Is Possible to roll back variable within undo command , outside of transaction?

[JanetDavidson]

Hi,

I need to be able to roll back my variables if user apply an UNDO. I am just wondering if this is possible and what is your trick in this regard. Let's say.

Myinteger =1

Startstransaction

........

trans commint

Myinteger=2

Startstransaction

........

trans commint

Myinteger=3

if user does undo 2 times  the Variable  Myinteger  keep the value  3 . I want it back to 1. How?

Thanks for any help or workaround or trick.

Janet.

[Alfred.NESWADBA]

Hi,

my understanding is one undo makes one (main) transaction-part undone. With main-transaction I mean the "master" transaction without looking to any nested transactions.

If you want to undo more than one actions with one step you can set undo-markers.

- alfred -

[JanetDavidson]

Hello Alfred,

Thanks for your time looking into my question. 

My concern is  the public shared variable in whole project  ( in this simple sample, say , "myinteger".

When I  undo a  command that variable doesn't roll back ot initial value . 

Hope I explained or you need a asimple example code?

Regards,

Janet.

[Alfred.NESWADBA]

Hi,

Ok, you want your local variable to be restored, sorry, I did'nt check that.

So my ideas would be then: either check CommandEnded-event (watchign for command _UNDO) and use a stack for every variable-change or use a drawings-sysvar for saving and restoring your variable, because the sysvars (e.g. USERI1) will notice undo-commands.

In this case (I normally don't use the USER-vars) the advantage is also that you have saved it with the drawing. Because if the user changes the drawing between step 2 and step 3 your global variable will also have to be reset as the other drawing may stay at another step.

- alfred -

[JanetDavidson]

Thanks Alfred ,  I got it and I understood.

Now let's say that local vairable  instead of one,  is 500 local variables . 

In this case what would be the solution ?

Regards,

Janet.

[Alfred.NESWADBA · Accepted solution]

Hi,

store it in

• Dictionary
• ExtendedEntityData
• Block with 500 Attributes

Just a few examples 😉

- alfred -

[JanetDavidson]

Hi alfred, I like Attributes Idea, Yeah that will do the job for me.

Thanks for showing the trick.