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Modify the element's attribute (Att1) when the element's (Att2) changes [message #1793937]

Mon, 20 August 2018 20:33

Parsa Pourali

Messages: 210
Registered: February 2014

Senior Member

Hello,

I am trying to listen to an attribute of an element and change another attribute of that same element accordingly.

for example if the user sets the Att1 to "On Aspect Light", then I set the value of Att2 to "Green", if he set the Att1 to "Two Aspects Light", then I set the Att2 to "Green,Red", and if set the Att1 to "Three Aspects light", then I set the Att2 to "Green, Yellow, Red".

I tried to use a resource change listener, but unfortunately it throws error saying that the read adn write modifications cannot be done at the same context.

Do you know any other ways that I could use?

Thanks,
Parsa

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Re: Modify the element's attribute (Att1) when the element's (Att2) changes [message #1793938 is a reply to message #1793937]

Mon, 20 August 2018 20:53

Christian W. Damus

Messages: 1195
Registered: July 2009
Location: Canada

Senior Member

Hi, Parsa,

Sounds like you're in a TransactionalEditingDomain. What you are looking to do is one of the use cases of "trigger commands". Instead of a post-commit listener, implement a pre-commit listener that returns a Command (could be a compound) that makes the changes that you need in your objects. See the tutorial documentation in the Help for details.

HTH,

Christian

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