# Switch (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
A "light switch" style toggle

# Switch

This Switch makes the title appears and disappear.

# Code used to generate this example

from gi.repository import Gtk import sys

class MyWindow(Gtk.ApplicationWindow): # a window

def __init__(self, app): Gtk.Window.__init__(self, title="Switch Example", application=app) self.set_default_size(300, 100) self.set_border_width(10)

# a switch switch = Gtk.Switch() # turned on by default switch.set_active(True) # connect the signal notify::active emitted by the switch # to the callback function activate_cb switch.connect("notify::active", self.activate_cb)

# a label label = Gtk.Label() label.set_text("Title")

# a grid to allocate the widgets grid = Gtk.Grid() grid.set_column_spacing(10) grid.attach(label, 0, 0, 1, 1) grid.attach(switch, 1, 0, 1, 1)

# add the grid to the window self.add(grid)

# Callback function. Since the signal is notify::active # we need the argument 'active' def activate_cb(self, button, active): # if the button (i.e. the switch) is active, set the title # of the window to "Switch Example" if button.get_active(): self.set_title("Switch Example") # else, set it to "" (empty string) else: self.set_title("")

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)

# Useful methods for a Switch widget

In line 17 the signal `"notify::active"` is connected to the callback function `activate_cb()` using `widget.connect(signal, callback function)`. See for a more detailed explanation.

# API References

In this sample we used the following:

GtkSwitch

GtkLabel

GtkGrid