#!/usr/bin/env ruby

begin
  require 'wx'
rescue LoadError => no_wx_err
  begin
    require 'rubygems'
    require 'wx'
  rescue LoadError
    raise no_wx_err
  end
end

class TestVirtualList < Wx::ListCtrl
    def initialize(parent, log)
        super(parent, -1, Wx::DEFAULT_POSITION, Wx::DEFAULT_SIZE, Wx::LC_REPORT | Wx::LC_VIRTUAL | Wx::LC_HRULES | Wx::LC_VRULES)
        @log = log
        
        @il = Wx::ImageList.new(16,16)
        bmp_file = File.join(File.dirname(__FILE__), "icons/wxwin16x16.xpm")
        
        @idx1 = @il.add(Wx::Bitmap.new(bmp_file))
        set_image_list(@il, Wx::IMAGE_LIST_SMALL)
        
        insert_column(0,"First")
        insert_column(1,"Second")
        insert_column(2,"Third")
        set_column_width(0,175)
        set_column_width(1,175)
        set_column_width(2,175)
        
        set_item_count(1000000)
        
        @attr1 = Wx::ListItemAttr.new()
        @attr1.set_background_colour(Wx::Colour.new("YELLOW"))
        
        @attr2 = Wx::ListItemAttr.new()
        @attr2.set_background_colour(Wx::Colour.new("LIGHT BLUE"))
        
        evt_list_item_selected(get_id()) {|event| on_item_selected(event)}
        evt_list_item_activated(get_id()) {|event| on_item_activated(event)}
        evt_list_item_deselected(get_id()) {|event| on_item_deselected(event)}
    end
    
    def on_item_selected(event)
        @currentItem = event.get_index()
        @item = event.get_item()
        get_column(1,@item)
        
        @log.write_text('on_item_selected: "%s", "%s", "%s", "%s"' % [@currentItem, get_item_text(@currentItem), 
                            @item.get_text(), get_column(2,@item) ? @item.get_text() : nil])
    end
    
    def on_item_activated(event)
        @currentItem = event.get_index()
        @log.write_text("on_item_activated: %s\nTopItem: %s" % [get_item_text(@currentItem), get_top_item()])
    end
    
    def on_item_deselected(event)
        @log.write_text("on_item_deselected: %s" % event.get_index())
    end
    
     #---------------------------------------------------
    # These methods are callbacks for implementing the
    # "virtualness" of the list...  Normally you would
    # determine the text, attributes and/or image based
    # on values from some external data source, but for
    # this demo we'll just calculate them
    
    def on_get_item_text(item, col)
        return "Item %d, column %d" % [item,col]
    end
    
    def on_get_item_image(item)
        if item % 3 == 0
            return @idx1
        else
            return -1
        end
    end
    
    def on_get_item_attr(item)
        if item % 3 == 1
            return @attr1
        elsif item % 3 == 2
            return @attr2
        else 
            return nil
        end
    end
end

module Demo
    def Demo.run(frame, nb, log)
        win = TestVirtualList.new(nb,log)
        return win
    end

    def Demo.overview
        return "A special case of report view quite different from the other modes of the list control is a virtual control in which the items data (including text, images and attributes) is managed by the main program and is requested by the control itself only when needed which allows to have controls with millions of items without consuming much memory. To use virtual list control you must use SetItemCount first and overload at least OnGetItemText (and optionally OnGetItemImage and OnGetItemAttr) to return the information about the items when the control requests it."
    end
end
    

if __FILE__ == $0
  run_solo_lib = File.join( File.dirname(__FILE__), 'run.rb')
  load run_solo_lib
  run File.basename($0)
end