added image preloader to swiper

src/components/common/ImageLoadingWrapper/index.tsx

@@ -0,0 +1,52 @@
+import React, {
+  CSSProperties,
+  FC,
+  useCallback,
+  useMemo,
+  useReducer,
+  useState,
+} from 'react';
+
+import classNames from 'classnames';
+
+import { LoaderCircle } from '~/components/input/LoaderCircle';
+import { DivProps } from '~/utils/types';
+
+import styles from './styles.module.scss';
+
+interface ImageLoadingWrapperProps extends Omit<DivProps, 'children'> {
+  children: (props: { loading: boolean; onLoad: () => void }) => void;
+  preview?: string;
+}
+
+const ImageLoadingWrapper: FC<ImageLoadingWrapperProps> = ({
+  className,
+  children,
+  preview,
+  color,
+  ...props
+}) => {
+  const [loading, onLoad] = useReducer((v) => false, true);
+
+  const style = useMemo<CSSProperties>(
+    () => ({
+      backgroundImage: `url('${preview}')`,
+      backgroundColor: color || 'var(--color-primary)',
+    }),
+    [preview, color],
+  );
+
+  return (
+    <div className={classNames(styles.wrapper, className)} {...props}>
+      {!!loading && !!preview && (
+        <div className={styles.preview}>
+          <div className={styles.thumbnail} style={style} />
+          <LoaderCircle size={32} />
+        </div>
+      )}
+      {children({ loading, onLoad })}
+    </div>
+  );
+};
+
+export { ImageLoadingWrapper };

src/components/common/ImageLoadingWrapper/styles.module.scss

@@ -0,0 +1,26 @@
+@import 'src/styles/variables';
+
+.wrapper {
+  position: relative;
+}
+
+.preview {
+  position: absolute;
+  inset: 0;
+  pointer-events: none;
+  touch-action: none;
+  display: flex;
+  align-items: flex-end;
+  justify-content: flex-end;
+  padding: $gap;
+}
+
+.thumbnail {
+  filter: blur(10px);
+  position: absolute;
+  inset: 0;
+  border-radius: $radius;
+  background-size: cover;
+  background-position: 50% 50%;
+  box-sizing: border-box;
+}

src/components/node/NodeImageSwiperBlock/index.tsx

@@ -12,12 +12,14 @@ import SwiperCore, {
 import { Swiper, SwiperSlide } from 'swiper/react';
 import SwiperClass from 'swiper/types/swiper-class';
 
-import { ImagePreloader } from '~/components/media/ImagePreloader';
+import { ImageLoadingWrapper } from '~/components/common/ImageLoadingWrapper/index';
 import { INodeComponentProps } from '~/constants/node';
+import { imagePresets } from '~/constants/urls';
 import { useModal } from '~/hooks/modal/useModal';
 import { useImageModal } from '~/hooks/navigation/useImageModal';
 import { useNodeImages } from '~/hooks/node/useNodeImages';
 import { normalizeBrightColor } from '~/utils/color';
+import { getURL } from '~/utils/dom';
 import { getFileSrcSet } from '~/utils/srcset';
 
 import styles from './styles.module.scss';
@@ -101,18 +103,6 @@ const NodeImageSwiperBlock: FC<IProps> = observer(({ node }) => {
     return null;
   }
 
-  if (images.length === 1) {
-    return (
-      <div className={styles.single}>
-        <ImagePreloader
-          file={images[0]}
-          onClick={() => onOpenPhotoSwipe(0)}
-          className={styles.image}
-        />
-      </div>
-    );
-  }
-
   return (
     <div className={styles.wrapper}>
       <Swiper
@@ -137,20 +127,28 @@ const NodeImageSwiperBlock: FC<IProps> = observer(({ node }) => {
         watchSlidesProgress
         lazy={lazy}
       >
-        {images.map((file, i) => (
+        {images.map((file, index) => (
           <SwiperSlide className={styles.slide} key={file.id}>
+            <ImageLoadingWrapper
+              preview={getURL(file, imagePresets['300'])}
+              color={file.metadata?.dominant_color}
+            >
+              {({ loading, onLoad }) => (
                 <img
-              style={{ backgroundColor: file.metadata?.dominant_color }}
                   data-srcset={getFileSrcSet(file)}
                   width={file.metadata?.width}
                   height={file.metadata?.height}
-              onLoad={updateSwiper}
+                  onLoad={onLoad}
-              onClick={() => onOpenPhotoSwipe(i)}
+                  onClick={() => onOpenPhotoSwipe(index)}
-              className={classNames(styles.image, 'swiper-lazy')}
+                  className={classNames(styles.image, 'swiper-lazy', {
+                    [styles.loading]: loading,
+                  })}
                   color={normalizeBrightColor(file?.metadata?.dominant_color)}
                   alt=""
                   sizes="(max-width: 560px) 100vw, 50vh"
                 />
+              )}
+            </ImageLoadingWrapper>
           </SwiperSlide>
         ))}
       </Swiper>

src/components/node/NodeImageSwiperBlock/styles.module.scss

@@ -124,6 +124,10 @@
   transition: box-shadow 1s;
   box-shadow: transparentize(black, 0.7) 0 3px 5px;
 
+  &.loading {
+    opacity: 0;
+  }
+
   :global(.swiper-slide-active) & {
     box-shadow: transparentize(black, 0.9) 0 10px 5px 4px,
       transparentize(black, 0.7) 0 5px 5px, $gray_90 0 -1px 2px, $gray_90 0 -1px;