//---------------------
//constructor of the Launcher class:

main->set_decorated(false);
main->set_resizable(false);
main->set_skip_taskbar_hint(true);
main->set_app_paintable(true);
main->set_type_hint(Gdk::WINDOW_TYPE_HINT_DOCK);

main->signal_draw().connect(sigc::mem_fun(*this, &Launcher::on_draw), false);
main->signal_realize().connect(sigc::mem_fun(*this,&Launcher::realized),false);
main->show_all();

//---------------------

void Launcher::realized(){
    debug("on_realize!")
    GdkScreen *screen = gtk_widget_get_screen (GTK_WIDGET (main->gobj()));
    GdkVisual *visual = gdk_screen_get_rgba_visual (screen);

    if (visual == NULL){
        debug("no alpha for you")
        visual = gdk_screen_get_system_visual (screen);
    }

    gtk_widget_set_visual (GTK_WIDGET(main->gobj()), visual);
}

//---------------------

bool Launcher::on_draw(const Cairo::RefPtr<Cairo::Context>& cr){
    debug("on_draw")
    cr->set_source_rgba (0.4f,0.4f,0.4f, 0.2f); /* transparent */
    cr->set_operator(Cairo::OPERATOR_SOURCE);
    cr->paint();
    //cr->destroy();
}