# ----------------------------------------------------------------------------- #
#         File: widgetmenu.rb
#  Description: a module that displays a menu for customization of a field
#               e.g.,
#               field.extend(WidgetMenu)
#
#       Author: rkumar http://github.com/rkumar/rbcurse/
#         Date: 2011-12-2x
#      License: Same as Ruby's License (http://www.ruby-lang.org/LICENSE.txt)
#  Last update: 2011-12-26 - 20:25
# ----------------------------------------------------------------------------- #
#
# Provide a system for us to define a menu for customizing a widget, such that
# applicatin can also add more menuitems
module RubyCurses
  extend self
  module WidgetMenu
    include Io # added 2011-12-26
    # add a menu item which can any one of
    # @param key, label, desc, action | symbol
    #        key, symbol
    #        Action
    #        Action[] (maybe)
    def self.extended(obj)
      # don't want this executed each time
      @objects ||= []
      return if @objects.include? obj
      @objects << obj

      obj.instance_exec {
        @_menuitems ||= []
        # callign this method means that no other programs can use those actions else
        # that method will be called more than once, so it must either be called in the constructor
        # or else have a check that it is only called once.
        obj.init_menu if obj.respond_to? :init_menu
      }

    end
    def add_menu_item *val
      #@_menuitems ||= []
      @_menuitems << val
    end
    #
    # insert an item at given position (index)
    def insert_menu_item pos, *val
      #@_menuitems ||= []
      @_menuitems[pos] = val
    end
    def create_menuitem *args
      PromptMenu.create_menuitem *args
    end

    # popup the hist
    #
    def _show_menu
      return if @_menuitems.nil? || @_menuitems.empty?
      list = @_menuitems
      menu = PromptMenu.new self do |m|
      list.each { |e|
        m.add *e
      }
      end
      menu.display_new :title => 'Widget Menu (Press letter)'
    end
  end # mod History
end # mod RubyC