https://www.yagazieemezi.com/static/theme_api/vendor/photoswipe-4.…809202f8dbdc676022e94006f430a0c4792db15c.js

1/*! PhotoSwipe - v4.1.0 - 2015-09-24
2* http://photoswipe.com
3* Copyright (c) 2015 Dmitry Semenov; */
4
5(function (root, factory) {
6	if (typeof define === 'function' && define.amd) {
7		define(factory);
8	} else if (typeof exports === 'object') {
9		module.exports = factory();
10	} else {
11		root.PhotoSwipe = factory();
12	}
13})(this, function () {
14
15	'use strict';
16	var PhotoSwipe = function(template, UiClass, items, options){
17
18/*>>framework-bridge*/
19/**
20 *
21 * Set of generic functions used by gallery.
22 *
23 * You're free to modify anything here as long as functionality is kept.
24 *
25 */
26var framework = {
27	features: null,
28	bind: function(target, type, listener, unbind) {
29		var methodName = (unbind ? 'remove' : 'add') + 'EventListener';
30		type = type.split(' ');
31		for(var i = 0; i < type.length; i++) {
32			if(type[i]) {
33				target[methodName]( type[i], listener, false);
34			}
35		}
36	},
37	isArray: function(obj) {
38		return (obj instanceof Array);
39	},
40	createEl: function(classes, tag) {
41		var el = document.createElement(tag || 'div');
42		if(classes) {
43			el.className = classes;
44		}
45		return el;
46	},
47	getScrollY: function() {
48		var yOffset = window.pageYOffset;
49		return yOffset !== undefined ? yOffset : document.documentElement.scrollTop;
50	},
51	unbind: function(target, type, listener) {
52		framework.bind(target,type,listener,true);
53	},
54	removeClass: function(el, className) {
55		var reg = new RegExp('(\\s|^)' + className + '(\\s|$)');
56		el.className = el.className.replace(reg, ' ').replace(/^\s\s*/, '').replace(/\s\s*$/, '');
57	},
58	addClass: function(el, className) {
59		if( !framework.hasClass(el,className) ) {
60			el.className += (el.className ? ' ' : '') + className;
61		}
62	},
63	hasClass: function(el, className) {
64		return el.className && new RegExp('(^|\\s)' + className + '(\\s|$)').test(el.className);
65	},
66	getChildByClass: function(parentEl, childClassName) {
67		var node = parentEl.firstChild;
68		while(node) {
69			if( framework.hasClass(node, childClassName) ) {
70				return node;
71			}
72			node = node.nextSibling;
73		}
74	},
75	arraySearch: function(array, value, key) {
76		var i = array.length;
77		while(i--) {
78			if(array[i][key] === value) {
79				return i;
80			}
81		}
82		return -1;
83	},
84	extend: function(o1, o2, preventOverwrite) {
85		for (var prop in o2) {
86			if (o2.hasOwnProperty(prop)) {
87				if(preventOverwrite && o1.hasOwnProperty(prop)) {
88					continue;
89				}
90				o1[prop] = o2[prop];
91			}
92		}
93	},
94	easing: {
95		sine: {
96			out: function(k) {
97				return Math.sin(k * (Math.PI / 2));
98			},
99			inOut: function(k) {
100				return - (Math.cos(Math.PI * k) - 1) / 2;
101			}
102		},
103		cubic: {
104			out: function(k) {
105				return --k * k * k + 1;
106			}
107		}
108		/*
109			elastic: {
110				out: function ( k ) {
111
112					var s, a = 0.1, p = 0.4;
113					if ( k === 0 ) return 0;
114					if ( k === 1 ) return 1;
115					if ( !a || a < 1 ) { a = 1; s = p / 4; }
116					else s = p * Math.asin( 1 / a ) / ( 2 * Math.PI );
117					return ( a * Math.pow( 2, - 10 * k) * Math.sin( ( k - s ) * ( 2 * Math.PI ) / p ) + 1 );
118
119				},
120			},
121			back: {
122				out: function ( k ) {
123					var s = 1.70158;
124					return --k * k * ( ( s + 1 ) * k + s ) + 1;
125				}
126			}
127		*/
128	},
129
130	/**
131	 *
132	 * @return {object}
133	 *
134	 * {
135	 *  raf : request animation frame function
136	 *  caf : cancel animation frame function
137	 *  transfrom : transform property key (with vendor), or null if not supported
138	 *  oldIE : IE8 or below
139	 * }
140	 *
141	 */
142	detectFeatures: function() {
143		if(framework.features) {
144			return framework.features;
145		}
146		var helperEl = framework.createEl(),
147			helperStyle = helperEl.style,
148			vendor = '',
149			features = {};
150
151		// IE8 and below
152		features.oldIE = document.all && !document.addEventListener;
153
154		features.touch = 'ontouchstart' in window;
155
156		if(window.requestAnimationFrame) {
157			features.raf = window.requestAnimationFrame;
158			features.caf = window.cancelAnimationFrame;
159		}
160
161		features.pointerEvent = navigator.pointerEnabled || navigator.msPointerEnabled;
162
163		// fix false-positive detection of old Android in new IE
164		// (IE11 ua string contains "Android 4.0")
165
166		if(!features.pointerEvent) {
167
168			var ua = navigator.userAgent;
169
170			// Detect if device is iPhone or iPod and if it's older than 

170iOS 8
171			// http://stackoverflow.com/a/14223920
172			//
173			// This detection is made because of buggy top/bottom toolbars
174			// that don't trigger window.resize event.
175			// For more info refer to _isFixedPosition variable in core.js
176
177			if (/iP(hone|od)/.test(navigator.platform)) {
178				var v = (navigator.appVersion).match(/OS (\d+)_(\d+)_?(\d+)?/);
179				if(v && v.length > 0) {
180					v = parseInt(v[1], 10);
181					if(v >= 1 && v < 8 ) {
182						features.isOldIOSPhone = true;
183					}
184				}
185			}
186
187			// Detect old Android (before KitKat)
188			// due to bugs related to position:fixed
189			// http://stackoverflow.com/questions/7184573/pick-up-the-android-version-in-the-browser-by-javascript
190
191			var match = ua.match(/Android\s([0-9\.]*)/);
192			var androidversion =  match ? match[1] : 0;
193			androidversion = parseFloat(androidversion);
194			if(androidversion >= 1 ) {
195				if(androidversion < 4.4) {
196					features.isOldAndroid = true; // for fixed position bug & performance
197				}
198				features.androidVersion = androidversion; // for touchend bug
199			}

200			features.isMobileOpera = /opera mini|opera mobi/i.test(ua);
201
202			// p.s. yes, yes, UA sniffing is bad, propose your solution for above bugs.
203		}
204
205		var styleChecks = ['transform', 'perspective', 'animationName'],
206			vendors = ['', 'webkit','Moz','ms','O'],
207			styleCheckItem,
208			styleName;
209
210		for(var i = 0; i < 4; i++) {
211			vendor = vendors[i];
212
213			for(var a = 0; a < 3; a++) {
214				styleCheckItem = styleChecks[a];
215
216				// uppercase first letter of property name, if vendor is present
217				styleName = vendor + (vendor ?
218										styleCheckItem.charAt(0).toUpperCase() + styleCheckItem.slice(1) :
219										styleCheckItem);
220
221				if(!features[styleCheckItem] && styleName in helperStyle ) {
222					features[styleCheckItem] = styleName;
223				}
224			}
225
226			if(vendor && !features.raf) {
227				vendor = vendor.toLowerCase();
228				features.raf = window[vendor+'RequestAnimationFrame'];
229				if(features.raf) {
230					features.caf = window[vendor+'CancelAnimationFrame'] ||
231									window[vendor+'CancelRequestAnimationFrame'];
232				}
233			}
234		}
235
236		if(!features.raf) {
237			var lastTime = 0;
238			features.raf = function(fn) {
239				var currTime = new Date().getTime();
240				var timeToCall = Math.max(0, 16 - (currTime - lastTime));
241				var id = window.setTimeout(function() { fn(currTime + timeToCall); }, timeToCall);
242				lastTime = currTime + timeToCall;
243				return id;
244			};
245			features.caf = function(id) { clearTimeout(id); };
246		}
247
248		// Detect SVG support
249		features.svg = !!document.createElementNS &&
250						!!document.createElementNS('http://www.w3.org/2000/svg', 'svg').createSVGRect;
251
252		framework.features = features;
253
254		return features;
255	}
256};
257
258framework.detectFeatures();
259
260// Override addEventListener for old versions of IE
261if(framework.features.oldIE) {
262
263	framework.bind = function(target, type, listener, unbind) {
264
265		type = type.split(' ');
266
267		var methodName = (unbind ? 'detach' : 'attach') + 'Event',
268			evName,
269			_handleEv = function() {
270				listener.handleEvent.call(listener);
271			};
272
273		for(var i = 0; i < type.length; i++) {
274			evName = type[i];
275			if(evName) {
276
277				if(typeof listener === 'object' && listener.handleEvent) {
278					if(!unbind) {
279						listener['oldIE' + evName] = _handleEv;
280					} else {
281						if(!listener['oldIE' + evName]) {
282							return false;
283						}
284					}
285
286					target[methodName]( 'on' + evName, listener['oldIE' + evName]);
287				} else {
288					target[methodName]( 'on' + evName, listener);
289				}
290
291			}
292		}
293	};
294
295}
296
297/*>>framework-bridge*/
298
299/*>>core*/
300//function(template, UiClass, items, options)
301
302var self = this;
303
304/**
305 * Static vars, don't change unless you know what you're doing.
306 */
307var DOUBLE_TAP_RADIUS = 25,
308	NUM_HOLDERS = 3;
309
310/**
311 * Options
312 */
313var _options = {
314	allowPanToNext:true,
315	spacing: 0.12,
316	bgOpacity: 1,
317	mouseUsed: false,
318	loop: true,
319	pinchToClose: true,
320	closeOnScroll: true,
321	closeOnVerticalDrag: true,
322	verticalDragRange: 0.75,
323	hideAnimationDuration: 333,
324	showAnimationDuration: 333,
325	showHideOpacity: false,
326	focus: true,
327	escKey: true,
328	arrowKeys: true,
329	mainScrollEndFriction: 0.35,
330	panEndFriction: 0.35,
331	isClickableElement: function(el) {
332        return el.tagName === 'A';
333    },
334    getDoubleTapZoom: function(isMouseClick, item) {
335    	if(isMouseClick) {
336    		return 1;
337    	} else {
338    		return item.initialZoomLevel < 0.7 ? 1 : 1.33;
339    	}
340    },
341    maxSpreadZoom: 1.33,
342	modal: true,
343
344	// not fully implemented yet
345	scaleMode: 'fit' // TODO
346};
347framework.extend(_options, options);
348
349
350/**
351 * Private helper variables & functions
352 */
353
354var _getEmptyPoint = function() {
355		return {x:0,y:0};
356	};
357
358var _isOpen,
359	_isDestroying,
360	_closedByScroll,
361	_currentItemIndex,
362	_containerStyle,
363	_containerShiftIndex,
364	_currPanDist = _getEmptyPoint(),
365	_startPanOffset = _getEmptyPoint(),
366	_panOffset = _getEmptyPoint(),
367	_upMoveEvents, // drag move, drag end & drag cancel events array
368	_downEvents, // drag start events array
369	_globalEventHandlers,
370	_viewportSize = {},
371	_currZoomLevel,
372	_startZoomLevel,
373	_translatePrefix,
374	_translateSufix,
375	_updateSizeInterval,
376	_itemsNeedUpdate,
377	_currPositionIndex = 0,
378	_offset = {},
379	_slideSize = _getEmptyPoint(), // size of slide area, including spacing
380	_itemHolders,
381	_prevItemIndex,
382	_indexDiff = 0, // difference of indexes since last content update
383	_dragStartEvent,
384	_dragMoveEvent,
385	_dragEndEvent,
386	_dragCancelEvent,
387	_transformKey,
388	_pointerEventEnabled,
389	_isFixedPosition = true,
390	_likelyTouchDevice,
391	_modules = [],
392	_requestAF,
393	_cancelAF,
394	_initalClassName,
395	_initalWindowScrollY,
396	_oldIE,
397	_currentWindowScrollY,
398	_features,
399	_windowVisibleSize = {},
400	_renderMaxResolution = false,
401
402	// Registers PhotoSWipe module (History, Controller ...)
403	_registerModule = function(name, module) {
404		framework.extend(self, module.publicMethods);
405		_modules.push(name);
406	},
407

408	_getLoopedId = function(index) {
409		var numSlides = _getNumItems();
410		if(index > numSlides - 1) {
411			return index - numSlides;
412		} else  if(index < 0) {
413			return numSlides + index;
414		}
415		return index;
416	},
417
418	// Micro bind/trigger
419	_listeners = {},
420	_listen = function(name, fn) {
421		if(!_listeners[name]) {
422			_listeners[name] = [];
423		}
424		return _listeners[name].push(fn);
425	},
426	_shout = function(name) {
427		var listeners = _listeners[name];
428
429		if(listeners) {
430			var args = Array.prototype.slice.call(arguments);
431			args.shift();
432
433			for(var i = 0; i < listeners.length; i++) {
434				listeners[i].apply(self, args);
435			}
436		}
437	},
438
439	_getCurrentTime = function() {
440		return new Date().getTime();
441	},
442	_applyBgOpacity = function(opacity) {
443		_bgOpacity = opacity;
444		self.bg.style.opacity = opacity * _options.bgOpacity;
445	},
446
447	_applyZoomTransform = function(styleObj,x,y,zoom,item) {
448		if(!_renderMaxResolution || (item && item !== self.currItem) ) {
449			zoom = zoom / (item ? item.fitRatio : self.currItem.fitRatio);
450		}
451
452		styleObj[_transformKey] = _translatePrefix + x + 'px, ' + y + 'px' + _translateSufix + ' scale(' + zoom + ')';
453	},
454	_applyCurrentZoomPan = function( allowRenderResolution ) {
455		if(_currZoomElementStyle) {
456
457			if(allowRenderResolution) {
458				if(_currZoomLevel > self.currItem.fitRatio) {
459					if(!_renderMaxResolution) {
460						_setImageSize(self.currItem, false, true);
461						_renderMaxResolution = true;
462					}
463				} else {
464					if(_renderMaxResolution) {
465						_setImageSize(self.currItem);
466						_renderMaxResolution = false;
467					}
468				}
469			}
470
471
472			_applyZoomTransform(_currZoomElementStyle, _panOffset.x, _panOffset.y, _currZoomLevel);
473		}
474	},
475	_applyZoomPanToItem = function(item) {
476		if(item.container) {
477
478			_applyZoomTransform(item.container.style,
479								item.initialPosition.x,
480								item.initialPosition.y,
481								item.initialZoomLevel,
482								item);
483		}
484	},
485	_setTranslateX = function(x, elStyle) {
486		elStyle[_transformKey] = _translatePrefix + x + 'px, 0px' + _translateSufix;
487	},
488	_moveMainScroll = function(x, dragging) {
489
490		if(!_options.loop && dragging) {
491			var newSlideIndexOffset = _currentItemIndex + (_slideSize.x * _currPositionIndex - x) / _slideSize.x,
492				delta = Math.round(x - _mainScrollPos.x);
493
494			if( (newSlideIndexOffset < 0 && delta > 0) ||
495				(newSlideIndexOffset >= _getNumItems() - 1 && delta < 0) ) {
496				x = _mainScrollPos.x + delta * _options.mainScrollEndFriction;
497			}
498		}
499
500		_mainScrollPos.x = x;
501		_setTranslateX(x, _containerStyle);
502	},
503	_calculatePanOffset = function(axis, zoomLevel) {
504		var m = _midZoomPoint[axis] - _offset[axis];
505		return _startPanOffset[axis] + _currPanDist[axis] + m - m * ( zoomLevel / _startZoomLevel );
506	},
507
508	_equalizePoints = function(p1, p2) {
509		p1.x = p2.x;
510		p1.y = p2.y;
511		if(p2.id) {
512			p1.id = p2.id;
513		}
514	},
515	_roundPoint = function(p) {
516		p.x = Math.round(p.x);
517		p.y = Math.round(p.y);
518	},
519
520	_mouseMoveTimeout = null,
521	_onFirstMouseMove = function() {
522		// Wait until mouse move event is fired at least twice during 100ms
523		// We do this, because some mobile browsers trigger it on touchstart
524		if(_mouseMoveTimeout ) {
525			framework.unbind(document, 'mousemove', _onFirstMouseMove);
526			framework.addClass(template, 'pswp--has_mouse');
527			_options.mouseUsed = true;
528			_shout('mouseUsed');
529		}
530		_mouseMoveTimeout = setTimeout(function() {
531			_mouseMoveTimeout = null;
532		}, 100);
533	},
534
535	_bindEvents = function() {
536		framework.bind(document, 'keydown', self);
537
538		if(_features.transform) {
539			// don't bind click event in browsers that don't support transform (mostly IE8)
540			framework.bind(self.scrollWrap, 'click', self);
541		}
542
543
544		if(!_options.mouseUsed) {
545			framework.bind(document, 'mousemove', _onFirstMouseMove);
546		}
547
548		framework.bind(window, 'resize scroll', self);
549
550		_shout('bindEvents');
551	},
552
553	_unbindEvents = function() {
554		framework.unbind(window, 'resize', self);
555		framework.unbind(window, 'scroll', _globalEventHandlers.scroll);
556		framework.unbind(document, 'keydown', self);
557		framework.unbind(document, 'mousemove', _onFirstMouseMove);
558
559		if(_features.transform) {
560			framework.unbind(self.scrollWrap, 'click', self);
561		}
562
563		if(_isDragging) {
564			framework.unbind(window, _upMoveEvents, self);
565		}
566
567		_shout('unbindEvents');
568	},
569
570	_calculatePanBounds = function(zoomLevel, update) {
571		var bounds = _calculateItemSize( self.currItem, _viewportSize, zoomLevel );
572		if(update) {
573			_currPanBounds = bounds;
574		}
575		return bounds;
576	},
577
578	_getMinZoomLevel = function(item) {
579		if(!item) {
580			item = self.currItem;
581		}
582		return item.initialZoomLevel;
583	},
584	_getMaxZoomLevel = function(item) {
585		if(!item) {
586			item = self.currItem;
587		}
588		return item.w > 0 ? _options.maxSpreadZoom : 1;
589	},
590
591	// Return true if offset is out of the bounds
592	_modifyDestPanOffset = function(axis, destPanBounds, destPanOffset, destZoomLevel) {
593		if(destZoomLevel === self.currItem.initialZoomLevel) {
594			destPanOffset[axis] = self.currItem.initialPosition[axis];
595			return true;
596		} else {
597			destPanOffset[axis] = _calculatePanOffset(axis, destZoomLevel);
598
599			if(destPanOffset[axis] > destPanBounds.min[axis]) {
600				destPanOffset[axis] = destPanBounds.min[axis];
601				return true;
602			} else if(destPanOffset[axis] < destPanBounds.max[axis] ) {
603				destPanOffset[axis] = destPanBounds.max[axis];
604				return true;
605			}
606		}
607		return false;

608	},
609
610	_setupTransforms = function() {
611
612		if(_transformKey) {
613			// setup 3d transforms
614			var allow3dTransform = _features.perspective && !_likelyTouchDevice;
615			_translatePrefix = 'translate' + (allow3dTransform ? '3d(' : '(');
616			_translateSufix = _features.perspective ? ', 0px)' : ')';
617			return;
618		}
619
620		// Override zoom/pan/move functions in case old browser is used (most likely IE)
621		// (so they use left/top/width/height, instead of CSS transform)
622
623		_transformKey = 'left';
624		framework.addClass(template, 'pswp--ie');
625
626		_setTranslateX = function(x, elStyle) {
627			elStyle.left = x + 'px';
628		};
629		_applyZoomPanToItem = function(item) {
630
631			var zoomRatio = item.fitRatio > 1 ? 1 : item.fitRatio,
632				s = item.container.style,
633				w = zoomRatio * item.w,
634				h = zoomRatio * item.h;
635
636			s.width = w + 'px';
637			s.height = h + 'px';
638			s.left = item.initialPosition.x + 'px';
639			s.top = item.initialPosition.y + 'px';
640
641		};
642		_applyCurrentZoomPan = function() {
643			if(_currZoomElementStyle) {
644
645				var s = _currZoomElementStyle,
646					item = self.currItem,
647					zoomRatio = item.fitRatio > 1 ? 1 : item.fitRatio,
648					w = zoomRatio * item.w,
649					h = zoomRatio * item.h;
650
651				s.width = w + 'px';
652				s.height = h + 'px';
653
654
655				s.left = _panOffset.x + 'px';
656				s.top = _panOffset.y + 'px';
657			}
658
659		};
660	},
661
662	_onKeyDown = function(e) {
663		var keydownAction = '';
664		if(_options.escKey && e.keyCode === 27) {
665			keydownAction = 'close';
666		} else if(_options.arrowKeys) {
667			if(e.keyCode === 37) {
668				keydownAction = 'prev';
669			} else if(e.keyCode === 39) {
670				keydownAction = 'next';
671			}
672		}
673
674		if(keydownAction) {
675			// don't do anything if special key pressed to prevent from overriding default browser actions
676			// e.g. in Chrome on Mac cmd+arrow-left returns to previous page
677			if( !e.ctrlKey && !e.altKey && !e.shiftKey && !e.metaKey ) {
678				if(e.preventDefault) {
679					e.preventDefault();
680				} else {
681					e.returnValue = false;
682				}
683				self[keydownAction]();
684			}
685		}
686	},
687
688	_onGlobalClick = function(e) {
689		if(!e) {
690			return;
691		}
692
693		// don't allow click event to pass through when triggering after drag or some other gesture
694		if(_moved || _zoomStarted || _mainScrollAnimating || _verticalDragInitiated) {
695			e.preventDefault();
696			e.stopPropagation();
697		}
698	},
699
700	_updatePageScrollOffset = function() {
701		self.setScrollOffset(0, framework.getScrollY());
702	};
703
704
705
706
707
708
709
710// Micro animation engine
711var _animations = {},
712	_numAnimations = 0,
713	_stopAnimation = function(name) {
714		if(_animations[name]) {
715			if(_animations[name].raf) {
716				_cancelAF( _animations[name].raf );
717			}
718			_numAnimations--;
719			delete _animations[name];
720		}
721	},
722	_registerStartAnimation = function(name) {
723		if(_animations[name]) {
724			_stopAnimation(name);
725		}
726		if(!_animations[name]) {
727			_numAnimations++;
728			_animations[name] = {};
729		}
730	},
731	_stopAllAnimations = function() {
732		for (var prop in _animations) {
733
734			if( _animations.hasOwnProperty( prop ) ) {
735				_stopAnimation(prop);
736			}
737
738		}
739	},
740	_animateProp = function(name, b, endProp, d, easingFn, onUpdate, onComplete) {
741		var startAnimTime = _getCurrentTime(), t;
742		_registerStartAnimation(name);
743
744		var animloop = function(){
745			if ( _animations[name] ) {
746
747				t = _getCurrentTime() - startAnimTime; // time diff
748				//b - beginning (start prop)
749				//d - anim duration
750
751				if ( t >= d ) {
752					_stopAnimation(name);
753					onUpdate(endProp);
754					if(onComplete) {
755						onComplete();
756					}
757					return;
758				}
759				onUpdate( (endProp - b) * easingFn(t/d) + b );
760
761				_animations[name].raf = _requestAF(animloop);
762			}
763		};
764		animloop();
765	};
766
767
768
769var publicMethods = {
770
771	// make a few local variables and functions public
772	shout: _shout,
773	listen: _listen,
774	viewportSize: _viewportSize,
775	options: _options,
776
777	isMainScrollAnimating: function() {
778		return _mainScrollAnimating;
779	},
780	getZoomLevel: function() {
781		return _currZoomLevel;
782	},
783	getCurrentIndex: function() {
784		return _currentItemIndex;
785	},
786	isDragging: function() {
787		return _isDragging;
788	},
789	isZooming: function() {
790		return _isZooming;
791	},
792	setScrollOffset: function(x,y) {
793		_offset.x = x;
794		_currentWindowScrollY = _offset.y = y;
795		_shout('updateScrollOffset', _offset);
796	},
797	applyZoomPan: function(zoomLevel,panX,panY,allowRenderResolution) {
798		_panOffset.x = panX;

799		_panOffset.y = panY;
800		_currZoomLevel = zoomLevel;
801		_applyCurrentZoomPan( allowRenderResolution );
802	},
803
804	init: function() {
805
806		if(_isOpen || _isDestroying) {
807			return;
808		}
809
810		var i;
811
812		self.framework = framework; // basic functionality
813		self.template = template; // root DOM element of PhotoSwipe
814		self.bg = framework.getChildByClass(template, 'pswp__bg');
815
816		_initalClassName = template.className;
817		_isOpen = true;
818
819		_features = framework.detectFeatures();
820		_requestAF = _features.raf;
821		_cancelAF = _features.caf;
822		_transformKey = _features.transform;
823		_oldIE = _features.oldIE;
824
825		self.scrollWrap = framework.getChildByClass(template, 'pswp__scroll-wrap');
826		self.container = framework.getChildByClass(self.scrollWrap, 'pswp__container');
827
828		_containerStyle = self.container.style; // for fast access
829
830		// Objects that hold slides (there are only 3 in DOM)
831		self.itemHolders = _itemHolders = [
832			{el:self.container.children[0] , wrap:0, index: -1},
833			{el:self.container.children[1] , wrap:0, index: -1},
834			{el:self.container.children[2] , wrap:0, index: -1}
835		];
836
837		// hide nearby item holders until initial zoom animation finishes (to avoid extra Paints)
838		_itemHolders[0].el.style.display = _itemHolders[2].el.style.display = 'none';
839
840		_setupTransforms();
841
842		// Setup global events
843		_globalEventHandlers = {
844			resize: self.updateSize,
845			scroll: _updatePageScrollOffset,
846			keydown: _onKeyDown,
847			click: _onGlobalClick
848		};
849
850		// disable show/hide effects on old browsers that don't support CSS animations or transforms,
851		// old IOS, Android and Opera mobile. Blackberry seems to work fine, even older models.
852		var oldPhone = _features.isOldIOSPhone || _features.isOldAndroid || _features.isMobileOpera;
853		if(!_features.animationName || !_features.transform || oldPhone) {
854			_options.showAnimationDuration = _options.hideAnimationDuration = 0;
855		}
856
857		// init modules
858		for(i = 0; i < _modules.length; i++) {
859			self['init' + _modules[i]]();
860		}
861
862		// init
863		if(UiClass) {
864			var ui = self.ui = new UiClass(self, framework);
865			ui.init();
866		}
867
868		_shout('firstUpdate');
869		_currentItemIndex = _currentItemIndex || _options.index || 0;
870		// validate index
871		if( isNaN(_currentItemIndex) || _currentItemIndex < 0 || _currentItemIndex >= _getNumItems() ) {
872			_currentItemIndex = 0;
873		}
874		self.currItem = _getItemAt( _currentItemIndex );
875
876
877		if(_features.isOldIOSPhone || _features.isOldAndroid) {
878			_isFixedPosition = false;
879		}
880
881		template.setAttribute('aria-hidden', 'false');
882		if(_options.modal) {
883			if(!_isFixedPosition) {
884				template.style.position = 'absolute';
885				template.style.top = framework.getScrollY() + 'px';
886			} else {
887				template.style.position = 'fixed';
888			}
889		}
890
891		if(_currentWindowScrollY === undefined) {
892			_shout('initialLayout');
893			_currentWindowScrollY = _initalWindowScrollY = framework.getScrollY();
894		}
895
896		// add classes to root element of PhotoSwipe
897		var rootClasses = 'pswp--open ';
898		if(_options.mainClass) {
899			rootClasses += _options.mainClass + ' ';
900		}
901		if(_options.showHideOpacity) {
902			rootClasses += 'pswp--animate_opacity ';
903		}
904		rootClasses += _likelyTouchDevice ? 'pswp--touch' : 'pswp--notouch';
905		rootClasses += _features.animationName ? ' pswp--css_animation' : '';
906		rootClasses += _features.svg ? ' pswp--svg' : '';
907		framework.addClass(template, rootClasses);
908
909		self.updateSize();
910
911		// initial update
912		_containerShiftIndex = -1;
913		_indexDiff = null;
914		for(i = 0; i < NUM_HOLDERS; i++) {
915			_setTranslateX( (i+_containerShiftIndex) * _slideSize.x, _itemHolders[i].el.style);
916		}
917
918		if(!_oldIE) {
919			framework.bind(self.scrollWrap, _downEvents, self); // no dragging for old IE
920		}
921
922		_listen('initialZoomInEnd', function() {
923			self.setContent(_itemHolders[0], _currentItemIndex-1);
924			self.setContent(_itemHolders[2], _currentItemIndex+1);
925
926			_itemHolders[0].el.style.display = _itemHolders[2].el.style.display = 'block';
927
928			if(_options.focus) {
929				// focus causes layout,
930				// which causes lag during the animation,
931				// that's why we delay it untill the initial zoom transition ends
932				template.focus();
933			}
934
935
936			_bindEvents();
937		});
938
939		// set content for center slide (first time)
940		self.setContent(_itemHolders[1], _currentItemIndex);
941
942		self.updateCurrItem();
943
944		_shout('afterInit');
945
946		if(!_isFixedPosition) {
947
948			// On all versions of iOS lower than 8.0, we check size of viewport every second.
949			//
950			// This is done to detect when Safari top & bottom bars appear,
951			// as this action doesn't trigger any events (like resize).
952			//
953			// On iOS8 they fixed this.
954			//
955			// 10 Nov 2014: iOS 7 usage ~40%. iOS 8 usage 56%.
956
957			_updateSizeInterval = setInterval(function() {
958				if(!_numAnimations && !_isDragging && !_isZooming && (_currZoomLevel === self.currItem.initialZoomLevel)  ) {
959					self.updateSize();
960				}
961			}, 1000);
962		}
963

964		framework.addClass(template, 'pswp--visible');
965	},
966
967	// Close the gallery, then destroy it
968	close: function() {
969		if(!_isOpen) {
970			return;
971		}
972
973		_isOpen = false;
974		_isDestroying = true;
975		_shout('close');
976		_unbindEvents();
977
978		_showOrHide(self.currItem, null, true, self.destroy);
979	},
980
981	// destroys the gallery (unbinds events, cleans up intervals and timeouts to avoid memory leaks)
982	destroy: function() {
983		_shout('destroy');
984
985		if(_showOrHideTimeout) {
986			clearTimeout(_showOrHideTimeout);
987		}
988
989		template.setAttribute('aria-hidden', 'true');
990		template.className = _initalClassName;
991
992		if(_updateSizeInterval) {
993			clearInterval(_updateSizeInterval);
994		}
995
996		framework.unbind(self.scrollWrap, _downEvents, self);
997
998		// we unbind scroll event at the end, as closing animation may depend on it
999		framework.unbind(window, 'scroll', self);
1000
1001		_stopDragUpdateLoop();
1002
1003		_stopAllAnimations();
1004
1005		_listeners = null;
1006	},
1007
1008	/**
1009	 * Pan image to position
1010	 * @param {Number} x
1011	 * @param {Number} y
1012	 * @param {Boolean} force Will ignore bounds if set to true.
1013	 */
1014	panTo: function(x,y,force) {
1015		if(!force) {
1016			if(x > _currPanBounds.min.x) {
1017				x = _currPanBounds.min.x;
1018			} else if(x < _currPanBounds.max.x) {
1019				x = _currPanBounds.max.x;
1020			}
1021
1022			if(y > _currPanBounds.min.y) {
1023				y = _currPanBounds.min.y;
1024			} else if(y < _currPanBounds.max.y) {
1025				y = _currPanBounds.max.y;
1026			}
1027		}
1028
1029		_panOffset.x = x;
1030		_panOffset.y = y;
1031		_applyCurrentZoomPan();
1032	},
1033
1034	handleEvent: function (e) {
1035		e = e || window.event;
1036		if(_globalEventHandlers[e.type]) {
1037			_globalEventHandlers[e.type](e);
1038		}
1039	},
1040
1041
1042	goTo: function(index) {
1043
1044		index = _getLoopedId(index);
1045
1046		var diff = index - _currentItemIndex;
1047		_indexDiff = diff;
1048
1049		_currentItemIndex = index;
1050		self.currItem = _getItemAt( _currentItemIndex );
1051		_currPositionIndex -= diff;
1052
1053		_moveMainScroll(_slideSize.x * _currPositionIndex);
1054
1055
1056		_stopAllAnimations();
1057		_mainScrollAnimating = false;
1058
1059		self.updateCurrItem();
1060	},
1061	next: function() {
1062		self.goTo( _currentItemIndex + 1);
1063	},
1064	prev: function() {
1065		self.goTo( _currentItemIndex - 1);
1066	},
1067
1068	// update current zoom/pan objects
1069	updateCurrZoomItem: function(emulateSetContent) {
1070		if(emulateSetContent) {
1071			_shout('beforeChange', 0);
1072		}
1073
1074		// itemHolder[1] is middle (current) item
1075		if(_itemHolders[1].el.children.length) {
1076			var zoomElement = _itemHolders[1].el.children[0];
1077			if( framework.hasClass(zoomElement, 'pswp__zoom-wrap') ) {
1078				_currZoomElementStyle = zoomElement.style;
1079			} else {
1080				_currZoomElementStyle = null;
1081			}
1082		} else {
1083			_currZoomElementStyle = null;
1084		}
1085
1086		_currPanBounds = self.currItem.bounds;
1087		_startZoomLevel = _currZoomLevel = self.currItem.initialZoomLevel;
1088
1089		_panOffset.x = _currPanBounds.center.x;
1090		_panOffset.y = _currPanBounds.center.y;
1091
1092		if(emulateSetContent) {
1093			_shout('afterChange');
1094		}
1095	},
1096
1097
1098	invalidateCurrItems: function() {
1099		_itemsNeedUpdate = true;
1100		for(var i = 0; i < NUM_HOLDERS; i++) {
1101			if( _itemHolders[i].item ) {
1102				_itemHolders[i].item.needsUpdate = true;
1103			}
1104		}
1105	},
1106
1107	updateCurrItem: function(beforeAnimation) {
1108
1109		if(_indexDiff === 0) {
1110			return;
1111		}
1112
1113		var diffAbs = Math.abs(_indexDiff),
1114			tempHolder;
1115
1116		if(beforeAnimation && diffAbs < 2) {
1117			return;
1118		}
1119
1120
1121		self.currItem = _getItemAt( _currentItemIndex );
1122		_renderMaxResolution = false;
1123
1124		_shout('beforeChange', _indexDiff);
1125
1126		if(diffAbs >= NUM_HOLDERS) {
1127			_containerShiftIndex += _indexDiff + (_indexDiff > 0 ? -NUM_HOLDERS : NUM_HOLDERS);
1128			diffAbs = NUM_HOLDERS;
1129		}
1130		for(var i = 0; i < diffAbs; i++) {
1131			if(_indexDiff > 0) {
1132				tempHolder = _itemHolders.shift();
1133				_itemHolders[NUM_HOLDERS-1] = tempHolder; // move first to last
1134
1135				_containerShiftIndex++;
1136				_setTranslateX( (_containerShiftIndex+2) * _slideSize.x, tempHolder.el.style);
1137				self.setContent(tempHolder, _currentItemIndex - diffAbs + i + 1 + 1);
1138			} else {
1139				tempHolder = _itemHolders.pop();
1140				_itemHolders.unshift( tempHolder ); // move last to first
1141
1142				_containerShiftIndex--;
1143				_setTranslateX( _containerShiftIndex * _slideSize.x, tempHolder.el.style);
1144				self.setContent(tempHolder, _currentItemIndex + diffAbs - i - 1 - 1);
1145			}
1146
1147		}
1148
1149		// reset zoom/pan on previous item
1150		if(_currZoomElementStyle && Math.abs(_indexDiff) === 1) {
1151
1152			var prevItem = _getItemAt(_prevItemIndex);
1153			if(prevItem.initialZoomLevel !== _currZoomLevel) {
1154				_calculateItemSize(prevItem , _viewportSize );
1155				_setImageSize(prevItem);
1156				_applyZoomPanToItem( prevItem );
1157			}
1158
1159		}
1160
1161		// reset diff after update
1162		_indexDiff = 0;
1163
1164		self.updateCurrZoomItem();
1165
1166		_prevItemIndex = _currentItemIndex;
1167
1168		_shout('afterChange');
1169
1170	},
1171
1172
1173
1174	updateSize: function(force) {
1175
1176		if(!_isFixedPosition && _options.modal) {
1177			var windowScrollY = framework.getScrollY();
1178			if(_currentWindowScrollY !== windowScrollY) {
1179				template.style.top = windowScrollY + 'px';
1180				_currentWindowScrollY = windowScrollY;
1181			}
1182			if(!force && _windowVisibleSize.x === window.innerWidth && _windowVisibleSize.y === window.innerHeight) {
1183				return;
1184			}
1185			_windowVisibleSize.x = window.innerWidth;
1186			_windowVisibleSize.y = window.innerHeight;
1187
1188			//template.style.width = _windowVisibleSize.x + 'px';
1189			template.style.height = _windowVisibleSize.y + 'px';
1190		}
1191
1192
1193
1194		_viewportSize.x = self.scrollWrap.clientWidth;
1195		_viewportSize.y = self.scrollWrap.clientHeight;
1196
1197		_updatePageScrollOffset();
1198
1199		_slideSize.x = _viewportSize.x + Math.round(_viewportSize.x * _options.spacing);
1200		_slideSize.y = _viewportSize.y;
1201
1202		_moveMainScroll(_slideSize.x * _currPositionIndex);
1203
1204		_shout('beforeResize'); // even may be used for example to switch image sources
1205
1206
1207		// don't re-calculate size on inital size update
1208		if(_containerShiftIndex !== undefined) {
1209
1210			var holder,
1211				item,
1212				hIndex;
1213
1214			for(var i = 0; i < NUM_HOLDERS; i++) {
1215				holder = _itemHolders[i];
1216				_setTranslateX( (i+_containerShiftIndex) * _slideSize.x, holder.el.style);
1217
1218				hIndex = _currentItemIndex+i-1;
1219
1220				if(_options.loop && _getNumItems() > 2) {
1221					hIndex = _getLoopedId(hIndex);
1222				}
1223
1224				// update zoom level on items and refresh source (if needsUpdate)
1225				item = _getItemAt( hIndex );
1226
1227				// re-render gallery item if `needsUpdate`,
1228				// or doesn't have `bounds` (entirely new slide object)
1229				if( item && (_itemsNeedUpdate || item.needsUpdate || !item.bounds) ) {
1230
1231					self.cleanSlide( item );
1232
1233					self.setContent( holder, hIndex );
1234
1235					// if "center" slide
1236					if(i === 1) {
1237						self.currItem = item;
1238						self.updateCurrZoomItem(true);
1239					}
1240
1241					item.needsUpdate = false;

1242
1243				} else if(holder.index === -1 && hIndex >= 0) {
1244					// add content first time
1245					self.setContent( holder, hIndex );
1246				}
1247				if(item && item.container) {
1248					_calculateItemSize(item, _viewportSize);
1249					_setImageSize(item);
1250					_applyZoomPanToItem( item );
1251				}
1252
1253			}
1254			_itemsNeedUpdate = false;
1255		}
1256
1257		_startZoomLevel = _currZoomLevel = self.currItem.initialZoomLevel;
1258		_currPanBounds = self.currItem.bounds;
1259
1260		if(_currPanBounds) {
1261			_panOffset.x = _currPanBounds.center.x;
1262			_panOffset.y = _currPanBounds.center.y;
1263			_applyCurrentZoomPan( true );
1264		}
1265
1266		_shout('resize');
1267	},
1268
1269	// Zoom current item to
1270	zoomTo: function(destZoomLevel, centerPoint, speed, easingFn, updateFn) {
1271		/*
1272			if(destZoomLevel === 'fit') {
1273				destZoomLevel = self.currItem.fitRatio;
1274			} else if(destZoomLevel === 'fill') {
1275				destZoomLevel = self.currItem.fillRatio;
1276			}
1277		*/
1278
1279		if(centerPoint) {
1280			_startZoomLevel = _currZoomLevel;
1281			_midZoomPoint.x = Math.abs(centerPoint.x) - _panOffset.x ;
1282			_midZoomPoint.y = Math.abs(centerPoint.y) - _panOffset.y ;
1283			_equalizePoints(_startPanOffset, _panOffset);
1284		}
1285
1286		var destPanBounds = _calculatePanBounds(destZoomLevel, false),
1287			destPanOffset = {};
1288
1289		_modifyDestPanOffset('x', destPanBounds, destPanOffset, destZoomLevel);
1290		_modifyDestPanOffset('y', destPanBounds, destPanOffset, destZoomLevel);
1291
1292		var initialZoomLevel = _currZoomLevel;
1293		var initialPanOffset = {
1294			x: _panOffset.x,
1295			y: _panOffset.y
1296		};
1297
1298		_roundPoint(destPanOffset);
1299
1300		var onUpdate = function(now) {
1301			if(now === 1) {
1302				_currZoomLevel = destZoomLevel;
1303				_panOffset.x = destPanOffset.x;
1304				_panOffset.y = destPanOffset.y;
1305			} else {
1306				_currZoomLevel = (destZoomLevel - initialZoomLevel) * now + initialZoomLevel;
1307				_panOffset.x = (destPanOffset.x - initialPanOffset.x) * now + initialPanOffset.x;

1308				_panOffset.y = (destPanOffset.y - initialPanOffset.y) * now + initialPanOffset.y;
1309			}
1310
1311			if(updateFn) {
1312				updateFn(now);
1313			}
1314
1315			_applyCurrentZoomPan( now === 1 );
1316		};
1317
1318		if(speed) {
1319			_animateProp('customZoomTo', 0, 1, speed, easingFn || framework.easing.sine.inOut, onUpdate);
1320		} else {
1321			onUpdate(1);
1322		}
1323	}
1324
1325
1326};
1327
1328
1329/*>>core*/
1330
1331/*>>gestures*/
1332/**
1333 * Mouse/touch/pointer event handlers.
1334 *
1335 * separated from @core.js for readability
1336 */
1337
1338var MIN_SWIPE_DISTANCE = 30,
1339	DIRECTION_CHECK_OFFSET = 10; // amount of pixels to drag to determine direction of swipe
1340
1341var _gestureStartTime,
1342	_gestureCheckSpeedTime,
1343
1344	// pool of objects that are used during dragging of zooming
1345	p = {}, // first point
1346	p2 = {}, // second point (for zoom gesture)
1347	delta = {},
1348	_currPoint = {},
1349	_startPoint = {},
1350	_currPointers = [],
1351	_startMainScrollPos = {},
1352	_releaseAnimData,
1353	_posPoints = [], // array of points during dragging, used to determine type of gesture
1354	_tempPoint = {},
1355
1356	_isZoomingIn,
1357	_verticalDragInitiated,
1358	_oldAndroidTouchEndTimeout,
1359	_currZoomedItemIndex = 0,
1360	_centerPoint = _getEmptyPoint(),
1361	_lastReleaseTime = 0,
1362	_isDragging, // at least one pointer is down
1363	_isMultitouch, // at least two _pointers are down
1364	_zoomStarted, // zoom level changed during zoom gesture
1365	_moved,
1366	_dragAnimFrame,
1367	_mainScrollShifted,
1368	_currentPoints, // array of current touch points
1369	_isZooming,
1370	_currPointsDistance,
1371	_startPointsDistance,
1372	_currPanBounds,
1373	_mainScrollPos = _getEmptyPoint(),
1374	_currZoomElementStyle,
1375	_mainScrollAnimating, // true, if animation after swipe gesture is running
1376	_midZoomPoint = _getEmptyPoint(),
1377	_currCenterPoint = _getEmptyPoint(),
1378	_direction,
1379	_isFirstMove,
1380	_opacityChanged,
1381	_bgOpacity,
1382	_wasOverInitialZoom,
1383
1384	_isEqualPoints = function(p1, p2) {
1385		return p1.x === p2.x && p1.y === p2.y;
1386	},
1387	_isNearbyPoints = function(touch0, touch1) {
1388		return Math.abs(touch0.x - touch1.x) < DOUBLE_TAP_RADIUS && Math.abs(touch0.y - touch1.y) < DOUBLE_TAP_RADIUS;
1389	},
1390	_calculatePointsDistance = function(p1, p2) {
1391		_tempPoint.x = Math.abs( p1.x - p2.x );
1392		_tempPoint.y = Math.abs( p1.y - p2.y );
1393		return Math.sqrt(_tempPoint.x * _tempPoint.x + _tempPoint.y * _tempPoint.y);
1394	},
1395	_stopDragUpdateLoop = function() {
1396		if(_dragAnimFrame) {
1397			_cancelAF(_dragAnimFrame);
1398			_dragAnimFrame = null;
1399		}
1400	},
1401	_dragUpdateLoop = function() {
1402		if(_isDragging) {
1403			_dragAnimFrame = _requestAF(_dragUpdateLoop);
1404			_renderMovement();
1405		}
1406	},
1407	_canPan = function() {
1408		return !(_options.scaleMode === 'fit' && _currZoomLevel ===  self.currItem.initialZoomLevel);
1409	},
1410
1411	// find the closest parent DOM element
1412	_closestElement = function(el, fn) {
1413	  	if(!el) {
1414	  		return false;
1415	  	}
1416
1417	  	// don't search elements above pswp__scroll-wrap
1418	  	if(el.className && el.className.indexOf('pswp__scroll-wrap') > -1 ) {
1419	  		return false;
1420	  	}
1421
1422	  	if( fn(el) ) {
1423	  		return el;
1424	  	}
1425
1426	  	return _closestElement(el.parentNode, fn);
1427	},
1428
1429	_preventObj = {},
1430	_preventDefaultEventBehaviour = function(e, isDown) {
1431	    _preventObj.prevent = !_closestElement(e.target, _options.isClickableElement);
1432
1433		_shout('preventDragEvent', e, isDown, _preventObj);
1434		return _preventObj.prevent;
1435
1436	},
1437	_convertTouchToPoint = function(touch, p) {
1438		p.x = touch.pageX;
1439		p.y = touch.pageY;
1440		p.id = touch.identifier;
1441		return p;
1442	},
1443	_findCenterOfPoints = function(p1, p2, pCenter) {
1444		pCenter.x = (p1.x + p2.x) * 0.5;
1445		pCenter.y = (p1.y + p2.y) * 0.5;
1446	},
1447	_pushPosPoint = function(time, x, y) {
1448		if(time - _gestureCheckSpeedTime > 50) {
1449			var o = _posPoints.length > 2 ? _posPoints.shift() : {};
1450			o.x = x;
1451			o.y = y;
1452			_posPoints.push(o);
1453			_gestureCheckSpeedTime = time;
1454		}
1455	},
1456
1457	_calculateVerticalDragOpacityRatio = function() {
1458		var yOffset = _panOffset.y - self.currItem.initialPosition.y; // difference between initial and current position
1459		return 1 -  Math.abs( yOffset / (_viewportSize.y / 2)  );
1460	},
1461
1462
1463	// points pool, reused during touch events
1464	_ePoint1 = {},
1465	_ePoint2 = {},
1466	_tempPointsArr = [],
1467	_tempCounter,
1468	_getTouchPoints = function(e) {
1469		// clean up previous points, without recreating array
1470		while(_tempPointsArr.length > 0) {
1471			_tempPointsArr.pop();
1472		}
1473
1474		if(!_pointerEventEnabled) {
1475			if(e.type.indexOf('touch') > -1) {
1476
1477				if(e.touches && e.touches.length > 0) {
1478					_tempPointsArr[0] = _convertTouchToPoint(e.touches[0], _ePoint1);
1479					if(e.touches.length > 1) {
1480						_tempPointsArr[1] = _convertTouchToPoint(e.touches[1], _ePoint2);
1481					}
1482				}
1483
1484			} else {
1485				_ePoint1.x = e.pageX;
1486				_ePoint1.y = e.pageY;
1487				_ePoint1.id = '';
1488				_tempPointsArr[0] = _ePoint1;//_ePoint1;
1489			}
1490		} else {
1491			_tempCounter = 0;
1492			// we can use forEach, as pointer events are supported only in modern browsers

1493			_currPointers.forEach(function(p) {
1494				if(_tempCounter === 0) {
1495					_tempPointsArr[0] = p;
1496				} else if(_tempCounter === 1) {
1497					_tempPointsArr[1] = p;
1498				}
1499				_tempCounter++;
1500
1501			});
1502		}
1503		return _tempPointsArr;
1504	},
1505
1506	_panOrMoveMainScroll = function(axis, delta) {
1507
1508		var panFriction,
1509			overDiff = 0,
1510			newOffset = _panOffset[axis] + delta[axis],
1511			startOverDiff,
1512			dir = delta[axis] > 0,
1513			newMainScrollPosition = _mainScrollPos.x + delta.x,
1514			mainScrollDiff = _mainScrollPos.x - _startMainScrollPos.x,
1515			newPanPos,
1516			newMainScrollPos;
1517
1518		// calculate fdistance over the bounds and friction
1519		if(newOffset > _currPanBounds.min[axis] || newOffset < _currPanBounds.max[axis]) {
1520			panFriction = _options.panEndFriction;
1521			// Linear increasing of friction, so at 1/4 of viewport it's at max value.
1522			// Looks not as nice as was expected. Left for history.
1523			// panFriction = (1 - (_panOffset[axis] + delta[axis] + panBounds.min[axis]) / (_viewportSize[axis] / 4) );
1524		} else {
1525			panFriction = 1;
1526		}
1527
1528		newOffset = _panOffset[axis] + delta[axis] * panFriction;
1529
1530		// move main scroll or start panning
1531		if(_options.allowPanToNext || _currZoomLevel === self.currItem.initialZoomLevel) {
1532
1533
1534			if(!_currZoomElementStyle) {
1535
1536				newMainScrollPos = newMainScrollPosition;
1537
1538			} else if(_direction === 'h' && axis === 'x' && !_zoomStarted ) {
1539
1540				if(dir) {
1541					if(newOffset > _currPanBounds.min[axis]) {
1542						panFriction = _options.panEndFriction;
1543						overDiff = _currPanBounds.min[axis] - newOffset;
1544						startOverDiff = _currPanBounds.min[axis] - _startPanOffset[axis];
1545					}
1546
1547					// drag right
1548					if( (startOverDiff <= 0 || mainScrollDiff < 0) && _getNumItems() > 1 ) {
1549						newMainScrollPos = newMainScrollPosition;
1550						if(mainScrollDiff < 0 && newMainScrollPosition > _startMainScrollPos.x) {
1551							newMainScrollPos = _startMainScrollPos.x;
1552						}
1553					} else {
1554						if(_currPanBounds.min.x !== _currPanBounds.max.x) {
1555							newPanPos = newOffset;
1556						}
1557
1558					}
1559
1560				} else {
1561
1562					if(newOffset < _currPanBounds.max[axis] ) {
1563						panFriction =_options.panEndFriction;
1564						overDiff = newOffset - _currPanBounds.max[axis];
1565						startOverDiff = _startPanOffset[axis] - _currPanBounds.max[axis];
1566					}
1567
1568					if( (startOverDiff <= 0 || mainScrollDiff > 0) && _getNumItems() > 1 ) {
1569						newMainScrollPos = newMainScrollPosition;
1570
1571						if(mainScrollDiff > 0 && newMainScrollPosition < _startMainScrollPos.x) {
1572							newMainScrollPos = _startMainScrollPos.x;
1573						}
1574
1575					} else {
1576						if(_currPanBounds.min.x !== _currPanBounds.max.x) {
1577							newPanPos = newOffset;
1578						}
1579					}
1580
1581				}
1582
1583
1584				//
1585			}
1586
1587			if(axis === 'x') {
1588
1589				if(newMainScrollPos !== undefined) {
1590					_moveMainScroll(newMainScrollPos, true);
1591					if(newMainScrollPos === _startMainScrollPos.x) {
1592						_mainScrollShifted = false;
1593					} else {
1594						_mainScrollShifted = true;
1595					}
1596				}
1597
1598				if(_currPanBounds.min.x !== _currPanBounds.max.x) {
1599					if(newPanPos !== undefined) {
1600						_panOffset.x = newPanPos;
1601					} else if(!_mainScrollShifted) {
1602						_panOffset.x += delta.x * panFriction;
1603					}
1604				}
1605
1606				return newMainScrollPos !== undefined;
1607			}
1608
1609		}
1610
1611		if(!_mainScrollAnimating) {
1612
1613			if(!_mainScrollShifted) {
1614				if(_currZoomLevel > self.currItem.fitRatio) {
1615					_panOffset[axis] += delta[axis] * panFriction;
1616
1617				}
1618			}
1619
1620
1621		}
1622
1623	},
1624
1625	// Pointerdown/touchstart/mousedown handler
1626	_onDragStart = function(e) {
1627
1628		// Allow dragging only via left mouse button.
1629		// As this handler is not added in IE8 - we ignore e.which
1630		//
1631		// http://www.quirksmode.org/js/events_properties.html
1632		// https://developer.mozilla.org/en-US/docs/Web/API/event.button
1633		if(e.type === 'mousedown' && e.button > 0  ) {
1634			return;
1635		}
1636
1637		if(_initialZoomRunning) {
1638			e.preventDefault();
1639			return;
1640		}
1641
1642		if(_oldAndroidTouchEndTimeout && e.type === 'mousedown') {
1643			return;
1644		}
1645
1646		if(_preventDefaultEventBehaviour(e, true)) {
1647			e.preventDefault();
1648		}
1649
1650
1651
1652		_shout('pointerDown');
1653
1654		if(_pointerEventEnabled) {
1655			var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');
1656			if(pointerIndex < 0) {
1657				pointerIndex = _currPointers.length;
1658			}
1659			_currPointers[pointerIndex] = {x:e.pageX, y:e.pageY, id: e.pointerId};
1660		}
1661
1662
1663
1664		var startPointsList = _getTouchPoints(e),
1665			numPoints = startPointsList.length;
1666
1667		_currentPoints = null;
1668
1669		_stopAllAnimations();
1670
1671		// init drag
1672		if(!_isDragging || numPoints === 1) {
1673
1674
1675
1676			_isDragging = _isFirstMove = true;
1677			framework.bind(window, _upMoveEvents, self);
1678
1679			_isZoomingIn =
1680				_wasOverInitialZoom =
1681				_opacityChanged =
1682				_verticalDragInitiated =
1683				_mainScrollShifted =
1684				_moved =
1685				_isMultitouch =
1686				_zoomStarted = false;

1687
1688			_direction = null;
1689
1690			_shout('firstTouchStart', startPointsList);
1691
1692			_equalizePoints(_startPanOffset, _panOffset);
1693
1694			_currPanDist.x = _currPanDist.y = 0;
1695			_equalizePoints(_currPoint, startPointsList[0]);
1696			_equalizePoints(_startPoint, _currPoint);
1697
1698			//_equalizePoints(_startMainScrollPos, _mainScrollPos);
1699			_startMainScrollPos.x = _slideSize.x * _currPositionIndex;
1700
1701			_posPoints = [{
1702				x: _currPoint.x,
1703				y: _currPoint.y
1704			}];
1705
1706			_gestureCheckSpeedTime = _gestureStartTime = _getCurrentTime();
1707
1708			//_mainScrollAnimationEnd(true);
1709			_calculatePanBounds( _currZoomLevel, true );
1710
1711			// Start rendering
1712			_stopDragUpdateLoop();
1713			_dragUpdateLoop();
1714
1715		}
1716
1717		// init zoom
1718		if(!_isZooming && numPoints > 1 && !_mainScrollAnimating && !_mainScrollShifted) {
1719			_startZoomLevel = _currZoomLevel;
1720			_zoomStarted = false; // true if zoom changed at least once
1721
1722			_isZooming = _isMultitouch = true;
1723			_currPanDist.y = _currPanDist.x = 0;
1724
1725			_equalizePoints(_startPanOffset, _panOffset);
1726
1727			_equalizePoints(p, startPointsList[0]);
1728			_equalizePoints(p2, startPointsList[1]);
1729
1730			_findCenterOfPoints(p, p2, _currCenterPoint);
1731
1732			_midZoomPoint.x = Math.abs(_currCenterPoint.x) - _panOffset.x;
1733			_midZoomPoint.y = Math.abs(_currCenterPoint.y) - _panOffset.y;
1734			_currPointsDistance = _startPointsDistance = _calculatePointsDistance(p, p2);
1735		}
1736
1737
1738	},
1739
1740	// Pointermove/touchmove/mousemove handler
1741	_onDragMove = function(e) {
1742
1743		e.preventDefault();
1744
1745		if(_pointerEventEnabled) {
1746			var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');
1747			if(pointerIndex > -1) {
1748				var p = _currPointers[pointerIndex];
1749				p.x = e.pageX;
1750				p.y = e.pageY;
1751			}
1752		}
1753
1754		if(_isDragging) {
1755			var touchesList = _getTouchPoints(e);
1756			if(!_direction && !_moved && !_isZooming) {
1757
1758				if(_mainScrollPos.x !== _slideSize.x * _currPositionIndex) {
1759					// if main scroll position is shifted – direction is always horizontal
1760					_direction = 'h';
1761				} else {
1762					var diff = Math.abs(touchesList[0].x - _currPoint.x) - Math.abs(touchesList[0].y - _currPoint.y);
1763					// check the direction of movement
1764					if(Math.abs(diff) >= DIRECTION_CHECK_OFFSET) {
1765						_direction = diff > 0 ? 'h' : 'v';
1766						_currentPoints = touchesList;
1767					}
1768				}
1769
1770			} else {
1771				_currentPoints = touchesList;
1772			}
1773		}
1774	},
1775	//
1776	_renderMovement =  function() {
1777
1778		if(!_currentPoints) {
1779			return;
1780		}
1781
1782		var numPoints = _currentPoints.length;
1783
1784		if(numPoints === 0) {
1785			return;
1786		}
1787
1788		_equalizePoints(p, _currentPoints[0]);
1789
1790		delta.x = p.x - _currPoint.x;
1791		delta.y = p.y - _currPoint.y;
1792
1793		if(_isZooming && numPoints > 1) {
1794			// Handle behaviour for more than 1 point
1795
1796			_currPoint.x = p.x;
1797			_currPoint.y = p.y;
1798
1799			// check if one of two points changed
1800			if( !delta.x && !delta.y && _isEqualPoints(_currentPoints[1], p2) ) {
1801				return;
1802			}
1803
1804			_equalizePoints(p2, _currentPoints[1]);
1805
1806
1807			if(!_zoomStarted) {
1808				_zoomStarted = true;
1809				_shout('zoomGestureStarted');
1810			}
1811
1812			// Distance between two points
1813			var pointsDistance = _calculatePointsDistance(p,p2);
1814
1815			var zoomLevel = _calculateZoomLevel(pointsDistance);
1816
1817			// slightly over the of initial zoom level
1818			if(zoomLevel > self.currItem.initialZoomLevel + self.currItem.initialZoomLevel / 15) {
1819				_wasOverInitialZoom = true;
1820			}
1821
1822			// Apply the friction if zoom level is out of the bounds
1823			var zoomFriction = 1,
1824				minZoomLevel = _getMinZoomLevel(),
1825				maxZoomLevel = _getMaxZoomLevel();
1826
1827			if ( zoomLevel < minZoomLevel ) {
1828
1829				if(_options.pinchToClose && !_wasOverInitialZoom && _startZoomLevel <= self.currItem.initialZoomLevel) {
1830					// fade out background if zooming out
1831					var minusDiff = minZoomLevel - zoomLevel;
1832					var percent = 1 - minusDiff / (minZoomLevel / 1.2);
1833
1834					_applyBgOpacity(percent);
1835					_shout('onPinchClose', percent);
1836					_opacityChanged = true;
1837				} else {
1838					zoomFriction = (minZoomLevel - zoomLevel) / minZoomLevel;
1839					if(zoomFriction > 1) {
1840						zoomFriction = 1;
1841					}
1842					zoomLevel = minZoomLevel - zoomFriction * (minZoomLevel / 3);
1843				}
1844
1845			} else if ( zoomLevel > maxZoomLevel ) {
1846				// 1.5 - extra zoom level above the max. E.g. if max is x6, real max 6 + 1.5 = 7.5
1847				zoomFriction = (zoomLevel - maxZoomLevel) / ( minZoomLevel * 6 );
1848				if(zoomFriction > 1) {
1849					zoomFriction = 1;
1850				}
1851				zoomLevel = maxZoomLevel + zoomFriction * minZoomLevel;
1852			}
1853
1854			if(zoomFriction < 0) {
1855				zoomFriction = 0;
1856			}
1857
1858			// distance between touch points after friction is applied
1859			_currPointsDistance = pointsDistance;
1860
1861			// _centerPoint - The point in the middle of two pointers
1862			_findCenterOfPoints(p, p2, _centerPoint);
1863
1864			// paning with two pointers pressed
1865			_currPanDist.x += _centerPoint.x - _currCenterPoint.x;
1866			_currPanDist.y += _centerPoint.y - _currCenterPoint.y;
1867			_equalizePoints(_currCenterPoint, _centerPoint);
1868
1869			_panOffset.x = _calculatePanOffset('x', zoomLevel);

1870			_panOffset.y = _calculatePanOffset('y', zoomLevel);
1871
1872			_isZoomingIn = zoomLevel > _currZoomLevel;
1873			_currZoomLevel = zoomLevel;
1874			_applyCurrentZoomPan();
1875
1876		} else {
1877
1878			// handle behaviour for one point (dragging or panning)
1879
1880			if(!_direction) {
1881				return;
1882			}
1883
1884			if(_isFirstMove) {
1885				_isFirstMove = false;
1886
1887				// subtract drag distance that was used during the detection direction
1888
1889				if( Math.abs(delta.x) >= DIRECTION_CHECK_OFFSET) {
1890					delta.x -= _currentPoints[0].x - _startPoint.x;
1891				}
1892
1893				if( Math.abs(delta.y) >= DIRECTION_CHECK_OFFSET) {
1894					delta.y -= _currentPoints[0].y - _startPoint.y;
1895				}
1896			}
1897
1898			_currPoint.x = p.x;
1899			_currPoint.y = p.y;
1900
1901			// do nothing if pointers position hasn't changed
1902			if(delta.x === 0 && delta.y === 0) {
1903				return;
1904			}
1905
1906			if(_direction === 'v' && _options.closeOnVerticalDrag) {
1907				if(!_canPan()) {
1908					_currPanDist.y += delta.y;
1909					_panOffset.y += delta.y;
1910
1911					var opacityRatio = _calculateVerticalDragOpacityRatio();
1912
1913					_verticalDragInitiated = true;
1914					_shout('onVerticalDrag', opacityRatio);
1915
1916					_applyBgOpacity(opacityRatio);
1917					_applyCurrentZoomPan();
1918					return ;
1919				}
1920			}
1921
1922			_pushPosPoint(_getCurrentTime(), p.x, p.y);
1923
1924			_moved = true;
1925			_currPanBounds = self.currItem.bounds;
1926
1927			var mainScrollChanged = _panOrMoveMainScroll('x', delta);
1928			if(!mainScrollChanged) {
1929				_panOrMoveMainScroll('y', delta);
1930
1931				_roundPoint(_panOffset);
1932				_applyCurrentZoomPan();
1933			}
1934
1935		}
1936
1937	},
1938
1939	// Pointerup/pointercancel/touchend/touchcancel/mouseup event handler
1940	_onDragRelease = function(e) {
1941
1942		if(_features.isOldAndroid ) {
1943
1944			if(_oldAndroidTouchEndTimeout && e.type === 'mouseup') {
1945				return;
1946			}
1947
1948			// on Android (v4.1, 4.2, 4.3 & possibly older)
1949			// ghost mousedown/up event isn't preventable via e.preventDefault,
1950			// which causes fake mousedown event
1951			// so we block mousedown/up for 600ms
1952			if( e.type.indexOf('touch') > -1 ) {
1953				clearTimeout(_oldAndroidTouchEndTimeout);
1954				_oldAndroidTouchEndTimeout = setTimeout(function() {
1955					_oldAndroidTouchEndTimeout = 0;
1956				}, 600);
1957			}
1958
1959		}
1960
1961		_shout('pointerUp');
1962
1963		if(_preventDefaultEventBehaviour(e, false)) {
1964			e.preventDefault();
1965		}
1966
1967		var releasePoint;
1968
1969		if(_pointerEventEnabled) {
1970			var pointerIndex = framework.arraySearch(_currPointers, e.pointerId, 'id');
1971
1972			if(pointerIndex > -1) {
1973				releasePoint = _currPointers.splice(pointerIndex, 1)[0];
1974
1975				if(navigator.pointerEnabled) {
1976					releasePoint.type = e.pointerType || 'mouse';
1977				} else {
1978					var MSPOINTER_TYPES = {
1979						4: 'mouse', // event.MSPOINTER_TYPE_MOUSE
1980						2: 'touch', // event.MSPOINTER_TYPE_TOUCH
1981						3: 'pen' // event.MSPOINTER_TYPE_PEN
1982					};
1983					releasePoint.type = MSPOINTER_TYPES[e.pointerType];
1984
1985					if(!releasePoint.type) {
1986						releasePoint.type = e.pointerType || 'mouse';
1987					}
1988				}
1989
1990			}
1991		}
1992
1993		var touchList = _getTouchPoints(e),
1994			gestureType,
1995			numPoints = touchList.length;
1996
1997		if(e.type === 'mouseup') {
1998			numPoints = 0;
1999		}
2000
2001		// Do nothing if there were 3 touch points or more
2002		if(numPoints === 2) {
2003			_currentPoints = null;
2004			return true;
2005		}
2006
2007		// if second pointer released
2008		if(numPoints === 1) {
2009			_equalizePoints(_startPoint, touchList[0]);
2010		}
2011
2012
2013		// pointer hasn't moved, send "tap release" point
2014		if(numPoints === 0 && !_direction && !_mainScrollAnimating) {
2015			if(!releasePoint) {
2016				if(e.type === 'mouseup') {
2017					releasePoint = {x: e.pageX, y: e.pageY, type:'mouse'};
2018				} else if(e.changedTouches && e.changedTouches[0]) {
2019					releasePoint = {x: e.changedTouches[0].pageX, y: e.changedTouches[0].pageY, type:'touch'};
2020				}
2021			}
2022
2023			_shout('touchRelease', e, releasePoint);
2024		}
2025
2026		// Difference in time between releasing of two last touch points (zoom gesture)
2027		var releaseTimeDiff = -1;
2028
2029		// Gesture completed, no pointers left
2030		if(numPoints === 0) {
2031			_isDragging = false;
2032			framework.unbind(window, _upMoveEvents, self);
2033
2034			_stopDragUpdateLoop();
2035
2036			if(_isZooming) {
2037				// Two points released at the same time
2038				releaseTimeDiff = 0;
2039			} else if(_lastReleaseTime !== -1) {
2040				releaseTimeDiff = _getCurrentTime() - _lastReleaseTime;
2041			}
2042		}
2043		_lastReleaseTime = numPoints === 1 ? _getCurrentTime() : -1;
2044
2045		if(releaseTimeDiff !== -1 && releaseTimeDiff < 150) {
2046			gestureType = 'zoom';
2047		} else {
2048			gestureType = 'swipe';
2049		}
2050
2051		if(_isZooming && numPoints < 2) {
2052			_isZooming = false;

2053
2054			// Only second point released
2055			if(numPoints === 1) {
2056				gestureType = 'zoomPointerUp';
2057			}
2058			_shout('zoomGestureEnded');
2059		}
2060
2061		_currentPoints = null;
2062		if(!_moved && !_zoomStarted && !_mainScrollAnimating && !_verticalDragInitiated) {
2063			// nothing to animate
2064			return;
2065		}
2066
2067		_stopAllAnimations();
2068
2069
2070		if(!_releaseAnimData) {
2071			_releaseAnimData = _initDragReleaseAnimationData();
2072		}
2073
2074		_releaseAnimData.calculateSwipeSpeed('x');
2075
2076
2077		if(_verticalDragInitiated) {
2078
2079			var opacityRatio = _calculateVerticalDragOpacityRatio();
2080
2081			if(opacityRatio < _options.verticalDragRange) {
2082				self.close();
2083			} else {
2084				var initalPanY = _panOffset.y,
2085					initialBgOpacity = _bgOpacity;
2086
2087				_animateProp('verticalDrag', 0, 1, 300, framework.easing.cubic.out, function(now) {
2088
2089					_panOffset.y = (self.currItem.initialPosition.y - initalPanY) * now + initalPanY;
2090
2091					_applyBgOpacity(  (1 - initialBgOpacity) * now + initialBgOpacity );
2092					_applyCurrentZoomPan();
2093				});
2094
2095				_shout('onVerticalDrag', 1);
2096			}
2097
2098			return;
2099		}
2100
2101
2102		// main scroll
2103		if(  (_mainScrollShifted || _mainScrollAnimating) && numPoints === 0) {
2104			var itemChanged = _finishSwipeMainScrollGesture(gestureType, _releaseAnimData);
2105			if(itemChanged) {
2106				return;
2107			}
2108			gestureType = 'zoomPointerUp';
2109		}
2110
2111		// prevent zoom/pan animation when main scroll animation runs
2112		if(_mainScrollAnimating) {
2113			return;
2114		}
2115
2116		// Complete simple zoom gesture (reset zoom level if it's out of the bounds)
2117		if(gestureType !== 'swipe') {
2118			_completeZoomGesture();
2119			return;
2120		}
2121
2122		// Complete pan gesture if main scroll is not shifted, and it's possible to pan current image
2123		if(!_mainScrollShifted && _currZoomLevel > self.currItem.fitRatio) {
2124			_completePanGesture(_releaseAnimData);
2125		}
2126	},
2127
2128
2129	// Returns object with data about gesture
2130	// It's created only once and then reused
2131	_initDragReleaseAnimationData  = function() {
2132		// temp local vars
2133		var lastFlickDuration,
2134			tempReleasePos;
2135
2136		// s = this
2137		var s = {
2138			lastFlickOffset: {},
2139			lastFlickDist: {},
2140			lastFlickSpeed: {},
2141			slowDownRatio:  {},
2142			slowDownRatioReverse:  {},
2143			speedDecelerationRatio:  {},
2144			speedDecelerationRatioAbs:  {},
2145			distanceOffset:  {},
2146			backAnimDestination: {},
2147			backAnimStarted: {},
2148			calculateSwipeSpeed: function(axis) {
2149
2150
2151				if( _posPoints.length > 1) {
2152					lastFlickDuration = _getCurrentTime() - _gestureCheckSpeedTime + 50;
2153					tempReleasePos = _posPoints[_posPoints.length-2][axis];
2154				} else {
2155					lastFlickDuration = _getCurrentTime() - _gestureStartTime; // total gesture duration
2156					tempReleasePos = _startPoint[axis];
2157				}
2158				s.lastFlickOffset[axis] = _currPoint[axis] - tempReleasePos;
2159				s.lastFlickDist[axis] = Math.abs(s.lastFlickOffset[axis]);
2160				if(s.lastFlickDist[axis] > 20) {
2161					s.lastFlickSpeed[axis] = s.lastFlickOffset[axis] / lastFlickDuration;
2162				} else {
2163					s.lastFlickSpeed[axis] = 0;
2164				}
2165				if( Math.abs(s.lastFlickSpeed[axis]) < 0.1 ) {
2166					s.lastFlickSpeed[axis] = 0;
2167				}
2168
2169				s.slowDownRatio[axis] = 0.95;
2170				s.slowDownRatioReverse[axis] = 1 - s.slowDownRatio[axis];
2171				s.speedDecelerationRatio[axis] = 1;
2172			},
2173
2174			calculateOverBoundsAnimOffset: function(axis, speed) {
2175				if(!s.backAnimStarted[axis]) {
2176
2177					if(_panOffset[axis] > _currPanBounds.min[axis]) {
2178						s.backAnimDestination[axis] = _currPanBounds.min[axis];
2179
2180					} else if(_panOffset[axis] < _currPanBounds.max[axis]) {
2181						s.backAnimDestination[axis] = _currPanBounds.max[axis];
2182					}
2183
2184					if(s.backAnimDestination[axis] !== undefined) {
2185						s.slowDownRatio[axis] = 0.7;
2186						s.slowDownRatioReverse[axis] = 1 - s.slowDownRatio[axis];
2187						if(s.speedDecelerationRatioAbs[axis] < 0.05) {
2188
2189							s.lastFlickSpeed[axis] = 0;
2190							s.backAnimStarted[axis] = true;
2191
2192							_animateProp('bounceZoomPan'+axis,_panOffset[axis],
2193								s.backAnimDestination[axis],
2194								speed || 300,
2195								framework.easing.sine.out,
2196								function(pos) {
2197									_panOffset[axis] = pos;
2198									_applyCurrentZoomPan();
2199								}
2200							);
2201
2202						}
2203					}
2204				}
2205			},
2206
2207			// Reduces the speed by slowDownRatio (per 10ms)
2208			calculateAnimOffset: function(axis) {

2209				if(!s.backAnimStarted[axis]) {
2210					s.speedDecelerationRatio[axis] = s.speedDecelerationRatio[axis] * (s.slowDownRatio[axis] +
2211												s.slowDownRatioReverse[axis] -
2212												s.slowDownRatioReverse[axis] * s.timeDiff / 10);
2213
2214					s.speedDecelerationRatioAbs[axis] = Math.abs(s.lastFlickSpeed[axis] * s.speedDecelerationRatio[axis]);
2215					s.distanceOffset[axis] = s.lastFlickSpeed[axis] * s.speedDecelerationRatio[axis] * s.timeDiff;
2216					_panOffset[axis] += s.distanceOffset[axis];
2217
2218				}
2219			},
2220
2221			panAnimLoop: function() {
2222				if ( _animations.zoomPan ) {
2223					_animations.zoomPan.raf = _requestAF(s.panAnimLoop);
2224
2225					s.now = _getCurrentTime();
2226					s.timeDiff = s.now - s.lastNow;
2227					s.lastNow = s.now;
2228
2229					s.calculateAnimOffset('x');
2230					s.calculateAnimOffset('y');
2231
2232					_applyCurrentZoomPan();
2233
2234					s.calculateOverBoundsAnimOffset('x');
2235					s.calculateOverBoundsAnimOffset('y');
2236
2237
2238					if (s.speedDecelerationRatioAbs.x < 0.05 && s.speedDecelerationRatioAbs.y < 0.05) {
2239
2240						// round pan position
2241						_panOffset.x = Math.round(_panOffset.x);
2242						_panOffset.y = Math.round(_panOffset.y);
2243						_applyCurrentZoomPan();
2244
2245						_stopAnimation('zoomPan');
2246						return;
2247					}
2248				}
2249
2250			}
2251		};
2252		return s;
2253	},
2254
2255	_completePanGesture = function(animData) {
2256		// calculate swipe speed for Y axis (paanning)
2257		animData.calculateSwipeSpeed('y');
2258
2259		_currPanBounds = self.currItem.bounds;
2260
2261		animData.backAnimDestination = {};
2262		animData.backAnimStarted = {};
2263
2264		// Avoid acceleration animation if speed is too low
2265		if(Math.abs(animData.lastFlickSpeed.x) <= 0.05 && Math.abs(animData.lastFlickSpeed.y) <= 0.05 ) {
2266			animData.speedDecelerationRatioAbs.x = animData.speedDecelerationRatioAbs.y = 0;
2267
2268			// Run pan drag release animation. E.g. if you drag image and release finger without momentum.
2269			animData.calculateOverBoundsAnimOffset('x');
2270			animData.calculateOverBoundsAnimOffset('y');
2271			return true;
2272		}
2273
2274		// Animation loop that controls the acceleration after pan gesture ends
2275		_registerStartAnimation('zoomPan');
2276		animData.lastNow = _getCurrentTime();
2277		animData.panAnimLoop();
2278	},
2279
2280
2281	_finishSwipeMainScrollGesture = function(gestureType, _releaseAnimData) {
2282		var itemChanged;
2283		if(!_mainScrollAnimating) {
2284			_currZoomedItemIndex = _currentItemIndex;
2285		}
2286
2287
2288
2289		var itemsDiff;
2290
2291		if(gestureType === 'swipe') {
2292			var totalShiftDist = _currPoint.x - _startPoint.x,
2293				isFastLastFlick = _releaseAnimData.lastFlickDist.x < 10;
2294
2295			// if container is shifted for more than MIN_SWIPE_DISTANCE,
2296			// and last flick gesture was in right direction
2297			if(totalShiftDist > MIN_SWIPE_DISTANCE &&
2298				(isFastLastFlick || _releaseAnimData.lastFlickOffset.x > 20) ) {
2299				// go to prev item
2300				itemsDiff = -1;
2301			} else if(totalShiftDist < -MIN_SWIPE_DISTANCE &&
2302				(isFastLastFlick || _releaseAnimData.lastFlickOffset.x < -20) ) {
2303				// go to next item
2304				itemsDiff = 1;
2305			}
2306		}
2307
2308		var nextCircle;
2309
2310		if(itemsDiff) {
2311
2312			_currentItemIndex += itemsDiff;
2313
2314			if(_currentItemIndex < 0) {
2315				_currentItemIndex = _options.loop ? _getNumItems()-1 : 0;
2316				nextCircle = true;
2317			} else if(_currentItemIndex >= _getNumItems()) {
2318				_currentItemIndex = _options.loop ? 0 : _getNumItems()-1;
2319				nextCircle = true;
2320			}
2321
2322			if(!nextCircle || _options.loop) {
2323				_indexDiff += itemsDiff;
2324				_currPositionIndex -= itemsDiff;
2325				itemChanged = true;
2326			}
2327
2328
2329
2330		}
2331
2332		var animateToX = _slideSize.x * _currPositionIndex;
2333		var animateToDist = Math.abs( animateToX - _mainScrollPos.x );
2334		var finishAnimDuration;
2335
2336
2337		if(!itemChanged && animateToX > _mainScrollPos.x !== _releaseAnimData.lastFlickSpeed.x > 0) {
2338			// "return to current" duration, e.g. when dragging from slide 0 to -1
2339			finishAnimDuration = 333;
2340		} else {
2341			finishAnimDuration = Math.abs(_releaseAnimData.lastFlickSpeed.x) > 0 ?
2342									animateToDist / Math.abs(_releaseAnimData.lastFlickSpeed.x) :
2343									333;
2344
2345			finishAnimDuration = Math.min(finishAnimDuration, 400);
2346			finishAnimDuration = Math.max(finishAnimDuration, 250);
2347		}
2348
2349		if(_currZoomedItemIndex === _currentItemIndex) {
2350			itemChanged = false;

2351		}
2352
2353		_mainScrollAnimating = true;
2354
2355		_shout('mainScrollAnimStart');
2356
2357		_animateProp('mainScroll', _mainScrollPos.x, animateToX, finishAnimDuration, framework.easing.cubic.out,
2358			_moveMainScroll,
2359			function() {
2360				_stopAllAnimations();
2361				_mainScrollAnimating = false;
2362				_currZoomedItemIndex = -1;
2363
2364				if(itemChanged || _currZoomedItemIndex !== _currentItemIndex) {
2365					self.updateCurrItem();
2366				}
2367
2368				_shout('mainScrollAnimComplete');
2369			}
2370		);
2371
2372		if(itemChanged) {
2373			self.updateCurrItem(true);
2374		}
2375
2376		return itemChanged;
2377	},
2378
2379	_calculateZoomLevel = function(touchesDistance) {
2380		return  1 / _startPointsDistance * touchesDistance * _startZoomLevel;
2381	},
2382
2383	// Resets zoom if it's out of bounds
2384	_completeZoomGesture = function() {
2385		var destZoomLevel = _currZoomLevel,
2386			minZoomLevel = _getMinZoomLevel(),
2387			maxZoomLevel = _getMaxZoomLevel();
2388
2389		if ( _currZoomLevel < minZoomLevel ) {
2390			destZoomLevel = minZoomLevel;
2391		} else if ( _currZoomLevel > maxZoomLevel ) {
2392			destZoomLevel = maxZoomLevel;
2393		}
2394
2395		var destOpacity = 1,
2396			onUpdate,
2397			initialOpacity = _bgOpacity;
2398
2399		if(_opacityChanged && !_isZoomingIn && !_wasOverInitialZoom && _currZoomLevel < minZoomLevel) {
2400			//_closedByScroll = true;
2401			self.close();
2402			return true;
2403		}
2404
2405		if(_opacityChanged) {
2406			onUpdate = function(now) {
2407				_applyBgOpacity(  (destOpacity - initialOpacity) * now + initialOpacity );
2408			};
2409		}
2410
2411		self.zoomTo(destZoomLevel, 0, 200,  framework.easing.cubic.out, onUpdate);
2412		return true;
2413	};
2414
2415
2416_registerModule('Gestures', {
2417	publicMethods: {
2418
2419		initGestures: function() {
2420
2421			// helper function that builds touch/pointer/mouse events
2422			var addEventNames = function(pref, down, move, up, cancel) {
2423				_dragStartEvent = pref + down;
2424				_dragMoveEvent = pref + move;
2425				_dragEndEvent = pref + up;
2426				if(cancel) {
2427					_dragCancelEvent = pref + cancel;
2428				} else {
2429					_dragCancelEvent = '';
2430				}
2431			};
2432
2433			_pointerEventEnabled = _features.pointerEvent;
2434			if(_pointerEventEnabled && _features.touch) {
2435				// we don't need touch events, if browser supports pointer events
2436				_features.touch = false;
2437			}
2438
2439			if(_pointerEventEnabled) {
2440				if(navigator.pointerEnabled) {
2441					addEventNames('pointer', 'down', 'move', 'up', 'cancel');
2442				} else {
2443					// IE10 pointer events are case-sensitive
2444					addEventNames('MSPointer', 'Down', 'Move', 'Up', 'Cancel');
2445				}
2446			} else if(_features.touch) {
2447				addEventNames('touch', 'start', 'move', 'end', 'cancel');
2448				_likelyTouchDevice = true;
2449			} else {
2450				addEventNames('mouse', 'down', 'move', 'up');
2451			}
2452
2453			_upMoveEvents = _dragMoveEvent + ' ' + _dragEndEvent  + ' ' +  _dragCancelEvent;
2454			_downEvents = _dragStartEvent;
2455
2456			if(_pointerEventEnabled && !_likelyTouchDevice) {
2457				_likelyTouchDevice = (navigator.maxTouchPoints > 1) || (navigator.msMaxTouchPoints > 1);
2458			}
2459			// make variable public
2460			self.likelyTouchDevice = _likelyTouchDevice;
2461
2462			_globalEventHandlers[_dragStartEvent] = _onDragStart;
2463			_globalEventHandlers[_dragMoveEvent] = _onDragMove;
2464			_globalEventHandlers[_dragEndEvent] = _onDragRelease; // the Kraken
2465
2466			if(_dragCancelEvent) {
2467				_globalEventHandlers[_dragCancelEvent] = _globalEventHandlers[_dragEndEvent];
2468			}
2469
2470			// Bind mouse events on device with detected hardware touch support, in case it supports multiple types of input.
2471			// if(_features.touch) { Commented this out because it causes issues with these events being bound twice. Chrome Device at iphone 6, pointer and drag release handlers are both being called
2472			// 	_downEvents += ' mousedown';
2473			// 	_upMoveEvents += ' mousemove mouseup';
2474			// 	_globalEventHandlers.mousedown = _globalEventHandlers[_dragStartEvent];
2475			// 	_globalEventHandlers.mousemove = _globalEventHandlers[_dragMoveEvent];
2476			// 	_globalEventHandlers.mouseup = _globalEventHandlers[_dragEndEvent];
2477			// }
2478
2479			if(!_likelyTouchDevice) {
2480				// don't allow pan to next slide from zoomed state on Desktop
2481				_options.allowPanToNext = false;
2482			}
2483		}
2484
2485	}
2486});
2487
2488
2489/*>>gestures*/
2490
2491/*>>show-hide-transition*/
2492/**

2493 * show-hide-transition.js:
2494 *
2495 * Manages initial opening or closing transition.
2496 *
2497 * If you're not planning to use transition for gallery at all,
2498 * you may set options hideAnimationDuration and showAnimationDuration to 0,
2499 * and just delete startAnimation function.
2500 *
2501 */
2502
2503
2504var _showOrHideTimeout,
2505	_showOrHide = function(item, img, out, completeFn) {
2506
2507		if(_showOrHideTimeout) {
2508			clearTimeout(_showOrHideTimeout);
2509		}
2510
2511		_initialZoomRunning = true;
2512		_initialContentSet = true;
2513
2514		// dimensions of small thumbnail {x:,y:,w:}.
2515		// Height is optional, as calculated based on large image.
2516		var thumbBounds;
2517		if(item.initialLayout) {
2518			thumbBounds = item.initialLayout;
2519			item.initialLayout = null;
2520		} else {
2521			thumbBounds = _options.getThumbBoundsFn && _options.getThumbBoundsFn(_currentItemIndex);
2522		}
2523
2524		var duration = out ? _options.hideAnimationDuration : _options.showAnimationDuration;
2525
2526		var onComplete = function() {
2527			_stopAnimation('initialZoom');
2528			if(!out) {
2529				_applyBgOpacity(1);
2530				if(img) {
2531					img.style.display = 'block';
2532				}
2533				framework.addClass(template, 'pswp--animated-in');
2534				_shout('initialZoom' + (out ? 'OutEnd' : 'InEnd'));
2535			} else {
2536				self.template.removeAttribute('style');
2537				self.bg.removeAttribute('style');
2538			}
2539
2540			if(completeFn) {
2541				completeFn();
2542			}
2543			_initialZoomRunning = false;
2544		};
2545
2546		// if bounds aren't provided, just open gallery without animation
2547		if(!duration || !thumbBounds || thumbBounds.x === undefined) {
2548
2549			_shout('initialZoom' + (out ? 'Out' : 'In') );
2550
2551			_currZoomLevel = item.initialZoomLevel;
2552			_equalizePoints(_panOffset,  item.initialPosition );
2553			_applyCurrentZoomPan();
2554
2555			template.style.opacity = out ? 0 : 1;
2556			_applyBgOpacity(1);
2557
2558			if(duration) {
2559				setTimeout(function() {
2560					onComplete();
2561				}, duration);
2562			} else {
2563				onComplete();
2564			}
2565
2566			return;
2567		}
2568
2569		var startAnimation = function() {
2570			var closeWithRaf = _closedByScroll,
2571				fadeEverything = !self.currItem.src || self.currItem.loadError || _options.showHideOpacity;
2572
2573			// apply hw-acceleration to image
2574			if(item.miniImg) {
2575				item.miniImg.style.webkitBackfaceVisibility = 'hidden';
2576			}
2577
2578			if(!out) {
2579				_currZoomLevel = thumbBounds.w / item.w;
2580				_panOffset.x = thumbBounds.x;
2581				_panOffset.y = thumbBounds.y - _initalWindowScrollY;
2582
2583				self[fadeEverything ? 'template' : 'bg'].style.opacity = 0.001;
2584				_applyCurrentZoomPan();
2585			}
2586
2587			_registerStartAnimation('initialZoom');
2588
2589			if(out && !closeWithRaf) {
2590				framework.removeClass(template, 'pswp--animated-in');
2591			}
2592
2593			if(fadeEverything) {
2594				if(out) {
2595					framework[ (closeWithRaf ? 'remove' : 'add') + 'Class' ](template, 'pswp--animate_opacity');
2596				} else {
2597					setTimeout(function() {
2598						framework.addClass(template, 'pswp--animate_opacity');
2599					}, 30);
2600				}
2601			}
2602
2603			_showOrHideTimeout = setTimeout(function() {
2604
2605				_shout('initialZoom' + (out ? 'Out' : 'In') );
2606
2607
2608				if(!out) {
2609
2610					// "in" animation always uses CSS transitions (instead of rAF).
2611					// CSS transition work faster here,
2612					// as developer may also want to animate other things,
2613					// like ui on top of sliding area, which can be animated just via CSS
2614
2615					_currZoomLevel = item.initialZoomLevel;
2616					_equalizePoints(_panOffset,  item.initialPosition );
2617					_applyCurrentZoomPan();
2618					_applyBgOpacity(1);
2619
2620					if(fadeEverything) {
2621						template.style.opacity = 1;
2622					} else {
2623						_applyBgOpacity(1);
2624					}
2625
2626					_showOrHideTimeout = setTimeout(onComplete, duration + 20);
2627				} else {
2628
2629					// "out" animation uses rAF only when PhotoSwipe is closed by browser scroll, to recalculate position
2630					var destZoomLevel = thumbBounds.w / item.w,
2631						initialPanOffset = {
2632							x: _panOffset.x,
2633							y: _panOffset.y
2634						},
2635						initialZoomLevel = _currZoomLevel,
2636						initalBgOpacity = _bgOpacity,
2637						onUpdate = function(now) {
2638
2639							if(now === 1) {
2640								_currZoomLevel = destZoomLevel;
2641								_panOffset.x = thumbBounds.x;
2642								_panOffset.y = thumbBounds.y  - _currentWindowScrollY;
2643							} else {
2644								_currZoomLevel = (destZoomLevel - initialZoomLevel) * now + initialZoomLevel;
2645								_panOffset.x = (thumbBounds.x - initialPanOffset.x) * now + initialPanOffset.x;

2646								_panOffset.y = (thumbBounds.y - _currentWindowScrollY - initialPanOffset.y) * now + initialPanOffset.y;
2647							}
2648
2649							_applyCurrentZoomPan();
2650							if(fadeEverything) {
2651								template.style.opacity = 1 - now;
2652							} else {
2653								_applyBgOpacity( initalBgOpacity - now * initalBgOpacity );
2654							}
2655						};
2656
2657					if(closeWithRaf) {
2658						_animateProp('initialZoom', 0, 1, duration, framework.easing.cubic.out, onUpdate, onComplete);
2659					} else {
2660						onUpdate(1);
2661						_showOrHideTimeout = setTimeout(onComplete, duration + 20);
2662					}
2663				}
2664
2665			}, out ? 25 : 90); // Main purpose of this delay is to give browser time to paint and
2666					// create composite layers of PhotoSwipe UI parts (background, controls, caption, arrows).
2667					// Which avoids lag at the beginning of scale transition.
2668		};
2669		startAnimation();
2670
2671
2672	};
2673
2674/*>>show-hide-transition*/
2675
2676/*>>items-controller*/
2677/**
2678*
2679* Controller manages gallery items, their dimensions, and their content.
2680*
2681*/
2682
2683var _items,
2684	_tempPanAreaSize = {},
2685	_imagesToAppendPool = [],
2686	_initialContentSet,
2687	_initialZoomRunning,
2688	_controllerDefaultOptions = {
2689		index: 0,
2690		errorMsg: '<div class="pswp__error-msg"><a href="%url%" target="_blank">The image</a> could not be loaded.</div>',
2691		forceProgressiveLoading: false, // TODO
2692		preload: [1,1],
2693		getNumItemsFn: function() {
2694			return _items.length;
2695		}
2696	};
2697
2698
2699var _getItemAt,
2700	_getNumItems,
2701	_initialIsLoop,
2702	_getZeroBounds = function() {
2703		return {
2704			center:{x:0,y:0},
2705			max:{x:0,y:0},
2706			min:{x:0,y:0}
2707		};
2708	},
2709	_calculateSingleItemPanBounds = function(item, realPanElementW, realPanElementH ) {
2710		var bounds = item.bounds;
2711
2712		// position of element when it's centered
2713		bounds.center.x = Math.round((_tempPanAreaSize.x - realPanElementW) / 2);
2714		bounds.center.y = Math.round((_tempPanAreaSize.y - realPanElementH) / 2) + item.vGap.top;
2715
2716		// maximum pan position
2717		bounds.max.x = (realPanElementW > _tempPanAreaSize.x) ?
2718							Math.round(_tempPanAreaSize.x - realPanElementW) :
2719							bounds.center.x;
2720
2721		bounds.max.y = (realPanElementH > _tempPanAreaSize.y) ?
2722							Math.round(_tempPanAreaSize.y - realPanElementH) + item.vGap.top :
2723							bounds.center.y;
2724
2725		// minimum pan position
2726		bounds.min.x = (realPanElementW > _tempPanAreaSize.x) ? 0 : bounds.center.x;
2727		bounds.min.y = (realPanElementH > _tempPanAreaSize.y) ? item.vGap.top : bounds.center.y;
2728	},
2729	_calculateItemSize = function(item, viewportSize, zoomLevel) {
2730
2731		if (item.src && !item.loadError) {
2732			var isInitial = !zoomLevel;
2733
2734			if(isInitial) {
2735				if(!item.vGap) {
2736					item.vGap = {top:0,bottom:0};
2737				}
2738				// allows overriding vertical margin for individual items
2739				_shout('parseVerticalMargin', item);
2740			}
2741
2742
2743			_tempPanAreaSize.x = viewportSize.x;
2744			_tempPanAreaSize.y = viewportSize.y - item.vGap.top - item.vGap.bottom;
2745
2746			if (isInitial) {
2747				var hRatio = _tempPanAreaSize.x / item.w;
2748				var vRatio = _tempPanAreaSize.y / item.h;
2749
2750				item.fitRatio = hRatio < vRatio ? hRatio : vRatio;
2751				//item.fillRatio = hRatio > vRatio ? hRatio : vRatio;
2752
2753				var scaleMode = _options.scaleMode;
2754
2755				if (scaleMode === 'orig') {
2756					zoomLevel = 1;
2757				} else if (scaleMode === 'fit') {
2758					zoomLevel = item.fitRatio;
2759				}
2760
2761				if (zoomLevel > 1) {
2762					zoomLevel = 1;
2763				}
2764
2765				item.initialZoomLevel = zoomLevel;
2766
2767				if(!item.bounds) {
2768					// reuse bounds object
2769					item.bounds = _getZeroBounds();
2770				}
2771			}
2772
2773			if(!zoomLevel) {
2774				return;
2775			}
2776
2777			_calculateSingleItemPanBounds(item, item.w * zoomLevel, item.h * zoomLevel);
2778
2779			if (isInitial && zoomLevel === item.initialZoomLevel) {
2780				item.initialPosition = item.bounds.center;
2781			}
2782
2783			return item.bounds;
2784		} else {
2785			item.w = item.h = 0;
2786			item.initialZoomLevel = item.fitRatio = 1;
2787			item.bounds = _getZeroBounds();
2788			item.initialPosition = item.bounds.center;
2789
2790			// if it's not image, we return zero bounds (content is not zoomable)
2791			return item.bounds;
2792		}
2793
2794	},
2795
2796
2797
2798
2799	_appendImage = function(index, item, baseDiv, img, preventAnimation, keepPlaceholder) {
2800
2801
2802		if(item.loadError) {
2803			return;
2804		}
2805
2806		if(img) {
2807
2808			item.imageAppended = true;
2809			_setImageSize(item, img, (item === self.currItem && _renderMaxResolution) );
2810
2811			baseDiv.appendChild(img);
2812
2813			if(keepPlaceholder) {
2814				setTimeout(function() {
2815					if(item && item.loaded && item.placeholder) {
2816						item.placeholder.style.display = 'none';
2817						item.placeholder = null;
2818					}
2819				}, 500);
2820			}
2821		}
2822	},
2823
2824
2825
2826	_preloadImage = function(item) {
2827		item.loading = true;
2828		item.loaded = false;