> I would like to pass some object handles to a callback via
> u_vdata. I can do it with a single object:
>
> FL_OBJECT *obj;
> FL_OBJECT *but;
>
> obj = fl_add_input(...);
> but = fl_add_button(...);
> but->u_vdata = obj;
Yes, you can do it this way. However, more recent versions of XForms
and fdesign make this sort of object handling easier.
The FL_FORM structure now has a member
void *fdui; /* for fdesign */
which is filled by the form creation routine generated by fdesign and
points to the FD_* structure for that form. Each instantiation of the
form will, of course, point to a different instantiation of the FD_*
structure.
If you're coding your own form/object creation, this structure member
is available for your use.
Say, for instance, you have a form `try':
FD_try *fd_try;
fd_try = create_form_try();
[...]
Now, in a callback routine invoked by some action for the form you can
code
void some_callback_cb( FL_OBJECT *obj, long data )
{
FD_try *fd_try = ( FD_try *) obj->form->fdui;
[...]
and the operate on any of the objects within the `try' form using
standard calls:
[...]
fl_set_object_color( fd_try->some_object, FL_BLUE, FL_GREEN );
fl_set_object_color( fd_try->some_other_object, FL_BLUE, FL_GREEN );
[...]
for example.
This structure member appeared in 0.86, I think, so earlier libraries
may not support it.
spl
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