downstream
/
ncurses


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377
							<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<!-- 
  ****************************************************************************
  * Copyright (c) 1998-2007,2008 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
  * "Software"), to deal in the Software without restriction, including      *
  * without limitation the rights to use, copy, modify, merge, publish,      *
  * distribute, distribute with modifications, sublicense, and/or sell       *
  * copies of the Software, and to permit persons to whom the Software is    *
  * furnished to do so, subject to the following conditions:                 *
  *                                                                          *
  * The above copyright notice and this permission notice shall be included  *
  * in all copies or substantial portions of the Software.                   *
  *                                                                          *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  *                                                                          *
  * Except as contained in this notice, the name(s) of the above copyright   *
  * holders shall not be used in advertising or otherwise to promote the     *
  * sale, use or other dealings in this Software without prior written       *
  * authorization.                                                           *
  ****************************************************************************
  * @Id: form_driver.3x,v 1.16 2008/06/21 21:55:39 tom Exp @
-->
<HTML>
<HEAD>
<TITLE>form_driver 3x</TITLE>
<link rev=made href="mailto:bug-ncurses@gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</HEAD>
<BODY>
<H1>form_driver 3x</H1>
<HR>
<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>                                         <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>


</PRE>
<H2>NAME</H2><PRE>
       <STRONG>form_driver</STRONG> - command-processing loop of the form system


</PRE>
<H2>SYNOPSIS</H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>
       int form_driver(FORM *form, int c);


</PRE>
<H2>DESCRIPTION</H2><PRE>
       Once a form has been posted (displayed), you should funnel
       input events to it through <STRONG>form_driver</STRONG>.  This routine  has
       three major input cases:

       -  The  input  is  a  form navigation request.  Navigation
          request codes are constants defined in <STRONG>&lt;form.h&gt;</STRONG>,  which
          are distinct from the key- and character codes returned
          by <STRONG>wgetch</STRONG>.

       -  The input is a printable character.  Printable  charac-
          ters  (which  must  be  positive,  less  than  256) are
          checked according to the program's locale settings.

       -  The input is the KEY_MOUSE special key associated  with
          an mouse event.

       The form driver requests are as follows:

       REQ_NEXT_PAGE
            Move to the next page.

       REQ_PREV_PAGE
            Move to the previous page.

       REQ_FIRST_PAGE
            Move to the first page.

       REQ_LAST_PAGE
            Move to the last field.


       REQ_NEXT_FIELD
            Move to the next field.

       REQ_PREV_FIELD
            Move to the previous field.

       REQ_FIRST_FIELD
            Move to the first field.

       REQ_LAST_FIELD
            Move to the last field.

       REQ_SNEXT_FIELD
            Move to the sorted next field.

       REQ_SPREV_FIELD
            Move to the sorted previous field.

       REQ_SFIRST_FIELD
            Move to the sorted first field.

       REQ_SLAST_FIELD
            Move to the sorted last field.

       REQ_LEFT_FIELD
            Move left to a field.

       REQ_RIGHT_FIELD
            Move right to a field.

       REQ_UP_FIELD
            Move up to a field.

       REQ_DOWN_FIELD
            Move down to a field.


       REQ_NEXT_CHAR
            Move to the next char.

       REQ_PREV_CHAR
            Move to the previous char.

       REQ_NEXT_LINE
            Move to the next line.

       REQ_PREV_LINE
            Move to the previous line.

       REQ_NEXT_WORD
            Move to the next word.

       REQ_PREV_WORD
            Move to the previous word.

       REQ_BEG_FIELD
            Move to the beginning of the field.

       REQ_END_FIELD
            Move to the end of the field.

       REQ_BEG_LINE
            Move to the beginning of the line.

       REQ_END_LINE
            Move to the end of the line.

       REQ_LEFT_CHAR
            Move left in the field.

       REQ_RIGHT_CHAR
            Move right in the field.

       REQ_UP_CHAR
            Move up in the field.

       REQ_DOWN_CHAR
            Move down in the field.


       REQ_NEW_LINE
            Insert or overlay a new line.

       REQ_INS_CHAR
            Insert a blank at the cursor.

       REQ_INS_LINE
            Insert a blank line at the cursor.

       REQ_DEL_CHAR
            Delete character at the cursor.

       REQ_DEL_PREV
            Delete character before the cursor.

       REQ_DEL_LINE
            Delete line at the cursor.

       REQ_DEL_WORD
            Delete blank-delimited word at the cursor.

       REQ_CLR_EOL
            Clear to end of line from cursor.

       REQ_CLR_EOF
            Clear to end of field from cursor.

       REQ_CLR_FIELD
            Clear the entire field.

       REQ_OVL_MODE
            Enter overlay mode.

       REQ_INS_MODE
            Enter insert mode.


       REQ_SCR_FLINE
            Scroll the field forward a line.

       REQ_SCR_BLINE
            Scroll the field backward a line.

       REQ_SCR_FPAGE
            Scroll the field forward a page.

       REQ_SCR_BPAGE
            Scroll the field backward a page.

       REQ_SCR_FHPAGE
            Scroll the field forward half a page.

       REQ_SCR_BHPAGE
            Scroll the field backward half a page.


       REQ_SCR_FCHAR
            Scroll the field forward a character.

       REQ_SCR_BCHAR
            Scroll the field backward a character.

       REQ_SCR_HFLINE
            Horizontal scroll the field forward a line.

       REQ_SCR_HBLINE
            Horizontal scroll the field backward a line.

       REQ_SCR_HFHALF
            Horizontal scroll the field forward half a line.

       REQ_SCR_HBHALF
            Horizontal scroll the field backward half a line.


       REQ_VALIDATION
            Validate field.

       REQ_NEXT_CHOICE
            Display next field choice.

       REQ_PREV_CHOICE
            Display previous field choice.

       If  the  second  argument  is  a  printable character, the
       driver places it in the current position  in  the  current
       field.   If  it is one of the forms requests listed above,
       that request is executed.

   <STRONG>MOUSE</STRONG> <STRONG>HANDLING</STRONG>
       If the second argument is the KEY_MOUSE special  key,  the
       associated mouse event is translated into one of the above
       pre-defined requests.  Currently only clicks in  the  user
       window  (e.g.  inside the form display area or the decora-
       tion window) are handled.

       If you click above the display region of the form:

              a REQ_PREV_FIELD is generated for a single click,

              a REQ_PREV_PAGE is generated for a double-click and

              a REQ_FIRST_FIELD is generated for a  triple-click.

       If you click below the display region of the form:

              a REQ_NEXT_FIELD is generated for a single click,

              a REQ_NEXT_PAGE is generated for a double-click and

              a REQ_LAST_FIELD is generated for a triple-click.

       If you click at an field inside the display  area  of  the
       form:

              -  the form cursor is positioned to that field.

              -  If  you double-click a field, the form cursor is
                 positioned to that field  and  <STRONG>E_UNKNOWN_COMMAND</STRONG>
                 is  returned.   This  return  value makes sense,
                 because a double click  usually  means  that  an
                 field-specific action should be returned.  It is
                 exactly the purpose of this return value to sig-
                 nal  that an application specific command should
                 be executed.

              -  If  a  translation  into  a  request  was  done,
                 <STRONG>form_driver</STRONG>  returns the result of this request.

       If you clicked outside the user window or the mouse  event
       could   not   be   translated   into  a  form  request  an
       <STRONG>E_REQUEST_DENIED</STRONG> is returned.

   <STRONG>APPLICATION-DEFINED</STRONG> <STRONG>COMMANDS</STRONG>
       If the second argument is neither printable nor one of the
       above  pre-defined form requests, the driver assumes it is
       an application-specific command and returns <STRONG>E_UNKNOWN_COM-</STRONG>
       <STRONG>MAND</STRONG>.  Application-defined commands should be defined rel-
       ative to <STRONG>MAX_COMMAND</STRONG>, the  maximum  value  of  these  pre-
       defined requests.


</PRE>
<H2>RETURN VALUE</H2><PRE>
       <STRONG>form_driver</STRONG> returns one of the following error codes:

       <STRONG>E_OK</STRONG> The routine succeeded.

       <STRONG>E_BAD_ARGUMENT</STRONG>
            Routine  detected  an incorrect or out-of-range argu-
            ment.

       <STRONG>E_BAD_STATE</STRONG>
            Routine was called from an initialization or termina-
            tion function.

       <STRONG>E_NOT_POSTED</STRONG>
            The form has not been posted.

       <STRONG>E_INVALID_FIELD</STRONG>
            Contents of field is invalid.

       <STRONG>E_REQUEST_DENIED</STRONG>
            The form driver could not process the request.

       <STRONG>E_SYSTEM_ERROR</STRONG>
            System error occurred (see <STRONG>errno</STRONG>).

       <STRONG>E_UNKNOWN_COMMAND</STRONG>
            The form driver code saw an unknown request code.


</PRE>
<H2>SEE ALSO</H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="wgetch.3x.html">wgetch(3x)</A></STRONG>.


</PRE>
<H2>NOTES</H2><PRE>
       The header file <STRONG>&lt;form.h&gt;</STRONG> automatically includes the header
       files <STRONG>&lt;curses.h&gt;</STRONG>.


</PRE>
<H2>PORTABILITY</H2><PRE>
       These routines emulate the System V forms  library.   They
       were not supported on Version 7 or BSD versions.


</PRE>
<H2>AUTHORS</H2><PRE>
       Juergen  Pfeifer.   Manual  pages  and  adaptation for new
       curses by Eric S. Raymond.


                                                        <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
</PRE>
<HR>
<ADDRESS>
Man(1) output converted with
<a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
</ADDRESS>
</BODY>
</HTML>