<?xml version="1.0" encoding="utf-8"?>
<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="menubutton.py" xml:lang="fr">
  <info>
  <title type="text">MenuButton</title>
    <link type="guide" xref="beginner.py#buttons"/>
    <link type="next" xref="toolbar.py"/>
    <revision version="0.1" date="2012-08-19" status="draft"/>

    <credit type="author copyright">
      <name>Tiffany Antopolski</name>
      <email its:translate="no">tiffany.antopolski@gmail.com</email>
      <years>2012</years>
    </credit>

    <credit type="author copyright">
      <name>Marta Maria Casetti</name>
      <email its:translate="no">mmcasetti@gmail.com</email>
      <years>2012</years>
    </credit>

    <desc>Un élément graphique qui affiche un menu quand il est cliqué</desc>
  </info>

  <title>MenuButton</title>
  <media type="image" mime="image/png" src="media/menubutton.png"/>
  <p>L'élément graphique GtkMenuButton sert à afficher un menu quand il est cliqué. Le menu peut provenir soit d'un GtkMenu, soit d'un GMenuModel abstrait. L'élément graphique GtkMenuButton peut contenir n'importe quel élément graphique enfant valide. Ceci dit, il peut contenir pratiquement n'importe quel autre GtkWidget standard. L'enfant le plus souvent utilisé est la flèche GtkArrow fournie.</p>

  <note><p>Pour que le MenuButton fonctionne, il vous faut avoir installé GNOME 3.6</p></note>

  <links type="section"/>
    
  <section id="code">
  <title>Code utilisé pour générer cet exemple</title>
    <code mime="text/x-python" style="numbered">from gi.repository import Gtk
from gi.repository import Gio
import sys


class MyWindow(Gtk.ApplicationWindow):

    def __init__(self, app):
        Gtk.Window.__init__(self, title="Menubutton Example", application=app)
        self.set_default_size(600, 400)

        grid = Gtk.Grid()

        # a menubutton
        menubutton = Gtk.MenuButton()
        menubutton.set_size_request(80, 35)

        grid.attach(menubutton, 0, 0, 1, 1)

        # a menu with two actions
        menumodel = Gio.Menu()
        menumodel.append("New", "app.new")
        menumodel.append("About", "win.about")

        # a submenu with one action for the menu
        submenu = Gio.Menu()
        submenu.append("Quit", "app.quit")
        menumodel.append_submenu("Other", submenu)

        # the menu is set as the menu of the menubutton
        menubutton.set_menu_model(menumodel)

        # the action related to the window (about)
        about_action = Gio.SimpleAction.new("about", None)
        about_action.connect("activate", self.about_callback)
        self.add_action(about_action)

        self.add(grid)

    # callback for "about"
    def about_callback(self, action, parameter):
        print "You clicked \"About\""


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)

        #  the actions related to the application
        new_action = Gio.SimpleAction.new("new", None)
        new_action.connect("activate", self.new_callback)
        self.add_action(new_action)

        quit_action = Gio.SimpleAction.new("quit", None)
        quit_action.connect("activate", self.quit_callback)
        self.add_action(quit_action)

    # callback functions for the actions related to the application
    def new_callback(self, action, parameter):
        print "You clicked \"New\""

    def quit_callback(self, action, parameter):
        print "You clicked \"Quit\""
        self.quit()

app = MyApplication()
exit_status = app.run(sys.argv)
sys.exit(exit_status)
</code>
  </section>

  <section id="methods">
  <title>Useful methods for a MenuButton widget</title>
      <p>In line 33 the signal <code>"activate"</code> from the action <code>about_action</code> is connected to the callback function <code>about_callback()</code> using <code><var>action</var>.connect(<var>signal</var>, <var>callback function</var>)</code>. See <link xref="signals-callbacks.py"/> for a more detailed explanation.</p>

    <p>The positioning of the menu is determined by the "direction" property of the menu button and the "halign" or "valign" properties of the menu. For example, when the direction is <code>Gtk.ArrowType.DOWN</code> (other option: <code>UP</code>) and the horizontal alignment is <code>Gtk.Align.START</code> (other options: <code>CENTER</code> and <code>END</code>), the menu will be positioned below the button, with the starting edge (depending on the text direction) of the menu aligned with the starting edge of the button. If there is not enough space below the button, the menu is popped up above the button instead. If the alignment would move part of the menu offscreen, it is 'pushed in'.</p>
    
    <p>In the case of vertical alignment, the possible ArrowType directions are <code>LEFT</code> and <code>RIGHT</code> and the vertical alignment is again <code>START</code>, <code>CENTER</code> or <code>END</code>.</p>
    
    <p><code>set_align_widget(alignment)</code> and <code>set_direction(direction)</code> can be used to set these properties.</p>
  </section>
  
  <section id="references">
  <title>Références API</title>
    <p>Dans cet exemple, les éléments suivants sont utilisés :</p>
    <list>
      <item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkMenuButton.html">MenuButton</link></p></item>
    </list>
  </section>
</page>
