https://vfwauxwi.org/di/vfw/v2/assets/viewport-checker/jquery.viewportchecker.js

1/*
2    The MIT License (MIT)
3
4    Copyright (c) 2014 Dirk Groenen
5
6    Permission is hereby granted, free of charge, to any person obtaining a copy of
7    this software and associated documentation files (the "Software"), to deal in
8    the Software without restriction, including without limitation the rights to
9    use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
10    the Software, and to permit persons to whom the Software is furnished to do so,
11    subject to the following conditions:
12
13    The above copyright notice and this permission notice shall be included in all
14    copies or substantial portions of the Software.
15*/
16!function(t){t.fn.viewportChecker=function(o){var e={classToAdd:"visible",classToRemove:"invisible",classToAddForFullView:"full-visible",removeClassAfterAnimation:!1,offset:100,repeat:!1,invertBottomOffset:!0,callbackFunction:function(t,o){},scrollHorizontal:!1,scrollBox:window};t.extend(e,o);var a=this,s={height:t(e.scrollBox).height(),width:t(e.scrollBox).width()};return this.checkElements=function(){var o,l;e.scrollHorizontal?(o=Math.max(t("html").scrollLeft(),t("body").scrollLeft(),t(window).scrollLeft()),l=o+s.width):(o=Math.max(t("html").scrollTop(),t("body").scrollTop(),t(window).scrollTop()),l=o+s.height),a.each(function(){var a=t(this),i={},n={};if(a.data("vp-add-class")&&(n.classToAdd=a.data("vp-add-class")),a.data("vp-remove-class")&&(n.classToRemove=a.data("vp-remove-class")),a.data("vp-add-class-full-view")&&(n.classToAddForFullView=a.data("vp-add-class-full-view")),a.data("vp-keep-add-class")&&(n.removeClassAfterAnimation=a.data("vp-remove-after-animation")),a.data("vp-offset")&&(n.offset=a.data("vp-offset")),a.data("vp-repeat")&&(n.repeat=a.data("vp-repeat")),a.data("vp-scrollHorizontal")&&(n.scrollHorizontal=a.data("vp-scrollHorizontal")),a.data("vp-invertBottomOffset")&&(n.scrollHorizontal=a.data("vp-invertBottomOffset")),t.extend(i,e),t.extend(i,n),!a.data("vp-animated")||i.repeat){String(i.offset).indexOf("%")>0&&(i.offset=parseInt(i.offset)/100*s.height);var d=i.scrollHorizontal?a.offset().left:a.offset().top,r=i.scrollHorizontal?d+a.width():d+a.height(),c=Math.round(d)+i.offset,h=i.scrollHorizontal?c+a.width():c+a.height();i.invertBottomOffset&&(h-=2*i.offset),c<l&&h>o?(a.removeClass(i.classToRemove),a.addClass(i.classToAdd),i.callbackFunction(a,"add"),r<=l&&d>=o?a.addClass(i.classToAddForFullView):a.removeClass(i.classToAddForFullView),a.data("vp-animated",!0),i.removeClassAfterAnimation&&a.one("webkitAnimationEnd mozAnimationEnd MSAnimationEnd oanimationend animationend",function(){a.removeClass(i.classToAdd)})):a.hasClass(i.classToAdd)&&i.repeat&&(a.removeClass(i.classToAdd+" "+i.classToAddForFullView),i.callbackFunction(a,"remove"),a.data("vp-animated",!1))}})},("ontouchstart"in window||"onmsgesturechange"in window)&&t(document).bind("touchmove MSPointerMove pointermove",this.checkElements),t(e.scrollBox).bind("load scroll",this.checkElements),t(window).resize(function(o){s={height:t(e.scrollBox).height(),width:t(e.scrollBox).width()},a.checkElements()}),this.checkElements(),this}}(jQuery);