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path: root/_includes/extensions/photo-swipe.html
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<script src="//cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe-ui-default.min.js"></script>
<link
  href="https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/photoswipe.css"
  rel="stylesheet"
/>
<link
  href="https://cdnjs.cloudflare.com/ajax/libs/photoswipe/4.1.3/default-skin/default-skin.css"
  rel="stylesheet"
/>
<style>
  .pswp .pswp__container .pswp__img {
    background-color: white;
  }
</style>

<script>
  function initPhotoSwipe() {
    const selectors = '{{ site.photo_previewer.photo_selectors || join: "," }}'
      .split(",")
      .filter((item) => item.length > 0);

    // Default selector
    if (selectors.length === 0) {
      selectors.push("section.main");
    }

    const areaEls = [];
    selectors.forEach((selector) => {
      const el = document.querySelector(selector);
      if (el) {
        areaEls.push(el);
      }
    });

    const imgEls = [];

    areaEls.forEach((areaEl) => {
      var els = areaEl.querySelectorAll("img:not(.emoji)");
      els.forEach((el) => {
        if (!imgEls.includes(el)) {
          imgEls.push(el);
        }
      });
    });

    if (imgEls.length === 0) {
      return;
    }

    const photo_scale = '{{ site.photo_previewer.photo_scale }}';
    const background_opacity = '{{ site.photo_previewer.background_opacity }}';
    const previewer_options = {
      photo_scale: photo_scale.length > 0 ? parseFloat(photo_scale) : 2,
      background_opacity: background_opacity.length > 0 ?
      parseFloat(background_opacity) : 0.85,
    };

    imgEls.forEach((imgEl) => {
      imgEl.outerHTML = `
      <a class="photo-swipe"
        href="${imgEl.src}"
        data-width="${
          Math.max(imgEl.naturalWidth, imgEl.width) *
          previewer_options.photo_scale
        }"
        data-height="${
          Math.max(imgEl.naturalHeight, imgEl.height) *
          previewer_options.photo_scale
        }"
        data-caption="${imgEl.getAttribute("caption") || imgEl.alt}"
        target="_blank">
        ${imgEl.outerHTML}
      </a>`;
    });

    // Init empty gallery array
    var container = [];

    // Loop over gallery items and push it to the array
    var linkEls = document.querySelectorAll("a.photo-swipe");
    linkEls.forEach((link) => {
      var item = {
        src: link.getAttribute("href"),
        w: link.dataset.width,
        h: link.dataset.height,
        title: link.dataset.caption || "",
      };
      container.push(item);
    });

    // Define click event on gallery item
    linkEls.forEach((link, index) => {
      link.addEventListener("click", (event) => {
        // Prevent location change
        event.preventDefault();

        // Define object and gallery options
        var pswp = document.querySelector(".pswp");

        var zoomLevel = 1;

        // Define object and gallery options
        var options = {
          index: index,
          bgOpacity: previewer_options.background_opacity,
          showHideOpacity: true,
          closeOnScroll: true,
          getDoubleTapZoom: (isMouseClick, item) => {
            if (item.detail) {
              zoomLevel += item.detail.origEvent.shiftKey ? -1 : 1;
              item.detail = undefined;
            } else {
              zoomLevel = zoomLevel === 1 ? 2 : 1;
            }
            if (zoomLevel <= 1) {
              zoomLevel = 1;
              setTimeout(() => pswp.classList.remove("pswp--zoomed-in"), 0);
            }
            return item.initialZoomLevel * zoomLevel;
          },
        };

        // Initialize PhotoSwipe
        var gallery = new PhotoSwipe(
          pswp,
          PhotoSwipeUI_Default,
          container,
          options
        );

        gallery.init();

        // Custom zoom event
        gallery.container.addEventListener("pswpTap", (e) => {
          gallery.currItem.detail = e.detail;
        });
      });
    });
  }

  window.addEventListener("load", initPhotoSwipe);
</script>

<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
  <!-- Background of PhotoSwipe.
           It's a separate element as animating opacity is faster than rgba(). -->
  <div class="pswp__bg"></div>
  <!-- Slides wrapper with overflow:hidden. -->
  <div class="pswp__scroll-wrap">
    <!-- Container that holds slides.
              PhotoSwipe keeps only 3 of them in the DOM to save memory.
              Don't modify these 3 pswp__item elements, data is added later on. -->
    <div class="pswp__container">
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
    </div>
    <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
    <div class="pswp__ui pswp__ui--hidden">
      <div class="pswp__top-bar">
        <!--  Controls are self-explanatory. Order can be changed. -->
        <div class="pswp__counter"></div>
        <button
          class="pswp__button pswp__button--close"
          title="Close (Esc)"
        ></button>
        <button class="pswp__button pswp__button--share" title="Share"></button>
        <button
          class="pswp__button pswp__button--fs"
          title="Toggle fullscreen"
        ></button>
        <button
          class="pswp__button pswp__button--zoom"
          title="Zoom in/out"
        ></button>
        <!-- element will get class pswp__preloader--active when preloader is running -->
        <div class="pswp__preloader">
          <div class="pswp__preloader__icn">
            <div class="pswp__preloader__cut">
              <div class="pswp__preloader__donut"></div>
            </div>
          </div>
        </div>
      </div>
      <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
        <div class="pswp__share-tooltip"></div>
      </div>
      <button
        class="pswp__button pswp__button--arrow--left"
        title="Previous (arrow left)"
      ></button>
      <button
        class="pswp__button pswp__button--arrow--right"
        title="Next (arrow right)"
      ></button>
      <div class="pswp__caption">
        <div class="pswp__caption__center"></div>
      </div>
    </div>
  </div>
</div>