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450 lines
15 KiB
JavaScript
450 lines
15 KiB
JavaScript
/*! lightgallery - v1.2.14 - 2016-01-18
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* http://sachinchoolur.github.io/lightGallery/
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* Copyright (c) 2016 Sachin N; Licensed Apache 2.0 */
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(function($, window, document, undefined) {
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'use strict';
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var defaults = {
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scale: 1,
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zoom: true,
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enableZoomAfter: 300
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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) + $(window).scrollTop();
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}
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return this;
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};
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Zoom.prototype.init = function() {
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var _this = this;
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var zoomIcons = '<span id="lg-zoom-in" class="lg-icon"></span><span id="lg-zoom-out" class="lg-icon"></span>';
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this.core.$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() - $image.width()) / 2;
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var offsetY = (($(window).height() - $image.height()) / 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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$image.parent().css('transform', 'translate3d(-' + x + 'px, -' + y + 'px, 0)').attr('data-x', x).attr('data-y', y);
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};
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var callScale = function() {
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if (scale > 1) {
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_this.core.$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) {
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var w = $image.width();
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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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_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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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.$outer.find('.lg-current .lg-image').length) {
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scale += _this.core.s.scale;
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callScale();
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}
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});
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// Reset zoom on slide change
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_this.core.$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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if (!_this.core.isTouch) {
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_this.zoomDrag();
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}
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if (_this.core.isTouch) {
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_this.zoomSwipe();
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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) + $(window).scrollTop();
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};
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Zoom.prototype.zoomSwipe = function() {
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var _this = this;
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var startCoords = {};
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var endCoords = {};
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var isMoved = false;
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// Allow x direction drag
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var allowX = false;
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// Allow Y direction drag
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var allowY = false;
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_this.core.$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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allowY = $image.outerHeight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
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allowX = $image.outerWidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();
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if ((allowX || allowY)) {
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e.preventDefault();
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startCoords = {
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x: e.originalEvent.targetTouches[0].pageX,
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y: e.originalEvent.targetTouches[0].pageY
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};
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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 = {
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x: e.originalEvent.targetTouches[0].pageX,
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y: e.originalEvent.targetTouches[0].pageY
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};
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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);
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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);
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} else {
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distanceX = -Math.abs(_$el.attr('data-x'));
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}
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if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
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_$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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_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.$outer.removeClass('lg-zoom-dragging');
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_this.touchendZoom(startCoords, endCoords, allowX, allowY);
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}
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}
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});
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};
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Zoom.prototype.zoomDrag = function() {
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var _this = this;
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var startCoords = {};
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var endCoords = {};
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var isDraging = false;
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var isMoved = false;
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// Allow x direction drag
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var allowX = false;
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// Allow Y direction drag
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var allowY = false;
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_this.core.$slide.on('mousedown.lg.zoom', function(e) {
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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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allowY = $image.outerHeight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
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allowX = $image.outerWidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();
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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 = {
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x: e.pageX,
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y: e.pageY
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};
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isDraging = true;
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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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_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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isMoved = true;
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endCoords = {
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x: e.pageX,
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y: e.pageY
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};
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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);
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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);
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} else {
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distanceX = -Math.abs(_$el.attr('data-x'));
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}
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_$el.css('transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
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}
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});
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$(window).on('mouseup.lg.zoom', function(e) {
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if (isDraging) {
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isDraging = false;
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_this.core.$outer.removeClass('lg-zoom-dragging');
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// Fix for chrome mouse move on click
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if (isMoved && ((startCoords.x !== endCoords.x) || (startCoords.y !== endCoords.y))) {
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endCoords = {
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x: e.pageX,
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y: e.pageY
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};
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_this.touchendZoom(startCoords, endCoords, allowX, allowY);
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}
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isMoved = false;
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}
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_this.core.$outer.removeClass('lg-grabbing').addClass('lg-grab');
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});
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};
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Zoom.prototype.touchendZoom = function(startCoords, endCoords, allowX, allowY) {
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var _this = this;
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var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
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var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
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var distanceX = (-Math.abs(_$el.attr('data-x'))) + (endCoords.x - startCoords.x);
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var distanceY = (-Math.abs(_$el.attr('data-y'))) + (endCoords.y - startCoords.y);
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var minY = (_this.core.$outer.find('.lg').height() - $image.outerHeight()) / 2;
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var maxY = Math.abs(($image.outerHeight() * 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() - $image.outerWidth()) / 2;
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var maxX = Math.abs(($image.outerWidth() * Math.abs($image.attr('data-scale'))) - _this.core.$outer.find('.lg').width() + minX);
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if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
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if (allowY) {
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if (distanceY <= -maxY) {
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distanceY = -maxY;
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} else if (distanceY >= -minY) {
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distanceY = -minY;
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}
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}
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if (allowX) {
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if (distanceX <= -maxX) {
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distanceX = -maxX;
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} else if (distanceX >= -minX) {
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distanceX = -minX;
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}
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}
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if (allowY) {
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_$el.attr('data-y', Math.abs(distanceY));
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} else {
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distanceY = -Math.abs(_$el.attr('data-y'));
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}
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if (allowX) {
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_$el.attr('data-x', Math.abs(distanceX));
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} else {
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distanceX = -Math.abs(_$el.attr('data-x'));
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}
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_$el.css('transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
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}
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};
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Zoom.prototype.destroy = function() {
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var _this = this;
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// Unbind all events added by lightGallery zoom plugin
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_this.core.$el.off('.lg.zoom');
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$(window).off('.lg.zoom');
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_this.core.$slide.off('.lg.zoom');
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_this.core.$el.off('.lg.tm.zoom');
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_this.resetZoom();
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clearTimeout(_this.zoomabletimeout);
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_this.zoomabletimeout = false;
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};
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$.fn.lightGallery.modules.zoom = Zoom;
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})(jQuery, window, document);
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