add config dialog

include/config/dialog.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef LAB_DIALOG_H
+#define LAB_DIALOG_H
+
+struct wlr_scene_node;
+
+/**
+ * dialog_create_callback - creates the config dialog,
+ * used with wl_event_loop_add_idle.
+ *
+ * @data: Ignored.
+ */
+void dialog_create_callback(void *data);
+
+/**
+ * dialog_destroy - destroys a dialog that is a child of
+ * server.dialog_tree, destroys all children if NULL is provided.
+ *
+ * @dialog: Dialog to be destroyed
+ */
+void dialog_destroy(struct wlr_scene_node *dialog);
+
+#endif /* LAB_DIALOG_H */