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form_hook (3X) | C library functions | Unix Manual Pages | :man

NAME

form_hook - set hooks for automatic invocation by applications

CONTENTS

Synopsis
Description
Return Value
See Also
Notes
Portability
Authors

SYNOPSIS

#include <form.h>
int set_field_init(FORM *form, void (*func)(FORM *));
void (*)(FORM *) field_init(const FORM *form);
int set_field_term(FORM *form, void (*func)(FORM *));
void (*)(FORM *) field_term(const FORM *form);
int set_form_init(FORM *form, void (*func)(FORM *));
void (*)(FORM *) form_init(const FORM *form);
int set_form_term(FORM *form, void (*func)(FORM *));
void (*)(FORM *) 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 return one of the following: -->
E_OK The routine succeeded.
E_SYSTEM_ERROR
System error occurred (see errno).

SEE ALSO

curses(3), form(3).

NOTES

PORTABILITY

AUTHORS


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