Re: One NSTextView, several model objects - how to synchronise undo manager
Re: One NSTextView, several model objects - how to synchronise undo manager
- Subject: Re: One NSTextView, several model objects - how to synchronise undo manager
- From: Rui Pacheco <email@hidden>
- Date: Fri, 19 Mar 2010 16:35:37 +0000
You are right, I forgot to check the delegate methods.
On 17 March 2010 14:41, Keith Blount <email@hidden> wrote:
> I might be missing something, but can you not just use the NSTextView
> delegate message, -undoManagerForTextView:? This is what I do in my app. I
> have a single text view that can have various text storage objects swapped
> into it, and I have each of those text storages associated with a different
> NSUndoManager. I use -undoManagerForTextView: to return whichever undo
> manager corresponds to the current text object, so that the user's undoes
> affect the currently loaded text and the user can load up a text he or she
> worked on earlier and hitting undo will undo whatever they last did in that
> particular text.
>
> Hope that helps.
> All the best,
> Keith
>
> --- original message ---
>
> Is there a way to bind the text view's undo manager to an instance of
> NSUndoManager on my model object?
>
> I can get to the text view undo manager but I don't seem to be able to set
> it.
>
> On 17 March 2010 13:34, Keary Suska <email@hidden> wrote:
>
> > On Mar 16, 2010, at 6:09 PM, Rui Pacheco wrote:
> >
> > > I've a window with a fairly complex layout - one NSTextView and several
> > > tables, all displaying different types of data. To keep things in
> order,
> > > I've created a model object that holds the data for all these interface
> > > elements. The window may also hold several instances of the model
> object
> > and
> > > I list them in a table.
> > >
> > > My problem is how to keep the undo manager for the text view
> synchronised
> > > with a particular instance of a model object. As the user switches
> > between
> > > model objects, I want him to be able to do cmd + z transparently with
> the
> > > window knowing what changed in that particular instance.
> > >
> > > Some research seems to indicate that using core data would give me this
> > for
> > > free - make my model objects extend NSManagedObject and I would have
> undo
> > > for free. Is this correct?
> >
> > More or less. You may want to keep in mind that "out of the box" that
> undos
> > will be tracked in the order they are registered across all objects.
> I.e.,
> > user changes textfield value, tabs to textview and makes a change, then
> hits
> > undo twice, the textfield change will get undone.
> >
> > HTH,
> >
> > Keary Suska
> > Esoteritech, Inc.
> > "Demystifying technology for your home or business"
> >
> >
>
>
>
>
>
--
Best regards,
Rui Pacheco
_______________________________________________
Cocoa-dev mailing list (email@hidden)
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:
This email sent to email@hidden