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Enable/disable commands on the basis of a view's content [message #756124]

Fri, 11 November 2011 06:03

Elvie DSouza

Messages: 5
Registered: September 2010

Junior Member

Hi,

I have a menu with commands based menuitems. I have created a source provider by extending AbstractSourceProvider class to enable/disable the commands.

I am enabling them by setting the state of the variable as 'enabled' when I add a particular file to a custom view (created in the base product, we don't have the source code for it).

The view has a context menu in which there is a delete action to delete the contents.

My problem is that I am not able to detect the delete of the files, which in turn keeps the menuitems/commands in enabled state even if the file is not present in the view.

The workaround for this is to add a 'Show' listener to the top menu & set the variable as enabled/disabled. But there are different source providers for different file types. It's becoming cumbersome to use this approach.

I want to know a way in which I can detect the delete in the view and set my variables accordingly.

Pls help.

Thanks
Elvie

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Re: Enable/disable commands on the basis of a view's content [message #756529 is a reply to message #756124]

Mon, 14 November 2011 08:43

saurav sarkar

Messages: 428
Registered: July 2009

Senior Member

Hi Elvie,

Your view should act as a listener to the model on which you are working.So any modification in the model should send notification to the view.
The view then should change it accordingly.EMF has a very nice way of implementing the same behaviour through its notification mechanism for its models.

cheers,
Saurav

My Blog http://codifyit.blogspot.com/
Follow me: http://twitter.com/sauravs

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