lightgallery
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lightGallery is a feature-rich, modular JavaScript gallery plugin for building beautiful image and video galleries for the web and the mobile
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JavaScript
(function(global, factory) {
typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory() : typeof define === "function" && define.amd ? define(factory) : (global = typeof globalThis !== "undefined" ? globalThis : global || self, global.lgZoom = factory());
})(this, function() {
"use strict";/*!
* lightgallery | 3.0.0 | October 9th 2026
* http://www.lightgalleryjs.com/
* Copyright (c) 2020 Sachin Neravath;
* @license GPLv3
*/
const SPRING_SETTLE_DAMPING = 1;
const SPRING_BOUNCE_DAMPING = 0.82;
const SPRING_NATURAL_FREQUENCY = 12;
const DECELERATION_RATE = 0.995;
function project(velocity, decelerationRate = DECELERATION_RATE) {
return velocity * decelerationRate / (1 - decelerationRate);
}
function stepSpring(state, target, dtMs, {
dampingRatio = SPRING_SETTLE_DAMPING,
naturalFrequency = SPRING_NATURAL_FREQUENCY
} = {}) {
const t = dtMs / 1e3;
const w0 = naturalFrequency;
const zeta = Math.min(dampingRatio, 1);
const x0 = state.position - target;
const v0 = state.velocity * 1e3;
const decay = Math.exp(-zeta * w0 * t);
let x;
let v;
if (zeta < 1) {
const wd = w0 * Math.sqrt(1 - zeta * zeta);
const a = x0;
const b = (v0 + zeta * w0 * x0) / wd;
const cos = Math.cos(wd * t);
const sin = Math.sin(wd * t);
x = decay * (a * cos + b * sin);
v = decay * ((b * wd - zeta * w0 * a) * cos - (a * wd + zeta * w0 * b) * sin);
} else {
const b = v0 + w0 * x0;
x = decay * (x0 + b * t);
v = decay * (b - w0 * (x0 + b * t));
}
return { position: target + x, velocity: v / 1e3 };
}
function isSpringSettled(state, target, restDelta = 0.3, restVelocity = 0.012) {
return Math.abs(state.position - target) < restDelta && Math.abs(state.velocity) < restVelocity;
}
function parseImageSize(lgSize, viewportWidth) {
if (!lgSize) {
return void 0;
}
let size = lgSize;
const responsiveSizes = lgSize.split(",");
if (responsiveSizes[1]) {
for (let i = 0; i < responsiveSizes.length; i++) {
const candidate = responsiveSizes[i].trim();
const responsiveWidth = parseInt(candidate.split("-")[2], 10);
if (responsiveWidth > viewportWidth) {
size = candidate;
break;
}
if (i === responsiveSizes.length - 1) {
size = candidate;
}
}
}
const parts = size.trim().split("-");
const width = parseInt(parts[0], 10);
const height = parseInt(parts[1], 10);
if (!Number.isFinite(width) || !Number.isFinite(height)) {
return void 0;
}
return { width, height };
}
function fitImageSize(size, containerWidth, containerHeight) {
const maxWidth = Math.min(containerWidth, size.width);
const maxHeight = Math.min(containerHeight, size.height);
const ratio = Math.min(maxWidth / size.width, maxHeight / size.height);
return { width: size.width * ratio, height: size.height * ratio };
}
const zoomDefaultIcons = {
zoomIn: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" fill="currentColor"><path transform="translate(0, 960) scale(1, -1)" d="M512 512.667h-86v-86h-42v86h-86v42h86v86h42v-86h86v-42zM406 340.667q80 0 136 56t56 136-56 136-136 56-136-56-56-136 56-136 136-56zM662 340.667l212-212-64-64-212 212v34l-12 12q-76-66-180-66-116 0-197 80t-81 196 81 197 197 81 196-81 80-197q0-104-66-180l12-12h34z"/></svg>',
zoomOut: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" fill="currentColor"><path transform="translate(0, 960) scale(1, -1)" d="M298 554.667h214v-42h-214v42zM406 340.667q80 0 136 56t56 136-56 136-136 56-136-56-56-136 56-136 136-56zM662 340.667l212-212-64-64-212 212v34l-12 12q-76-66-180-66-116 0-197 80t-81 196 81 197 197 81 196-81 80-197q0-104-66-180l12-12h34z"/></svg>',
actualSize: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1024 1024" fill="currentColor"><path transform="translate(0, 960) scale(1, -1)" d="M384 853.334h426.667q53 0 90.5-37.5t37.5-90.5v-426.667q0-53-37.5-90.5t-90.5-37.5h-426.667q-53 0-90.5 37.5t-37.5 90.5v426.667q0 53 37.5 90.5t90.5 37.5zM170.667 675.334v-547.333q0-17.667 12.5-30.167t30.167-12.5h547.333q-13.333-37.667-46.333-61.5t-74.333-23.833h-426.667q-53 0-90.5 37.5t-37.5 90.5v426.667q0 41.333 23.833 74.333t61.5 46.333zM810.667 768h-426.667q-17.667 0-30.167-12.5t-12.5-30.167v-426.667q0-17.667 12.5-30.167t30.167-12.5h426.667q17.667 0 30.167 12.5t12.5 30.167v426.667q0 17.667-12.5 30.167t-30.167 12.5z"/></svg>'
};
function getPanBounds(imageWidth, imageHeight, containerWidth, containerHeight, scale) {
return {
maxX: Math.max(0, (imageWidth * scale - containerWidth) / 2),
maxY: Math.max(0, (imageHeight * scale - containerHeight) / 2)
};
}
function getActualSizeScale(naturalWidth, renderedWidth) {
if (!renderedWidth) {
return 2;
}
return naturalWidth / renderedWidth || 2;
}
function getPointZoomPan(point, prevPan, prevScale, newScale) {
const ratio = newScale / prevScale;
return {
x: point.x - (point.x - prevPan.x) * ratio,
y: point.y - (point.y - prevPan.y) * ratio
};
}
function clampPanToStage(pan, bounds, stageBottomExtra) {
const floorY = Math.min(-bounds.maxY + stageBottomExtra, bounds.maxY);
return {
x: Math.min(Math.max(pan.x, -bounds.maxX), bounds.maxX),
y: Math.min(Math.max(pan.y, floorY), bounds.maxY)
};
}
function getPinchPan(currentMid, startMid, startPan, startScale, scale) {
const projected = getPointZoomPan(startMid, startPan, startScale, scale);
return {
x: projected.x + (currentMid.x - startMid.x),
y: projected.y + (currentMid.y - startMid.y)
};
}
function getPointerDistance(a, b) {
return Math.sqrt(
(a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y)
);
}
const PINCH_UNDER_FRICTION = 0.15;
const PINCH_OVER_FRICTION = 0.05;
function getPinchScale(startDistance, currentDistance, startScale, maxScale, infiniteZoom, pinchToCloseArmed = false) {
if (startDistance <= 0) {
return startScale;
}
let scale = currentDistance / startDistance * startScale;
if (scale < 1 && !pinchToCloseArmed) {
scale = 1 + (scale - 1) * PINCH_UNDER_FRICTION;
}
const cap = Math.max(maxScale, 1);
if (!infiniteZoom && scale > cap) {
scale = cap + (scale - cap) * PINCH_OVER_FRICTION;
}
return scale;
}
function shouldCloseOnPinch(input) {
return input.pinchToClose && input.closable && input.scale < 1 && input.maxGestureScale <= 1;
}
function parseSrcset(srcset) {
const candidates = [];
if (typeof srcset !== "string") {
return candidates;
}
for (const entry of srcset.split(",")) {
const parts = entry.trim().split(/\s+/);
const url = parts[0];
if (!url) {
continue;
}
const descriptor = parts[1];
if (!descriptor) {
candidates.push({ url, density: 1 });
continue;
}
const value = parseFloat(descriptor);
if (Number.isNaN(value) || value <= 0) {
continue;
}
if (descriptor.endsWith("w")) {
candidates.push({ url, width: value });
} else if (descriptor.endsWith("x")) {
candidates.push({ url, density: value });
}
}
return candidates;
}
function matchesMedia(media, viewport) {
if (!media) {
return true;
}
const condition = /^\(\s*(min|max)-width:\s*([\d.]+)px\s*\)$/.exec(
media.trim()
);
if (!condition) {
return false;
}
const bound = parseFloat(condition[2]);
return condition[1] === "min" ? viewport.width >= bound : viewport.width <= bound;
}
function getActualSizeWidth(item, viewport, naturalWidth) {
if (item.width) {
const declared = parseFloat(item.width);
if (!Number.isNaN(declared) && declared > 0) {
return declared;
}
}
let candidates = [];
const sources = Array.isArray(item.sources) ? item.sources : [];
for (const source of sources) {
if (matchesMedia(source.media, viewport)) {
candidates = parseSrcset(source.srcset);
break;
}
}
if (!candidates.length && item.srcset) {
candidates = parseSrcset(item.srcset);
}
const widths = candidates.map((candidate) => candidate.width).filter((width) => width !== void 0);
if (widths.length) {
return Math.max(...widths);
}
const natural = parseImageSize(item.lgSize, viewport.width);
if (natural && natural.width > 0) {
return natural.width;
}
return naturalWidth;
}
const VELOCITY_WINDOW_MS = 100;
const MIN_DISPLACEMENT = 1;
const MIN_WINDOW_SPAN_MS = 5;
function pushVelocitySample(samples, sample, windowMs = VELOCITY_WINDOW_MS) {
return [...samples.filter((s) => sample.t - s.t <= windowMs), sample];
}
function getWindowedVelocity(samples, releaseTime, windowMs = VELOCITY_WINDOW_MS) {
const recent = samples.filter((s) => releaseTime - s.t <= windowMs);
if (recent.length < 2) {
return { x: 0, y: 0 };
}
const first = recent[0];
const last = recent[recent.length - 1];
const dt = last.t - first.t;
if (dt < MIN_WINDOW_SPAN_MS) {
return { x: 0, y: 0 };
}
const dx = last.x - first.x;
const dy = last.y - first.y;
return {
x: Math.abs(dx) > MIN_DISPLACEMENT ? dx / dt : 0,
y: Math.abs(dy) > MIN_DISPLACEMENT ? dy / dt : 0
};
}
function getRotatedVisualSize(width, height, transform) {
if (!transform) {
return { width, height };
}
const rotate = /rotate\((-?\d+(?:\.\d+)?)deg\)/.exec(transform);
const scale = /scale3d\((-?\d+(?:\.\d+)?)/.exec(transform);
const fit = (scale == null ? void 0 : scale[1]) ? Math.abs(parseFloat(scale[1])) : 1;
const degrees = (rotate == null ? void 0 : rotate[1]) ? parseFloat(rotate[1]) : 0;
const normalized = (degrees % 360 + 360) % 360;
return normalized === 90 || normalized === 270 ? { width: height * fit, height: width * fit } : { width: width * fit, height: height * fit };
}
const MAX_FRAME_MS = 64;
function runSprings(tracks, onFrame, onDone) {
let raf = 0;
let last = Date.now();
const states = tracks.map((t) => ({
position: t.from,
velocity: t.velocity
}));
const frame = () => {
const now = Date.now();
const dt = Math.min(Math.max(now - last, 0), MAX_FRAME_MS);
last = now;
let settled = true;
tracks.forEach((t, i) => {
states[i] = stepSpring(states[i], t.target, dt, t);
if (!isSpringSettled(states[i], t.target)) {
settled = false;
}
});
if (settled) {
onFrame(tracks.map((t) => t.target));
onDone == null ? void 0 : onDone();
return;
}
onFrame(states.map((s) => s.position));
raf = requestAnimationFrame(frame);
};
raf = requestAnimationFrame(frame);
return () => cancelAnimationFrame(raf);
}
const zoomSettings = {
scale: 1,
zoom: true,
infiniteZoom: true,
actualSize: true,
showZoomInOutIcons: false,
actualSizeIcons: {
zoomIn: "lg-zoom-in",
zoomOut: "lg-zoom-out"
},
enableZoomAfter: 300
};
const lGEvents = {
containerResize: "lgContainerResize",
beforeOpen: "lgBeforeOpen",
afterOpen: "lgAfterOpen",
slideItemLoad: "lgSlideItemLoad",
afterSlide: "lgAfterSlide",
rotateLeft: "lgRotateLeft",
rotateRight: "lgRotateRight",
flipHorizontal: "lgFlipHorizontal",
flipVertical: "lgFlipVertical"
};
var __defProp = Object.defineProperty;
var __getOwnPropSymbols = Object.getOwnPropertySymbols;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __propIsEnum = Object.prototype.propertyIsEnumerable;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __spreadValues = (a, b) => {
for (var prop in b || (b = {}))
if (__hasOwnProp.call(b, prop))
__defNormalProp(a, prop, b[prop]);
if (__getOwnPropSymbols)
for (var prop of __getOwnPropSymbols(b)) {
if (__propIsEnum.call(b, prop))
__defNormalProp(a, prop, b[prop]);
}
return a;
};
const ZOOM_TRANSITION_DURATION = 500;
class Zoom {
constructor(instance, $LG) {
this.core = instance;
this.$LG = $LG;
this.settings = __spreadValues(__spreadValues({}, zoomSettings), this.core.settings);
return this;
}
// Append Zoom controls. Actual size, Zoom-in, Zoom-out
buildTemplates() {
var _a, _b, _c, _d, _e, _f;
const gestureButtons = this.core.settings.showGestureButtons !== false;
let zoomIcons = gestureButtons && this.settings.showZoomInOutIcons ? `<button id="${this.core.getIdName(
"lg-zoom-in"
)}" type="button" aria-label="${(_b = (_a = this.settings.zoomPluginStrings) == null ? void 0 : _a.zoomIn) != null ? _b : this.core.settings.strings.zoomIn}" class="lg-zoom-in lg-icon"></button><button id="${this.core.getIdName(
"lg-zoom-out"
)}" type="button" aria-label="${(_d = (_c = this.settings.zoomPluginStrings) == null ? void 0 : _c.zoomOut) != null ? _d : this.core.settings.strings.zoomOut}" class="lg-zoom-out lg-icon"></button>` : "";
if (gestureButtons && this.settings.actualSize) {
zoomIcons += `<button id="${this.core.getIdName(
"lg-actual-size"
)}" type="button" aria-label="${(_f = (_e = this.settings.zoomPluginStrings) == null ? void 0 : _e.viewActualSize) != null ? _f : this.core.settings.strings.viewActualSize}" class="${this.settings.actualSizeIcons.zoomIn} lg-icon"></button>`;
}
this.core.outer.addClass("lg-use-transition-for-zoom");
this.core.$toolbar.first().append(zoomIcons);
}
/**
* @desc Enable zoom option only once the image is completely loaded
* If zoomFromOrigin is true, Zoom is enabled once the dummy image has been inserted
*
* Zoom styles are defined under lg-zoomable CSS class.
*/
enableZoom(event) {
let _speed = this.settings.enableZoomAfter + event.detail.delay;
if (this.$LG("body").first().hasClass("lg-from-hash") && event.detail.delay) {
_speed = 0;
} else {
this.$LG("body").first().removeClass("lg-from-hash");
}
this.zoomableTimeout = setTimeout(() => {
if (!this.isImageSlide(this.core.index)) {
return;
}
this.core.getSlideItem(event.detail.index).addClass("lg-zoomable");
if (event.detail.index === this.core.index) {
this.setZoomEssentials();
}
}, _speed + 30);
}
enableZoomOnSlideItemLoad() {
this.core.LGel.on(
`${lGEvents.slideItemLoad}.zoom`,
this.enableZoom.bind(this)
);
}
getDragCords(e) {
return {
x: e.pageX,
y: e.pageY
};
}
getSwipeCords(e) {
const x = e.touches[0].pageX;
const y = e.touches[0].pageY;
return {
x,
y
};
}
getDragAllowedAxises(scale, scaleDiff) {
if (!this.containerRect) {
return {
allowX: false,
allowY: false
};
}
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first().get();
let height = 0;
let width = 0;
const rect = $image.getBoundingClientRect();
if (scale) {
const visual = this.getVisualImageSize(
$image,
$image.offsetWidth,
$image.offsetHeight
);
height = visual.height * scale;
width = visual.width * scale;
} else if (scaleDiff) {
height = rect.height + scaleDiff * rect.height;
width = rect.width + scaleDiff * rect.width;
} else if (this.core.currentImageSize) {
const visual = this.getVisualImageSize(
$image,
this.core.currentImageSize.width,
this.core.currentImageSize.height
);
height = visual.height * this.scale;
width = visual.width * this.scale;
} else {
height = rect.height;
width = rect.width;
}
const allowY = height > this.containerRect.height;
const allowX = width > this.containerRect.width;
return {
allowX,
allowY
};
}
setZoomEssentials() {
this.containerRect = this.core.$content.get().getBoundingClientRect();
}
/**
* @desc Image zoom
* Translate the wrap and scale the image to get better user experience
*
* @param {String} scale - Zoom decrement/increment value
*/
zoomImage(scale, scaleDiff, reposition, resetToMax) {
if (!this.containerRect || Math.abs(scaleDiff) <= 0) return;
const offsetX = this.containerRect.width / 2 + this.containerRect.left;
const offsetY = this.containerRect.height / 2 + this.containerRect.top + this.scrollTop;
let originalX;
let originalY;
if (scale === 1) {
this.positionChanged = false;
}
if (this.positionChanged) {
const previousScale = this.scale - scaleDiff;
originalX = previousScale ? this.left / previousScale : 0;
originalY = previousScale ? this.top / previousScale : 0;
this.pageX = offsetX - originalX;
this.pageY = offsetY - originalY;
this.positionChanged = false;
}
let x;
let y;
let _x = offsetX - this.pageX;
let _y = offsetY - this.pageY;
if (scale - scaleDiff > 1) {
const scaleVal = (scale - scaleDiff) / Math.abs(scaleDiff);
_x = (scaleDiff < 0 ? -_x : _x) + this.left * (scaleVal + (scaleDiff < 0 ? -1 : 1));
_y = (scaleDiff < 0 ? -_y : _y) + this.top * (scaleVal + (scaleDiff < 0 ? -1 : 1));
x = _x / scaleVal;
y = _y / scaleVal;
} else {
const scaleVal = (scale - scaleDiff) * scaleDiff;
x = _x * scaleVal;
y = _y * scaleVal;
}
if (reposition) {
const clamped = this.clampPinchPan({ x, y }, scale);
x = clamped.x;
y = clamped.y;
}
this.setZoomStyles({
x,
y,
scale
});
this.left = x;
this.top = y;
if (resetToMax) {
this.setZoomImageSize();
}
}
resetImageTranslate(index) {
if (!this.isImageSlide(index)) {
return;
}
const $image = this.core.getSlideItem(index).find(".lg-image").first();
this.imageReset = false;
$image.removeClass(
"reset-transition reset-transition-y reset-transition-x"
);
this.core.outer.removeClass("lg-actual-size");
$image.css("width", "auto").css("height", "auto");
setTimeout(() => {
$image.removeClass("no-transition");
}, 10);
}
setZoomImageSize(delay = ZOOM_TRANSITION_DURATION) {
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first();
setTimeout(() => {
if (this.core.touchAction) {
return;
}
const actualSizeScale = this.getCurrentImageActualSizeScale();
if (this.scale >= actualSizeScale) {
$image.addClass("no-transition");
this.imageReset = true;
}
}, delay);
setTimeout(() => {
if (this.core.touchAction) {
return;
}
const actualSizeScale = this.getCurrentImageActualSizeScale();
if (this.scale >= actualSizeScale) {
const dragAllowedAxises = this.getDragAllowedAxises(this.scale);
const image = $image.get();
const referenceWidth = this.getNaturalWidth(this.core.index);
const referenceHeight = image.naturalWidth > 0 ? referenceWidth * image.naturalHeight / image.naturalWidth : image.naturalHeight;
$image.css("width", referenceWidth + "px").css("height", referenceHeight + "px");
this.core.outer.addClass("lg-actual-size");
if (dragAllowedAxises.allowX && dragAllowedAxises.allowY) {
$image.addClass("reset-transition");
} else if (dragAllowedAxises.allowX && !dragAllowedAxises.allowY) {
$image.addClass("reset-transition-x");
} else if (!dragAllowedAxises.allowX && dragAllowedAxises.allowY) {
$image.addClass("reset-transition-y");
}
}
}, delay + 50);
}
/**
* @desc apply scale3d to image and translate to image wrap
* @param {style} X,Y and scale
*/
setZoomStyles(style) {
const $imageWrap = this.core.getSlideItem(this.core.index).find(".lg-img-wrap").first();
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first();
const $dummyImage = this.core.outer.find(".lg-current .lg-dummy-img").first();
this.scale = style.scale;
$image.css(
"transform",
"scale3d(" + style.scale + ", " + style.scale + ", 1)"
);
$dummyImage.css(
"transform",
"scale3d(" + style.scale + ", " + style.scale + ", 1)"
);
const transform = "translate3d(" + style.x + "px, " + style.y + "px, 0)";
$imageWrap.css("transform", transform);
}
/**
* @param index - Index of the current slide
* @param event - event will be available only if the function is called on clicking/taping the imags
*/
setActualSize(index, event) {
if (this.zoomInProgress) {
return;
}
this.zoomInProgress = true;
const currentItem = this.core.galleryItems[this.core.index];
this.resetImageTranslate(index);
setTimeout(() => {
if (!currentItem.src || this.core.outer.hasClass("lg-first-slide-loading")) {
return;
}
const scale = this.getCurrentImageActualSizeScale();
const prevScale = this.scale;
if (this.core.outer.hasClass("lg-zoomed")) {
this.scale = 1;
} else {
this.scale = this.getScale(scale);
}
this.setPageCords(event);
this.beginZoom(this.scale);
this.zoomImage(this.scale, this.scale - prevScale, true, true);
}, 50);
setTimeout(() => {
this.core.outer.removeClass("lg-grabbing").addClass("lg-grab");
}, 60);
setTimeout(() => {
this.zoomInProgress = false;
}, ZOOM_TRANSITION_DURATION + 110);
}
getNaturalWidth(index) {
const $image = this.core.getSlideItem(index).find(".lg-image").first();
return getActualSizeWidth(
this.core.galleryItems[index],
{
width: window.innerWidth
},
$image.get().naturalWidth
);
}
getActualSizeScale(naturalWidth, width) {
let scale;
if (naturalWidth >= width) {
scale = getActualSizeScale(naturalWidth, width);
} else {
scale = 1;
}
return scale;
}
getCurrentImageActualSizeScale() {
var _a;
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first();
const image = $image.get();
let width = (_a = this.core.currentImageSize) == null ? void 0 : _a.width;
if (!width) {
if (this.core.outer.hasClass("lg-actual-size")) {
if (!this.containerRect) {
this.setZoomEssentials();
}
const referenceWidth = this.getNaturalWidth(this.core.index);
const referenceHeight = image.naturalWidth > 0 ? referenceWidth * image.naturalHeight / image.naturalWidth : image.naturalHeight;
width = fitImageSize(
{
width: referenceWidth,
height: referenceHeight
},
this.containerRect.width,
this.containerRect.height
).width;
} else {
width = image.offsetWidth;
}
}
const naturalWidth = this.getNaturalWidth(this.core.index) || width;
return this.getActualSizeScale(naturalWidth, width);
}
getPageCords(event) {
const cords = {};
if (event) {
cords.x = event.pageX || event.touches[0].pageX;
cords.y = event.pageY || event.touches[0].pageY;
} else {
const containerRect = this.core.$content.get().getBoundingClientRect();
cords.x = containerRect.width / 2 + containerRect.left;
cords.y = containerRect.height / 2 + this.scrollTop + containerRect.top;
}
return cords;
}
setPageCords(event) {
const pageCords = this.getPageCords(event);
this.pageX = pageCords.x;
this.pageY = pageCords.y;
}
manageActualPixelClassNames() {
const $actualSize = this.core.getElementById("lg-actual-size");
$actualSize.removeClass(this.settings.actualSizeIcons.zoomIn).addClass(this.settings.actualSizeIcons.zoomOut);
}
// If true, zoomed - in else zoomed out
beginZoom(scale) {
this.core.outer.removeClass("lg-zoom-drag-transition lg-zoom-dragging");
if (scale > 1) {
this.core.outer.addClass("lg-zoomed");
this.manageActualPixelClassNames();
} else {
this.resetZoom();
}
return scale > 1;
}
getScale(scale) {
const actualSizeScale = this.getCurrentImageActualSizeScale();
if (scale < 1) {
scale = 1;
} else if (scale > actualSizeScale) {
scale = actualSizeScale;
}
return scale;
}
init() {
this.core.registerDefaultIcons(zoomDefaultIcons);
if (!this.settings.zoom) {
return;
}
this.buildTemplates();
this.enableZoomOnSlideItemLoad();
let tapped = null;
this.core.outer.on("dblclick.lg", (event) => {
if (!this.$LG(event.target).hasClass("lg-image")) {
return;
}
this.setActualSize(this.core.index, event);
});
this.core.outer.on("touchstart.lg", (event) => {
const $target = this.$LG(event.target);
if (event.touches.length === 1 && $target.hasClass("lg-image")) {
if (!tapped) {
tapped = setTimeout(() => {
tapped = null;
}, 300);
} else {
clearTimeout(tapped);
tapped = null;
event.preventDefault();
this.setActualSize(this.core.index, event);
}
}
});
this.core.LGel.on(
`${lGEvents.containerResize}.zoom ${lGEvents.rotateRight}.zoom ${lGEvents.rotateLeft}.zoom ${lGEvents.flipHorizontal}.zoom ${lGEvents.flipVertical}.zoom`,
() => {
if (!this.core.lgOpened || !this.isImageSlide(this.core.index) || this.core.touchAction) {
return;
}
this.stopZoomSpring();
const _LGel = this.core.getSlideItem(this.core.index).find(".lg-img-wrap").first();
this.top = 0;
this.left = 0;
this.setZoomEssentials();
this.setZoomSwipeStyles(_LGel, { x: 0, y: 0 });
this.positionChanged = true;
}
);
this.$LG(window).on(`scroll.lg.zoom.global${this.core.lgId}`, () => {
if (!this.core.lgOpened) return;
this.scrollTop = this.$LG(window).scrollTop();
});
this.core.getElementById("lg-zoom-out").on("click.lg", () => {
if (!this.isImageSlide(this.core.index)) {
return;
}
let timeout = 0;
if (this.imageReset) {
this.resetImageTranslate(this.core.index);
timeout = 50;
}
setTimeout(() => {
let scale = this.scale - this.settings.scale;
if (scale < 1) {
scale = 1;
}
this.beginZoom(scale);
this.zoomImage(
scale,
-this.settings.scale,
true,
!this.settings.infiniteZoom
);
}, timeout);
});
this.core.getElementById("lg-zoom-in").on("click.lg", () => {
this.zoomIn();
});
this.core.getElementById("lg-actual-size").on("click.lg", () => {
this.setActualSize(this.core.index);
});
this.core.LGel.on(`${lGEvents.beforeOpen}.zoom`, () => {
this.core.outer.find(".lg-item").removeClass("lg-zoomable");
});
this.core.LGel.on(`${lGEvents.afterOpen}.zoom`, () => {
this.scrollTop = this.$LG(window).scrollTop();
this.pageX = this.core.outer.width() / 2;
this.pageY = this.core.outer.height() / 2 + this.scrollTop;
this.scale = 1;
});
this.core.LGel.on(
`${lGEvents.afterSlide}.zoom`,
(event) => {
const { prevIndex } = event.detail;
this.scale = 1;
this.positionChanged = false;
this.zoomInProgress = false;
this.resetZoom(prevIndex);
this.resetImageTranslate(prevIndex);
if (this.isImageSlide(this.core.index)) {
this.setZoomEssentials();
}
}
);
this.zoomDrag();
this.pinchZoom();
this.zoomSwipe();
this.zoomableTimeout = false;
this.positionChanged = false;
this.zoomInProgress = false;
}
zoomIn() {
if (!this.isImageSlide(this.core.index)) {
return;
}
let scale = this.scale + this.settings.scale;
if (!this.settings.infiniteZoom) {
scale = this.getScale(scale);
}
this.beginZoom(scale);
this.zoomImage(
scale,
Math.min(this.settings.scale, scale - this.scale),
true,
!this.settings.infiniteZoom
);
}
// Reset zoom effect
resetZoom(index) {
this.stopZoomSpring();
this.core.outer.removeClass("lg-zoomed lg-zoom-drag-transition");
const $actualSize = this.core.getElementById("lg-actual-size");
const $item = this.core.getSlideItem(
index !== void 0 ? index : this.core.index
);
$actualSize.removeClass(this.settings.actualSizeIcons.zoomOut).addClass(this.settings.actualSizeIcons.zoomIn);
$item.find(".lg-img-wrap").first().removeAttr("style");
$item.find(".lg-image").first().removeAttr("style");
this.scale = 1;
this.left = 0;
this.top = 0;
this.setPageCords();
}
/** Stop a running release spring; state stays at its live values. */
stopZoomSpring() {
if (this.cancelZoomSpring) {
this.cancelZoomSpring();
this.cancelZoomSpring = void 0;
}
}
/**
* Any gesture end must leave the image inside its pan bounds: a tap
* interrupts a settling spring (stopZoomSpring at its touchstart),
* and if it never turns into a drag nothing else re-clamps, the
* fused pinch pan can legitimately be far outside mid-settle.
* Springs home from wherever the interruption stopped it; a no-op
* when already in bounds (the common tap).
*/
settleIntoBounds() {
this.setZoomEssentials();
const rect = this.core.getSlideItem(this.core.index).find(".lg-image").first().get().getBoundingClientRect();
const actualSizeScale = this.getCurrentImageActualSizeScale();
const targetScale = this.settings.infiniteZoom ? Math.max(this.scale, 1) : Math.min(Math.max(this.scale, 1), Math.max(actualSizeScale, 1));
const sizeRatio = this.scale > 0 ? targetScale / this.scale : 1;
const width = rect.width * sizeRatio;
const height = rect.height * sizeRatio;
const { bottom } = this.core.mediaContainerPosition;
const halfX = Math.abs(width - this.containerRect.width) / 2;
const halfY = Math.abs(height - this.containerRect.height) / 2;
const floorY = height > this.containerRect.height ? Math.min(-halfY + bottom, halfY) : -halfY;
const targetX = Math.min(Math.max(this.left, -halfX), halfX);
const targetY = Math.min(Math.max(this.top, floorY), halfY);
if (Math.abs(targetX - this.left) < 1 && Math.abs(targetY - this.top) < 1 && Math.abs(targetScale - this.scale) < 1e-3) {
return;
}
this.core.outer.addClass("lg-zoom-drag-transition lg-zoom-dragging");
this.stopZoomSpring();
this.cancelZoomSpring = runSprings(
[
{ from: this.scale, velocity: 0, target: targetScale },
{ from: this.left, velocity: 0, target: targetX },
{ from: this.top, velocity: 0, target: targetY }
],
([scale, x, y]) => {
this.left = x;
this.top = y;
this.setZoomStyles({ x, y, scale });
},
() => {
this.cancelZoomSpring = void 0;
this.core.outer.removeClass(
"lg-zoom-dragging lg-zoom-drag-transition"
);
if (targetScale > 1 && targetScale >= Math.max(actualSizeScale, 1)) {
this.setZoomImageSize(0);
}
}
);
}
getTouchDistance(e) {
return getPointerDistance(
{ x: e.touches[0].pageX, y: e.touches[0].pageY },
{ x: e.touches[1].pageX, y: e.touches[1].pageY }
);
}
/**
* Pinch midpoint relative to the stage centre, the focal anchor the
* whole gesture projects through.
*/
getPinchMidPoint(e) {
const centerX = this.containerRect.width / 2 + this.containerRect.left;
const centerY = this.containerRect.height / 2 + this.containerRect.top + this.scrollTop;
return {
x: (e.touches[0].pageX + e.touches[1].pageX) / 2 - centerX,
y: (e.touches[0].pageY + e.touches[1].pageY) / 2 - centerY
};
}
/**
* Clamp a pan into the stage-aware bounds at the given scale,
* measured from the untransformed layout size (offset dimensions
* ignore transforms, so this stays correct mid-gesture). Y matches
* `getPossibleSwipeDragCords`: the vacated components strip belongs
* to the stage, so the pan-up floor sits where the image's bottom
* edge meets the SCREEN bottom, not the content box.
*/
/**
* Bounds-relevant size of the image: layout offsets swapped and
* shrunk by the rotate plugin's wrapper transform when present,
* at 90°/270° the visual width runs along the layout height, and
* offsets don't see transforms.
*/
getVisualImageSize($image, width, height) {
const rotateWrap = $image.closest(".lg-img-rotate");
return getRotatedVisualSize(width, height, rotateWrap == null ? void 0 : rotateWrap.style.transform);
}
clampPinchPan(pan, scale) {
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first().get();
const visual = this.getVisualImageSize(
$image,
$image.offsetWidth,
$image.offsetHeight
);
const bounds = getPanBounds(
visual.width,
visual.height,
this.containerRect.width,
this.containerRect.height,
scale
);
return clampPanToStage(
pan,
bounds,
this.core.mediaContainerPosition.bottom
);
}
pinchZoom() {
let startDist = 0;
let pinchStarted = false;
let initScale = 1;
let startMaxScale = 1;
let startPan = { x: 0, y: 0 };
let startMid = { x: 0, y: 0 };
let maxGestureScale = 1;
let lastMid = { x: 0, y: 0 };
let midSamples = [];
let $item = this.core.getSlideItem(this.core.index);
this.core.outer.on("touchstart.lg", (e) => {
$item = this.core.getSlideItem(this.core.index);
if (!this.isImageSlide(this.core.index)) {
return;
}
if (e.touches.length === 2) {
e.preventDefault();
if (this.core.outer.hasClass("lg-first-slide-loading")) {
return;
}
this.stopZoomSpring();
this.setZoomEssentials();
initScale = this.scale || 1;
startPan = { x: this.left, y: this.top };
startMid = this.getPinchMidPoint(e);
this.core.outer.addClass(
"lg-zoom-drag-transition lg-zoom-dragging"
);
this.setPageCords(e);
this.resetImageTranslate(this.core.index);
startMaxScale = this.getCurrentImageActualSizeScale();
this.core.touchAction = "pinch";
startDist = this.getTouchDistance(e);
maxGestureScale = initScale;
lastMid = startMid;
midSamples = [{ x: startMid.x, y: startMid.y, t: Date.now() }];
}
});
this.core.$inner.on("touchmove.lg", (e) => {
if (e.touches.length === 2 && this.core.touchAction === "pinch" && (this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target))) {
e.preventDefault();
const endDist = this.getTouchDistance(e);
const distance = startDist - endDist;
if (!pinchStarted && Math.abs(distance) > 5) {
pinchStarted = true;
}
if (pinchStarted) {
const closeArmed = this.core.settings.pinchToClose && this.core.settings.closable && maxGestureScale <= 1;
const _scale = getPinchScale(
startDist,
endDist,
initScale,
startMaxScale,
this.settings.infiniteZoom,
closeArmed
);
const scale = Math.round((_scale + Number.EPSILON) * 1e4) / 1e4;
const mid = this.getPinchMidPoint(e);
lastMid = mid;
midSamples = pushVelocitySample(midSamples, {
x: mid.x,
y: mid.y,
t: Date.now()
});
const pan = getPinchPan(
mid,
startMid,
startPan,
initScale,
scale
);
this.left = pan.x;
this.top = pan.y;
this.setZoomStyles({ x: pan.x, y: pan.y, scale });
maxGestureScale = Math.max(maxGestureScale, scale);
}
}
});
this.core.$inner.on("touchend.lg", (e) => {
if (this.core.touchAction === "pinch" && (this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target))) {
pinchStarted = false;
startDist = 0;
if (shouldCloseOnPinch({
scale: this.scale,
maxGestureScale,
pinchToClose: this.core.settings.pinchToClose,
closable: this.core.settings.closable
})) {
this.core.outer.removeClass("lg-zoom-dragging");
this.resetZoom();
this.core.closeGallery();
} else if (this.scale <= 1) {
this.core.outer.removeClass("lg-zoomed");
this.stopZoomSpring();
this.cancelZoomSpring = runSprings(
[
{ from: this.scale, velocity: 0, target: 1 },
{ from: this.left, velocity: 0, target: 0 },
{ from: this.top, velocity: 0, target: 0 }
],
([scale, x, y]) => {
this.left = x;
this.top = y;
this.setZoomStyles({
x,
y,
scale
});
},
() => {
this.cancelZoomSpring = void 0;
this.core.outer.removeClass("lg-zoom-dragging");
this.resetZoom();
}
);
} else {
const actualSizeScale = startMaxScale;
const targetScale = Math.min(
this.scale,
Math.max(actualSizeScale, 1)
);
const midVelocity = getWindowedVelocity(
midSamples,
Date.now()
);
const basePan = getPinchPan(
lastMid,
startMid,
startPan,
initScale,
targetScale
);
const glide = {
x: basePan.x + project(midVelocity.x),
y: basePan.y + project(midVelocity.y)
};
const pan = this.clampPinchPan(glide, targetScale);
this.positionChanged = true;
this.manageActualPixelClassNames();
this.core.outer.addClass("lg-zoomed");
this.stopZoomSpring();
this.cancelZoomSpring = runSprings(
[
{
from: this.scale,
velocity: 0,
target: targetScale
},
{
from: this.left,
velocity: midVelocity.x,
target: pan.x,
dampingRatio: pan.x !== glide.x ? SPRING_BOUNCE_DAMPING : 1
},
{
from: this.top,
velocity: midVelocity.y,
target: pan.y,
dampingRatio: pan.y !== glide.y ? SPRING_BOUNCE_DAMPING : 1
}
],
([scale, x, y]) => {
this.left = x;
this.top = y;
this.setZoomStyles({
x,
y,
scale
});
},
() => {
this.cancelZoomSpring = void 0;
this.core.outer.removeClass(
"lg-zoom-dragging lg-zoom-drag-transition"
);
if (targetScale >= actualSizeScale) {
this.setZoomImageSize(0);
}
}
);
}
this.core.touchAction = void 0;
}
});
}
touchendZoom(startCoords, endCoords, allowX, allowY, velocity) {
const _LGel = this.core.getSlideItem(this.core.index).find(".lg-img-wrap").first();
const possibleSwipeCords = this.getPossibleSwipeDragCords();
const current = this.getZoomSwipeCords(
startCoords,
endCoords,
allowX,
allowY,
possibleSwipeCords
);
const clampAxis = (value, min, max) => Math.min(Math.max(value, max), min);
const targetX = allowX ? clampAxis(
current.x + project(velocity.x),
possibleSwipeCords.minX,
possibleSwipeCords.maxX
) : this.left;
const targetY = allowY ? clampAxis(
current.y + project(velocity.y),
possibleSwipeCords.minY,
possibleSwipeCords.maxY
) : this.top;
this.positionChanged = true;
if (Math.abs(targetX - current.x) < 1 && Math.abs(targetY - current.y) < 1) {
this.left = targetX;
this.top = targetY;
this.setZoomSwipeStyles(_LGel, { x: targetX, y: targetY });
this.core.outer.removeClass(
"lg-zoom-dragging lg-zoom-drag-transition"
);
return;
}
this.core.outer.addClass("lg-zoom-dragging");
this.stopZoomSpring();
this.cancelZoomSpring = runSprings(
[
{
from: current.x,
velocity: velocity.x,
target: targetX,
dampingRatio: targetX !== current.x + project(velocity.x) ? SPRING_BOUNCE_DAMPING : 1
},
{
from: current.y,
velocity: velocity.y,
target: targetY,
dampingRatio: targetY !== current.y + project(velocity.y) ? SPRING_BOUNCE_DAMPING : 1
}
],
([x, y]) => {
this.left = x;
this.top = y;
this.setZoomSwipeStyles(_LGel, { x, y });
},
() => {
this.cancelZoomSpring = void 0;
this.core.outer.removeClass(
"lg-zoom-dragging lg-zoom-drag-transition"
);
}
);
}
getZoomSwipeCords(startCoords, endCoords, allowX, allowY, possibleSwipeCords) {
const distance = {};
if (allowY) {
distance.y = this.top + (endCoords.y - startCoords.y);
if (this.isBeyondPossibleTop(distance.y, possibleSwipeCords.minY)) {
const diffMinY = possibleSwipeCords.minY - distance.y;
distance.y = possibleSwipeCords.minY - diffMinY / 6;
} else if (this.isBeyondPossibleBottom(distance.y, possibleSwipeCords.maxY)) {
const diffMaxY = distance.y - possibleSwipeCords.maxY;
distance.y = possibleSwipeCords.maxY + diffMaxY / 6;
}
} else {
distance.y = this.top;
}
if (allowX) {
distance.x = this.left + (endCoords.x - startCoords.x);
if (this.isBeyondPossibleLeft(distance.x, possibleSwipeCords.minX)) {
const diffMinX = possibleSwipeCords.minX - distance.x;
distance.x = possibleSwipeCords.minX - diffMinX / 6;
} else if (this.isBeyondPossibleRight(distance.x, possibleSwipeCords.maxX)) {
const difMaxX = distance.x - possibleSwipeCords.maxX;
distance.x = possibleSwipeCords.maxX + difMaxX / 6;
}
} else {
distance.x = this.left;
}
return distance;
}
isBeyondPossibleLeft(x, minX) {
return x >= minX;
}
isBeyondPossibleRight(x, maxX) {
return x <= maxX;
}
isBeyondPossibleTop(y, minY) {
return y >= minY;
}
isBeyondPossibleBottom(y, maxY) {
return y <= maxY;
}
isImageSlide(index) {
const currentItem = this.core.galleryItems[index];
return this.core.getSlideType(currentItem) === "image";
}
getPossibleSwipeDragCords(scale) {
const $image = this.core.getSlideItem(this.core.index).find(".lg-image").first();
const imgRect = $image.get().getBoundingClientRect();
let imageHeight = imgRect.height;
let imageWidth = imgRect.width;
if (scale) {
imageHeight = imageHeight + scale * imageHeight;
imageWidth = imageWidth + scale * imageWidth;
}
const { bottom } = this.core.mediaContainerPosition;
const minY = (imageHeight - this.containerRect.height) / 2;
const maxY = (this.containerRect.height - imageHeight) / 2 + bottom;
const minX = (imageWidth - this.containerRect.width) / 2;
const maxX = (this.containerRect.width - imageWidth) / 2;
const possibleSwipeCords = {
minY,
maxY,
minX,
maxX
};
return possibleSwipeCords;
}
setZoomSwipeStyles(LGel, distance) {
LGel.css(
"transform",
"translate3d(" + distance.x + "px, " + distance.y + "px, 0)"
);
}
zoomSwipe() {
let startCoords = {};
let endCoords = {};
let isMoved = false;
let allowX = false;
let allowY = false;
let samples = [];
let possibleSwipeCords;
let _LGel;
let $item = this.core.getSlideItem(this.core.index);
this.core.$inner.on("touchstart.lg", (e) => {
if (!this.isImageSlide(this.core.index)) {
return;
}
$item = this.core.getSlideItem(this.core.index);
if ((this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target)) && e.touches.length === 1 && this.core.outer.hasClass("lg-zoomed")) {
e.preventDefault();
this.stopZoomSpring();
isMoved = false;
endCoords = {};
const startPoint = this.getSwipeCords(e);
samples = [{ x: startPoint.x, y: startPoint.y, t: Date.now() }];
this.core.touchAction = "zoomSwipe";
_LGel = this.core.getSlideItem(this.core.index).find(".lg-img-wrap").first();
const dragAllowedAxises = this.getDragAllowedAxises(0);
allowY = dragAllowedAxises.allowY;
allowX = dragAllowedAxises.allowX;
startCoords = this.getSwipeCords(e);
possibleSwipeCords = this.getPossibleSwipeDragCords();
this.core.outer.addClass(
"lg-zoom-dragging lg-zoom-drag-transition"
);
}
});
this.core.$inner.on("touchmove.lg", (e) => {
if (e.touches.length === 1 && this.core.touchAction === "zoomSwipe" && (this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target))) {
e.preventDefault();
this.core.touchAction = "zoomSwipe";
endCoords = this.getSwipeCords(e);
samples = pushVelocitySample(samples, {
x: endCoords.x,
y: endCoords.y,
t: Date.now()
});
const distance = this.getZoomSwipeCords(
startCoords,
endCoords,
allowX,
allowY,
possibleSwipeCords
);
if (Math.abs(endCoords.x - startCoords.x) > 15 || Math.abs(endCoords.y - startCoords.y) > 15) {
isMoved = true;
this.setZoomSwipeStyles(_LGel, distance);
}
}
});
this.core.$inner.on("touchend.lg", (e) => {
if (this.core.touchAction === "zoomSwipe" && (this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target))) {
e.preventDefault();
this.core.touchAction = void 0;
this.core.outer.removeClass("lg-zoom-dragging");
if (!isMoved) {
this.settleIntoBounds();
return;
}
isMoved = false;
this.touchendZoom(
startCoords,
endCoords,
allowX,
allowY,
getWindowedVelocity(samples, Date.now())
);
}
});
}
zoomDrag() {
let startCoords = {};
let endCoords = {};
let isDragging = false;
let isMoved = false;
let allowX = false;
let allowY = false;
let dragSamples = [];
let possibleSwipeCords;
let _LGel;
this.core.outer.on("mousedown.lg.zoom", (e) => {
if (!this.isImageSlide(this.core.index)) {
return;
}
const $item = this.core.getSlideItem(this.core.index);
if (this.$LG(e.target).hasClass("lg-item") || $item.get().contains(e.target)) {
if (this.core.outer.hasClass("lg-zoomed")) {
this.stopZoomSpring();
}
dragSamples = [{ x: e.pageX, y: e.pageY, t: Date.now() }];
_LGel = this.core.getSlideItem(this.core.index).find(".lg-img-wrap").first();
const dragAllowedAxises = this.getDragAllowedAxises(0);
allowY = dragAllowedAxises.allowY;
allowX = dragAllowedAxises.allowX;
if (this.core.outer.hasClass("lg-zoomed")) {
if (this.$LG(e.target).hasClass("lg-object") && (allowX || allowY)) {
e.preventDefault();
startCoords = this.getDragCords(e);
possibleSwipeCords = this.getPossibleSwipeDragCords();
isDragging = true;
this.core.outer.removeClass("lg-grab").addClass(
"lg-grabbing lg-zoom-drag-transition lg-zoom-dragging"
);
}
}
}
});
this.$LG(window).on(
`mousemove.lg.zoom.global${this.core.lgId}`,
(e) => {
if (isDragging) {
isMoved = true;
endCoords = this.getDragCords(e);
dragSamples = pushVelocitySample(dragSamples, {
x: endCoords.x,
y: endCoords.y,
t: Date.now()
});
const distance = this.getZoomSwipeCords(
startCoords,
endCoords,
allowX,
allowY,
possibleSwipeCords
);
this.setZoomSwipeStyles(_LGel, distance);
}
}
);
this.$LG(window).on(`mouseup.lg.zoom.global${this.core.lgId}`, (e) => {
if (isDragging) {
isDragging = false;
this.core.outer.removeClass("lg-zoom-dragging");
if (isMoved && (startCoords.x !== endCoords.x || startCoords.y !== endCoords.y)) {
endCoords = this.getDragCords(e);
this.touchendZoom(
startCoords,
endCoords,
allowX,
allowY,
getWindowedVelocity(dragSamples, Date.now())
);
} else {
this.settleIntoBounds();
}
isMoved = false;
}
this.core.outer.removeClass("lg-grabbing").addClass("lg-grab");
});
}
closeGallery() {
if (this.imageReset) {
this.resetImageTranslate(this.core.index);
}
this.resetZoom();
this.zoomInProgress = false;
}
destroy() {
this.$LG(window).off(`.lg.zoom.global${this.core.lgId}`);
this.core.LGel.off(".lg.zoom");
this.core.LGel.off(".zoom");
clearTimeout(this.zoomableTimeout);
this.zoomableTimeout = false;
}
}
return Zoom;
});
//# sourceMappingURL=lg-zoom.umd.js.map