Re: forms: set_field_type, submit button

[Thomas Dickey]

On Tue, 26 Apr 2005, Moritz Beller wrote:

> Hello,
>
> providing the user with a form to enter integers, it sometimes happens
> that you want to allow a specific open-end range to be input, i.e. from
> 49151 to infinity, as you may wish when asking for a port number (as we
> don't want to mess up the registered ports, neither the well known
> ones). Regularly, you'd expect an expression such as
> set_field_type(field, TYPE_INTEGER, 0, 1024); to work, but in this case,
> since we exceed the range of signed integer anyway, ncurses' current
> set_fiel_type isn't much of a help.

As I understand your question - you could define your own field type
and make up whatever rules you needed.  (That reply sounds familiar -
I think the topic came up on this list about a year ago).  The 
form/fty_XXX.c files in ncurses source implement the different types,
and aren't that hard to follow.

> My second question is regarding a form, the user has just filled out.
> I'd like to have an OK button beyond the fields so that the user has to
> actually leave the last field in order to proceed, which sets the
> field's buffer to the correct value. How'd you achieve such a button?
> Feel free to mail your own ideas, if you disagree with the OP's submit
> button suggestion.

I think you could do it by making your program keep track of the 
keystrokes (it has to anyway), and when doing a next-field from the last 
field of the form, translate that into an application code that your 
program can use to switch to the Ok/Cancel buttons.  I don't recall any 
example within ncurses that does that sort of traversal, but dialog does 
it (I've made the logic for the bottom row of buttons reusable for the 
different widgets).

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net