Re: g_signal_connect -- "button-press-event" vs "pressed"

[Emmanuele Bassi <ebassi gmail com>]

On Wed, 2007-12-26 at 15:56 -0500, Charles Packer wrote:
> If I code a button widget like this (I'm using the version
> of GTK that came with Fedora Core 5)...
> 
> 	GtkWidget *B = gtk_button_new_with_label (Label);
> 	g_signal_connect (GTK_OBJECT (B), "button-press-event",
>                 G_CALLBACK (Happened), "HELLO");
> 
> and the callback is this...
> 
> 	Happened (GtkWidget *W, gpointer Data) {
> 		g_print ("ButtonHappened...|%s|\n", (char *) Data);
> 	}

no, the callback for the ::button-press-event signal has this signature:

  static gboolean
  on_button_press_event (GtkWidget      *widget,
                         GdkEventButton *event,
                         gpointer        user_data);


> Now, "button-press-event" is in lists of event types such as you 
> find in the GTK 2.0 tutorial at 
> http://www.gtk.org/tutorial/a2769.html

yes, and no.

a ::button-press-event is really a low-level signal which you shouldn't
be using unless you know what it is for.

what you want is the GtkButton::clicked signal, not the
GtkWidget::button-press-event signal.

the signature for the ::clicked signal is:

  static void
  on_clicked (GtkButton *button,
              gpointer   user_data);


see: http://library.gnome.org/devel/gtk/stable/GtkButton.html
     http://www.gtk.org/tutorial/c491.html#SEC-NORMALBUTTONS

ciao,
 Emmanuele.

-- 
Emmanuele Bassi,
W: http://www.emmanuelebassi.net
B: http://log.emmanuelebassi.net