From aeceb94219e8fa4c3150dbf349228af331356dac Mon Sep 17 00:00:00 2001
From: Lim Chee Aun <cheeaun@gmail.com>
Date: Sun, 11 Dec 2022 14:35:57 +0800
Subject: [PATCH] Fix carousel actually not working properly

- Need intersection observer to tell JS that scroll snap happened
- Fix carousel dots not working
- Add fancy background overlay based on image average color
- Disable fade out if open in carousel
---
 src/app.css               | 16 +++++++++++++--
 src/components/status.jsx | 43 +++++++++++++++++++++++++++++----------
 src/index.css             |  5 ++++-
 3 files changed, 50 insertions(+), 14 deletions(-)

diff --git a/src/app.css b/src/app.css
index 42ef6e3c..d83c3737 100644
--- a/src/app.css
+++ b/src/app.css
@@ -349,7 +349,8 @@ a.hashtag {
   pointer-events: none;
 }
 
-button.carousel-button {
+button.carousel-button,
+button.carousel-dot {
   pointer-events: auto;
   font-weight: bold;
 }
@@ -360,7 +361,12 @@ button.carousel-button[hidden] {
 }
 .carousel-dots {
   border-radius: 999px;
-  backdrop-filter: blur(12px);
+  backdrop-filter: blur(12px) invert(.25) brightness(1.5);
+}
+@media (prefers-color-scheme: dark) {
+  .carousel-dots {
+    backdrop-filter: blur(12px) brightness(.5);
+  }
 }
 button.carousel-dot {
   color: var(--text-insignificant-color) !important;
@@ -392,6 +398,12 @@ button.carousel-dot.active {
     transform: translateY(0);
   }
 }
+@media (prefers-color-scheme: dark) {
+  .carousel :is(img, video) {
+    /* No need fade out if inside carousel */
+    filter: none;
+  }
+}
 
 /* COMPOSE BUTTON */
 
diff --git a/src/components/status.jsx b/src/components/status.jsx
index 11b4d758..bbf20c31 100644
--- a/src/components/status.jsx
+++ b/src/components/status.jsx
@@ -3,6 +3,7 @@ import './status.css';
 import { getBlurHashAverageColor } from 'fast-blurhash';
 import mem from 'mem';
 import { useEffect, useRef, useState } from 'preact/hooks';
+import { InView } from 'react-intersection-observer';
 import { useSnapshot } from 'valtio';
 
 import Modal from '../components/modal';
@@ -477,7 +478,7 @@ function Status({ statusID, status, withinContext, size = 'm', skeleton }) {
   const prevShowMediaModal = useRef(showMediaModal);
   useEffect(() => {
     if (showMediaModal !== false) {
-      carouselFocusItem.current?.scrollIntoView({
+      carouselFocusItem.current?.node?.scrollIntoView({
         behavior: prevShowMediaModal.current === false ? 'auto' : 'smooth',
       });
     }
@@ -498,6 +499,8 @@ function Status({ statusID, status, withinContext, size = 'm', skeleton }) {
 
   const [actionsUIState, setActionsUIState] = useState(null); // boost-loading, favourite-loading, bookmark-loading
 
+  const carouselRef = useRef(null);
+
   return (
     <div
       class={`status ${
@@ -802,6 +805,7 @@ function Status({ statusID, status, withinContext, size = 'm', skeleton }) {
       {showMediaModal !== false && (
         <Modal>
           <div
+            ref={carouselRef}
             class="carousel"
             onClick={(e) => {
               if (
@@ -813,16 +817,33 @@ function Status({ statusID, status, withinContext, size = 'm', skeleton }) {
             }}
             tabindex="0"
           >
-            {mediaAttachments?.map((media, i) => (
-              <div
-                class="carousel-item"
-                tabindex="0"
-                key={media.id}
-                ref={i === showMediaModal ? carouselFocusItem : null}
-              >
-                <Media media={media} showOriginal />
-              </div>
-            ))}
+            {mediaAttachments?.map((media, i) => {
+              const { blurhash } = media;
+              const rgbAverageColor = blurhash
+                ? getBlurHashAverageColor(blurhash)
+                : null;
+              return (
+                <InView
+                  class="carousel-item"
+                  style={{
+                    backgroundColor: `rgba(${rgbAverageColor.join(',')}, .5)`,
+                  }}
+                  tabindex="0"
+                  key={media.id}
+                  ref={i === showMediaModal ? carouselFocusItem : null}
+                  // InView options
+                  root={carouselRef.current}
+                  threshold={1}
+                  onChange={(inView) => {
+                    if (inView) {
+                      setShowMediaModal(i);
+                    }
+                  }}
+                >
+                  <Media media={media} showOriginal />
+                </InView>
+              );
+            })}
           </div>
           <div class="carousel-top-controls">
             <span />
diff --git a/src/index.css b/src/index.css
index 79597a49..39ac54c3 100644
--- a/src/index.css
+++ b/src/index.css
@@ -123,7 +123,7 @@ button > * {
 :is(button, .button).plain {
   background-color: transparent;
   color: var(--link-color);
-  backdrop-filter: blur(12px);
+  backdrop-filter: blur(12px) invert(.25) brightness(1.5);
 }
 :is(button, .button).light {
   background-color: var(--bg-faded-color);
@@ -170,6 +170,9 @@ select.plain {
   img:hover, video:hover {
     filter: brightness(1);
   }
+  :is(button, .button).plain {
+    backdrop-filter: blur(12px) brightness(.5);
+  }
 }
 
 /* UTILS */