require 'gtk2'

class OpenFileDialog < Gtk::FileChooserDialog
  @@CWD = nil

  def initialize(parent_window)
    super("Open file", parent_window, 
          Gtk::FileChooser::ACTION_OPEN, nil, 
          [Gtk::Stock::CANCEL, Gtk::Dialog::RESPONSE_CANCEL],
          [Gtk::Stock::OPEN, Gtk::Dialog::RESPONSE_OK])

    self.default_response = Gtk::Dialog::RESPONSE_OK

    self.current_folder = @@CWD unless @@CWD.nil?

    signal_connect :response do |dialog, response|
      @@CWD = self.current_folder if response == Gtk::Dialog::RESPONSE_OK
    end
  end
end

2.times do
  d = OpenFileDialog.new(nil)

  d.run do |response|
    puts "filename = #{d.filename}" if response == Gtk::Dialog::RESPONSE_OK
  end

  d.destroy
end