Creating a pygtk text field that only accepts a number

Question

Does anyone know how to create a text field using PyGTK that only accepts a number. I use Glade to create my user interface.

Greetings

Answer 1

I would not know about a way to do something like this by simply switching settings, I think you would need to process this through signals, one way would be to connect to a signal changed, and then filter out something that is not a number.

A simple approach (untested, but should work):

class NumberEntry(gtk.Entry):
    def __init__(self):
        gtk.Entry.__init__(self)
        self.connect('changed', self.on_changed)

    def on_changed(self, *args):
        text = self.get_text().strip()
        self.set_text(''.join([i for i in text if i in '0123456789']))

Numbers, , , - , , .

Python, "numbify" .

    def numbify(widget):
        def filter_numbers(entry, *args):
            text = entry.get_text().strip()
            entry.set_text(''.join([i for i in text if i in '0123456789']))

        widget.connect('changed', filter_numbers)

    # Use gtk.Builder rather than glade, you'll need to change the format of your .glade file in Glade accordingly
    builder = gtk.Builder()
    builder.add_from_file('yourprogram.glade')
    entry = builder.get_object('yourentry')

    numbify(entry)

Answer 2

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: http://www.pygtk.org/pygtk2tutorial/examples/spinbutton.py

Answer 3

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try:
    val = float(entry.get_text())
    entry.set_text(str(val))
except ValueError:
    entry.set_text('')