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/
import gtk, ctypes
def _currency_input(spinbutton, gpointer):
text = spinbutton.get_text()
if text.startswith('$'):
text = text[1:]
double = ctypes.c_double.from_address(hash(gpointer))
double.value = float(text)
return True
def _currency_output(spinbutton):
text = '$%.*f' % (int(spinbutton.props.digits),
spinbutton.props.adjustment.value)
spinbutton.set_text(text)
return True
def format_spinbutton_currency(spinbutton):
spinbutton.connect('input', _currency_input)
spinbutton.connect('output', _currency_output)
def _test():
s = gtk.SpinButton(gtk.Adjustment(value=1, lower=0, upper=1000,
step_incr=1))
s.props.digits = 2
format_spinbutton_currency(s)
w = gtk.Window()
w.props.border_width = 12
w.add(s)
w.show_all()
w.connect('destroy', gtk.main_quit)
gtk.main()
if __name__ == '__main__':
_test()
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