.\"***************************************************************************
-.\" Copyright (c) 1998-2008,2010 Free Software Foundation, Inc. *
+.\" Copyright (c) 1998-2017,2018 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 *
.\" authorization. *
.\"***************************************************************************
.\"
-.\" $Id: form_driver.3x,v 1.21 2010/10/02 23:39:22 tom Exp $
+.\" $Id: form_driver.3x,v 1.29 2018/04/28 19:58:58 tom Exp $
.TH form_driver 3X ""
.de bP
-.IP \(bu 4
+.ie n .IP \(bu 4
+.el .IP \(bu 2
..
.SH NAME
-\fBform_driver\fR \- command-processing loop of the form system
+\fBform_driver\fR,
+\fBform_driver_w\fR \- command-processing loop of the form system
.SH SYNOPSIS
\fB#include <form.h>\fR
.br
-int form_driver(FORM *form, int c);
+\fBint form_driver(FORM *\fP\fIform\fP\fB, int \fP\fIc\fP\fB);\fP
+.br
+\fBint form_driver_w(FORM *\fP\fIform\fP\fB, int \fP\fIc\fP\fB, wchar_t \fP\fIwch\fP\fB);\fP
.br
.SH DESCRIPTION
+.SS form_driver
Once a form has been posted (displayed), you should funnel input events to it
through \fBform_driver\fR. This routine has three major input cases:
.bP
The input is a form navigation request.
Navigation request codes are constants defined in \fB<form.h>\fP,
-which are distinct from the key- and character codes returned by \fBwgetch\fP.
+which are distinct from the key- and character codes returned by \fBwgetch\fP(3X).
.bP
The input is a printable character.
Printable characters (which must be positive, less than 256) are
checked according to the program's locale settings.
.bP
The input is the KEY_MOUSE special key associated with an mouse event.
+.SS form_driver_w
+.PP
+This extension simplifies the use of the forms library using wide characters.
+The input is either a key code (a request) or a wide character
+returned by \fBget_wch\fP(3X).
+The type must be passed as well,
+to enable the library to determine whether the parameter
+is a wide character or a request.
+.SS Form-driver requests
.PP
The form driver requests are as follows:
-.TP 5
-REQ_NEXT_PAGE
-Move to the next page.
-.TP 5
-REQ_PREV_PAGE
-Move to the previous page.
-.TP 5
-REQ_FIRST_PAGE
-Move to the first page.
-.TP 5
-REQ_LAST_PAGE
-Move to the last field.
-.sp
-.TP 5
-REQ_NEXT_FIELD
-Move to the next field.
-.TP 5
-REQ_PREV_FIELD
-Move to the previous field.
-.TP 5
-REQ_FIRST_FIELD
-Move to the first field.
-.TP 5
-REQ_LAST_FIELD
-Move to the last field.
-.TP 5
-REQ_SNEXT_FIELD
-Move to the sorted next field.
-.TP 5
-REQ_SPREV_FIELD
-Move to the sorted previous field.
-.TP 5
-REQ_SFIRST_FIELD
-Move to the sorted first field.
-.TP 5
-REQ_SLAST_FIELD
-Move to the sorted last field.
-.TP 5
-REQ_LEFT_FIELD
-Move left to a field.
-.TP 5
-REQ_RIGHT_FIELD
-Move right to a field.
-.TP 5
-REQ_UP_FIELD
-Move up to a field.
-.TP 5
-REQ_DOWN_FIELD
-Move down to a field.
-.sp
-.TP 5
-REQ_NEXT_CHAR
-Move to the next char.
-.TP 5
-REQ_PREV_CHAR
-Move to the previous char.
-.TP 5
-REQ_NEXT_LINE
-Move to the next line.
-.TP 5
-REQ_PREV_LINE
-Move to the previous line.
-.TP 5
-REQ_NEXT_WORD
-Move to the next word.
-.TP 5
-REQ_PREV_WORD
-Move to the previous word.
-.TP 5
-REQ_BEG_FIELD
-Move to the beginning of the field.
-.TP 5
-REQ_END_FIELD
-Move to the end of the field.
-.TP 5
-REQ_BEG_LINE
-Move to the beginning of the line.
-.TP 5
-REQ_END_LINE
-Move to the end of the line.
-.TP 5
-REQ_LEFT_CHAR
-Move left in the field.
-.TP 5
-REQ_RIGHT_CHAR
-Move right in the field.
-.TP 5
-REQ_UP_CHAR
-Move up in the field.
-.TP 5
-REQ_DOWN_CHAR
-Move down in the field.
-.sp
-.TP 5
-REQ_NEW_LINE
-Insert or overlay a new line.
-.TP 5
-REQ_INS_CHAR
-Insert a blank at the cursor.
-.TP 5
-REQ_INS_LINE
-Insert a blank line at the cursor.
-.TP 5
-REQ_DEL_CHAR
-Delete character at the cursor.
-.TP 5
-REQ_DEL_PREV
-Delete character before the cursor.
-.TP 5
-REQ_DEL_LINE
-Delete line at the cursor.
-.TP 5
-REQ_DEL_WORD
-Delete blank-delimited word at the cursor.
-.TP 5
-REQ_CLR_EOL
-Clear to end of line from cursor.
-.TP 5
-REQ_CLR_EOF
-Clear to end of field from cursor.
-.TP 5
-REQ_CLR_FIELD
-Clear the entire field.
-.TP 5
-REQ_OVL_MODE
-Enter overlay mode.
-.TP 5
-REQ_INS_MODE
-Enter insert mode.
-.sp
-.TP 5
-REQ_SCR_FLINE
-Scroll the field forward a line.
-.TP 5
-REQ_SCR_BLINE
-Scroll the field backward a line.
-.TP 5
-REQ_SCR_FPAGE
-Scroll the field forward a page.
-.TP 5
-REQ_SCR_BPAGE
-Scroll the field backward a page.
-.TP 5
-REQ_SCR_FHPAGE
-Scroll the field forward half a page.
-.TP 5
-REQ_SCR_BHPAGE
-Scroll the field backward half a page.
-.sp
-.TP 5
-REQ_SCR_FCHAR
-Scroll the field forward a character.
-.TP 5
-REQ_SCR_BCHAR
-Scroll the field backward a character.
-.TP 5
-REQ_SCR_HFLINE
-Horizontal scroll the field forward a line.
-.TP 5
-REQ_SCR_HBLINE
-Horizontal scroll the field backward a line.
-.TP 5
-REQ_SCR_HFHALF
-Horizontal scroll the field forward half a line.
-.TP 5
-REQ_SCR_HBHALF
-Horizontal scroll the field backward half a line.
-.sp
-.TP
-REQ_VALIDATION
-Validate field.
-.TP
-REQ_NEXT_CHOICE
-Display next field choice.
-.TP
-REQ_PREV_CHOICE
-Display previous field choice.
+.TS
+l l
+_ _
+l l.
+\fIName\fR \fIDescription\fR
+REQ_BEG_FIELD Move to the beginning of the field.
+REQ_BEG_LINE Move to the beginning of the line.
+REQ_CLR_EOF Clear to end of field from cursor.
+REQ_CLR_EOL Clear to end of line from cursor.
+REQ_CLR_FIELD Clear the entire field.
+REQ_DEL_CHAR Delete character at the cursor.
+REQ_DEL_LINE Delete line at the cursor.
+REQ_DEL_PREV Delete character before the cursor.
+REQ_DEL_WORD Delete blank-delimited word at the cursor.
+REQ_DOWN_CHAR Move down in the field.
+REQ_DOWN_FIELD Move down to a field.
+REQ_END_FIELD Move to the end of the field.
+REQ_END_LINE Move to the end of the line.
+REQ_FIRST_FIELD Move to the first field.
+REQ_FIRST_PAGE Move to the first page.
+REQ_INS_CHAR Insert a blank at the cursor.
+REQ_INS_LINE Insert a blank line at the cursor.
+REQ_INS_MODE Enter insert mode.
+REQ_LAST_FIELD Move to the last field.
+REQ_LAST_PAGE Move to the last field.
+REQ_LEFT_CHAR Move left in the field.
+REQ_LEFT_FIELD Move left to a field.
+REQ_NEW_LINE Insert or overlay a new line.
+REQ_NEXT_CHAR Move to the next char.
+REQ_NEXT_CHOICE Display next field choice.
+REQ_NEXT_FIELD Move to the next field.
+REQ_NEXT_LINE Move to the next line.
+REQ_NEXT_PAGE Move to the next page.
+REQ_NEXT_PAGE Move to the next page.
+REQ_NEXT_WORD Move to the next word.
+REQ_OVL_MODE Enter overlay mode.
+REQ_PREV_CHAR Move to the previous char.
+REQ_PREV_CHOICE Display previous field choice.
+REQ_PREV_FIELD Move to the previous field.
+REQ_PREV_LINE Move to the previous line.
+REQ_PREV_PAGE Move to the previous page.
+REQ_PREV_WORD Move to the previous word.
+REQ_RIGHT_CHAR Move right in the field.
+REQ_RIGHT_FIELD Move right to a field.
+REQ_SCR_BCHAR Scroll the field backward a character.
+REQ_SCR_BHPAGE Scroll the field backward half a page.
+REQ_SCR_BLINE Scroll the field backward a line.
+REQ_SCR_BPAGE Scroll the field backward a page.
+REQ_SCR_FCHAR Scroll the field forward a character.
+REQ_SCR_FHPAGE Scroll the field forward half a page.
+REQ_SCR_FLINE Scroll the field forward a line.
+REQ_SCR_FPAGE Scroll the field forward a page.
+REQ_SCR_HBHALF Horizontal scroll the field backward half 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_HFLINE Horizontal scroll the field forward a line.
+REQ_SFIRST_FIELD Move to the sorted first field.
+REQ_SLAST_FIELD Move to the sorted last field.
+REQ_SNEXT_FIELD Move to the sorted next field.
+REQ_SPREV_FIELD Move to the sorted previous field.
+REQ_UP_CHAR Move up in the field.
+REQ_UP_FIELD Move up to a field.
+REQ_VALIDATION Validate field.
+.TE
.PP
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.
-.SS MOUSE HANDLING
+.SS Field validation
+The form library makes updates to the window associated with form fields rather than
+directly to the field buffers.
+.PP
+The form driver provides low-level control over updates to the form fields.
+The form driver also provides for validating modified fields to ensure that the contents
+meet whatever constraints an application may attach using \fBset_field_type\fP.
+.PP
+.PP
+You can validate a field without making any changes to it using
+\fBREQ_VALIDATION\fP.
+The form driver also validates a field in these cases:
+.bP
+a call to \fBset_current_field\fP attempts to move to a different field.
+.bP
+a call to \fBset_current_page\fP attempts to move to a different page of the form.
+.bP
+a request attempts to move to a different field.
+.bP
+a request attempts to move to a different page of the form.
+.PP
+In each case, the move fails if the field is invalid.
+.PP
+If the modified field is valid, the form driver copies the modified
+data from the window associated with the field
+to the field buffer.
+.SS Mouse handling
.PP
If the second argument is the KEY_MOUSE special key, the associated
mouse event is translated into one of the above pre-defined requests.
.PP
If you clicked outside the user window or the mouse event could not be translated
into a form request an \fBE_REQUEST_DENIED\fR is returned.
-.SS APPLICATION-DEFINED COMMANDS
+.SS Application-defined commands
.PP
If the second argument is neither printable nor one of the above
pre-defined form requests, the driver assumes it is an application-specific
.B E_INVALID_FIELD
Contents of field is invalid.
.TP 5
+.B E_NOT_CONNECTED
+No fields are connected to the form.
+.TP 5
.B E_REQUEST_DENIED
The form driver could not process the request.
.TP 5
.SH SEE ALSO
\fBcurses\fR(3X),
\fBform\fR(3X),
+\fBform_field_buffer\fR(3X),
+\fBform_field_validation\fR(3X),
+\fBform_fieldtype\fR(3X),
\fBform_variables\fR(3X),
\fBgetch\fR(3X).
.SH NOTES
.SH AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
S. Raymond.
-.\"#
-.\"# The following sets edit modes for GNU EMACS
-.\"# Local Variables:
-.\"# mode:nroff
-.\"# fill-column:79
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