119 lines
3.5 KiB
JavaScript
119 lines
3.5 KiB
JavaScript
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(function(Gallery) {
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var galleryTimer, galleryMode;
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Gallery.step = function (items, iterations) {
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var length = items.length,
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ptr = 0,
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loops = 0;
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return function () {
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if (iterations > 0 && loops === iterations) {
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return;
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}
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items[ptr].className = "inactive";
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if (ptr === length - 1) {
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loops++;
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if (iterations === 0 || loops < iterations) {
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ptr = 0;
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}
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} else {
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ptr++;
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}
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items[ptr].className = "active";
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};
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};
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Gallery.start = function (galleryNode, contextNode) {
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contextNode = contextNode || document.body.firstChild;
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galleryMode = galleryNode.dataset.mode || 'normal';
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if (galleryMode === 'full-screen') {
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// FIXME remove depenency on Reveal, have a callback? function
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// that will get a root node to move full screen slides to (ie. slidesNode)
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// for full screen mode we need to:
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// - take the gallery out of the flow and insert it before "slides"
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// - hide slides
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// - make it full screen
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var placeholder = document.createElement("div");
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placeholder.id = "gallery-placeholder";
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galleryNode.parentNode.replaceChild(placeholder, galleryNode);
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if (contextNode.parentNode) {
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contextNode.parentNode.insertBefore(galleryNode, contextNode);
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}
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}
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var items = Array.prototype.slice.apply(galleryNode.querySelectorAll("li"));
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items.forEach(function (item, index) {
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if (index === 0) {
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item.className = "active";
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} else {
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item.className = "inactive";
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}
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var label = item.querySelector("label");
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var img = item.querySelector("img");
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if (galleryMode === 'full-screen') {
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img.style.display = "none";
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item.style.backgroundImage = "url(" + img.src + ")";
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} else {
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img.style.display = "";
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}
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if (!label && img.attributes.alt) {
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label = document.createElement("label");
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label.innerHTML = img.attributes.alt.value;
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item.appendChild(label);
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}
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});
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var iterations = galleryNode.dataset.iterations ? +galleryNode.dataset.iterations : 1;
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var interval = (galleryNode.dataset.interval || 1) * 1000;
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galleryTimer = setInterval(Gallery.step(items, iterations), interval);
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};
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// FIXME Gallery.stop should take elem and root nodes as well
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Gallery.stop = function (galleryNode, contextNode) {
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clearInterval(galleryTimer);
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if (galleryMode === "full-screen") {
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// - put the gallery back where it was
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var placeholder = document.getElementById("gallery-placeholder");
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placeholder.parentNode.replaceChild(galleryNode, placeholder);
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var items = Array.prototype.slice.apply(galleryNode.querySelectorAll("li"));
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items.forEach(function (item, index) {
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var img = item.querySelector("img");
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item.style.backgroundImage = "";
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img.style.display = "";
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});
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}
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};
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})(window.Gallery = window.Gallery || {});(function() {
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if( typeof window.addEventListener === 'function' ) {
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var slidesNode = document.querySelector(".slides");
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Reveal.addEventListener("slidechanged", function (event) {
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console.log(event)
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var galleryNode = event.previousSlide.querySelector('.gallery') || document.querySelector('.reveal > .gallery');
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if (galleryNode) {
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Gallery.stop(galleryNode, slidesNode);
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}
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galleryNode = event.currentSlide.querySelector('.gallery');
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if (galleryNode) {
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Gallery.start(galleryNode, slidesNode);
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}
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});
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// during initial load
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if (Reveal.getCurrentSlide()) {
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var galleryNode = Reveal.getCurrentSlide().querySelector('.gallery');
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if (galleryNode) {
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Gallery.start(galleryNode, slidesNode);
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}
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}
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}
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})();
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