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Conditional style in tree description [message #1805151]

Mon, 08 April 2019 09:32

Eclipse User

Hello,

I am trying to create a new tree view based on sirius tree description.
So far I have successfully been able to define the content of the tree, and to define some drag & drop tools.

However, I do not achieve to apply conditional style on the tree.

I have declared a conditional style under a tree element.
In order to know if the conditional style has to be applied, I need to get the DTreeItem in order to know where the semantic element is represented in the tree.

The predicate expression I use is: "<% $view.isMissingFromInterfaces() %>" and I have defined the associated Java function:
public boolean isMissingFromInterfaces (DTreeItem item) { ... }

The result is that my Java function is never called...
It seems like the variable "view" is use is not recognized.

Any idea?

Re: Conditional style in tree description [message #1805170 is a reply to message #1805151]

Tue, 09 April 2019 04:01

Eclipse User

Hello,

Have you tried "var:" with ctrl+space for auto-completion to see available variables? The var interpreter is an optimized interpreter for quick access to variable. The view variable should be available for in predicate expression.
I see that you use an Acceleo2 expression (query legacy). Have you tried with an AQL expression?

Regards,

Florian

Re: Conditional style in tree description [message #1805172 is a reply to message #1805170]

Tue, 09 April 2019 04:44

Eclipse User

Hello Florian,

Thank you for your quick answer.
I am not familiar with AQL expression. Could you help me translate my expression in AQL ?

BTW, when using var + auto-completion, the variable "view" is indeed listed...

Re: Conditional style in tree description [message #1805174 is a reply to message #1805172]

Tue, 09 April 2019 05:16

Eclipse User

Moreover, when I check the variables available from the field "Label Expression" of the style itself, I have:
- self
- diagram: [diagram.DSemanticDiagram]
- view: [diagram.DDiagramElement]
(either from info help or from auto-completion)

Isn't there an issue in the definition of the variables?
I am defining a tree and not a diagram!

Re: Conditional style in tree description [message #1805176 is a reply to message #1805174]

Tue, 09 April 2019 05:32

Eclipse User

About the label expression, that sounds as a bug. The problem could be a wrong auto-completion documentation. In that case, it would be interesting to see with a Java service the real type of the "view" variable for instance.

About AQL expression, you can define them by using the aql: interpreter. Your expression will be "aql:view.isMissingFromInterfaces()".
You can find documentation about AQL expressions in this page[1] and a detailed documentation here[2].

Regards,
Florian

[1] https://www.eclipse.org/sirius/doc/specifier/general/Writing_Queries.html#aql
[2] https://www.eclipse.org/acceleo/documentation/aql.html

Re: Conditional style in tree description [message #1805177 is a reply to message #1805176]

Tue, 09 April 2019 05:40

Eclipse User

I have tried the aql expression. The result is the same (the java service is not called).

How could I check if there is an error in the definition of the auto-completion documentation?
How to use this Java service you are talking about?

Re: Conditional style in tree description [message #1805224 is a reply to message #1805177]

Wed, 10 April 2019 04:59

Eclipse User

I have done a debug session and the only available variable is "self" (so the semantic element in that case). The "view" is available in the context of a diagramDescription but not in a treeDescription. That's a bug. Do not hesitate to raise a bugzilla about this issue[1]
About your initial need, conditional style are designed to be applied on the semantic model but not really to depend on the graphical state.

Regards,
Florian

[1] https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Sirius

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