141 lines
4.6 KiB
JavaScript
141 lines
4.6 KiB
JavaScript
/*! Copyright (c) 2013 Brandon Aaron (http://brandon.aaron.sh)
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* Licensed under the MIT License (LICENSE.txt).
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*
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* Version: 3.1.6
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*
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* Requires: jtQuery 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(jtQuery);
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}
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}(function ($) {
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var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll', 'MozMousePixelScroll'],
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toBind = ( 'onwheel' in document || document.documentMode >= 9 ) ?
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['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'],
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slice = Array.prototype.slice,
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nullLowestDeltaTimeout, lowestDelta;
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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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version: '3.1.6',
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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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event = $.event.fix(orgEvent);
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event.type = 'mousewheel';
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// Old school scrollwheel delta
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if ( 'detail' in orgEvent ) { deltaY = orgEvent.detail * -1; }
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if ( 'wheelDelta' in orgEvent ) { deltaY = orgEvent.wheelDelta; }
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if ( 'wheelDeltaY' in orgEvent ) { deltaY = orgEvent.wheelDeltaY; }
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if ( 'wheelDeltaX' in orgEvent ) { deltaX = orgEvent.wheelDeltaX * -1; }
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// Firefox < 17 horizontal scrolling related to DOMMouseScroll event
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if ( 'axis' in orgEvent && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
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deltaX = deltaY * -1;
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deltaY = 0;
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}
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// Set delta to be deltaY or deltaX if deltaY is 0 for backwards compatabilitiy
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delta = deltaY === 0 ? deltaX : deltaY;
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// New school wheel delta (wheel event)
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if ( 'deltaY' in orgEvent ) {
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deltaY = orgEvent.deltaY * -1;
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delta = deltaY;
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}
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if ( 'deltaX' in orgEvent ) {
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deltaX = orgEvent.deltaX;
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if ( deltaY === 0 ) { delta = deltaX * -1; }
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}
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// No change actually happened, no reason to go any further
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if ( deltaY === 0 && deltaX === 0 ) { return; }
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// Store lowest absolute delta to normalize the delta values
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absDelta = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
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if ( !lowestDelta || absDelta < lowestDelta ) {
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lowestDelta = absDelta;
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}
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// Get a whole, normalized value for the deltas
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delta = Math[ delta >= 1 ? 'floor' : 'ceil' ](delta / lowestDelta);
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deltaX = Math[ deltaX >= 1 ? 'floor' : 'ceil' ](deltaX / lowestDelta);
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deltaY = Math[ deltaY >= 1 ? 'floor' : 'ceil' ](deltaY / lowestDelta);
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// Add information to the event object
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event.deltaX = deltaX;
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event.deltaY = deltaY;
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event.deltaFactor = lowestDelta;
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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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// Clearout lowestDelta after sometime to better
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// handle multiple device types that give different
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// a different lowestDelta
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// Ex: trackpad = 3 and mouse wheel = 120
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if (nullLowestDeltaTimeout) { clearTimeout(nullLowestDeltaTimeout); }
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nullLowestDeltaTimeout = setTimeout(nullLowestDelta, 200);
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return ($.event.dispatch || $.event.handle).apply(this, args);
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}
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function nullLowestDelta() {
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lowestDelta = null;
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}
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}));
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