $.event.handle).apply(this, args); |
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} |
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|
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})); |
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