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Le blog de Victor Héry https://blog.victor-hery.com
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blog.victor-hery.com/theme/static/photoswipe/photoswipe.js

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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();
return img;
},
_checkForError = function(item, cleanUp) {
if (item.src && item.loadError && item.container) {
if (cleanUp) {
item.container.innerHTML = "";
}
item.container.innerHTML = _options.errorMsg.replace(
"%url%",
item.src
);
return true;
}
},
_setImageSize = function(item, img, maxRes) {
if (!item.src) {
return;
}
if (!img) {
img = item.container.lastChild;
}
var w = maxRes ? item.w : Math.round(item.w * item.fitRatio),
h = maxRes ? item.h : Math.round(item.h * item.fitRatio);
if (item.placeholder && !item.loaded) {
item.placeholder.style.width = w + "px";
item.placeholder.style.height = h + "px";
}
img.style.width = w + "px";
img.style.height = h + "px";
},
_appendImagesPool = function() {
if (_imagesToAppendPool.length) {
var poolItem;
for (var i = 0; i < _imagesToAppendPool.length; i++) {
poolItem = _imagesToAppendPool[i];
if (poolItem.holder.index === poolItem.index) {
_appendImage(
poolItem.index,
poolItem.item,
poolItem.baseDiv,
poolItem.img,
false,
poolItem.clearPlaceholder
);
}
}
_imagesToAppendPool = [];
}
};
_registerModule("Controller", {
publicMethods: {
lazyLoadItem: function(index) {
index = _getLoopedId(index);
var item = _getItemAt(index);
if (!item || ((item.loaded || item.loading) && !_itemsNeedUpdate)) {
return;
}
_shout("gettingData", index, item);
if (!item.src) {
return;
}
_preloadImage(item);
},
initController: function() {
framework.extend(_options, _controllerDefaultOptions, true);
self.items = _items = items;
_getItemAt = self.getItemAt;
_getNumItems = _options.getNumItemsFn; //self.getNumItems;
_initialIsLoop = _options.loop;
if (_getNumItems() < 3) {
_options.loop = false; // disable loop if less then 3 items
}
_listen("beforeChange", function(diff) {
var p = _options.preload,
isNext = diff === null ? true : diff >= 0,
preloadBefore = Math.min(p[0], _getNumItems()),
preloadAfter = Math.min(p[1], _getNumItems()),
i;
for (i = 1; i <= (isNext ? preloadAfter : preloadBefore); i++) {
self.lazyLoadItem(_currentItemIndex + i);
}
for (i = 1; i <= (isNext ? preloadBefore : preloadAfter); i++) {
self.lazyLoadItem(_currentItemIndex - i);
}
});
_listen("initialLayout", function() {
self.currItem.initialLayout =
_options.getThumbBoundsFn &&
_options.getThumbBoundsFn(_currentItemIndex);
});
_listen("mainScrollAnimComplete", _appendImagesPool);
_listen("initialZoomInEnd", _appendImagesPool);
_listen("destroy", function() {
var item;
for (var i = 0; i < _items.length; i++) {
item = _items[i];
// remove reference to DOM elements, for GC
if (item.container) {
item.container = null;
}
if (item.placeholder) {
item.placeholder = null;
}
if (item.img) {
item.img = null;
}
if (item.preloader) {
item.preloader = null;
}
if (item.loadError) {
item.loaded = item.loadError = false;
}
}
_imagesToAppendPool = null;
});
},
getItemAt: function(index) {
if (index >= 0) {
return _items[index] !== undefined ? _items[index] : false;
}
return false;
},
allowProgressiveImg: function() {
// 1. Progressive image loading isn't working on webkit/blink
// when hw-acceleration (e.g. translateZ) is applied to IMG element.
// That's why in PhotoSwipe parent element gets zoom transform, not image itself.
//
// 2. Progressive image loading sometimes blinks in webkit/blink when applying animation to parent element.
// That's why it's disabled on touch devices (mainly because of swipe transition)
//
// 3. Progressive image loading sometimes doesn't work in IE (up to 11).
// Don't allow progressive loading on non-large touch devices
return (
_options.forceProgressiveLoading ||
!_likelyTouchDevice ||
_options.mouseUsed ||
screen.width > 1200
);
// 1200 - to eliminate touch devices with large screen (like Chromebook Pixel)
},
setContent: function(holder, index) {
if (_options.loop) {
index = _getLoopedId(index);
}
var prevItem = self.getItemAt(holder.index);
if (prevItem) {
prevItem.container = null;
}
var item = self.getItemAt(index),
img;
if (!item) {
holder.el.innerHTML = "";
return;
}
// allow to override data
_shout("gettingData", index, item);
holder.index = index;
holder.item = item;
// base container DIV is created only once for each of 3 holders
var baseDiv = (item.container = framework.createEl(
"pswp__zoom-wrap"
));
if (!item.src && item.html) {
if (item.html.tagName) {
baseDiv.appendChild(item.html);
} else {
baseDiv.innerHTML = item.html;
}
}
_checkForError(item);
_calculateItemSize(item, _viewportSize);
if (item.src && !item.loadError && !item.loaded) {
item.loadComplete = function(item) {
// gallery closed before image finished loading
if (!_isOpen) {
return;
}
// check if holder hasn't changed while image was loading
if (holder && holder.index === index) {
if (_checkForError(item, true)) {
item.loadComplete = item.img = null;
_calculateItemSize(item, _viewportSize);
_applyZoomPanToItem(item);
if (holder.index === _currentItemIndex) {
// recalculate dimensions
self.updateCurrZoomItem();
}
return;
}
if (!item.imageAppended) {
if (
_features.transform &&
(_mainScrollAnimating || _initialZoomRunning)
) {
_imagesToAppendPool.push({
item: item,
baseDiv: baseDiv,
img: item.img,
index: index,
holder: holder,
clearPlaceholder: true
});
} else {
_appendImage(
index,
item,
baseDiv,
item.img,
_mainScrollAnimating || _initialZoomRunning,
true
);
}
} else {
// remove preloader & mini-img
if (!_initialZoomRunning && item.placeholder) {
item.placeholder.style.display = "none";
item.placeholder = null;
}
}
}
item.loadComplete = null;
item.img = null; // no need to store image element after it's added
_shout("imageLoadComplete", index, item);
};
if (framework.features.transform) {
var placeholderClassName = "pswp__img pswp__img--placeholder";
placeholderClassName += item.msrc
? ""
: " pswp__img--placeholder--blank";
var placeholder = framework.createEl(
placeholderClassName,
item.msrc ? "img" : ""
);
if (item.msrc) {
placeholder.src = item.msrc;
}
_setImageSize(item, placeholder);
baseDiv.appendChild(placeholder);
item.placeholder = placeholder;
}
if (!item.loading) {
_preloadImage(item);
}
if (self.allowProgressiveImg()) {
// just append image
if (!_initialContentSet && _features.transform) {
_imagesToAppendPool.push({
item: item,
baseDiv: baseDiv,
img: item.img,
index: index,
holder: holder
});
} else {
_appendImage(index, item, baseDiv, item.img, true, true);
}
}
} else if (item.src && !item.loadError) {
// image object is created every time, due to bugs of image loading & delay when switching images
img = framework.createEl("pswp__img", "img");
img.style.opacity = 1;
img.src = item.src;
_setImageSize(item, img);
_appendImage(index, item, baseDiv, img, true);
}
if (!_initialContentSet && index === _currentItemIndex) {
_currZoomElementStyle = baseDiv.style;
_showOrHide(item, img || item.img);
} else {
_applyZoomPanToItem(item);
}
holder.el.innerHTML = "";
holder.el.appendChild(baseDiv);
},
cleanSlide: function(item) {
if (item.img) {
item.img.onload = item.img.onerror = null;
}
item.loaded = item.loading = item.img = item.imageAppended = false;
}
}
});
/*>>items-controller*/
/*>>tap*/
/**
* tap.js:
*
* Displatches tap and double-tap events.
*
*/
var tapTimer,
tapReleasePoint = {},
_dispatchTapEvent = function(origEvent, releasePoint, pointerType) {
var e = document.createEvent("CustomEvent"),
eDetail = {
origEvent: origEvent,
target: origEvent.target,
releasePoint: releasePoint,
pointerType: pointerType || "touch"
};
e.initCustomEvent("pswpTap", true, true, eDetail);
origEvent.target.dispatchEvent(e);
};
_registerModule("Tap", {
publicMethods: {
initTap: function() {
_listen("firstTouchStart", self.onTapStart);
_listen("touchRelease", self.onTapRelease);
_listen("destroy", function() {
tapReleasePoint = {};
tapTimer = null;
});
},
onTapStart: function(touchList) {
if (touchList.length > 1) {
clearTimeout(tapTimer);
tapTimer = null;
}
},
onTapRelease: function(e, releasePoint) {
if (!releasePoint) {
return;
}
if (!_moved && !_isMultitouch && !_numAnimations) {
var p0 = releasePoint;
if (tapTimer) {
clearTimeout(tapTimer);
tapTimer = null;
// Check if taped on the same place
if (_isNearbyPoints(p0, tapReleasePoint)) {
_shout("doubleTap", p0);
return;
}
}
if (releasePoint.type === "mouse") {
_dispatchTapEvent(e, releasePoint, "mouse");
return;
}
var clickedTagName = e.target.tagName.toUpperCase();
// avoid double tap delay on buttons and elements that have class pswp__single-tap
if (
clickedTagName === "BUTTON" ||
framework.hasClass(e.target, "pswp__single-tap")
) {
_dispatchTapEvent(e, releasePoint);
return;
}
_equalizePoints(tapReleasePoint, p0);
tapTimer = setTimeout(function() {
_dispatchTapEvent(e, releasePoint);
tapTimer = null;
}, 300);
}
}
}
});
/*>>tap*/
/*>>desktop-zoom*/
/**
*
* desktop-zoom.js:
*
* - Binds mousewheel event for paning zoomed image.
* - Manages "dragging", "zoomed-in", "zoom-out" classes.
* (which are used for cursors and zoom icon)
* - Adds toggleDesktopZoom function.
*
*/
var _wheelDelta;
_registerModule("DesktopZoom", {
publicMethods: {
initDesktopZoom: function() {
if (_oldIE) {
// no zoom for old IE (<=8)
return;
}
if (_likelyTouchDevice) {
// if detected hardware touch support, we wait until mouse is used,
// and only then apply desktop-zoom features
_listen("mouseUsed", function() {
self.setupDesktopZoom();
});
} else {
self.setupDesktopZoom(true);
}
},
setupDesktopZoom: function(onInit) {
_wheelDelta = {};
var events = "wheel mousewheel DOMMouseScroll";
_listen("bindEvents", function() {
framework.bind(template, events, self.handleMouseWheel);
});
_listen("unbindEvents", function() {
if (_wheelDelta) {
framework.unbind(template, events, self.handleMouseWheel);
}
});
self.mouseZoomedIn = false;
var hasDraggingClass,
updateZoomable = function() {
if (self.mouseZoomedIn) {
framework.removeClass(template, "pswp--zoomed-in");
self.mouseZoomedIn = false;
}
if (_currZoomLevel < 1) {
framework.addClass(template, "pswp--zoom-allowed");
} else {
framework.removeClass(template, "pswp--zoom-allowed");
}
removeDraggingClass();
},
removeDraggingClass = function() {
if (hasDraggingClass) {
framework.removeClass(template, "pswp--dragging");
hasDraggingClass = false;
}
};
_listen("resize", updateZoomable);
_listen("afterChange", updateZoomable);
_listen("pointerDown", function() {
if (self.mouseZoomedIn) {
hasDraggingClass = true;
framework.addClass(template, "pswp--dragging");
}
});
_listen("pointerUp", removeDraggingClass);
if (!onInit) {
updateZoomable();
}
},
handleMouseWheel: function(e) {
if (_currZoomLevel <= self.currItem.fitRatio) {
if (_options.modal) {
if (!_options.closeOnScroll || _numAnimations || _isDragging) {
e.preventDefault();
} else if (_transformKey && Math.abs(e.deltaY) > 2) {
// close PhotoSwipe
// if browser supports transforms & scroll changed enough
_closedByScroll = true;
self.close();
}
}
return true;
}
// allow just one event to fire
e.stopPropagation();
// https://developer.mozilla.org/en-US/docs/Web/Events/wheel
_wheelDelta.x = 0;
if ("deltaX" in e) {
if (e.deltaMode === 1 /* DOM_DELTA_LINE */) {
// 18 - average line height
_wheelDelta.x = e.deltaX * 18;
_wheelDelta.y = e.deltaY * 18;
} else {
_wheelDelta.x = e.deltaX;
_wheelDelta.y = e.deltaY;
}
} else if ("wheelDelta" in e) {
if (e.wheelDeltaX) {
_wheelDelta.x = -0.16 * e.wheelDeltaX;
}
if (e.wheelDeltaY) {
_wheelDelta.y = -0.16 * e.wheelDeltaY;
} else {
_wheelDelta.y = -0.16 * e.wheelDelta;
}
} else if ("detail" in e) {
_wheelDelta.y = e.detail;
} else {
return;
}
_calculatePanBounds(_currZoomLevel, true);
var newPanX = _panOffset.x - _wheelDelta.x,
newPanY = _panOffset.y - _wheelDelta.y;
// only prevent scrolling in nonmodal mode when not at edges
if (
_options.modal ||
(newPanX <= _currPanBounds.min.x &&
newPanX >= _currPanBounds.max.x &&
newPanY <= _currPanBounds.min.y &&
newPanY >= _currPanBounds.max.y)
) {
e.preventDefault();
}
// TODO: use rAF instead of mousewheel?
self.panTo(newPanX, newPanY);
},
toggleDesktopZoom: function(centerPoint) {
centerPoint = centerPoint || {
x: _viewportSize.x / 2 + _offset.x,
y: _viewportSize.y / 2 + _offset.y
};
var doubleTapZoomLevel = _options.getDoubleTapZoom(
true,
self.currItem
);
var zoomOut = _currZoomLevel === doubleTapZoomLevel;
self.mouseZoomedIn = !zoomOut;
self.zoomTo(
zoomOut ? self.currItem.initialZoomLevel : doubleTapZoomLevel,
centerPoint,
333
);
framework[(!zoomOut ? "add" : "remove") + "Class"](
template,
"pswp--zoomed-in"
);
}
}
});
/*>>desktop-zoom*/
/*>>history*/
/**
*
* history.js:
*
* - Back button to close gallery.
*
* - Unique URL for each slide: example.com/&pid=1&gid=3
* (where PID is picture index, and GID and gallery index)
*
* - Switch URL when slides change.
*
*/
var _historyDefaultOptions = {
history: true,
galleryUID: 1
};
var _historyUpdateTimeout,
_hashChangeTimeout,
_hashAnimCheckTimeout,
_hashChangedByScript,
_hashChangedByHistory,
_hashReseted,
_initialHash,
_historyChanged,
_closedFromURL,
_urlChangedOnce,
_windowLoc,
_supportsPushState,
_getHash = function() {
return _windowLoc.hash.substring(1);
},
_cleanHistoryTimeouts = function() {
if (_historyUpdateTimeout) {
clearTimeout(_historyUpdateTimeout);
}
if (_hashAnimCheckTimeout) {
clearTimeout(_hashAnimCheckTimeout);
}
},
// pid - Picture index
// gid - Gallery index
_parseItemIndexFromURL = function() {
var hash = _getHash(),
params = {};
if (hash.length < 5) {
// pid=1
return params;
}
var i,
vars = hash.split("&");
for (i = 0; i < vars.length; i++) {
if (!vars[i]) {
continue;
}
var pair = vars[i].split("=");
if (pair.length < 2) {
continue;
}
params[pair[0]] = pair[1];
}
if (_options.galleryPIDs) {
// detect custom pid in hash and search for it among the items collection
var searchfor = params.pid;
params.pid = 0; // if custom pid cannot be found, fallback to the first item
for (i = 0; i < _items.length; i++) {
if (_items[i].pid === searchfor) {
params.pid = i;
break;
}
}
} else {
params.pid = parseInt(params.pid, 10) - 1;
}
if (params.pid < 0) {
params.pid = 0;
}
return params;
},
_updateHash = function() {
if (_hashAnimCheckTimeout) {
clearTimeout(_hashAnimCheckTimeout);
}
if (_numAnimations || _isDragging) {
// changing browser URL forces layout/paint in some browsers, which causes noticable lag during animation
// that's why we update hash only when no animations running
_hashAnimCheckTimeout = setTimeout(_updateHash, 500);
return;
}
if (_hashChangedByScript) {
clearTimeout(_hashChangeTimeout);
} else {
_hashChangedByScript = true;
}
var pid = _currentItemIndex + 1;
var item = _getItemAt(_currentItemIndex);
if (item.hasOwnProperty("pid")) {
// carry forward any custom pid assigned to the item
pid = item.pid;
}
var newHash =
_initialHash +
"&" +
"gid=" +
_options.galleryUID +
"&" +
"pid=" +
pid;
if (!_historyChanged) {
if (_windowLoc.hash.indexOf(newHash) === -1) {
_urlChangedOnce = true;
}
// first time - add new hisory record, then just replace
}
var newURL = _windowLoc.href.split("#")[0] + "#" + newHash;
if (_supportsPushState) {
if ("#" + newHash !== window.location.hash) {
history[_historyChanged ? "replaceState" : "pushState"](
"",
document.title,
newURL
);
}
} else {
if (_historyChanged) {
_windowLoc.replace(newURL);
} else {
_windowLoc.hash = newHash;
}
}
_historyChanged = true;
_hashChangeTimeout = setTimeout(function() {
_hashChangedByScript = false;
}, 60);
};
_registerModule("History", {
publicMethods: {
initHistory: function() {
framework.extend(_options, _historyDefaultOptions, true);
if (!_options.history) {
return;
}
_windowLoc = window.location;
_urlChangedOnce = false;
_closedFromURL = false;
_historyChanged = false;
_initialHash = _getHash();
_supportsPushState = "pushState" in history;
if (_initialHash.indexOf("gid=") > -1) {
_initialHash = _initialHash.split("&gid=")[0];
_initialHash = _initialHash.split("?gid=")[0];
}
_listen("afterChange", self.updateURL);
_listen("unbindEvents", function() {
framework.unbind(window, "hashchange", self.onHashChange);
});
var returnToOriginal = function() {
_hashReseted = true;
if (!_closedFromURL) {
if (_urlChangedOnce) {
history.back();
} else {
if (_initialHash) {
_windowLoc.hash = _initialHash;
} else {
if (_supportsPushState) {
// remove hash from url without refreshing it or scrolling to top
history.pushState(
"",
document.title,
_windowLoc.pathname + _windowLoc.search
);
} else {
_windowLoc.hash = "";
}
}
}
}
_cleanHistoryTimeouts();
};
_listen("unbindEvents", function() {
if (_closedByScroll) {
// if PhotoSwipe is closed by scroll, we go "back" before the closing animation starts
// this is done to keep the scroll position
returnToOriginal();
}
});
_listen("destroy", function() {
if (!_hashReseted) {
returnToOriginal();
}
});
_listen("firstUpdate", function() {
_currentItemIndex = _parseItemIndexFromURL().pid;
});
var index = _initialHash.indexOf("pid=");
if (index > -1) {
_initialHash = _initialHash.substring(0, index);
if (_initialHash.slice(-1) === "&") {
_initialHash = _initialHash.slice(0, -1);
}
}
setTimeout(function() {
if (_isOpen) {
// hasn't destroyed yet
framework.bind(window, "hashchange", self.onHashChange);
}
}, 40);
},
onHashChange: function() {
if (_getHash() === _initialHash) {
_closedFromURL = true;
self.close();
return;
}
if (!_hashChangedByScript) {
_hashChangedByHistory = true;
self.goTo(_parseItemIndexFromURL().pid);
_hashChangedByHistory = false;
}
},
updateURL: function() {
// Delay the update of URL, to avoid lag during transition,
// and to not to trigger actions like "refresh page sound" or "blinking favicon" to often
_cleanHistoryTimeouts();
if (_hashChangedByHistory) {
return;
}
if (!_historyChanged) {
_updateHash(); // first time
} else {
_historyUpdateTimeout = setTimeout(_updateHash, 800);
}
}
}
});
/*>>history*/
framework.extend(self, publicMethods);
};
return PhotoSwipe;
});