docsify/lib/plugins/zoom-image.js

(function () {
/*
 * medium-zoom v0.4.0
 * Medium zoom on your images in vanilla JavaScript
 * Copyright 2018 Francois Chalifour
 * https://github.com/francoischalifour/medium-zoom
 * MIT License
 */var _extends=Object.assign||function(a){for(var b,c=1;c<arguments.length;c++){ for(var d in b=arguments[c], b){ Object.prototype.hasOwnProperty.call(b,d)&&(a[d]=b[d]); } }return a};
 var SUPPORTED_FORMATS=['IMG'];
 var KEY_ESC=27;
 var KEY_Q=81;
 var CANCEL_KEYS=[KEY_ESC,KEY_Q];
 var isSupported=function(a){return-1<SUPPORTED_FORMATS.indexOf(a.tagName)};
 var isScaled=function(a){return a.naturalWidth!==a.width};
 var isListOrCollection=function(a){return NodeList.prototype.isPrototypeOf(a)||HTMLCollection.prototype.isPrototypeOf(a)};
 var isNode=function(a){return a&&1===a.nodeType};
 var mediumZoom=function(a){var b=1<arguments.length&&void 0!==arguments[1]?arguments[1]:{},c=b.margin,d=void 0===c?0:c,e=b.background,f=void 0===e?'#fff':e,g=b.scrollOffset,h=void 0===g?48:g,i=b.metaClick,j=b.container,k=b.template,l=function(a){var b=a.getBoundingClientRect(),c=b.top,d=b.left,e=b.width,f=b.height,g=a.cloneNode(),h=window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop||0,i=window.pageXOffset||document.documentElement.scrollLeft||document.body.scrollLeft||0;return g.removeAttribute('id'), g.style.position='absolute', g.style.top=c+h+'px', g.style.left=d+i+'px', g.style.width=e+'px', g.style.height=f+'px', g.style.transform='', g},m=function(a){var b=1<arguments.length&&void 0!==arguments[1]?arguments[1]:{bubbles:!1,cancelable:!1,detail:void 0};if('function'==typeof window.CustomEvent){ return new CustomEvent(a,b); }var c=document.createEvent('CustomEvent');return c.initCustomEvent(a,b.bubbles,b.cancelable,b.detail), c},n=function(){if(z.original){if(z.original.dispatchEvent(m('show')), A=window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop||0, B=!0, z.zoomed=l(z.original), document.body.appendChild(y), w.template){var a=isNode(w.template)?w.template:document.querySelector(w.template);z.template=document.createElement('div'), z.template.appendChild(a.content.cloneNode(!0)), document.body.appendChild(z.template);}if(document.body.appendChild(z.zoomed), requestAnimationFrame(function(){document.body.classList.add('medium-zoom--open');}), z.original.style.visibility='hidden', z.zoomed.classList.add('medium-zoom-image--open'), z.zoomed.addEventListener('click',o), z.zoomed.addEventListener('transitionend',r), z.original.getAttribute('data-zoom-target')){z.zoomedHd=z.zoomed.cloneNode(), z.zoomedHd.src=z.zoomed.getAttribute('data-zoom-target'), z.zoomedHd.onerror=function(){clearInterval(b), console.error('Unable to reach the zoom image target '+z.zoomedHd.src), z.zoomedHd=null, v();};var b=setInterval(function(){z.zoomedHd.naturalWidth&&(clearInterval(b), z.zoomedHd.classList.add('medium-zoom-image--open'), z.zoomedHd.addEventListener('click',o), document.body.appendChild(z.zoomedHd), v());},10);}else { v(); }}},o=function a(){var b=0<arguments.length&&void 0!==arguments[0]?arguments[0]:0,c=function(){B||!z.original||(z.original.dispatchEvent(m('hide')), B=!0, document.body.classList.remove('medium-zoom--open'), z.zoomed.style.transform='', z.zoomedHd&&(z.zoomedHd.style.transform='', z.zoomedHd.removeEventListener('click',a)), z.template&&(z.template.style.transition='opacity 150ms', z.template.style.opacity=0), z.zoomed.removeEventListener('click',a), z.zoomed.addEventListener('transitionend',s));};0<b?setTimeout(c,b):c();},p=function(a){a&&a.target?(z.original=a.target, n()):z.original?o():(z.original=x[0], n());},q=function(a){return(a.metaKey||a.ctrlKey)&&w.metaClick?window.open(a.target.getAttribute('data-original')||a.target.parentNode.href||a.target.src,'_blank'):void(a.preventDefault(), p(a))},r=function a(){B=!1, z.zoomed.removeEventListener('transitionend',a), z.original.dispatchEvent(m('shown'));},s=function a(){z.original&&(z.original.style.visibility='', document.body.removeChild(z.zoomed), z.zoomedHd&&document.body.removeChild(z.zoomedHd), document.body.removeChild(y), z.zoomed.classList.remove('medium-zoom-image--open'), z.template&&document.body.removeChild(z.template), B=!1, z.zoomed.removeEventListener('transitionend',a), z.original.dispatchEvent(m('hidden')), z.original=null, z.zoomed=null, z.zoomedHd=null, z.template=null);},t=function(){if(!B&&z.original){var a=window.pageYOffset||document.documentElement.scrollTop||document.body.scrollTop||0;Math.abs(A-a)>w.scrollOffset&&o(150);}},u=function(a){-1<CANCEL_KEYS.indexOf(a.keyCode||a.which)&&o();},v=function(){var a=Math.min;if(z.original){var b,c,d={width:window.innerWidth,height:window.innerHeight,left:0,top:0,right:0,bottom:0};if(w.container){ if(w.container instanceof Object){ _extends(d,w.container), b=d.width-d.left-d.right-2*w.margin, c=d.height-d.top-d.bottom-2*w.margin; }else{var e=isNode(w.container)?w.container:document.querySelector(w.container),f=e.getBoundingClientRect(),g=f.width,h=f.height,i=f.left,j=f.top;_extends(d,{width:g,height:h,left:i,top:j});} }b=b||d.width-2*w.margin, c=c||d.height-2*w.margin;var k=z.zoomedHd||z.original,l=k.naturalWidth,m=void 0===l?b:l,n=k.naturalHeight,o=void 0===n?c:n,p=k.getBoundingClientRect(),q=p.top,r=p.left,s=p.width,t=p.height,u=a(m,b)/s,v=a(o,c)/t,x=a(u,v)||1,y=(-r+(b-s)/2+w.margin+d.left)/x,A=(-q+(c-t)/2+w.margin+d.top)/x,B='scale('+x+') translate3d('+y+'px, '+A+'px, 0)';z.zoomed.style.transform=B, z.zoomedHd&&(z.zoomedHd.style.transform=B);}},w={margin:d,background:f,scrollOffset:h,metaClick:void 0===i||i,container:j,template:k};a instanceof Object&&_extends(w,a);var x=function(a){try{return Array.isArray(a)?a.filter(isSupported):isListOrCollection(a)?Array.apply(null,a).filter(isSupported):isNode(a)?[a].filter(isSupported):'string'==typeof a?Array.apply(null,document.querySelectorAll(a)).filter(isSupported):Array.apply(null,document.querySelectorAll(SUPPORTED_FORMATS.map(function(a){return a.toLowerCase()}).join(','))).filter(isScaled)}catch(a){throw new TypeError('The provided selector is invalid.\nExpects a CSS selector, a Node element, a NodeList, an HTMLCollection or an array.\nSee: https://github.com/francoischalifour/medium-zoom')}}(a),y=function(a){var b=document.createElement('div');return b.classList.add('medium-zoom-overlay'), b.style.backgroundColor=a, b}(w.background),z={original:null,zoomed:null,zoomedHd:null,template:null},A=0,B=!1;return x.forEach(function(a){a.classList.add('medium-zoom-image'), a.addEventListener('click',q);}), y.addEventListener('click',o), document.addEventListener('scroll',t), document.addEventListener('keyup',u), window.addEventListener('resize',o), {show:p,hide:o,toggle:p,update:function(){var a=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};return a.background&&(y.style.backgroundColor=a.background), a.container&&a.container instanceof Object&&(a.container=_extends({},w.container,a.container)), _extends(w,a)},addEventListeners:function(a,b){x.forEach(function(c){c.addEventListener(a,b);});},detach:function(){z.zoomed&&o();var a=m('detach');x.forEach(function(b){b.classList.remove('medium-zoom-image'), b.removeEventListener('click',q), b.dispatchEvent(a);}), x.splice(0,x.length), y.removeEventListener('click',o), document.removeEventListener('scroll',t), document.removeEventListener('keyup',u), window.removeEventListener('resize',o);},images:x,options:w}};
 var mediumZoom$1=Object.freeze({default:mediumZoom});function styleInject(a,b){void 0===b&&(b={});var c=b.insertAt;if(a&&'undefined'!=typeof document){var d=document.head||document.getElementsByTagName('head')[0],e=document.createElement('style');e.type='text/css', 'top'===c?d.firstChild?d.insertBefore(e,d.firstChild):d.appendChild(e):d.appendChild(e), e.styleSheet?e.styleSheet.cssText=a:e.appendChild(document.createTextNode(a));}}var css='.medium-zoom-overlay{position:fixed;top:0;right:0;bottom:0;left:0;opacity:0;transition:opacity .3s;will-change:opacity}.medium-zoom--open .medium-zoom-overlay{cursor:pointer;cursor:zoom-out;opacity:1}.medium-zoom-image{cursor:pointer;cursor:zoom-in;transition:transform .3s}.medium-zoom-image--open{position:relative;cursor:pointer;cursor:zoom-out;will-change:transform}';styleInject(css);var mediumZoom$2=mediumZoom$1&&mediumZoom||mediumZoom$1; var src=mediumZoom$2;

var matchesSelector = Element.prototype.matches || Element.prototype.webkitMatchesSelector || Element.prototype.msMatchesSelector;

function install(hook) {
  var zoom;

  hook.doneEach(function (_) {
    var elms = Array.apply(null, document.querySelectorAll('.markdown-section img:not(.emoji):not([data-no-zoom])'));

    elms = elms.filter(function (elm) { return matchesSelector.call(elm, 'a img') === false; });

    if (zoom) {
      zoom.detach();
    }

    zoom = src(elms);
  });
}

$docsify.plugins = [].concat(install, $docsify.plugins);

}());