SOLVED Undo of inserting a tag

I have a tag plugin where I move tags from one object to another.
I tried several Undo types, but I cannot get it working.
What to do?

            childTags = child.GetTags()
            ....
            for childTag in childTags:
                #doc.AddUndo(c4d.UNDOTYPE_CHANGE, object)
                doc.AddUndo(c4d.UNDOTYPE_HIERARCHY_PSR, object)
                object.InsertTag(childTag)
                #doc.AddUndo(c4d.UNDOTYPE_NEW, object)

Hi,

undo-steps for inserting objects have to be added after the the object has been inserted; the appropriate flag is then c4d.UNDOTYPE_NEW. Could you describe in more detail what is not working?

Cheers,
zipit

Hello,

an undo-step has to start with StartUndo() and must end with EndUndo(). In between, you can add operations to that undo-step with AddUndo(). As @zipit has shown, the undo-operation for adding something to the document is c4d.UNDOTYPE_NEW.

doc.StartUndo()

ttag = c4d.TextureTag()
op.InsertTag(ttag)

doc.AddUndo(c4d.UNDOTYPE_NEW, ttag)
doc.EndUndo() 

See also Undo System Manual.

best wishes,
Sebastian

Also, if you want to move a tag, you first have to remove it from the original object. So you don't insert, you change the position of the tag in the scene graph.

doc.StartUndo()

doc.AddUndo(c4d.UNDOTYPE_CHANGE, tag)

tag.Remove()
op.InsertTag(tag)

doc.EndUndo()