677 lines
23 KiB
JavaScript
677 lines
23 KiB
JavaScript
/*! lg-zoom - v1.3.0-beta.0 - October-05-2020
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* http://sachinchoolur.github.io/lightGallery
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* Copyright (c) 2020 Sachin N; Licensed GPLv3 */
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module unless amdModuleId is set
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define(['jquery'], function (a0) {
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return (factory(a0));
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});
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} else if (typeof module === 'object' && module.exports) {
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// Node. Does not work with strict CommonJS, but
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// only CommonJS-like environments that support module.exports,
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// like Node.
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module.exports = factory(require('jquery'));
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} else {
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factory(root["jQuery"]);
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}
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}(this, function ($) {
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(function() {
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'use strict';
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var getUseLeft = function() {
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var useLeft = false;
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var isChrome = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
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if (isChrome && parseInt(isChrome[2], 10) < 54) {
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useLeft = true;
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}
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return useLeft;
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};
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var defaults = {
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scale: 1,
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zoom: true,
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actualSize: true,
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enableZoomAfter: 300,
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useLeftForZoom: getUseLeft()
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};
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var Zoom = function(element) {
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this.core = $(element).data('lightGallery');
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this.core.s = $.extend({}, defaults, this.core.s);
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if (this.core.s.zoom && this.core.doCss()) {
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this.init();
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// Store the zoomable timeout value just to clear it while closing
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this.zoomabletimeout = false;
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// Set the initial value center
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this.pageX = $(window).width() / 2;
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this.pageY = ($(window).height() / 2) + $(window).scrollTop();
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}
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return this;
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};
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Zoom.prototype.init = function() {
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var _this = this;
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var zoomIcons = '<button type="button" aria-label="Zoom in" id="lg-zoom-in" class="lg-icon"></button><button type="button" aria-label="Zoom out" id="lg-zoom-out" class="lg-icon"></button>';
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if (_this.core.s.actualSize) {
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zoomIcons += '<button type="button" aria-label="Actual size" id="lg-actual-size" class="lg-icon"></button>';
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}
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if (_this.core.s.useLeftForZoom) {
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_this.core.$outer.addClass('lg-use-left-for-zoom');
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} else {
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_this.core.$outer.addClass('lg-use-transition-for-zoom');
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}
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this.core.$outer.find('.lg-toolbar').append(zoomIcons);
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// Add zoomable class
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_this.core.$el.on('onSlideItemLoad.lg.tm.zoom', function(event, index, delay) {
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// delay will be 0 except first time
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var _speed = _this.core.s.enableZoomAfter + delay;
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// set _speed value 0 if gallery opened from direct url and if it is first slide
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if ($('body').hasClass('lg-from-hash') && delay) {
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// will execute only once
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_speed = 0;
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} else {
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// Remove lg-from-hash to enable starting animation.
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$('body').removeClass('lg-from-hash');
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}
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_this.zoomabletimeout = setTimeout(function() {
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_this.core.$slide.eq(index).addClass('lg-zoomable');
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}, _speed + 30);
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});
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var scale = 1;
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/**
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* @desc Image zoom
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* Translate the wrap and scale the image to get better user experience
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*
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* @param {String} scaleVal - Zoom decrement/increment value
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*/
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var zoom = function(scaleVal) {
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var $image = _this.core.$outer.find('.lg-current .lg-image');
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var _x;
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var _y;
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// Find offset manually to avoid issue after zoom
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var offsetX = ($(window).width() - $image.prop('offsetWidth')) / 2;
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var offsetY = (($(window).height() - $image.prop('offsetHeight')) / 2) + $(window).scrollTop();
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_x = _this.pageX - offsetX;
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_y = _this.pageY - offsetY;
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var x = (scaleVal - 1) * (_x);
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var y = (scaleVal - 1) * (_y);
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$image.css('transform', 'scale3d(' + scaleVal + ', ' + scaleVal + ', 1)').attr('data-scale', scaleVal);
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if (_this.core.s.useLeftForZoom) {
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$image.parent().css({
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left: -x + 'px',
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top: -y + 'px'
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}).attr('data-x', x).attr('data-y', y);
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} else {
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$image.parent().css('transform', 'translate3d(-' + x + 'px, -' + y + 'px, 0)').attr('data-x', x).attr('data-y', y);
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}
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};
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var callScale = function() {
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if (scale > 1) {
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_this.core.$outer.addClass('lg-zoomed');
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} else {
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_this.resetZoom();
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}
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if (scale < 1) {
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scale = 1;
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}
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zoom(scale);
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};
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var actualSize = function(event, $image, index, fromIcon) {
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var w = $image.prop('offsetWidth');
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var nw;
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if (_this.core.s.dynamic) {
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nw = _this.core.s.dynamicEl[index].width || $image[0].naturalWidth || w;
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} else {
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nw = _this.core.$items.eq(index).attr('data-width') || $image[0].naturalWidth || w;
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}
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var _scale;
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if (_this.core.$outer.hasClass('lg-zoomed')) {
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scale = 1;
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} else {
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if (nw > w) {
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_scale = nw / w;
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scale = _scale || 2;
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}
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}
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if (fromIcon) {
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_this.pageX = $(window).width() / 2;
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_this.pageY = ($(window).height() / 2) + $(window).scrollTop();
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} else {
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_this.pageX = event.pageX || event.originalEvent.targetTouches[0].pageX;
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_this.pageY = event.pageY || event.originalEvent.targetTouches[0].pageY;
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}
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callScale();
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setTimeout(function() {
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_this.core.$outer.removeClass('lg-grabbing').addClass('lg-grab');
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}, 10);
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};
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var tapped = false;
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// event triggered after appending slide content
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_this.core.$el.on('onAferAppendSlide.lg.tm.zoom', function(event, index) {
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// Get the current element
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var $image = _this.core.$slide.eq(index).find('.lg-image');
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$image.on('dblclick', function(event) {
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actualSize(event, $image, index);
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});
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$image.on('touchstart', function(event) {
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if (!tapped) {
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tapped = setTimeout(function() {
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tapped = null;
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}, 300);
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} else {
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clearTimeout(tapped);
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tapped = null;
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actualSize(event, $image, index);
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}
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event.preventDefault();
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});
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});
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// Update zoom on resize and orientationchange
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$(window).on('resize.lg.zoom scroll.lg.zoom orientationchange.lg.zoom', function() {
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_this.pageX = $(window).width() / 2;
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_this.pageY = ($(window).height() / 2) + $(window).scrollTop();
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zoom(scale);
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});
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$('#lg-zoom-out').on('click.lg', function() {
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if (_this.core.$outer.find('.lg-current .lg-image').length) {
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scale -= _this.core.s.scale;
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callScale();
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}
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});
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$('#lg-zoom-in').on('click.lg', function() {
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if (_this.core.$outer.find('.lg-current .lg-image').length) {
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scale += _this.core.s.scale;
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callScale();
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}
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});
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$('#lg-actual-size').on('click.lg', function(event) {
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actualSize(event, _this.core.$slide.eq(_this.core.index).find('.lg-image'), _this.core.index, true);
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});
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// Reset zoom on slide change
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_this.core.$el.on('onBeforeSlide.lg.tm', function() {
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scale = 1;
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_this.resetZoom();
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});
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// Drag option after zoom
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_this.zoomDrag();
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_this.zoomSwipe();
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};
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/**
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*
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* @param {Element} el
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* @return matrix(cos(X), sin(X), -sin(X), cos(X), 0, 0);
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* Get the current transform value
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*/
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Zoom.prototype.getCurrentTransform = function (el) {
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if (!el) {
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return 0;
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}
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var st = window.getComputedStyle(el, null);
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var tm = st.getPropertyValue('-webkit-transform') ||
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st.getPropertyValue('-moz-transform') ||
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st.getPropertyValue('-ms-transform') ||
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st.getPropertyValue('-o-transform') ||
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st.getPropertyValue('transform') ||
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'none';
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if (tm !== 'none') {
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return tm.split('(')[1].split(')')[0].split(',');
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}
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return 0;
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};
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Zoom.prototype.getCurrentRotation = function (el) {
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if (!el) {
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return 0;
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}
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var values = this.getCurrentTransform(el);
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if (values) {
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return Math.round(Math.atan2(values[1], values[0]) * (180 / Math.PI));
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// If you want rotate in 360
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//return (angle < 0 ? angle + 360 : angle);
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}
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return 0;
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};
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Zoom.prototype.getModifier = function (rotateValue, axis, el) {
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var originalRotate = rotateValue;
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rotateValue = Math.abs(rotateValue);
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var transformValues = this.getCurrentTransform(el);
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if (!transformValues) {
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return 1;
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}
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var modifier = 1;
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if (axis === 'X') {
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var flipHorizontalValue = Math.sign(parseFloat(transformValues[0]));
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if (rotateValue === 0 || rotateValue === 180) {
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modifier = 1;
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} else if (rotateValue === 90) {
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if ((originalRotate === -90 && flipHorizontalValue === 1) || (originalRotate === 90 && flipHorizontalValue === -1)) {
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modifier = -1;
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} else {
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modifier = 1;
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}
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}
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modifier = modifier * flipHorizontalValue;
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} else {
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var flipVerticalValue = Math.sign(parseFloat(transformValues[3]));
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if (rotateValue === 0 || rotateValue === 180) {
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modifier = 1;
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} else if (rotateValue === 90) {
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var sinX = parseFloat(transformValues[1]);
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var sinMinusX = parseFloat(transformValues[2]);
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modifier = Math.sign(sinX * sinMinusX * originalRotate * flipVerticalValue);
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}
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modifier = modifier * flipVerticalValue;
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}
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return modifier;
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};
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Zoom.prototype.getImageSize = function ($image, rotateValue, axis) {
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var imageSizes = {
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y: 'offsetHeight',
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x: 'offsetWidth'
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};
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if (rotateValue === 90) {
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// Swap axis
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if (axis === 'x') {
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axis = 'y';
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} else {
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axis = 'x';
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}
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}
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return $image.prop(imageSizes[axis]);
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};
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Zoom.prototype.getDragCords = function (e, rotateValue) {
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if (rotateValue === 90) {
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return {
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x: e.pageY,
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y: e.pageX
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};
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} else {
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return {
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x: e.pageX,
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y: e.pageY
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};
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}
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};
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Zoom.prototype.getSwipeCords = function (e, rotateValue) {
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var x = e.originalEvent.targetTouches[0].pageX;
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var y = e.originalEvent.targetTouches[0].pageY;
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if (rotateValue === 90) {
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return {
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x: y,
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y: x
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};
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} else {
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return {
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x: x,
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y: y
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};
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}
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};
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Zoom.prototype.getPossibleDragCords = function ($image, rotateValue) {
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var minY = (this.core.$outer.find('.lg').height() - this.getImageSize($image, rotateValue, 'y')) / 2;
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var maxY = Math.abs((this.getImageSize($image, rotateValue, 'y') * Math.abs($image.attr('data-scale'))) - this.core.$outer.find('.lg').height() + minY);
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var minX = (this.core.$outer.find('.lg').width() - this.getImageSize($image, rotateValue, 'x')) / 2;
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var maxX = Math.abs((this.getImageSize($image, rotateValue, 'x') * Math.abs($image.attr('data-scale'))) - this.core.$outer.find('.lg').width() + minX);
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if (rotateValue === 90) {
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return {
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minY: minX,
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maxY: maxX,
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minX: minY,
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maxX: maxY,
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};
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} else {
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return {
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minY: minY,
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maxY: maxY,
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minX: minX,
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maxX: maxX,
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};
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}
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};
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Zoom.prototype.getDragAllowedAxises = function ($image, rotateValue) {
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var allowY = this.getImageSize($image, rotateValue, 'y') * $image.attr('data-scale') > this.core.$outer.find('.lg').height();
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var allowX = this.getImageSize($image, rotateValue, 'x') * $image.attr('data-scale') > this.core.$outer.find('.lg').width();
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if (rotateValue === 90) {
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return {
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allowX: allowY,
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allowY: allowX
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};
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} else {
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return {
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allowX: allowX,
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allowY: allowY
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};
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}
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};
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// Reset zoom effect
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Zoom.prototype.resetZoom = function() {
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this.core.$outer.removeClass('lg-zoomed');
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this.core.$slide.find('.lg-img-wrap').removeAttr('style data-x data-y');
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this.core.$slide.find('.lg-image').removeAttr('style data-scale');
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// Reset pagx pagy values to center
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this.pageX = $(window).width() / 2;
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this.pageY = ($(window).height() / 2) + $(window).scrollTop();
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};
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Zoom.prototype.zoomSwipe = function() {
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var _this = this;
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var startCoords = {};
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var endCoords = {};
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var isMoved = false;
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// Allow x direction drag
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var allowX = false;
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// Allow Y direction drag
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var allowY = false;
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var rotateValue = 0;
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var rotateEl;
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_this.core.$slide.on('touchstart.lg', function(e) {
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if (_this.core.$outer.hasClass('lg-zoomed')) {
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var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
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rotateEl = _this.core.$slide.eq(_this.core.index).find('.lg-img-rotate')[0];
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rotateValue = _this.getCurrentRotation(rotateEl);
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var dragAllowedAxises = _this.getDragAllowedAxises($image, Math.abs(rotateValue));
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allowY = dragAllowedAxises.allowY;
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allowX = dragAllowedAxises.allowX;
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if ((allowX || allowY)) {
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e.preventDefault();
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startCoords = _this.getSwipeCords(e, Math.abs(rotateValue));
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}
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}
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});
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_this.core.$slide.on('touchmove.lg', function(e) {
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if (_this.core.$outer.hasClass('lg-zoomed')) {
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var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
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var distanceX;
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var distanceY;
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e.preventDefault();
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isMoved = true;
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endCoords = _this.getSwipeCords(e, Math.abs(rotateValue));
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// reset opacity and transition duration
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_this.core.$outer.addClass('lg-zoom-dragging');
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if (allowY) {
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distanceY = (-Math.abs(_$el.attr('data-y'))) + ((endCoords.y - startCoords.y) * _this.getModifier(rotateValue, 'Y', rotateEl));
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} else {
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distanceY = -Math.abs(_$el.attr('data-y'));
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}
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if (allowX) {
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distanceX = (-Math.abs(_$el.attr('data-x'))) + ((endCoords.x - startCoords.x) * _this.getModifier(rotateValue, 'X', rotateEl));
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} else {
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distanceX = -Math.abs(_$el.attr('data-x'));
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}
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if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
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if (_this.core.s.useLeftForZoom) {
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_$el.css({
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left: distanceX + 'px',
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top: distanceY + 'px'
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});
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} else {
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_$el.css('transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
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}
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}
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}
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});
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_this.core.$slide.on('touchend.lg', function() {
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if (_this.core.$outer.hasClass('lg-zoomed')) {
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if (isMoved) {
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isMoved = false;
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_this.core.$outer.removeClass('lg-zoom-dragging');
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_this.touchendZoom(startCoords, endCoords, allowX, allowY, rotateValue);
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}
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}
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});
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};
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Zoom.prototype.zoomDrag = function() {
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var _this = this;
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var startCoords = {};
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var endCoords = {};
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var isDraging = false;
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var isMoved = false;
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// Allow x direction drag
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var allowX = false;
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// Allow Y direction drag
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var allowY = false;
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var rotateValue = 0;
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var rotateEl;
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_this.core.$slide.on('mousedown.lg.zoom', function(e) {
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rotateEl = _this.core.$slide.eq(_this.core.index).find('.lg-img-rotate')[0];
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rotateValue = _this.getCurrentRotation(rotateEl);
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// execute only on .lg-object
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var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
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var dragAllowedAxises = _this.getDragAllowedAxises($image, Math.abs(rotateValue));
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allowY = dragAllowedAxises.allowY;
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allowX = dragAllowedAxises.allowX;
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|
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if (_this.core.$outer.hasClass('lg-zoomed')) {
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if ($(e.target).hasClass('lg-object') && (allowX || allowY)) {
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e.preventDefault();
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startCoords = _this.getDragCords(e, Math.abs(rotateValue));
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|
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isDraging = true;
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|
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// ** Fix for webkit cursor issue https://code.google.com/p/chromium/issues/detail?id=26723
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_this.core.$outer.scrollLeft += 1;
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_this.core.$outer.scrollLeft -= 1;
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|
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_this.core.$outer.removeClass('lg-grab').addClass('lg-grabbing');
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}
|
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}
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});
|
|
|
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$(window).on('mousemove.lg.zoom', function(e) {
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if (isDraging) {
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var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
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var distanceX;
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var distanceY;
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|
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isMoved = true;
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endCoords = _this.getDragCords(e, Math.abs(rotateValue));
|
|
|
|
// reset opacity and transition duration
|
|
_this.core.$outer.addClass('lg-zoom-dragging');
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|
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if (allowY) {
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distanceY = (-Math.abs(_$el.attr('data-y'))) + ((endCoords.y - startCoords.y) * _this.getModifier(rotateValue, 'Y', rotateEl));
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} else {
|
|
distanceY = -Math.abs(_$el.attr('data-y'));
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|
}
|
|
|
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if (allowX) {
|
|
distanceX = (-Math.abs(_$el.attr('data-x'))) + ((endCoords.x - startCoords.x) * _this.getModifier(rotateValue, 'X', rotateEl));
|
|
} else {
|
|
distanceX = -Math.abs(_$el.attr('data-x'));
|
|
}
|
|
|
|
if (_this.core.s.useLeftForZoom) {
|
|
_$el.css({
|
|
left: distanceX + 'px',
|
|
top: distanceY + 'px'
|
|
});
|
|
} else {
|
|
_$el.css('transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
|
|
}
|
|
}
|
|
});
|
|
|
|
$(window).on('mouseup.lg.zoom', function(e) {
|
|
|
|
if (isDraging) {
|
|
isDraging = false;
|
|
_this.core.$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, Math.abs(rotateValue));
|
|
_this.touchendZoom(startCoords, endCoords, allowX, allowY, rotateValue);
|
|
|
|
}
|
|
|
|
isMoved = false;
|
|
}
|
|
|
|
_this.core.$outer.removeClass('lg-grabbing').addClass('lg-grab');
|
|
|
|
});
|
|
};
|
|
|
|
Zoom.prototype.touchendZoom = function(startCoords, endCoords, allowX, allowY, rotateValue) {
|
|
|
|
var _this = this;
|
|
var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
|
|
var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
|
|
var rotateEl = _this.core.$slide.eq(_this.core.index).find('.lg-img-rotate')[0];
|
|
var distanceX = (-Math.abs(_$el.attr('data-x'))) + ((endCoords.x - startCoords.x) * _this.getModifier(rotateValue, 'X', rotateEl));
|
|
var distanceY = (-Math.abs(_$el.attr('data-y'))) + ((endCoords.y - startCoords.y) * _this.getModifier(rotateValue, 'Y', rotateEl));
|
|
var possibleDragCords = _this.getPossibleDragCords($image, Math.abs(rotateValue));
|
|
if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
|
|
if (allowY) {
|
|
if (distanceY <= -possibleDragCords.maxY) {
|
|
distanceY = -possibleDragCords.maxY;
|
|
} else if (distanceY >= -possibleDragCords.minY) {
|
|
distanceY = -possibleDragCords.minY;
|
|
}
|
|
}
|
|
|
|
if (allowX) {
|
|
if (distanceX <= -possibleDragCords.maxX) {
|
|
distanceX = -possibleDragCords.maxX;
|
|
} else if (distanceX >= -possibleDragCords.minX) {
|
|
distanceX = -possibleDragCords.minX;
|
|
}
|
|
}
|
|
|
|
if (allowY) {
|
|
_$el.attr('data-y', Math.abs(distanceY));
|
|
} else {
|
|
distanceY = -Math.abs(_$el.attr('data-y'));
|
|
}
|
|
|
|
if (allowX) {
|
|
_$el.attr('data-x', Math.abs(distanceX));
|
|
} else {
|
|
distanceX = -Math.abs(_$el.attr('data-x'));
|
|
}
|
|
|
|
if (_this.core.s.useLeftForZoom) {
|
|
_$el.css({
|
|
left: distanceX + 'px',
|
|
top: distanceY + 'px'
|
|
});
|
|
} else {
|
|
_$el.css('transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
|
|
}
|
|
|
|
}
|
|
};
|
|
|
|
Zoom.prototype.destroy = function() {
|
|
|
|
var _this = this;
|
|
|
|
// Unbind all events added by lightGallery zoom plugin
|
|
_this.core.$el.off('.lg.zoom');
|
|
$(window).off('.lg.zoom');
|
|
_this.core.$slide.off('.lg.zoom');
|
|
_this.core.$el.off('.lg.tm.zoom');
|
|
_this.resetZoom();
|
|
clearTimeout(_this.zoomabletimeout);
|
|
_this.zoomabletimeout = false;
|
|
};
|
|
|
|
$.fn.lightGallery.modules.zoom = Zoom;
|
|
|
|
})();
|
|
|
|
|
|
}));
|