feat: fullscreen images slideshow (#1120)

frontend/src/static/js/components/media-viewer/ImageViewer.js

@@ -1,8 +1,10 @@
 import React, { useContext, useEffect, useState } from 'react';
 import { SiteContext } from '../../utils/contexts/';
 import { MediaPageStore } from '../../utils/stores/';
+import { SpinnerLoader } from '../_shared';
+import Tooltip from '../_shared/ToolTip';
 
-export default function ImageViewer(props) {
+export default function ImageViewer() {
   const site = useContext(SiteContext);
 
   let initialImage = getImageUrl();
@@ -11,6 +13,12 @@ export default function ImageViewer(props) {
   initialImage = initialImage ? initialImage : '';
 
   const [image, setImage] = useState(initialImage);
+  const [slideshowItems, setSlideshowItems] = useState([]);
+  const [isModalOpen, setIsModalOpen] = useState(false);
+  const [currentIndex, setCurrentIndex] = useState(0);
+  const [isImgLoading, setIsImgLoading] = useState(true);
+
+  const thumbnailRef = React.useRef();
 
   function onImageLoad() {
     setImage(getImageUrl());
@@ -19,34 +27,142 @@ export default function ImageViewer(props) {
   function getImageUrl() {
     const media_data = MediaPageStore.get('media-data');
 
-    let imgUrl = 'string' === typeof media_data.poster_url ? media_data.poster_url.trim() : '';
-
-    if ('' === imgUrl) {
-      imgUrl = 'string' === typeof media_data.thumbnail_url ? media_data.thumbnail_url.trim() : '';
-    }
-
-    if ('' === imgUrl) {
-      imgUrl =
-        'string' === typeof MediaPageStore.get('media-original-url')
-          ? MediaPageStore.get('media-original-url').trim()
-          : '';
-    }
-
-    if ('' === imgUrl) {
-      return '#';
-    }
+    let imgUrl =
+      media_data.poster_url?.trim() ||
+      media_data.thumbnail_url?.trim() ||
+      MediaPageStore.get('media-original-url')?.trim() ||
+      '#';
 
     return site.url + '/' + imgUrl.replace(/^\//g, '');
   }
 
+  const fetchSlideShowItems = () => {
+    const media_data = MediaPageStore.get('media-data');
+    const items = media_data.slideshow_items;
+    if (Array.isArray(items)) {
+      setSlideshowItems(items);
+    }
+  };
+
+  useEffect(() => {
+    if (image) {
+      fetchSlideShowItems();
+    }
+  }, [image]);
+
   useEffect(() => {
     MediaPageStore.on('loaded_image_data', onImageLoad);
     return () => MediaPageStore.removeListener('loaded_image_data', onImageLoad);
   }, []);
 
+  useEffect(() => {
+    if (!isModalOpen) return;
+
+    document.addEventListener('keydown', handleKeyDown);
+
+    return () => {
+      document.removeEventListener('keydown', handleKeyDown);
+    };
+  }, [isModalOpen, slideshowItems]);
+
+  const handleKeyDown = (event) => {
+    if (event.key === 'ArrowRight') handleNext();
+    if (event.key === 'ArrowLeft') handlePrevious();
+    if (event.key === 'Escape') onClose();
+  };
+
+  const onClose = () => setIsModalOpen(false);
+
+  const handleNext = () => {
+    setIsImgLoading(true);
+    setCurrentIndex((prevIndex) => (prevIndex + 1) % slideshowItems.length);
+  };
+
+  const handlePrevious = () => {
+    setIsImgLoading(true);
+    setCurrentIndex((prevIndex) => (prevIndex - 1 + slideshowItems.length) % slideshowItems.length);
+  };
+
+  const handleDotClick = (index) => {
+    setIsImgLoading(true);
+    setCurrentIndex(index);
+  };
+
+  const handleImageClick = (index) => {
+    const mediaPageUrl = site.url + slideshowItems[index]?.url;
+    window.location.href = mediaPageUrl;
+  };
+
+  const scrollThumbnails = (direction) => {
+    if (thumbnailRef.current) {
+      const scrollAmount = 10;
+      if (direction === 'left') {
+        thumbnailRef.current.scrollBy({ left: -scrollAmount, behavior: 'smooth' });
+      } else if (direction === 'right') {
+        thumbnailRef.current.scrollBy({ left: scrollAmount, behavior: 'smooth' });
+      }
+    }
+  };
+
   return !image ? null : (
     <div className="viewer-image-container">
-      <img src={image} alt={MediaPageStore.get('media-data').title || null} />
+      <Tooltip content={'load full-image'} position="center">
+        <img src={image} alt={MediaPageStore.get('media-data').title || null} onClick={() => setIsModalOpen(true)} />
+      </Tooltip>
+      {isModalOpen && slideshowItems && (
+        <div className="modal-overlay" onClick={() => setIsModalOpen(false)}>
+          <div className="slideshow-container" onClick={(e) => e.stopPropagation()}>
+            {!isImgLoading && (
+              <button className="arrow left" onClick={handlePrevious} aria-label="Previous slide">
+                &#8249;
+              </button>
+            )}
+            <div className="slideshow-image">
+              {isImgLoading && <SpinnerLoader size="large" />}
+              <img
+                src={site.url + '/' + slideshowItems[currentIndex]?.original_media_url}
+                alt={`Slide ${currentIndex + 1}`}
+                onClick={() => handleImageClick(currentIndex)}
+                onLoad={() => setIsImgLoading(false)}
+                onError={() => setIsImgLoading(false)}
+                style={{ display: isImgLoading ? 'none' : 'block' }}
+              />
+              {!isImgLoading && <div className="slideshow-title">{slideshowItems[currentIndex]?.title}</div>}
+            </div>
+            {!isImgLoading && (
+              <button className="arrow right" onClick={handleNext} aria-label="Next slide">
+                &#8250;
+              </button>
+            )}
+            <div className="thumbnail-navigation">
+              {slideshowItems.length > 5 && (
+                <button className="arrow left" onClick={() => scrollThumbnails('left')} aria-label="Scroll left">
+                  &#8249;
+                </button>
+              )}
+              <div
+                className={`thumbnail-container ${slideshowItems.length <= 5 ? 'center-thumbnails' : ''}`}
+                ref={thumbnailRef}
+              >
+                {slideshowItems.map((item, index) => (
+                  <img
+                    key={index}
+                    src={site.url + '/' + item.thumbnail_url}
+                    alt={`Thumbnail ${index + 1}`}
+                    className={`thumbnail ${currentIndex === index ? 'active' : ''}`}
+                    onClick={() => handleDotClick(index)}
+                  />
+                ))}
+              </div>
+              {slideshowItems.length > 5 && (
+                <button className="arrow right" onClick={() => scrollThumbnails('right')} aria-label="Scroll right">
+                  &#8250;
+                </button>
+              )}
+            </div>
+          </div>
+        </div>
+      )}
     </div>
   );
 }