[pygtk] Formatting a spinbutton's display

[Tim Evans]

Jeremy S wrote:
> I would like to use a spinbutton but instead of just displaying a
> float or integer, I want the display to be formatted.  In my case I
> want it to be formatted as currency ($ in front and commas separating
> thousands, millions, etc.), but I can't even find any information on
> how to tackle this problem generally.
> 
> I know for treeviews this type of thing can be accomplished with
> set_cell_data_func.  Is there anything similar for spinbuttons?

The "input" and "output" signals on the spinbutton solve this problem. 
Using the "input" signal is rather complex however because the second 
argument is a C pointer to a double and not a python type.  To make it 
worse, it's passed as an opaque "gpointer" type.  I found (by looking at 
the pygtk source code) that I could access the real address from it 
using the "hash" function, and once I had that I could use ctypes to set 
the double it points to.

Attached an ugly hack that solves your problem.  Thanks for posting btw, 
this was fun ;)

-- 
Tim Evans
Applied Research Associates NZ
http://www.aranz.com/
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