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Undo History [message #699376]

Thu, 21 July 2011 13:10

Rhett Hudson

Messages: 43
Registered: September 2010

Member

I have some questions about undo. I was hoping someone could point me down the appropriate path. My observations of undo behavior show:

Undo can remember 20 commands
Undo looses all history on save

Are those characteristics something that Graphiti is implementing? Or are they at a different layer. If they are in the Graphiti layer, can someone point to where in thee code they are implemented? My grep attempts have not yet yielded any useful hits. Also, if appropriate, perhaps someone would like to warn me of the consequences of meddling with that?

Thanks!

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Re: Undo History [message #699797 is a reply to message #699376]

Fri, 22 July 2011 10:19

Michael Wenz

Messages: 1931
Registered: July 2009
Location: Walldorf, Germany

Senior Member

The stack size of 20 is defined by Eclipse
(org.eclipse.core.commands.operations.DefaultOperationHistory#DEFAULT_LIMIT.
The flushing of the command stack is done by Graphiti
(org.eclipse.graphiti.ui.internal.services.impl.EmfService#save, Line 269).
It was introduced because there were issues with undo after a save was done.
Unfotunatly I cannot recall the details just now...

Michael

"Rhett Hudson" schrieb im Newsbeitrag news:j097su$2c7$1@news.eclipse.org...

I have some questions about undo. I was hoping someone could point me down
the appropriate path. My observations of undo behavior show:

Undo can remember 20 commands
Undo looses all history on save

Are those characteristics something that Graphiti is implementing? Or are
they at a different layer. If they are in the Graphiti layer, can someone
point to where in thee code they are implemented? My grep attempts have not
yet yielded any useful hits. Also, if appropriate, perhaps someone would
like to warn me of the consequences of meddling with that?

Thanks!

Report message to a moderator

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