Item Button Mapping

  KEY_MAP = {
    0 => Input::NUMBERS[6],
    1 => Input::NUMBERS[7],
    2 => Input::NUMBERS[8],
    3 => Input::NUMBERS[9],
    4 => Input::NUMBERS[0]
  }

  def update_item_selection
    if Input.trigger?(Input::B)
      Sound.play_cancel
      return_scene
    elsif Input.trigger?(Input::C)
      @item = @item_window.item
      if @item != nil
        $game_party.last_item_id = @item.id
      end
      if $game_party.item_can_use?(@item)
        Sound.play_decision
        determine_item
      else
        Sound.play_buzzer
      end
    else
      KEY_MAP.each_pair { |key, value|
        if Input.trigger?( value )
          Sound.play_decision()
          id = @item_window.item.nil?() ? 0 : @item_window.item.id
          $game_actors[1].set_item_slot( key, id )
        end
      }
    end
  end