287 lines
8.6 KiB
TypeScript
287 lines
8.6 KiB
TypeScript
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import { loadScript, loadStyle } from './utils';
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/**
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* Init PhotoSwipe
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* From: https://photoswipe.com/documentation/getting-started.html
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* @param gallerySelector
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*/
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var initPhotoSwipeFromDOM = function (gallerySelector) {
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// parse slide data (url, title, size ...) from DOM elements
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// (children of gallerySelector)
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var parseThumbnailElements = function (el) {
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var thumbElements = el.childNodes,
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numNodes = thumbElements.length,
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items = [],
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figureEl,
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linkEl,
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size,
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item;
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for (var i = 0; i < numNodes; i++) {
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figureEl = thumbElements[i]; // <figure> element
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// include only element nodes
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if (figureEl.nodeType !== 1) {
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continue;
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}
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linkEl = figureEl.children[0]; // <a> element
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size = linkEl.getAttribute('data-size').split('x');
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// create slide object
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item = {
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src: linkEl.getAttribute('href'),
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w: parseInt(size[0], 10),
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h: parseInt(size[1], 10)
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};
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if (figureEl.children.length > 1) {
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// <figcaption> content
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item.title = figureEl.children[1].innerHTML;
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}
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if (linkEl.children.length > 0) {
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// <img> thumbnail element, retrieving thumbnail url
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item.msrc = linkEl.children[0].getAttribute('src');
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}
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item.el = figureEl; // save link to element for getThumbBoundsFn
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items.push(item);
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}
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return items;
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};
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// find nearest parent element
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var closest = function closest(el, fn) {
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return el && (fn(el) ? el : closest(el.parentNode, fn));
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};
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// triggers when user clicks on thumbnail
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var onThumbnailsClick = function (e) {
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e = e || window.event;
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e.preventDefault ? e.preventDefault() : e.returnValue = false;
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var eTarget = e.target || e.srcElement;
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// find root element of slide
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var clickedListItem = closest(eTarget, function (el) {
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return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
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});
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if (!clickedListItem) {
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return;
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}
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// find index of clicked item by looping through all child nodes
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// alternatively, you may define index via data- attribute
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var clickedGallery = clickedListItem.parentNode,
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childNodes = clickedListItem.parentNode.childNodes,
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numChildNodes = childNodes.length,
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nodeIndex = 0,
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index;
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for (var i = 0; i < numChildNodes; i++) {
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if (childNodes[i].nodeType !== 1) {
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continue;
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}
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if (childNodes[i] === clickedListItem) {
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index = nodeIndex;
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break;
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}
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nodeIndex++;
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}
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if (index >= 0) {
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// open PhotoSwipe if valid index found
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openPhotoSwipe(index, clickedGallery);
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}
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return false;
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};
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// parse picture index and gallery index from URL (#&pid=1&gid=2)
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var photoswipeParseHash = function () {
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var hash = window.location.hash.substring(1),
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params = {};
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if (hash.length < 5) {
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return params;
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}
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var vars = hash.split('&');
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for (var i = 0; i < vars.length; i++) {
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if (!vars[i]) {
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continue;
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}
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var pair = vars[i].split('=');
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if (pair.length < 2) {
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continue;
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}
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params[pair[0]] = pair[1];
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}
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if (params.gid) {
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params.gid = parseInt(params.gid, 10);
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}
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return params;
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};
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var openPhotoSwipe = function (index, galleryElement, disableAnimation, fromURL) {
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var pswpElement = document.querySelectorAll('.pswp')[0],
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gallery,
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options,
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items;
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items = parseThumbnailElements(galleryElement);
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// define options (if needed)
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options = {
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// define gallery index (for URL)
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galleryUID: galleryElement.getAttribute('data-pswp-uid'),
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getThumbBoundsFn: function (index) {
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// See Options -> getThumbBoundsFn section of documentation for more info
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var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
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pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
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rect = thumbnail.getBoundingClientRect();
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return { x: rect.left, y: rect.top + pageYScroll, w: rect.width };
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}
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};
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// PhotoSwipe opened from URL
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if (fromURL) {
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if (options.galleryPIDs) {
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// parse real index when custom PIDs are used
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// http://photoswipe.com/documentation/faq.html#custom-pid-in-url
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for (var j = 0; j < items.length; j++) {
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if (items[j].pid == index) {
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options.index = j;
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break;
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}
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}
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} else {
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// in URL indexes start from 1
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options.index = parseInt(index, 10) - 1;
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}
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} else {
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options.index = parseInt(index, 10);
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}
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// exit if index not found
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if (isNaN(options.index)) {
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return;
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}
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if (disableAnimation) {
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options.showAnimationDuration = 0;
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}
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// Pass data to PhotoSwipe and initialize it
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gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
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gallery.init();
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};
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// loop through all gallery elements and bind events
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var galleryElements = document.querySelectorAll(gallerySelector);
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for (var i = 0, l = galleryElements.length; i < l; i++) {
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galleryElements[i].setAttribute('data-pswp-uid', i + 1);
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galleryElements[i].onclick = onThumbnailsClick;
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}
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// Parse URL and open gallery if it contains #&pid=3&gid=1
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var hashData = photoswipeParseHash();
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if (hashData.pid && hashData.gid) {
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openPhotoSwipe(hashData.pid, galleryElements[hashData.gid - 1], true, true);
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}
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};
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/**
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* Wrap adjacent figure tags with div.gallery, and append style
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* Reference: https://github.com/xieranmaya/blog/issues/6
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* @param gallery
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*/
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function wrap(gallery: HTMLElement[]) {
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let galleryContainer = document.createElement('div');
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galleryContainer.className = 'gallery';
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let parentNode = gallery[0].parentNode,
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first = gallery[0];
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parentNode.insertBefore(galleryContainer, first)
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for (let j = 0; j < gallery.length; ++j) {
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const width = gallery[j].querySelector('img').width,
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height = gallery[j].querySelector('img').height;
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gallery[j].style.flexGrow = `${width * 100 / height}`;
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gallery[j].style.flexBasis = `${width * 240 / height}px`;
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galleryContainer.appendChild(gallery[j]);
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}
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}
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/**
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* Load PhotoSwipe library dynamically
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*/
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function loadPhotoSwipe() {
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const tasks = [
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loadScript("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.min.js"),
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loadScript("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe-ui-default.min.js"),
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loadStyle("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.min.css"),
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loadStyle("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/default-skin/default-skin.min.css")
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];
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return Promise.all(tasks);
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}
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/**
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* Create gallery
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* @param selector
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*/
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function createGallery(selector: string) {
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const figures = document.querySelector(selector).querySelectorAll('figure');
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if (figures.length) {
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let currentGallery = [figures[0]];
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for (let i = 1; i < figures.length; ++i) {
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if (figures[i].previousElementSibling === currentGallery[currentGallery.length - 1]) {
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/* Adjacent */
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currentGallery.push(figures[i]);
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}
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else {
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/* End gallery */
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wrap(currentGallery);
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currentGallery = [figures[i]];
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}
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}
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if (currentGallery.length > 0) {
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wrap(currentGallery);
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}
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/**
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* Load PhotoSwipe library, and then initialize
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*/
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loadPhotoSwipe().then(() => {
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const pswp = document.querySelector('.pswp') as HTMLDivElement;
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pswp.style.removeProperty('display');
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initPhotoSwipeFromDOM(`${selector} .gallery`);
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})
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}
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}
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export {
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createGallery
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}
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