From: "Harald Große" <harald.grosse@...>
Date: 2002-01-26T21:51:45+09:00
Subject: Re: Proc question (with Gtk Menus)

Hello,

to call function from menu and other methods, I use the following code:

$menu = [ [ "/_File",
                               "",               "<Branch>",        0 ],
                  [ "/File/toff",
                              "",               "<Tearoff>",       0 ],
                  [ "/File/_Open",
                              "<control>O",     "",
"file_open" ],
                  [ "/File/sep1",
                            "",               "<Separator>",     0 ],
                  [ "/File/_End",
                          "<control>E",     "",                "file_end" ],
            ......
            ]

class Program
    ......
   def buildMenu
     ......
     wbox = Gtk::VBox.new(false, 0)
        # menubar
        accel = Gtk::AccelGroup.new
        mbar = Gtk::ItemFactory.new(Gtk::ItemFactory::TYPE_MENU_BAR,
                                    "<main>", accel)
        mfac = []
        $menu.each { |m|
             mfac.push [ m[0], m[1], m[2], (m[3] == 0) ? nil :
roc{ method(m[3]).call(0) } ]
        }
        mbar.create_items(mfac)
      wbox.pack_start(mbar.get_widget("<main>"), false, false, 0)
      .......
    end



   # menu methods
   def file_open(mod)
      ...
   end
   def file_end(mod)
      Gtk.main_quit
   end
    ......
end

harald



>-----Urspr�ngliche Nachricht-----
>Von: Markus Jais <info@mjais.de>
>Newsgroups: comp.lang.ruby
>An: ruby-talk ML <ruby-talk@ruby-lang.org>; undisclosed-recipients: ;
<undisclosed-recipients: ;>
>Datum: Samstag, 26. Januar 2002 12:53
>Betreff: Proc question (with Gtk Menus)
>

>hello
>
>yesterday someone posted this code in response to one of my questions:
>
>require "gtk"
>class SampleWindow < Gtk::Window
>  def pn(msg)
>    return Proc.new {puts msg,"\n"}
>  end
>  def initialize
>    super
>    items=[
>          ["/_File",       nil,      "<Branch>",     nil,       nil],
>          ["/File/_New",  "<ctrl>N", "<Item>",       pn("New"), nil],
>          ["/File/_Quit", "<ctrl>Q", "<Item>",       pn("Quit",      nil],
>.......
>
>the 4th argument in the array has to be a function which returns a Proc
>
>lets say I want to call this function also in another place and there it
>should be a normal function which does not just return a Proc object.
>
>Is this possible??
>
>when I change the function to
>def pn(msg)
>        puts msg
>end
>
>then the function always gets executed when I puts it in the array
>
>maybe I am just blind or haven't understand how this Proc stuff really
>works?
>
>please help. this drives me crazy :-)
>
>markus