Initial revision

src/window-helper.h

@@ -0,0 +1,16 @@
+// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "alsa.h"
+
+gboolean window_startup_close_request(GtkWindow *w, gpointer data);
+
+GtkWidget *create_subwindow(
+  struct alsa_card *card,
+  const char       *name,
+  GCallback         close_callback
+);