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/*! PhotoSwipe - v4.1.3 - 2019-01-08
* http://photoswipe.com
* Copyright (c) 2019 Dmitry Semenov; */
(function (root, factory) {
	if (typeof define === 'function' && define.amd) {
		define(factory);
	} else if (typeof exports === 'object') {
		module.exports = factory();
	} else {
		root.PhotoSwipe = factory();
	}
})(this, function () {

	'use strict';
	var PhotoSwipe = function (template, UiClass, items, options) {

		/*>>framework-bridge*/
		/**
		 *
		 * Set of generic functions used by gallery.
		 * 
		 * You're free to modify anything here as long as functionality is kept.
		 * 
		 */
		var framework = {
			features: null,
			bind: function (target, type, listener, unbind) {
				var methodName = (unbind ? 'remove' : 'add') + 'EventListener';
				type = type.split(' ');
				for (var i = 0; i < type.length; i++) {
					if (type[i]) {
						target[methodName](type[i], listener, false);
					}
				}
			},
			isArray: function (obj) {
				return (obj instanceof Array);
			},
			createEl: function (classes, tag) {
				var el = document.createElement(tag || 'div');
				if (classes) {
					el.className = classes;
				}
				return el;
			},
			getScrollY: function () {
				var yOffset = window.pageYOffset;
				return yOffset !== undefined ? yOffset : document.documentElement.scrollTop;
			},
			unbind: function (target, type, listener) {
				framework.bind(target, type, listener, true);
			},
			removeClass: function (el, className) {
				var reg = new RegExp('(\\s|^)' + className + '(\\s|$)');
				el.className = el.className.replace(reg, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
			},
			addClass: function (el, className) {
				if (!framework.hasClass(el, className)) {
					el.className += (el.className ? ' ' : '') + className;
				}
			},
			hasClass: function (el, className) {
				return el.className && new RegExp('(^|\\s)' + className + '(\\s|$)').test(el.className);
			},
			getChildByClass: function (parentEl, childClassName) {
				var node = parentEl.firstChild;
				while (node) {
					if (framework.hasClass(node, childClassName)) {
						return node;
					}
					node = node.nextSibling;
				}
			},
			arraySearch: function (array, value, key) {
				var i = array.length;
				while (i--) {
					if (array[i][key] === value) {
						return i;
					}
				}
				return -1;
			},
			extend: function (o1, o2, preventOverwrite) {
				for (var prop in o2) {
					if (o2.hasOwnProperty(prop)) {
						if (preventOverwrite && o1.hasOwnProperty(prop)) {
							continue;
						}
						o1[prop] = o2[prop];
					}
				}
			},
			easing: {
				sine: {
					out: function (k) {
						return Math.sin(k * (Math.PI / 2));
					},
					inOut: function (k) {
						return - (Math.cos(Math.PI * k) - 1) / 2;
					}
				},
				cubic: {
					out: function (k) {
						return --k * k * k + 1;
					}
				}
				/*
					elastic: {
						out: function ( k ) {
		
							var s, a = 0.1, p = 0.4;
							if ( k === 0 ) return 0;
							if ( k === 1 ) return 1;
							if ( !a || a < 1 ) { a = 1; s = p / 4; }
							else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
							return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );
		
						},
					},
					back: {
						out: function ( k ) {
							var s = 1.70158;
							return --k * k * ( ( s + 1 ) * k + s ) + 1;
						}
					}
				*/
			},

			/**
			 * 
			 * @return {object}
			 * 
			 * {
			 *  raf : request animation frame function
			 *  caf : cancel animation frame function
			 *  transfrom : transform property key (with vendor), or null if not supported
			 *  oldIE : IE8 or below
			 * }
			 * 
			 */
			detectFeatures: function () {
				if (framework.features) {
					return framework.features;
				}
				var helperEl = framework.createEl(),
					helperStyle = helperEl.style,
					vendor = '',
					features = {};

				// IE8 and below
				features.oldIE = document.all && !document.addEventListener;

				features.touch = 'ontouchstart' in window;

				if (window.requestAnimationFrame) {
					features.raf = window.requestAnimationFrame;
					features.caf = window.cancelAnimationFrame;
				}

				features.pointerEvent = !!(window.PointerEvent) || navigator.msPointerEnabled;

				// fix false-positive detection of old Android in new IE
				// (IE11 ua string contains "Android 4.0")

				if (!features.pointerEvent) {

					var ua = navigator.userAgent;

					// Detect if device is iPhone or iPod and if it's older than iOS 8
					// http://stackoverflow.com/a/14223920
					// 
					// This detection is made because of buggy top/bottom toolbars
					// that don't trigger window.resize event.
					// For more info refer to _isFixedPosition variable in core.js

					if (/iP(hone|od)/.test(navigator.platform)) {
						var v = (navigator.appVersion).match(/OS (\d+)_(\d+)_?(\d+)?/);
						if (v && v.length > 0) {
							v = parseInt(v[1], 10);
							if (v >= 1 && v < 8) {
								features.isOldIOSPhone = true;
							}
						}
					}

					// Detect old Android (before KitKat)
					// due to bugs related to position:fixed
					// http://stackoverflow.com/questions/7184573/pick-up-the-android-version-in-the-browser-by-javascript

					var match = ua.match(/Android\s([0-9\.]*)/);
					var androidversion = match ? match[1] : 0;
					androidversion = parseFloat(androidversion);
					if (androidversion >= 1) {
						if (androidversion < 4.4) {
							features.isOldAndroid = true; // for fixed position bug & performance
						}
						features.androidVersion = androidversion; // for touchend bug
					}
					features.isMobileOpera = /opera mini|opera mobi/i.test(ua);

					// p.s. yes, yes, UA sniffing is bad, propose your solution for above bugs.
				}

				var styleChecks = ['transform', 'perspective', 'animationName'],
					vendors = ['', 'webkit', 'Moz', 'ms', 'O'],
					styleCheckItem,
					styleName;

				for (var i = 0; i < 4; i++) {
					vendor = vendors[i];

					for (var a = 0; a < 3; a++) {
						styleCheckItem = styleChecks[a];

						// uppercase first letter of property name, if vendor is present
						styleName = vendor + (vendor ?
							styleCheckItem.charAt(0).toUpperCase() + styleCheckItem.slice(1) :
							styleCheckItem);

						if (!features[styleCheckItem] && styleName in helperStyle) {
							features[styleCheckItem] = styleName;
						}
					}

					if (vendor && !features.raf) {
						vendor = vendor.toLowerCase();
						features.raf = window[vendor + 'RequestAnimationFrame'];
						if (features.raf) {
							features.caf = window[vendor + 'CancelAnimationFrame'] ||
								window[vendor + 'CancelRequestAnimationFrame'];
						}
					}
				}

				if (!features.raf) {
					var lastTime = 0;
					features.raf = function (fn) {
						var currTime = new Date().getTime();
						var timeToCall = Math.max(0, 16 - (currTime - lastTime));
						var id = window.setTimeout(function () { fn(currTime + timeToCall); }, timeToCall);
						lastTime = currTime + timeToCall;
						return id;
					};
					features.caf = function (id) { clearTimeout(id); };
				}

				// Detect SVG support
				features.svg = !!document.createElementNS &&
					!!document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect;

				framework.features = features;

				return features;
			}
		};

		framework.detectFeatures();

		// Override addEventListener for old versions of IE
		if (framework.features.oldIE) {

			framework.bind = function (target, type, listener, unbind) {

				type = type.split(' ');

				var methodName = (unbind ? 'detach' : 'attach') + 'Event',
					evName,
					_handleEv = function () {
						listener.handleEvent.call(listener);
					};

				for (var i = 0; i < type.length; i++) {
					evName = type[i];
					if (evName) {

						if (typeof listener === 'object' && listener.handleEvent) {
							if (!unbind) {
								listener['oldIE' + evName] = _handleEv;
							} else {
								if (!listener['oldIE' + evName]) {
									return false;
								}
							}

							target[methodName]('on' + evName, listener['oldIE' + evName]);
						} else {
							target[methodName]('on' + evName, listener);
						}

					}
				}
			};

		}

		/*>>framework-bridge*/

		/*>>core*/
		//function(template, UiClass, items, options)

		var self = this;

		/**
		 * Static vars, don't change unless you know what you're doing.
		 */
		var DOUBLE_TAP_RADIUS = 25,
			NUM_HOLDERS = 3;

		/**
		 * Options
		 */
		var _options = {
			allowPanToNext: true,
			spacing: 0.12,
			bgOpacity: 1,
			mouseUsed: false,
			loop: true,
			pinchToClose: true,
			closeOnScroll: true,
			closeOnVerticalDrag: true,
			verticalDragRange: 0.75,
			hideAnimationDuration: 333,
			showAnimationDuration: 333,
			showHideOpacity: false,
			focus: true,
			escKey: true,
			arrowKeys: true,
			mainScrollEndFriction: 0.35,
			panEndFriction: 0.35,
			isClickableElement: function (el) {
				return el.tagName === 'A';
			},
			getDoubleTapZoom: function (isMouseClick, item) {
				if (isMouseClick) {
					return 1;
				} else {
					return item.initialZoomLevel < 0.7 ? 1 : 1.33;
				}
			},
			maxSpreadZoom: 1.33,
			modal: true,

			// not fully implemented yet
			scaleMode: 'fit' // TODO
		};
		framework.extend(_options, options);


		/**
		 * Private helper variables & functions
		 */

		var _getEmptyPoint = function () {
			return { x: 0, y: 0 };
		};

		var _isOpen,
			_isDestroying,
			_closedByScroll,
			_currentItemIndex,
			_containerStyle,
			_containerShiftIndex,
			_currPanDist = _getEmptyPoint(),
			_startPanOffset = _getEmptyPoint(),
			_panOffset = _getEmptyPoint(),
			_upMoveEvents, // drag move, drag end & drag cancel events array
			_downEvents, // drag start events array
			_globalEventHandlers,
			_viewportSize = {},
			_currZoomLevel,
			_startZoomLevel,
			_translatePrefix,
			_translateSufix,
			_updateSizeInterval,
			_itemsNeedUpdate,
			_currPositionIndex = 0,
			_offset = {},
			_slideSize = _getEmptyPoint(), // size of slide area, including spacing
			_itemHolders,
			_prevItemIndex,
			_indexDiff = 0, // difference of indexes since last content update
			_dragStartEvent,
			_dragMoveEvent,
			_dragEndEvent,
			_dragCancelEvent,
			_transformKey,
			_pointerEventEnabled,
			_isFixedPosition = true,
			_likelyTouchDevice,
			_modules = [],
			_requestAF,
			_cancelAF,
			_initalClassName,
			_initalWindowScrollY,
			_oldIE,
			_currentWindowScrollY,
			_features,
			_windowVisibleSize = {},
			_renderMaxResolution = false,
			_orientationChangeTimeout,


			// Registers PhotoSWipe module (History, Controller ...)
			_registerModule = function (name, module) {
				framework.extend(self, module.publicMethods);
				_modules.push(name);
			},

			_getLoopedId = function (index) {
				var numSlides = _getNumItems();
				if (index > numSlides - 1) {
					return index - numSlides;
				} else if (index < 0) {
					return numSlides + index;
				}
				return index;
			},

			// Micro bind/trigger
			_listeners = {},
			_listen = function (name, fn) {
				if (!_listeners[name]) {
					_listeners[name] = [];
				}
				return _listeners[name].push(fn);
			},
			_shout = function (name) {
				var listeners = _listeners[name];

				if (listeners) {
					var args = Array.prototype.slice.call(arguments);
					args.shift();

					for (var i = 0; i < listeners.length; i++) {
						listeners[i].apply(self, args);
					}
				}
			},

			_getCurrentTime = function () {
				return new Date().getTime();
			},
			_applyBgOpacity = function (opacity) {
				_bgOpacity = opacity;
				self.bg.style.opacity = opacity * _options.bgOpacity;
			},

			_applyZoomTransform = function (styleObj, x, y, zoom, item) {
				if (!_renderMaxResolution || (item && item !== self.currItem)) {
					zoom = zoom / (item ? item.fitRatio : self.currItem.fitRatio);
				}

				styleObj[_transformKey] = _translatePrefix + x + 'px, ' + y + 'px' + _translateSufix + ' scale(' + zoom + ')';
			},
			_applyCurrentZoomPan = function (allowRenderResolution) {
				if (_currZoomElementStyle) {

					if (allowRenderResolution) {
						if (_currZoomLevel > self.currItem.fitRatio) {
							if (!_renderMaxResolution) {
								_setImageSize(self.currItem, false, true);
								_renderMaxResolution = true;
							}
						} else {
							if (_renderMaxResolution) {
								_setImageSize(self.currItem);
								_renderMaxResolution = false;
							}
						}
					}


					_applyZoomTransform(_currZoomElementStyle, _panOffset.x, _panOffset.y, _currZoomLevel);
				}
			},
			_applyZoomPanToItem = function (item) {
				if (item.container) {

					_applyZoomTransform(item.container.style,
						item.initialPosition.x,
						item.initialPosition.y,
						item.initialZoomLevel,
						item);
				}
			},
			_setTranslateX = function (x, elStyle) {
				elStyle[_transformKey] = _translatePrefix + x + 'px, 0px' + _translateSufix;
			},
			_moveMainScroll = function (x, dragging) {

				if (!_options.loop && dragging) {
					var newSlideIndexOffset = _currentItemIndex + (_slideSize.x * _currPositionIndex - x) / _slideSize.x,
						delta = Math.round(x - _mainScrollPos.x);

					if ((newSlideIndexOffset < 0 && delta > 0) ||
						(newSlideIndexOffset >= _getNumItems() - 1 && delta < 0)) {
						x = _mainScrollPos.x + delta * _options.mainScrollEndFriction;
					}
				}

				_mainScrollPos.x = x;
				_setTranslateX(x, _containerStyle);
			},
			_calculatePanOffset = function (axis, zoomLevel) {
				var m = _midZoomPoint[axis] - _offset[axis];
				return _startPanOffset[axis] + _currPanDist[axis] + m - m * (zoomLevel / _startZoomLevel);
			},

			_equalizePoints = function (p1, p2) {
				p1.x = p2.x;
				p1.y = p2.y;
				if (p2.id) {
					p1.id = p2.id;
				}
			},
			_roundPoint = function (p) {
				p.x = Math.round(p.x);
				p.y = Math.round(p.y);
			},

			_mouseMoveTimeout = null,
			_onFirstMouseMove = function () {
				// Wait until mouse move event is fired at least twice during 100ms
				// We do this, because some mobile browsers trigger it on touchstart
				if (_mouseMoveTimeout) {
					framework.unbind(document, 'mousemove', _onFirstMouseMove);
					framework.addClass(template, 'pswp--has_mouse');
					_options.mouseUsed = true;
					_shout('mouseUsed');
				}
				_mouseMoveTimeout = setTimeout(function () {
					_mouseMoveTimeout = null;
				}, 100);
			},

			_bindEvents = function () {
				framework.bind(document, 'keydown', self);

				if (_features.transform) {
					// don't bind click event in browsers that don't support transform (mostly IE8)
					framework.bind(self.scrollWrap, 'click', self);
				}


				if (!_options.mouseUsed) {
					framework.bind(document, 'mousemove', _onFirstMouseMove);
				}

				framework.bind(window, 'resize scroll orientationchange', self);

				_shout('bindEvents');
			},

			_unbindEvents = function () {
				framework.unbind(window, 'resize scroll orientationchange', self);
				framework.unbind(window, 'scroll', _globalEventHandlers.scroll);
				framework.unbind(document, 'keydown', self);
				framework.unbind(document, 'mousemove', _onFirstMouseMove);

				if (_features.transform) {
					framework.unbind(self.scrollWrap, 'click', self);
				}

				if (_isDragging) {
					framework.unbind(window, _upMoveEvents, self);
				}

				clearTimeout(_orientationChangeTimeout);

				_shout('unbindEvents');
			},

			_calculatePanBounds = function (zoomLevel, update) {
				var bounds = _calculateItemSize(self.currItem, _viewportSize, zoomLevel);
				if (update) {
					_currPanBounds = bounds;
				}
				return bounds;
			},

			_getMinZoomLevel = function (item) {
				if (!item) {
					item = self.currItem;
				}
				return item.initialZoomLevel;
			},
			_getMaxZoomLevel = function (item) {
				if (!item) {
					item = self.currItem;
				}
				return item.w > 0 ? _options.maxSpreadZoom : 1;
			},

			// Return true if offset is out of the bounds
			_modifyDestPanOffset = function (axis, destPanBounds, destPanOffset, destZoomLevel) {
				if (destZoomLevel === self.currItem.initialZoomLevel) {
					destPanOffset[axis] = self.currItem.initialPosition[axis];
					return true;
				} else {
					destPanOffset[axis] = _calculatePanOffset(axis, destZoomLevel);

					if (destPanOffset[axis] > destPanBounds.min[axis]) {
						destPanOffset[axis] = destPanBounds.min[axis];
						return true;
					} else if (destPanOffset[axis] < destPanBounds.max[axis]) {
						destPanOffset[axis] = destPanBounds.max[axis];
						return true;
					}
				}
				return false;
			},

			_setupTransforms = function () {

				if (_transformKey) {
					// setup 3d transforms
					var allow3dTransform = _features.perspective && !_likelyTouchDevice;
					_translatePrefix = 'translate' + (allow3dTransform ? '3d(' : '(');
					_translateSufix = _features.perspective ? ', 0px)' : ')';
					return;
				}

				// Override zoom/pan/move functions in case old browser is used (most likely IE)
				// (so they use left/top/width/height, instead of CSS transform)

				_transformKey = 'left';
				framework.addClass(template, 'pswp--ie');

				_setTranslateX = function (x, elStyle) {
					elStyle.left = x + 'px';
				};
				_applyZoomPanToItem = function (item) {

					var zoomRatio = item.fitRatio > 1 ? 1 : item.fitRatio,
						s = item.container.style,
						w = zoomRatio * item.w,
						h = zoomRatio * item.h;

					s.width = w + 'px';
					s.height = h + 'px';
					s.left = item.initialPosition.x + 'px';
					s.top = item.initialPosition.y + 'px';

				};
				_applyCurrentZoomPan = function () {
					if (_currZoomElementStyle) {

						var s = _currZoomElementStyle,
							item = self.currItem,
							zoomRatio = item.fitRatio > 1 ? 1 : item.fitRatio,
							w = zoomRatio * item.w,
							h = zoomRatio * item.h;

						s.width = w + 'px';
						s.height = h + 'px';


						s.left = _panOffset.x + 'px';
						s.top = _panOffset.y + 'px';
					}

				};
			},

			_onKeyDown = function (e) {
				var keydownAction = '';
				if (_options.escKey && e.keyCode === 27) {
					keydownAction = 'close';
				} else if (_options.arrowKeys) {
					if (e.keyCode === 37) {
						keydownAction = 'prev';
					} else if (e.keyCode === 39) {
						keydownAction = 'next';
					}
				}

				if (keydownAction) {
					// don't do anything if special key pressed to prevent from overriding default browser actions
					// e.g. in Chrome on Mac cmd+arrow-left returns to previous page
					if (!e.ctrlKey && !e.altKey && !e.shiftKey && !e.metaKey) {
						if (e.preventDefault) {
							e.preventDefault();
						} else {
							e.returnValue = false;
						}
						self[keydownAction]();
					}
				}
			},

			_onGlobalClick = function (e) {
				if (!e) {
					return;
				}

				// don't allow click event to pass through when triggering after drag or some other gesture
				if (_moved || _zoomStarted || _mainScrollAnimating || _verticalDragInitiated) {
					e.preventDefault();
					e.stopPropagation();
				}
			},

			_updatePageScrollOffset = function () {
				self.setScrollOffset(0, framework.getScrollY());
			};







		// Micro animation engine
		var _animations = {},
			_numAnimations = 0,
			_stopAnimation = function (name) {
				if (_animations[name]) {
					if (_animations[name].raf) {
						_cancelAF(_animations[name].raf);
					}
					_numAnimations--;
					delete _animations[name];
				}
			},
			_registerStartAnimation = function (name) {
				if (_animations[name]) {
					_stopAnimation(name);
				}
				if (!_animations[name]) {
					_numAnimations++;
					_animations[name] = {};
				}
			},
			_stopAllAnimations = function () {
				for (var prop in _animations) {

					if (_animations.hasOwnProperty(prop)) {
						_stopAnimation(prop);
					}

				}
			},
			_animateProp = function (name, b, endProp, d, easingFn, onUpdate, onComplete) {
				var startAnimTime = _getCurrentTime(), t;
				_registerStartAnimation(name);

				var animloop = function () {
					if (_animations[name]) {

						t = _getCurrentTime() - startAnimTime; // time diff
						//b - beginning (start prop)
						//d - anim duration

						if (t >= d) {
							_stopAnimation(name);
							onUpdate(endProp);
							if (onComplete) {
								onComplete();
							}
							return;
						}
						onUpdate((endProp - b) * easingFn(t / d) + b);

						_animations[name].raf = _requestAF(animloop);
					}
				};
				animloop();
			};



		var publicMethods = {

			// make a few local variables and functions public
			shout: _shout,
			listen: _listen,
			viewportSize: _viewportSize,
			options: _options,

			isMainScrollAnimating: function () {
				return _mainScrollAnimating;
			},
			getZoomLevel: function () {
				return _currZoomLevel;
			},
			getCurrentIndex: function () {
				return _currentItemIndex;
			},
			isDragging: function () {
				return _isDragging;
			},
			isZooming: function () {
				return _isZooming;
			},
			setScrollOffset: function (x, y) {
				_offset.x = x;
				_currentWindowScrollY = _offset.y = y;
				_shout('updateScrollOffset', _offset);
			},
			applyZoomPan: function (zoomLevel, panX, panY, allowRenderResolution) {
				_panOffset.x = panX;
				_panOffset.y = panY;
				_currZoomLevel = zoomLevel;
				_applyCurrentZoomPan(allowRenderResolution);
			},

			init: function () {

				if (_isOpen || _isDestroying) {
					return;
				}

				var i;

				self.framework = framework; // basic functionality
				self.template = template; // root DOM element of PhotoSwipe
				self.bg = framework.getChildByClass(template, 'pswp__bg');

				_initalClassName = template.className;
				_isOpen = true;

				_features = framework.detectFeatures();
				_requestAF = _features.raf;
				_cancelAF = _features.caf;
				_transformKey = _features.transform;
				_oldIE = _features.oldIE;

				self.scrollWrap = framework.getChildByClass(template, 'pswp__scroll-wrap');
				self.container = framework.getChildByClass(self.scrollWrap, 'pswp__container');

				_containerStyle = self.container.style; // for fast access

				// Objects that hold slides (there are only 3 in DOM)
				self.itemHolders = _itemHolders = [
					{ el: self.container.children[0], wrap: 0, index: -1 },
					{ el: self.container.children[1], wrap: 0, index: -1 },
					{ el: self.container.children[2], wrap: 0, index: -1 }
				];

				// hide nearby item holders until initial zoom animation finishes (to avoid extra Paints)
				_itemHolders[0].el.style.display = _itemHolders[2].el.style.display = 'none';

				_setupTransforms();

				// Setup global events
				_globalEventHandlers = {
					resize: self.updateSize,

					// Fixes: iOS 10.3 resize event
					// does not update scrollWrap.clientWidth instantly after resize
					// https://github.com/dimsemenov/PhotoSwipe/issues/1315
					orientationchange: function () {
						clearTimeout(_orientationChangeTimeout);
						_orientationChangeTimeout = setTimeout(function () {
							if (_viewportSize.x !== self.scrollWrap.clientWidth) {
								self.updateSize();
							}
						}, 500);
					},
					scroll: _updatePageScrollOffset,
					keydown: _onKeyDown,
					click: _onGlobalClick
				};

				// disable show/hide effects on old browsers that don't support CSS animations or transforms, 
				// old IOS, Android and Opera mobile. Blackberry seems to work fine, even older models.
				var oldPhone = _features.isOldIOSPhone || _features.isOldAndroid || _features.isMobileOpera;
				if (!_features.animationName || !_features.transform || oldPhone) {
					_options.showAnimationDuration = _options.hideAnimationDuration = 0;
				}

				// init modules
				for (i = 0; i < _modules.length; i++) {
					self['init' + _modules[i]]();
				}

				// init
				if (UiClass) {
					var ui = self.ui = new UiClass(self, framework);
					ui.init();
				}

				_shout('firstUpdate');
				_currentItemIndex = _currentItemIndex || _options.index || 0;
				// validate index
				if (isNaN(_currentItemIndex) || _currentItemIndex < 0 || _currentItemIndex >= _getNumItems()) {
					_currentItemIndex = 0;
				}
				self.currItem = _getItemAt(_currentItemIndex);


				if (_features.isOldIOSPhone || _features.isOldAndroid) {
					_isFixedPosition = false;
				}

				template.setAttribute('aria-hidden', 'false');
				if (_options.modal) {
					if (!_isFixedPosition) {
						template.style.position = 'absolute';
						template.style.top = framework.getScrollY() + 'px';
					} else {
						template.style.position = 'fixed';
					}
				}

				if (_currentWindowScrollY === undefined) {
					_shout('initialLayout');
					_currentWindowScrollY = _initalWindowScrollY = framework.getScrollY();
				}

				// add classes to root element of PhotoSwipe
				var rootClasses = 'pswp--open ';
				if (_options.mainClass) {
					rootClasses += _options.mainClass + ' ';
				}
				if (_options.showHideOpacity) {
					rootClasses += 'pswp--animate_opacity ';
				}
				rootClasses += _likelyTouchDevice ? 'pswp--touch' : 'pswp--notouch';
				rootClasses += _features.animationName ? ' pswp--css_animation' : '';
				rootClasses += _features.svg ? ' pswp--svg' : '';
				framework.addClass(template, rootClasses);

				self.updateSize();

				// initial update
				_containerShiftIndex = -1;
				_indexDiff = null;
				for (i = 0; i < NUM_HOLDERS; i++) {
					_setTranslateX((i + _containerShiftIndex) * _slideSize.x, _itemHolders[i].el.style);
				}

				if (!_oldIE) {
					framework.bind(self.scrollWrap, _downEvents, self); // no dragging for old IE
				}

				_listen('initialZoomInEnd', function () {
					self.setContent(_itemHolders[0], _currentItemIndex - 1);
					self.setContent(_itemHolders[2], _currentItemIndex + 1);

					_itemHolders[0].el.style.display = _itemHolders[2].el.style.display = 'block';

					if (_options.focus) {
						// focus causes layout, 
						// which causes lag during the animation, 
						// that's why we delay it untill the initial zoom transition ends
						template.focus();
					}


					_bindEvents();
				});

				// set content for center slide (first time)
				self.setContent(_itemHolders[1], _currentItemIndex);

				self.updateCurrItem();

				_shout('afterInit');

				if (!_isFixedPosition) {

					// On all versions of iOS lower than 8.0, we check size of viewport every second.
					// 
					// This is done to detect when Safari top & bottom bars appear, 
					// as this action doesn't trigger any events (like resize). 
					// 
					// On iOS8 they fixed this.
					// 
					// 10 Nov 2014: iOS 7 usage ~40%. iOS 8 usage 56%.

					_updateSizeInterval = setInterval(function () {
						if (!_numAnimations && !_isDragging && !_isZooming && (_currZoomLevel === self.currItem.initialZoomLevel)) {
							self.updateSize();
						}
					}, 1000);
				}

				framework.addClass(template, 'pswp--visible');
			},

			// Close the gallery, then destroy it
			close: function () {
				if (!_isOpen) {
					return;
				}

				_isOpen = false;
				_isDestroying = true;
				_shout('close');
				_unbindEvents();

				_showOrHide(self.currItem, null, true, self.destroy);
			},

			// destroys the gallery (unbinds events, cleans up intervals and timeouts to avoid memory leaks)
			destroy: function () {
				_shout('destroy');

				if (_showOrHideTimeout) {
					clearTimeout(_showOrHideTimeout);
				}

				template.setAttribute('aria-hidden', 'true');
				template.className = _initalClassName;

				if (_updateSizeInterval) {
					clearInterval(_updateSizeInterval);
				}

				framework.unbind(self.scrollWrap, _downEvents, self);

				// we unbind scroll event at the end, as closing animation may depend on it
				framework.unbind(window, 'scroll', self);

				_stopDragUpdateLoop();

				_stopAllAnimations();

				_listeners = null;
			},

			/**
			 * Pan image to position
			 * @param {Number} x     
			 * @param {Number} y     
			 * @param {Boolean} force Will ignore bounds if set to true.
			 */
			panTo: function (x, y, force) {
				if (!force) {
					if (x > _currPanBounds.min.x) {
						x = _currPanBounds.min.x;
					} else if (x < _currPanBounds.max.x) {
						x = _currPanBounds.max.x;
					}

					if (y > _currPanBounds.min.y) {
						y = _currPanBounds.min.y;
					} else if (y < _currPanBounds.max.y) {
						y = _currPanBounds.max.y;
					}
				}

				_panOffset.x = x;
				_panOffset.y = y;
				_applyCurrentZoomPan();
			},

			handleEvent: function (e) {
				e = e || window.event;
				if (_globalEventHandlers[e.type]) {
					_globalEventHandlers[e.type](e);
				}
			},


			goTo: function (index) {

				index = _getLoopedId(index);

				var diff = index - _currentItemIndex;
				_indexDiff = diff;

				_currentItemIndex = index;
				self.currItem = _getItemAt(_currentItemIndex);
				_currPositionIndex -= diff;

				_moveMainScroll(_slideSize.x * _currPositionIndex);


				_stopAllAnimations();
				_mainScrollAnimating = false;

				self.updateCurrItem();
			},
			next: function () {
				self.goTo(_currentItemIndex + 1);
			},
			prev: function () {
				self.goTo(_currentItemIndex - 1);
			},

			// update current zoom/pan objects
			updateCurrZoomItem: function (emulateSetContent) {
				if (emulateSetContent) {
					_shout('beforeChange', 0);
				}

				// itemHolder[1] is middle (current) item
				if (_itemHolders[1].el.children.length) {
					var zoomElement = _itemHolders[1].el.children[0];
					if (framework.hasClass(zoomElement, 'pswp__zoom-wrap')) {
						_currZoomElementStyle = zoomElement.style;
					} else {
						_currZoomElementStyle = null;
					}
				} else {
					_currZoomElementStyle = null;
				}

				_currPanBounds = self.currItem.bounds;
				_startZoomLevel = _currZoomLevel = self.currItem.initialZoomLevel;

				_panOffset.x = _currPanBounds.center.x;
				_panOffset.y = _currPanBounds.center.y;

				if (emulateSetContent) {
					_shout('afterChange');
				}
			},


			invalidateCurrItems: function () {
				_itemsNeedUpdate = true;
				for (var i = 0; i < NUM_HOLDERS; i++) {
					if (_itemHolders[i].item) {
						_itemHolders[i].item.needsUpdate = true;
					}
				}
			},

			updateCurrItem: function (beforeAnimation) {

				if (_indexDiff === 0) {
					return;
				}

				var diffAbs = Math.abs(_indexDiff),
					tempHolder;

				if (beforeAnimation && diffAbs < 2) {
					return;
				}


				self.currItem = _getItemAt(_currentItemIndex);
				_renderMaxResolution = false;

				_shout('beforeChange', _indexDiff);

				if (diffAbs >= NUM_HOLDERS) {
					_containerShiftIndex += _indexDiff + (_indexDiff > 0 ? -NUM_HOLDERS : NUM_HOLDERS);
					diffAbs = NUM_HOLDERS;
				}
				for (var i = 0; i < diffAbs; i++) {
					if (_indexDiff > 0) {
						tempHolder = _itemHolders.shift();
						_itemHolders[NUM_HOLDERS - 1] = tempHolder; // move first to last

						_containerShiftIndex++;
						_setTranslateX((_containerShiftIndex + 2) * _slideSize.x, tempHolder.el.style);
						self.setContent(tempHolder, _currentItemIndex - diffAbs + i + 1 + 1);
					} else {
						tempHolder = _itemHolders.pop();
						_itemHolders.unshift(tempHolder); // move last to first

						_containerShiftIndex--;
						_setTranslateX(_containerShiftIndex * _slideSize.x, tempHolder.el.style);
						self.setContent(tempHolder, _currentItemIndex + diffAbs - i - 1 - 1);
					}

				}

				// reset zoom/pan on previous item
				if (_currZoomElementStyle && Math.abs(_indexDiff) === 1) {

					var prevItem = _getItemAt(_prevItemIndex);
					if (prevItem.initialZoomLevel !== _currZoomLevel) {
						_calculateItemSize(prevItem, _viewportSize);
						_setImageSize(prevItem);
						_applyZoomPanToItem(prevItem);
					}

				}

				// reset diff after update
				_indexDiff = 0;

				self.updateCurrZoomItem();

				_prevItemIndex = _currentItemIndex;

				_shout('afterChange');

			},



			updateSize: function (force) {

				if (!_isFixedPosition && _options.modal) {
					var windowScrollY = framework.getScrollY();
					if (_currentWindowScrollY !== windowScrollY) {
						template.style.top = windowScrollY + 'px';
						_currentWindowScrollY = windowScrollY;
					}
					if (!force && _windowVisibleSize.x === window.innerWidth && _windowVisibleSize.y === window.innerHeight) {
						return;
					}
					_windowVisibleSize.x = window.innerWidth;
					_windowVisibleSize.y = window.innerHeight;

					//template.style.width = _windowVisibleSize.x + 'px';
					template.style.height = _windowVisibleSize.y + 'px';
				}



				_viewportSize.x = self.scrollWrap.clientWidth;
				_viewportSize.y = self.scrollWrap.clientHeight;

				_updatePageScrollOffset();

				_slideSize.x = _viewportSize.x + Math.round(_viewportSize.x * _options.spacing);
				_slideSize.y = _viewportSize.y;

				_moveMainScroll(_slideSize.x * _currPositionIndex);

				_shout('beforeResize'); // even may be used for example to switch image sources


				// don't re-calculate size on inital size update
				if (_containerShiftIndex !== undefined) {

					var holder,
						item,
						hIndex;

					for (var i = 0; i < NUM_HOLDERS; i++) {
						holder = _itemHolders[i];
						_setTranslateX((i + _containerShiftIndex) * _slideSize.x, holder.el.style);

						hIndex = _currentItemIndex + i - 1;

						if (_options.loop && _getNumItems() > 2) {
							hIndex = _getLoopedId(hIndex);
						}

						// update zoom level on items and refresh source (if needsUpdate)
						item = _getItemAt(hIndex);

						// re-render gallery item if `needsUpdate`,
						// or doesn't have `bounds` (entirely new slide object)
						if (item && (_itemsNeedUpdate || item.needsUpdate || !item.bounds)) {

							self.cleanSlide(item);

							self.setContent(holder, hIndex);

							// if "center" slide
							if (i === 1) {
								self.currItem = item;
								self.updateCurrZoomItem(true);
							}

							item.needsUpdate = false;

						} else if (holder.index === -1 && hIndex >= 0) {
							// add content first time
							self.setContent(holder, hIndex);
						}
						if (item && item.container) {
							_calculateItemSize(item, _viewportSize);
							_setImageSize(item);
							_applyZoomPanToItem(item);
						}

					}
					_itemsNeedUpdate = false;
				}

				_startZoomLevel = _currZoomLevel = self.currItem.initialZoomLevel;
				_currPanBounds = self.currItem.bounds;

				if (_currPanBounds) {
					_panOffset.x = _currPanBounds.center.x;
					_panOffset.y = _currPanBounds.center.y;
					_applyCurrentZoomPan(true);
				}

				_shout('resize');
			},

			// Zoom current item to
			zoomTo: function (destZoomLevel, centerPoint, speed, easingFn, updateFn) {
				/*
					if(destZoomLevel === 'fit') {
						destZoomLevel = self.currItem.fitRatio;
					} else if(destZoomLevel === 'fill') {
						destZoomLevel = self.currItem.fillRatio;
					}
				*/

				if (centerPoint) {
					_startZoomLevel = _currZoomLevel;
					_midZoomPoint.x = Math.abs(centerPoint.x) - _panOffset.x;
					_midZoomPoint.y = Math.abs(centerPoint.y) - _panOffset.y;
					_equalizePoints(_startPanOffset, _panOffset);
				}

				var destPanBounds = _calculatePanBounds(destZoomLevel, false),
					destPanOffset = {};

				_modifyDestPanOffset('x', destPanBounds, destPanOffset, destZoomLevel);
				_modifyDestPanOffset('y', destPanBounds, destPanOffset, destZoomLevel);

				var initialZoomLevel = _currZoomLevel;
				var initialPanOffset = {
					x: _panOffset.x,
					y: _panOffset.y
				};

				_roundPoint(destPanOffset);

				var onUpdate = function (now) {
					if (now === 1) {
						_currZoomLevel = destZoomLevel;
						_panOffset.x = destPanOffset.x;
						_panOffset.y = destPanOffset.y;
					} else {
						_currZoomLevel = (destZoomLevel - initialZoomLevel) * now + initialZoomLevel;
						_panOffset.x = (destPanOffset.x - initialPanOffset.x) * now + initialPanOffset.x;
						_panOffset.y = (destPanOffset.y - initialPanOffset.y) * now + initialPanOffset.y;
					}

					if (updateFn) {
						updateFn(now);
					}

					_applyCurrentZoomPan(now === 1);
				};

				if (speed) {
					_animateProp('customZoomTo', 0, 1, speed, easingFn || framework.easing.sine.inOut, onUpdate);
				} else {
					onUpdate(1);
				}
			}


		};


		/*>>core*/

		/*>>gestures*/
		/**
		 * Mouse/touch/pointer event handlers.
		 * 
		 * separated from @core.js for readability
		 */

		var MIN_SWIPE_DISTANCE = 30,
			DIRECTION_CHECK_OFFSET = 10; // amount of pixels to drag to determine direction of swipe

		var _gestureStartTime,
			_gestureCheckSpeedTime,

			// pool of objects that are used during dragging of zooming
			p = {}, // first point
			p2 = {}, // second point (for zoom gesture)
			delta = {},
			_currPoint = {},
			_startPoint = {},
			_currPointers = [],
			_startMainScrollPos = {},
			_releaseAnimData,
			_posPoints = [], // array of points during dragging, used to determine type of gesture
			_tempPoint = {},

			_isZoomingIn,
			_verticalDragInitiated,
			_oldAndroidTouchEndTimeout,
			_currZoomedItemIndex = 0,
			_centerPoint = _getEmptyPoint(),
			_lastReleaseTime = 0,
			_isDragging, // at least one pointer is down
			_isMultitouch, // at least two _pointers are down
			_zoomStarted, // zoom level changed during zoom gesture
			_moved,
			_dragAnimFrame,
			_mainScrollShifted,
			_currentPoints, // array of current touch points
			_isZooming,
			_currPointsDistance,
			_startPointsDistance,
			_currPanBounds,
			_mainScrollPos = _getEmptyPoint(),
			_currZoomElementStyle,
			_mainScrollAnimating, // true, if animation after swipe gesture is running
			_midZoomPoint = _getEmptyPoint(),
			_currCenterPoint = _getEmptyPoint(),
			_direction,
			_isFirstMove,
			_opacityChanged,
			_bgOpacity,
			_wasOverInitialZoom,

			_isEqualPoints = function (p1, p2) {
				return p1.x === p2.x && p1.y === p2.y;
			},
			_isNearbyPoints = function (touch0, touch1) {
				return Math.abs(touch0.x - touch1.x) < DOUBLE_TAP_RADIUS && Math.abs(touch0.y - touch1.y) < DOUBLE_TAP_RADIUS;
			},
			_calculatePointsDistance = function (p1, p2) {
				_tempPoint.x = Math.abs(p1.x - p2.x);
				_tempPoint.y = Math.abs(p1.y - p2.y);
				return Math.sqrt(_tempPoint.x * _tempPoint.x + _tempPoint.y * _tempPoint.y);
			},
			_stopDragUpdateLoop = function () {
				if (_dragAnimFrame) {
					_cancelAF(_dragAnimFrame);
					_dragAnimFrame = null;
				}
			},
			_dragUpdateLoop = function () {
				if (_isDragging) {
					_dragAnimFrame = _requestAF(_dragUpdateLoop);
					_renderMovement();
				}
			},
			_canPan = function () {
				return !(_options.scaleMode === 'fit' && _currZoomLevel === self.currItem.initialZoomLevel);
			},

			// find the closest parent DOM element
			_closestElement = function (el, fn) {
				if (!el || el === document) {
					return false;
				}

				// don't search elements above pswp__scroll-wrap
				if (el.getAttribute('class') && el.getAttribute('class').indexOf('pswp__scroll-wrap') > -1) {
					return false;
				}

				if (fn(el)) {
					return el;
				}

				return _closestElement(el.parentNode, fn);
			},

			_preventObj = {},
			_preventDefaultEventBehaviour = function (e, isDown) {
				_preventObj.prevent = !_closestElement(e.target, _options.isClickableElement);

				_shout('preventDragEvent', e, isDown, _preventObj);
				return _preventObj.prevent;

			},
			_convertTouchToPoint = function (touch, p) {
				p.x = touch.pageX;
				p.y = touch.pageY;
				p.id = touch.identifier;
				return p;
			},
			_findCenterOfPoints = function (p1, p2, pCenter) {
				pCenter.x = (p1.x + p2.x) * 0.5;
				pCenter.y = (p1.y + p2.y) * 0.5;
			},
			_pushPosPoint = function (time, x, y) {
				if (time - _gestureCheckSpeedTime > 50) {
					var o = _posPoints.length > 2 ? _posPoints.shift() : {};
					o.x = x;
					o.y = y;
					_posPoints.push(o);
					_gestureCheckSpeedTime = time;
				}
			},

			_calculateVerticalDragOpacityRatio = function () {
				var yOffset = _panOffset.y - self.currItem.initialPosition.y; // difference between initial and current position
				return 1 - Math.abs(yOffset / (_viewportSize.y / 2));
			},


			// points pool, reused during touch events
			_ePoint1 = {},
			_ePoint2 = {},
			_tempPointsArr = [],
			_tempCounter,
			_getTouchPoints = function (e) {
				// clean up previous points, without recreating array
				while (_tempPointsArr.length > 0) {
					_tempPointsArr.pop();
				}

				if (!_pointerEventEnabled) {
					if (e.type.indexOf('touch') > -1) {

						if (e.touches && e.touches.length > 0) {
							_tempPointsArr[0] = _convertTouchToPoint(e.touches[0], _ePoint1);
							if (e.touches.length > 1) {
								_tempPointsArr[1] = _convertTouchToPoint(e.touches[1], _ePoint2);
							}
						}

					} else {
						_ePoint1.x = e.pageX;
						_ePoint1.y = e.pageY;
						_ePoint1.id = '';
						_tempPointsArr[0] = _ePoint1;//_ePoint1;
					}
				} else {
					_tempCounter = 0;
					// we can use forEach, as pointer events are supported only in modern browsers
					_currPointers.forEach(function (p) {
						if (_tempCounter === 0) {
							_tempPointsArr[0] = p;
						} else if (_tempCounter === 1) {
							_tempPointsArr[1] = p;
						}
						_tempCounter++;

					});
				}
				return _tempPointsArr;
			},

			_panOrMoveMainScroll = function (axis, delta) {

				var panFriction,
					overDiff = 0,
					newOffset = _panOffset[axis] + delta[axis],
					startOverDiff,
					dir = delta[axis] > 0,
					newMainScrollPosition = _mainScrollPos.x + delta.x,
					mainScrollDiff = _mainScrollPos.x - _startMainScrollPos.x,
					newPanPos,
					newMainScrollPos;

				// calculate fdistance over the bounds and friction
				if (newOffset > _currPanBounds.min[axis] || newOffset < _currPanBounds.max[axis]) {
					panFriction = _options.panEndFriction;
					// Linear increasing of friction, so at 1/4 of viewport it's at max value. 
					// Looks not as nice as was expected. Left for history.
					// panFriction = (1 - (_panOffset[axis] + delta[axis] + panBounds.min[axis]) / (_viewportSize[axis] / 4) );
				} else {
					panFriction = 1;
				}

				newOffset = _panOffset[axis] + delta[axis] * panFriction;

				// move main scroll or start panning
				if (_options.allowPanToNext || _currZoomLevel === self.currItem.initialZoomLevel) {


					if (!_currZoomElementStyle) {

						newMainScrollPos = newMainScrollPosition;

					} else if (_direction === 'h' && axis === 'x' && !_zoomStarted) {

						if (dir) {
							if (newOffset > _currPanBounds.min[axis]) {
								panFriction = _options.panEndFriction;
								overDiff = _currPanBounds.min[axis] - newOffset;
								startOverDiff = _currPanBounds.min[axis] - _startPanOffset[axis];
							}

							// drag right
							if ((startOverDiff <= 0 || mainScrollDiff < 0) && _getNumItems() > 1) {
								newMainScrollPos = newMainScrollPosition;
								if (mainScrollDiff < 0 && newMainScrollPosition > _startMainScrollPos.x) {
									newMainScrollPos = _startMainScrollPos.x;
								}
							} else {
								if (_currPanBounds.min.x !== _currPanBounds.max.x) {
									newPanPos = newOffset;
								}

							}

						} else {

							if (newOffset < _currPanBounds.max[axis]) {
								panFriction = _options.panEndFriction;
								overDiff = newOffset - _currPanBounds.max[axis];
								startOverDiff = _startPanOffset[axis] - _currPanBounds.max[axis];
							}

							if ((startOverDiff <= 0 || mainScrollDiff > 0) && _getNumItems() > 1) {
								newMainScrollPos = newMainScrollPosition;

								if (mainScrollDiff > 0 && newMainScrollPosition < _startMainScrollPos.x) {
									newMainScrollPos = _startMainScrollPos.x;
								}

							} else {
								if (_currPanBounds.min.x !== _currPanBounds.max.x) {
									newPanPos = newOffset;
								}
							}

						}


						//
					}

					if (axis === 'x') {

						if (newMainScrollPos !== undefined) {
							_moveMainScroll(newMainScrollPos, true);
							if (newMainScrollPos === _startMainScrollPos.x) {
								_mainScrollShifted = false;
							} else {
								_mainScrollShifted = true;
							}
						}

						if (_currPanBounds.min.x !== _currPanBounds.max.x) {
							if (newPanPos !== undefined) {
								_panOffset.x = newPanPos;
							} else if (!_mainScrollShifted) {
								_panOffset.x += delta.x * panFriction;
							}
						}

						return newMainScrollPos !== undefined;
					}

				}

				if (!_mainScrollAnimating) {

					if (!_mainScrollShifted) {
						if (_currZoomLevel > self.currItem.fitRatio) {
							_panOffset[axis] += delta[axis] * panFriction;

						}
					}


				}

			},

			// Pointerdown/touchstart/mousedown handler
			_onDragStart = function (e) {

				// Allow dragging only via left mouse button.
				// As this handler is not added in IE8 - we ignore e.which
				// 
				// http://www.quirksmode.org/js/events_properties.html
				// https://developer.mozilla.org/en-US/docs/Web/API/event.button
				if (e.type === 'mousedown' && e.button > 0) {
					return;
				}

				if (_initialZoomRunning) {
					e.preventDefault();
					return;
				}

				if (_oldAndroidTouchEndTimeout && e.type === 'mousedown') {
					return;
				}

				if (_preventDefaultEventBehaviour(e, true)) {
					e.preventDefault();
				}



				_shout('pointerDown');

				if (_pointerEventEnabled) {
					var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');
					if (pointerIndex < 0) {
						pointerIndex = _currPointers.length;
					}
					_currPointers[pointerIndex] = { x: e.pageX, y: e.pageY, id: e.pointerId };
				}



				var startPointsList = _getTouchPoints(e),
					numPoints = startPointsList.length;

				_currentPoints = null;

				_stopAllAnimations();

				// init drag
				if (!_isDragging || numPoints === 1) {



					_isDragging = _isFirstMove = true;
					framework.bind(window, _upMoveEvents, self);

					_isZoomingIn =
						_wasOverInitialZoom =
						_opacityChanged =
						_verticalDragInitiated =
						_mainScrollShifted =
						_moved =
						_isMultitouch =
						_zoomStarted = false;

					_direction = null;

					_shout('firstTouchStart', startPointsList);

					_equalizePoints(_startPanOffset, _panOffset);

					_currPanDist.x = _currPanDist.y = 0;
					_equalizePoints(_currPoint, startPointsList[0]);
					_equalizePoints(_startPoint, _currPoint);

					//_equalizePoints(_startMainScrollPos, _mainScrollPos);
					_startMainScrollPos.x = _slideSize.x * _currPositionIndex;

					_posPoints = [{
						x: _currPoint.x,
						y: _currPoint.y
					}];

					_gestureCheckSpeedTime = _gestureStartTime = _getCurrentTime();

					//_mainScrollAnimationEnd(true);
					_calculatePanBounds(_currZoomLevel, true);

					// Start rendering
					_stopDragUpdateLoop();
					_dragUpdateLoop();

				}

				// init zoom
				if (!_isZooming && numPoints > 1 && !_mainScrollAnimating && !_mainScrollShifted) {
					_startZoomLevel = _currZoomLevel;
					_zoomStarted = false; // true if zoom changed at least once

					_isZooming = _isMultitouch = true;
					_currPanDist.y = _currPanDist.x = 0;

					_equalizePoints(_startPanOffset, _panOffset);

					_equalizePoints(p, startPointsList[0]);
					_equalizePoints(p2, startPointsList[1]);

					_findCenterOfPoints(p, p2, _currCenterPoint);

					_midZoomPoint.x = Math.abs(_currCenterPoint.x) - _panOffset.x;
					_midZoomPoint.y = Math.abs(_currCenterPoint.y) - _panOffset.y;
					_currPointsDistance = _startPointsDistance = _calculatePointsDistance(p, p2);
				}


			},

			// Pointermove/touchmove/mousemove handler
			_onDragMove = function (e) {

				e.preventDefault();

				if (_pointerEventEnabled) {
					var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');
					if (pointerIndex > -1) {
						var p = _currPointers[pointerIndex];
						p.x = e.pageX;
						p.y = e.pageY;
					}
				}

				if (_isDragging) {
					var touchesList = _getTouchPoints(e);
					if (!_direction && !_moved && !_isZooming) {

						if (_mainScrollPos.x !== _slideSize.x * _currPositionIndex) {
							// if main scroll position is shifted – direction is always horizontal
							_direction = 'h';
						} else {
							var diff = Math.abs(touchesList[0].x - _currPoint.x) - Math.abs(touchesList[0].y - _currPoint.y);
							// check the direction of movement
							if (Math.abs(diff) >= DIRECTION_CHECK_OFFSET) {
								_direction = diff > 0 ? 'h' : 'v';
								_currentPoints = touchesList;
							}
						}

					} else {
						_currentPoints = touchesList;
					}
				}
			},
			// 
			_renderMovement = function () {

				if (!_currentPoints) {
					return;
				}

				var numPoints = _currentPoints.length;

				if (numPoints === 0) {
					return;
				}

				_equalizePoints(p, _currentPoints[0]);

				delta.x = p.x - _currPoint.x;
				delta.y = p.y - _currPoint.y;

				if (_isZooming && numPoints > 1) {
					// Handle behaviour for more than 1 point

					_currPoint.x = p.x;
					_currPoint.y = p.y;

					// check if one of two points changed
					if (!delta.x && !delta.y && _isEqualPoints(_currentPoints[1], p2)) {
						return;
					}

					_equalizePoints(p2, _currentPoints[1]);


					if (!_zoomStarted) {
						_zoomStarted = true;
						_shout('zoomGestureStarted');
					}

					// Distance between two points
					var pointsDistance = _calculatePointsDistance(p, p2);

					var zoomLevel = _calculateZoomLevel(pointsDistance);

					// slightly over the of initial zoom level
					if (zoomLevel > self.currItem.initialZoomLevel + self.currItem.initialZoomLevel / 15) {
						_wasOverInitialZoom = true;
					}

					// Apply the friction if zoom level is out of the bounds
					var zoomFriction = 1,
						minZoomLevel = _getMinZoomLevel(),
						maxZoomLevel = _getMaxZoomLevel();

					if (zoomLevel < minZoomLevel) {

						if (_options.pinchToClose && !_wasOverInitialZoom && _startZoomLevel <= self.currItem.initialZoomLevel) {
							// fade out background if zooming out
							var minusDiff = minZoomLevel - zoomLevel;
							var percent = 1 - minusDiff / (minZoomLevel / 1.2);

							_applyBgOpacity(percent);
							_shout('onPinchClose', percent);
							_opacityChanged = true;
						} else {
							zoomFriction = (minZoomLevel - zoomLevel) / minZoomLevel;
							if (zoomFriction > 1) {
								zoomFriction = 1;
							}
							zoomLevel = minZoomLevel - zoomFriction * (minZoomLevel / 3);
						}

					} else if (zoomLevel > maxZoomLevel) {
						// 1.5 - extra zoom level above the max. E.g. if max is x6, real max 6 + 1.5 = 7.5
						zoomFriction = (zoomLevel - maxZoomLevel) / (minZoomLevel * 6);
						if (zoomFriction > 1) {
							zoomFriction = 1;
						}
						zoomLevel = maxZoomLevel + zoomFriction * minZoomLevel;
					}

					if (zoomFriction < 0) {
						zoomFriction = 0;
					}

					// distance between touch points after friction is applied
					_currPointsDistance = pointsDistance;

					// _centerPoint - The point in the middle of two pointers
					_findCenterOfPoints(p, p2, _centerPoint);

					// paning with two pointers pressed
					_currPanDist.x += _centerPoint.x - _currCenterPoint.x;
					_currPanDist.y += _centerPoint.y - _currCenterPoint.y;
					_equalizePoints(_currCenterPoint, _centerPoint);

					_panOffset.x = _calculatePanOffset('x', zoomLevel);
					_panOffset.y = _calculatePanOffset('y', zoomLevel);

					_isZoomingIn = zoomLevel > _currZoomLevel;
					_currZoomLevel = zoomLevel;
					_applyCurrentZoomPan();

				} else {

					// handle behaviour for one point (dragging or panning)

					if (!_direction) {
						return;
					}

					if (_isFirstMove) {
						_isFirstMove = false;

						// subtract drag distance that was used during the detection direction  

						if (Math.abs(delta.x) >= DIRECTION_CHECK_OFFSET) {
							delta.x -= _currentPoints[0].x - _startPoint.x;
						}

						if (Math.abs(delta.y) >= DIRECTION_CHECK_OFFSET) {
							delta.y -= _currentPoints[0].y - _startPoint.y;
						}
					}

					_currPoint.x = p.x;
					_currPoint.y = p.y;

					// do nothing if pointers position hasn't changed
					if (delta.x === 0 && delta.y === 0) {
						return;
					}

					if (_direction === 'v' && _options.closeOnVerticalDrag) {
						if (!_canPan()) {
							_currPanDist.y += delta.y;
							_panOffset.y += delta.y;

							var opacityRatio = _calculateVerticalDragOpacityRatio();

							_verticalDragInitiated = true;
							_shout('onVerticalDrag', opacityRatio);

							_applyBgOpacity(opacityRatio);
							_applyCurrentZoomPan();
							return;
						}
					}

					_pushPosPoint(_getCurrentTime(), p.x, p.y);

					_moved = true;
					_currPanBounds = self.currItem.bounds;

					var mainScrollChanged = _panOrMoveMainScroll('x', delta);
					if (!mainScrollChanged) {
						_panOrMoveMainScroll('y', delta);

						_roundPoint(_panOffset);
						_applyCurrentZoomPan();
					}

				}

			},

			// Pointerup/pointercancel/touchend/touchcancel/mouseup event handler
			_onDragRelease = function (e) {

				if (_features.isOldAndroid) {

					if (_oldAndroidTouchEndTimeout && e.type === 'mouseup') {
						return;
					}

					// on Android (v4.1, 4.2, 4.3 & possibly older) 
					// ghost mousedown/up event isn't preventable via e.preventDefault,
					// which causes fake mousedown event
					// so we block mousedown/up for 600ms
					if (e.type.indexOf('touch') > -1) {
						clearTimeout(_oldAndroidTouchEndTimeout);
						_oldAndroidTouchEndTimeout = setTimeout(function () {
							_oldAndroidTouchEndTimeout = 0;
						}, 600);
					}

				}

				_shout('pointerUp');

				if (_preventDefaultEventBehaviour(e, false)) {
					e.preventDefault();
				}

				var releasePoint;

				if (_pointerEventEnabled) {
					var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');

					if (pointerIndex > -1) {
						releasePoint = _currPointers.splice(pointerIndex, 1)[0];

						if (navigator.msPointerEnabled) {
							var MSPOINTER_TYPES = {
								4: 'mouse', // event.MSPOINTER_TYPE_MOUSE
								2: 'touch', // event.MSPOINTER_TYPE_TOUCH 
								3: 'pen' // event.MSPOINTER_TYPE_PEN
							};
							releasePoint.type = MSPOINTER_TYPES[e.pointerType];

							if (!releasePoint.type) {
								releasePoint.type = e.pointerType || 'mouse';
							}
						} else {
							releasePoint.type = e.pointerType || 'mouse';
						}

					}
				}

				var touchList = _getTouchPoints(e),
					gestureType,
					numPoints = touchList.length;

				if (e.type === 'mouseup') {
					numPoints = 0;
				}

				// Do nothing if there were 3 touch points or more
				if (numPoints === 2) {
					_currentPoints = null;
					return true;
				}

				// if second pointer released
				if (numPoints === 1) {
					_equalizePoints(_startPoint, touchList[0]);
				}


				// pointer hasn't moved, send "tap release" point
				if (numPoints === 0 && !_direction && !_mainScrollAnimating) {
					if (!releasePoint) {
						if (e.type === 'mouseup') {
							releasePoint = { x: e.pageX, y: e.pageY, type: 'mouse' };
						} else if (e.changedTouches && e.changedTouches[0]) {
							releasePoint = { x: e.changedTouches[0].pageX, y: e.changedTouches[0].pageY, type: 'touch' };
						}
					}

					_shout('touchRelease', e, releasePoint);
				}

				// Difference in time between releasing of two last touch points (zoom gesture)
				var releaseTimeDiff = -1;

				// Gesture completed, no pointers left
				if (numPoints === 0) {
					_isDragging = false;
					framework.unbind(window, _upMoveEvents, self);

					_stopDragUpdateLoop();

					if (_isZooming) {
						// Two points released at the same time
						releaseTimeDiff = 0;
					} else if (_lastReleaseTime !== -1) {
						releaseTimeDiff = _getCurrentTime() - _lastReleaseTime;
					}
				}
				_lastReleaseTime = numPoints === 1 ? _getCurrentTime() : -1;

				if (releaseTimeDiff !== -1 && releaseTimeDiff < 150) {
					gestureType = 'zoom';
				} else {
					gestureType = 'swipe';
				}

				if (_isZooming && numPoints < 2) {
					_isZooming = false;

					// Only second point released
					if (numPoints === 1) {
						gestureType = 'zoomPointerUp';
					}
					_shout('zoomGestureEnded');
				}

				_currentPoints = null;
				if (!_moved && !_zoomStarted && !_mainScrollAnimating && !_verticalDragInitiated) {
					// nothing to animate
					return;
				}

				_stopAllAnimations();


				if (!_releaseAnimData) {
					_releaseAnimData = _initDragReleaseAnimationData();
				}

				_releaseAnimData.calculateSwipeSpeed('x');


				if (_verticalDragInitiated) {

					var opacityRatio = _calculateVerticalDragOpacityRatio();

					if (opacityRatio < _options.verticalDragRange) {
						self.close();
					} else {
						var initalPanY = _panOffset.y,
							initialBgOpacity = _bgOpacity;

						_animateProp('verticalDrag', 0, 1, 300, framework.easing.cubic.out, function (now) {

							_panOffset.y = (self.currItem.initialPosition.y - initalPanY) * now + initalPanY;

							_applyBgOpacity((1 - initialBgOpacity) * now + initialBgOpacity);
							_applyCurrentZoomPan();
						});

						_shout('onVerticalDrag', 1);
					}

					return;
				}


				// main scroll 
				if ((_mainScrollShifted || _mainScrollAnimating) && numPoints === 0) {
					var itemChanged = _finishSwipeMainScrollGesture(gestureType, _releaseAnimData);
					if (itemChanged) {
						return;
					}
					gestureType = 'zoomPointerUp';
				}

				// prevent zoom/pan animation when main scroll animation runs
				if (_mainScrollAnimating) {
					return;
				}

				// Complete simple zoom gesture (reset zoom level if it's out of the bounds)  
				if (gestureType !== 'swipe') {
					_completeZoomGesture();
					return;
				}

				// Complete pan gesture if main scroll is not shifted, and it's possible to pan current image
				if (!_mainScrollShifted && _currZoomLevel > self.currItem.fitRatio) {
					_completePanGesture(_releaseAnimData);
				}
			},


			// Returns object with data about gesture
			// It's created only once and then reused
			_initDragReleaseAnimationData = function () {
				// temp local vars
				var lastFlickDuration,
					tempReleasePos;

				// s = this
				var s = {
					lastFlickOffset: {},
					lastFlickDist: {},
					lastFlickSpeed: {},
					slowDownRatio: {},
					slowDownRatioReverse: {},
					speedDecelerationRatio: {},
					speedDecelerationRatioAbs: {},
					distanceOffset: {},
					backAnimDestination: {},
					backAnimStarted: {},
					calculateSwipeSpeed: function (axis) {


						if (_posPoints.length > 1) {
							lastFlickDuration = _getCurrentTime() - _gestureCheckSpeedTime + 50;
							tempReleasePos = _posPoints[_posPoints.length - 2][axis];
						} else {
							lastFlickDuration = _getCurrentTime() - _gestureStartTime; // total gesture duration
							tempReleasePos = _startPoint[axis];
						}
						s.lastFlickOffset[axis] = _currPoint[axis] - tempReleasePos;
						s.lastFlickDist[axis] = Math.abs(s.lastFlickOffset[axis]);
						if (s.lastFlickDist[axis] > 20) {
							s.lastFlickSpeed[axis] = s.lastFlickOffset[axis] / lastFlickDuration;
						} else {
							s.lastFlickSpeed[axis] = 0;
						}
						if (Math.abs(s.lastFlickSpeed[axis]) < 0.1) {
							s.lastFlickSpeed[axis] = 0;
						}

						s.slowDownRatio[axis] = 0.95;
						s.slowDownRatioReverse[axis] = 1 - s.slowDownRatio[axis];
						s.speedDecelerationRatio[axis] = 1;
					},

					calculateOverBoundsAnimOffset: function (axis, speed) {
						if (!s.backAnimStarted[axis]) {

							if (_panOffset[axis] > _currPanBounds.min[axis]) {
								s.backAnimDestination[axis] = _currPanBounds.min[axis];

							} else if (_panOffset[axis] < _currPanBounds.max[axis]) {
								s.backAnimDestination[axis] = _currPanBounds.max[axis];
							}

							if (s.backAnimDestination[axis] !== undefined) {
								s.slowDownRatio[axis] = 0.7;
								s.slowDownRatioReverse[axis] = 1 - s.slowDownRatio[axis];
								if (s.speedDecelerationRatioAbs[axis] < 0.05) {

									s.lastFlickSpeed[axis] = 0;
									s.backAnimStarted[axis] = true;

									_animateProp('bounceZoomPan' + axis, _panOffset[axis],
										s.backAnimDestination[axis],
										speed || 300,
										framework.easing.sine.out,
										function (pos) {
											_panOffset[axis] = pos;
											_applyCurrentZoomPan();
										}
									);

								}
							}
						}
					},

					// Reduces the speed by slowDownRatio (per 10ms)
					calculateAnimOffset: function (axis) {
						if (!s.backAnimStarted[axis]) {
							s.speedDecelerationRatio[axis] = s.speedDecelerationRatio[axis] * (s.slowDownRatio[axis] +
								s.slowDownRatioReverse[axis] -
								s.slowDownRatioReverse[axis] * s.timeDiff / 10);

							s.speedDecelerationRatioAbs[axis] = Math.abs(s.lastFlickSpeed[axis] * s.speedDecelerationRatio[axis]);
							s.distanceOffset[axis] = s.lastFlickSpeed[axis] * s.speedDecelerationRatio[axis] * s.timeDiff;
							_panOffset[axis] += s.distanceOffset[axis];

						}
					},

					panAnimLoop: function () {
						if (_animations.zoomPan) {
							_animations.zoomPan.raf = _requestAF(s.panAnimLoop);

							s.now = _getCurrentTime();
							s.timeDiff = s.now - s.lastNow;
							s.lastNow = s.now;

							s.calculateAnimOffset('x');
							s.calculateAnimOffset('y');

							_applyCurrentZoomPan();

							s.calculateOverBoundsAnimOffset('x');
							s.calculateOverBoundsAnimOffset('y');


							if (s.speedDecelerationRatioAbs.x < 0.05 && s.speedDecelerationRatioAbs.y < 0.05) {

								// round pan position
								_panOffset.x = Math.round(_panOffset.x);
								_panOffset.y = Math.round(_panOffset.y);
								_applyCurrentZoomPan();

								_stopAnimation('zoomPan');
								return;
							}
						}

					}
				};
				return s;
			},

			_completePanGesture = function (animData) {
				// calculate swipe speed for Y axis (paanning)
				animData.calculateSwipeSpeed('y');

				_currPanBounds = self.currItem.bounds;

				animData.backAnimDestination = {};
				animData.backAnimStarted = {};

				// Avoid acceleration animation if speed is too low
				if (Math.abs(animData.lastFlickSpeed.x) <= 0.05 && Math.abs(animData.lastFlickSpeed.y) <= 0.05) {
					animData.speedDecelerationRatioAbs.x = animData.speedDecelerationRatioAbs.y = 0;

					// Run pan drag release animation. E.g. if you drag image and release finger without momentum.
					animData.calculateOverBoundsAnimOffset('x');
					animData.calculateOverBoundsAnimOffset('y');
					return true;
				}

				// Animation loop that controls the acceleration after pan gesture ends
				_registerStartAnimation('zoomPan');
				animData.lastNow = _getCurrentTime();
				animData.panAnimLoop();
			},


			_finishSwipeMainScrollGesture = function (gestureType, _releaseAnimData) {
				var itemChanged;
				if (!_mainScrollAnimating) {
					_currZoomedItemIndex = _currentItemIndex;
				}



				var itemsDiff;

				if (gestureType === 'swipe') {
					var totalShiftDist = _currPoint.x - _startPoint.x,
						isFastLastFlick = _releaseAnimData.lastFlickDist.x < 10;

					// if container is shifted for more than MIN_SWIPE_DISTANCE, 
					// and last flick gesture was in right direction
					if (totalShiftDist > MIN_SWIPE_DISTANCE &&
						(isFastLastFlick || _releaseAnimData.lastFlickOffset.x > 20)) {
						// go to prev item
						itemsDiff = -1;
					} else if (totalShiftDist < -MIN_SWIPE_DISTANCE &&
						(isFastLastFlick || _releaseAnimData.lastFlickOffset.x < -20)) {
						// go to next item
						itemsDiff = 1;
					}
				}

				var nextCircle;

				if (itemsDiff) {

					_currentItemIndex += itemsDiff;

					if (_currentItemIndex < 0) {
						_currentItemIndex = _options.loop ? _getNumItems() - 1 : 0;
						nextCircle = true;
					} else if (_currentItemIndex >= _getNumItems()) {
						_currentItemIndex = _options.loop ? 0 : _getNumItems() - 1;
						nextCircle = true;
					}

					if (!nextCircle || _options.loop) {
						_indexDiff += itemsDiff;
						_currPositionIndex -= itemsDiff;
						itemChanged = true;
					}



				}

				var animateToX = _slideSize.x * _currPositionIndex;
				var animateToDist = Math.abs(animateToX - _mainScrollPos.x);
				var finishAnimDuration;


				if (!itemChanged && animateToX > _mainScrollPos.x !== _releaseAnimData.lastFlickSpeed.x > 0) {
					// "return to current" duration, e.g. when dragging from slide 0 to -1
					finishAnimDuration = 333;
				} else {
					finishAnimDuration = Math.abs(_releaseAnimData.lastFlickSpeed.x) > 0 ?
						animateToDist / Math.abs(_releaseAnimData.lastFlickSpeed.x) :
						333;

					finishAnimDuration = Math.min(finishAnimDuration, 400);
					finishAnimDuration = Math.max(finishAnimDuration, 250);
				}

				if (_currZoomedItemIndex === _currentItemIndex) {
					itemChanged = false;
				}

				_mainScrollAnimating = true;

				_shout('mainScrollAnimStart');

				_animateProp('mainScroll', _mainScrollPos.x, animateToX, finishAnimDuration, framework.easing.cubic.out,
					_moveMainScroll,
					function () {
						_stopAllAnimations();
						_mainScrollAnimating = false;
						_currZoomedItemIndex = -1;

						if (itemChanged || _currZoomedItemIndex !== _currentItemIndex) {
							self.updateCurrItem();
						}

						_shout('mainScrollAnimComplete');
					}
				);

				if (itemChanged) {
					self.updateCurrItem(true);
				}

				return itemChanged;
			},

			_calculateZoomLevel = function (touchesDistance) {
				return 1 / _startPointsDistance * touchesDistance * _startZoomLevel;
			},

			// Resets zoom if it's out of bounds
			_completeZoomGesture = function () {
				var destZoomLevel = _currZoomLevel,
					minZoomLevel = _getMinZoomLevel(),
					maxZoomLevel = _getMaxZoomLevel();

				if (_currZoomLevel < minZoomLevel) {
					destZoomLevel = minZoomLevel;
				} else if (_currZoomLevel > maxZoomLevel) {
					destZoomLevel = maxZoomLevel;
				}

				var destOpacity = 1,
					onUpdate,
					initialOpacity = _bgOpacity;

				if (_opacityChanged && !_isZoomingIn && !_wasOverInitialZoom && _currZoomLevel < minZoomLevel) {
					//_closedByScroll = true;
					self.close();
					return true;
				}

				if (_opacityChanged) {
					onUpdate = function (now) {
						_applyBgOpacity((destOpacity - initialOpacity) * now + initialOpacity);
					};
				}

				self.zoomTo(destZoomLevel, 0, 200, framework.easing.cubic.out, onUpdate);
				return true;
			};


		_registerModule('Gestures', {
			publicMethods: {

				initGestures: function () {

					// helper function that builds touch/pointer/mouse events
					var addEventNames = function (pref, down, move, up, cancel) {
						_dragStartEvent = pref + down;
						_dragMoveEvent = pref + move;
						_dragEndEvent = pref + up;
						if (cancel) {
							_dragCancelEvent = pref + cancel;
						} else {
							_dragCancelEvent = '';
						}
					};

					_pointerEventEnabled = _features.pointerEvent;
					if (_pointerEventEnabled && _features.touch) {
						// we don't need touch events, if browser supports pointer events
						_features.touch = false;
					}

					if (_pointerEventEnabled) {
						if (navigator.msPointerEnabled) {
							// IE10 pointer events are case-sensitive
							addEventNames('MSPointer', 'Down', 'Move', 'Up', 'Cancel');
						} else {
							addEventNames('pointer', 'down', 'move', 'up', 'cancel');
						}
					} else if (_features.touch) {
						addEventNames('touch', 'start', 'move', 'end', 'cancel');
						_likelyTouchDevice = true;
					} else {
						addEventNames('mouse', 'down', 'move', 'up');
					}

					_upMoveEvents = _dragMoveEvent + ' ' + _dragEndEvent + ' ' + _dragCancelEvent;
					_downEvents = _dragStartEvent;

					if (_pointerEventEnabled && !_likelyTouchDevice) {
						_likelyTouchDevice = (navigator.maxTouchPoints > 1) || (navigator.msMaxTouchPoints > 1);
					}
					// make variable public
					self.likelyTouchDevice = _likelyTouchDevice;

					_globalEventHandlers[_dragStartEvent] = _onDragStart;
					_globalEventHandlers[_dragMoveEvent] = _onDragMove;
					_globalEventHandlers[_dragEndEvent] = _onDragRelease; // the Kraken

					if (_dragCancelEvent) {
						_globalEventHandlers[_dragCancelEvent] = _globalEventHandlers[_dragEndEvent];
					}

					// Bind mouse events on device with detected hardware touch support, in case it supports multiple types of input.
					if (_features.touch) {
						_downEvents += ' mousedown';
						_upMoveEvents += ' mousemove mouseup';
						_globalEventHandlers.mousedown = _globalEventHandlers[_dragStartEvent];
						_globalEventHandlers.mousemove = _globalEventHandlers[_dragMoveEvent];
						_globalEventHandlers.mouseup = _globalEventHandlers[_dragEndEvent];
					}

					if (!_likelyTouchDevice) {
						// don't allow pan to next slide from zoomed state on Desktop
						_options.allowPanToNext = false;
					}
				}

			}
		});


		/*>>gestures*/

		/*>>show-hide-transition*/
		/**
		 * show-hide-transition.js:
		 *
		 * Manages initial opening or closing transition.
		 *
		 * If you're not planning to use transition for gallery at all,
		 * you may set options hideAnimationDuration and showAnimationDuration to 0,
		 * and just delete startAnimation function.
		 * 
		 */


		var _showOrHideTimeout,
			_showOrHide = function (item, img, out, completeFn) {

				if (_showOrHideTimeout) {
					clearTimeout(_showOrHideTimeout);
				}

				_initialZoomRunning = true;
				_initialContentSet = true;

				// dimensions of small thumbnail {x:,y:,w:}.
				// Height is optional, as calculated based on large image.
				var thumbBounds;
				if (item.initialLayout) {
					thumbBounds = item.initialLayout;
					item.initialLayout = null;
				} else {
					thumbBounds = _options.getThumbBoundsFn && _options.getThumbBoundsFn(_currentItemIndex);
				}

				var duration = out ? _options.hideAnimationDuration : _options.showAnimationDuration;

				var onComplete = function () {
					_stopAnimation('initialZoom');
					if (!out) {
						_applyBgOpacity(1);
						if (img) {
							img.style.display = 'block';
						}
						framework.addClass(template, 'pswp--animated-in');
						_shout('initialZoom' + (out ? 'OutEnd' : 'InEnd'));
					} else {
						self.template.removeAttribute('style');
						self.bg.removeAttribute('style');
					}

					if (completeFn) {
						completeFn();
					}
					_initialZoomRunning = false;
				};

				// if bounds aren't provided, just open gallery without animation
				if (!duration || !thumbBounds || thumbBounds.x === undefined) {

					_shout('initialZoom' + (out ? 'Out' : 'In'));

					_currZoomLevel = item.initialZoomLevel;
					_equalizePoints(_panOffset, item.initialPosition);
					_applyCurrentZoomPan();

					template.style.opacity = out ? 0 : 1;
					_applyBgOpacity(1);

					if (duration) {
						setTimeout(function () {
							onComplete();
						}, duration);
					} else {
						onComplete();
					}

					return;
				}

				var startAnimation = function () {
					var closeWithRaf = _closedByScroll,
						fadeEverything = !self.currItem.src || self.currItem.loadError || _options.showHideOpacity;

					// apply hw-acceleration to image
					if (item.miniImg) {
						item.miniImg.style.webkitBackfaceVisibility = 'hidden';
					}

					if (!out) {
						_currZoomLevel = thumbBounds.w / item.w;
						_panOffset.x = thumbBounds.x;
						_panOffset.y = thumbBounds.y - _initalWindowScrollY;

						self[fadeEverything ? 'template' : 'bg'].style.opacity = 0.001;
						_applyCurrentZoomPan();
					}

					_registerStartAnimation('initialZoom');

					if (out && !closeWithRaf) {
						framework.removeClass(template, 'pswp--animated-in');
					}

					if (fadeEverything) {
						if (out) {
							framework[(closeWithRaf ? 'remove' : 'add') + 'Class'](template, 'pswp--animate_opacity');
						} else {
							setTimeout(function () {
								framework.addClass(template, 'pswp--animate_opacity');
							}, 30);
						}
					}

					_showOrHideTimeout = setTimeout(function () {

						_shout('initialZoom' + (out ? 'Out' : 'In'));


						if (!out) {

							// "in" animation always uses CSS transitions (instead of rAF).
							// CSS transition work faster here, 
							// as developer may also want to animate other things, 
							// like ui on top of sliding area, which can be animated just via CSS

							_currZoomLevel = item.initialZoomLevel;
							_equalizePoints(_panOffset, item.initialPosition);
							_applyCurrentZoomPan();
							_applyBgOpacity(1);

							if (fadeEverything) {
								template.style.opacity = 1;
							} else {
								_applyBgOpacity(1);
							}

							_showOrHideTimeout = setTimeout(onComplete, duration + 20);
						} else {

							// "out" animation uses rAF only when PhotoSwipe is closed by browser scroll, to recalculate position
							var destZoomLevel = thumbBounds.w / item.w,
								initialPanOffset = {
									x: _panOffset.x,
									y: _panOffset.y
								},
								initialZoomLevel = _currZoomLevel,
								initalBgOpacity = _bgOpacity,
								onUpdate = function (now) {

									if (now === 1) {
										_currZoomLevel = destZoomLevel;
										_panOffset.x = thumbBounds.x;
										_panOffset.y = thumbBounds.y - _currentWindowScrollY;
									} else {
										_currZoomLevel = (destZoomLevel - initialZoomLevel) * now + initialZoomLevel;
										_panOffset.x = (thumbBounds.x - initialPanOffset.x) * now + initialPanOffset.x;
										_panOffset.y = (thumbBounds.y - _currentWindowScrollY - initialPanOffset.y) * now + initialPanOffset.y;
									}

									_applyCurrentZoomPan();
									if (fadeEverything) {
										template.style.opacity = 1 - now;
									} else {
										_applyBgOpacity(initalBgOpacity - now * initalBgOpacity);
									}
								};

							if (closeWithRaf) {
								_animateProp('initialZoom', 0, 1, duration, framework.easing.cubic.out, onUpdate, onComplete);
							} else {
								onUpdate(1);
								_showOrHideTimeout = setTimeout(onComplete, duration + 20);
							}
						}

					}, out ? 25 : 90); // Main purpose of this delay is to give browser time to paint and
					// create composite layers of PhotoSwipe UI parts (background, controls, caption, arrows).
					// Which avoids lag at the beginning of scale transition.
				};
				startAnimation();


			};

		/*>>show-hide-transition*/

		/*>>items-controller*/
		/**
		*
		* Controller manages gallery items, their dimensions, and their content.
		* 
		*/

		var _items,
			_tempPanAreaSize = {},
			_imagesToAppendPool = [],
			_initialContentSet,
			_initialZoomRunning,
			_controllerDefaultOptions = {
				index: 0,
				errorMsg: '<div class="pswp__error-msg"><a href="%url%" target="_blank">The image</a> could not be loaded.</div>',
				forceProgressiveLoading: false, // TODO
				preload: [1, 1],
				getNumItemsFn: function () {
					return _items.length;
				}
			};


		var _getItemAt,
			_getNumItems,
			_initialIsLoop,
			_getZeroBounds = function () {
				return {
					center: { x: 0, y: 0 },
					max: { x: 0, y: 0 },
					min: { x: 0, y: 0 }
				};
			},
			_calculateSingleItemPanBounds = function (item, realPanElementW, realPanElementH) {
				var bounds = item.bounds;

				// position of element when it's centered
				bounds.center.x = Math.round((_tempPanAreaSize.x - realPanElementW) / 2);
				bounds.center.y = Math.round((_tempPanAreaSize.y - realPanElementH) / 2) + item.vGap.top;

				// maximum pan position
				bounds.max.x = (realPanElementW > _tempPanAreaSize.x) ?
					Math.round(_tempPanAreaSize.x - realPanElementW) :
					bounds.center.x;

				bounds.max.y = (realPanElementH > _tempPanAreaSize.y) ?
					Math.round(_tempPanAreaSize.y - realPanElementH) + item.vGap.top :
					bounds.center.y;

				// minimum pan position
				bounds.min.x = (realPanElementW > _tempPanAreaSize.x) ? 0 : bounds.center.x;
				bounds.min.y = (realPanElementH > _tempPanAreaSize.y) ? item.vGap.top : bounds.center.y;
			},
			_calculateItemSize = function (item, viewportSize, zoomLevel) {

				if (item.src && !item.loadError) {
					var isInitial = !zoomLevel;

					if (isInitial) {
						if (!item.vGap) {
							item.vGap = { top: 0, bottom: 0 };
						}
						// allows overriding vertical margin for individual items
						_shout('parseVerticalMargin', item);
					}


					_tempPanAreaSize.x = viewportSize.x;
					_tempPanAreaSize.y = viewportSize.y - item.vGap.top - item.vGap.bottom;

					if (isInitial) {
						var hRatio = _tempPanAreaSize.x / item.w;
						var vRatio = _tempPanAreaSize.y / item.h;

						item.fitRatio = hRatio < vRatio ? hRatio : vRatio;
						//item.fillRatio = hRatio > vRatio ? hRatio : vRatio;

						var scaleMode = _options.scaleMode;

						if (scaleMode === 'orig') {
							zoomLevel = 1;
						} else if (scaleMode === 'fit') {
							zoomLevel = item.fitRatio;
						}

						if (zoomLevel > 1) {
							zoomLevel = 1;
						}

						item.initialZoomLevel = zoomLevel;

						if (!item.bounds) {
							// reuse bounds object
							item.bounds = _getZeroBounds();
						}
					}

					if (!zoomLevel) {
						return;
					}

					_calculateSingleItemPanBounds(item, item.w * zoomLevel, item.h * zoomLevel);

					if (isInitial && zoomLevel === item.initialZoomLevel) {
						item.initialPosition = item.bounds.center;
					}

					return item.bounds;
				} else {
					item.w = item.h = 0;
					item.initialZoomLevel = item.fitRatio = 1;
					item.bounds = _getZeroBounds();
					item.initialPosition = item.bounds.center;

					// if it's not image, we return zero bounds (content is not zoomable)
					return item.bounds;
				}

			},




			_appendImage = function (index, item, baseDiv, img, preventAnimation, keepPlaceholder) {


				if (item.loadError) {
					return;
				}

				if (img) {

					item.imageAppended = true;
					_setImageSize(item, img, (item === self.currItem && _renderMaxResolution));

					baseDiv.appendChild(img);

					if (keepPlaceholder) {
						setTimeout(function () {
							if (item && item.loaded && item.placeholder) {
								item.placeholder.style.display = 'none';
								item.placeholder = null;
							}
						}, 500);
					}
				}
			},



			_preloadImage = function (item) {
				item.loading = true;
				item.loaded = false;
				var img = item.img = framework.createEl('pswp__img', 'img');
				var onComplete = function () {
					item.loading = false;
					item.loaded = true;

					if (item.loadComplete) {
						item.loadComplete(item);
					} else {
						item.img = null; // no need to store image object
					}
					img.onload = img.onerror = null;
					img = null;
				};
				img.onload = onComplete;
				img.onerror = function () {
					item.loadError = true;
					onComplete();
				};

				img.src = item.src;// + '?a=' + Math.random();
				img.alt = item.alt || '';

				return img;
			},
			_checkForError = function (item, cleanUp) {
				if (item.src && item.loadError && item.container) {

					if (cleanUp) {
						item.container.innerHTML = '';
					}

					item.container.innerHTML = _options.errorMsg.replace('%url%', item.src);
					return true;

				}
			},
			_setImageSize = function (item, img, maxRes) {
				if (!item.src) {
					return;
				}

				if (!img) {
					img = item.container.lastChild;
				}

				var w = maxRes ? item.w : Math.round(item.w * item.fitRatio),
					h = maxRes ? item.h : Math.round(item.h * item.fitRatio);

				if (item.placeholder && !item.loaded) {
					item.placeholder.style.width = w + 'px';
					item.placeholder.style.height = h + 'px';
				}

				img.style.width = w + 'px';
				img.style.height = h + 'px';
			},
			_appendImagesPool = function () {

				if (_imagesToAppendPool.length) {
					var poolItem;

					for (var i = 0; i < _imagesToAppendPool.length; i++) {
						poolItem = _imagesToAppendPool[i];
						if (poolItem.holder.index === poolItem.index) {
							_appendImage(poolItem.index, poolItem.item, poolItem.baseDiv, poolItem.img, false, poolItem.clearPlaceholder);
						}
					}
					_imagesToAppendPool = [];
				}
			};



		_registerModule('Controller', {

			publicMethods: {

				lazyLoadItem: function (index) {
					index = _getLoopedId(index);
					var item = _getItemAt(index);

					if (!item || ((item.loaded || item.loading) && !_itemsNeedUpdate)) {
						return;
					}

					_shout('gettingData', index, item);

					if (!item.src) {
						return;
					}

					_preloadImage(item);
				},
				initController: function () {
					framework.extend(_options, _controllerDefaultOptions, true);
					self.items = _items = items;
					_getItemAt = self.getItemAt;
					_getNumItems = _options.getNumItemsFn; //self.getNumItems;



					_initialIsLoop = _options.loop;
					if (_getNumItems() < 3) {
						_options.loop = false; // disable loop if less then 3 items
					}

					_listen('beforeChange', function (diff) {

						var p = _options.preload,
							isNext = diff === null ? true : (diff >= 0),
							preloadBefore = Math.min(p[0], _getNumItems()),
							preloadAfter = Math.min(p[1], _getNumItems()),
							i;


						for (i = 1; i <= (isNext ? preloadAfter : preloadBefore); i++) {
							self.lazyLoadItem(_currentItemIndex + i);
						}
						for (i = 1; i <= (isNext ? preloadBefore : preloadAfter); i++) {
							self.lazyLoadItem(_currentItemIndex - i);
						}
					});

					_listen('initialLayout', function () {
						self.currItem.initialLayout = _options.getThumbBoundsFn && _options.getThumbBoundsFn(_currentItemIndex);
					});

					_listen('mainScrollAnimComplete', _appendImagesPool);
					_listen('initialZoomInEnd', _appendImagesPool);



					_listen('destroy', function () {
						var item;
						for (var i = 0; i < _items.length; i++) {
							item = _items[i];
							// remove reference to DOM elements, for GC
							if (item.container) {
								item.container = null;
							}
							if (item.placeholder) {
								item.placeholder = null;
							}
							if (item.img) {
								item.img = null;
							}
							if (item.preloader) {
								item.preloader = null;
							}
							if (item.loadError) {
								item.loaded = item.loadError = false;
							}
						}
						_imagesToAppendPool = null;
					});
				},


				getItemAt: function (index) {
					if (index >= 0) {
						return _items[index] !== undefined ? _items[index] : false;
					}
					return false;
				},

				allowProgressiveImg: function () {
					// 1. Progressive image loading isn't working on webkit/blink 
					//    when hw-acceleration (e.g. translateZ) is applied to IMG element.
					//    That's why in PhotoSwipe parent element gets zoom transform, not image itself.
					//    
					// 2. Progressive image loading sometimes blinks in webkit/blink when applying animation to parent element.
					//    That's why it's disabled on touch devices (mainly because of swipe transition)
					//    
					// 3. Progressive image loading sometimes doesn't work in IE (up to 11).

					// Don't allow progressive loading on non-large touch devices
					return _options.forceProgressiveLoading || !_likelyTouchDevice || _options.mouseUsed || screen.width > 1200;
					// 1200 - to eliminate touch devices with large screen (like Chromebook Pixel)
				},

				setContent: function (holder, index) {

					if (_options.loop) {
						index = _getLoopedId(index);
					}

					var prevItem = self.getItemAt(holder.index);
					if (prevItem) {
						prevItem.container = null;
					}

					var item = self.getItemAt(index),
						img;

					if (!item) {
						holder.el.innerHTML = '';
						return;
					}

					// allow to override data
					_shout('gettingData', index, item);

					holder.index = index;
					holder.item = item;

					// base container DIV is created only once for each of 3 holders
					var baseDiv = item.container = framework.createEl('pswp__zoom-wrap');



					if (!item.src && item.html) {
						if (item.html.tagName) {
							baseDiv.appendChild(item.html);
						} else {
							baseDiv.innerHTML = item.html;
						}
					}

					_checkForError(item);

					_calculateItemSize(item, _viewportSize);

					if (item.src && !item.loadError && !item.loaded) {

						item.loadComplete = function (item) {

							// gallery closed before image finished loading
							if (!_isOpen) {
								return;
							}

							// check if holder hasn't changed while image was loading
							if (holder && holder.index === index) {
								if (_checkForError(item, true)) {
									item.loadComplete = item.img = null;
									_calculateItemSize(item, _viewportSize);
									_applyZoomPanToItem(item);

									if (holder.index === _currentItemIndex) {
										// recalculate dimensions
										self.updateCurrZoomItem();
									}
									return;
								}
								if (!item.imageAppended) {
									if (_features.transform && (_mainScrollAnimating || _initialZoomRunning)) {
										_imagesToAppendPool.push({
											item: item,
											baseDiv: baseDiv,
											img: item.img,
											index: index,
											holder: holder,
											clearPlaceholder: true
										});
									} else {
										_appendImage(index, item, baseDiv, item.img, _mainScrollAnimating || _initialZoomRunning, true);
									}
								} else {
									// remove preloader & mini-img
									if (!_initialZoomRunning && item.placeholder) {
										item.placeholder.style.display = 'none';
										item.placeholder = null;
									}
								}
							}

							item.loadComplete = null;
							item.img = null; // no need to store image element after it's added

							_shout('imageLoadComplete', index, item);
						};

						if (framework.features.transform) {

							var placeholderClassName = 'pswp__img pswp__img--placeholder';
							placeholderClassName += (item.msrc ? '' : ' pswp__img--placeholder--blank');

							var placeholder = framework.createEl(placeholderClassName, item.msrc ? 'img' : '');
							if (item.msrc) {
								placeholder.src = item.msrc;
							}

							_setImageSize(item, placeholder);

							baseDiv.appendChild(placeholder);
							item.placeholder = placeholder;

						}




						if (!item.loading) {
							_preloadImage(item);
						}


						if (self.allowProgressiveImg()) {
							// just append image
							if (!_initialContentSet && _features.transform) {
								_imagesToAppendPool.push({
									item: item,
									baseDiv: baseDiv,
									img: item.img,
									index: index,
									holder: holder
								});
							} else {
								_appendImage(index, item, baseDiv, item.img, true, true);
							}
						}

					} else if (item.src && !item.loadError) {
						// image object is created every time, due to bugs of image loading & delay when switching images
						img = framework.createEl('pswp__img', 'img');
						img.style.opacity = 1;
						img.src = item.src;
						_setImageSize(item, img);
						_appendImage(index, item, baseDiv, img, true);
					}


					if (!_initialContentSet && index === _currentItemIndex) {
						_currZoomElementStyle = baseDiv.style;
						_showOrHide(item, (img || item.img));
					} else {
						_applyZoomPanToItem(item);
					}

					holder.el.innerHTML = '';
					holder.el.appendChild(baseDiv);
				},

				cleanSlide: function (item) {
					if (item.img) {
						item.img.onload = item.img.onerror = null;
					}
					item.loaded = item.loading = item.img = item.imageAppended = false;
				}

			}
		});

		/*>>items-controller*/

		/*>>tap*/
		/**
		 * tap.js:
		 *
		 * Displatches tap and double-tap events.
		 * 
		 */

		var tapTimer,
			tapReleasePoint = {},
			_dispatchTapEvent = function (origEvent, releasePoint, pointerType) {
				var e = document.createEvent('CustomEvent'),
					eDetail = {
						origEvent: origEvent,
						target: origEvent.target,
						releasePoint: releasePoint,
						pointerType: pointerType || 'touch'
					};

				e.initCustomEvent('pswpTap', true, true, eDetail);
				origEvent.target.dispatchEvent(e);
			};

		_registerModule('Tap', {
			publicMethods: {
				initTap: function () {
					_listen('firstTouchStart', self.onTapStart);
					_listen('touchRelease', self.onTapRelease);
					_listen('destroy', function () {
						tapReleasePoint = {};
						tapTimer = null;
					});
				},
				onTapStart: function (touchList) {
					if (touchList.length > 1) {
						clearTimeout(tapTimer);
						tapTimer = null;
					}
				},
				onTapRelease: function (e, releasePoint) {
					if (!releasePoint) {
						return;
					}

					if (!_moved && !_isMultitouch && !_numAnimations) {
						var p0 = releasePoint;
						if (tapTimer) {
							clearTimeout(tapTimer);
							tapTimer = null;

							// Check if taped on the same place
							if (_isNearbyPoints(p0, tapReleasePoint)) {
								_shout('doubleTap', p0);
								return;
							}
						}

						if (releasePoint.type === 'mouse') {
							_dispatchTapEvent(e, releasePoint, 'mouse');
							return;
						}

						var clickedTagName = e.target.tagName.toUpperCase();
						// avoid double tap delay on buttons and elements that have class pswp__single-tap
						if (clickedTagName === 'BUTTON' || framework.hasClass(e.target, 'pswp__single-tap')) {
							_dispatchTapEvent(e, releasePoint);
							return;
						}

						_equalizePoints(tapReleasePoint, p0);

						tapTimer = setTimeout(function () {
							_dispatchTapEvent(e, releasePoint);
							tapTimer = null;
						}, 300);
					}
				}
			}
		});

		/*>>tap*/

		/*>>desktop-zoom*/
		/**
		 *
		 * desktop-zoom.js:
		 *
		 * - Binds mousewheel event for paning zoomed image.
		 * - Manages "dragging", "zoomed-in", "zoom-out" classes.
		 *   (which are used for cursors and zoom icon)
		 * - Adds toggleDesktopZoom function.
		 * 
		 */

		var _wheelDelta;

		_registerModule('DesktopZoom', {

			publicMethods: {

				initDesktopZoom: function () {

					if (_oldIE) {
						// no zoom for old IE (<=8)
						return;
					}

					if (_likelyTouchDevice) {
						// if detected hardware touch support, we wait until mouse is used,
						// and only then apply desktop-zoom features
						_listen('mouseUsed', function () {
							self.setupDesktopZoom();
						});
					} else {
						self.setupDesktopZoom(true);
					}

				},

				setupDesktopZoom: function (onInit) {

					_wheelDelta = {};

					var events = 'wheel mousewheel DOMMouseScroll';

					_listen('bindEvents', function () {
						framework.bind(template, events, self.handleMouseWheel);
					});

					_listen('unbindEvents', function () {
						if (_wheelDelta) {
							framework.unbind(template, events, self.handleMouseWheel);
						}
					});

					self.mouseZoomedIn = false;

					var hasDraggingClass,
						updateZoomable = function () {
							if (self.mouseZoomedIn) {
								framework.removeClass(template, 'pswp--zoomed-in');
								self.mouseZoomedIn = false;
							}
							if (_currZoomLevel < 1) {
								framework.addClass(template, 'pswp--zoom-allowed');
							} else {
								framework.removeClass(template, 'pswp--zoom-allowed');
							}
							removeDraggingClass();
						},
						removeDraggingClass = function () {
							if (hasDraggingClass) {
								framework.removeClass(template, 'pswp--dragging');
								hasDraggingClass = false;
							}
						};

					_listen('resize', updateZoomable);
					_listen('afterChange', updateZoomable);
					_listen('pointerDown', function () {
						if (self.mouseZoomedIn) {
							hasDraggingClass = true;
							framework.addClass(template, 'pswp--dragging');
						}
					});
					_listen('pointerUp', removeDraggingClass);

					if (!onInit) {
						updateZoomable();
					}

				},

				handleMouseWheel: function (e) {

					if (_currZoomLevel <= self.currItem.fitRatio) {
						if (_options.modal) {

							if (!_options.closeOnScroll || _numAnimations || _isDragging) {
								e.preventDefault();
							} else if (_transformKey && Math.abs(e.deltaY) > 2) {
								// close PhotoSwipe
								// if browser supports transforms & scroll changed enough
								_closedByScroll = true;
								self.close();
							}

						}
						return true;
					}

					// allow just one event to fire
					e.stopPropagation();

					// https://developer.mozilla.org/en-US/docs/Web/Events/wheel
					_wheelDelta.x = 0;

					if ('deltaX' in e) {
						if (e.deltaMode === 1 /* DOM_DELTA_LINE */) {
							// 18 - average line height
							_wheelDelta.x = e.deltaX * 18;
							_wheelDelta.y = e.deltaY * 18;
						} else {
							_wheelDelta.x = e.deltaX;
							_wheelDelta.y = e.deltaY;
						}
					} else if ('wheelDelta' in e) {
						if (e.wheelDeltaX) {
							_wheelDelta.x = -0.16 * e.wheelDeltaX;
						}
						if (e.wheelDeltaY) {
							_wheelDelta.y = -0.16 * e.wheelDeltaY;
						} else {
							_wheelDelta.y = -0.16 * e.wheelDelta;
						}
					} else if ('detail' in e) {
						_wheelDelta.y = e.detail;
					} else {
						return;
					}

					_calculatePanBounds(_currZoomLevel, true);

					var newPanX = _panOffset.x - _wheelDelta.x,
						newPanY = _panOffset.y - _wheelDelta.y;

					// only prevent scrolling in nonmodal mode when not at edges
					if (_options.modal ||
						(
							newPanX <= _currPanBounds.min.x && newPanX >= _currPanBounds.max.x &&
							newPanY <= _currPanBounds.min.y && newPanY >= _currPanBounds.max.y
						)) {
						e.preventDefault();
					}

					// TODO: use rAF instead of mousewheel?
					self.panTo(newPanX, newPanY);
				},

				toggleDesktopZoom: function (centerPoint) {
					centerPoint = centerPoint || { x: _viewportSize.x / 2 + _offset.x, y: _viewportSize.y / 2 + _offset.y };

					var doubleTapZoomLevel = _options.getDoubleTapZoom(true, self.currItem);
					var zoomOut = _currZoomLevel === doubleTapZoomLevel;

					self.mouseZoomedIn = !zoomOut;

					self.zoomTo(zoomOut ? self.currItem.initialZoomLevel : doubleTapZoomLevel, centerPoint, 333);
					framework[(!zoomOut ? 'add' : 'remove') + 'Class'](template, 'pswp--zoomed-in');
				}

			}
		});


		/*>>desktop-zoom*/

		/*>>history*/
		/**
		 *
		 * history.js:
		 *
		 * - Back button to close gallery.
		 * 
		 * - Unique URL for each slide: example.com/&pid=1&gid=3
		 *   (where PID is picture index, and GID and gallery index)
		 *   
		 * - Switch URL when slides change.
		 * 
		 */


		var _historyDefaultOptions = {
			history: true,
			galleryUID: 1
		};

		var _historyUpdateTimeout,
			_hashChangeTimeout,
			_hashAnimCheckTimeout,
			_hashChangedByScript,
			_hashChangedByHistory,
			_hashReseted,
			_initialHash,
			_historyChanged,
			_closedFromURL,
			_urlChangedOnce,
			_windowLoc,

			_supportsPushState,

			_getHash = function () {
				return _windowLoc.hash.substring(1);
			},
			_cleanHistoryTimeouts = function () {

				if (_historyUpdateTimeout) {
					clearTimeout(_historyUpdateTimeout);
				}

				if (_hashAnimCheckTimeout) {
					clearTimeout(_hashAnimCheckTimeout);
				}
			},

			// pid - Picture index
			// gid - Gallery index
			_parseItemIndexFromURL = function () {
				var hash = _getHash(),
					params = {};

				if (hash.length < 5) { // pid=1
					return params;
				}

				var i, vars = hash.split('&');
				for (i = 0; i < vars.length; i++) {
					if (!vars[i]) {
						continue;
					}
					var pair = vars[i].split('=');
					if (pair.length < 2) {
						continue;
					}
					params[pair[0]] = pair[1];
				}
				if (_options.galleryPIDs) {
					// detect custom pid in hash and search for it among the items collection
					var searchfor = params.pid;
					params.pid = 0; // if custom pid cannot be found, fallback to the first item
					for (i = 0; i < _items.length; i++) {
						if (_items[i].pid === searchfor) {
							params.pid = i;
							break;
						}
					}
				} else {
					params.pid = parseInt(params.pid, 10) - 1;
				}
				if (params.pid < 0) {
					params.pid = 0;
				}
				return params;
			},
			_updateHash = function () {

				if (_hashAnimCheckTimeout) {
					clearTimeout(_hashAnimCheckTimeout);
				}


				if (_numAnimations || _isDragging) {
					// changing browser URL forces layout/paint in some browsers, which causes noticable lag during animation
					// that's why we update hash only when no animations running
					_hashAnimCheckTimeout = setTimeout(_updateHash, 500);
					return;
				}

				if (_hashChangedByScript) {
					clearTimeout(_hashChangeTimeout);
				} else {
					_hashChangedByScript = true;
				}


				var pid = (_currentItemIndex + 1);
				var item = _getItemAt(_currentItemIndex);
				if (item.hasOwnProperty('pid')) {
					// carry forward any custom pid assigned to the item
					pid = item.pid;
				}
				var newHash = _initialHash + '&' + 'gid=' + _options.galleryUID + '&' + 'pid=' + pid;

				if (!_historyChanged) {
					if (_windowLoc.hash.indexOf(newHash) === -1) {
						_urlChangedOnce = true;
					}
					// first time - add new hisory record, then just replace
				}

				var newURL = _windowLoc.href.split('#')[0] + '#' + newHash;

				if (_supportsPushState) {

					if ('#' + newHash !== window.location.hash) {
						history[_historyChanged ? 'replaceState' : 'pushState']('', document.title, newURL);
					}

				} else {
					if (_historyChanged) {
						_windowLoc.replace(newURL);
					} else {
						_windowLoc.hash = newHash;
					}
				}



				_historyChanged = true;
				_hashChangeTimeout = setTimeout(function () {
					_hashChangedByScript = false;
				}, 60);
			};





		_registerModule('History', {



			publicMethods: {
				initHistory: function () {

					framework.extend(_options, _historyDefaultOptions, true);

					if (!_options.history) {
						return;
					}


					_windowLoc = window.location;
					_urlChangedOnce = false;
					_closedFromURL = false;
					_historyChanged = false;
					_initialHash = _getHash();
					_supportsPushState = ('pushState' in history);


					if (_initialHash.indexOf('gid=') > -1) {
						_initialHash = _initialHash.split('&gid=')[0];
						_initialHash = _initialHash.split('?gid=')[0];
					}


					_listen('afterChange', self.updateURL);
					_listen('unbindEvents', function () {
						framework.unbind(window, 'hashchange', self.onHashChange);
					});


					var returnToOriginal = function () {
						_hashReseted = true;
						if (!_closedFromURL) {

							if (_urlChangedOnce) {
								history.back();
							} else {

								if (_initialHash) {
									_windowLoc.hash = _initialHash;
								} else {
									if (_supportsPushState) {

										// remove hash from url without refreshing it or scrolling to top
										history.pushState('', document.title, _windowLoc.pathname + _windowLoc.search);
									} else {
										_windowLoc.hash = '';
									}
								}
							}

						}

						_cleanHistoryTimeouts();
					};


					_listen('unbindEvents', function () {
						if (_closedByScroll) {
							// if PhotoSwipe is closed by scroll, we go "back" before the closing animation starts
							// this is done to keep the scroll position
							returnToOriginal();
						}
					});
					_listen('destroy', function () {
						if (!_hashReseted) {
							returnToOriginal();
						}
					});
					_listen('firstUpdate', function () {
						_currentItemIndex = _parseItemIndexFromURL().pid;
					});




					var index = _initialHash.indexOf('pid=');
					if (index > -1) {
						_initialHash = _initialHash.substring(0, index);
						if (_initialHash.slice(-1) === '&') {
							_initialHash = _initialHash.slice(0, -1);
						}
					}


					setTimeout(function () {
						if (_isOpen) { // hasn't destroyed yet
							framework.bind(window, 'hashchange', self.onHashChange);
						}
					}, 40);

				},
				onHashChange: function () {

					if (_getHash() === _initialHash) {

						_closedFromURL = true;
						self.close();
						return;
					}
					if (!_hashChangedByScript) {

						_hashChangedByHistory = true;
						self.goTo(_parseItemIndexFromURL().pid);
						_hashChangedByHistory = false;
					}

				},
				updateURL: function () {

					// Delay the update of URL, to avoid lag during transition, 
					// and to not to trigger actions like "refresh page sound" or "blinking favicon" to often

					_cleanHistoryTimeouts();


					if (_hashChangedByHistory) {
						return;
					}

					if (!_historyChanged) {
						_updateHash(); // first time
					} else {
						_historyUpdateTimeout = setTimeout(_updateHash, 800);
					}
				}

			}
		});


		/*>>history*/
		framework.extend(self, publicMethods);
	};
	return PhotoSwipe;
});

Zerion Mini Shell 1.0