#include <stdlib.h>

#include <gtk/gtk.h>

static void selection_received( GtkWidget        *widget,

                                GtkSelectionData *selection_data,

                                gpointer          data );

/* Signal handler invoked when user clicks on the "Get Targets" button */

static void get_targets( GtkWidget *widget,

                         gpointer data )

{

  static GdkAtom targets_atom = GDK_NONE;

  GtkWidget *window = (GtkWidget *)data;

  /* Get the atom corresponding to the string "TARGETS" */

  if (targets_atom == GDK_NONE)

    targets_atom = gdk_atom_intern ("TARGETS", FALSE);

  /* And request the "TARGETS" target for the primary selection */

  gtk_selection_convert (window, GDK_SELECTION_PRIMARY, targets_atom,

			 GDK_CURRENT_TIME);

}

/* Signal handler called when the selections owner returns the data */

static void selection_received( GtkWidget        *widget,

                                GtkSelectionData *selection_data,

                                gpointer          data )

{

  GdkAtom *atoms;

  GList *item_list;

  int i;

  /* **** IMPORTANT **** Check to see if retrieval succeeded  */

  if (selection_data->length < 0)

    {

      g_print ("Selection retrieval failed\n");

      return;

    }

  /* Make sure we got the data in the expected form */

  if (selection_data->type != GDK_SELECTION_TYPE_ATOM)

    {

      g_print ("Selection \"TARGETS\" was not returned as atoms!\n");

      return;

    }

  /* Print out the atoms we received */

  atoms = (GdkAtom *)selection_data->data;

  item_list = NULL;

  for (i = 0; i < selection_data->length / sizeof(GdkAtom); i++)

    {

      char *name;

      name = gdk_atom_name (atoms[i]);

      if (name != NULL)

	g_print ("%s\n",name);

      else

	g_print ("(bad atom)\n");

    }

  return;

}

int main( int   argc,

          char *argv[] )

{

  GtkWidget *window;

  GtkWidget *button;

  gtk_init (&argc, &argv);

  /* Create the toplevel window */

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  gtk_window_set_title (GTK_WINDOW (window), "Event Box");

  gtk_container_set_border_width (GTK_CONTAINER (window), 10);

  g_signal_connect (window, "destroy",

	            G_CALLBACK (exit), NULL);

  /* Create a button the user can click to get targets */

  button = gtk_button_new_with_label ("Get Targets");

  gtk_container_add (GTK_CONTAINER (window), button);

  g_signal_connect (button, "clicked",

		    G_CALLBACK (get_targets), (gpointer) window);

  g_signal_connect (window, "selection-received",

		    G_CALLBACK (selection_received), NULL);

  gtk_widget_show (button);

  gtk_widget_show (window);

  gtk_main ();

  return 0;

}