Limit input into Gtk.Entry to numbers only

Question

I am using GTK 4 with Python and have a Gtk.Entry widget which I would like to limit the characters which can be entered to numbers only. How do I do that?

Answer 1

You could connect the changed signal of teh Gtk.Entry to a callback function. In the call back function check the content of the input and remove ny non-numeric chars

def on_entry_changed(self, entry):
    # Use GLib.idle_add to delay the action until the main loop is idle
    GLib.idle_add(filter_entry_text, entry)

def filter_entry_text(entry):
    text = entry.get_text()
    new_text = ''.join([char for char in text if char.isdigit()])
    if new_text != text:
        entry.set_text(new_text)
        entry.set_position(-1)
    return False