becomeFirstResponder and key equiv. for OK button

[Alain Birtz]

The action for the OK button check if the editable NSTextField
hold valid date. For error the faulty NSTextField is set to
first responder with becomeFirstResponder.

This work fine when the OK button is clicked but when the Return key
(key equiv. for the OK button) is hit becomeFirstResponder does nothing:
the text cursor stay in the (wrong) NSTextField.

The OK action method is called but becomeFirstResponder does nothing.

(NSTextField and button in NSPanel)

What can I do ?

Thank you.

[Chris Hanson]

In article <abz-0908031757460001@192.168.1.3>, Alain Birtz
<abz@videotron.ca> wrote:

> The action for the OK button check if the editable NSTextField
> hold valid date.

You should try to do this with a formatter, if possible. If you just
need to ensure that the date the user entered is properly formatted, an
NSDateFormatter will do this for you automatically and even allow
natural-language entry (like "today" and "Friday").

If you need to do something more complicated like validate a date
range, then what you're doing now is probably an acceptable solution.
(It'd be better though not to let the user enter out-of-range dates to
begin with, but that is more complex to code.)

> For error the faulty NSTextField is set to
> first responder with becomeFirstResponder.

You should be using -[NSWindow makeFirstResponder:] instead, since the
first responder is really a property of the window. The documentation
for -[NSResponder becomeFirstResponder] says this quite explicitly.
("Never invoke this method directly.")

-[NSWindow makeFirstResponder:] ensures that the current first
responder is resigned, if possible, and that the responder is changed,
if possible, and will return NO if for some reason it's not possible.

-- Chris

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Chris Hanson, bDistributed.com, Inc. | Email: [email]cmh@bDistributed.com[/email]
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