lightgallery/plugins/zoom/lg-zoom.umd.js

/*!
 * lightgallery | 2.7.1 | January 11th 2023
 * http://www.lightgalleryjs.com/
 * Copyright (c) 2020 Sachin Neravath;
 * @license GPLv3
 */

(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';

    /*! *****************************************************************************
    Copyright (c) Microsoft Corporation.

    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted.

    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
    PERFORMANCE OF THIS SOFTWARE.
    ***************************************************************************** */

    var __assign = function() {
        __assign = Object.assign || function __assign(t) {
            for (var s, i = 1, n = arguments.length; i < n; i++) {
                s = arguments[i];
                for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p)) t[p] = s[p];
            }
            return t;
        };
        return __assign.apply(this, arguments);
    };

    var zoomSettings = {
        scale: 1,
        zoom: true,
        actualSize: true,
        showZoomInOutIcons: false,
        actualSizeIcons: {
            zoomIn: 'lg-zoom-in',
            zoomOut: 'lg-zoom-out',
        },
        enableZoomAfter: 300,
        zoomPluginStrings: {
            zoomIn: 'Zoom in',
            zoomOut: 'Zoom out',
            viewActualSize: 'View actual size',
        },
    };

    /**
     * List of lightGallery events
     * All events should be documented here
     * Below interfaces are used to build the website documentations
     * */
    var lGEvents = {
        afterAppendSlide: 'lgAfterAppendSlide',
        init: 'lgInit',
        hasVideo: 'lgHasVideo',
        containerResize: 'lgContainerResize',
        updateSlides: 'lgUpdateSlides',
        afterAppendSubHtml: 'lgAfterAppendSubHtml',
        beforeOpen: 'lgBeforeOpen',
        afterOpen: 'lgAfterOpen',
        slideItemLoad: 'lgSlideItemLoad',
        beforeSlide: 'lgBeforeSlide',
        afterSlide: 'lgAfterSlide',
        posterClick: 'lgPosterClick',
        dragStart: 'lgDragStart',
        dragMove: 'lgDragMove',
        dragEnd: 'lgDragEnd',
        beforeNextSlide: 'lgBeforeNextSlide',
        beforePrevSlide: 'lgBeforePrevSlide',
        beforeClose: 'lgBeforeClose',
        afterClose: 'lgAfterClose',
        rotateLeft: 'lgRotateLeft',
        rotateRight: 'lgRotateRight',
        flipHorizontal: 'lgFlipHorizontal',
        flipVertical: 'lgFlipVertical',
        autoplay: 'lgAutoplay',
        autoplayStart: 'lgAutoplayStart',
        autoplayStop: 'lgAutoplayStop',
    };

    var ZOOM_TRANSITION_DURATION = 500;
    var Zoom = /** @class */ (function () {
        function Zoom(instance, $LG) {
            // get lightGallery core plugin instance
            this.core = instance;
            this.$LG = $LG;
            this.settings = __assign(__assign({}, zoomSettings), this.core.settings);
            return this;
        }
        // Append Zoom controls. Actual size, Zoom-in, Zoom-out
        Zoom.prototype.buildTemplates = function () {
            var zoomIcons = this.settings.showZoomInOutIcons
                ? "<button id=\"" + this.core.getIdName('lg-zoom-in') + "\" type=\"button\" aria-label=\"" + this.settings.zoomPluginStrings['zoomIn'] + "\" class=\"lg-zoom-in lg-icon\"></button><button id=\"" + this.core.getIdName('lg-zoom-out') + "\" type=\"button\" aria-label=\"" + this.settings.zoomPluginStrings['zoomIn'] + "\" class=\"lg-zoom-out lg-icon\"></button>"
                : '';
            if (this.settings.actualSize) {
                zoomIcons += "<button id=\"" + this.core.getIdName('lg-actual-size') + "\" type=\"button\" aria-label=\"" + this.settings.zoomPluginStrings['viewActualSize'] + "\" class=\"" + this.settings.actualSizeIcons.zoomIn + " lg-icon\"></button>";
            }
            this.core.outer.addClass('lg-use-transition-for-zoom');
            this.core.$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.
         */
        Zoom.prototype.enableZoom = function (event) {
            var _this = this;
            // delay will be 0 except first time
            var _speed = this.settings.enableZoomAfter + event.detail.delay;
            // set _speed value 0 if gallery opened from direct url and if it is first slide
            if (this.$LG('body').first().hasClass('lg-from-hash') &&
                event.detail.delay) {
                // will execute only once
                _speed = 0;
            }
            else {
                // Remove lg-from-hash to enable starting animation.
                this.$LG('body').first().removeClass('lg-from-hash');
            }
            this.zoomableTimeout = setTimeout(function () {
                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);
        };
        Zoom.prototype.enableZoomOnSlideItemLoad = function () {
            // Add zoomable class
            this.core.LGel.on(lGEvents.slideItemLoad + ".zoom", this.enableZoom.bind(this));
        };
        Zoom.prototype.getDragCords = function (e) {
            return {
                x: e.pageX,
                y: e.pageY,
            };
        };
        Zoom.prototype.getSwipeCords = function (e) {
            var x = e.touches[0].pageX;
            var y = e.touches[0].pageY;
            return {
                x: x,
                y: y,
            };
        };
        Zoom.prototype.getDragAllowedAxises = function (scale, scaleDiff) {
            var $image = this.core
                .getSlideItem(this.core.index)
                .find('.lg-image')
                .first()
                .get();
            var height = 0;
            var width = 0;
            var rect = $image.getBoundingClientRect();
            if (scale) {
                height = $image.offsetHeight * scale;
                width = $image.offsetWidth * scale;
            }
            else if (scaleDiff) {
                height = rect.height + scaleDiff * rect.height;
                width = rect.width + scaleDiff * rect.width;
            }
            else {
                height = rect.height;
                width = rect.width;
            }
            var allowY = height > this.containerRect.height;
            var allowX = width > this.containerRect.width;
            return {
                allowX: allowX,
                allowY: allowY,
            };
        };
        Zoom.prototype.setZoomEssentials = function () {
            this.containerRect = this.core.$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
         */
        Zoom.prototype.zoomImage = function (scale, scaleDiff, reposition, resetToMax) {
            if (Math.abs(scaleDiff) <= 0)
                return;
            var offsetX = this.containerRect.width / 2 + this.containerRect.left;
            var offsetY = this.containerRect.height / 2 +
                this.containerRect.top +
                this.scrollTop;
            var originalX;
            var originalY;
            if (scale === 1) {
                this.positionChanged = false;
            }
            var dragAllowedAxises = this.getDragAllowedAxises(0, scaleDiff);
            var allowY = dragAllowedAxises.allowY, allowX = dragAllowedAxises.allowX;
            if (this.positionChanged) {
                originalX = this.left / (this.scale - scaleDiff);
                originalY = this.top / (this.scale - scaleDiff);
                this.pageX = offsetX - originalX;
                this.pageY = offsetY - originalY;
                this.positionChanged = false;
            }
            var possibleSwipeCords = this.getPossibleSwipeDragCords(scaleDiff);
            var x;
            var y;
            var _x = offsetX - this.pageX;
            var _y = offsetY - this.pageY;
            if (scale - scaleDiff > 1) {
                var 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 {
                var scaleVal = (scale - scaleDiff) * scaleDiff;
                x = _x * scaleVal;
                y = _y * scaleVal;
            }
            if (reposition) {
                if (allowX) {
                    if (this.isBeyondPossibleLeft(x, possibleSwipeCords.minX)) {
                        x = possibleSwipeCords.minX;
                    }
                    else if (this.isBeyondPossibleRight(x, possibleSwipeCords.maxX)) {
                        x = possibleSwipeCords.maxX;
                    }
                }
                else {
                    if (scale > 1) {
                        if (x < possibleSwipeCords.minX) {
                            x = possibleSwipeCords.minX;
                        }
                        else if (x > possibleSwipeCords.maxX) {
                            x = possibleSwipeCords.maxX;
                        }
                    }
                }
                // @todo fix this
                if (allowY) {
                    if (this.isBeyondPossibleTop(y, possibleSwipeCords.minY)) {
                        y = possibleSwipeCords.minY;
                    }
                    else if (this.isBeyondPossibleBottom(y, possibleSwipeCords.maxY)) {
                        y = possibleSwipeCords.maxY;
                    }
                }
                else {
                    // If the translate value based on index of beyond the viewport, utilize the available space to prevent image being cut out
                    if (scale > 1) {
                        //If image goes beyond viewport top, use the minim possible translate value
                        if (y < possibleSwipeCords.minY) {
                            y = possibleSwipeCords.minY;
                        }
                        else if (y > possibleSwipeCords.maxY) {
                            y = possibleSwipeCords.maxY;
                        }
                    }
                }
            }
            this.setZoomStyles({
                x: x,
                y: y,
                scale: scale,
            });
            this.left = x;
            this.top = y;
            if (resetToMax) {
                this.setZoomImageSize();
            }
        };
        Zoom.prototype.resetImageTranslate = function (index) {
            if (!this.isImageSlide(index)) {
                return;
            }
            var $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(function () {
                $image.removeClass('no-transition');
            }, 10);
        };
        Zoom.prototype.setZoomImageSize = function () {
            var _this = this;
            var $image = this.core
                .getSlideItem(this.core.index)
                .find('.lg-image')
                .first();
            setTimeout(function () {
                var actualSizeScale = _this.getCurrentImageActualSizeScale();
                if (_this.scale >= actualSizeScale) {
                    $image.addClass('no-transition');
                    _this.imageReset = true;
                }
            }, ZOOM_TRANSITION_DURATION);
            setTimeout(function () {
                var actualSizeScale = _this.getCurrentImageActualSizeScale();
                if (_this.scale >= actualSizeScale) {
                    var dragAllowedAxises = _this.getDragAllowedAxises(_this.scale);
                    $image
                        .css('width', $image.get().naturalWidth + 'px')
                        .css('height', $image.get().naturalHeight + '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');
                    }
                }
            }, ZOOM_TRANSITION_DURATION + 50);
        };
        /**
         * @desc apply scale3d to image and translate to image wrap
         * @param {style} X,Y and scale
         */
        Zoom.prototype.setZoomStyles = function (style) {
            var $imageWrap = this.core
                .getSlideItem(this.core.index)
                .find('.lg-img-wrap')
                .first();
            var $image = this.core
                .getSlideItem(this.core.index)
                .find('.lg-image')
                .first();
            var $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)');
            var 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
         */
        Zoom.prototype.setActualSize = function (index, event) {
            var _this = this;
            var currentItem = this.core.galleryItems[this.core.index];
            this.resetImageTranslate(index);
            setTimeout(function () {
                // Allow zoom only on image
                if (!currentItem.src ||
                    _this.core.outer.hasClass('lg-first-slide-loading')) {
                    return;
                }
                var scale = _this.getCurrentImageActualSizeScale();
                var 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);
                setTimeout(function () {
                    _this.core.outer.removeClass('lg-grabbing').addClass('lg-grab');
                }, 10);
            }, 50);
        };
        Zoom.prototype.getNaturalWidth = function (index) {
            var $image = this.core.getSlideItem(index).find('.lg-image').first();
            var naturalWidth = this.core.galleryItems[index].width;
            return naturalWidth
                ? parseFloat(naturalWidth)
                : $image.get().naturalWidth;
        };
        Zoom.prototype.getActualSizeScale = function (naturalWidth, width) {
            var _scale;
            var scale;
            if (naturalWidth >= width) {
                _scale = naturalWidth / width;
                scale = _scale || 2;
            }
            else {
                scale = 1;
            }
            return scale;
        };
        Zoom.prototype.getCurrentImageActualSizeScale = function () {
            var $image = this.core
                .getSlideItem(this.core.index)
                .find('.lg-image')
                .first();
            var width = $image.get().offsetWidth;
            var naturalWidth = this.getNaturalWidth(this.core.index) || width;
            return this.getActualSizeScale(naturalWidth, width);
        };
        Zoom.prototype.getPageCords = function (event) {
            var cords = {};
            if (event) {
                cords.x = event.pageX || event.touches[0].pageX;
                cords.y = event.pageY || event.touches[0].pageY;
            }
            else {
                var containerRect = this.core.$content
                    .get()
                    .getBoundingClientRect();
                cords.x = containerRect.width / 2 + containerRect.left;
                cords.y =
                    containerRect.height / 2 + this.scrollTop + containerRect.top;
            }
            return cords;
        };
        Zoom.prototype.setPageCords = function (event) {
            var pageCords = this.getPageCords(event);
            this.pageX = pageCords.x;
            this.pageY = pageCords.y;
        };
        Zoom.prototype.manageActualPixelClassNames = function () {
            var $actualSize = this.core.getElementById('lg-actual-size');
            $actualSize
                .removeClass(this.settings.actualSizeIcons.zoomIn)
                .addClass(this.settings.actualSizeIcons.zoomOut);
        };
        // If true, zoomed - in else zoomed out
        Zoom.prototype.beginZoom = function (scale) {
            this.core.outer.removeClass('lg-zoom-drag-transition lg-zoom-dragging');
            if (scale > 1) {
                this.core.outer.addClass('lg-zoomed');
                this.manageActualPixelClassNames();
            }
            else {
                this.resetZoom();
            }
            return scale > 1;
        };
        Zoom.prototype.getScale = function (scale) {
            var actualSizeScale = this.getCurrentImageActualSizeScale();
            if (scale < 1) {
                scale = 1;
            }
            else if (scale > actualSizeScale) {
                scale = actualSizeScale;
            }
            return scale;
        };
        Zoom.prototype.init = function () {
            var _this = this;
            if (!this.settings.zoom) {
                return;
            }
            this.buildTemplates();
            this.enableZoomOnSlideItemLoad();
            var tapped = null;
            this.core.outer.on('dblclick.lg', function (event) {
                if (!_this.$LG(event.target).hasClass('lg-image')) {
                    return;
                }
                _this.setActualSize(_this.core.index, event);
            });
            this.core.outer.on('touchstart.lg', function (event) {
                var $target = _this.$LG(event.target);
                if (event.touches.length === 1 && $target.hasClass('lg-image')) {
                    if (!tapped) {
                        tapped = setTimeout(function () {
                            tapped = null;
                        }, 300);
                    }
                    else {
                        clearTimeout(tapped);
                        tapped = null;
                        event.preventDefault();
                        _this.setActualSize(_this.core.index, event);
                    }
                }
            });
            this.core.LGel.on(lGEvents.containerResize + ".zoom " + lGEvents.rotateRight + ".zoom " + lGEvents.rotateLeft + ".zoom " + lGEvents.flipHorizontal + ".zoom " + lGEvents.flipVertical + ".zoom", function () {
                if (!_this.core.lgOpened ||
                    !_this.isImageSlide(_this.core.index) ||
                    _this.core.touchAction) {
                    return;
                }
                var _LGel = _this.core
                    .getSlideItem(_this.core.index)
                    .find('.lg-img-wrap')
                    .first();
                _this.top = 0;
                _this.left = 0;
                _this.setZoomEssentials();
                _this.setZoomSwipeStyles(_LGel, { x: 0, y: 0 });
                _this.positionChanged = true;
            });
            // Update zoom on resize and orientationchange
            this.$LG(window).on("scroll.lg.zoom.global" + this.core.lgId, function () {
                if (!_this.core.lgOpened)
                    return;
                _this.scrollTop = _this.$LG(window).scrollTop();
            });
            this.core.getElementById('lg-zoom-out').on('click.lg', function () {
                // Allow zoom only on image
                if (!_this.isImageSlide(_this.core.index)) {
                    return;
                }
                var timeout = 0;
                if (_this.imageReset) {
                    _this.resetImageTranslate(_this.core.index);
                    timeout = 50;
                }
                setTimeout(function () {
                    var scale = _this.scale - _this.settings.scale;
                    if (scale < 1) {
                        scale = 1;
                    }
                    _this.beginZoom(scale);
                    _this.zoomImage(scale, -_this.settings.scale, true, true);
                }, timeout);
            });
            this.core.getElementById('lg-zoom-in').on('click.lg', function () {
                _this.zoomIn();
            });
            this.core.getElementById('lg-actual-size').on('click.lg', function () {
                _this.setActualSize(_this.core.index);
            });
            this.core.LGel.on(lGEvents.beforeOpen + ".zoom", function () {
                _this.core.outer.find('.lg-item').removeClass('lg-zoomable');
            });
            this.core.LGel.on(lGEvents.afterOpen + ".zoom", function () {
                _this.scrollTop = _this.$LG(window).scrollTop();
                // Set the initial value center
                _this.pageX = _this.core.outer.width() / 2;
                _this.pageY = _this.core.outer.height() / 2 + _this.scrollTop;
                _this.scale = 1;
            });
            // Reset zoom on slide change
            this.core.LGel.on(lGEvents.afterSlide + ".zoom", function (event) {
                var prevIndex = event.detail.prevIndex;
                _this.scale = 1;
                _this.positionChanged = false;
                _this.resetZoom(prevIndex);
                _this.resetImageTranslate(prevIndex);
                if (_this.isImageSlide(_this.core.index)) {
                    _this.setZoomEssentials();
                }
            });
            // Drag option after zoom
            this.zoomDrag();
            this.pinchZoom();
            this.zoomSwipe();
            // Store the zoomable timeout value just to clear it while closing
            this.zoomableTimeout = false;
            this.positionChanged = false;
        };
        Zoom.prototype.zoomIn = function () {
            // Allow zoom only on image
            if (!this.isImageSlide(this.core.index)) {
                return;
            }
            var scale = this.scale + this.settings.scale;
            scale = this.getScale(scale);
            this.beginZoom(scale);
            this.zoomImage(scale, Math.min(this.settings.scale, scale - this.scale), true, true);
        };
        // Reset zoom effect
        Zoom.prototype.resetZoom = function (index) {
            this.core.outer.removeClass('lg-zoomed lg-zoom-drag-transition');
            var $actualSize = this.core.getElementById('lg-actual-size');
            var $item = this.core.getSlideItem(index !== undefined ? 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;
            // Reset pagx pagy values to center
            this.setPageCords();
        };
        Zoom.prototype.getTouchDistance = function (e) {
            return Math.sqrt((e.touches[0].pageX - e.touches[1].pageX) *
                (e.touches[0].pageX - e.touches[1].pageX) +
                (e.touches[0].pageY - e.touches[1].pageY) *
                    (e.touches[0].pageY - e.touches[1].pageY));
        };
        Zoom.prototype.pinchZoom = function () {
            var _this = this;
            var startDist = 0;
            var pinchStarted = false;
            var initScale = 1;
            var prevScale = 0;
            var $item = this.core.getSlideItem(this.core.index);
            this.core.outer.on('touchstart.lg', function (e) {
                $item = _this.core.getSlideItem(_this.core.index);
                if (!_this.isImageSlide(_this.core.index)) {
                    return;
                }
                if (e.touches.length === 2) {
                    e.preventDefault();
                    if (_this.core.outer.hasClass('lg-first-slide-loading')) {
                        return;
                    }
                    initScale = _this.scale || 1;
                    _this.core.outer.removeClass('lg-zoom-drag-transition lg-zoom-dragging');
                    _this.setPageCords(e);
                    _this.resetImageTranslate(_this.core.index);
                    _this.core.touchAction = 'pinch';
                    startDist = _this.getTouchDistance(e);
                }
            });
            this.core.$inner.on('touchmove.lg', function (e) {
                if (e.touches.length === 2 &&
                    _this.core.touchAction === 'pinch' &&
                    (_this.$LG(e.target).hasClass('lg-item') ||
                        $item.get().contains(e.target))) {
                    e.preventDefault();
                    var endDist = _this.getTouchDistance(e);
                    var distance = startDist - endDist;
                    if (!pinchStarted && Math.abs(distance) > 5) {
                        pinchStarted = true;
                    }
                    if (pinchStarted) {
                        prevScale = _this.scale;
                        var _scale = Math.max(1, initScale + -distance * 0.02);
                        _this.scale =
                            Math.round((_scale + Number.EPSILON) * 100) / 100;
                        var diff = _this.scale - prevScale;
                        _this.zoomImage(_this.scale, Math.round((diff + Number.EPSILON) * 100) / 100, false, false);
                    }
                }
            });
            this.core.$inner.on('touchend.lg', function (e) {
                if (_this.core.touchAction === 'pinch' &&
                    (_this.$LG(e.target).hasClass('lg-item') ||
                        $item.get().contains(e.target))) {
                    pinchStarted = false;
                    startDist = 0;
                    if (_this.scale <= 1) {
                        _this.resetZoom();
                    }
                    else {
                        var actualSizeScale = _this.getCurrentImageActualSizeScale();
                        if (_this.scale >= actualSizeScale) {
                            var scaleDiff = actualSizeScale - _this.scale;
                            if (scaleDiff === 0) {
                                scaleDiff = 0.01;
                            }
                            _this.zoomImage(actualSizeScale, scaleDiff, false, true);
                        }
                        _this.manageActualPixelClassNames();
                        _this.core.outer.addClass('lg-zoomed');
                    }
                    _this.core.touchAction = undefined;
                }
            });
        };
        Zoom.prototype.touchendZoom = function (startCoords, endCoords, allowX, allowY, touchDuration) {
            var distanceXnew = endCoords.x - startCoords.x;
            var distanceYnew = endCoords.y - startCoords.y;
            var speedX = Math.abs(distanceXnew) / touchDuration + 1;
            var speedY = Math.abs(distanceYnew) / touchDuration + 1;
            if (speedX > 2) {
                speedX += 1;
            }
            if (speedY > 2) {
                speedY += 1;
            }
            distanceXnew = distanceXnew * speedX;
            distanceYnew = distanceYnew * speedY;
            var _LGel = this.core
                .getSlideItem(this.core.index)
                .find('.lg-img-wrap')
                .first();
            var distance = {};
            distance.x = this.left + distanceXnew;
            distance.y = this.top + distanceYnew;
            var possibleSwipeCords = this.getPossibleSwipeDragCords();
            if (Math.abs(distanceXnew) > 15 || Math.abs(distanceYnew) > 15) {
                if (allowY) {
                    if (this.isBeyondPossibleTop(distance.y, possibleSwipeCords.minY)) {
                        distance.y = possibleSwipeCords.minY;
                    }
                    else if (this.isBeyondPossibleBottom(distance.y, possibleSwipeCords.maxY)) {
                        distance.y = possibleSwipeCords.maxY;
                    }
                }
                if (allowX) {
                    if (this.isBeyondPossibleLeft(distance.x, possibleSwipeCords.minX)) {
                        distance.x = possibleSwipeCords.minX;
                    }
                    else if (this.isBeyondPossibleRight(distance.x, possibleSwipeCords.maxX)) {
                        distance.x = possibleSwipeCords.maxX;
                    }
                }
                if (allowY) {
                    this.top = distance.y;
                }
                else {
                    distance.y = this.top;
                }
                if (allowX) {
                    this.left = distance.x;
                }
                else {
                    distance.x = this.left;
                }
                this.setZoomSwipeStyles(_LGel, distance);
                this.positionChanged = true;
            }
        };
        Zoom.prototype.getZoomSwipeCords = function (startCoords, endCoords, allowX, allowY, possibleSwipeCords) {
            var distance = {};
            if (allowY) {
                distance.y = this.top + (endCoords.y - startCoords.y);
                if (this.isBeyondPossibleTop(distance.y, possibleSwipeCords.minY)) {
                    var diffMinY = possibleSwipeCords.minY - distance.y;
                    distance.y = possibleSwipeCords.minY - diffMinY / 6;
                }
                else if (this.isBeyondPossibleBottom(distance.y, possibleSwipeCords.maxY)) {
                    var 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)) {
                    var diffMinX = possibleSwipeCords.minX - distance.x;
                    distance.x = possibleSwipeCords.minX - diffMinX / 6;
                }
                else if (this.isBeyondPossibleRight(distance.x, possibleSwipeCords.maxX)) {
                    var difMaxX = distance.x - possibleSwipeCords.maxX;
                    distance.x = possibleSwipeCords.maxX + difMaxX / 6;
                }
            }
            else {
                distance.x = this.left;
            }
            return distance;
        };
        Zoom.prototype.isBeyondPossibleLeft = function (x, minX) {
            return x >= minX;
        };
        Zoom.prototype.isBeyondPossibleRight = function (x, maxX) {
            return x <= maxX;
        };
        Zoom.prototype.isBeyondPossibleTop = function (y, minY) {
            return y >= minY;
        };
        Zoom.prototype.isBeyondPossibleBottom = function (y, maxY) {
            return y <= maxY;
        };
        Zoom.prototype.isImageSlide = function (index) {
            var currentItem = this.core.galleryItems[index];
            return this.core.getSlideType(currentItem) === 'image';
        };
        Zoom.prototype.getPossibleSwipeDragCords = function (scale) {
            var $image = this.core
                .getSlideItem(this.core.index)
                .find('.lg-image')
                .first();
            var bottom = this.core.mediaContainerPosition.bottom;
            var imgRect = $image.get().getBoundingClientRect();
            var imageHeight = imgRect.height;
            var imageWidth = imgRect.width;
            if (scale) {
                imageHeight = imageHeight + scale * imageHeight;
                imageWidth = imageWidth + scale * imageWidth;
            }
            var minY = (imageHeight - this.containerRect.height) / 2;
            var maxY = (this.containerRect.height - imageHeight) / 2 + bottom;
            var minX = (imageWidth - this.containerRect.width) / 2;
            var maxX = (this.containerRect.width - imageWidth) / 2;
            var possibleSwipeCords = {
                minY: minY,
                maxY: maxY,
                minX: minX,
                maxX: maxX,
            };
            return possibleSwipeCords;
        };
        Zoom.prototype.setZoomSwipeStyles = function (LGel, distance) {
            LGel.css('transform', 'translate3d(' + distance.x + 'px, ' + distance.y + 'px, 0)');
        };
        Zoom.prototype.zoomSwipe = function () {
            var _this = this;
            var startCoords = {};
            var endCoords = {};
            var isMoved = false;
            // Allow x direction drag
            var allowX = false;
            // Allow Y direction drag
            var allowY = false;
            var startTime = new Date();
            var endTime = new Date();
            var possibleSwipeCords;
            var _LGel;
            var $item = this.core.getSlideItem(this.core.index);
            this.core.$inner.on('touchstart.lg', function (e) {
                // Allow zoom only on image
                if (!_this.isImageSlide(_this.core.index)) {
                    return;
                }
                $item = _this.core.getSlideItem(_this.core.index);
                if ((_this.$LG(e.target).hasClass('lg-item') ||
                    $item.get().contains(e.target)) &&
                    e.touches.length === 1 &&
                    _this.core.outer.hasClass('lg-zoomed')) {
                    e.preventDefault();
                    startTime = new Date();
                    _this.core.touchAction = 'zoomSwipe';
                    _LGel = _this.core
                        .getSlideItem(_this.core.index)
                        .find('.lg-img-wrap')
                        .first();
                    var dragAllowedAxises = _this.getDragAllowedAxises(0);
                    allowY = dragAllowedAxises.allowY;
                    allowX = dragAllowedAxises.allowX;
                    if (allowX || allowY) {
                        startCoords = _this.getSwipeCords(e);
                    }
                    possibleSwipeCords = _this.getPossibleSwipeDragCords();
                    // reset opacity and transition duration
                    _this.core.outer.addClass('lg-zoom-dragging lg-zoom-drag-transition');
                }
            });
            this.core.$inner.on('touchmove.lg', function (e) {
                if (e.touches.length === 1 &&
                    _this.core.touchAction === 'zoomSwipe' &&
                    (_this.$LG(e.target).hasClass('lg-item') ||
                        $item.get().contains(e.target))) {
                    e.preventDefault();
                    _this.core.touchAction = 'zoomSwipe';
                    endCoords = _this.getSwipeCords(e);
                    var distance = _this.getZoomSwipeCords(startCoords, endCoords, allowX, allowY, possibleSwipeCords);
                    if (Math.abs(endCoords.x - startCoords.x) > 15 ||
                        Math.abs(endCoords.y - startCoords.y) > 15) {
                        isMoved = true;
                        _this.setZoomSwipeStyles(_LGel, distance);
                    }
                }
            });
            this.core.$inner.on('touchend.lg', function (e) {
                if (_this.core.touchAction === 'zoomSwipe' &&
                    (_this.$LG(e.target).hasClass('lg-item') ||
                        $item.get().contains(e.target))) {
                    e.preventDefault();
                    _this.core.touchAction = undefined;
                    _this.core.outer.removeClass('lg-zoom-dragging');
                    if (!isMoved) {
                        return;
                    }
                    isMoved = false;
                    endTime = new Date();
                    var touchDuration = endTime.valueOf() - startTime.valueOf();
                    _this.touchendZoom(startCoords, endCoords, allowX, allowY, touchDuration);
                }
            });
        };
        Zoom.prototype.zoomDrag = function () {
            var _this = this;
            var startCoords = {};
            var endCoords = {};
            var isDragging = false;
            var isMoved = false;
            // Allow x direction drag
            var allowX = false;
            // Allow Y direction drag
            var allowY = false;
            var startTime;
            var endTime;
            var possibleSwipeCords;
            var _LGel;
            this.core.outer.on('mousedown.lg.zoom', function (e) {
                // Allow zoom only on image
                if (!_this.isImageSlide(_this.core.index)) {
                    return;
                }
                var $item = _this.core.getSlideItem(_this.core.index);
                if (_this.$LG(e.target).hasClass('lg-item') ||
                    $item.get().contains(e.target)) {
                    startTime = new Date();
                    _LGel = _this.core
                        .getSlideItem(_this.core.index)
                        .find('.lg-img-wrap')
                        .first();
                    var dragAllowedAxises = _this.getDragAllowedAxises(0);
                    allowY = dragAllowedAxises.allowY;
                    allowX = dragAllowedAxises.allowX;
                    if (_this.core.outer.hasClass('lg-zoomed')) {
                        if (_this.$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');
                            // reset opacity and transition duration
                        }
                    }
                }
            });
            this.$LG(window).on("mousemove.lg.zoom.global" + this.core.lgId, function (e) {
                if (isDragging) {
                    isMoved = true;
                    endCoords = _this.getDragCords(e);
                    var distance = _this.getZoomSwipeCords(startCoords, endCoords, allowX, allowY, possibleSwipeCords);
                    _this.setZoomSwipeStyles(_LGel, distance);
                }
            });
            this.$LG(window).on("mouseup.lg.zoom.global" + this.core.lgId, function (e) {
                if (isDragging) {
                    endTime = new Date();
                    isDragging = false;
                    _this.core.outer.removeClass('lg-zoom-dragging');
                    // Fix for chrome mouse move on click
                    if (isMoved &&
                        (startCoords.x !== endCoords.x ||
                            startCoords.y !== endCoords.y)) {
                        endCoords = _this.getDragCords(e);
                        var touchDuration = endTime.valueOf() - startTime.valueOf();
                        _this.touchendZoom(startCoords, endCoords, allowX, allowY, touchDuration);
                    }
                    isMoved = false;
                }
                _this.core.outer.removeClass('lg-grabbing').addClass('lg-grab');
            });
        };
        Zoom.prototype.closeGallery = function () {
            this.resetZoom();
        };
        Zoom.prototype.destroy = function () {
            // Unbind all events added by lightGallery zoom plugin
            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;
    }());

    return Zoom;

})));
//# sourceMappingURL=lg-zoom.umd.js.map