Eclipse Community Forums: TMF (Xtext) » Label Provider not being invoked

Home » Modeling » TMF (Xtext) » Label Provider not being invoked

Label Provider not being invoked [message #1844535]

Thu, 16 September 2021 03:06

Eclipse User

I customised the label provider for my DSL, but in the outline tree I don't get the labels I customised. While debugging, my custom methods never get called.

During debugging, I noticed that when creating nodes,

OutlineTreeProvicer#_text

, my custom label provider is an instance of IStyledLabelProvider, so instead of invoking the

ILabelProvider#getText

methods, it calls

IStyledLabelProvider#getStyledText

that does not call the custom getText methods.

Is this the intended behaviour? How can I get the styled label provider to use the custom getText methods? I see doGetText called, but not the getText ones.

Re: Label Provider not being invoked [message #1844537 is a reply to message #1844535]

Thu, 16 September 2021 03:46

Eclipse User

can you provide a stacktace?

see also org.eclipse.xtext.ui.editor.outline.impl.DefaultOutlineTreeProvider._text(Object)
and similar places

[Updated on: Thu, 16 September 2021 04:08] by Moderator

Re: Label Provider not being invoked [message #1844543 is a reply to message #1844537]

Thu, 16 September 2021 06:51

Eclipse User

Thanks for the reply.
There is no exception, just the labels I defined not being used.

The org.eclipse.xtext.ui.editor.outline.impl.DefaultOutlineTreeProvider._text(Object) is the method I am looking at.

Is there some additional binding I need to do in the UI Module or else where? I think what I am missing is the part that does the dynamic dispatch to the specific text(XXX ele) for the ele's class.

Re: Label Provider not being invoked [message #1844544 is a reply to message #1844543]

Thu, 16 September 2021 07:17

Eclipse User

i still cannot follow you. is _text(Object called or not
and what is your expectation. this code calls into your label provider, doesnt it?
so what is not working?

Re: Label Provider not being invoked [message #1844548 is a reply to message #1844544]

Thu, 16 September 2021 08:01

Eclipse User

_text(Object) is called.

What is not working is that that method does not in turn call the String text(<Rule> ele) methods (I understood you gave to implement the text(<Rule> ele) method for each node that you want to customise)

Re: Label Provider not being invoked [message #1844550 is a reply to message #1844548]

Thu, 16 September 2021 09:13

Eclipse User

of course it does not as it calls

MyDslLabelProvider.text(Greeting) line: 27	
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]	
NativeMethodAccessorImpl.invoke(Object, Object[]) line: 62	
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43	
Method.invoke(Object, Object...) line: 566	
PolymorphicDispatcher<RT>.invoke(Object...) line: 303	
MyDslLabelProvider(DeclarativeLabelProvider).doGetText(Object) line: 52	
MyDslLabelProvider(DefaultEObjectLabelProvider).doGetText(Object) line: 36	
MyDslLabelProvider(AbstractLabelProvider).getStyledText(Object) line: 122	
MyDslOutlineTreeProvider(DefaultOutlineTreeProvider)._text(Object) line: 276

why does the reflection in doGetText not work for you?

Re: Label Provider not being invoked [message #1844562 is a reply to message #1844550]

Thu, 16 September 2021 10:43

Eclipse User

That is what I am trying to figure out! hehe.

MyDslLabelProvider.text(Greeting) line: 27

never gets called.
The line called in MyDslLabelProvider is line 72, Object text(Object element), so its like the runtime dispatch is not working for some reason

Re: Label Provider not being invoked [message #1844563 is a reply to message #1844562]

Thu, 16 September 2021 10:45

Eclipse User

then you need to debug the polymorphic dispatcher. sure you expanded the outline?

Re: Label Provider not being invoked [message #1844585 is a reply to message #1844563]

Fri, 17 September 2021 02:43

Eclipse User

Hi,

It somehow resolved it self. I think it was linked to an imported metamodel not being found at runtime (i.e. EPackage not registered exception). Perhaps the label provider logic catches the exception and just returns null.

Previous Topic:	Unable to create Eclipse Product from the sample MyDsl projects
Next Topic:	Implicit Model Elements

Goto Forum:

-=] Back to Top [=-

Current Time: Tue Apr 22 16:50:02 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter