gui/assets/main.scss

@@ -83,6 +83,44 @@ a:visited {
   }
 }
 
+
+.channel_header {
+    display: flex;
+    flex-direction: row;
+    align-items: center;
+}
+
+.channel_arrow {
+    width: 1em;
+    text-align: center;
+    margin-right: 0.25rem;
+}
+
+.channel_arrow--placeholder {
+    pointer-events: none;
+    visibility: hidden;
+}
+
+/* The whole right side of the row is the dblclick target */
+.channel_row_click {
+    flex: 1;
+    padding: 0.1rem 0.25rem 0.1rem 0.5rem;
+    cursor: pointer;
+}
+
+/* Hover highlight for whole row area (title + blank space) */
+.channel_row_click:hover {
+    background-color: var(--channel-hover-bg, #222); /* pick your color */
+}
+
+
+/* still keep text non-selectable if desired */
+.channel_details {
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
+}
+
 .channel {
   &_details {
     flex: 0 0 100%;

gui/src/app.rs

@@ -291,22 +291,53 @@ pub fn Channel(id: ChannelId) -> Element {
         return rsx!("missing channel {id}");
     };
 
+    let mut open = use_signal(|| true);
+
+    let has_children = !state.users.is_empty() || !state.children.is_empty();
+
     rsx!(
-        details {
+        div {
             class: "channel_details",
-            open: true,
-            summary {
+
+            div {
+                class: "channel_header",
+                // Arrow: only toggles open
+                if has_children {
                     span {
-                    role: "button",
-                    ondoubleclick: move |evt| {
+                        class: "channel_arrow",
+                        onclick: move |evt| {
+                            evt.stop_propagation();
+                            evt.prevent_default();
+                            let mut w = open.write();
+                            *w = !*w;
+                        },
+                        if *open.read() { "▾" } else { "▸" }
+                    }
+                } else {
+                    span {
+                        class: "channel_arrow channel_arrow--placeholder",
+                        " "
+                    }
+                }
+
+                // Clickable row area (everything except the arrow)
+                div {
+                    class: "channel_row_click",
+                    ondblclick: move |evt| {
                         evt.stop_propagation();
                         evt.prevent_default();
                         net.send(EnterChannel { channel: id, user })
                     },
+                    // remove dblclick from the inner span
+                    span {
+                        class: "channel_title",
                         "{state.name}"
                     }
+                    // if you add icons/badges later, put them here too
                 }
-            if state.users.len() + state.children.len() > 0 {
+            }
+
+            if *open.read() && has_children {
                 div {
                     class: "channel_children",
                     for id in state.users.iter() {