<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="radiobutton.py" xml:lang="gl">

  <info>

    <title type="text">RadioButton (Python)</title>

    <link type="guide" xref="beginner.py#buttons"/>

    <link type="seealso" xref="grid.py"/>

    <link type="next" xref="buttonbox.py"/>

    <revision version="0.1" date="2012-05-09" status="draft"/>

    <credit type="author copyright">

      <name>Marta Maria Casetti</name>

      <email its:translate="no">mmcasetti@gmail.com</email>

      <years>2012</years>

    </credit>

    <desc>Botóns mutuamente exclusivos.</desc>

    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">

      <mal:name>Fran Dieguez</mal:name>

      <mal:email>frandieguez@gnome.org</mal:email>

      <mal:years>2012-2013.</mal:years>

    </mal:credit>

  </info>

  <title>RadioButton</title>

  <media type="image" mime="image/png" src="media/radiobutton.png"/>

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

  <links type="section"/>

  <section id="code">

    <title>Código usado para xerar este exemplo</title>

    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)

  </section>

  <section id="methods">

    <title>Métodos útiles para o widget RadioButton</title>

    
In line 16 the signal "toggled" is connected to the callback function toggled_cb() using widget.connect(signal, callback function). See <link xref="signals-callbacks.py"/> for a more detailed explanation.

    
As seen in <link xref="properties.py"/>, 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).

  </section>

  <section id="references">

    <title>API References</title>

    
Neste exemplo empregaremos o seguinte:

    <list>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkWindow.html">GtkWindow</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkGrid.html">GtkGrid</link>
</item>

      <item>
<link href="http://developer.gnome.org/gtk3/unstable/GtkRadioButton.html">GtkRadioButton</link>
</item>

    </list>

  </section>

</page>