Hugo-theme-stack/assets/ts/gallery.ts

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2020-08-22 07:20:08 -04:00
import { loadScript, loadStyle } from './utils';
/**
* Init PhotoSwipe
* From: https://photoswipe.com/documentation/getting-started.html
* @param gallerySelector
*/
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);
}
};
/**
* Wrap adjacent figure tags with div.gallery, and append style
* Reference: https://github.com/xieranmaya/blog/issues/6
* @param gallery
*/
function wrap(gallery: HTMLElement[]) {
let galleryContainer = document.createElement('div');
galleryContainer.className = 'gallery';
let parentNode = gallery[0].parentNode,
first = gallery[0];
parentNode.insertBefore(galleryContainer, first)
for (let j = 0; j < gallery.length; ++j) {
const width = gallery[j].querySelector('img').width,
height = gallery[j].querySelector('img').height;
gallery[j].style.flexGrow = `${width * 100 / height}`;
gallery[j].style.flexBasis = `${width * 240 / height}px`;
galleryContainer.appendChild(gallery[j]);
}
}
/**
* Load PhotoSwipe library dynamically
*/
function loadPhotoSwipe() {
const tasks = [
loadScript("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.min.js"),
loadScript("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe-ui-default.min.js"),
loadStyle("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.min.css"),
loadStyle("https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/default-skin/default-skin.min.css")
];
return Promise.all(tasks);
}
/**
* Create gallery
* @param selector
*/
function createGallery(selector: string) {
const figures = document.querySelector(selector).querySelectorAll('figure');
if (figures.length) {
let currentGallery = [figures[0]];
for (let i = 1; i < figures.length; ++i) {
if (figures[i].previousElementSibling === currentGallery[currentGallery.length - 1]) {
/* Adjacent */
currentGallery.push(figures[i]);
}
else {
/* End gallery */
wrap(currentGallery);
currentGallery = [figures[i]];
}
}
if (currentGallery.length > 0) {
wrap(currentGallery);
}
/**
* Load PhotoSwipe library, and then initialize
*/
loadPhotoSwipe().then(() => {
const pswp = document.querySelector('.pswp') as HTMLDivElement;
pswp.style.removeProperty('display');
initPhotoSwipeFromDOM(`${selector} .gallery`);
})
}
}
export {
createGallery
}