diff -r b9767cb5b06b -r d2bd73d28ff1 ui/gtk/container.c
--- a/ui/gtk/container.c	Fri Nov 29 22:21:36 2024 +0100
+++ b/ui/gtk/container.c	Thu Dec 12 20:01:43 2024 +0100
@@ -891,6 +891,42 @@
 
 #endif
 
+/* -------------------- Sidebar -------------------- */
+
+#ifdef UI_LIBADWAITA
+UIWIDGET ui_sidebar_create(UiObject *obj, UiSidebarArgs args) {
+    GtkWidget *sidebar_toolbar_view = g_object_get_data(G_OBJECT(obj->widget), "ui_sidebar");
+    if(!sidebar_toolbar_view) {
+        fprintf(stderr, "Error: window is not configured for sidebar\n");
+        return NULL;
+    }
+    
+    GtkWidget *box = ui_gtk_vbox_new(args.spacing);
+    ui_box_set_margin(box, args.margin);
+    adw_toolbar_view_set_content(ADW_TOOLBAR_VIEW(sidebar_toolbar_view), box);
+    
+    UiObject *newobj = uic_object_new(obj, box);
+    newobj->container = ui_box_container(obj, box, UI_CONTAINER_VBOX);
+    uic_obj_add(obj, newobj);
+    
+    return box;
+}
+#else
+UIWIDGET ui_sidebar_create(UiObject *obj, UiSidebarArgs args) {
+    GtkWidget *sidebar_vbox = g_object_get_data(G_OBJECT(obj->widget), "ui_sidebar");
+    
+    GtkWidget *box = ui_gtk_vbox_new(args.spacing);
+    ui_box_set_margin(box, args.margin);
+    BOX_ADD_EXPAND(sidebar_vbox, box);
+    
+    UiObject *newobj = uic_object_new(obj, box);
+    newobj->container = ui_box_container(obj, box, UI_CONTAINER_VBOX);
+    uic_obj_add(obj, newobj);
+    
+    return box;
+}
+#endif
+
 /* -------------------- Splitpane -------------------- */
 
 static GtkWidget* create_paned(UiOrientation orientation) {