31 lines
1.2 KiB
Groff
31 lines
1.2 KiB
Groff
'\" t
|
|
.\" $Id: cdk_process.3,v 1.3 2005/12/28 18:19:17 tom Exp $
|
|
.de XX
|
|
..
|
|
.TH cdk_process 3
|
|
.SH NAME
|
|
cdk_process \- curses widget pre/post-processing
|
|
.SH SYNOPSIS
|
|
Perform pre- and post-processing of data which is injected into a widget.
|
|
.SH DESCRIPTION
|
|
Character input is handled by each widget by its injection function.
|
|
That is typically a large case-statement consisting of the actions to
|
|
be taken for editing and scrolling keys.
|
|
The calling application can modify the behavior of the injection function
|
|
by defining either or both preprocess and postprocess functions.
|
|
.PP
|
|
Preprocessing is performed before doing anything with the injected keystroke.
|
|
If the preprocess function returns zero, no further action is taken in
|
|
the injection function.
|
|
Note that the preprocess function may do more than filter out characters;
|
|
it can fill in logic to coordinate different widgets.
|
|
.PP
|
|
Postprocessing is performed after all other actions have been done in
|
|
the injection function.
|
|
Like the other actions, it is performed only if the preprocess function
|
|
returns a nonzero value.
|
|
Unlike the preprocess function, its return value is ignored.
|
|
.SH SEE ALSO
|
|
.BR cdk (3),
|
|
.BR cdk_binding (3).
|