On Jul 5, 2008, at 11:37, Georg Seifert wrote:
But than I have just another question: If I select more than one
object. All the handling of the undos of the single object I can do
in the undo/redo functions of my delegate. But how do I tell the
menu that the is "something" to undo? I would return a dummy
undoManager? How do I set this up?
For now I can live with it that undo only works with on object
selected but it would be very convenient for the users to have it in
the long term.
But the real question is, if you have multiple objects selected, which
is the desired effect of Undo? Undo the last operation in each
selected object? Undo the most recent operation done in any of the
selected objects? How will the user know what the effect of choosing
Undo will be? Without knowing the context of the problem, it sort of
sounds like a terrible idea. :)
If you must do something complicated, I suppose you could create an
additional undo manager (the "multiple selection" undo manager). Each
time a multiple selection is made, load this undo manager up with a
series of special undo actions that represent whatever behavior you
want to undoing to have, and return it via
"windowWillReturnUndoManager:". These special undo actions would be
implemented as a series of invocations of undos to the individual undo
managers, presumably.
Or something like that.
Keep in mind that getting redo to work right in all cases might be
hard or impossible. NSWindow does something along this line, using 2
undo managers, when you type into a text field in a document window
whose document has its own undo manager. But NSWindow actually gets
redo wrong in this situation.
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