[RGSS2] Window Item Edit

#==============================================================================
# ** Window_Item
#------------------------------------------------------------------------------
#  This window displays a list of inventory items for the item screen, etc.
#==============================================================================

class Window_Item < Window_Selectable
  #--------------------------------------------------------------------------
  # * Object Initialization
  #     x      : window x-coordinate
  #     y      : window y-coordinate
  #     width  : window width
  #     height : window height
  #--------------------------------------------------------------------------
  def initialize(x, y, width, height)
    super(x, y, width, height)
    @column_max = (width-32)/WLH
    self.index = 0
    refresh
  end
  #--------------------------------------------------------------------------
  # * Refresh
  #--------------------------------------------------------------------------
  def refresh
    @data = []
    $game_party.items.each {|item|
      next unless include?(item)
      $game_party.item_number(item).times {@data << item}
      if item.is_a?(RPG::Item) && item.id == $game_party.last_item_id
        self.index = @data.size - 1
      end}
    @data.push(nil) if include?(nil)
    @item_max = @data.size
    create_contents
    @data.each_index{|i| draw_item(i)}
  end
  #--------------------------------------------------------------------------
  # * Draw Item
  #     index : item number
  #--------------------------------------------------------------------------
  def draw_item(index)
    rect = item_rect(index)
    self.contents.clear_rect(rect)
    item = @data[index]
    draw_icon(item.icon_index, rect.x, rect.y, enable?(item))
  end
  #--------------------------------------------------------------------------
  # * Get rectangle for displaying items
  #     index : item number
  #--------------------------------------------------------------------------
  def item_rect(index)
    rect = Rect.new(0, 0, 0, 0)
    rect.width = WLH
    rect.height = WLH
    rect.x = index % @column_max * WLH
    rect.y = index / @column_max * WLH
    return rect
  end
  #--------------------------------------------------------------------------
  # * Update Help Text
  #--------------------------------------------------------------------------
  def update_help
    @help_window.set_text(item == nil ? "" : item.name+' : '+item.description)
  end
end