jquery.mousewheel.js
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/*! Copyright (c) 2013 Brandon Aaron (http://brandon.aaron.sh)
* Licensed under the MIT License (LICENSE.txt).
*
* Version: 3.1.6
*
* Requires: jQuery 1.2.2+
*/
(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;
}
}
$.event.special.mousewheel = {
version: '3.1.6',
setup: function() {
if ( this.addEventListener ) {
for ( var i = toBind.length; i; ) {
this.addEventListener( toBind[--i], handler, false );
}
} else {
this.onmousewheel = handler;
}
},
teardown: function() {
if ( this.removeEventListener ) {
for ( var i = toBind.length; i; ) {
this.removeEventListener( toBind[--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,
deltaX = 0,
deltaY = 0,
absDelta = 0;
event = $.event.fix(orgEvent);
event.type = 'mousewheel';
// Old school scrollwheel delta
if ( 'detail' in orgEvent ) { deltaY = orgEvent.detail * -1; }
if ( 'wheelDelta' in orgEvent ) { deltaY = orgEvent.wheelDelta; }
if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY; }
if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
// Firefox < 17 horizontal scrolling related to DOMMouseScroll event
if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
deltaX = deltaY * -1;
deltaY = 0;
}
// Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
delta = deltaY === 0 ? deltaX : deltaY;
// New school wheel delta (wheel event)
if ( 'deltaY' in orgEvent ) {
deltaY = orgEvent.deltaY * -1;
delta = deltaY;
}
if ( 'deltaX' in orgEvent ) {
deltaX = orgEvent.deltaX;
if ( deltaY === 0 ) { delta = deltaX * -1; }
}
// No change actually happened, no reason to go any further
if ( deltaY === 0 && deltaX === 0 ) { return; }
// Store lowest absolute delta to normalize the delta values
absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
if ( !lowestDelta || absDelta < lowestDelta ) {
lowestDelta = absDelta;
}
// Get a whole, normalized value for the deltas
delta = Math[ delta >= 1 ? 'floor' : 'ceil' ](delta / lowestDelta);
deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
// Add information to the event object
event.deltaX = deltaX;
event.deltaY = deltaY;
event.deltaFactor = lowestDelta;
// Add event and delta to the front of the arguments
args.unshift(event, delta, deltaX, deltaY);
// Clearout lowestDelta after sometime to better
// handle multiple device types that give different
// a different lowestDelta
// Ex: trackpad = 3 and mouse wheel = 120
if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
return ($.event.dispatch || $.event.handle).apply(this, args);
}
function nullLowestDelta() {
lowestDelta = null;
}
}));