ncurses/man/form_driver.3x - nest-cam/4320010/ncurses - Git at Google

 .\"***************************************************************************
 .\" Copyright (c) 1998-2010,2015 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 1.24 2015/08/02 18:21:11 tom Exp $
 .TH form_driver 3X ""
 .de bP
 .IP \(bu 4
 ..
 .SH NAME
 \fBform_driver\fR \- command-processing loop of the form system
 .SH SYNOPSIS
 \fB#include <form.h>\fR
 .br
 \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(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:
 .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
 .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.
 Currently only clicks in the user window (e.g., inside the form display
 area or the decoration window) are handled.
 .PP
 If you click above the display region of the form:
 .RS 3
 .TP
 a REQ_PREV_FIELD is generated for a single click,
 .TP
 a REQ_PREV_PAGE is generated for a double-click and
 .TP
 a REQ_FIRST_FIELD is generated for a triple-click.
 .RE
 .PP
 If you click below the display region of the form:
 .RS 3
 .TP
 a REQ_NEXT_FIELD is generated for a single click,
 .TP
 a REQ_NEXT_PAGE is generated for a double-click and
 .TP
 a REQ_LAST_FIELD is generated for a triple-click.
 .RE
 .PP
 If you click at an field inside the display area of the form:
 .RS 3
 .bP
 the form cursor is positioned to that field.
 .bP
 If you double-click a field,
 the form cursor is positioned to that field
 and \fBE_UNKNOWN_COMMAND\fR 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 signal that an
 application specific command should be executed.
 .bP
 If a translation
 into a request was done, \fBform_driver\fR returns the result of this request.
 .RE
 .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
 .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
 command and returns \fBE_UNKNOWN_COMMAND\fR.  Application-defined commands
 should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
 pre-defined requests.
 .SH RETURN VALUE
 \fBform_driver\fR returns one of the following error codes:
 .TP 5
 .B E_OK
 The routine succeeded.
 .TP 5
 .B E_BAD_ARGUMENT
 Routine detected an incorrect or out-of-range argument.
 .TP 5
 .B E_BAD_STATE
 Routine was called from an initialization or termination function.
 .TP 5
 .B E_NOT_POSTED
 The form has not been posted.
 .TP 5
 .B E_INVALID_FIELD
 Contents of field is invalid.
 .TP 5
 .B E_REQUEST_DENIED
 The form driver could not process the request.
 .TP 5
 .B E_SYSTEM_ERROR
 System error occurred (see \fBerrno\fR).
 .TP 5
 .B E_UNKNOWN_COMMAND
 The form driver code saw an unknown request code.
 .
 .SH SEE ALSO
 \fBcurses\fR(3X),
 \fBform\fR(3X),
 \fBform_variables\fR(3X),
 \fBgetch\fR(3X).
 .SH NOTES
 The header file \fB<form.h>\fR automatically includes the header files
 \fB<curses.h>\fR.
 .SH PORTABILITY
 These routines emulate the System V forms library.  They were not supported on
 Version 7 or BSD versions.
 .SH AUTHORS
 Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric
 S. Raymond.
	.\"***************************************************************************
	.\" Copyright (c) 1998-2010,2015 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 1.24 2015/08/02 18:21:11 tom Exp $
	.TH form_driver 3X ""
	.de bP
	.IP \(bu 4
	..
	.SH NAME
	\fBform_driver\fR \- command-processing loop of the form system
	.SH SYNOPSIS
	\fB#include <form.h>\fR
	.br
	\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(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:
	.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
	.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.
	Currently only clicks in the user window (e.g., inside the form display
	area or the decoration window) are handled.
	.PP
	If you click above the display region of the form:
	.RS 3
	.TP
	a REQ_PREV_FIELD is generated for a single click,
	.TP
	a REQ_PREV_PAGE is generated for a double-click and
	.TP
	a REQ_FIRST_FIELD is generated for a triple-click.
	.RE
	.PP
	If you click below the display region of the form:
	.RS 3
	.TP
	a REQ_NEXT_FIELD is generated for a single click,
	.TP
	a REQ_NEXT_PAGE is generated for a double-click and
	.TP
	a REQ_LAST_FIELD is generated for a triple-click.
	.RE
	.PP
	If you click at an field inside the display area of the form:
	.RS 3
	.bP
	the form cursor is positioned to that field.
	.bP
	If you double-click a field,
	the form cursor is positioned to that field
	and \fBE_UNKNOWN_COMMAND\fR 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 signal that an
	application specific command should be executed.
	.bP
	If a translation
	into a request was done, \fBform_driver\fR returns the result of this request.
	.RE
	.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
	.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
	command and returns \fBE_UNKNOWN_COMMAND\fR. Application-defined commands
	should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
	pre-defined requests.
	.SH RETURN VALUE
	\fBform_driver\fR returns one of the following error codes:
	.TP 5
	.B E_OK
	The routine succeeded.
	.TP 5
	.B E_BAD_ARGUMENT
	Routine detected an incorrect or out-of-range argument.
	.TP 5
	.B E_BAD_STATE
	Routine was called from an initialization or termination function.
	.TP 5
	.B E_NOT_POSTED
	The form has not been posted.
	.TP 5
	.B E_INVALID_FIELD
	Contents of field is invalid.
	.TP 5
	.B E_REQUEST_DENIED
	The form driver could not process the request.
	.TP 5
	.B E_SYSTEM_ERROR
	System error occurred (see \fBerrno\fR).
	.TP 5
	.B E_UNKNOWN_COMMAND
	The form driver code saw an unknown request code.
	.
	.SH SEE ALSO
	\fBcurses\fR(3X),
	\fBform\fR(3X),
	\fBform_variables\fR(3X),
	\fBgetch\fR(3X).
	.SH NOTES
	The header file \fB<form.h>\fR automatically includes the header files
	\fB<curses.h>\fR.
	.SH PORTABILITY
	These routines emulate the System V forms library. They were not supported on
	Version 7 or BSD versions.
	.SH AUTHORS
	Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
	S. Raymond.