On Oct 26, 2009, at 21:18, Jerry Krinock wrote:
But this answer is not as plausible if the user makes the move using
drag-drop instead of cut-paste. (Drag-drop is not implemented in
DepartmentAndEmployees, but it is common in real apps.) Clearly,
the user has now performed only one operation, and might rightfully
expect it to be undoable with a single Undo.
Actually, you're Doing It Wrong™. Look at:
http://developer.apple.com/mac/library/documentation/UserExperience/Conceptual/AppleHIGuidelines/XHIGDragDrop/XHIGDragDrop.html#//apple_ref/doc/uid/TP30000364-TPXREF30
Especially:
"The principle driving these drag-and-drop guidelines is to prevent
the user from accidental data loss. Because an Undo command in the
destination application does not trigger an Undo in the source
application, moving data across applications may result in potential
data loss."
Your drag is from one container to another, and should be a copy-
paste, not a cut-paste.
Now, if you want to argue that *your* application should play by
different rules, I won't argue, but you're going to have to do some
heavy lifting to solve the inherent 2-document undo problem.
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