> On Apr 19, 2016, at 5:28 PM, Quincey Morris
> <quinceymor...@rivergatesoftware.com> wrote:
>
> On Apr 19, 2016, at 16:11 , Richard Charles <rcharles...@gmail.com> wrote:
>>
>> I have a NSTextField with a NSFormatter. When the user enters an incorrect
>> value an alert sheet drops down from the document window stating “Please
>> provide a valid value.”.
>
> Is the text field bound to a NSObjectController, or how does it get/set its
> value from/to the data model?
Yes, the text field is bound to an NSArrayController.
> My memory is vague on this, but I think that obnoxious sheet comes from the
> NSObjectController rather than the NSFormatter.
I am not sure where the alert sheet comes from but I discovered it uses the
responder chain. After much trial and error the following NSResponder override
seems to work well in my NSTextField subclass.
- (void)presentError:(NSError *)error modalForWindow:(NSWindow *)window
delegate:(id)delegate didPresentSelector:(SEL)didPresentSelector
contextInfo:(void *)contextInfo
{
NSBeep();
[self abortEditing];
[self.window makeFirstResponder:self];
}
The default implementation of this method presents an error alert to the user
as a document-modal sheet attached to the document window. Instead we simply
beep, abort editing, and reset the text field for editing again.
The documentation cautions against overriding this method but I could not find
anything else that worked.
--Richard Charles
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