lightGallery Zoom plugin

assets/js/lg-zoom.min.js

+/*! lg-zoom - v1.0.4 - 2016-12-20
+* http://sachinchoolur.github.io/lightGallery
+* Copyright (c) 2016 Sachin N; Licensed GPLv3 */
+!function(a,b){"function"==typeof define&&define.amd?define(["jquery"],function(a){return b(a)}):"object"==typeof exports?module.exports=b(require("jquery")):b(jQuery)}(this,function(a){!function(){"use strict";var b=function(){var a=!1,b=navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);return b&&parseInt(b[2],10)<54&&(a=!0),a},c={scale:1,zoom:!0,actualSize:!0,enableZoomAfter:300,useLeftForZoom:b()},d=function(b){return this.core=a(b).data("lightGallery"),this.core.s=a.extend({},c,this.core.s),this.core.s.zoom&&this.core.doCss()&&(this.init(),this.zoomabletimeout=!1,this.pageX=a(window).width()/2,this.pageY=a(window).height()/2+a(window).scrollTop()),this};d.prototype.init=function(){var b=this,c='<span id="lg-zoom-in" class="lg-icon"></span><span id="lg-zoom-out" class="lg-icon"></span>';b.core.s.actualSize&&(c+='<span id="lg-actual-size" class="lg-icon"></span>'),b.core.s.useLeftForZoom?b.core.$outer.addClass("lg-use-left-for-zoom"):b.core.$outer.addClass("lg-use-transition-for-zoom"),this.core.$outer.find(".lg-toolbar").append(c),b.core.$el.on("onSlideItemLoad.lg.tm.zoom",function(c,d,e){var f=b.core.s.enableZoomAfter+e;a("body").hasClass("lg-from-hash")&&e?f=0:a("body").removeClass("lg-from-hash"),b.zoomabletimeout=setTimeout(function(){b.core.$slide.eq(d).addClass("lg-zoomable")},f+30)});var d=1,e=function(c){var d,e,f=b.core.$outer.find(".lg-current .lg-image"),g=(a(window).width()-f.prop("offsetWidth"))/2,h=(a(window).height()-f.prop("offsetHeight"))/2+a(window).scrollTop();d=b.pageX-g,e=b.pageY-h;var i=(c-1)*d,j=(c-1)*e;f.css("transform","scale3d("+c+", "+c+", 1)").attr("data-scale",c),b.core.s.useLeftForZoom?f.parent().css({left:-i+"px",top:-j+"px"}).attr("data-x",i).attr("data-y",j):f.parent().css("transform","translate3d(-"+i+"px, -"+j+"px, 0)").attr("data-x",i).attr("data-y",j)},f=function(){d>1?b.core.$outer.addClass("lg-zoomed"):b.resetZoom(),d<1&&(d=1),e(d)},g=function(c,e,g,h){var i,j=e.prop("offsetWidth");i=b.core.s.dynamic?b.core.s.dynamicEl[g].width||e[0].naturalWidth||j:b.core.$items.eq(g).attr("data-width")||e[0].naturalWidth||j;var k;b.core.$outer.hasClass("lg-zoomed")?d=1:i>j&&(k=i/j,d=k||2),h?(b.pageX=a(window).width()/2,b.pageY=a(window).height()/2+a(window).scrollTop()):(b.pageX=c.pageX||c.originalEvent.targetTouches[0].pageX,b.pageY=c.pageY||c.originalEvent.targetTouches[0].pageY),f(),setTimeout(function(){b.core.$outer.removeClass("lg-grabbing").addClass("lg-grab")},10)},h=!1;b.core.$el.on("onAferAppendSlide.lg.tm.zoom",function(a,c){var d=b.core.$slide.eq(c).find(".lg-image");d.on("dblclick",function(a){g(a,d,c)}),d.on("touchstart",function(a){h?(clearTimeout(h),h=null,g(a,d,c)):h=setTimeout(function(){h=null},300),a.preventDefault()})}),a(window).on("resize.lg.zoom scroll.lg.zoom orientationchange.lg.zoom",function(){b.pageX=a(window).width()/2,b.pageY=a(window).height()/2+a(window).scrollTop(),e(d)}),a("#lg-zoom-out").on("click.lg",function(){b.core.$outer.find(".lg-current .lg-image").length&&(d-=b.core.s.scale,f())}),a("#lg-zoom-in").on("click.lg",function(){b.core.$outer.find(".lg-current .lg-image").length&&(d+=b.core.s.scale,f())}),a("#lg-actual-size").on("click.lg",function(a){g(a,b.core.$slide.eq(b.core.index).find(".lg-image"),b.core.index,!0)}),b.core.$el.on("onBeforeSlide.lg.tm",function(){d=1,b.resetZoom()}),b.core.isTouch||b.zoomDrag(),b.core.isTouch&&b.zoomSwipe()},d.prototype.resetZoom=function(){this.core.$outer.removeClass("lg-zoomed"),this.core.$slide.find(".lg-img-wrap").removeAttr("style data-x data-y"),this.core.$slide.find(".lg-image").removeAttr("style data-scale"),this.pageX=a(window).width()/2,this.pageY=a(window).height()/2+a(window).scrollTop()},d.prototype.zoomSwipe=function(){var a=this,b={},c={},d=!1,e=!1,f=!1;a.core.$slide.on("touchstart.lg",function(c){if(a.core.$outer.hasClass("lg-zoomed")){var d=a.core.$slide.eq(a.core.index).find(".lg-object");f=d.prop("offsetHeight")*d.attr("data-scale")>a.core.$outer.find(".lg").height(),e=d.prop("offsetWidth")*d.attr("data-scale")>a.core.$outer.find(".lg").width(),(e||f)&&(c.preventDefault(),b={x:c.originalEvent.targetTouches[0].pageX,y:c.originalEvent.targetTouches[0].pageY})}}),a.core.$slide.on("touchmove.lg",function(g){if(a.core.$outer.hasClass("lg-zoomed")){var h,i,j=a.core.$slide.eq(a.core.index).find(".lg-img-wrap");g.preventDefault(),d=!0,c={x:g.originalEvent.targetTouches[0].pageX,y:g.originalEvent.targetTouches[0].pageY},a.core.$outer.addClass("lg-zoom-dragging"),i=f?-Math.abs(j.attr("data-y"))+(c.y-b.y):-Math.abs(j.attr("data-y")),h=e?-Math.abs(j.attr("data-x"))+(c.x-b.x):-Math.abs(j.attr("data-x")),(Math.abs(c.x-b.x)>15||Math.abs(c.y-b.y)>15)&&(a.core.s.useLeftForZoom?j.css({left:h+"px",top:i+"px"}):j.css("transform","translate3d("+h+"px, "+i+"px, 0)"))}}),a.core.$slide.on("touchend.lg",function(){a.core.$outer.hasClass("lg-zoomed")&&d&&(d=!1,a.core.$outer.removeClass("lg-zoom-dragging"),a.touchendZoom(b,c,e,f))})},d.prototype.zoomDrag=function(){var b=this,c={},d={},e=!1,f=!1,g=!1,h=!1;b.core.$slide.on("mousedown.lg.zoom",function(d){var f=b.core.$slide.eq(b.core.index).find(".lg-object");h=f.prop("offsetHeight")*f.attr("data-scale")>b.core.$outer.find(".lg").height(),g=f.prop("offsetWidth")*f.attr("data-scale")>b.core.$outer.find(".lg").width(),b.core.$outer.hasClass("lg-zoomed")&&a(d.target).hasClass("lg-object")&&(g||h)&&(d.preventDefault(),c={x:d.pageX,y:d.pageY},e=!0,b.core.$outer.scrollLeft+=1,b.core.$outer.scrollLeft-=1,b.core.$outer.removeClass("lg-grab").addClass("lg-grabbing"))}),a(window).on("mousemove.lg.zoom",function(a){if(e){var i,j,k=b.core.$slide.eq(b.core.index).find(".lg-img-wrap");f=!0,d={x:a.pageX,y:a.pageY},b.core.$outer.addClass("lg-zoom-dragging"),j=h?-Math.abs(k.attr("data-y"))+(d.y-c.y):-Math.abs(k.attr("data-y")),i=g?-Math.abs(k.attr("data-x"))+(d.x-c.x):-Math.abs(k.attr("data-x")),b.core.s.useLeftForZoom?k.css({left:i+"px",top:j+"px"}):k.css("transform","translate3d("+i+"px, "+j+"px, 0)")}}),a(window).on("mouseup.lg.zoom",function(a){e&&(e=!1,b.core.$outer.removeClass("lg-zoom-dragging"),!f||c.x===d.x&&c.y===d.y||(d={x:a.pageX,y:a.pageY},b.touchendZoom(c,d,g,h)),f=!1),b.core.$outer.removeClass("lg-grabbing").addClass("lg-grab")})},d.prototype.touchendZoom=function(a,b,c,d){var e=this,f=e.core.$slide.eq(e.core.index).find(".lg-img-wrap"),g=e.core.$slide.eq(e.core.index).find(".lg-object"),h=-Math.abs(f.attr("data-x"))+(b.x-a.x),i=-Math.abs(f.attr("data-y"))+(b.y-a.y),j=(e.core.$outer.find(".lg").height()-g.prop("offsetHeight"))/2,k=Math.abs(g.prop("offsetHeight")*Math.abs(g.attr("data-scale"))-e.core.$outer.find(".lg").height()+j),l=(e.core.$outer.find(".lg").width()-g.prop("offsetWidth"))/2,m=Math.abs(g.prop("offsetWidth")*Math.abs(g.attr("data-scale"))-e.core.$outer.find(".lg").width()+l);(Math.abs(b.x-a.x)>15||Math.abs(b.y-a.y)>15)&&(d&&(i<=-k?i=-k:i>=-j&&(i=-j)),c&&(h<=-m?h=-m:h>=-l&&(h=-l)),d?f.attr("data-y",Math.abs(i)):i=-Math.abs(f.attr("data-y")),c?f.attr("data-x",Math.abs(h)):h=-Math.abs(f.attr("data-x")),e.core.s.useLeftForZoom?f.css({left:h+"px",top:i+"px"}):f.css("transform","translate3d("+h+"px, "+i+"px, 0)"))},d.prototype.destroy=function(){var b=this;b.core.$el.off(".lg.zoom"),a(window).off(".lg.zoom"),b.core.$slide.off(".lg.zoom"),b.core.$el.off(".lg.tm.zoom"),b.resetZoom(),clearTimeout(b.zoomabletimeout),b.zoomabletimeout=!1},a.fn.lightGallery.modules.zoom=d}()});
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