21 Mar
2008
21 Mar
'08
6:24 p.m.
This is a question for Lukas.
I need to display an object of class A that holds a collection of other
objects of class B.
The collection is described using a subclass of
MAToManyRelationDescription.
The description of the objects in class B needs to be instance based.
All the objects in one collection have the same description, however
class B is not able to provide a description.
How can I do this?
TIA
Michel.
21 Mar
21 Mar
6:33 p.m.
The description of the objects in class B needs to be
instance
based. All the objects in one collection have the same description,
however class B is not able to provide a description.
You can override #description on the instance side to either build
your descriptions on the fly or to modify the ones returned by the
class. For example:
B>>description
^ super description collect: [ :each |
(each isKindOf: MAToManyDescription)
ifTrue: [ each copy classes: self dynamicClasses ]
ifFalse: [ each ] ]
You find many other possible solutions in the mailing-list archive and
some additional information in the FAQ:
http://www.lukas-renggli.ch/smalltalk/magritte/faq
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
25 Mar
25 Mar
10:20 a.m.
Yes, I knew about #description on the instance side, but my question was
not precise enough. I wanted an on-the-fly description for the
collection so that the MAReport is dynamically configured.
I finally got the desired behavior simply by subclassing
MAOneToManyComponent and re-implementing #reference. This also gave me
the possibility to offer a UI on the description for hiding/showing
columns in the report. Magritte is really cool.
Thanks,
Michel.
-----Original Message-----
From: smallwiki-bounces(a)iam.unibe.ch
[mailto:smallwiki-bounces@iam.unibe.ch] On Behalf Of Lukas Renggli
Sent: vendredi, 21. mars 2008 18:33
To: Magritte, Pier and Related Tools ...
Subject: Re: Instance based description in Magritte
The description of the objects in class B needs
to be
instance based.
All the objects in one collection have the same
description, however
class B is not able to provide a description.
You can override #description on the instance side to either
build your descriptions on the fly or to modify the ones
returned by the class. For example:
B>>description
^ super description collect: [ :each |
(each isKindOf: MAToManyDescription)
ifTrue: [ each copy classes: self dynamicClasses ]
ifFalse: [ each ] ]
You find many other possible solutions in the mailing-list
archive and some additional information in the FAQ:
http://www.lukas-renggli.ch/smalltalk/magritte/faq
Lukas
--
Lukas Renggli
http://www.lukas-renggli.ch
_______________________________________________
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2 comments
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participants (2)
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Bany, Michel -
Lukas Renggli