Re: TreeView::append_column_numeric() format?

["Marco" <mscholtn xs4all nl>]

maybe it's an option to add iostream functions like precision(), width(), 
flags() etc. to Gtk::CellRenderer.
so we can do something like:

MyTreeViewColumn->get_first_cell_renderer()->precision(2);

Marco Scholten.

----- Original Message ----- 
From: "Murray Cumming" <murrayc murrayc com>
To: "Ainsley Pereira" <gtkmm pebble org uk>
Cc: <gtkmm-list gnome org>
Sent: Monday, November 22, 2004 1:10 PM
Subject: Re: TreeView::append_column_numeric() format?


> > > So I would like to add another templated convenience method like this:
> > > Gtk::TreeView::append_column_numeric(TreeModelColumn& model,
> > > numeric_format);
> > >
> > > But what's the best way to specify the display format for the number?
> > > I'd
> > > rather not use that nasty printf() style format. Does C++ have something
> > > more suitable?
> >
> > Boost has a "format" object (described here:
> > http://www.boost.org/libs/format/doc/format.html)
>
> Using a formatter object is a good idea, but it seems to mostly use the
> sprintf format anyway, with some extensions.
>
> Also I would feel bad about reproducing so much code in gtkmm. And we
> can't depend on boost because it's not a stable (API or ABI) library yet.
>
> If we find no better alternative to the sprintf format then we could just
> decide to live with
>  TreeView::append_column_numeric(TreeModelColumn& column, const
> Glib::ustring& format);
> where format is something like "%.4f" for 4decimal places.
>
> > I'm not suggesting that this actual class should be used, but it's a
> > starting point for ideas. The Gtk::TreeView::append_column_numeric()
> > method could take an object that formats a number (perhaps with a number
> > of
> > simple/common ones supplied). I don't know how all this works underneath
> > though, does it need to translate to printf format for the Gtk+ 
> > interface,
> > or does all the formatting happen in the C++ wrapper?
>
> Gtk+ has no equivalent for this. Their whole GtkTreeView API is much more
> unpleasant. And they are probably happy to use C-style sprintf formatting
> for this.
>
> Murray Cumming
> murrayc murrayc com
> www.murrayc.com
> www.openismus.com
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