Re: two or more objects into a signal handler

[jrb redhat com]

Gonzalo Aguilar <gad reymad com> writes:

> > > How can I pass two objects to a signal?
> > >
> > >
> > > I'm trying to make a button unclickable if a entry text box is empty, so
> > > I use the change event on the entry box to
> > > check if the entry box is empty and if so, then I make the button
> > > unclickable...
> > >
> > > But then I need the entry box and the button in the signal handler, but
> > > I only can pass one argument...
> > > The entry box to check if it's empty, and the button to make it
> > > unclickable...
> > >
> > > How can I make this operation?
> > >
> > > Should I use a structure to pass the pointers to the objects?
> > >
> > > Thanks for your help...
> > > Please answer to my e-mail too.
> >
> > The entry_changed signal handler has two arguments:
> >
> > on_entry_changed (GtkEditable     *entry,
> >                   gpointer         user_data);
> >
> > First is the GtkEntry that has changed, second is the user data
> > given by the signal_connect().
> > So you dont need to pass two arguments in this case.
>
> Yes, but I WANT to pass two OBJECTS to my handler...

If the entry passed in is not the entry you want, you need to create a
struct to pass in as user_data, or set the data on the object.  You can
do this by doing something like:

gtk_object_set_data (GTK_OBJECT (entry), "myobject1", object1);
gtk_object_set_data (GTK_OBJECT (entry), "myobject2", object2);

...

later in the callback:

GtkObject *object1 = gtk_object_get_data (GTK_OBJECT (entry), "myobject1");
GtkObject *object2 = gtk_object_get_data (GTK_OBJECT (entry), "myobject2");


Thanks,
-Jonathan