12.2. Manual Menu Example

That should about do it. Let's take a look at an example to help clarify.

require 'gtk2'

def button_press( widget, event, menu)
   time = event.time
   button = event.time

   if event = Gdk::Event::BUTTON_PRESS
      menu.popup( nil, nil, nil, button, time )
   end
end

Gtk.init

# Create a new window
window = Gtk::Window.new( Gtk::Window::TOPLEVEL )
window.set_size_request( 200, 100 )
window.set_title( "Ruby-GNOME2 Menu Test" )
window.signal_connect( "delete_event" ) { Gtk.main_quit }
vbox = Gtk::VBox.new( false, 0 )
window.add( vbox )

# Create the menubar
menubar = Gtk::MenuBar.new
vbox.pack_start( menubar, false, false, 0)

# Create our toplevel menuitem
top_menu = Gtk::MenuItem.new( "Root Menu" )

# Append top_menu into the menubar
menubar.append( top_menu )

# Create an empty menu to hold all of our menuitems
menu = Gtk::Menu.new

# Create a few menuitems and append them into "menu"
for i in 1..10
   item = Gtk::MenuItem.new( "MenuItem #{i}" )
   menu.append( item )
end

# Now we set the submenu of top_menu to our menu
# holding all of our menuitems
top_menu.set_submenu( menu )

button = Gtk::Button.new( "Press Me" )
button.signal_connect( "button_press_event", Gdk::Event::BUTTON_PRESS  ) { 
   |widget, event, y| 
   button_press( widget, event, menu ) 
}
vbox.pack_start( button, true, true, 0)

window.show_all
Gtk.main