/*!
* jQuery Mousewheel v3.2.0
* https://github.com/jquery/jquery-mousewheel
*/
( 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 window.document || window.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;
}
}
var special = $.event.special.mousewheel = {
version: "3.2.0",
setup: function() {
if ( this.addEventListener ) {
for ( var i = toBind.length; i; ) {
this.addEventListener( toBind[ --i ], handler, false );
}
} else {
this.onmousewheel = handler;
}
// Store the line height and page height for this particular element
$.data( this, "mousewheel-line-height", special.getLineHeight( this ) );
$.data( this, "mousewheel-page-height", special.getPageHeight( this ) );
},
teardown: function() {
if ( this.removeEventListener ) {
for ( var i = toBind.length; i; ) {
this.removeEventListener( toBind[ --i ], handler, false );
}
} else {
this.onmousewheel = null;
}
// Clean up the data we added to the element
$.removeData( this, "mousewheel-line-height" );
$.removeData( this, "mousewheel-page-height" );
},
getLineHeight: function( elem ) {
var $elem = $( elem ),
$parent = $elem[ "offsetParent" in $.fn ? "offsetParent" : "parent" ]();
if ( !$parent.length ) {
$parent = $( "body" );
}
return parseInt( $parent.css( "fontSize" ), 10 ) ||
parseInt( $elem.css( "fontSize" ), 10 ) || 16;
},
getPageHeight: function( elem ) {
return $( elem ).height();
},
settings: {
adjustOldDeltas: true, // see shouldAdjustOldDeltas() below
normalizeOffset: true // calls getBoundingClientRect for each event
}
};
$.fn.extend( {
mousewheel: function( fn ) {
return fn ? this.on( "mousewheel", fn ) : this.trigger( "mousewheel" );
},
unmousewheel: function( fn ) {
return this.off( "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;
}
// Need to convert lines and pages to pixels if we aren't already in pixels
// There are three delta modes:
// * deltaMode 0 is by pixels, nothing to do
// * deltaMode 1 is by lines
// * deltaMode 2 is by pages
if ( orgEvent.deltaMode === 1 ) {
var lineHeight = $.data( this, "mousewheel-line-height" );
delta *= lineHeight;
deltaY *= lineHeight;
deltaX *= lineHeight;
} else if ( orgEvent.deltaMode === 2 ) {
var pageHeight = $.data( this, "mousewheel-page-height" );
delta *= pageHeight;
deltaY *= pageHeight;
deltaX *= pageHeight;
}
// Store lowest absolute delta to normalize the delta values
absDelta = Math.max( Math.abs( deltaY ), Math.abs( deltaX ) );
if ( !lowestDelta || absDelta < lowestDelta ) {
lowestDelta = absDelta;
// Adjust older deltas if necessary
if ( shouldAdjustOldDeltas( orgEvent, absDelta ) ) {
lowestDelta /= 40;
}
}
// Adjust older deltas if necessary
if ( shouldAdjustOldDeltas( orgEvent, absDelta ) ) {
// Divide all the things by 40!
delta /= 40;
deltaX /= 40;
deltaY /= 40;
}
// 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 );
// Normalise offsetX and offsetY properties
if ( special.settings.normalizeOffset && this.getBoundingClientRect ) {
var boundingRect = this.getBoundingClientRect();
event.offsetX = event.clientX - boundingRect.left;
event.offsetY = event.clientY - boundingRect.top;
}
// Add information to the event object
event.deltaX = deltaX;
event.deltaY = deltaY;
event.deltaFactor = lowestDelta;
// Go ahead and set deltaMode to 0 since we converted to pixels
// Although this is a little odd since we overwrite the deltaX/Y
// properties with normalized deltas.
event.deltaMode = 0;
// 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 ) {
window.clearTimeout( nullLowestDeltaTimeout );
}
nullLowestDeltaTimeout = window.setTimeout( nullLowestDelta, 200 );
return ( $.event.dispatch || $.event.handle ).apply( this, args );
}
function nullLowestDelta() {
lowestDelta = null;
}
function shouldAdjustOldDeltas( orgEvent, absDelta ) {
// If this is an older event and the delta is divisable by 120,
// then we are assuming that the browser is treating this as an
// older mouse wheel event and that we should divide the deltas
// by 40 to try and get a more usable deltaFactor.
// Side note, this actually impacts the reported scroll distance
// in older browsers and can cause scrolling to be slower than native.
// Turn this off by setting $.event.special.mousewheel.settings.adjustOldDeltas to false.
return special.settings.adjustOldDeltas && orgEvent.type === "mousewheel" &&
absDelta % 120 === 0;
}
} );
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