hegyi@1174: #include <gtk/gtk.h>
hegyi@1174: 
hegyi@1174: /* This is a callback function. The data arguments are ignored
hegyi@1174:  * in this example. More on callbacks below. */
hegyi@1174: static void hello( GtkWidget *widget,
hegyi@1174:                    gpointer   data )
hegyi@1174: {
hegyi@1174:     g_print ("Hello World\n");
hegyi@1174: }
hegyi@1174: 
hegyi@1174: static gboolean delete_event( GtkWidget *widget,
hegyi@1174:                               GdkEvent  *event,
hegyi@1174:                               gpointer   data )
hegyi@1174: {
hegyi@1174:     /* If you return FALSE in the "delete_event" signal handler,
hegyi@1174:      * GTK will emit the "destroy" signal. Returning TRUE means
hegyi@1174:      * you don't want the window to be destroyed.
hegyi@1174:      * This is useful for popping up 'are you sure you want to quit?'
hegyi@1174:      * type dialogs. */
hegyi@1174: 
hegyi@1174:     g_print ("delete event occurred\n");
hegyi@1174: 
hegyi@1174:     /* Change TRUE to FALSE and the main window will be destroyed with
hegyi@1174:      * a "delete_event". */
hegyi@1174: 
hegyi@1174:     return TRUE;
hegyi@1174: }
hegyi@1174: 
hegyi@1174: /* Another callback */
hegyi@1174: static void destroy( GtkWidget *widget,
hegyi@1174:                      gpointer   data )
hegyi@1174: {
hegyi@1174:     gtk_main_quit ();
hegyi@1174: }
hegyi@1174: 
hegyi@1174: int main( int   argc,
hegyi@1174:           char *argv[] )
hegyi@1174: {
hegyi@1174:     /* GtkWidget is the storage type for widgets */
hegyi@1174:     GtkWidget *window;
hegyi@1174:     GtkWidget *button;
hegyi@1174:     
hegyi@1174:     /* This is called in all GTK applications. Arguments are parsed
hegyi@1174:      * from the command line and are returned to the application. */
hegyi@1174:     gtk_init (&argc, &argv);
hegyi@1174:     
hegyi@1174:     /* create a new window */
hegyi@1174:     window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
hegyi@1174:     
hegyi@1174:     /* When the window is given the "delete_event" signal (this is given
hegyi@1174:      * by the window manager, usually by the "close" option, or on the
hegyi@1174:      * titlebar), we ask it to call the delete_event () function
hegyi@1174:      * as defined above. The data passed to the callback
hegyi@1174:      * function is NULL and is ignored in the callback function. */
hegyi@1174:     g_signal_connect (G_OBJECT (window), "delete_event",
hegyi@1174: 		      G_CALLBACK (delete_event), NULL);
hegyi@1174:     
hegyi@1174:     /* Here we connect the "destroy" event to a signal handler.  
hegyi@1174:      * This event occurs when we call gtk_widget_destroy() on the window,
hegyi@1174:      * or if we return FALSE in the "delete_event" callback. */
hegyi@1174:     g_signal_connect (G_OBJECT (window), "destroy",
hegyi@1174: 		      G_CALLBACK (destroy), NULL);
hegyi@1174:     
hegyi@1174:     /* Sets the border width of the window. */
hegyi@1174:     gtk_container_set_border_width (GTK_CONTAINER (window), 10);
hegyi@1174:     
hegyi@1174:     /* Creates a new button with the label "Hello World". */
hegyi@1174:     button = gtk_button_new_with_label ("Hello World");
hegyi@1174:     
hegyi@1174:     /* When the button receives the "clicked" signal, it will call the
hegyi@1174:      * function hello() passing it NULL as its argument.  The hello()
hegyi@1174:      * function is defined above. */
hegyi@1174:     g_signal_connect (G_OBJECT (button), "clicked",
hegyi@1174: 		      G_CALLBACK (hello), NULL);
hegyi@1174:     
hegyi@1174:     /* This will cause the window to be destroyed by calling
hegyi@1174:      * gtk_widget_destroy(window) when "clicked".  Again, the destroy
hegyi@1174:      * signal could come from here, or the window manager. */
hegyi@1174:     g_signal_connect_swapped (G_OBJECT (button), "clicked",
hegyi@1174: 			      G_CALLBACK (gtk_widget_destroy),
hegyi@1174:                               G_OBJECT (window));
hegyi@1174:     
hegyi@1174:     /* This packs the button into the window (a gtk container). */
hegyi@1174:     gtk_container_add (GTK_CONTAINER (window), button);
hegyi@1174:     
hegyi@1174:     /* The final step is to display this newly created widget. */
hegyi@1174:     gtk_widget_show (button);
hegyi@1174:     
hegyi@1174:     /* and the window */
hegyi@1174:     gtk_widget_show (window);
hegyi@1174:     
hegyi@1174:     /* All GTK applications must have a gtk_main(). Control ends here
hegyi@1174:      * and waits for an event to occur (like a key press or
hegyi@1174:      * mouse event). */
hegyi@1174:     gtk_main ();
hegyi@1174:     
hegyi@1174:     return 0;
hegyi@1174: }