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   form_hook.3x    ( 3 )

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Имя (Name)

form_hook - set hooks for automatic invocation by applications

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Синопсис (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);

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Описание (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).

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Возвращаемое значение (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(3)).

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Смотри также (See also)

curses(3X), form(3X).

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Примечание (Note)

The header file <form.h> automatically includes the header file
       <curses.h>.

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Портативность (Portability)

These routines emulate the System V forms library.  They were not
       supported on Version 7 or BSD versions.

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