[news.eclipse.platform] Re: A question about model-control-view.

[Tom Schindl <tom.schindl@xxxxxxxxxxxxxxx>]

Jacek Pospychala schrieb:
> Michael wrote:
> > Hi,
> >     If we contribute an action to popup menu using the extension 
> > point: org.eclipse.ui.popupMenus, we can define an objectContribution. 
> > Then, the Eclipse know how to configure the popup menu based on type 
> > of object that is a model of the right-clicked UI elment.  What I am 
> > wandering is how Eclipse know the mapping from the chosed UI element 
> > to the underlying model of this object. I really don't know what part 
> > eclipse API handle this mechinism. Do you have any idea about this?
> >      Thanks.
> > Best regards.
> > Michael.   
>
> Hello Michael,
> have a look at how selection service works in Eclipse:
> http://www.eclipse.org/articles/Article-WorkbenchSelections/article.html
>
> It's basically that, when you'd like your view to support e.g. 
> objectContribution, you first have to make it a selection provider. In 
> other words, when user selects an element in your view, you notify the 
> rest of Eclipse that new object is selected.
> Then everyone, who's interested (e.g. context menu manger, or properties 
> view), updates it's contents. You can also listen to such selection 
> notifications by making your class implement ISelectionListener and 
> registering it appropriately.

The internal service handling this is IMenuService. When registering the 
context menu-manager you'll also pass the SelectionProvider and before 
the menu-popups it is querying this provider (this is very highlevel 
description of course :-).

Tom

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Tom Schindl                                          JFace-Committer
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