Hyunje Alex Jun
10 years ago
parent
a63c136c09
commit
cbdccf9736
File diff suppressed because one or more lines are too long
File diff suppressed because one or more lines are too long
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/*! 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: 3.1.9
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*
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* Requires: jQuery 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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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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var special = $.event.special.mousewheel = {
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version: '3.1.9',
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setup: function() {
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if ( this.addEventListener ) {
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for ( var i = toBind.length; i; ) {
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this.addEventListener( toBind[--i], handler, false );
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}
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} else {
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this.onmousewheel = handler;
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}
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// Store the line height and page height for this particular element
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$.data(this, 'mousewheel-line-height', special.getLineHeight(this));
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$.data(this, 'mousewheel-page-height', special.getPageHeight(this));
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},
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teardown: function() {
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if ( this.removeEventListener ) {
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for ( var i = toBind.length; i; ) {
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this.removeEventListener( toBind[--i], handler, false );
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}
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} else {
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this.onmousewheel = null;
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}
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},
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getLineHeight: function(elem) {
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return parseInt($(elem)['offsetParent' in $.fn ? 'offsetParent' : 'parent']().css('fontSize'), 10);
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},
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getPageHeight: function(elem) {
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return $(elem).height();
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},
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settings: {
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adjustOldDeltas: true
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}
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};
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$.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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// Need to convert lines and pages to pixels if we aren't already in pixels
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// There are three delta modes:
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// * deltaMode 0 is by pixels, nothing to do
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// * deltaMode 1 is by lines
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// * deltaMode 2 is by pages
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if ( orgEvent.deltaMode === 1 ) {
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var lineHeight = $.data(this, 'mousewheel-line-height');
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delta *= lineHeight;
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deltaY *= lineHeight;
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deltaX *= lineHeight;
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} else if ( orgEvent.deltaMode === 2 ) {
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var pageHeight = $.data(this, 'mousewheel-page-height');
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delta *= pageHeight;
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deltaY *= pageHeight;
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deltaX *= pageHeight;
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}
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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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// Adjust older deltas if necessary
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if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
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lowestDelta /= 40;
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}
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}
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// Adjust older deltas if necessary
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if ( shouldAdjustOldDeltas(orgEvent, absDelta) ) {
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// Divide all the things by 40!
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delta /= 40;
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deltaX /= 40;
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deltaY /= 40;
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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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// Go ahead and set deltaMode to 0 since we converted to pixels
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// Although this is a little odd since we overwrite the deltaX/Y
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// properties with normalized deltas.
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event.deltaMode = 0;
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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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function shouldAdjustOldDeltas(orgEvent, absDelta) {
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// If this is an older event and the delta is divisable by 120,
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// then we are assuming that the browser is treating this as an
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// older mouse wheel event and that we should divide the deltas
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// by 40 to try and get a more usable deltaFactor.
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// Side note, this actually impacts the reported scroll distance
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// in older browsers and can cause scrolling to be slower than native.
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// Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
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return special.settings.adjustOldDeltas && orgEvent.type === 'mousewheel' && absDelta % 120 === 0;
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}
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}));
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