#include <gtk/gtk.h>

/* I'm going to be lazy and use some global variables to

 * store the position of the widget within the fixed

 * container */

gint x = 50;

gint y = 50;

/* This callback function moves the button to a new position

 * in the Fixed container. */

static void move_button( GtkWidget *widget,

                         GtkWidget *fixed )

{

  x = (x + 30) % 300;

  y = (y + 50) % 300;

  gtk_fixed_move (GTK_FIXED (fixed), widget, x, y); 

}

int main( int   argc,

          char *argv[] )

{

  /* GtkWidget is the storage type for widgets */

  GtkWidget *window;

  GtkWidget *fixed;

  GtkWidget *button;

  gint i;

  /* Initialise GTK */

  gtk_init (&argc, &argv);

  /* Create a new window */

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  gtk_window_set_title (GTK_WINDOW (window), "Fixed Container");

  /* Here we connect the "destroy" event to a signal handler */ 

  g_signal_connect (G_OBJECT (window), "destroy",

		    G_CALLBACK (gtk_main_quit), NULL);

  /* Sets the border width of the window. */

  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  /* Create a Fixed Container */

  fixed = gtk_fixed_new ();

  gtk_container_add (GTK_CONTAINER (window), fixed);

  gtk_widget_show (fixed);

  for (i = 1 ; i <= 3 ; i++) {

    /* Creates a new button with the label "Press me" */

    button = gtk_button_new_with_label ("Press me");

    /* When the button receives the "clicked" signal, it will call the

     * function move_button() passing it the Fixed Container as its

     * argument. */

    g_signal_connect (G_OBJECT (button), "clicked",

		      G_CALLBACK (move_button), (gpointer) fixed);

    /* This packs the button into the fixed containers window. */

    gtk_fixed_put (GTK_FIXED (fixed), button, i*50, i*50);

    /* The final step is to display this newly created widget. */

    gtk_widget_show (button);

  }

  /* Display the window */

  gtk_widget_show (window);

  /* Enter the event loop */

  gtk_main ();

  return 0;

}