wxruby users - Nov 2007 - xrcise tutorial, undefined method ''upper_bt''

Hi
I''m trying to follow the tutorial on xrcise at
http://wxruby.rubyforge.org/wiki/wiki.pl?UsingXRCise

But I keep getting the following error when I try to run the example;
tutorial.rb:21:in `initialize'': undefined method
''upper_bt'' for
#<CaseChangeFrame:0x2d610f8> (NoMethodError)
        from tutorial.rb:28:in `new''
        from tutorial.rb:28:in `on_init''
        from
c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32/lib/wx/classes/app.rb:16:in
`main_loop''
        from
c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32/lib/wx/classes/app.rb:16:in
`run''
        from tutorial.rb:27

The relevant ruby code looks like.

 # Inherit from the generated base class and set up event handlers
 class CaseChangeFrame < TextFrameBase
   def initialize
     super
     evt_button(upper_bt) { text_box.upcase! }
     evt_button(lower_bt) { text_box.downcase! }
   end
 end

I have triple checked that I have given the button widget an Id name of
upper_bt in DialogBlocks

Has anyone come across this before?

Thanks
Tim


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Hi Tim

Tim Field wrote:
> I''m trying to follow the tutorial on xrcise at
> http://wxruby.rubyforge.org/wiki/wiki.pl?UsingXRCise
>
> But I keep getting the following error when I try to run the example;
> tutorial.rb:21:in `initialize'': undefined method
''upper_bt'' for
> #<CaseChangeFrame:0x2d610f8> (NoMethodError)
>         from tutorial.rb:28:in `new''
>         from tutorial.rb:28:in `on_init''
>         from 
>
c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32/lib/wx/classes/app.rb:16:in
> `main_loop''
>         from 
>
c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32/lib/wx/classes/app.rb:16:in
> `run''
>         from tutorial.rb:27
Thanks for the report. Hard to say what''s going on here - could you
post
the my_frame.xrc that you''re running XRCise against, and also the 
my_frame.rb that''s been generated?

alex

To my eyes, this looks like a simple syntax slip.  The argument to
evt_button is being interpreted as a method call, not a symbol as intended.
Note the colons:

evt_button(:upper_bt) { text_box.upcase! }
evt_button(:lower_bt) { text_box.downcase! }

- Ash

On 11/2/07, Alex Fenton <alex at pressure.to>
wrote:
>
> Hi Tim
>
> Tim Field wrote:
> > I''m trying to follow the tutorial on xrcise at
> > http://wxruby.rubyforge.org/wiki/wiki.pl?UsingXRCise
> >
> > But I keep getting the following error when I try to run the example;
> > tutorial.rb:21:in `initialize'': undefined method
''upper_bt'' for
> > #<CaseChangeFrame:0x2d610f8> (NoMethodError)
> >         from tutorial.rb:28:in `new''
> >         from tutorial.rb:28:in `on_init''
> >         from
> > c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> > `main_loop''
> >         from
> > c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> > `run''
> >         from tutorial.rb:27
> Thanks for the report. Hard to say what''s going on here - could
you post
> the my_frame.xrc that you''re running XRCise against, and also the
> my_frame.rb that''s been generated?
>
> alex
> _______________________________________________
> wxruby-users mailing list
> wxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/wxruby-users
>
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Ash Wilson wrote:
> To my eyes, this looks like a simple syntax slip.  The argument to 
> evt_button is being interpreted as a method call, not a symbol as 
> intended.  Note the colons:
>
> evt_button(:upper_bt) { text_box.upcase! }
> evt_button(:lower_bt) { text_box.downcase! }
The first argument to evt_button, as to the other event handlers that 
capture commands from Controls, is a Window or a Window id that is the 
source of the vents

So these should be methods which return a Wx::Button

alex

Hi Alex

Thanks for taking a look, Here are the files, I also tried the syntax
changes mentioned by Ash but this didn''t work either,
resulted in this error.
Must specify Wx::Window event source or its Wx id, not
'':upper_bt''
(ArgumentError)
I''m fairly new to ruby syntax so it wouldn''t be beyond me to
have such a
problem but seems its something else

Tim

On 11/3/07, Alex Fenton <alex at pressure.to>
wrote:
>
> Hi Tim
>
> Tim Field wrote:
> > I''m trying to follow the tutorial on xrcise at
> > http://wxruby.rubyforge.org/wiki/wiki.pl?UsingXRCise
> >
> > But I keep getting the following error when I try to run the example;
> > tutorial.rb:21:in `initialize'': undefined method
''upper_bt'' for
> > #<CaseChangeFrame:0x2d610f8> (NoMethodError)
> >         from tutorial.rb:28:in `new''
> >         from tutorial.rb:28:in `on_init''
> >         from
> > c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> > `main_loop''
> >         from
> > c:/ruby/lib/ruby/gems/1.8/gems/wxruby-1.9.2-i386-mswin32
> /lib/wx/classes/app.rb:16:in
> > `run''
> >         from tutorial.rb:27
> Thanks for the report. Hard to say what''s going on here - could
you post
> the my_frame.xrc that you''re running XRCise against, and also the
> my_frame.rb that''s been generated?
>
> alex
> _______________________________________________
> wxruby-users mailing list
> wxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/wxruby-users
>
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Hey Tim and Alex,

Tim Field wrote:
> Hi Alex
>
> Thanks for taking a look, Here are the files, I also tried the syntax 
> changes mentioned by Ash but this didn''t work either,
> resulted in this error.
> Must specify Wx::Window event source or its Wx id, not
'':upper_bt''
> (ArgumentError)
> I''m fairly new to ruby syntax so it wouldn''t be beyond me
to have such
> a problem but seems its something else
>
> Tim
Wow, must be one of the first fast ones I''ve actually debugged here.  
I''ve done my own debugging, and it looks like, your trying to setup the
ID for your objects, and they haven''t even been defined yet.  And for 
you Alex, in order to access "finder"  You should proabbly store that
as
a Method Call, or store it as a Class Variable, so that it can be 
accessed, in this sistuation.

Anyways, the core problem, is first, for the method at which your 
generating the code, and adding to it, you need to change the "finder"
variable in my_frame.rb  in TestFrameBase#initialize() to a class 
variable, so it can be accessed by sub-classed versions of the 
TestFrameBase.  You can do this easily by just adding an ''@''
symbol to
it.  Nothing to it really.

Next, in your sub-classed version in tutorial.rb, I made a few changes.  
Basically, I added the three calls to 
@finder.call("id_we_are_looking_for") for upper_bt, lower_bt, and 
text_box, then changed the upcase and downcase to the following: 
text_box.value = text_box.value.upcase/downcase As you can modify the 
string with upcase!/downcase!, but it doesn''t modify it in the wxRuby 
Buffer, so you need to re-assign it to the buffer, so that it will 
convert over properly for you, and display the changes.  The New code 
goes as follows:

======================my_frame.rb======================
# This class was automatically generated from XRC source. It is not
# recommended that this file is edited directly; instead, inherit from
# this class and extend its behaviour there. 
#
# Source file: tutorial.xrc
# Generated at: Sat Nov 03 13:22:37 +1300 2007

class TextFrameBase < Wx::Frame
 
  def initialize(parent = nil)
    super()
    xml = Wx::XmlResource.get
    xml.flags = 2 # Wx::XRC_NO_SUBCLASSING
    xml.init_all_handlers
    xml.load("tutorial.xrc")
    xml.load_frame_subclass(self, parent, "ID_WXFRAME")

    @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

  end
end

=====================tutorial.rb==========================require
''wx''
 # load in the generated code
 require ''my_frame''

 # Mix-in for a Wx::TextCtrl
 module CaseChangeTextCtrl
   # convert all the text in the control to upper case
   def upcase!
     self.value = self.value.upcase
   end
   # convert all the text in the control to lower case
   def downcase!
     self.value = self.value.downcase
   end
 end
 
  # Inherit from the generated base class and set up event handlers
 class CaseChangeFrame < TextFrameBase
   def initialize
     super
     upper_bt = @finder.call("upper_bt")
     lower_bt = @finder.call("lower_bt")
     text_box = @finder.call("text_box")
     evt_button(upper_bt) { text_box.value = text_box.value.upcase }
     evt_button(lower_bt) { text_box.value = text_box.value.downcase }
   end
 end
 
  # Run the class
 Wx::App.run do
   CaseChangeFrame.new.show
 end


===========================================================
Enjoy the new code, and Alex, you should look into this, incase someone 
decides they want to do something similar to this.  This would exactly 
be the way that I would want to do it.

L8ers,

Mario Steele

Hi Mario

Wow thanks for that sure enough it works!

Do you think the tutorial at
http://wxruby.rubyforge.org/wiki/wiki.pl?UsingXRCise should be updated,
I''m
surprised this hasn''t been an issue for someone else?

Also I was thinking in php (i work with php for a living) there are
special get and set methods you can define which are only triggered when
your object or inherited object doesn''t contain the member or method
you''re
trying to access. (http://nz.php.net/manual/en/language.oop5.overloading.php
)

so in this example in php I would write something like.

function __get($name){
   if($element = $this->finder($name))
            return $element;
   trigger_error("undefined property $name");
}

Maybe such a function would be useful in the base class in the tutorial
example to look up the form elements thus preventing the need for the
"upper_bt = @finder.call("upper_bt")" lines.

Anyway I had a good look at the ruby manual I have and couldn''t find a
way
to do this, I''m sure there is? or perhaps you guys can think of a more
elegant solution?

Thanks again for helping me though that issue guys!

Tim

On 11/3/07, Mario Steele <mario at ruby-im.net>
wrote:
>
> Hey Tim and Alex,
>
> Tim Field wrote:
> > Hi Alex
> >
> > Thanks for taking a look, Here are the files, I also tried the syntax
> > changes mentioned by Ash but this didn''t work either,
> > resulted in this error.
> > Must specify Wx::Window event source or its Wx id, not
'':upper_bt''
> > (ArgumentError)
> > I''m fairly new to ruby syntax so it wouldn''t be
beyond me to have such
> > a problem but seems its something else
> >
> > Tim
>
> Wow, must be one of the first fast ones I''ve actually debugged
here.
> I''ve done my own debugging, and it looks like, your trying to
setup the
> ID for your objects, and they haven''t even been defined yet.  And
for
> you Alex, in order to access "finder"  You should proabbly store
that as
> a Method Call, or store it as a Class Variable, so that it can be
> accessed, in this sistuation.
>
> Anyways, the core problem, is first, for the method at which your
> generating the code, and adding to it, you need to change the
"finder"
> variable in my_frame.rb  in TestFrameBase#initialize() to a class
> variable, so it can be accessed by sub-classed versions of the
> TestFrameBase.  You can do this easily by just adding an
''@'' symbol to
> it.  Nothing to it really.
>
> Next, in your sub-classed version in tutorial.rb, I made a few changes.
> Basically, I added the three calls to
> @finder.call("id_we_are_looking_for") for upper_bt, lower_bt, and
> text_box, then changed the upcase and downcase to the following:
> text_box.value = text_box.value.upcase/downcase As you can modify the
> string with upcase!/downcase!, but it doesn''t modify it in the
wxRuby
> Buffer, so you need to re-assign it to the buffer, so that it will
> convert over properly for you, and display the changes.  The New code
> goes as follows:
>
> ======================my_frame.rb======================>
> # This class was automatically generated from XRC source. It is not
> # recommended that this file is edited directly; instead, inherit from
> # this class and extend its behaviour there.
> #
> # Source file: tutorial.xrc
> # Generated at: Sat Nov 03 13:22:37 +1300 2007
>
> class TextFrameBase < Wx::Frame
>
> def initialize(parent = nil)
>    super()
>    xml = Wx::XmlResource.get
>    xml.flags = 2 # Wx::XRC_NO_SUBCLASSING
>    xml.init_all_handlers
>    xml.load("tutorial.xrc")
>    xml.load_frame_subclass(self, parent, "ID_WXFRAME")
>
>    @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
>
> end
> end
>
> =====================tutorial.rb==========================> require
''wx''
> # load in the generated code
> require ''my_frame''
>
> # Mix-in for a Wx::TextCtrl
> module CaseChangeTextCtrl
>   # convert all the text in the control to upper case
>   def upcase!
>     self.value = self.value.upcase
>   end
>   # convert all the text in the control to lower case
>   def downcase!
>     self.value = self.value.downcase
>   end
> end
>
> # Inherit from the generated base class and set up event handlers
> class CaseChangeFrame < TextFrameBase
>   def initialize
>     super
>     upper_bt = @finder.call("upper_bt")
>     lower_bt = @finder.call("lower_bt")
>     text_box = @finder.call("text_box")
>     evt_button(upper_bt) { text_box.value = text_box.value.upcase }
>     evt_button(lower_bt) { text_box.value = text_box.value.downcase }
>   end
> end
>
> # Run the class
> Wx::App.run do
>   CaseChangeFrame.new.show
> end
>
>
> ===========================================================>
> Enjoy the new code, and Alex, you should look into this, incase someone
> decides they want to do something similar to this.  This would exactly
> be the way that I would want to do it.
>
> L8ers,
>
> Mario Steele
> _______________________________________________
> wxruby-users mailing list
> wxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/wxruby-users
>
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Hi Tim

Tim Field wrote:
>
> Thanks for taking a look, Here are the files, I also tried the syntax 
> changes mentioned by Ash but this didn''t work either, 
As Mario says, it''s the missing finder calls that are the problem, but 
these should be in the autogenerated base class, not the user class 
you''re writing. Finder is meant to be a private implementation detail.

There is something strange going on because when I run xrcise over the 
xrc file you sent, it does generate the missing lines in my_frame.rb

  attr_reader :text_box, :upper_bt, :lower_bt

...

    @text_box = finder.call("text_box")
    @text_box.extend(CaseChangeTextCtrl)
    @upper_bt = finder.call("upper_bt")
    @lower_bt = finder.call("lower_bt")

Please could you double-check you''re running xrcise over the latest 
saved version of your xrc file, as you posted it here.

If those lines are still not showing up, could you say what ruby version 
and platform you''re on.

thanks
alex

thanks
alex

Tim Field wrote:
> Also I was thinking in php (i work with php for a living) there are 
> special get and set methods you can define which are only triggered 
> when your object or inherited object doesn''t contain the member or
> method you''re trying to access. ( 
> http://nz.php.net/manual/en/language.oop5.overloading.php)
Object#method_missing is what you''re looking for.

class Foo
  def method_missing(meth, *args)
    puts "Called non-existing method ''#{meth}'' with
arguments
''#{args.join('','')}''"
  end
end

It''s best used with discretion, because it breaks reflection on an 
object''s supported methods eg,

Foo.new.respond_to?(:blah)
=> false

Even if ''blah'' would be a valid method call.

cheers
alex

Hi Alex,

Those lines definitely aren''t showing up. (when using that xrc file or
another one I have)

I''m running ruby 1.8.6 on winxp

-Tim

On 11/4/07, Alex Fenton <alex at pressure.to>
wrote:
>
> Hi Tim
>
> Tim Field wrote:
> >
> > Thanks for taking a look, Here are the files, I also tried the syntax
> > changes mentioned by Ash but this didn''t work either,
> As Mario says, it''s the missing finder calls that are the problem,
but
> these should be in the autogenerated base class, not the user class
> you''re writing. Finder is meant to be a private implementation
detail.
>
> There is something strange going on because when I run xrcise over the
> xrc file you sent, it does generate the missing lines in my_frame.rb
>
>   attr_reader :text_box, :upper_bt, :lower_bt
>
> ...
>
>     @text_box = finder.call("text_box")
>     @text_box.extend(CaseChangeTextCtrl)
>     @upper_bt = finder.call("upper_bt")
>     @lower_bt = finder.call("lower_bt")
>
> Please could you double-check you''re running xrcise over the
latest
> saved version of your xrc file, as you posted it here.
>
> If those lines are still not showing up, could you say what ruby version
> and platform you''re on.
>
> thanks
> alex
>
> thanks
> alex
>
>
>
> _______________________________________________
> wxruby-users mailing list
> wxruby-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/wxruby-users
>
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Tim

Tim Field wrote:
> Those lines definitely aren''t showing up. (when using that xrc
file or
> another one I have)
>
> I''m running ruby 1.8.6 on winxp
I couldn''t reproduce the bug with XP/1.8.4, but I tried installing the 
latest 1.8.6 and now can.

It''s due to some incompatible change in REXML shipped with ruby 1.8.4 
(version 3.1.3) and 1.8.6 (version 3.1.6), somewhere in it''s XPath 
parsing, but exactly what''s needed is eluding me right now.

Anyway, thanks again for the report. We should be able to pin down 
what''s up and put out a version of wxSugar inc XRCise that works on 
1.8.6 in the next week or so.

alex

Alex Fenton wrote:
> I couldn''t reproduce the bug with XP/1.8.4, but I tried installing
the
> latest 1.8.6 and now can.
> 
> It''s due to some incompatible change in REXML shipped with ruby
1.8.4
> (version 3.1.3) and 1.8.6 (version 3.1.6), somewhere in it''s XPath
> parsing, but exactly what''s needed is eluding me right now.
> 
> Anyway, thanks again for the report. We should be able to pin down
> what''s up and put out a version of wxSugar inc XRCise that works
on
> 1.8.6 in the next week or so.
> 
> alex
Hey I get the same thing... running 1.8.6 on Mac OS X 10.5.2. Got a gem 
of the latest wxSugar 0.1.20 but this still seems to be an issue in this 
version.

Anyone know?

Thx!
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