Re: Filtering characters into CAPI text-input-pane
Kevin,
Why not use the change-callback for text-input-pane?
It's called every time the text or caret position is changed. You can
filter and replace the text, along with the caret position. (See CAPI
Reference Manual for text-input-pane.)
Laughing Water
On Jan 10, 2008, at 12:55 PM, Kevin Rosenberg wrote:
>
> Thanks again for the list for the great help with the title in frame
> information. The application is coming along well, but there is a
> feature I'd like to implement and I wonder how to best accomplish
> that.
>
> I'd like to have a text-input-pane that will only accept
> positive, floating-point numbers. That is, characters [0-9\.]
> The :confirm-change-function looks perfect for the job of restricting
> non-numeric characters, but is only implemented on Motif.
>
> One potential work around I though of is that when the input is done,
> and if there are invalid characters, to blank the field, beep, and
> reset focus to the field. Another work-around is to use
> text-input-range, but that only supports integers.
>
> My first preference is to just prevent invalid characters from being
> entered in this first place. Since :confirm-change-function isn't
> available on all platforms, is there another possibility that I'm not
> seeing, like applying a filter to stream of input characters?
>
> Thanks in advance for any ideas,
>
> Kevin
>
>