Add menu bar example

Cargo.toml

@@ -56,3 +56,6 @@ name = "multithreading_context"
 
 [[bin]]
 name = "simple_treeview"
+
+[[bin]]
+name = "menu_bar"

src/menu_bar.rs

@@ -0,0 +1,107 @@
+//! # MenuBar Sample
+//!
+//! This sample demonstrates how to use Menus/MenuBars and MenuItems
+
+extern crate gtk;
+
+use gtk::prelude::*;
+use gtk::{
+    AboutDialog, CheckMenuItem, IconSize, Image, Label, Menu, MenuBar, MenuItem, Window,
+    WindowPosition, WindowType
+};
+
+fn main() {
+    if gtk::init().is_err() {
+        println!("Failed to initialize GTK.");
+        return;
+    }
+
+    let window = Window::new(WindowType::Toplevel);
+
+    window.set_title("MenuBar example");
+    window.set_position(WindowPosition::Center);
+    window.set_size_request(400, 400);
+
+    window.connect_delete_event(|_, _| {
+        gtk::main_quit();
+        Inhibit(false)
+    });
+
+    let v_box = gtk::Box::new(gtk::Orientation::Vertical, 10);
+
+    let menu = Menu::new();
+    let menu_bar = MenuBar::new();
+    let file = MenuItem::new_with_label("File");
+    let about = MenuItem::new_with_label("About");
+    let quit = MenuItem::new_with_label("Quit");
+    let file_item = MenuItem::new();
+    let file_box = gtk::Box::new(gtk::Orientation::Horizontal, 0);
+    let file_image = Image::new_from_file("resources/file.png");
+    let file_label = Label::new(Some("File"));
+    let folder_item = MenuItem::new();
+    let folder_box = gtk::Box::new(gtk::Orientation::Horizontal, 0);
+    let folder_image = Image::new_from_icon_name("folder-music-symbolic", IconSize::Menu.into());
+    let folder_label = Label::new(Some("Folder"));
+    let check_item = CheckMenuItem::new_with_label("Click me!");
+
+    file_box.pack_start(&file_image, false, false, 0);
+    file_box.pack_start(&file_label, true, true, 0);
+    file_item.add(&file_box);
+    folder_box.pack_start(&folder_image, false, false, 0);
+    folder_box.pack_start(&folder_label, true, true, 0);
+    folder_item.add(&folder_box);
+    menu.append(&file_item);
+    menu.append(&folder_item);
+    menu.append(&check_item);
+    menu.append(&about);
+    menu.append(&quit);
+    file.set_submenu(Some(&menu));
+    menu_bar.append(&file);
+
+    let other_menu = Menu::new();
+    let sub_other_menu = Menu::new();
+    let other = MenuItem::new_with_label("Another");
+    let sub_other = MenuItem::new_with_label("Sub another");
+    let sub_other2 = MenuItem::new_with_label("Sub another 2");
+    let sub_sub_other2 = MenuItem::new_with_label("Sub sub another 2");
+    let sub_sub_other2_2 = MenuItem::new_with_label("Sub sub another2 2");
+
+    sub_other_menu.append(&sub_sub_other2);
+    sub_other_menu.append(&sub_sub_other2_2);
+    sub_other2.set_submenu(Some(&sub_other_menu));
+    other_menu.append(&sub_other);
+    other_menu.append(&sub_other2);
+    other.set_submenu(Some(&other_menu));
+    menu_bar.append(&other);
+
+    quit.connect_activate(|_| {
+        gtk::main_quit();
+    });
+
+    let label = Label::new(Some("MenuBar example"));
+
+    v_box.pack_start(&menu_bar, false, false, 0);
+    v_box.pack_start(&label, true, true, 0);
+    window.add(&v_box);
+    window.show_all();
+
+    about.connect_activate(move |_| {
+        let p = AboutDialog::new();
+        p.set_authors(&["gtk-rs developers"]);
+        p.set_website_label(Some("gtk-rs"));
+        p.set_website(Some("http://gtk-rs.org"));
+        p.set_authors(&["Gtk-rs developers"]);
+        p.set_title("About!");
+        p.set_transient_for(Some(&window));
+        p.run();
+        p.destroy();
+    });
+    check_item.connect_toggled(|w| {
+        w.set_label(if w.get_active() {
+            "Checked"
+        } else {
+            "Unchecked"
+        });
+    });
+    gtk::main();
+}