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AddFeature in Palette [message #851968]

Sat, 21 April 2012 10:20

Eclipse User

Hi,

I am new to Graphiti and the entire Eclipse Plugin development system. Over the last week I have managed to follow tutorials and create a simple Graphiti Editor using non EMF domain model.

I have lots of questions in my mind, one of them being:

Is there a way to create a palette entry that only adds pictogram elements for existing model objects?

My use-case is that model objects will be created programmatically; the user should not be allowed to create them. The user can however add them to the diagram and change some attributes.

In the GFPaletteRoot class, I found that the PaletteEntries are added only if they are an instance of ICreationToolEntry, IStackToolEntry or IPaletteSeparatorEntry. So my hunch is that adding existing objects is not supported currently.

Assuming that is true:

* Can I (mis) use a create feature to return existing model objects (without actually creating a new object)?
* Is there a better approach to what I am trying to do?

thanks,
Harshad

Re: AddFeature in Palette [message #853617 is a reply to message #851968]

Mon, 23 April 2012 03:17

Eclipse User

Hi Harshad,

you can/should use the create feature for your purpose. It is a valid approach to return an existing model object.

We also have an example (sketch) where we have create features which create only the graphical representation (pictogram model) and they simply return the main pictogram element.

BR,
Matthias

Re: AddFeature in Palette [message #854167 is a reply to message #853617]

Mon, 23 April 2012 14:26

Eclipse User

Thanks Matthias, I was able to use a create feature with existing model objects.

Another question:
Does Graphiti have a way to add size and position constraints to containers and their children? I searched for "graphiti layout" but that returns results for layouting the whole graph. What I am interested in is something like HTML+CSS kind of layouting. For example, if a container has ten children, with different widths, the container should automatically get the width equal to the maximum width of its children.

It seems to me that GEF and Draw2D support such layouting, but I am not familiar with them to know for sure.

Regardless, does Graphiti support something like this? Or we have to manually code it?

cheers,
Harshad

Re: AddFeature in Palette [message #854202 is a reply to message #854167]

Mon, 23 April 2012 15:17

Eclipse User

Answering my own question:

Further searching revealed this feature request:
Bug #352097 : Better support for layout - provide standard layouts (Can't post links since I am new to forum)

So looks like it isn't supported right now.

Re: AddFeature in Palette [message #854722 is a reply to message #854202]

Tue, 24 April 2012 03:33

Eclipse User

Right, currently you will have to implement it yourself. It would be great
if you could post your findings/issues/needs on this in that bug.

Thanks,
Michael

Re: AddFeature in Palette [message #857072 is a reply to message #854722]

Thu, 26 April 2012 04:12

Eclipse User

I have a similar use case:
I would like to drop an existing Business Object (e.g., from a jface viewer using DND) onto the graphiti editor.

Graphiti should be able to handle objects not created by the tool palette, but instead call the AddFeature to create the pictogram element...
Does that sound reasonable/doable?

Re: AddFeature in Palette [message #857348 is a reply to message #857072]

Thu, 26 April 2012 09:19

Eclipse User

That's possible today. See the tutorial: you can add EClasses created in
other diagrams from the project explorer to a diagram simply by drag&drop.
In that case the AddFeature is called.

Michael

Re: AddFeature in Palette [message #1060533 is a reply to message #851968]

Sun, 26 May 2013 06:53

Eclipse User

I implemented a Feature like this, by using the tutorial Code, and call an existing AddFeature.

But eclipse always throws an "IllegalStateException: Cannot modify resource set without write transaction" at the link(shape,addedClass) command.

Any ideas why?

Re: AddFeature in Palette [message #1060692 is a reply to message #1060533]

Mon, 27 May 2013 17:20

Eclipse User

OK i found the problem. I used the wring transactionalEditingDomain.
But now only stuff like this is added to the diagram file:
<pictogramLinks href="#//@link"/>
<pictogramLinks href="#//@children.0/@children.1/@link"/>
<pictogramLinks href="#//@children.0/@children.2/@link"/>

There is no graphical representation?

Re: AddFeature in Palette [message #1060770 is a reply to message #1060692]

Tue, 28 May 2013 07:51

Eclipse User

Maybe you don't add the stuff to the resource?

Michael

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