XFCE panel plugin body

plugin_body.c

static void
constructor(XfcePanelPlugin *plugin) {
    // Use any GTK_CONTAINER you wish, it will be packed into the XfcePanelPlugin (plugin) variable.
    GtkWidget *scroll_win = gtk_scrolled_window_new(NULL, NULL);
   
    /* Now program as if you were creating any old GTK application. */

    // Pack your container into the plugin's container.
    gtk_container_add(GTK_CONTAINER(plugin), scroll_win);

    // Run these commands so GTK shows your widgets.
    gtk_widget_show_all(scroll_win); // change scroll_win to your container's name
    xfce_panel_plugin_set_expand (XFCE_PANEL_PLUGIN(plugin), TRUE); // nothing to change here
}