jquery.trackpad-scroll-emulator.min.js

/*!
 * TrackpadScrollEmulator
 * Version: 1.0.8
 * Author: Jonathan Nicol @f6design
 * https://github.com/jnicol/trackpad-scroll-emulator
 */
!function(a){function b(b,d){function e(){A.hasClass("horizontal")&&(D="horiz",E="scrollLeft",F="width",G="left"),A.prepend('<div class="tse-scrollbar"><div class="drag-handle"></div></div>'),v=A.find(".tse-scrollbar:first"),w=A.find(".drag-handle:first"),d.wrapContent&&B.wrap('<div class="tse-scroll-content" />'),u=A.find(".tse-scroll-content:first"),o(),d.autoHide&&A.on("mouseenter",l),w.on("mousedown",f),v.on("mousedown",i),u.on("scroll",j),k(),a(window).on("resize.trackpadScollEmulator",q),d.autoHide||m()}function f(b){b.preventDefault();var c=b.pageY;"horiz"===D&&(c=b.pageX),x=c-w.offset()[G],a(document).on("mousemove",g),a(document).on("mouseup",h)}function g(a){a.preventDefault();var b=a.pageY;"horiz"===D&&(b=a.pageX);var c=b-v.offset()[G]-x,d=c/v[F](),e=d*B[F]();u[E](e)}function h(){a(document).off("mousemove",g),a(document).off("mouseup",h)}function i(a){if(a.target!==w[0]){var b=C*u[F](),c="vert"===D?a.originalEvent.layerY:a.originalEvent.layerX,d=w.position()[G],e=d>c?u[E]()-b:u[E]()+b;u[E](e)}}function j(){l()}function k(){var a="height"===F?B.outerHeight():B.outerWidth(),b=u[E](),c=v[F](),d=c/a,e=Math.round(d*b)+2,f=Math.floor(d*(c-2))-2;a>c?(w.css("vert"===D?{top:e,height:f}:{left:e,width:f}),v.show()):v.hide()}function l(){k(),m()}function m(){w.addClass("visible"),d.autoHide&&("number"==typeof y&&window.clearTimeout(y),y=window.setTimeout(function(){n()},1e3))}function n(){w.removeClass("visible"),"number"==typeof y&&window.clearTimeout(y)}function o(){"vert"===D?(u.width(A.width()+p()),u.height(A.height())):(u.width(A.width()),u.height(A.height()+p()),B.height(A.height()))}function p(){var b=a('<div class="scrollbar-width-tester" style="width:50px;height:50px;overflow-y:scroll;position:absolute;top:-200px;left:-200px;"><div style="height:100px;"></div>');a("body").append(b);var c=a(b).innerWidth(),d=a("div",b).innerWidth();return b.remove(),c===d&&navigator.userAgent.toLowerCase().indexOf("firefox")>-1?17:c-d}function q(){o(),k()}function r(a,b){return b?void(d[a]=b):d[a]}function s(){B.insertBefore(v),v.remove(),u.remove(),B.css({height:A.height()+"px","overflow-y":"scroll"}),a(window).off("resize.trackpadScollEmulator"),t("onDestroy"),A.removeData("plugin_"+c)}function t(a){void 0!==d[a]&&d[a].call(z)}var u,v,w,x,y,z=b,A=a(b),B=A.find(".tse-content:first"),C=7/8,D="vert",E="scrollTop",F="height",G="top";return d=a.extend({},a.fn[c].defaults,d),e(),{option:r,destroy:s,recalculate:q}}var c="TrackpadScrollEmulator";a.fn[c]=function(d){if("string"==typeof arguments[0]){var e,f=arguments[0],g=Array.prototype.slice.call(arguments,1);return this.each(function(){if(!a.data(this,"plugin_"+c)||"function"!=typeof a.data(this,"plugin_"+c)[f])throw new Error("Method "+f+" does not exist on jQuery."+c);e=a.data(this,"plugin_"+c)[f].apply(this,g)}),void 0!==e?e:this}return"object"!=typeof d&&d?void 0:this.each(function(){a.data(this,"plugin_"+c)||a.data(this,"plugin_"+c,new b(this,d))})},a.fn[c].defaults={onInit:function(){},onDestroy:function(){},wrapContent:!0,autoHide:!0}}(jQuery);