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How do I change color in programmatic way [message #859692]

Fri, 27 April 2012 15:15

Johnny Qin
Messages: 40
Registered: April 2012

Member

Hi there,

I created my ChangeStateColorFeature which extends AbstractCustomFeature, registered it in feature provider. It all works well.

Right now I am trying to change color of state (a rectangle in diagram) in programmatic way, in other words, change its color without clicking any button. Firstly I was trying to get access to the context object which seems to have control of everything. Later I thought there should be some event system going on. Neither worked for me.

Could anyone give a brief idea of how to achieve this? Thanks in advance.

Sincerely,
Johnny

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Re: How do I change color in programmatic way [message #865073 is a reply to message #859692]

Mon, 30 April 2012 04:06

Michael Wenz
Messages: 1268
Registered: July 2009
Location: Walldorf, Germany

Senior Member

You should be able to use the CustomFeature you have build and construct an
CustomContext holding the information you need in your feature. The piece
you will have to build still is how the feature gets triggered. Graphiti
always uses a user interaction to start any functionality, but you might
e.g. use a thread that triggers the feature periodically; this could be done
e.g. by finding the diagram editor and using it's executeFeature() method (I
think available starting with 0.8) or getting the command stack from the
editing domain of the editor and executing it there.

Michael

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Re: How do I change color in programmatic way [message #865745 is a reply to message #865073]

Mon, 30 April 2012 10:49

Johnny Qin
Messages: 40
Registered: April 2012

Member

Thanks Michael.

Seems "by finding the diagram editor and using it's executeFeature() method" worth a try. I can find the diagram editor, however the question is how to get the Context object. Seems Graphiti gets context objects by tracking user interaction (e.g. mouse click).

Actually I made a little progress by loading pictogram models in ecore and updating color of certain graphical object from there. This way pictogram models do get correct update while the editor doesn't reflect the change unless reopen the file. I tried refreshContent(), refresh(), getContentEditPart().refresh() and quite a lot other ways but could not manage to refresh editor. I also tried reset editor input as well but got some thread control issue.

Any suggestions on either approach are welcomed and appreciated!

Thanks a lot.
Johnny

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Re: How do I change color in programmatic way [message #868183 is a reply to message #865745]

Tue, 01 May 2012 13:34

Johnny Qin
Messages: 40
Registered: April 2012

Member

Finally it works (I believe there must be a better way)

load pictogram model in ecore
update color in object hierarchy
save the pictogram model
// till now the diagram file is updated, the next is to update editor to present the color change visually
find the diagram editor from eclipse platform ui
find its resource
call unload() method on the pictogram model resource
// now color change is visual

what unload() does is
Clears the contents, errors, and warnings of the resource and marks it as unloaded.
It walks the content tree, and sets each content object to be a proxy. The resource will remain in the resource set,
and can be subsequently reloaded.

If anyone find a better solution, please shoot me a message. Thanks in advance!

Sincerely,
Johnny

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