[9298] in The GTK GIMP ToolKit mailing list archive
[gtk-list] Re: gpointer and callbacks
daemon@ATHENA.MIT.EDU (Nwanua Elumeze)
Wed Oct 14 16:29:26 1998
Date: Wed, 14 Oct 1998 14:28:56 -0600 (MDT)
From: Nwanua Elumeze <nwanua@makaha.colorado.edu>
To: gtk-list@redhat.com
Resent-From: gtk-list@redhat.com
Reply-To: gtk-list@redhat.com
>> examples I found only strings where used. Can you pass any type using
>> gpointer?
Yes.
here's a little coding example to show how:
I have two buttons, the clicking of one would disable itself and enable
the other:
......
button1 = gtk_button_new_with_label("Enable 2");
button2 = gtk_button_new_with_label("Enable 1");
gtk_signal_connect (GTK_OBJECT (button1), "clicked",
GTK_SIGNAL_FUNC (enable_disable), (GtkWidget *)button2);
gtk_signal_connect (GTK_OBJECT (button1), "clicked",
GTK_SIGNAL_FUNC (enable_disable), (GtkWidget *)button1);
/* instead of (GtkWidget *)button1, you could also use the
the type-casting macros like: GTK_WIDGET(button1) */
.......
and the enable_disable function is defined as such:
gint enable_disable(GtkWidget *disable_this, GtkEvent *event,
GtkWidget *enable_this)
{
/* the GtkEvent event can be used to determine, left clicks,
right clicks, double or triple clicks, etc... */
........
/* any hoo... */
gtk_widget_set_sensitive(disable_this, FALSE);
gtk_widget_set_sensitive(enable_this, TRUE);
........
}
hope that helped.
Nwanua.
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