#include <gtk/gtk.h>

static void hello ( GtkWidget *widget, gpointer data )
{
    g_print("Hello World\n");
}

static gboolean delete_event (
        GtkWidget *widget, GdkEvent *event, gpointer data )
{
    g_print("delete event occurred\n");
    return TRUE;
}

static void destroy ( GtkWidget *widget, gpointer data )
{
    gtk_main_quit();
}

static gboolean window_state_event (
        GtkWidget *widget, GdkEvent *event, gpointer data )
{
    g_print("window state event occurred\n");
    return TRUE;
}

int main ( int argc, char *argv[] )
{
    GtkWidget *window;
    GtkWidget *button;

    gtk_init(&argc, &argv);

    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    g_signal_connect(window, "delete-event", G_CALLBACK(delete_event), NULL);
    g_signal_connect(window, "destroy", G_CALLBACK(destroy), NULL);
    g_signal_connect(
            window, "window-state-event", G_CALLBACK(window_state_event), NULL);
    gtk_container_set_border_width(GTK_CONTAINER(window), 10);

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

    gtk_widget_show(button);
    gtk_widget_show(window);

    gtk_main();

    return 0;
}