It looks like time to subclass or extend and add the functionality you need.
Sent from my iPhone On Apr 27, 2019, at 7:26 PM, Richard Charles <rcharles...@gmail.com> wrote: >> On Apr 7, 2019, at 11:03 AM, Quincey Morris >> <quinceymor...@rivergatesoftware.com> wrote: >> >>> On Apr 5, 2019, at 20:55 , Richard Charles <rcharles...@gmail.com> wrote: >>> >>> Sending the text field an abortEditing message does not work. How can >>> changes to the text field be discarded? >> >> Caveat: I don’t know the answer to what you’re asking, but I suspect you may >> be asking the wrong question. >> >> First of all, what does “does not work” mean? > > > Sending the text field an abortEditing message results in no changes to the > text field. Nothing happens. > > >> Second, looking at the documentation here: >> >> https://developer.apple.com/documentation/appkit/nscontrol >> >> the “abortEditing” method is listed under “Managing the Field Editor”. I >> suspect it’s actually used internally to manage the relationship between the >> text field’s cell and the field editor, and not to manage the editing state >> of the control as a while. This method is probably just the wrong hammer for >> this nail. >> >> Third, what I think you’re looking for is “discardEditing”, which is a part >> of the NSEditor protocol, to which NSTextField conforms. However, I’m not >> entirely sure about timing, whether it’s reasonable to invoke in response to >> “attemptRecoveryFromError:…”. But maybe. > > > According to macOS 10.13 documentation (NSKeyValueBinding.h) discardEditing > is implemented by controllers, CoreData's managed object contexts, and user > interface elements. > > However upon searching the macOS SDK, discardEditing is only implemented by > by NSController and NSViewController. It is not implemented by any user > interface elements. Testing has confirmed that NSTextField does not implement > discardEditing. > > Sending the array controller bound to the text field a discardEditing message > does’t work either. Nothing happens. Switching back to a standard cocoa value > binding and placing symbolic breakpoints on -[NSController discardEditing] > and -[NSArrayController discardEditing] shows that when the user clicks > "Discard Change" in the alert panel, discardEditing is never called. So the > cocoa frameworks are using some other means to discard the change from the > text field. > > >> Note that the documentation for NSEditor shows its methods as deprecated: >> >> https://developer.apple.com/documentation/appkit/view_management/nseditor >> >> I believe this is a documentation error. At some point, NSEditor was >> converted from an informal protocol to a formal protocol (so it would >> translate into Swift properly), and that causes this error in the >> documentation. If you look at the actual header file (NSKeyValueBinding.h), >> you can see that the formal NSEditor protocol has no deprecations: >> >>> @protocol NSEditor <NSObject> >>> >>> - (void)discardEditing; // … >>> - (BOOL)commitEditing; // … >> >> as well as the deprecations of the information protocol methods: >> >>> @interface NSObject (NSEditor) >>> - (void)discardEditing NS_DEPRECATED_MAC(10_0, API_TO_BE_DEPRECATED, "This >>> is now a method of the NSEditor protocol."); >>> - (BOOL)commitEditing NS_DEPRECATED_MAC(10_0, API_TO_BE_DEPRECATED, "This >>> is now a method of the NSEditor protocol.”); > > > In summary testing has shown that discardEditing messages are sent to > controllers which are bound to a text field during normal operation. But when > the user chooses "Discard Change" in an alert panel a discardEditing message > is never sent. The frameworks are using some other means to discard the > change from the text field. > > So this all is a bit of a mystery how to programmatically discard a change > from a text field bound to an array controller. > > --Richard Charles > > _______________________________________________ > > 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/zav%40mac.com > > This email sent to z...@mac.com _______________________________________________ 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
