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

["Michael" <my25@xxxxxxxxxxxxx>]

Hi,
    Both replies from you make me very clear about it.
    Thank you, both.
Best regards
Michael.
"Tom Schindl" <tom.schindl@xxxxxxxxxxxxxxx> wrote in message 
news:fn08g8$3dr$1@xxxxxxxxxxxxxxxxxxxx
> 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
>
> -- 
> B e s t S o l u t i o n . at
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> Tom Schindl                                          JFace-Committer
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