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Display Child outside ParentContainer [message #1746343] Thu, 27 October 2016 09:24 Go to next message
korbinian werner is currently offline korbinian wernerFriend
Messages: 7
Registered: August 2016
Junior Member
Hello everybody,

i'm actually facing following problem. Maybe u have already defined an SYSML model with papyrus. Espacially the Internal Block Diagram. I'm writing a GEF Editor witch contains some functions of this SYSML model. My problem is : I know how to define Containers and Childs and i can create Childs in Parents(Containers) but now i have one problem. I can't display the child outside the parent constraints. Not directly outside but consider the following: u have an System with "Ports" and u want these ports to show up directly on the constraint lines of the System. So the port is the Child of the System(parent). I can display the port completly inside the parent, but when i try to move it outside the parent, the GEF-Editor blocks my movement because its not allowed.
Maybe u have a look at the pictures below so everything gets clearer. So u can understand what i mean.

I'm thankfully for every help Smile
Greetings
Re: Display Child outside ParentContainer [message #1746359 is a reply to message #1746343] Thu, 27 October 2016 13:14 Go to previous messageGo to next message
Matthias Wienand is currently offline Matthias WienandFriend
Messages: 163
Registered: March 2015
Senior Member
Hi korbinian,

GEF 3.x Draw2D restricts the drawing area for children to the bounding box of their parent, i.e. children figures can only draw within the bounds of their parent figure.

As far as I know, you cannot change this behavior. As a workaround, you could increase the bounds of the parent figure, so that the children figures are not clipped at the bounds. I do not know the details for this, but I know that it is a common problem with GEF 3.x Draw2D, so maybe you can find examples online. Another workaround would be to remove the parent-child-relation within the edit-part hierarchy, i.e. let ports and systems have parts on the same level of the hierarchy (if feasible).

However, with the new version of GEF (Neon: GEF4 1.1.0, Oxygen: GEF 5.0.0), where the visualization is based on JavaFX, this restriction was naturally lifted as JavaFX generally allows children to draw outside their parent. So depending on the features that are needed, maybe it is worth to take a look at the current version of GEF.

Best regards,
Matthias
Re: Display Child outside ParentContainer [message #1746408 is a reply to message #1746359] Fri, 28 October 2016 11:01 Go to previous messageGo to next message
Alexander Nyssen is currently offline Alexander NyssenFriend
Messages: 235
Registered: July 2009
Location: Lünen
Senior Member
If you need to do this with GEF-Legacy, you might want to take a look at the GMF runtime. They have added support for such kind of abstractions in terms of their AbstractBorderItemEditPart.
Re: Display Child outside ParentContainer [message #1747160 is a reply to message #1746408] Thu, 10 November 2016 10:56 Go to previous messageGo to next message
korbinian werner is currently offline korbinian wernerFriend
Messages: 7
Registered: August 2016
Junior Member
Hi Alexander,

Thanks for this reply. Now i tried a lot with these Bordered items but i dont get it ... How do they work i read the documentation but there is no clue for me...
do u have a proper example for me how it is done ?
Re: Display Child outside ParentContainer [message #1747577 is a reply to message #1747160] Wed, 16 November 2016 08:16 Go to previous messageGo to next message
Vlad Buzea is currently offline Vlad BuzeaFriend
Messages: 7
Registered: August 2016
Junior Member
Hi Korbinian,

We are also developing a system with ports, using GEF4. Our solution was to set the ports as edge source and target decorations. The only problem with this solution is that you cannot have unconnected ports.
Re: Display Child outside ParentContainer [message #1747580 is a reply to message #1747577] Wed, 16 November 2016 08:45 Go to previous message
Alexander Nyssen is currently offline Alexander NyssenFriend
Messages: 235
Registered: July 2009
Location: Lünen
Senior Member
Within GEF4 there is no limitation that children are rendered outside their parents. Things would be easy there.

In GEF 3.x we have such a restriction (within Draw2d). You could work around it on the figure side by overwriting IFigure#getChildren() and remove the clipping there, but you really need to know what you are doing, as updating of dirty regions and repainting then has to be handled in your code as well. I pointed to GMF runtime because they have added respective concepts in their MVC abstractions already. That is probably the better place to start.
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