| Approach for Attaching/Detaching Listeners [message #1229179] |
Wed, 08 January 2014 21:57  |
 Andreas Weise
Messages: 37
Registered: January 2014 |
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I have a model containing an Element 'Captions', that I want to reuse on several other Elements in the model (using interface inheritance).
The captions element contains a ListPropery 'FooListProperty' that needs to be modified upon value change of a ValueProperty 'RootElement/BarValueProperty', which exists on the root of the model.
I therefore want to create a FilteredListener for each instance of the 'Captions' element or 'FooListProperty' property, that is in charge for making the changes. That listener should be attached on 'RootElement/BarValueProperty'. But I'm stuck on from which place I could create and attach/detach this listener.
I've tried the Service approach but could not get it running:
1. Service, that registers Listener within init(). Created a CustomService extends Service, added it to META-INF sapphire-extension.xml, annotated it on FooListProperty with @Service > but init() method is never invoked!
2. like 1. + including a Condition Class, that was also added to sapphire-extension.xml > applicable() method is never invoked!
What's required to get the init() method invoked of a CustomService that extends org.eclipse.sapphire.services.Service ?
Or could you please advice whats the easiest approach for attaching/detaching a simple listener on a field. I also did not find a suitable example in the samples project.
Thanks for your answer.
Andreas
[Updated on: Wed, 08 January 2014 21:59] Report message to a moderator |
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| Re: Approach for Attaching/Detaching Listeners [message #1229338 is a reply to message #1229203] |
Thu, 09 January 2014 08:34  |
Andreas Weise
Messages: 37
Registered: January 2014 |
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Yeah an inversion of the attempt would work but requires more maintenance of the listener, as there are couple of captions throughout the model.
But I've now found an approach for my initial idea by creating a CustomXmlListBinding that extends StandardXmlListBindingImpl and adding it on the ListProperty of the reusable element. init()/dispose() methods of this binding are suitable for handling the listeners lifecycle.
One remaining questions regarding the custom service approach is where I would typically request such a custom service from?
[Updated on: Thu, 09 January 2014 08:34] Report message to a moderator |
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