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RCP e4 undo - redo [message #1446269]

Thu, 16 October 2014 15:49

Thomas Elskens

Messages: 159
Registered: September 2014
Location: Brussels - Belgium

Senior Member

Hello,

I wondered I've there were any examples on how to implement undo - redo functionality in an RCP - application. On the web I've found lots of references to eclipse 3, but very little for e4.

In the eclipse docs, I find some explanations in the package org.eclipse.core.commands.operations, but I really don't see how I can put this together with declarative commands and handlers?

Any tutorial or source code example available for this... ?

Thanks a lot,

Thomas Elskens

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Re: RCP e4 undo - redo [message #1448617 is a reply to message #1446269]

Mon, 20 October 2014 07:27

Thomas Schindl

Messages: 6651
Registered: July 2009

Senior Member

Hi,

The question is in what context you want to do undo/redo. E.g. in our
applications most undo/redo is coming from EMF hence we don't even need
to the core.commands support for it.

In my understanding undo/redo concept is fairly easy to accomplish:
a) you have a Stack of Commands
b) A command is a duple of the command and its reverse operation

Tom

On 16.10.14 17:49, Thomas Elskens wrote:
> Hello,
>
> I wondered I've there were any examples on how to implement undo - redo
> functionality in an RCP - application. On the web I've found lots of
> references to eclipse 3, but very little for e4.
> In the eclipse docs, I find some explanations in the package
> org.eclipse.core.commands.operations, but I really don't see how I can
> put this together with declarative commands and handlers?
> Any tutorial or source code example available for this... ?
>
> Thanks a lot,
>
> Thomas Elskens

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Re: RCP e4 undo - redo [message #1448757 is a reply to message #1448617]

Mon, 20 October 2014 11:55

Thomas Elskens

Messages: 159
Registered: September 2014
Location: Brussels - Belgium

Senior Member

Err, does this mean I'd rather implement undo-redo myself and not use commands.operations?

I agree it's not difficult, but as RCP-Commands are great in unifying keybindings-menuitems-UI-buttons action handling, I was wondering if I couldn't "append" undo/redo to them with a e4 productivity-tool?

As for defining my business model in EMF, it's on the list of things I would like to test, but I'm new to all Eclipse products and I would like to proceed step by step.

Thomas

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