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from gi.repository import Gtk
import sys
class MyWindow(Gtk.ApplicationWindow):
def __init__(self, app):
Gtk.Window.__init__(self, title="Scale Example", application=app)
self.set_default_size(400, 300)
self.set_border_width(5)
# two adjustments (initial value, min value, max value,
# step increment - press cursor keys to see!,
# page increment - click around the handle to see!,
# page size - not used here)
ad1 = Gtk.Adjustment(0, 0, 100, 5, 10, 0)
ad2 = Gtk.Adjustment(50, 0, 100, 5, 10, 0)
# an horizontal scale
self.h_scale = Gtk.Scale(
orientation=Gtk.Orientation.HORIZONTAL, adjustment=ad1)
# of integers (no digits)
self.h_scale.set_digits(0)
# that can expand horizontally if there is space in the grid (see
# below)
self.h_scale.set_hexpand(True)
# that is aligned at the top of the space allowed in the grid (see
# below)
self.h_scale.set_valign(Gtk.Align.START)
# we connect the signal "value-changed" emitted by the scale with the callback
# function scale_moved
self.h_scale.connect("value-changed", self.scale_moved)
# a vertical scale
self.v_scale = Gtk.Scale(
orientation=Gtk.Orientation.VERTICAL, adjustment=ad2)
# that can expand vertically if there is space in the grid (see below)
self.v_scale.set_vexpand(True)
# we connect the signal "value-changed" emitted by the scale with the callback
# function scale_moved
self.v_scale.connect("value-changed", self.scale_moved)
# a label
self.label = Gtk.Label()
self.label.set_text("Move the scale handles...")
# a grid to attach the widgets
grid = Gtk.Grid()
grid.set_column_spacing(10)
grid.set_column_homogeneous(True)
grid.attach(self.h_scale, 0, 0, 1, 1)
grid.attach_next_to(
self.v_scale, self.h_scale, Gtk.PositionType.RIGHT, 1, 1)
grid.attach(self.label, 0, 1, 2, 1)
self.add(grid)
# any signal from the scales is signaled to the label the text of which is
# changed
def scale_moved(self, event):
self.label.set_text("Horizontal scale is " + str(int(self.h_scale.get_value())) +
"; vertical scale is " + str(self.v_scale.get_value()) + ".")
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)
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