Re: A custom cellrenderer for a bixbuf with text

[muppet <scott asofyet org>]

On Friday, April 30, 2004, at 01:55 AM, Florian Schaefer wrote:

> On Thu, 29 Apr 2004 20:23:52 -0400, muppet said:
>
> > i tried it -- a window pops up and immediately explodes, with the  
> > message
>
> Huh, it didn't do that here (running XFree 4.3.0).

undoubtedly because your colormap and visual are the same as the X  
default.  i am running on a linux server and displaying on a powerbook  
using Apple's X11, which always has something different going on.  on  
linux, X runs at 32 bits with LSB byte order, but on Mac, it runs at 32  
bits with MSB.


> >    3) but even the two solutions mentioned above aren't the right  
> > thing to do.  GtkWidget keeps a pointer to a GtkStyle, which has a  
> > bunch of GdkGCs in it, already configured for the current mode!  you  
> > should be using those!
>
> I would certainly have done this, if I would have know this. I suppose  
> that I've again overseen it in the docs somewhere.

several examples do the same thing:
   
http://cvs.sourceforge.net/viewcvs.py/gtk2-perl/gtk2-perl-xs/Gtk2/ 
examples/cellrenderer_popup.pl?rev=1.7&view=markup
   
http://cvs.sourceforge.net/viewcvs.py/gtk2-perl/gtk2-perl-xs/Gtk2/ 
examples/scribble.pl?rev=1.10&view=markup
   
http://cvs.sourceforge.net/viewcvs.py/gtk2-perl/gtk2-perl-xs/Gtk2/ 
examples/histogramplot.pl?rev=1.11&view=markup

what are graphics contexts?
  http://developer.gnome.org/doc/API/2.0/gdk/gdk-Graphics-Contexts.html
  http://developer.gnome.org/doc/GGAD/sec-gc.html

each widget has a style, and styles have colors and contexts:
  http://developer.gnome.org/doc/GGAD/sec-style.html
  http://developer.gnome.org/doc/API/2.0/gtk/GtkStyle.html




> > perldoc Gtk2::Pango::Layout lists
> >
> >     (width, height) = $layout->get_pixel_size
> >
> > (available since Gtk2 0.20)
>
> Ouch, I tried $layout->get_size, but this call just returned numbers  
> way too large.

they are in "thousandths of device units".  you divide those numbers by  
PANGO_SCALE to get pixels.  the reasons have to do with accuracy and  
speed and other things.

http://developer.gnome.org/doc/API/2.0/pango/pango-Glyph- 
Storage.html#PANGO-SCALE-CAPS


> Thanks a lot for taking the time to help me.

no problem.  it's a great break from crying babies.

--
I don't have a drinking problem,
'cept when i can't get drink.
  -- Tom Waits