/*! lg-zoom - v1.0.0 - 2016-09-20
* http://sachinchoolur.github.io/lightGallery
* Copyright (c) 2016 Sachin N; Licensed GPLv3 */
(function (root, factory) {
if (typeof define === 'function' && define.amd) {
// AMD. Register as an anonymous module unless amdModuleId is set
define([], function () {
return (factory());
});
} else if (typeof exports === 'object') {
// Node. Does not work with strict CommonJS, but
// only CommonJS-like environments that support module.exports,
// like Node.
module.exports = factory();
} else {
factory();
}
}(this, function () {
(function($, window, document, undefined) {
'use strict';
var defaults = {
scale: 1,
zoom: true,
actualSize: true,
enableZoomAfter: 300
};
var Zoom = function(element) {
this.core = $(element).data('lightGallery');
this.core.s = $.extend({}, defaults, this.core.s);
if (this.core.s.zoom && this.core.doCss()) {
this.init();
// Store the zoomable timeout value just to clear it while closing
this.zoomabletimeout = false;
// Set the initial value center
this.pageX = $(window).width() / 2;
this.pageY = ($(window).height() / 2) + $(window).scrollTop();
}
return this;
};
Zoom.prototype.init = function() {
var _this = this;
var zoomIcons = '<span id="lg-zoom-in" class="lg-icon"></span><span id="lg-zoom-out" class="lg-icon"></span>';
if (_this.core.s.actualSize) {
zoomIcons += '<span id="lg-actual-size" class="lg-icon"></span>';
}
this.core.$outer.find('.lg-toolbar').append(zoomIcons);
// Add zoomable class
_this.core.$el.on('onSlideItemLoad.lg.tm.zoom', function(event, index, delay) {
// delay will be 0 except first time
var _speed = _this.core.s.enableZoomAfter + delay;
// set _speed value 0 if gallery opened from direct url and if it is first slide
if ($('body').hasClass('lg-from-hash') && delay) {
// will execute only once
_speed = 0;
} else {
// Remove lg-from-hash to enable starting animation.
$('body').removeClass('lg-from-hash');
}
_this.zoomabletimeout = setTimeout(function() {
_this.core.$slide.eq(index).addClass('lg-zoomable');
}, _speed + 30);
});
var scale = 1;
/**
* @desc Image zoom
* Translate the wrap and scale the image to get better user experience
*
* @param {String} scaleVal - Zoom decrement/increment value
*/
var zoom = function(scaleVal) {
var $image = _this.core.$outer.find('.lg-current .lg-image');
var _x;
var _y;
// Find offset manually to avoid issue after zoom
var offsetX = ($(window).width() - $image.width()) / 2;
var offsetY = (($(window).height() - $image.height()) / 2) + $(window).scrollTop();
_x = _this.pageX - offsetX;
_y = _this.pageY - offsetY;
var x = (scaleVal - 1) * (_x);
var y = (scaleVal - 1) * (_y);
$image.css('transform', 'scale3d(' + scaleVal + ', ' + scaleVal + ', 1)').attr('data-scale', scaleVal);
$image.parent().css({
left: -x + 'px',
top: -y + 'px'
}).attr('data-x', x).attr('data-y', y);
};
var callScale = function() {
if (scale > 1) {
_this.core.$outer.addClass('lg-zoomed');
} else {
_this.resetZoom();
}
if (scale < 1) {
scale = 1;
}
zoom(scale);
};
var actualSize = function(event, $image, index, fromIcon) {
var w = $image.width();
var nw;
if (_this.core.s.dynamic) {
nw = _this.core.s.dynamicEl[index].width || $image[0].naturalWidth || w;
} else {
nw = _this.core.$items.eq(index).attr('data-width') || $image[0].naturalWidth || w;
}
var _scale;
if (_this.core.$outer.hasClass('lg-zoomed')) {
scale = 1;
} else {
if (nw > w) {
_scale = nw / w;
scale = _scale || 2;
}
}
if (fromIcon) {
_this.pageX = $(window).width() / 2;
_this.pageY = ($(window).height() / 2) + $(window).scrollTop();
} else {
_this.pageX = event.pageX || event.originalEvent.targetTouches[0].pageX;
_this.pageY = event.pageY || event.originalEvent.targetTouches[0].pageY;
}
callScale();
setTimeout(function() {
_this.core.$outer.removeClass('lg-grabbing').addClass('lg-grab');
}, 10);
};
var tapped = false;
// event triggered after appending slide content
_this.core.$el.on('onAferAppendSlide.lg.tm.zoom', function(event, index) {
// Get the current element
var $image = _this.core.$slide.eq(index).find('.lg-image');
$image.on('dblclick', function(event) {
actualSize(event, $image, index);
});
$image.on('touchstart', function(event) {
if (!tapped) {
tapped = setTimeout(function() {
tapped = null;
}, 300);
} else {
clearTimeout(tapped);
tapped = null;
actualSize(event, $image, index);
}
event.preventDefault();
});
});
// Update zoom on resize and orientationchange
$(window).on('resize.lg.zoom scroll.lg.zoom orientationchange.lg.zoom', function() {
_this.pageX = $(window).width() / 2;
_this.pageY = ($(window).height() / 2) + $(window).scrollTop();
zoom(scale);
});
$('#lg-zoom-out').on('click.lg', function() {
if (_this.core.$outer.find('.lg-current .lg-image').length) {
scale -= _this.core.s.scale;
callScale();
}
});
$('#lg-zoom-in').on('click.lg', function() {
if (_this.core.$outer.find('.lg-current .lg-image').length) {
scale += _this.core.s.scale;
callScale();
}
});
$('#lg-actual-size').on('click.lg', function(event) {
actualSize(event, _this.core.$slide.eq(_this.core.index).find('.lg-image'), _this.core.index, true);
});
// Reset zoom on slide change
_this.core.$el.on('onBeforeSlide.lg.tm', function() {
scale = 1;
_this.resetZoom();
});
// Drag option after zoom
if (!_this.core.isTouch) {
_this.zoomDrag();
}
if (_this.core.isTouch) {
_this.zoomSwipe();
}
};
// Reset zoom effect
Zoom.prototype.resetZoom = function() {
this.core.$outer.removeClass('lg-zoomed');
this.core.$slide.find('.lg-img-wrap').removeAttr('style data-x data-y');
this.core.$slide.find('.lg-image').removeAttr('style data-scale');
// Reset pagx pagy values to center
this.pageX = $(window).width() / 2;
this.pageY = ($(window).height() / 2) + $(window).scrollTop();
};
Zoom.prototype.zoomSwipe = function() {
var _this = this;
var startCoords = {};
var endCoords = {};
var isMoved = false;
// Allow x direction drag
var allowX = false;
// Allow Y direction drag
var allowY = false;
_this.core.$slide.on('touchstart.lg', function(e) {
if (_this.core.$outer.hasClass('lg-zoomed')) {
var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
allowY = $image.outerHeight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
allowX = $image.outerWidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();
if ((allowX || allowY)) {
e.preventDefault();
startCoords = {
x: e.originalEvent.targetTouches[0].pageX,
y: e.originalEvent.targetTouches[0].pageY
};
}
}
});
_this.core.$slide.on('touchmove.lg', function(e) {
if (_this.core.$outer.hasClass('lg-zoomed')) {
var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
var distanceX;
var distanceY;
e.preventDefault();
isMoved = true;
endCoords = {
x: e.originalEvent.targetTouches[0].pageX,
y: e.originalEvent.targetTouches[0].pageY
};
// reset opacity and transition duration
_this.core.$outer.addClass('lg-zoom-dragging');
if (allowY) {
distanceY = (-Math.abs(_$el.attr('data-y'))) + (endCoords.y - startCoords.y);
} else {
distanceY = -Math.abs(_$el.attr('data-y'));
}
if (allowX) {
distanceX = (-Math.abs(_$el.attr('data-x'))) + (endCoords.x - startCoords.x);
} else {
distanceX = -Math.abs(_$el.attr('data-x'));
}
if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
_$el.css({
left: distanceX + 'px',
top: distanceY + 'px'
});
}
}
});
_this.core.$slide.on('touchend.lg', function() {
if (_this.core.$outer.hasClass('lg-zoomed')) {
if (isMoved) {
isMoved = false;
_this.core.$outer.removeClass('lg-zoom-dragging');
_this.touchendZoom(startCoords, endCoords, allowX, allowY);
}
}
});
};
Zoom.prototype.zoomDrag = function() {
var _this = this;
var startCoords = {};
var endCoords = {};
var isDraging = false;
var isMoved = false;
// Allow x direction drag
var allowX = false;
// Allow Y direction drag
var allowY = false;
_this.core.$slide.on('mousedown.lg.zoom', function(e) {
// execute only on .lg-object
var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
allowY = $image.outerHeight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
allowX = $image.outerWidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();
if (_this.core.$outer.hasClass('lg-zoomed')) {
if ($(e.target).hasClass('lg-object') && (allowX || allowY)) {
e.preventDefault();
startCoords = {
x: e.pageX,
y: e.pageY
};
isDraging = true;
// ** Fix for webkit cursor issue https://code.google.com/p/chromium/issues/detail?id=26723
_this.core.$outer.scrollLeft += 1;
_this.core.$outer.scrollLeft -= 1;
_this.core.$outer.removeClass('lg-grab').addClass('lg-grabbing');
}
}
});
$(window).on('mousemove.lg.zoom', function(e) {
if (isDraging) {
var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
var distanceX;
var distanceY;
isMoved = true;
endCoords = {
x: e.pageX,
y: e.pageY
};
// reset opacity and transition duration
_this.core.$outer.addClass('lg-zoom-dragging');
if (allowY) {
distanceY = (-Math.abs(_$el.attr('data-y'))) + (endCoords.y - startCoords.y);
} else {
distanceY = -Math.abs(_$el.attr('data-y'));
}
if (allowX) {
distanceX = (-Math.abs(_$el.attr('data-x'))) + (endCoords.x - startCoords.x);
} else {
distanceX = -Math.abs(_$el.attr('data-x'));
}
_$el.css({
left: distanceX + 'px',
top: distanceY + 'px'
});
}
});
$(window).on('mouseup.lg.zoom', function(e) {
if (isDraging) {
isDraging = false;
_this.core.$outer.removeClass('lg-zoom-dragging');
// Fix for chrome mouse move on click
if (isMoved && ((startCoords.x !== endCoords.x) || (startCoords.y !== endCoords.y))) {
endCoords = {
x: e.pageX,
y: e.pageY
};
_this.touchendZoom(startCoords, endCoords, allowX, allowY);
}
isMoved = false;
}
_this.core.$outer.removeClass('lg-grabbing').addClass('lg-grab');
});
};
Zoom.prototype.touchendZoom = function(startCoords, endCoords, allowX, allowY) {
var _this = this;
var _$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 distanceX = (-Math.abs(_$el.attr('data-x'))) + (endCoords.x - startCoords.x);
var distanceY = (-Math.abs(_$el.attr('data-y'))) + (endCoords.y - startCoords.y);
var minY = (_this.core.$outer.find('.lg').height() - $image.outerHeight()) / 2;
var maxY = Math.abs(($image.outerHeight() * Math.abs($image.attr('data-scale'))) - _this.core.$outer.find('.lg').height() + minY);
var minX = (_this.core.$outer.find('.lg').width() - $image.outerWidth()) / 2;
var maxX = Math.abs(($image.outerWidth() * Math.abs($image.attr('data-scale'))) - _this.core.$outer.find('.lg').width() + minX);
if ((Math.abs(endCoords.x - startCoords.x) > 15) || (Math.abs(endCoords.y - startCoords.y) > 15)) {
if (allowY) {
if (distanceY <= -maxY) {
distanceY = -maxY;
} else if (distanceY >= -minY) {
distanceY = -minY;
}
}
if (allowX) {
if (distanceX <= -maxX) {
distanceX = -maxX;
} else if (distanceX >= -minX) {
distanceX = -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'));
}
_$el.css({
left: distanceX + 'px',
top: distanceY + 'px'
});
}
};
Zoom.prototype.destroy = function() {
var _this = this;
// Unbind all events added by lightGallery zoom plugin
_this.core.$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;
})(jQuery, window, document);
}));