Adding to my own post I just found this in my snippets collection:
This listing shows how you draw such a focus ring. It requires you to override
the NSCell drawWithFrame:inView: In this method, if the cell is supposed to
draw evidence of first-responder status, set the rectangle for the focus ring,
call NSSetFocusRingStyle with an argument of NSFocusRingOnly, and then create
and fill a bezier path defining that rectangle. Filling in this case simply
draws the ring.
- (void)drawWithFrame:(NSRect)cellFrame inView:(NSView *)controlView;
{
// other stuff might happen here
if ([self showsFirstResponder]) {
// showsFirstResponder is set for us by the NSControl that is drawing
us.
NSRect focusRingFrame = cellFrame;
focusRingFrame.size.height -= 2.0f;
[NSGraphicsContextsaveGraphicsState];
NSSetFocusRingStyle(NSFocusRingOnly);
[[NSBezierPath bezierPathWithRect: NSInsetRect(focusRingFrame, 4.0f,
4.0f)] fill];
[NSGraphicsContext restoreGraphicsState];
}
// other stuff might happen here
}
So possibly you could create your own NSTextFieldCell, set your NSTextField to
use it, call [super drawWithFrame.....] somewhere in the above method to do the
standard drawing and move on from there. The flashing could be implemented
using a CALayer animation or something.
If you manage to implement this you should make it open source :-) since I
guess it's quite a bit of work to get it done.
> Read carefully:
>
> The original poster stated: "any more text" - or are you suggesting that he
> should disable the text box when a certain number of characters are reached?
> I guess not.
>
> AFAIK, the focus ring is not accessible programmatically, except form setting
> it by making something the first responder.
>
> You could use a text formatter or one of the validation methods and simply
> stop accepting key strokes, change the text color to red and/or display an
> alert.
>
> Am 06.10.2011 um 17:43 schrieb Thomas Davie:
>
>> The correct way to notify a user that he can't enter text in a text box is
>> to disabled it.
>>
>> Bob
>> if (*ra4 != 0xffc78948) { return false; }
>>
>> On 6 Oct 2011, at 16:33, Nick wrote:
>>
>>> Hello
>>> I am wondering if there's a way to do this, notifying the user that he can't
>>> enter any more text into NSTextField edit box?
>>> Is there a way to change the color of the NSTextField's focus ring to red
>>> (to highlight that this is an error)?
>>> How difficult would that be to implement?
>>> Thank you!
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