svn/view/event_manager.rb

#
# Edmaru: A scalable editor implemented by Ruby.
# Copyright (C) 2007 Takashi Nakamoto
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
#

require "event_handler/event_handler.rb"

module Edmaru

  #The controller to manage event handlers.
  class EventManager

    #Create an event manager.
    #
    #=== Return
    #An initialized manager.
    def initialize
      @current_handler = nil
    end

    #Set the handler whose name is _handler_name_ as the current handler
    #
    #=== Argument
    #_handler_ :: An instance of Edmaru::EventHandler to be added.
    def set_current_handler(handler)
      @current_handler = handler
    end

    #Make the current handler to handle the specified event.
    #
    #=== Argument
    #_event_name_ :: A String instance representing the event name.
    def handle(event_name)
      if @current_handler != nil
        @current_handler.handle(event_name)
      else
        raise "Event handler has not been registered yet!"
      end
    end
  end
end