# WxRuby "source code" **URL:** \ **Category:** Ruby\ **Created:** [April 29, 2009, 8:50pm UTC](https://www.ruby-forum.com/t/wxruby-source-code/166816 "2009-04-29T20:50:13Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![pitosalas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a4c791/32.png) [@pitosalas](https://www.ruby-forum.com/u/pitosalas)\ **Post date:** [April 29, 2009, 8:50pm UTC](https://www.ruby-forum.com/t/wxruby-source-code/166816/1 "2009-04-29T20:50:13Z")
I was trying to figure out what the correct parameters are for ScrolledWindow.new. In the doc I saw some detrails ([http://wxruby.rubyforge.org/doc/scrolledwindow.html#ScrolledWindow\_new](http://wxruby.rubyforge.org/doc/scrolledwindow.html#ScrolledWindow_new)) but I still couldnt see what I was doing wrong. So I looked at the sources for the gem, and found no explicit definition of the class and methods, but a mention of wxruby2, the ‘binary library’. What’s that? Then looking deeper I found the wxruby2 gem’s sources, where again no explicit mention about ScrolledWindow.new. It looks to me like wxruby2 is a ruby “api” to the underlying c library. There’s mention of Swig, what’s that? And then within wxruby2/swig/classes/scrolledwindow.i I find this inscrutable stuff (see below)… Does that somehow explain what the RUBY parameters are for ScrolledWindow? I think I am almost but not grasping the mapping. Can anyone clarify or point me to a clarification? Thanks! Pito ----- Referenced above ----- // Copyright 2004-2008, wxRuby development team // released under the MIT-like wxRuby2 license %include “…/common.i” %{ #include \ %} %module(directors=“1”) wxScrolledWindow GC\_MANAGE\_AS\_WINDOW(wxScrolledWindow); SWIG\_WXWINDOW\_NO\_USELESS\_VIRTUALS(wxScrolledWindow); %apply int \* OUTPUT { int \* } %import “include/wxObject.h” %import “include/wxEvtHandler.h” %import “include/wxWindow.h” %import “include/wxPanel.h” %include “include/wxScrolledWindow.h” ---
**Author:** ![pitosalas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a4c791/32.png) [@pitosalas](https://www.ruby-forum.com/u/pitosalas)\ **Post date:** [April 29, 2009, 9:41pm UTC](https://www.ruby-forum.com/t/wxruby-source-code/166816/2 "2009-04-29T21:41:22Z")
On Wednesday 29 April 2009, Pito S. wrote: > | > |Then looking deeper I found the wxruby2 gem’s sources, where again no > |explicit mention about ScrolledWindow.new. It looks to me like wxruby2 > |is a ruby “api” to the underlying c library. There’s mention of Swig, > |what’s that? You’re right, wxruby2 is a ruby binding to the WxWidgets C++ library ([http://wxwidgets.org/](http://wxwidgets.org/)). Swig ([http://www.swig.org/](http://www.swig.org/)) is a tool which makes eaiser to generate bindings from C(++) to several other language, including ruby by automatically create some of the code needed to do so. The scrolledwindow.i file you mention below is one of the files needed by Swig and, if I’m not mistaken (I’ve never used Swig myself) it plays a role similar to those of .h files in C. As for your problem, I think the wxwidgets web site may have some more documentation, but it will be for C++, so there will be differences from ruby. Other than that, you can ask on the wxruby mailing list ([http://wxruby.rubyforge.org/wiki/wiki.pl?MailingLists](http://wxruby.rubyforge.org/wiki/wiki.pl?MailingLists)), or even here. In any case, you’ll need to post the code which causes the problem, or at least explain what the problem is and post any error message you think relevant. I hope this helps Stefano ---
**Author:** ![pitosalas](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a4c791/32.png) [@pitosalas](https://www.ruby-forum.com/u/pitosalas)\ **Post date:** [April 30, 2009, 12:10am UTC](https://www.ruby-forum.com/t/wxruby-source-code/166816/3 "2009-04-30T00:10:54Z")
Pito S. wrote: > I was trying to figure out what the correct parameters are for > ScrolledWindow.new. > > In the doc I saw some detrails > ([http://wxruby.rubyforge.org/doc/scrolledwindow.html#ScrolledWindow\_new](http://wxruby.rubyforge.org/doc/scrolledwindow.html#ScrolledWindow_new)) > but I still couldnt see what I was doing wrong. The parameters in the docs are correct I think. After you create the ScrolledWindow you need to set up the scroll bars (eg using set\_virtual\_size and set\_scroll\_rate) as described at the top of the doc page. There are examples of using ScrolledWindow in the samples (though the sample is a bit over-elaborate), or here: [http://weft-qda.rubyforge.org/svn/trunk/weft-qda/lib/weft/wxgui/controls/image\_viewer.rb](http://weft-qda.rubyforge.org/svn/trunk/weft-qda/lib/weft/wxgui/controls/image_viewer.rb) As Stefan says, you can get help on the mailing list if you post some code, and a description of an error message or what’s not working. > So I looked at the sources for the gem, and found no explicit definition > of the class and methods, but a mention of wxruby2, the ‘binary > library’. What’s that? It’s the compiled file (called wxruby2.so or similar) which provides most of the core wxRuby API. > Then looking deeper I found the wxruby2 gem’s sources, where again no > explicit mention about ScrolledWindow.new. It looks to me like wxruby2 > is a ruby “api” to the underlying c library. There’s mention of Swig, > what’s that? > > And then within wxruby2/swig/classes/scrolledwindow.i I find this > inscrutable stuff (see below)… Does that somehow explain what the > RUBY parameters are for ScrolledWindow? Partly, and also a file included from there, swig/classes/include/wxScrolledWindow.h, and various other inscrutable bits of SWIG stuff. For learning and using the API I would definitely stick to the samples and docs which should cover all the API, and feel free to ask for help on the list. alex