Re: [GTKMM] Standalone pixmap

[Carl Nygard <cjnygard verizon net>]

On Wed, 2004-12-29 at 13:55 +0100, Mateusz 'vArDo' Bilinski wrote:
> Rob Benton wrote:
> > Passing a Gdk::Drawable into the Gdk::Pixmap::create() method does not 
> > associate it or anything like that.  All it does is set the Pixmap's 
> > depth to that of the Gdk::Drawable you passed in.
> > 
> > If I'm wrong someone please correct me.  I looked at the Gtk 
> > "gdk_pixmap_new()" function for this info.
> 
> Thanks for anwsering.
> 
> I think you're right. I've checked this once again. I misunderstood it
> because I thought I've checked it once and for example I couldn't create
> a pixmap with size for 10x20 and had to create a pixmap using get_width
> (), get_height() methods. But it was probably very late ;/.
> 
> But from what I read if I set my own depth (diffrent from -1) I don't
> have to give any Gdk::Drawable. The question is how to do it?
> 
>  Glib::RefPtr<Gdk::Pixmap> pixmap = Gdk::Pixmap::create(
>     0,
>     100,
>     100,
>     2);
> 
> does not work as I had written before. I know that it should be a
> reference, but how can I pass a null-reference? Using some Glib stuff?
> It an argument were a pointer it should work, but now I of course get
> errors like this:

Try Glib::RefPtr<Gdk::Drawable>() as first arg.