[pygtk] Using changed event

[Nikos Kouremenos]

if it's better than the FAQ, why not update also the FAQ on this?

TIA

On 1/31/06, Richard Taylor <rjt-pygtk at thegrindstone.me.uk> wrote:
> On Monday 30 Jan 2006 15:24, Nicholas Wieland wrote:
> > Hi *,
> > I need to trap all non-digits in a gtk.Entry, to prevent hte user
> > from inserting letters and symbols at all.
> > I'm trying to use the 'changed' event, but it doesn't seem to work:
> >
> >    def foo (self, widget):
> >      if re.match ('[A-Za-z,.\-+]', widget.get_text () [-1]):
> >        return True
> >
> > Any idea ?
> >
> > TIA,
>
> You might find this useful, it is the Integer only edit widget from gramps
> (www.gramps-project.org). It is based on the code in the FAQ.
>
> class IntEdit(gtk.Entry):
>     """An gtk.Edit widget that only allows integers."""
>
>     def __init__(self):
>         gtk.Entry.__init__(self)
>
>         self._signal = self.connect("insert_text", self.insert_cb)
>
>     def insert_cb(self, widget, text, length, *args):
>         # if you don't do this, garbage comes in with text
>         text = text[:length]
>         pos = widget.get_position()
>         # stop default emission
>         widget.emit_stop_by_name("insert_text")
>         gobject.idle_add(self.insert, widget, text, pos)
>
>     def insert(self, widget, text, pos):
>         if len(text) > 0 and text.isdigit():
>             # the next three lines set up the text. this is done because we
>             # can't use insert_text(): it always inserts at position zero.
>             orig_text = widget.get_text()
>             new_text = orig_text[:pos] + text + orig_text[pos:]
>             # avoid recursive calls triggered by set_text
>             widget.handler_block(self._signal)
>             # replace the text with some new text
>             widget.set_text(new_text)
>             widget.handler_unblock(self._signal)
>             # set the correct position in the widget
>             widget.set_position(pos + len(text))
>
> Regards
>
> Richard
>
>
> --
> You can normally find me on Jabber as RichardTaylor at jabber.org
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>


--
Nikos Kouremenos