# RadioButton (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
Botóns mutuamente exclusivos.
Fran Dieguez
frandieguez@gnome.org 2012-2013.

# RadioButton

Three RadioButtons. You can see in the terminal if they are turned off or on.

# Código usado para xerar este exemplo

from gi.repository import Gtk import sys

class MyWindow(Gtk.ApplicationWindow):

def __init__(self, app): Gtk.Window.__init__(self, title="RadioButton Example", application=app) self.set_default_size(250, 100) self.set_border_width(20)

# a new radiobutton with a label button1 = Gtk.RadioButton(label="Button 1") # connect the signal "toggled" emitted by the radiobutton # with the callback function toggled_cb button1.connect("toggled", self.toggled_cb)

# another radiobutton, in the same group as button1 button2 = Gtk.RadioButton.new_from_widget(button1) # with label "Button 2" button2.set_label("Button 2") # connect the signal "toggled" emitted by the radiobutton # with the callback function toggled_cb button2.connect("toggled", self.toggled_cb) # set button2 not active by default button2.set_active(False)

# another radiobutton, in the same group as button1, # with label "Button 3" button3 = Gtk.RadioButton.new_with_label_from_widget( button1, "Button 3") # connect the signal "toggled" emitted by the radiobutton # with the callback function toggled_cb button3.connect("toggled", self.toggled_cb) # set button3 not active by default button3.set_active(False)

# a grid to place the buttons grid = Gtk.Grid.new() grid.attach(button1, 0, 0, 1, 1) grid.attach(button2, 0, 1, 1, 1) grid.attach(button3, 0, 2, 1, 1) # add the grid to the window self.add(grid)

# callback function def toggled_cb(self, button): # a string to describe the state of the button state = "unknown" # whenever the button is turned on, state is on if button.get_active(): state = "on" # else state is off else: state = "off" # whenever the function is called (a button is turned on or off) # print on the terminal which button was turned on/off print(button.get_label() + " was turned " + state)

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)

# Métodos útiles para o widget RadioButton

In line 16 the signal `"toggled"` is connected to the callback function `toggled_cb()` using `widget.connect(signal, callback function)`. See for a more detailed explanation.

As seen in , instead of `button1 = Gtk.RadioButton(label="Button 1")` we could create the button and label it with

button1 = Gtk.RadioButton() button1.set_label("Button 1").

Yet another way to create a new RadioButton with a label is `button1 = Gtk.RadioButton.new_with_label(None, "Button 1")` (the first argument is the group of the radiobuttons, which we can get with `get_group()`, the second argument is the label).

# API References

Neste exemplo empregaremos o seguinte:

GtkWindow

GtkGrid

GtkRadioButton