272 lines
10 KiB
Plaintext
272 lines
10 KiB
Plaintext
.\"***************************************************************************
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.\" Copyright 2018-2019,2020 Thomas E. Dickey *
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.\" Copyright 1998-2016,2017 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" holders shall not be used in advertising or otherwise to promote the *
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.\" sale, use or other dealings in this Software without prior written *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.\" $Id: form_driver.3x,v 1.35 2020/12/19 21:34:15 tom Exp $
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.TH form_driver 3X ""
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.de bP
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.ie n .IP \(bu 4
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.el .IP \(bu 2
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..
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.SH NAME
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\fBform_driver\fR,
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\fBform_driver_w\fR \- command-processing loop of the form system
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.SH SYNOPSIS
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\fB#include <form.h>\fR
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.sp
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\fBint form_driver(FORM *\fP\fIform\fP\fB, int \fP\fIc\fP\fB);\fP
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.br
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\fBint form_driver_w(FORM *\fP\fIform\fP\fB, int \fP\fIc\fP\fB, wchar_t \fP\fIwch\fP\fB);\fP
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.br
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.SH DESCRIPTION
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.SS form_driver
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Once a form has been posted (displayed), you should funnel input events to it
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through \fBform_driver\fR. This routine has three major input cases:
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.bP
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The input is a form navigation request.
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Navigation request codes are constants defined in \fB<form.h>\fP,
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which are distinct from the key- and character codes returned
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by \fBwgetch\fP(3X).
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.bP
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The input is a printable character.
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Printable characters (which must be positive, less than 256) are
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checked according to the program's locale settings.
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.bP
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The input is the KEY_MOUSE special key associated with an mouse event.
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.SS form_driver_w
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.PP
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This extension simplifies the use of the forms library using wide characters.
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The input is either a key code (a request) or a wide character
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returned by \fBget_wch\fP(3X).
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The type must be passed as well,
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to enable the library to determine whether the parameter
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is a wide character or a request.
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.SS Form-driver requests
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.PP
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The form driver requests are as follows:
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.TS
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l l
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_ _
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l l.
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\fIName\fR \fIDescription\fR
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REQ_BEG_FIELD Move to the beginning of the field.
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REQ_BEG_LINE Move to the beginning of the line.
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REQ_CLR_EOF Clear to end of field from cursor.
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REQ_CLR_EOL Clear to end of line from cursor.
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REQ_CLR_FIELD Clear the entire field.
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REQ_DEL_CHAR Delete character at the cursor.
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REQ_DEL_LINE Delete line at the cursor.
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REQ_DEL_PREV Delete character before the cursor.
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REQ_DEL_WORD Delete blank-delimited word at the cursor.
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REQ_DOWN_CHAR Move down in the field.
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REQ_DOWN_FIELD Move down to a field.
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REQ_END_FIELD Move to the end of the field.
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REQ_END_LINE Move to the end of the line.
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REQ_FIRST_FIELD Move to the first field.
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REQ_FIRST_PAGE Move to the first page.
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REQ_INS_CHAR Insert a blank at the cursor.
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REQ_INS_LINE Insert a blank line at the cursor.
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REQ_INS_MODE Enter insert mode.
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REQ_LAST_FIELD Move to the last field.
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REQ_LAST_PAGE Move to the last field.
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REQ_LEFT_CHAR Move left in the field.
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REQ_LEFT_FIELD Move left to a field.
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REQ_NEW_LINE Insert or overlay a new line.
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REQ_NEXT_CHAR Move to the next char.
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REQ_NEXT_CHOICE Display next field choice.
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REQ_NEXT_FIELD Move to the next field.
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REQ_NEXT_LINE Move to the next line.
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REQ_NEXT_PAGE Move to the next page.
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REQ_NEXT_PAGE Move to the next page.
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REQ_NEXT_WORD Move to the next word.
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REQ_OVL_MODE Enter overlay mode.
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REQ_PREV_CHAR Move to the previous char.
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REQ_PREV_CHOICE Display previous field choice.
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REQ_PREV_FIELD Move to the previous field.
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REQ_PREV_LINE Move to the previous line.
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REQ_PREV_PAGE Move to the previous page.
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REQ_PREV_WORD Move to the previous word.
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REQ_RIGHT_CHAR Move right in the field.
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REQ_RIGHT_FIELD Move right to a field.
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REQ_SCR_BCHAR Scroll the field backward a character.
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REQ_SCR_BHPAGE Scroll the field backward half a page.
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REQ_SCR_BLINE Scroll the field backward a line.
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REQ_SCR_BPAGE Scroll the field backward a page.
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REQ_SCR_FCHAR Scroll the field forward a character.
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REQ_SCR_FHPAGE Scroll the field forward half a page.
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REQ_SCR_FLINE Scroll the field forward a line.
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REQ_SCR_FPAGE Scroll the field forward a page.
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REQ_SCR_HBHALF Horizontal scroll the field backward half a line.
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REQ_SCR_HBLINE Horizontal scroll the field backward a line.
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REQ_SCR_HFHALF Horizontal scroll the field forward half a line.
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REQ_SCR_HFLINE Horizontal scroll the field forward a line.
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REQ_SFIRST_FIELD Move to the sorted first field.
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REQ_SLAST_FIELD Move to the sorted last field.
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REQ_SNEXT_FIELD Move to the sorted next field.
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REQ_SPREV_FIELD Move to the sorted previous field.
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REQ_UP_CHAR Move up in the field.
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REQ_UP_FIELD Move up to a field.
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REQ_VALIDATION Validate field.
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.TE
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.PP
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If the second argument is a printable character, the driver places it
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in the current position in the current field.
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If it is one of the forms
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requests listed above, that request is executed.
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.SS Field validation
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The form library makes updates to the window associated
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with form fields rather than directly to the field buffers.
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.PP
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The form driver provides low-level control over updates to the form fields.
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The form driver also provides for validating modified fields
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to ensure that the contents
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meet whatever constraints an application may attach using \fBset_field_type\fP.
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.PP
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.PP
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You can validate a field without making any changes to it using
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\fBREQ_VALIDATION\fP.
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The form driver also validates a field in these cases:
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.bP
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a call to \fBset_current_field\fP attempts to move to a different field.
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.bP
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a call to \fBset_current_page\fP attempts to move
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to a different page of the form.
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.bP
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a request attempts to move to a different field.
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.bP
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a request attempts to move to a different page of the form.
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.PP
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In each case, the move fails if the field is invalid.
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.PP
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If the modified field is valid, the form driver copies the modified
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data from the window associated with the field
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to the field buffer.
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.SS Mouse handling
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.PP
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If the second argument is the KEY_MOUSE special key, the associated
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mouse event is translated into one of the above pre-defined requests.
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Currently only clicks in the user window (e.g., inside the form display
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area or the decoration window) are handled.
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.PP
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If you click above the display region of the form:
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.RS 3
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.TP
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a REQ_PREV_FIELD is generated for a single click,
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.TP
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a REQ_PREV_PAGE is generated for a double-click and
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.TP
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a REQ_FIRST_FIELD is generated for a triple-click.
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.RE
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.PP
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If you click below the display region of the form:
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.RS 3
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.TP
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a REQ_NEXT_FIELD is generated for a single click,
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.TP
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a REQ_NEXT_PAGE is generated for a double-click and
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.TP
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a REQ_LAST_FIELD is generated for a triple-click.
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.RE
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.PP
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If you click at an field inside the display area of the form:
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.RS 3
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.bP
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the form cursor is positioned to that field.
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.bP
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If you double-click a field,
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the form cursor is positioned to that field
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and \fBE_UNKNOWN_COMMAND\fR is returned.
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This return value makes sense,
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because a double click usually means that an field-specific action should
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be returned.
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It is exactly the purpose of this return value to signal that an
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application specific command should be executed.
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.bP
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If a translation
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into a request was done, \fBform_driver\fR returns the result of this request.
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.RE
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.PP
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If you clicked outside the user window
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or the mouse event could not be translated
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into a form request an \fBE_REQUEST_DENIED\fR is returned.
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.SS Application-defined commands
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.PP
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If the second argument is neither printable nor one of the above
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pre-defined form requests, the driver assumes it is an application-specific
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command and returns \fBE_UNKNOWN_COMMAND\fR. Application-defined commands
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should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
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pre-defined requests.
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.SH RETURN VALUE
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\fBform_driver\fR returns one of the following error codes:
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.TP 5
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.B E_OK
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The routine succeeded.
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.TP 5
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.B E_BAD_ARGUMENT
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Routine detected an incorrect or out-of-range argument.
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.TP 5
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.B E_BAD_STATE
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Routine was called from an initialization or termination function.
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.TP 5
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.B E_NOT_POSTED
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The form has not been posted.
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.TP 5
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.B E_INVALID_FIELD
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Contents of field is invalid.
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.TP 5
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.B E_NOT_CONNECTED
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No fields are connected to the form.
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.TP 5
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.B E_REQUEST_DENIED
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The form driver could not process the request.
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.TP 5
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.B E_SYSTEM_ERROR
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System error occurred (see \fBerrno\fR(3)).
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.TP 5
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.B E_UNKNOWN_COMMAND
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The form driver code saw an unknown request code.
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.
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.SH SEE ALSO
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\fBcurses\fR(3X),
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\fBform\fR(3X),
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\fBform_fieldtype\fR(3X),
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\fBform_field_buffer\fR(3X),
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\fBform_field_validation\fR(3X),
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\fBform_variables\fR(3X),
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\fBgetch\fR(3X).
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.SH NOTES
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The header file \fB<form.h>\fR automatically includes the header files
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\fB<curses.h>\fR.
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.SH PORTABILITY
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These routines emulate the System V forms library.
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They were not supported on
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Version 7 or BSD versions.
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.SH AUTHORS
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Juergen Pfeifer.
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Manual pages and adaptation for new curses by Eric S. Raymond.
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