227 lines
7.7 KiB
Groff
227 lines
7.7 KiB
Groff
.\" $NetBSD: form_driver.3,v 1.10 2004/11/24 12:26:23 wiz Exp $
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.\"
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.\" Copyright (c) 2001
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.\" Brett Lymn - blymn@baea.com.au, brett_lymn@yahoo.com.au
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.\"
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.\" This code is donated to The NetBSD Foundation by the author.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the Author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd January 1, 2001
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.Dt FORMS 3
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.Os
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.Sh NAME
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.Nm form_driver
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.Nd form library
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.Sh LIBRARY
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.Lb libform
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.Sh SYNOPSIS
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.In form.h
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.Ft int
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.Fn form_driver "FORM *form" "int request"
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.Sh DESCRIPTION
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The
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.Fn form_driver
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is the heart of the forms library, it takes commands in the
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.Fa request
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parameter that is either a request to the driver to perform some
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action or is a character to be inserted into the current field.
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The form driver will attempt to insert any printable character passed to
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it into the current field.
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This may or may not succeed depending on the state of the current field.
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If the character passed is not
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printable then the driver attempts to process it as a driver request.
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If the character passed is not a valid request then the driver will
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return an unknown command error.
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.Sh PARAMETERS
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The forms driver recognizes the following requests:
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.Pp
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.Bl -tag -width REQ_SFIRST_FIELD -compact
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.It REQ_NEXT_PAGE
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Change to the next page in the form.
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.It REQ_PREV_PAGE
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Change to the previous page in the form.
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.It REQ_FIRST_PAGE
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Select the first page in the form.
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.It REQ_LAST_PAGE
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Go to the last page in the form.
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.It REQ_NEXT_FIELD
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Move to the next field in the form field array.
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.It REQ_PREV_FIELD
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Move to the previous field in the form field array.
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.It REQ_FIRST_FIELD
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Go to the first field in the form field array.
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.It REQ_LAST_FIELD
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Go to the last field in the form field array.
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.It REQ_SNEXT_FIELD
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Move to the next sorted field on the form.
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.It REQ_SPREV_FIELD
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Move to the previous sorted field on the form.
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.It REQ_SFIRST_FIELD
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Go to the first field in the sorted list.
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.It REQ_SLAST_FIELD
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Move to the last field in the sorted list.
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.It REQ_LEFT_FIELD
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Go one field to the left on the form page.
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.It REQ_RIGHT_FIELD
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Go one field to the right on the form page.
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.It REQ_UP_FIELD
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Go up one field on the form page.
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.It REQ_DOWN_FIELD
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Go down one field on the form page.
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.It REQ_NEXT_CHAR
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Move one char to the right within the field
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.It REQ_PREV_CHAR
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Move one char to the left within the current field.
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.It REQ_NEXT_LINE
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Go down one line in the current field.
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.It REQ_PREV_LINE
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Go up one line in the current field.
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.It REQ_NEXT_WORD
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Go forward one word in the current field
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.It REQ_PREV_WORD
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Go backward one word in the current field.
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.It REQ_BEG_FIELD
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Move the cursor to the beginning of the current field.
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.It REQ_END_FIELD
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Move the cursor to the end of the current field.
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.It REQ_BEG_LINE
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Move the cursor to the beginning of the line in the current field.
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.It REQ_END_LINE
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Move the cursor to the end of the line.
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.It REQ_LEFT_CHAR
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Move the cursor left one character
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.It REQ_RIGHT_CHAR
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Move the cursor right one character
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.It REQ_UP_CHAR
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Move the cursor up one line.
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.It REQ_DOWN_CHAR
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Move the cursor down one line.
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.It REQ_NEW_LINE
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Insert a new line at the current cursor position.
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.It REQ_INS_CHAR
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Insert a blank character at the current cursor position
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.It REQ_INS_LINE
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Open a blank line at the current cursor position.
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.It REQ_DEL_CHAR
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Delete the character at the current cursor position.
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.It REQ_DEL_PREV
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Delete the character to the left of the current cursor position.
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.It REQ_DEL_LINE
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Delete the current line.
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.It REQ_DEL_WORD
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Delete the word at the current cursor position.
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.It REQ_CLR_EOL
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Clear the field from the current cursor position to the end of the
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current line.
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.It REQ_CLR_EOF
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Clear the field from the current cursor position to the end of the field.
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.It REQ_CLR_FIELD
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Clear the field.
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.It REQ_OVL_MODE
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Enter overlay mode, characters added to the field will replace the
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ones already there.
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.It REQ_INS_MODE
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Enter insert mode, characters will be inserted at the current cursor
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position.
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Any characters to the right of the cursor will be moved
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right to accommodate the new characters.
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.It REQ_SCR_FLINE
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Scroll the field forward one line.
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.It REQ_SCR_BLINE
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Scroll the field backward one line.
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.It REQ_SCR_FPAGE
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Scroll the field forward one field page.
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.It REQ_SCR_BPAGE
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Scroll the field backward one field page.
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.It REQ_SCR_FHPAGE
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Scroll the field forward half one field page.
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.It REQ_SCR_BHPAGE
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Scroll the field backward half one field page.
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.It REQ_SCR_FCHAR
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Scroll the field horizontally forward one character
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.It REQ_SCR_BCHAR
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Scroll the field horizontally backward one character
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.It REQ_SCR_HFLINE
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Scroll the field horizontally forward one field line.
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.It REQ_SCR_HBLINE
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Scroll the field horizontally backward one field line.
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.It REQ_SCR_HFHALF
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Scroll the field horizontally forward half a field line.
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.It REQ_SCR_HBHALF
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Scroll the field horizontally backward half a field line.
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.It REQ_VALIDATION
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Request the contents of the current field be validated using any field
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validation function that has been set for the field.
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Normally, the field is validated before the current field changes.
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This request allows the current field to be validated.
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.It REQ_PREV_CHOICE
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Select the previous choice in an enumerated type field.
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.It REQ_NEXT_CHOICE
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Select the next choice in an enumerated type field.
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.El
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.Sh RETURN VALUES
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Functions returning pointers will return
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.Dv NULL
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if an error is detected.
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The functions that return an int will return one of the following error
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values:
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.Pp
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.Bl -tag -width E_UNKNOWN_COMMAND -compact
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.It Er E_OK
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The function was successful.
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.It Er E_REQUEST_DENIED
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The forms driver request could not be fulfilled
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.It Er E_UNKNOWN_COMMAND
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The passed character is not a printable character and is not a valid
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forms driver request.
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.It Er E_BAD_ARGUMENT
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A bad argument was passed to the forms driver.
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.It Er E_INVALID_FIELD
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The form passed to the driver has no valid attached fields.
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.It Er E_NOT_POSTED
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The given form is not currently posted to the screen.
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.It Er E_BAD_STATE
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The forms driver was called from within an init or term function.
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.It Er E_INVALID_FIELD
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The character passed to the forms driver fails the character
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validation for the current field.
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.El
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.Sh SEE ALSO
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.Xr curses 3 ,
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.Xr forms 3
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.Sh NOTES
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Field sorting is done by location of the field on the form page, the
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fields are sorted by position starting with the top-most, left-most
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field and progressing left to right.
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For the purposes of sorting, the
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fields top left corner is used as the sort criteria.
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The header
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.Aq Pa form.h
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automatically includes both
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.Aq Pa curses.h
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and
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.Aq Pa eti.h .
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