Undo and Redo
- Last UpdatedMay 25, 2022
- 1 minute read
It is possible to undo and redo many operations. The undo mechanism is managed by AVEVA E3D Design using a stack of transaction objects.
Each transaction object records the change in the state across the transaction.
The new descriptions are then:
MARKDB ‘comment’ - Complete the current transaction and starts a new transaction.
UNDODB - Undo the last transaction. If there is a current transaction then this is completed. Multiple Undos are allowed.
REDODB - Redo to next mark. Multiple Redos are allowed. A redo is only valid after an UNDO. Any database change after an UNDO invalidates a REDO.