In OCAF ,Can we save Undo/Redo information & retrieve it while loading the file in next session?

Kavin Prasad
Tue, 08/24/2021 - 17:06

Forums:

Hi everyone, I am creating a TDocStd_Document doc class with BinOCAF format with SetModificationMode(true) & SetUndoLimit(40); and attached few attributes and modified them and could get undos and redos while on session but when I save this to a .cbf file and reload it, the undo-redo transactions are lost. Is there a way to save and reterive the undo transactions even after the session is closed? Can anyone help

Attachments:

load file with undo.PNG

Mikhail MPV
Wed, 08/25/2021 - 09:03

Hi Kavin,

There is no possibility to store the undo/redo information in the OCCT TDocStd_Document. As I know, this is out of scope of the functionality of most standard applications.

Kavin Prasad
Wed, 08/25/2021 - 12:19

Hi Mikhail,
Thank you very much for the reply. Is there any other possible ways to save and restore changes. Do you have any ideas?

Mikhail MPV
Wed, 08/25/2021 - 14:31

Kavin,

You can take all information about all deltas using GetUndos and GetRedos method of TDocStd_Document. You could store and then retrieve all this data by creation of special file format for them.

Or, of course, there is a common simple but silly way to save the document every time a transaction is committed. So, you will have a ready state of the document with every transaction to restore it.