hook(3FORM) hook(3FORM)
NAME
form_hook - set hooks for automatic invocation by applications
SYNOPSIS
#include <form.h>
int set_field_init(FORM *form, Form_Hook func);
Form_Hook field_init(const FORM *form);
int set_field_term(FORM *form, Form_Hook func);
Form_Hook field_term(const FORM *form);
int set_form_init(FORM *form, Form_Hook func);
Form_Hook form_init(const FORM *form);
int set_form_term(FORM *form, Form_Hook func);
Form_Hook form_term(const FORM *form);
DESCRIPTION
These functions make it possible to set hook functions to be called at
various points in the automatic processing of input event codes by
form_driver.
The function set_field_init sets a hook to be called at form-post time
and each time the selected field changes (after the change).
field_init returns the current field init hook, if any (NULL if there
is no such hook).
The function set_field_term sets a hook to be called at form-unpost
time and each time the selected field changes (before the change).
field_term returns the current field term hook, if any (NULL if there
is no such hook).
The function set_form_init sets a hook to be called at form-post time
and just after a page change once it is posted. form_init returns the
current form init hook, if any (NULL if there is no such hook).
The function set_form_term sets a hook to be called at form-unpost time
and just before a page change once it is posted. form_init returns the
current form term hook, if any (NULL if there is no such hook).
RETURN VALUE
Routines that return pointers return NULL on error. Other routines re-
turn one of the following:
E_OK The routine succeeded.
E_SYSTEM_ERROR
System error occurred (see errno(3)).
SEE ALSO
ncurses(3NCURSES), form(3FORM).
NOTES
The header file <form.h> automatically includes the header file
<curses.h>.
PORTABILITY
These routines emulate the System V forms library. They were not sup-
ported on Version 7 or BSD versions.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
Raymond.
hook(3FORM)
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