from gi.repository import Gtk

import sys

class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):

        Gtk.Window.__init__(self, title="SpinButton Example", application=app)

        self.set_default_size(210, 70)

        self.set_border_width(5)

        # an adjustment (initial value, min value, max value,

        # step increment - press cursor keys or +/- buttons to see!,

        # page increment - not used here,

        # page size - not used here)

        ad = Gtk.Adjustment(0, 0, 100, 1, 0, 0)

        # a spin button for integers (digits=0)

        self.spin = Gtk.SpinButton(adjustment=ad, climb_rate=1, digits=0)

        # as wide as possible

        self.spin.set_hexpand(True)

        # we connect the signal "value-changed" emitted by the spinbutton with the callback

        # function spin_selected

        self.spin.connect("value-changed", self.spin_selected)

        # a label

        self.label = Gtk.Label()

        self.label.set_text("Choose a number")

        # a grid to attach the widgets

        grid = Gtk.Grid()

        grid.attach(self.spin, 0, 0, 1, 1)

        grid.attach(self.label, 0, 1, 2, 1)

        self.add(grid)

    # callback function: the signal of the spinbutton is used to change the

    # text of the label

    def spin_selected(self, event):

        self.label.set_text(

            "The number you selected is " + str(self.spin.get_value_as_int()) + ".")

class MyApplication(Gtk.Application):

    def __init__(self):

        Gtk.Application.__init__(self)

    def do_activate(self):

        win = MyWindow(self)

        win.show_all()

    def do_startup(self):

        Gtk.Application.do_startup(self)

app = MyApplication()

exit_status = app.run(sys.argv)

sys.exit(exit_status)