Template:Lanzhou/ZOOMJS

/**

* zoom.js - It's the best way to zoom an image
* @version v0.0.1
* @link https://github.com/fat/zoom.js
* @license MIT
*/

/* ========================================================================

* Bootstrap: transition.js v3.3.7
* http://getbootstrap.com/javascript/#transitions
* ========================================================================
* Copyright 2011-2016 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* ======================================================================== */

+function(t){"use strict";function o(){this._activeZoom=this._initialScrollPosition=this._initialTouchPosition=this._touchMoveListener=null,this._$document=t(document),this._$window=t(window),this._$body=t(document.body)}function i(o){this._fullHeight=this._fullWidth=this._overlay=this._targetImageWrap=null,this._targetImage=o,this._$body=t(document.body)}o.prototype.listen=function(){this._$body.on("click",'[data-action="zoom"]',t.proxy(this._zoom,this))},o.prototype._zoom=function(o){var e=o.target;!e||"IMG"!=e.tagName||e.width>=window.innerWidth-i.OFFSET||(this._activeZoomClose(!0),this._activeZoom=new i(e),this._activeZoom.zoomImage(),this._$window.on("scroll.zoom",t.proxy(this._scrollHandler,this)),this._$document.on("click.zoom",t.proxy(this._clickHandler,this)),this._$document.on("keyup.zoom",t.proxy(this._keyHandler,this)),this._$document.on("touchstart.zoom",t.proxy(this._touchStart,this)),o.stopPropagation())},o.prototype._activeZoomClose=function(t){this._activeZoom&&(t?this._activeZoom.dispose():this._activeZoom.close(),this._$window.off(".zoom"),this._$document.off(".zoom"),this._activeZoom=null)},o.prototype._scrollHandler=function(t){null===this._initialScrollPosition&&(this._initialScrollPosition=window.scrollY);var o=this._initialScrollPosition-window.scrollY;Math.abs(o)>=40&&this._activeZoomClose()},o.prototype._keyHandler=function(t){27==t.keyCode&&this._activeZoomClose()},o.prototype._clickHandler=function(t){t.stopPropagation(),t.preventDefault(),this._activeZoomClose()},o.prototype._touchStart=function(o){this._initialTouchPosition=o.touches[0].pageY,t(o.target).on("touchmove.zoom",t.proxy(this._touchMove,this))},o.prototype._touchMove=function(o){Math.abs(o.touches[0].pageY-this._initialTouchPosition)>10&&(this._activeZoomClose(),t(o.target).off("touchmove.zoom"))},i.OFFSET=80,i._MAX_WIDTH=2560,i._MAX_HEIGHT=4096,i.prototype.zoomImage=function(){var o=document.createElement("img");o.onload=t.proxy(function(){this._fullHeight=Number(o.height),this._fullWidth=Number(o.width),this._zoomOriginal()},this),o.src=this._targetImage.src},i.prototype._zoomOriginal=function(){this._targetImageWrap=document.createElement("div"),this._targetImageWrap.className="zoom-img-wrap",this._targetImage.parentNode.insertBefore(this._targetImageWrap,this._targetImage),this._targetImageWrap.appendChild(this._targetImage),t(this._targetImage).addClass("zoom-img").attr("data-action","zoom-out"),this._overlay=document.createElement("div"),this._overlay.className="zoom-overlay",document.body.appendChild(this._overlay),this._calculateZoom(),this._triggerAnimation()},i.prototype._calculateZoom=function(){this._targetImage.offsetWidth;var t=this._fullWidth,o=this._fullHeight,e=(window.scrollY,t/this._targetImage.width),a=window.innerHeight-i.OFFSET,s=window.innerWidth-i.OFFSET,r=t/o,n=s/a;this._imgScaleFactor=s>t&&a>o?e:n>r?a/o*e:s/t*e},i.prototype._triggerAnimation=function(){this._targetImage.offsetWidth;var o=t(this._targetImage).offset(),i=window.scrollY,e=i+window.innerHeight/2,a=window.innerWidth/2,s=o.top+this._targetImage.height/2,r=o.left+this._targetImage.width/2;this._translateY=e-s,this._translateX=a-r,t(this._targetImage).css("transform","scale("+this._imgScaleFactor+")"),t(this._targetImageWrap).css("transform","translate("+this._translateX+"px, "+this._translateY+"px) translateZ(0)"),this._$body.addClass("zoom-overlay-open")},i.prototype.close=function(){this._$body.removeClass("zoom-overlay-open").addClass("zoom-overlay-transitioning"),t(this._targetImage).css("transform",""),t(this._targetImageWrap).css("transform",""),t(this._targetImage).one(t.support.transition.end,t.proxy(this.dispose,this)).emulateTransitionEnd(300)},i.prototype.dispose=function(){this._targetImageWrap&&this._targetImageWrap.parentNode&&(t(this._targetImage).removeClass("zoom-img").attr("data-action","zoom"),this._targetImageWrap.parentNode.replaceChild(this._targetImage,this._targetImageWrap),this._overlay.parentNode.removeChild(this._overlay),this._$body.removeClass("zoom-overlay-transitioning"))},(new o).listen()}(jQuery);