#include <gtk/gtk.h>

static GtkWidget *mwindow = NULL;
static GtkWidget *mbutton = NULL;
static GtkWidget *mbutton_box = NULL;


static void
print_goodbye (GtkWidget *widget,
             gpointer   data)
{
	g_print ("good bye\n");
	if(mwindow != NULL)
	  gtk_widget_destroy(mwindow);
	mwindow = NULL;
}


static void
print_hello (GtkWidget *widget,
             gpointer   data)
{
  g_print ("Hello World\n");
  if(mwindow == NULL)
  {
    mwindow = gtk_window_new (GTK_WINDOW_TOPLEVEL);
	gtk_window_set_decorated(mwindow, FALSE);
    gtk_window_set_title (GTK_WINDOW (mwindow), "Window");
    gtk_window_set_default_size (GTK_WINDOW (mwindow), 400, 400);
  
    mbutton_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
    gtk_container_add (GTK_CONTAINER (mwindow), mbutton_box);
  
    mbutton = gtk_button_new_with_label ("Hello World");
    g_signal_connect (mbutton, "clicked", G_CALLBACK (print_goodbye), NULL);
//    g_signal_connect_swapped (mbutton, "clicked", G_CALLBACK (gtk_widget_destroy), mwindow);
    gtk_container_add (GTK_CONTAINER (mbutton_box), mbutton);
  
    gtk_widget_show_all (mwindow);
  }

}

static void
activate (GtkApplication *app,
          gpointer        user_data)
{
  GtkWidget *window;
  GtkWidget *button;
  GtkWidget *button_box;

  window = gtk_application_window_new (app);
  gtk_window_set_decorated(window, FALSE);
  gtk_window_set_title (GTK_WINDOW (window), "Window");
  gtk_window_set_default_size (GTK_WINDOW (window), 200, 200);

  button_box = gtk_button_box_new (GTK_ORIENTATION_HORIZONTAL);
  gtk_container_add (GTK_CONTAINER (window), button_box);

  button = gtk_button_new_with_label ("Hello World");
  g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
//  g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
  gtk_container_add (GTK_CONTAINER (button_box), button);

  gtk_widget_show_all (window);
}

int
main (int    argc,
      char **argv)
{
  GtkApplication *app;
  int status;

  app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
  g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
  status = g_application_run (G_APPLICATION (app), argc, argv);
  g_object_unref (app);

  return status;
}
