Eclipse Community Forums: EMF » Combining EMF Commands and Text Editor operations

Home » Modeling » EMF » Combining EMF Commands and Text Editor operations

Combining EMF Commands and Text Editor operations [message #1075319]

Mon, 29 July 2013 04:20

Eclipse User

Hi,

I have a multi page editor . One tab has a model and another one has a corresponding source
I trigger an EMF AddCommand (A1) in the model editor followed by a text operation (T1) (Initiated by the text editor editor framework).

Then I have number of set commands (S1...S3) depending upon some condition. (for e.g. on page change)

Like this A1->T1->S1->S2->S3

Now I would like to have undo/redo for a transaction shown as the sequence above. How this can this be achieved in a better way. Both text operation and EMF model commands have to work seamlessly.

The framework must revert in the above order starting from S3.

Do I have to put all the commands in the Compound Command. In that case how can I achieve the text operation synchronization ?.

Cheers,
Saurav

Re: Combining EMF Commands and Text Editor operations [message #1075332 is a reply to message #1075319]

Mon, 29 July 2013 04:54

Eclipse User

Saurav,

Comments below.

On 29/07/2013 10:20 AM, saurav sarkar wrote:
> Hi,
>
> I have a multi page editor . One tab has a model and another one has a
> corresponding source
> I trigger an EMF AddCommand (A1) in the model editor followed by a
> text operation (T1) (Initiated by the text editor editor framework).
> Then I have number of set commands (S1...S3) depending upon some
> condition. (for e.g. on page change)
>
> Like this A1->T1->S1->S2->S3
>
> Now I would like to have undo/redo for a transaction shown as the
> sequence above. How this can this be achieved in a better way. Both
> text operation and EMF model commands have to work seamlessly.
I've never looked at solving that problem. Each has their own command
stack but you need for there to be one command stack.
>
> The framework must revert in the above order starting from S3.
>
> Do I have to put all the commands in the Compound Command.
Each separately undoable thing needs to be part of a single command in
EMF's command stack.
> In that case how can I achieve the text operation synchronization ?.
Perhaps you should try to use EMF's command stack with commands to
encapsulate the text actions so that an undo on that command will undo
the text action or call the text editor's command stack to undo it. As
I said, I've never looked into how to solve such a problem...
>
> Cheers,
> Saurav
>

Re: Combining EMF Commands and Text Editor operations [message #1075529 is a reply to message #1075319]

Mon, 29 July 2013 11:31

Eclipse User

Thanks for the comments Ed.

I could achieve the same by using Compound Command and overriding the doUndo() method to undo the text editor stack changes.

Just a curiosity on what would EMFCompositeOperation and NonEMFTransaction in org.eclipse.emf.workspace plugin are used for ?any sample implementation done on those ?

cheers,
Saurav

Re: Combining EMF Commands and Text Editor operations [message #1075531 is a reply to message #1075529]

Mon, 29 July 2013 11:36

Eclipse User

Saurav,

Comments below.

On 29/07/2013 5:31 PM, saurav sarkar wrote:
> Thanks for the comments Ed.
>
> I could achieve the same by using Compound Command and overriding the
> doUndo() method to undo the text editor stack changes.
Yes. I'm not sure how you're doing the text change itself right now,
but it should be part of the doExecute and then you reverse the effect
in doUndo...
>
> Just a curiosity on what would EMFCompositeOperation and
> NonEMFTransaction in org.eclipse.emf.workspace plugin are used for ?
I can't really comment on the transaction framework because I have
pretty much no experience with that. Maybe someone else will answer...
> any sample implementation done on those ?
>
> cheers,
> Saurav

Re: Combining EMF Commands and Text Editor operations [message #1075548 is a reply to message #1075531]

Mon, 29 July 2013 12:11

Eclipse User

Yes i forgot to mention about the actual text change.
Its done as you mentioned.

cheers,
Saurav

Re: Combining EMF Commands and Text Editor operations [message #1075628 is a reply to message #1075529]

Mon, 29 July 2013 15:29

Eclipse User

Hi, Saurav,

EMFCompositeOperation is an IUndoableOperation (as defined by the
Eclipse Operation History API) that aggregates multiple discrete
operations on EMF models/editing-domains. It is analogous to the
CompoundCommand in EMF.Edit.

The NonEMFTransaction is intended to encapsulate undoable state changes
in stuff that is not EMF model content, to embed it in an EMF
transaction's change description for undo/redo. Updates to the state
of UI components is an example of what this is intended to capture.

As far as I recall (it has been several years, now) the
NonEMFTransaction is supposed only to be used internally by the
TransactionalEditingDomain, but I could be wrong. I don't there is
public API for creating and manipulating these transactions ... A
search of the code would answer that for you.

HTH,

Christian

On 2013-07-29 15:31:29 +0000, saurav sarkar said:

> Thanks for the comments Ed.
>
> I could achieve the same by using Compound Command and overriding the
> doUndo() method to undo the text editor stack changes.
>
> Just a curiosity on what would EMFCompositeOperation and
> NonEMFTransaction in org.eclipse.emf.workspace plugin are used for ?any
> sample implementation done on those ?
>
> cheers,
> Saurav

Previous Topic:	Regenerating Ecore from XSD
Next Topic:	where could I get map file of EMF?

Goto Forum:

-=] Back to Top [=-

Current Time: Thu Jul 17 05:38:24 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter