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lg-zoom.js
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/**!
* lg-zoom.js | 1.0.1 | December 22nd 2016
* http://sachinchoolur.github.io/lg-zoom.js
* Copyright (c) 2016 Sachin N;
* @license GPLv3
*/(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.LgZoom = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
(function (global, factory) {
if (typeof define === "function" && define.amd) {
define([], factory);
} else if (typeof exports !== "undefined") {
factory();
} else {
var mod = {
exports: {}
};
factory();
global.lgZoom = mod.exports;
}
})(this, function () {
'use strict';
var _extends = Object.assign || function (target) {
for (var i = 1; i < arguments.length; i++) {
var source = arguments[i];
for (var key in source) {
if (Object.prototype.hasOwnProperty.call(source, key)) {
target[key] = source[key];
}
}
}
return target;
};
var getUseLeft = function getUseLeft() {
var useLeft = false;
var isChrome = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
if (isChrome && parseInt(isChrome[2], 10) < 54) {
useLeft = true;
}
return useLeft;
};
var zoomDefaults = {
scale: 1,
zoom: true,
actualSize: true,
enableZoomAfter: 300,
useLeftForZoom: getUseLeft()
};
var Zoom = function Zoom(element) {
this.el = element;
this.core = window.lgData[this.el.getAttribute('lg-uid')];
this.core.s = _extends({}, zoomDefaults, 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.innerWidth / 2;
this.pageY = window.innerHeight / 2 + (document.documentElement.scrollTop || document.body.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>';
}
if (_this.core.s.useLeftForZoom) {
utils.addClass(_this.core.outer, 'lg-use-left-for-zoom');
} else {
utils.addClass(_this.core.outer, 'lg-use-transition-for-zoom');
}
this.core.outer.querySelector('.lg-toolbar').insertAdjacentHTML('beforeend', zoomIcons);
// Add zoomable class
utils.on(_this.core.el, 'onSlideItemLoad.lgtmzoom', function (event) {
// delay will be 0 except first time
var _speed = _this.core.s.enableZoomAfter + event.detail.delay;
// set _speed value 0 if gallery opened from direct url and if it is first slide
if (utils.hasClass(document.body, 'lg-from-hash') && event.detail.delay) {
// will execute only once
_speed = 0;
} else {
// Remove lg-from-hash to enable starting animation.
utils.removeClass(document.body, 'lg-from-hash');
}
_this.zoomabletimeout = setTimeout(function () {
utils.addClass(_this.core.___slide[event.detail.index], '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 zoom(scaleVal) {
var image = _this.core.outer.querySelector('.lg-current .lg-image');
var _x;
var _y;
// Find offset manually to avoid issue after zoom
var offsetX = (window.innerWidth - image.clientWidth) / 2;
var offsetY = (window.innerHeight - image.clientHeight) / 2 + (document.documentElement.scrollTop || document.body.scrollTop);
_x = _this.pageX - offsetX;
_y = _this.pageY - offsetY;
var x = (scaleVal - 1) * _x;
var y = (scaleVal - 1) * _y;
utils.setVendor(image, 'Transform', 'scale3d(' + scaleVal + ', ' + scaleVal + ', 1)');
image.setAttribute('data-scale', scaleVal);
if (_this.core.s.useLeftForZoom) {
image.parentElement.style.left = -x + 'px';
image.parentElement.style.top = -y + 'px';
} else {
utils.setVendor(image.parentElement, 'Transform', 'translate3d(-' + x + 'px, -' + y + 'px, 0)');
}
image.parentElement.setAttribute('data-x', x);
image.parentElement.setAttribute('data-y', y);
};
var callScale = function callScale() {
if (scale > 1) {
utils.addClass(_this.core.outer, 'lg-zoomed');
} else {
_this.resetZoom();
}
if (scale < 1) {
scale = 1;
}
zoom(scale);
};
var actualSize = function actualSize(event, image, index, fromIcon) {
var w = image.clientWidth;
var nw;
if (_this.core.s.dynamic) {
nw = _this.core.s.dynamicEl[index].width || image.naturalWidth || w;
} else {
nw = _this.core.items[index].getAttribute('data-width') || image.naturalWidth || w;
}
var _scale;
if (utils.hasClass(_this.core.outer, 'lg-zoomed')) {
scale = 1;
} else {
if (nw > w) {
_scale = nw / w;
scale = _scale || 2;
}
}
if (fromIcon) {
_this.pageX = window.innerWidth / 2;
_this.pageY = window.innerHeight / 2 + (document.documentElement.scrollTop || document.body.scrollTop);
} else {
_this.pageX = event.pageX || event.targetTouches[0].pageX;
_this.pageY = event.pageY || event.targetTouches[0].pageY;
}
callScale();
setTimeout(function () {
utils.removeClass(_this.core.outer, 'lg-grabbing');
utils.addClass(_this.core.outer, 'lg-grab');
}, 10);
};
var tapped = false;
// event triggered after appending slide content
utils.on(_this.core.el, 'onAferAppendSlide.lgtmzoom', function (event) {
var index = event.detail.index;
// Get the current element
var image = _this.core.___slide[index].querySelector('.lg-image');
if (!_this.core.isTouch) {
utils.on(image, 'dblclick', function (event) {
actualSize(event, image, index);
});
}
if (_this.core.isTouch) {
utils.on(image, '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
utils.on(window, 'resize.lgzoom scroll.lgzoom orientationchange.lgzoom', function () {
_this.pageX = window.innerWidth / 2;
_this.pageY = window.innerHeight / 2 + (document.documentElement.scrollTop || document.body.scrollTop);
zoom(scale);
});
utils.on(document.getElementById('lg-zoom-out'), 'click.lg', function () {
if (_this.core.outer.querySelector('.lg-current .lg-image')) {
scale -= _this.core.s.scale;
callScale();
}
});
utils.on(document.getElementById('lg-zoom-in'), 'click.lg', function () {
if (_this.core.outer.querySelector('.lg-current .lg-image')) {
scale += _this.core.s.scale;
callScale();
}
});
utils.on(document.getElementById('lg-actual-size'), 'click.lg', function (event) {
actualSize(event, _this.core.___slide[_this.core.index].querySelector('.lg-image'), _this.core.index, true);
});
// Reset zoom on slide change
utils.on(_this.core.el, 'onBeforeSlide.lgtm', 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 () {
utils.removeClass(this.core.outer, 'lg-zoomed');
for (var i = 0; i < this.core.___slide.length; i++) {
if (this.core.___slide[i].querySelector('.lg-img-wrap')) {
this.core.___slide[i].querySelector('.lg-img-wrap').removeAttribute('style');
this.core.___slide[i].querySelector('.lg-img-wrap').removeAttribute('data-x');
this.core.___slide[i].querySelector('.lg-img-wrap').removeAttribute('data-y');
}
}
for (var j = 0; j < this.core.___slide.length; j++) {
if (this.core.___slide[j].querySelector('.lg-image')) {
this.core.___slide[j].querySelector('.lg-image').removeAttribute('style');
this.core.___slide[j].querySelector('.lg-image').removeAttribute('data-scale');
}
}
// Reset pagx pagy values to center
this.pageX = window.innerWidth / 2;
this.pageY = window.innerHeight / 2 + (document.documentElement.scrollTop || document.body.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;
for (var i = 0; i < _this.core.___slide.length; i++) {
/*jshint loopfunc: true */
utils.on(_this.core.___slide[i], 'touchstart.lg', function (e) {
if (utils.hasClass(_this.core.outer, 'lg-zoomed')) {
var image = _this.core.___slide[_this.core.index].querySelector('.lg-object');
allowY = image.offsetHeight * image.getAttribute('data-scale') > _this.core.outer.querySelector('.lg').clientHeight;
allowX = image.offsetWidth * image.getAttribute('data-scale') > _this.core.outer.querySelector('.lg').clientWidth;
if (allowX || allowY) {
e.preventDefault();
startCoords = {
x: e.targetTouches[0].pageX,
y: e.targetTouches[0].pageY
};
}
}
});
}
for (var j = 0; j < _this.core.___slide.length; j++) {
/*jshint loopfunc: true */
utils.on(_this.core.___slide[j], 'touchmove.lg', function (e) {
if (utils.hasClass(_this.core.outer, 'lg-zoomed')) {
var _el = _this.core.___slide[_this.core.index].querySelector('.lg-img-wrap');
var distanceX;
var distanceY;
e.preventDefault();
isMoved = true;
endCoords = {
x: e.targetTouches[0].pageX,
y: e.targetTouches[0].pageY
};
// reset opacity and transition duration
utils.addClass(_this.core.outer, 'lg-zoom-dragging');
if (allowY) {
distanceY = -Math.abs(_el.getAttribute('data-y')) + (endCoords.y - startCoords.y);
} else {
distanceY = -Math.abs(_el.getAttribute('data-y'));
}
if (allowX) {
distanceX = -Math.abs(_el.getAttribute('data-x')) + (endCoords.x - startCoords.x);
} else {
distanceX = -Math.abs(_el.getAttribute('data-x'));
}
if (Math.abs(endCoords.x - startCoords.x) > 15 || Math.abs(endCoords.y - startCoords.y) > 15) {
if (_this.core.s.useLeftForZoom) {
_el.style.left = distanceX + 'px';
_el.style.top = distanceY + 'px';
} else {
utils.setVendor(_el, 'Transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
}
}
}
});
}
for (var k = 0; k < _this.core.___slide.length; k++) {
/*jshint loopfunc: true */
utils.on(_this.core.___slide[k], 'touchend.lg', function () {
if (utils.hasClass(_this.core.outer, 'lg-zoomed')) {
if (isMoved) {
isMoved = false;
utils.removeClass(_this.core.outer, '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;
for (var i = 0; i < _this.core.___slide.length; i++) {
/*jshint loopfunc: true */
utils.on(_this.core.___slide[i], 'mousedown.lgzoom', function (e) {
// execute only on .lg-object
var image = _this.core.___slide[_this.core.index].querySelector('.lg-object');
allowY = image.offsetHeight * image.getAttribute('data-scale') > _this.core.outer.querySelector('.lg').clientHeight;
allowX = image.offsetWidth * image.getAttribute('data-scale') > _this.core.outer.querySelector('.lg').clientWidth;
if (utils.hasClass(_this.core.outer, 'lg-zoomed')) {
if (utils.hasClass(e.target, '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;
utils.removeClass(_this.core.outer, 'lg-grab');
utils.addClass(_this.core.outer, 'lg-grabbing');
}
}
});
}
utils.on(window, 'mousemove.lgzoom', function (e) {
if (isDraging) {
var _el = _this.core.___slide[_this.core.index].querySelector('.lg-img-wrap');
var distanceX;
var distanceY;
isMoved = true;
endCoords = {
x: e.pageX,
y: e.pageY
};
// reset opacity and transition duration
utils.addClass(_this.core.outer, 'lg-zoom-dragging');
if (allowY) {
distanceY = -Math.abs(_el.getAttribute('data-y')) + (endCoords.y - startCoords.y);
} else {
distanceY = -Math.abs(_el.getAttribute('data-y'));
}
if (allowX) {
distanceX = -Math.abs(_el.getAttribute('data-x')) + (endCoords.x - startCoords.x);
} else {
distanceX = -Math.abs(_el.getAttribute('data-x'));
}
if (_this.core.s.useLeftForZoom) {
_el.style.left = distanceX + 'px';
_el.style.top = distanceY + 'px';
} else {
utils.setVendor(_el, 'Transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
}
}
});
utils.on(window, 'mouseup.lgzoom', function (e) {
if (isDraging) {
isDraging = false;
utils.removeClass(_this.core.outer, '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;
}
utils.removeClass(_this.core.outer, 'lg-grabbing');
utils.addClass(_this.core.outer, 'lg-grab');
});
};
Zoom.prototype.touchendZoom = function (startCoords, endCoords, allowX, allowY) {
var _this = this;
var _el = _this.core.___slide[_this.core.index].querySelector('.lg-img-wrap');
var image = _this.core.___slide[_this.core.index].querySelector('.lg-object');
var distanceX = -Math.abs(_el.getAttribute('data-x')) + (endCoords.x - startCoords.x);
var distanceY = -Math.abs(_el.getAttribute('data-y')) + (endCoords.y - startCoords.y);
var minY = (_this.core.outer.querySelector('.lg').clientHeight - image.offsetHeight) / 2;
var maxY = Math.abs(image.offsetHeight * Math.abs(image.getAttribute('data-scale')) - _this.core.outer.querySelector('.lg').clientHeight + minY);
var minX = (_this.core.outer.querySelector('.lg').clientWidth - image.offsetWidth) / 2;
var maxX = Math.abs(image.offsetWidth * Math.abs(image.getAttribute('data-scale')) - _this.core.outer.querySelector('.lg').clientWidth + 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.setAttribute('data-y', Math.abs(distanceY));
} else {
distanceY = -Math.abs(_el.getAttribute('data-y'));
}
if (allowX) {
_el.setAttribute('data-x', Math.abs(distanceX));
} else {
distanceX = -Math.abs(_el.getAttribute('data-x'));
}
if (_this.core.s.useLeftForZoom) {
_el.style.left = distanceX + 'px';
_el.style.top = distanceY + 'px';
} else {
utils.setVendor(_el, 'Transform', 'translate3d(' + distanceX + 'px, ' + distanceY + 'px, 0)');
}
}
};
Zoom.prototype.destroy = function () {
var _this = this;
// Unbind all events added by lightGallery zoom plugin
utils.off(_this.core.el, '.lgzoom');
utils.off(window, '.lgzoom');
for (var i = 0; i < _this.core.___slide.length; i++) {
utils.off(_this.core.___slide[i], '.lgzoom');
}
utils.off(_this.core.el, '.lgtmzoom');
_this.resetZoom();
clearTimeout(_this.zoomabletimeout);
_this.zoomabletimeout = false;
};
window.lgModules.zoom = Zoom;
});
},{}]},{},[1])(1)
});