[squeak-dev] how to extend a class (add methods) and have the source of the methods be in a category other than the one the class is defined in?

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Fri Jan 13 17:53:23 UTC 2017

Hi Louis,
if the purpose is packaging code for loading/unloading/versioning, then the
usage is to create a package via Monticello, say


Then any class classified into a category 'LouisApp', 'LouisApp-Base' or
'LouisApp-Whatever' would belong to the 'LouisApp' package.
And any method classified into a category '*LouisApp',
'*LouisApp-accessing' or '*LouisApp-WhatYouPrefer' would also belong to the
'LouisApp' package. That's how we would package some extension to another
class not in our package.

That's a very low cost but effective convention.

2017-01-13 18:38 GMT+01:00 Louis LaBrunda <Lou at keystone-software.com>:

> Hi Bob,
> Thanks for the prompt reply.  I'm still a little confused.  Allow me to
> describe what we do in
> VA Smalltalk and see if we can get the same results in Squeak.
> VA Smalltalk has a class called Application.  Applications are similar (I
> think) to Class
> categories (the first pane on the left).  Classes can appear in more than
> one Application. Each
> Application a class appears in holds some methods.  A class starts out
> being defined in one
> application.  It is "extended" by adding methods to other applications.
> If one of those
> applications is not loaded, then the extended methods are not available.
> I have created a Class category to hold my program.  As part of the
> program I want to add a few
> methods to say the String class.  But I'm afraid I will add them to the
> class category where
> String is defined.
> Does this make sense and how do I do it in Squeak?
> Lou
> On Fri, 13 Jan 2017 12:18:37 -0500, Bob Arning <arning315 at comcast.net>
> wrote:
> >Class categories (the first pane on the left at the top of a system
> >browser) are completely different from method categories (third pane
> >from the left). Assuming you are talking about method categories, you can:
> >
> >- select the desired method category before you enter and save the method
> >
> >- if it's already in the wrong category...
> >
> >-- drag the method name from the fourth pane into the third pane at the
> >desired category
> >
> >-- copy the method source, select the desired category, paste the method
> >source back in and save
> >
> >-- choose "reorganize" from the third pane menu
> >
> >
> >On 1/13/17 11:55 AM, Louis LaBrunda wrote:
> >> Hi All,
> >>
> >> How does one extend a class (add methods) and have the source of the
> methods be in a category
> >> other than the one the class is originally defined in?  I expect this
> is simple and I'm just
> >> missing something easy.
> >>
> >> Lou
> --
> Louis LaBrunda
> Keystone Software Corp.
> SkypeMe callto://PhotonDemon
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