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Problem when writing add constraint [message #897477]

Tue, 24 July 2012 09:07

Maxime D

Messages: 27
Registered: June 2012

Junior Member

I'm currently writing my own Graphiti editor on top of my EMF model which comes from Xtext.
I'm following the documentation founded in Eclipse Help but I have a question.

I have 2 forms from now, a rectangle and a shape.
I would like to say to Graphiti "You can create a shape in a rectangle and only in a rectangle, not in the diagram."

So I'm trying something like this in AddObjectAFeature.java :

@Override
public boolean canAdd(IAddContext context) {	
if (context.getNewObject() instanceof ObjectA) {
  if (context.getTargetContainer().getXXXXX() instanceof ObjectB) {
     return true;
  }
}
return false;
}

ObjectA is the business object represented by the shape and the ObjectB is represented by the rectangle.

My problem is, I can't access to my instance of ObjectB through "context.getTargetContainer(). etc...".

Any help would be appreciated, thanks Smile

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Re: Problem when writing add constraint [message #897527 is a reply to message #897477]

Tue, 24 July 2012 12:19

Maxime D

Messages: 27
Registered: June 2012

Junior Member

Ok I found the solution, I guess Wink

if(getBusinessObjectForPictogramElement(context.getTargetContainer()) instanceof ObjectA){
...
}

Sometimes you just need to write your problem Wink

[Updated on: Tue, 24 July 2012 12:19]

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Re: Problem when writing add constraint [message #897539 is a reply to message #897527]

Tue, 24 July 2012 12:52

Matthias Gorning

Messages: 81
Registered: April 2010
Location: Germany

Member

Yes, that is the correct method to get the business object which is linked to the pictogram element.

If you don't want allow the creation of new elements directly in the diagram, you can simply add this to your canAdd() method:

if (context.getTargetContainer() instanceof Diagram){
   return false;
}

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Re: Problem when writing add constraint [message #897570 is a reply to message #897539]

Tue, 24 July 2012 14:25

Maxime D

Messages: 27
Registered: June 2012

Junior Member

Thank you for the int Wink

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