On May 8, 2015, at 02:46 , Charles Jenkins <cejw...@gmail.com> wrote: > > I may have a fundamental misunderstanding of how a document class, a text > view, and an undo manager work together.
It depends a bit on what kind of editing your document can have done to it. > I already tried plugging the document’s undoManager into the text view after > the NIB loads, but the text view’s undoManager property isn’t directly > settable. If you wanted a text view to use the document’s undo manager, you *could* implement the ‘windowWillReturnUndoManager:’ NSWindowDelegate method to return it. That is, you would do this in your window controller, or in your NSDocument subclass if you aren’t using a window controller, whichever is hooked up as the window delegate. I’m not sure, though, that this is what’s generally wanted. If you do so, then the keystroke undo for every text view and text field will live in your document’s undo chain, and that almost certainly isn’t what you want. Undo for text fields (and text views when the content isn’t directly your document content) is usually handled by the window-provided freestanding undo manager. In document-based apps, changes to the model are generally handled by end-editing notifications, delegate methods or bindings, and uncommitted text changes are dealt with via the “informal” NSEditor and NSEditorRegistration protocols. (Note that NSViewController and NSDocument implement support for these, but NSWindowController doesn’t, which is a big PITA.) In these scenarios, a separate window-specific undo manager is all you need. > As a text editor, shouldn’t my app have just one undo manager for each > Document, one that works for the document window and the text view contained > within it? If so, how do I configure that? In this case, the text view should probably use the document undo manager, though you may have to do extra work to coordinate its use with your document’s needs. To configure it, you should tell the text view what its undo manager is, via its ‘undoManagerForTextView:’ delegate method. I think that if you supply an undo manager this way, the text view won’t ask the window for its undo manager, so you avoid the ‘windowWillReturnUndoManager:’ process and the danger of getting tangled up with undo actions for other editing controls in the same window. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
