<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.js" xml:lang="pt-BR">

  <info>

  <title type="text">MenuButton (JavaScript)</title>

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

    <revision version="0.1" date="2012-07-18" status="draft"/>

    <credit type="author copyright">

      <name>Anna Zacchi</name>

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

      <years>2012</years>

    </credit>

    <desc>A widget that shows a menu when clicked on</desc>

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

      <mal:name>Rafael Ferreira</mal:name>

      <mal:email>rafael.f.f1@gmail.com</mal:email>

      <mal:years>2013</mal:years>

    </mal:credit>

  </info>

  <title>MenuButton</title>

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

  
The GtkMenuButton widget is used to display a menu when clicked on. This menu can be provided either as a GtkMenu, or an abstract GMenuModel.

The GtkMenuButton widget can hold any valid child widget. That is, it can hold almost any other standard GtkWidget. The most commonly used child is the provided GtkArrow.

<note>
You need to be running GNOME 3.6 or later for the MenuButton to work.
</note>

#!/usr/bin/gjs

imports.gi.versions.Gtk = '3.0';

const Gio = imports.gi.Gio;

const GLib = imports.gi.GLib;

const Gtk = imports.gi.Gtk;

class Application {

    //create the application

    constructor() {

        this.application = new Gtk.Application({

            application_id: 'org.example.myapp',

            flags: Gio.ApplicationFlags.FLAGS_NONE

        });

        //connect to 'activate' and 'startup' signals to the callback functions

        this.application.connect('activate', this._onActivate.bind(this));

        this.application.connect('startup', this._onStartup.bind(this));

    }

    //create the UI (in this case it's just the ApplicationWindow)

    _buildUI() {

        this._window = new Gtk.ApplicationWindow({ application: this.application,

                                                   window_position: Gtk.WindowPosition.CENTER,

                                                   title: "MenuButton Example" });

        this._window.set_default_size(600, 400);

        this.grid = new Gtk.Grid();

        this._window.add(this.grid);

        this._menuButton = new Gtk.MenuButton();

        this.grid.attach(this._menuButton, 0, 0, 1, 1 );

        this.menu = Gtk.Menu.new_from_model(this.menuModel);

        this.menu.show();

        this._menuButton.set_menu_model (this.menuModel);

        this._menuButton.set_size_request(80, 35);

        this._menuButton.show();

        this._window.show_all();

    }

    _showNew() {

        print("You clicked \"New\"");

    }

    _showAbout() {

        print("You clicked \"About\"");

    }

    //create the menu items and connect the signals to the callback functions.

    _initMenus() {

        let newAction = new Gio.SimpleAction({ name: 'new' });

        newAction.connect('activate', () => { this._showNew(); });

        this.application.add_action(newAction);

        let aboutAction = new Gio.SimpleAction({ name: 'about' });

        aboutAction.connect('activate', () => { this._showAbout(); });

        this.application.add_action(aboutAction);

        let quitAction = new Gio.SimpleAction({ name: 'quit' });

        quitAction.connect('activate', () => { this._window.destroy(); });

         this.application.add_action(quitAction);

        this.menuModel = new Gio.Menu();

        this.menuItemNew = Gio.MenuItem.new("New", 'app.new');

        this.menuItemAbout = Gio.MenuItem.new("About", 'app.about');

        this.fileMenuItem = Gio.MenuItem.new("Other", null);

        this.menuModel.append_item(this.menuItemNew);

        this.menuModel.append_item(this.menuItemAbout);

        //submenu

        this.subMenu = new Gio.Menu();

        this.fileMenuItem.set_submenu(this.subMenu);

        this.menuItemQuit = Gio.MenuItem.new("Quit", 'app.quit');

        this.subMenu.append_item(this.menuItemQuit);

        this.menuModel.append_item(this.fileMenuItem);

    }

    //callback function for 'activate' signal

    _onActivate() {

        this._window.present();

    }

    //callback function for 'startup' signal

    _onStartup() {

        //You must call _initMenus() before calling _buildUI().

        this._initMenus();

        this._buildUI();

    }

};

//run the application

let app = new Application();

app.application.run(ARGV);

  In this sample we used the following:

<list>

  <item>
<link href="http://developer.gnome.org/gtk3/3.5/gtk3-GtkMenuButton.html">MenuButton</link>
</item>

</list>

</page>