Eclipse Community Forums: Sirius » Moving elements to the back on creation

Help

Home

Home » Eclipse Projects » Sirius » Moving elements to the back on creation

Show: Today's Messages :: Show Polls :: Message Navigator

Moving elements to the back on creation [message #1861524]

Tue, 17 October 2023 10:45

Lukas-Angelo Meier

Messages: 8
Registered: May 2023

Junior Member

Hello,

I made a tool to create an element and now i would like these elements to always be in the back behind other elements. I can manually do this in the context menu for each element, but i would like this to be done automatically on creation.

How can i achieve this behavior?

What i found so far is "org.eclipse.sirius.diagram.tools.api.command.view.SendElementsToBack", however i am unsure if this is for edges only and how to implement it properly.

I thought of using a IExternalJavaAction, but i don't know how to get the view required by this (SendElementsToBack) class.

Any help is appreciated.

Report message to a moderator

Re: Moving elements to the back on creation [message #1861659 is a reply to message #1861524]

Wed, 25 October 2023 14:47

Pierre-Charles David

Messages: 703
Registered: July 2009

Senior Member

Hi.

You cant't do it directly inside the body of your creation tool, as you need to manipulate the order of the GMF View element for the new node, which will only exist after Sirius has refreshed the state of the diagram, which happens after your tool has executed.

You *may* be able to do it using a ModelChangeTrigger, which can perform changes in the model before a change is commited (it's a pre-commit listener in EMF Transaction parlance).
It's quite involved if you're not familiar with all the APIs involved, but some pointers:

* Ecore Tools has examples of https://github.com/eclipse-ecoretools/ecoretools/blob/master/org.eclipse.emf.ecoretools.design/plugin.xml#L24, for example https://github.com/eclipse-ecoretools/ecoretools/blob/master/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/service/AutosizeTrigger.java
* You'll need to have a SessionListener to install your ModelChangeTrigger, see https://github.com/eclipse-ecoretools/ecoretools/blob/master/org.eclipse.emf.ecoretools.design/src/org/eclipse/emf/ecoretools/design/internal/EcoreToolsSessionListener.java for an example
* The SessionListener itself needs to be registered with an extension point. See https://github.com/eclipse-ecoretools/ecoretools/blob/master/org.eclipse.emf.ecoretools.design/plugin.xml#L24.
* Assuming all of this is properly setup, your ModelChangeTrigger will need to identify changes which correspond to the invocation of your tool/creation of the new element, find the GMF Node that Sirius/GMF will have created to represent it, and use code similar to "ViewUtil.repositionChildAt(containerView, view, 0)" (found in SendElementsToBack) to move the new Node as the first of its siblings (which corresponds to placing it below all of them).

Pierre-Charles David - Obeo

Need training or professional services for Sirius?
http://www.obeodesigner.com/sirius

Report message to a moderator

Previous Topic:	Domain/Element-based edge issue
Next Topic:	How to bundle a Sirius modeler after creating the .aird

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Thu May 09 11:20:49 GMT 2024

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter