--- /dev/null
+/* This is a file */
+
+#include <config.h>
+
+#include <gtk/gtk.h>
+
+/* This is a callback function. The data arguments are ignored
+ * in this example. More on callbacks below. */
+static void hello( GtkWidget *widget,
+ gpointer data )
+{
+ g_print ("Hello World\n");
+}
+
+static gboolean delete_event( GtkWidget *widget,
+ GdkEvent *event,
+ gpointer data )
+{
+ /* If you return FALSE in the "delete-event" signal handler,
+ * GTK will emit the "destroy" signal. Returning TRUE means
+ * you don't want the window to be destroyed.
+ * This is useful for popping up 'are you sure you want to quit?'
+ * type dialogs. */
+
+ g_print ("delete event occurred\n");
+
+ /* Change TRUE to FALSE and the main window will be destroyed with
+ * a "delete-event". */
+
+ return TRUE;
+}
+
+/* Another callback */
+static void destroy( GtkWidget *widget,
+ gpointer data )
+{
+ gtk_main_quit ();
+}
+
+int main( int argc,
+ char *argv[] )
+{
+ /* GtkWidget is the storage type for widgets */
+ GtkWidget *window;
+ GtkWidget *button;
+
+ /* This is called in all GTK applications. Arguments are parsed
+ * from the command line and are returned to the application. */
+ gtk_init (&argc, &argv);
+
+ /* create a new window */
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+
+ /* When the window is given the "delete-event" signal (this is given
+ * by the window manager, usually by the "close" option, or on the
+ * titlebar), we ask it to call the delete_event () function
+ * as defined above. The data passed to the callback
+ * function is NULL and is ignored in the callback function. */
+ g_signal_connect (window, "delete-event",
+ G_CALLBACK (delete_event), NULL);
+
+ /* Here we connect the "destroy" event to a signal handler.
+ * This event occurs when we call gtk_widget_destroy() on the window,
+ * or if we return FALSE in the "delete-event" callback. */
+ g_signal_connect (window, "destroy",
+ G_CALLBACK (destroy), NULL);
+
+ /* Sets the border width of the window. */
+ gtk_container_set_border_width (GTK_CONTAINER (window), 10);
+
+ /* Creates a new button with the label "Hello World". */
+ button = gtk_button_new_with_label ("Hello World");
+
+ /* When the button receives the "clicked" signal, it will call the
+ * function hello() passing it NULL as its argument. The hello()
+ * function is defined above. */
+ g_signal_connect (button, "clicked",
+ G_CALLBACK (hello), NULL);
+
+ /* This will cause the window to be destroyed by calling
+ * gtk_widget_destroy(window) when "clicked". Again, the destroy
+ * signal could come from here, or the window manager. */
+ g_signal_connect_swapped (button, "clicked",
+ G_CALLBACK (gtk_widget_destroy),
+ window);
+
+ /* This packs the button into the window (a gtk container). */
+ gtk_container_add (GTK_CONTAINER (window), button);
+
+ /* The final step is to display this newly created widget. */
+ gtk_widget_show (button);
+
+ /* and the window */
+ gtk_widget_show (window);
+
+ /* All GTK applications must have a gtk_main(). Control ends here
+ * and waits for an event to occur (like a key press or
+ * mouse event). */
+ gtk_main ();
+
+ return 0;
+}