photoswipe
Version:
JavaScript gallery
1,987 lines (1,592 loc) • 92.2 kB
JavaScript
/*! PhotoSwipe - v4.0.7 - 2015-03-18
* http://photoswipe.com
* Copyright (c) 2015 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 = navigator.pointerEnabled || 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,
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 : 1.5;
}
},
maxSpreadZoom: 2,
// not fully implemented yet
scaleMode: 'fit', // TODO
modal: true, // TODO
alwaysFadeIn: false // 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 = {},
// 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) {
styleObj[_transformKey] = _translatePrefix + x + 'px, ' + y + 'px' + _translateSufix + ' scale(' + zoom + ')';
},
_applyCurrentZoomPan = function() {
if(_currZoomElementStyle) {
_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);
}
},
_setTranslateX = function(x, elStyle) {
elStyle[_transformKey] = _translatePrefix + x + 'px, 0px' + _translateSufix;
},
_moveMainScroll = function(x, dragging) {
if(!_options.loop && dragging) {
// if of current item during scroll (float)
var newSlideIndexOffset = _currentItemIndex + (_slideSize.x * _currPositionIndex - x)/_slideSize.x;
var 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', self);
_shout('bindEvents');
},
_unbindEvents = function() {
framework.unbind(window, 'resize', 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);
}
_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();
}
},
_onPageScroll = 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;
},
applyZoomPan: function(zoomLevel,panX,panY) {
_panOffset.x = panX;
_panOffset.y = panY;
_currZoomLevel = zoomLevel;
_applyCurrentZoomPan();
},
init: function() {
if(_isOpen || _isDestroying) {
return;
}
var i;
self.framework = framework; // basic function
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,
scroll: _onPageScroll,
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;
}
if(_options.modal) {
template.setAttribute('aria-hidden', 'false');
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');
},
// Closes 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 gallery (unbinds events, cleans up intervals and timeouts to avoid memory leaks)
destroy: function() {
_shout('destroy');
if(_showOrHideTimeout) {
clearTimeout(_showOrHideTimeout);
}
if(_options.modal) {
template.setAttribute('aria-hidden', 'true');
template.className = _initalClassName;
}
if(_updateSizeInterval) {
clearInterval(_updateSizeInterval);
}
framework.unbind(self.scrollWrap, _downEvents, self);
// we unbind lost 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 );
_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 );
_applyZoomPanToItem( prevItem );
}
}
// reset diff after update
_indexDiff = 0;
self.updateCurrZoomItem();
_prevItemIndex = _currentItemIndex;
_shout('afterChange');
},
updateSize: function(force) {
if(!_isFixedPosition) {
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;
_offset = {x:0,y:_currentWindowScrollY};//framework.getOffset(template);
_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);
_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();
}
_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);
// _startZoomLevel = destZoomLevel;
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();
};
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) {
return false;
}
// don't search elements above pswp__scroll-wrap
if(el.className && el.className.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) {
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.pointerEnabled) {
releasePoint.type = e.pointerType || 'mouse';
} else {
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';
}
}
}
}
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.p