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| Re: How can I dynamically add child to parent objects. [message #145804 is a reply to message #145785] |
Sat, 31 July 2004 10:09  |
Eclipse User |
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Originally posted by: rlemaigr.ulb.ac.be
> Please anyone give me some good reference for adding child objects=
to
> parent objects dynamically
Hi,
If you want examples, the HelloGef Examples are very useful:
http://eclipse-wiki.info/GefExamples
If you want an explanation attempt, here it is:
You have a parent model object and its children (I call "children" here =
=
the objects
you want to be represented inside of the parent representation, I don't =
=
know about the official
definition of that).
- When you add a child model object to its parent model object, the pare=
nt =
should notify
this event to its listeners. You have to implement yourself this =
notification mecanism in your model,
maybe with the java.beans.* classes.
- The parent EditPart (the EditPart of the parent model object) must be =
=
listening for these events.
You add it as a listener of its model object by overriding its activate(=
) =
method and calling smthg like
((ParentModelClass)getModel()).addListener(this).
- When the parent EditPart receives such an event, in the =
propertyChange(d?) method you must call
this.refreshChildren() (if you don't mind about efficiency). The =
refreshChildren() method will call
getModelChildren(), a method you should already have implemented in the =
=
parent EditPart that
should be returning the list of model objects that must be represented i=
n =
its content pane. With this information,
the parent EditPart will update the list of children EditParts / Figures=
=
according to the getModelChildren List.
- to create new EditParts for the children model object, the parent =
EditPart will call createChild(Object model),
which delegate the job to the EditPartFactory of the EditPartViewer (you=
=
should already have implemented that
if your model is displayed).
I think that's all you have to know...
bye
r=E9gis
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