In my app's window there is an NSTextView, a place in which to enter
notes associated with a selected object. Currently, when the user is
finished editing those notes and switches to a different view (like
clicking in another text area), I capture that edit session and store
the new notes by calling -setNotes: on that object; this creates an
Undo action, allowing the user to undo the entire edit session in one
fell swoop.
I had initially turned on the "Undo" flag in IB for that text view, so
that the user could undo (and redo) "sub-edits" while the edit session
was in progress ("Undo Typing" is pushed onto the Undo stack by the
text view, apparently), while my custom Undo action pushed onto the
Undo stack would undo the entire edit session itself ("Undo Edit
Notes").
I find when I do this, with the text view's Undo flag enabled, there
is some "zombie" undo action left on the Undo stack, that does
nothing, and doesn't go away.
Here's the entire process:
1. Select and object and start typing in the Notes field
2. The Edit menu contains "Undo Typing", and does just that--reverts
the typing while I'm in still in that text view.
3. If I select "Undo Typing", that works, and now the Edit menu
contains "Redo Typing" (there is no Undo available, and it is
disabled). Redo works, and the Edit menu contains "Undo Typing" (and
Redo is disabled).
4. With changes in the text view, I click a different text area in the
window; this action ultimately causes the object's -setNotes: method
to be called, in which I set up the Undo action with the current notes
and then update the object with the new notes.
5. The Edit menu now contains "Undo Edit Notes" (Redo is disabled).
6. If I select "Undo Edit Notes", the change is reverted; the Edit
menu now contains "Redo Edit Notes", but also an enabled "Undo" item.
7. At this point, I can select "Undo" as long as I have the patience
to continue doing so. Nothing (apparent) happens, I never get to the
end of the Undo stack, and *my* "Redo Edit Notes" Undo action remains
available.
8. I can select my "Redo Edit Notes", and the right thing happens; the
Edit menu goes back to "Undo Edit Notes" (Redo is disabled) and
selecting it again takes me back to step 7, ad infinitum.
I can only assume this anonymous "Undo" action is left over from the
NSTextView undo stack (since using that is the only way I can get this
to appear). Turning off the Undo flag for that text view in IB makes
this all go away. I s'pose I could liberally interpret the customer's
"specification" to make my custom Undo action the "right" thing to do
(and eliminate the undo ability whilst editing the field), but that
just doesn't sit right with me.
But I haven't been able to figure out why this anonymous Undo action
is left on the stack, or a good away to get rid of it, or even figure
out what happens when I select it.
Any ideas?
Thanks!
randy
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