feat: add corresponding UI for interactions reactions

src/components/common/messaging/attachments/Reactions.tsx

@@ -2,6 +2,8 @@ import { observer } from "mobx-react-lite";
 import { Message } from "revolt.js";
 import styled, { css } from "styled-components";
 
+import { useCallback } from "preact/hooks";
+
 import { useClient } from "../../../../controllers/client/ClientController";
 import { RenderEmoji } from "../../../markdown/plugins/emoji";
 
@@ -9,18 +11,35 @@ interface Props {
     message: Message;
 }
 
+/**
+ * Reaction list element
+ */
 const List = styled.div`
     gap: 0.4em;
     display: flex;
     flex-wrap: wrap;
     margin-top: 0.2em;
+    align-items: center;
 `;
 
+/**
+ * List divider
+ */
+const Divider = styled.div`
+    width: 1px;
+    height: 14px;
+    background: var(--tertiary-foreground);
+`;
+
+/**
+ * Reaction styling
+ */
 const Reaction = styled.div<{ active: boolean }>`
     padding: 0.4em;
     cursor: pointer;
     user-select: none;
     vertical-align: middle;
+    border: 1px solid transparent;
     color: var(--secondary-foreground);
     border-radius: var(--border-radius);
     background: var(--secondary-background);
@@ -42,30 +61,73 @@ const Reaction = styled.div<{ active: boolean }>`
     ${(props) =>
         props.active &&
         css`
-            border: 1px solid var(--accent);
+            border-color: var(--accent);
         `}
 `;
 
+/**
+ * Render reactions on a message
+ */
 export const Reactions = observer(({ message }: Props) => {
     const client = useClient();
-    if (message.reactions.size === 0) return null;
 
-    return (
+    /**
-        <List>
+     * Render individual reaction entries
-            {Array.from(message.reactions, ([key, user_ids]) => {
+     */
-                const active = user_ids.has(client.user!._id);
+    const Entry = useCallback(
+        observer(({ id, user_ids }: { id: string; user_ids?: Set<string> }) => {
+            const active = user_ids?.has(client.user!._id) || false;
 
             return (
                 <Reaction
-                        key={key}
                     active={active}
                     onClick={() =>
-                            active ? message.unreact(key) : message.react(key)
+                        active ? message.unreact(id) : message.react(id)
                     }>
-                        <RenderEmoji match={key} /> {user_ids.size}
+                    <RenderEmoji match={id} /> {user_ids?.size || 0}
                 </Reaction>
             );
-            })}
+        }),
+        [],
+    );
+
+    /**
+     * Determine two lists of 'required' and 'optional' reactions
+     */
+    const { required, optional } = (() => {
+        const required = new Set<string>();
+        const optional = new Set<string>();
+
+        if (message.interactions?.reactions) {
+            for (const reaction of message.interactions.reactions) {
+                required.add(reaction);
+            }
+        }
+
+        for (const key of message.reactions.keys()) {
+            if (!required.has(key)) {
+                optional.add(key);
+            }
+        }
+
+        return {
+            required,
+            optional,
+        };
+    })();
+
+    // Don't render list if nothing is going to show anyways
+    if (required.size === 0 && optional.size === 0) return null;
+
+    return (
+        <List>
+            {Array.from(required, (id) => (
+                <Entry key={id} id={id} user_ids={message.reactions.get(id)} />
+            ))}
+            {required.size !== 0 && optional.size !== 0 && <Divider />}
+            {Array.from(optional, (id) => (
+                <Entry key={id} id={id} user_ids={message.reactions.get(id)} />
+            ))}
         </List>
     );
 });