If you have created iLogic code that affects multiple properties or elements in Inventor, you may have noticed that although you run a single rule, you may have to click undo several times to get back to where you started. This is because each step is recorded in memory as a transaction.
The iLogic code below includes an “undo wrapper”, see Brian Ekins blog post here, explaining the concept of turning your code into a single transaction that can then be undone with a single undo.
Here is an excerpt from Brian’s blog post:
“You can combine multiple actions into a single undo using transactions. A transaction is any action that can be undone. Many, if not most, API calls are not transacted… To combine a set of actions into a single undo the API allows you to create your own transaction which wraps the other transactions.”
Here is the code that you can re-use.
'Original Code by @ClintBrown3D posted at https://clintbrown.co.uk/undo 'Based on Brian Ekins Blog post: https://modthemachine.typepad.com/my_weblog/2009/03/combining-multiple-actions-into-a-single-undo.html oDoc = ThisDoc.Document Dim CADTIP As String = "@ClintBrown3D" oNamer = "PUT YOUR RULE NAME IN HERE" Dim UNDO As Transaction UNDO = ThisApplication.TransactionManager.StartTransaction(oDoc, oNamer) 'Your iLogic code goes in here: '------------------------------------------------------------------------------------------------------------------------------------- '------------------------------------------------------------------------------------------------------------------------------------- UNDO.End
