Re: [[gtkmm] New pangomm interface issue]

[MHL Schulze t-online de (Martin Schulze)]

Am 31.08.2002 11:44 schrieb(en) Murray Cumming:
> Naofumi Yasufuku <naofumi yasufuku net> wrote:
> > Hi,
> >
> > In gtkmm-1.3.22, some pangomm interfaces have been changed, and so
> > I'm faced with some problems.
> >
> > I want to call Pango::Font::get_matrics() with NULL language argument
> > to indicate to get the metrics for the entire font.
> > But I cannot do it because new interface requires a const reference to
> > Language.
> >
> > pango C API allows pango_font_get_metrics(font, NULL), but pangomm
> > doesn't allow it.
> >
> > I think Pango::Font should provide
> >
> >   FontMetrics Font::get_metrics()
> >   {
> >     return FontMetrics((pango_font_get_metrics(gobj(), 0)));
> >   }
> >
> > to support pango C API specification completely.

Please wait with this change. In the process of documenting pangomm I
found that a default contructor for Pango::Language that creates an
invalid object (gobject_ = 0) is needed anyway. So this could also
be implemented with a default argument then:

Pango::Font::get_metrics(const Language& lang = Language())

What do you think is the better solution - Function overload or
default argument?

> >
> > There are same problems with other Pango:: classes. For example,
> > pango_font_description_better_match(desc, NULL, new_match) can be
> > called to determine if the style attributes of new_match are a match at
> > all, but Pango::FontDescription doesn't provide such interface.
>
> This sounds sensible. It seems like you are halfway to providing a
> patch...
>
>
> Murray Cumming
> murrayc usa net
> www.murrayc.com
>
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