Re: [gtkmm] Custom types in a Gtk::TreeView

[Murray Cumming <murrayc murrayc com>]

On Tue, 2004-04-13 at 14:12, Roger Leigh wrote:
> >From what I've read in the sources, this should do the trick (from
> treeviewcolumn.h):
> 
> namespace Gtk
> {
>   namespace TreeViewColumn_CellRendererGeneration
>   {
>     template<>
>     CellRenderer* generate_cell_renderer<numeric>(bool editable)
>     {
>       CellRendererNumeric* pCellRenderer = new CellRendererNumeric();
>       pCellRenderer->property_editable() = editable;
>       return pCellRenderer;
>     }
>   }
> }
> 
> Is adding support for my own types into your namespace OK?

It's a template specialization, so I guess you have no choice. Just
don't export the symbol in any library that you distribute widely.

> My question here: I need a property_numeric() property, so I can set
> the number being rendered.  If I derive from CellRendererText, I can
> then set property_text() as a side effect.  However, I assume that due
> to being a wrapper, I need to actually set a property ("numeric") in
> the underlying GObject, with g_object_install_property(), and wrap
> that with a PropertyProxy.  Since I have a C++ type (numeric), I'm not
> sure how to do that (GValue?), since I need to somehow create a
> GParamSpec to install as a property (I didn't see this wrapped).
> 
> Is this correct?  Or is there an easier way?

If you just add a PropertyProxy(), it should do that for you. It's
magic. See for instance, MyCellRendererToggle in the examples.

-- 
Murray Cumming
www.murrayc.com
murrayc murrayc com