102 lines
4.6 KiB
Plaintext
102 lines
4.6 KiB
Plaintext
'\" t
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.\"***************************************************************************
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.\" Copyright 2018-2019,2020 Thomas E. Dickey *
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.\" Copyright 1998-2007,2010 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: form_hook.3x,v 1.16 2020/10/18 00:06:29 tom Exp $
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.TH form_hook 3X ""
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.SH NAME
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\fBform_hook\fR \- set hooks for automatic invocation by applications
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.SH SYNOPSIS
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\fB#include <form.h>\fR
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.sp
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\fBint set_field_init(FORM *\fP\fIform\fP\fB, Form_Hook \fP\fIfunc\fP\fB);\fP
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.br
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\fBForm_Hook field_init(const FORM *\fP\fIform\fP\fB);\fP
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.sp
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\fBint set_field_term(FORM *\fP\fIform\fP\fB, Form_Hook \fP\fIfunc\fP\fB);\fP
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.br
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\fBForm_Hook field_term(const FORM *\fP\fIform\fP\fB);\fP
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.sp
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\fBint set_form_init(FORM *\fP\fIform\fP\fB, Form_Hook \fP\fIfunc\fP\fB);\fP
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.br
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\fBForm_Hook form_init(const FORM *\fP\fIform\fP\fB);\fP
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.sp
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\fBint set_form_term(FORM *\fP\fIform\fP\fB, Form_Hook \fP\fIfunc\fP\fB);\fP
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.br
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\fBForm_Hook form_term(const FORM *\fP\fIform\fP\fB);\fP
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.br
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.SH DESCRIPTION
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These functions make it possible to set hook functions to be called at various
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points in the automatic processing of input event codes by \fBform_driver\fR.
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.PP
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The function \fBset_field_init\fR sets a hook to be called at form-post time
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and each time the selected field changes (after the change).
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\fBfield_init\fR
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returns the current field init hook, if any (\fBNULL\fR if there is no such
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hook).
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.PP
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The function \fBset_field_term\fR sets a hook to be called at form-unpost time
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and each time the selected field changes (before the change).
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\fBfield_term\fR
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returns the current field term hook, if any (\fBNULL\fR if there is no such
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hook).
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.PP
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The function \fBset_form_init\fR sets a hook to be called at form-post time and
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just after a page change once it is posted.
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\fBform_init\fR returns the
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current form init hook, if any (\fBNULL\fR if there is no such hook).
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.PP
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The function \fBset_form_term\fR sets a hook to be called at form-unpost time
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and just before a page change once it is posted.
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\fBform_init\fR
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returns the current form term hook, if any (\fBNULL\fR if there is no such
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hook).
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.SH RETURN VALUE
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Routines that return pointers return \fBNULL\fR on error.
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Other routines
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return one of the following:
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.TP 5
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.B E_OK
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The routine succeeded.
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.TP 5
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.B E_SYSTEM_ERROR
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System error occurred (see \fBerrno\fR(3)).
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBform\fR(3X).
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.SH NOTES
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The header file \fB<form.h>\fR automatically includes the header file
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\fB<curses.h>\fR.
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.SH PORTABILITY
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These routines emulate the System V forms library.
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They were not supported on
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Version 7 or BSD versions.
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.SH AUTHORS
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Juergen Pfeifer.
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Manual pages and adaptation for new curses by Eric S. Raymond.
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