refactor

Author: ZhangHanDong

src/shared/mentionable_text_input.rs

@@ -551,24 +551,26 @@ impl MentionableTextInput {
                         // Special case for @room mention
                         let mut room_avatar_shown = false;
 
-                        if let Some(room_id) = &self.room_id {
-                            if let Some(known_room) = get_client().and_then(|c| c.get_room(room_id)) {
-                                if let Some(mxc_uri) = known_room.avatar_url() {
-                                    let owned_mxc = mxc_uri.to_owned();
-                                    if let AvatarCacheEntry::Loaded(avatar_data) = get_or_fetch_avatar(cx, owned_mxc) {
-                                        let _ = avatar.show_image(cx, None, |cx, img| {
-                                            utils::load_png_or_jpg(&img, cx, &avatar_data)
-                                        });
-                                        room_avatar_shown = true;
-                                    }
-                                }
-                            }
+                        if let Some(avatar_data) = self.room_id
+                            .as_ref()
+                            .and_then(|room_id| get_client().and_then(|c| c.get_room(room_id)))
+                            .and_then(|known_room| known_room.avatar_url())
+                            .map(|mxc_uri| mxc_uri.to_owned())
+                            .and_then(|owned_mxc| match get_or_fetch_avatar(cx, owned_mxc) {
+                                AvatarCacheEntry::Loaded(data) => Some(data),
+                                _ => None,
+                            }) {
+                            // show room avatar
+                            let _ = avatar.show_image(cx, None, |cx, img| {
+                                utils::load_png_or_jpg(&img, cx, &avatar_data)
+                            });
+                            room_avatar_shown = true;
                         }
 
                         // If room avatar couldn't be shown, display the text avatar with red background
                         if !room_avatar_shown {
                             avatar.show_text(cx, None, "Room");
-                            // Set avatar background to red for @room mentions
+                            // Set the text view's background color to red
                             avatar.view(id!(text_view)).apply_over(cx, live! {
                                 draw_bg: {
                                     background_color: #e24d4d