Re: Program Structure

[rob <mailingLists pangolin org uk>]

Every instance method needs to be passed a pointer to the instance
(typicaly called 'self' or 'this').

i.e
void add_to_the_label(MyClassInstance *self, gchar *charsToAdd)
{
GtkLabel *theLabel = get_theLabel(self);
gchar *oldText;
gtk_label_get(theLabel, oldText);
gchar *newText = g_strconcat(oldText, charsToAdd, '\0');
gtk_label_set_text(theLabel, newText);
g_free(oldText);
}

the get (and set) methods can delve into the containers and retrive the
widget for you or you can store a pointer to the widget in the instance
data and they just return that.
 
On Sun, 08 Apr 2001 01:02:27 frankc srv net wrote:
> I am having trouble understanding the structure of programming a GTK+
> app. My biggest hangup is how do I modify a widget that is nested in a
> window several levels down?  I looked at mapping to it by name or
> creating a master structure containing all the widget pointers.  Neither
> of these look very practical.  Another method I thought of was creating
> a callback that responds to a signal manufactured by another widget.
> This last I am not sure how to approach, but I am hoping I can send data
> to the widget that responds to the signal.  This problem probably has a
> simpler solution.  I am new to programming this way as opposed to a
> linear program. I am used to having access to all my data all the time.
> I would like to keep my apps object oriented, but I am not understanding
> how to make widgets talk to each other easily without destroying the OO
> barriers.
>
> Thanks,
> Frank
>
>
> _______________________________________________
> gtk-app-devel-list mailing list
> gtk-app-devel-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
rob