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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 && self.container.contains(e.target)) {
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;
});