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Home » Modeling » GMF (Graphical Modeling Framework) » Reverse the link direction of a reference based link
Reverse the link direction of a reference based link [message #212404] Fri, 28 November 2008 16:35 Go to next message
Joerg Selig is currently offline Joerg SeligFriend
Messages: 11
Registered: July 2009
Junior Member
Hello,

i follow the approach described in the post: 'How to generate a link
with multiple sources and targets'. The 'from' and 'to' links are
reference-based LinkMappings.

I would like to know how i can reverse the link direction of the 'from'
link. In general we need a left to right direction for all links.



Joerg

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Re: Reverse the link direction of a reference based link [message #212501 is a reply to message #212404] Mon, 01 December 2008 07:22 Go to previous messageGo to next message
Joerg Selig is currently offline Joerg SeligFriend
Messages: 11
Registered: July 2009
Junior Member
Problem solved. The solution was found in the GMF genmodel. Under 'Gen
Editor/Gen Diagram/Gen Link ???EditPart' exists two properties,
'Incomming Creation Allowed' and 'Outgoing Creation Allowed', who
control the behavior i want.


Joerg

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Re: Reverse the link direction of a reference based link [message #212524 is a reply to message #212404] Mon, 01 December 2008 09:54 Go to previous messageGo to next message
Alexander Shatalin is currently offline Alexander ShatalinFriend
Messages: 2928
Registered: July 2009
Senior Member
Hello joerg,

There are three properties of GenLink in .gmfgen model:
- incomingCreationAllowed
- outgoingCreationAllowed
- viewDirectionAlignedWithModel

Additional command "reverting" the link will be generated if you specify
incomingCreationAllowed = true, outgoingCreationAllowed = false, viewDirectionAlignedWithModel
= true.

So you can try this and use generated code as an example of changing the
visual link direction on a creation time.

-----------------
Alex Shatalin

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Re: Reverse the link direction of a reference based link [message #212641 is a reply to message #212524] Wed, 03 December 2008 13:54 Go to previous messageGo to next message
Joerg Selig is currently offline Joerg SeligFriend
Messages: 11
Registered: July 2009
Junior Member
Hello Alex,

thanks for your reply. On creation time it works. But when i save, close
and re-open the editor the 'from link' shows from the 'link center' node
towards nowhere. This is caused, since the 'from link' EditPart was
added to the 'link center' EditPart as a 'source connection' instead of
a 'target connection'.

Can i change this behaviour? Maybe by change the ??diagramUpdater class
or exists better places for make any necessary adjustments.


Thanks
Joerg

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Re: Reverse the link direction of a reference based link [message #212649 is a reply to message #212641] Wed, 03 December 2008 16:15 Go to previous messageGo to next message
Alexander Shatalin is currently offline Alexander ShatalinFriend
Messages: 2928
Registered: July 2009
Senior Member
Hello joerg,

It looks like a probelem of diagram update logic working in viewDirectionAlignedWithModel
= false conditions... Yes, you can modify ??diagramUpdater to handle this
situation properly.
BTW, if you just need to create link from node1 to node2, but show it with
an arrow pointing to node1 then you can use source decoration instead of
target in .gfmgen model and visually link will point to node1 (staying alighed
with model link in notation model..)

-----------------
Alex Shatalin

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Re: Reverse the link direction of a reference based link [message #212788 is a reply to message #212649] Thu, 04 December 2008 13:27 Go to previous messageGo to next message
Joerg Selig is currently offline Joerg SeligFriend
Messages: 11
Registered: July 2009
Junior Member
Hello Alex,

thanks for your reply. Modify the ??DiagramUpdater was the
straight tip. I got the desired behaviour.

Thanks
Joerg

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Re: Reverse the link direction of a reference based link [message #212803 is a reply to message #212788] Thu, 04 December 2008 13:40 Go to previous messageGo to next message
Alexander Shatalin is currently offline Alexander ShatalinFriend
Messages: 2928
Registered: July 2009
Senior Member
Hello joerg,

Can you please file a bugzilla issue describing this situation then?

-----------------
Alex Shatalin

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Re: Reverse the link direction of a reference based link [message #212847 is a reply to message #212803] Fri, 05 December 2008 10:19 Go to previous message
Joerg Selig is currently offline Joerg SeligFriend
Messages: 11
Registered: July 2009
Junior Member
Hello Alex,

> Can you please file a bugzilla issue describing this situation then?

Sure.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=257688


Thanks for your help
Joerg

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