myblog/themes/Wikitten/source/libs/lightgallery/js/lg-zoom.js

/**!
 * lg-zoom.js | 0.0.2 | August 4th 2016
 * http://sachinchoolur.github.io/lg-zoom.js
 * Copyright (c) 2016 Sachin N; 
 * @license Apache 2.0 
 */(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 zoomDefaults = {
        scale: 1,
        zoom: true,
        actualSize: true,
        enableZoomAfter: 300
    };

    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>';
        }

        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);

            image.parentElement.style.left = -x + 'px';
            image.parentElement.style.top = -y + 'px';
            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) {
                        _el.style.left = distanceX + 'px';
                        _el.style.top = distanceY + 'px';
                    }
                }
            });
        }

        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'));
                }

                _el.style.left = distanceX + 'px';
                _el.style.top = distanceY + 'px';
            }
        });

        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'));
            }

            _el.style.left = distanceX + 'px';
            _el.style.top = distanceY + 'px';
        }
    };

    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)
});