Re: [gtkmm] Actions / UIManager and OO programming style

[Christer Palm <palm nogui se>]

Murray Cumming wrote:
> On Wed, 2004-06-30 at 02:52 +0200, Christer Palm wrote:
> > OK - I've been playing around trying to derive from Gtk::Action using 
> > the Action(const Glib::ConstructParams& construct_params) constructor, 
>
>
> No, that's not something that you should try to use - it's only for
> internal use.

There are two protected constructors for Gtk::Action (at least in gtkmm 
2.4.3 which is what I have):

  explicit Action(const Glib::ConstructParams& construct_params);
  explicit Action(GtkAction* castitem);

Both of which I would certainly put in the "internal use only" category. 
Given the available choices, the first one was the only one to at least 
make some sense.

> > Would it be possible for someone to provide me with a simple example of 
> > how this is properly done?
>
> How about you try to do it and tell us what problems you have?

Believe me, I have tried it. But frankly, the result was too embarassing 
to even post here. Basically, I wasn't able to figure how to properly 
use the Glib::ConstructParams. I happily admit that I'm quite lost when 
I'm down at the GObject level.

> Nothing about RefPtr stops you from deriving.

Technically, no, of course.

> There are protected constructors, so you can derive.

The point is that among the classes using the create() pattern, that's 
not always the case. Quite a few of them are lacking useful protected 
constructors.

> If you need an
> extra constructor then I would be happy to look at a patch.

I will see what I can come up with. I was hoping that it was just me 
making some silly mistake.

--
Christer Palm