Choose a number, by entering it or by clicking on the -/+ buttons!
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)
A Gtk.Adjustment is needed to construct the Gtk.SpinButton. This is the representation of a value with a lower and upper bound, together with step and page increments, and a page size, and it is constructed as Gtk.Adjustment(value, lower, upper, step_increment, page_increment, page_size) where the fields are of type float; step_increment is the increment/decrement that is obtained by using the cursor keys or the buttons of the spinbutton. Note that page_increment and page_size are not used in this case, and they should be set to 0.
In line 23 the signal "value-changed" is connected to the callback function spin_selected() using widget.connect(signal, callback function). See for a more detailed explanation.
If you want the value of the spinbutton to wrap around when they exceed the maximum or the minimum, set set_wrap(True). The "wrapped" signal is emitted when this happens.
set_digits(digits) sets the precision to be displayed by the spinbutton, up to 20 digits.
To get the value of the spinbutton as an integer, use get_value_as_int().
In this sample we used the following:
GtkSpinButton
GtkAdjustment