Forum: wxRuby how to display ListCtrl_virtual using xrcise

Hi,

I'm trying to display text in a ListCtrl_virtual using xrcise.
To display text, I implemented on_get_item_text() method in TestListCtrl
module.
However, no text displayed in my list.
I'd appreciate it if you could teach me how to display text.

My environment:
> ruby -v
ruby 1.8.7 (2009-06-12 patchlevel 174) [i386-mswin32]
> gem list
*** LOCAL GEMS ***
wx_sugar (0.1.22)
wxruby (2.0.1)

Here is my sample code:
- testlistctrl.xrc
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<resource xmlns="http://www.wxwindows.org/wxxrc" version="2.3.0.1">
        <object class="wxFrame" name="TestFrame"
subclass="TestFrameBase">
                <style>wxDEFAULT_FRAME_STYLE|wxTAB_TRAVERSAL</style>
                <size>500,300</size>
                <title></title>
                <object class="wxListCtrl" name="m_listCtrl3"
subclass="TestListCtrl">
                        <style>wxLC_REPORT|wxLC_VIRTUAL</style>
                </object>
        </object>
</resource>

- testlistctrlbase.rb (xrcise output)
class TestFrameBase < Wx::Frame

        attr_reader :m_listctrl3

        def initialize(parent = nil)
                super()
                xml = Wx::XmlResource.get
                xml.flags = 2 # Wx::XRC_NO_SUBCLASSING
                xml.init_all_handlers
                xml.load("testlistctrl.xrc")
                xml.load_frame_subclass(self, parent, "TestFrame")

                finder = lambda do | x |
                        int_id = Wx::xrcid(x)
                        begin
                                Wx::Window.find_window_by_id(int_id,
self) || int_id
                        # Temporary hack to work around regression in
1.9.2; remove
                        # begin/rescue clause in later versions
                        rescue RuntimeError
                                int_id
                        end
                end

                @m_listctrl3 = finder.call("m_listCtrl3")
                @m_listctrl3.extend(TestListCtrl)
                if self.class.method_defined? "on_init"
                        self.on_init()
                end
        end
end

- testlistctrl.rb (main)
#!/usr/bin/ruby

require 'rubygems'
require 'wx'

require 'testlistctrlbase.rb'

module TestListCtrl
  def on_init
    insert_column(0, 'first')
    insert_column(1, 'second')

    self.item_count = 10
  end

  def on_get_item_text(item, col)
    'foo'
  end
end

class TestFrame < TestFrameBase
  def initialize
    super
  end

  def on_init
    @m_listctrl3.on_init
#    @m_listctrl3.refresh_items(0, 9)
  end
end

class TestApp < Wx::App
  def on_init
    f = TestFrame.new.show
    return true
  end
end

TestApp.new.main_loop


Regards,
Ken Uraya

On 18/04/2010 13:10, Ken Uraya wrote:

> I'm trying to display text in a ListCtrl_virtual using xrcise.
> To display text, I implemented on_get_item_text() method in TestListCtrl
> module.
> However, no text displayed in my list.
> I'd appreciate it if you could teach me how to display text.
>    

I can't test this right now, but looking over your code, a couple of
things to try:

- don't use on_init to do start up - just call the superclass
constructor then carry on.

- you may need to do set_column_width to set out the columns

a

Hi Alex,

Thank you very much for your reply.
I applied your two suggestions to my program.
However the result was the same.

Here is my modified sample code:
#!/usr/bin/ruby

require 'rubygems'
require 'wx'

require 'testlistctrlbase.rb'

module TestListCtrl
  def set_list_ctrl
    insert_column(0, 'first')
    insert_column(1, 'second')

    self.set_column_width(0, 250)
    self.set_column_width(1, 250)

    self.item_count = 10
  end

  def on_get_item_text(item, col)
    'foo'
  end
end

class TestFrame < TestFrameBase
  def setup
    @m_listctrl3.set_list_ctrl
  end
end

class TestApp < Wx::App
  def on_init
    f = TestFrame.new
    f.setup
    f.show
    return true
  end
end

TestApp.new.main_loop


Regards,
Ken Uraya