lutim/themes/default/templates/partial/gallery.js.ep

% # vim:set sw=4 ts=4 sts=4 ft=javascript expandtab:
var absUrl = '<%= url_for('/') %>';

var initPhotoSwipeFromDOM = function(gallerySelector) {

    // parse slide data (url, title, size ...) from DOM elements
    // (children of gallerySelector)
    var parseThumbnailElements = function(el) {
        var thumbElements = el.childNodes,
            numNodes = thumbElements.length,
            items = [],
            figureEl,
            linkEl,
            size,
            item;

        for(var i = 0; i < numNodes; i++) {

            figureEl = thumbElements[i]; // <figure> element

            // include only element nodes
            if(figureEl.nodeType !== 1) {
                continue;
            }

            linkEl = figureEl.children[0]; // <a> element

            size = linkEl.getAttribute('data-size').split('x');

            // create slide object
            item = {
                src: linkEl.getAttribute('href'),
                w: parseInt(size[0], 10),
                h: parseInt(size[1], 10)
            };



            if(figureEl.children.length > 1) {
                // <figcaption> content
                item.title = figureEl.children[1].innerHTML;
            }

            if(linkEl.children.length > 0) {
                // <img> thumbnail element, retrieving thumbnail url
                item.msrc = linkEl.children[0].getAttribute('src');
            }

            item.el = figureEl; // save link to element for getThumbBoundsFn
            items.push(item);
        }

        return items;
    };

    // find nearest parent element
    var closest = function closest(el, fn) {
        return el && ( fn(el) ? el : closest(el.parentNode, fn) );
    };

    // triggers when user clicks on thumbnail
    var onThumbnailsClick = function(e) {
        e = e || window.event;
        e.preventDefault ? e.preventDefault() : e.returnValue = false;

        var eTarget = e.target || e.srcElement;

        // find root element of slide
        var clickedListItem = closest(eTarget, function(el) {
            return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
        });

        if(!clickedListItem) {
            return;
        }

        // find index of clicked item by looping through all child nodes
        // alternatively, you may define index via data- attribute
        var clickedGallery = clickedListItem.parentNode,
            childNodes = clickedListItem.parentNode.childNodes,
            numChildNodes = childNodes.length,
            nodeIndex = 0,
            index;

        for (var i = 0; i < numChildNodes; i++) {
            if(childNodes[i].nodeType !== 1) {
                continue;
            }

            if(childNodes[i] === clickedListItem) {
                index = nodeIndex;
                break;
            }
            nodeIndex++;
        }



        if(index >= 0) {
            // open PhotoSwipe if valid index found
            openPhotoSwipe( index, clickedGallery );
        }
        return false;
    };

    // parse picture index and gallery index from URL (#&pid=1&gid=2)
    var photoswipeParseHash = function() {
        var hash = window.location.hash.substring(1),
        params = {};

        if(hash.length < 5) {
            return params;
        }

        var vars = hash.split('&');
        for (var i = 0; i < vars.length; i++) {
            if(!vars[i]) {
                continue;
            }
            var pair = vars[i].split('=');
            if(pair.length < 2) {
                continue;
            }
            params[pair[0]] = pair[1];
        }

        if(params.gid) {
            params.gid = parseInt(params.gid, 10);
        }

        return params;
    };

    var openPhotoSwipe = function(index, galleryElement, disableAnimation, fromURL) {
        var pswpElement = document.querySelectorAll('.pswp')[0],
            gallery,
            options,
            items;

        items = parseThumbnailElements(galleryElement);

        // define options (if needed)
        options = {

            // define gallery index (for URL)
            galleryUID: galleryElement.getAttribute('data-pswp-uid'),

            getThumbBoundsFn: function(index) {
                // See Options -> getThumbBoundsFn section of documentation for more info
                var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                    pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                    rect = thumbnail.getBoundingClientRect();

                return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
            }

        };

        // PhotoSwipe opened from URL
        if(fromURL) {
            if(options.galleryPIDs) {
                // parse real index when custom PIDs are used
                // http://photoswipe.com/documentation/faq.html#custom-pid-in-url
                for(var j = 0; j < items.length; j++) {
                    if(items[j].pid == index) {
                        options.index = j;
                        break;
                    }
                }
            } else {
                // in URL indexes start from 1
                options.index = parseInt(index, 10) - 1;
            }
        } else {
            options.index = parseInt(index, 10);
        }

        // exit if index not found
        if( isNaN(options.index) ) {
            return;
        }

        if(disableAnimation) {
            options.showAnimationDuration = 0;
        }

        // Pass data to PhotoSwipe and initialize it
        gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
        gallery.init();
    };

    // loop through all gallery elements and bind events
    var galleryElements = document.querySelectorAll( gallerySelector );

    for(var i = 0, l = galleryElements.length; i < l; i++) {
        galleryElements[i].setAttribute('data-pswp-uid', i + 1);
        galleryElements[i].onclick = onThumbnailsClick;
    }

    // Parse URL and open gallery if it contains #&pid=3&gid=1
    var hashData = photoswipeParseHash();
    if(hashData.pid && hashData.gid) {
        openPhotoSwipe( hashData.pid ,  galleryElements[ hashData.gid - 1 ], true, true );
    }
};

function addAlert(e) {
    $('#infos-msg').append(`<div class="alert alert-danger">
                                <button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>
                                <strong><%= l('Something bad happened') %></strong><br>
                                ${cleanName(e, false)}
                            </div>`);
}

function appendToGallery(url, width, height) {
    $('.gallery').append(`<figure itemprop="associatedMedia" itemscope itemtype="http://schema.org/ImageObject">
                              <a href="${url}" itemprop="contentUrl" data-size="${width}x${height}">
                                  <img src="${url}?width=275" itemprop="thumbnail" alt="" class="img-responsive"/>
                              </a>
                          </figure>`);
}

function nextOrInitGallery(keys) {
    if (keys.length > 0) {
        addElement(keys);
    } else {
        initPhotoSwipeFromDOM('.gallery');
    }
}

function addElement(keys) {
    element = keys.shift();
    if (!element.match('xcf')) {
        $.ajax({
            url: `<%= url_for('about_img') %>${element}`,
            method: 'GET',
            dataType: 'json',
            success: function(data, textStatus, jqXHR) {
                if (data.success) {
                    if (data.data.width && data.data.height) {
                        appendToGallery(`${absUrl}${element}`, data.data.width, data.data.height);
                        nextOrInitGallery(keys);
                    } else {
                        var img = new Image();
                        img.onload = function(){
                            appendToGallery(`${absUrl}${element}`, img.width, img.height);
                            nextOrInitGallery(keys);
                        }
                        img.src = `${absUrl}${element}`;
                    }
                } else {
                    addAlert(data.msg);
                    nextOrInitGallery(keys);
                }
            },
            error: function(jqXHR, textStatus, errorThrown) {
                nextOrInitGallery(keys);
            }
        });
    }
}

$(document).ready(function() {
    var key = window.location.hash.substring(1);  // Get key
    // First, strip everything after the equal sign (=) which signals end of base64 string.
    i = key.indexOf('='); if (i>-1) { key = key.substring(0, i + 1); }
    // If the equal sign was not present, some parameters may remain:
    i = key.indexOf('&'); if (i>-1) { key = key.substring(0, i); }

    var keys = key.split(',');
    $('#img-nb').append('<p><%= l('There is XXXX image(s) in the gallery') %></p>'.replace('XXXX', keys.length));

    $('#download-all').attr('href', $('#download-all').attr('href') + keys.join('&i='));

    addElement(keys);
});