From 03ea17117db4dd00e3dd38984389181c2c0faa2f Mon Sep 17 00:00:00 2001
From: Jeffrey Tse <jeffreytse.mail@gmail.com>
Date: Fri, 30 Jun 2023 22:52:04 +0800
Subject: feat: upgrade photo previewer to PhotoSwipe 5 (#115)

---
 _config.yml                           |  14 ++-
 _includes/extensions/photo-swipe.html | 203 +++++++---------------------------
 2 files changed, 48 insertions(+), 169 deletions(-)

diff --git a/_config.yml b/_config.yml
index 981fa59..40d9762 100644
--- a/_config.yml
+++ b/_config.yml
@@ -183,11 +183,17 @@ yat:
 # Pagination setting
 # paginate: 5
 
-# Photo previewer settings
+# Photo previewer settings (PhotoSwipe 5)
+# the options please refer to: https://photoswipe.com/options/
 # photo_previewer:
-#   photo_selectors: "section.main"  # Preview specified areas of photos by CSS selectors (It also can be an array)
-#   photo_scale: 2            # Adjust the preview scale of photos
-#   background_opacity: 0.85  # Background backdrop opacity
+#  gallery: "section.main"
+#  children: "a.photo-swipe"
+#  bgOpacity: 0.8
+#  padding:
+#    top: 20
+#    bottom: 40
+#    left: 100
+#    right: 100
 
 # Disqus comments
 # disqus:
diff --git a/_includes/extensions/photo-swipe.html b/_includes/extensions/photo-swipe.html
index ec4b8a2..9a5a51c 100644
--- a/_includes/extensions/photo-swipe.html
+++ b/_includes/extensions/photo-swipe.html
@@ -1,11 +1,7 @@
-<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>
+<script src="//cdnjs.cloudflare.com/ajax/libs/photoswipe/5.3.7/umd/photoswipe-lightbox.umd.min.js"></script>
+<script src="//cdnjs.cloudflare.com/ajax/libs/photoswipe/5.3.7/umd/photoswipe.umd.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"
+  href="//cdnjs.cloudflare.com/ajax/libs/photoswipe/5.3.7/photoswipe.min.css"
   rel="stylesheet"
 />
 <style>
@@ -16,188 +12,65 @@
 
 <script>
   function initPhotoSwipe() {
-    const selectors = '{{ site.photo_previewer.photo_selectors || join: "," }}'
-      .split(",")
-      .filter((item) => item.length > 0);
+    let customOptions = {};
 
-    // Default selector
-    if (selectors.length === 0) {
-      selectors.push("section.main");
+    try {
+      const data = `{{ site.photo_previewer }}`.replaceAll("=>", ":");
+      customOptions = JSON.parse(data);
+    } catch (e) {
+      console.error("Invalid custom photo previewer options! " + e.message);
     }
 
-    const areaEls = [];
-    selectors.forEach((selector) => {
-      const el = document.querySelector(selector);
-      if (el) {
-        areaEls.push(el);
-      }
-    });
+    // Define object and gallery options
+    const options = Object.assign(
+      {
+        gallery: "section.main",
+        children: "a.photo-swipe",
+        photo_scale: 2,
+        // dynamic import is not supported in UMD version
+        pswpModule: PhotoSwipe,
+      },
+      customOptions
+    );
+
+    const galleryEl = document.querySelector(options.gallery);
+    if (!galleryEl) {
+      return;
+    }
 
     const imgEls = [];
-
-    areaEls.forEach((areaEl) => {
-      var els = areaEl.querySelectorAll("img:not(.emoji)");
-      els.forEach((el) => {
-        if (!imgEls.includes(el)) {
-          imgEls.push(el);
-        }
-      });
+    const els = galleryEl.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-pswp-width="${
+          Math.max(imgEl.naturalWidth, imgEl.width) * options.photo_scale
         }"
-        data-height="${
-          Math.max(imgEl.naturalHeight, imgEl.height) *
-          previewer_options.photo_scale
+        data-pswp-height="${
+          Math.max(imgEl.naturalHeight, imgEl.height) * options.photo_scale
         }"
-        data-caption="${imgEl.getAttribute("caption") || imgEl.alt}"
+        data-pswp-caption="${imgEl.getAttribute("caption") || imgEl.alt}"
         target="_blank">
         ${imgEl.outerHTML}
       </a>`;
     });
 
-    // Init empty gallery array
-    var container = [];
+    // Initialize PhotoSwipe 5
+    var lightbox = new PhotoSwipeLightbox(options);
 
-    // 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;
-        });
-      });
-    });
+    lightbox.init();
   }
 
   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>
-- 
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