path: root/dialog.3

.\" $Id: dialog.3,v 1.76 2012/07/03 08:22:10 tom Exp $
.\" Copyright 2005-2011,2012  Thomas E. Dickey
.\"
.\" This program is free software; you can redistribute it and/or modify
.\" it under the terms of the GNU Lesser General Public License, version 2.1
.\" as published by the Free Software Foundation.
.\"
.\" This program is distributed in the hope that it will be useful, but
.\" WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
.\" Lesser General Public License for more details.
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.\"	Free Software Foundation, Inc.
.\"	51 Franklin St., Fifth Floor
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.\"
.\" definitions for renaming
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.ds l dialog
.ds L Dialog
.ds D DIALOG
.
.de ES
.ne 8
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..
.de EX
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.\" Bulleted paragraph
.de bP
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.TH \*D 3 "" "$Date: 2012/07/03 08:22:10 $"
.SH NAME
\*l \- widgets and utilities for the \*p program
.SH SYNOPSIS
.B cc [ flag ... ] file ...  -l\*l [ library ... ]
.br
\ \ \ or
.br
.B cc `\*p-config --cflags` file ... `\*p-config --libs` ]
.sp
.B #include <\*l.h>
.PP
\fB\*L\fP
is a program that will let you to present a variety of questions or
display messages using dialog boxes from a shell script.
It is built from the \fB\*l\fP library,
which consists of several widgets
as well as utility functions that are used by the widgets
or the main program.
.
.SH DESCRIPTION
This manpage documents the features from \fI<\*l.h>\fP which
are likely to be important to developers using the widgets directly.
Some hints are also given for developing new widgets.
.
.\" ************************************************************************
.SH DEFINITIONS
Exit codes (passed back to the main program for its use)
are defined with a "\fIDLG_EXIT_\fP prefix.
The defined constants can be mapped using environment variables
as described in \fB\*p\fP(1),
e.g., \fIDLG_EXIT_OK\fP corresponds to \fI$DIALOG_OK\fP.
.PP
Useful character constants which correspond to user input
are named with the "\fICHR_\fP" prefix, e.g.,
\fICHR_BACKSPACE\fP.
.PP
Colors and video attributes are categorized and associated with
settings in the configuration file
(see the discussion of \fI$DIALOGRC\fP in \fB\*p\fP(1)).
The \fIDIALOG_ATR(n)\fP macro is used for defining the references
to the combined color and attribute table \fBdlg_color_table[]\fP.
.PP
The \fB\*p\fP application passes its command-line parameters
to the widget functions.  Some of those parameters are single values,
but some of the widgets accept data as an array of values.
Those include checklist/radiobox, menubox and formbox.
When the \fB--item-help\fP option is given, an extra column
of data is expected.
The USE_ITEM_HELP(), CHECKBOX_TAGS, MENUBOX_TAGS and FORMBOX_TAGS
macros are used to hide this difference from the calling application.
.PP
Most of the other definitions found in \fI<\*l.h>\fP
are used for convenience in building the library or main program.
These include definitions based on the generated \fI<dlg_config.h>\fP header.

.\" ************************************************************************
.SH DATA STRUCTURES
All of the global data for the \fB\*l\fP library is stored in
a few structures: \fIDIALOG_STATE\fP, \fIDIALOG_VARS\fP and \fIDIALOG_COLORS\fP.
The corresponding \fBdialog_state\fP, \fBdialog_vars\fP and \fBdlg_color_table\fP
global variables should be initialized to zeros,
and then populated with the data to use.
A few of these must be nonzero for the corresponding widgets to function.
As as the case with function names,
variables beginning with "\fIdialog_\fP"
are designed for use by the calling application
while variables beginning with "\fIdlg_\fP"
are intended for lower levels, e.g., by the \fB\*l\fP library.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.all_subwindows
This is a linked list of all subwindows created by the library.
The \fBdlg_del_window\fP function uses this
to free storage for subwindows when deleting a window.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.all_windows
This is a linked list of all windows created by the library.
The \fBdlg_del_window\fP function uses this to locate windows which
may be redrawn after deleting a window.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.aspect_ratio
This corresponds to the command-line option "\fB--aspect-ratio\fP".
The value gives the application
some control over the box dimensions when using auto
sizing (specifying 0 for height and width).
It represents width / height.
The default is 9, which means 9 characters wide to every 1 line high.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.getc_callbacks
This is setup in \fIui_getc.c\fP to record windows which must be polled
for input, e.g,. to handle the background tailbox widget.
One window is designated as the foreground or control window.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.getc_redirect
If the control window for \fIDIALOG_STATE.getc_callbacks\fP is
closed, the list is transferred to this variable.
Closing all windows causes the application to exit.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.no_mouse
This corresponds to the command-line option "\fB--no-mouse\fP".
If true, \fB\*p\fP will not initialize (and enable) the mouse in
\fIinit_dialog\fP.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.output
This is set in the \fB\*p\fP application to the stream on
which the application and library functions may write text results.
Normally that is the standard error,
since the curses library prefers to write its data to the standard output.
Some scripts, trading portability for convenience,
prefer to write results to the standard output,
e.g., by using the "\fB--stdout\fP" option.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.output_count
This is incremented by \fBdlg_does_output\fP,
which is called by each widget that writes text to the output.
The \fB\*p\fP application uses that to decide if it should
also write a separator, i.e.,
\fIDIALOG_STATE.separate_str\fP,
between calls to each widget.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.pipe_input
This is set in \fIinit_dialog\fP to a stream which can be used by the
\fBgauge\fP widget, which must be the application's standard input.
The \fB\*p\fP application calls \fIinit_dialog\fP normally with
\fIinput\fP set to the standard input, but optionally based on the
"\fB--input-fd\fP" option.
Since the application cannot read from
a pipe (standard input) and at the same time read
the curses input from the standard input,
it must allow for reopening the latter from either
a specific file descriptor,
or directly from the terminal.
The adjusted pipe stream value is stored in this variable.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.screen_initialized
This is set in \fIinit_dialog\fP and
reset in \fIend_dialog\fP.
It is used to check if curses has been initialized,
and if the \fIendwin\fP function must be called on exit.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.screen_output
This is set in \fIinit_dialog\fP to the output stream used
by the curses library.
Normally that is the standard output,
unless that happens to not be a terminal (and if \fIinit_dialog\fP can
successfully open the terminal directly).
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.separate_str
This corresponds to the command-line option "\fB--separate-widget\fP".
The given string
specifies a string that will separate the output on \fB\*p\fP's output from
each widget.
This is used to simplify parsing the result of a dialog with several widgets.
If this option is not given,
the default separator string is a tab character.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.tab_len
This corresponds to the command-line option "\fB--tab-len\fP \fInumber\fP".
Specify the number of spaces that a tab character occupies if the
"\fB--tab-correct\fP"
option is given.
The default is 8.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.trace_output
This corresponds to the command-line option "\fB--trace\fP \fIfile\fP".
It is the file pointer to which trace messages are written.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.use_colors
This is set in \fIinit_dialog\fP if the curses implementation supports color.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.use_scrollbar
This corresponds to the command-line option "\fB--scrollbar\fP".
If true,
draw a scrollbar to make windows holding scrolled data more readable.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.use_shadow
This corresponds to the command-line option "\fB--no-shadow\fP".
This is set in \fIinit_dialog\fP if the curses implementation supports color.
If true,
suppress shadows that would be drawn to the right and bottom of each dialog box.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_STATE.visit_items
This corresponds to the command-line option "\fB--visit-items\fP".
.\" ---------------------------------------------------------------------------
.PP
The \fB\*p\fP application resets the \fBdialog_vars\fP data before
accepting options to invoke each widget.
Most of the \fIDIALOG_VARS\fP members are set directly from \fB\*p\fP's
command-line options:
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.ascii_lines
This corresponds to the command-line option "\fB--ascii-lines\fP.
It causes line-drawing to be done with ASCII characters, e.g., "+" and "-".
See \fIDIALOG_VARS.no_lines\fP.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.backtitle
This corresponds to the command-line option "\fB--backtitle\fP \fIbacktitle\fP".
It specifies a
\fIbacktitle\fP
string to be displayed on the backdrop, at the top of the screen.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.beep_after_signal
This corresponds to the command-line option "\fB--beep-after\fP".
If true, beep after a user has completed a widget by pressing one of the buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.beep_signal
This corresponds to the command-line option "\fB--beep\fP".
It is obsolete.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.begin_set
This is true if the command-line option "\fB--begin y x\fP" was used.
It specifies the position of the upper left corner of a dialog box on the screen.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.begin_x
This corresponds to the \fIx\fP value from
the command-line option "\fB--begin\fP \fIy x\fP" (second value).
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.begin_y
This corresponds to the \fIy\fP value from
the command-line option "\fB--begin\fP \fIy x\fP" (first value).
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.cancel_label
This corresponds to the command-line option "\fB--cancel-label\fP \fIstring\fP".
The given \fIstring\fP overrides the label used for "Cancel" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.cant_kill
This corresponds to the command-line option "\fB--no-kill\fP".
If true, this tells
\fB\*p\fP
to put the
\fBtailboxbg\fP
box in the background,
printing its process id to \fB\*p\fP's output.
SIGHUP is disabled for the background process.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.colors
This corresponds to the command-line option "\fB--colors\fP".
If true, interpret embedded "\\Z" sequences in the dialog text
by the following character,
which tells \fB\*p\fP to set colors or video attributes:
0 through 7 are the ANSI codes used in curses:
black,
red,
green,
yellow,
blue,
magenta,
cyan and
white respectively.
Bold is set by 'b', reset by 'B'.
Reverse is set by 'r', reset by 'R'.
Underline is set by 'u', reset by 'U'.
The settings are cumulative, e.g., "\\Zb\\Z1" makes the following text
bright red.
Restore normal settings with "\\Zn".
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.column_separator
This corresponds to the command-line option "\fB--column-separator\fP".
\fB\*L\fP splits data for radio/checkboxes and menus on the
occurrences of the given string, and aligns the split data into columns.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.cr_wrap
This corresponds to the command-line option "\fB--cr-wrap\fP".
If true,
interpret embedded newlines in the dialog text as a newline on the screen.
Otherwise, \fB\*p\fR will only wrap lines where needed to fit inside the text box.
Even though you can control line breaks with this,
\fB\*p\fR will still wrap any lines that are too long for the width of the box.
Without cr-wrap, the layout of your text may be formatted to look nice
in the source code of your script without affecting the way it will
look in the dialog.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.date_format
This corresponds to the command-line option "\fB--date-format\fP \fIstring\fP".
If the host provides \fBstrftime\fP, and the value is nonnull,
the calendar widget uses this to format its output.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.default_button
This is set by the command-line option "\fB--default-button\fP.
It is used by \fBdlg_default_button\fP.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.default_item
This corresponds to the command-line option "\fB--default-item\fP \fIstring\fP".
The given string is used as
the default item in a checklist, form or menu box.
Normally the first item in the box is the default.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.defaultno
This corresponds to the command-line option "\fB--defaultno\fP".
If true,
make the default value of the
\fByes/no\fP
box a
.BR No .
Likewise, make the default button of widgets that provide "OK" and "Cancel"
a \fBCancel\fP.
If \fB--nocancel\fP was given that option overrides this,
making the default button always "Yes" (internally the same as "OK").
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.dlg_clear_screen
This corresponds to the command-line option "\fB--clear\fP".
This option is implemented in the main program, not the library.
If true,
the screen will be cleared on exit.
This may be used alone, without other options.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.exit_label
This corresponds to the command-line option "\fB--exit-label string\fP".
The given string overrides the label used for "EXIT" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.extra_button
This corresponds to the command-line option "\fB--extra-button\fP".
If true, some widgets show an extra button,
between "OK" and "Cancel" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.extra_label
This corresponds to the command-line option "\fB--extra-label\fP \fIstring\fP".
The given string overrides the label used for "Extra" buttons.
Note: for inputmenu widgets, this defaults to "Rename".
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.formitem_type
This is set by the command-line option "\fB--passwordform\fP"
to tell the form widget that its text fields should be treated like
password widgets.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.help_button
This corresponds to the command-line option "\fB--help-button\fP".
If true, some widgets show a help-button after "OK" and "Cancel" buttons,
i.e., in checklist, radiolist and menu boxes.
If \fB--item-help\fR is also given, on exit
the return status will be the same as for the "OK" button,
and the item-help text will be written to \fB\*p\fP's output after the token "HELP".
Otherwise, the return status will indicate that the Help button was pressed,
and no message printed.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.help_file
This corresponds to the command-line option "\fB--hfile\fP \fIstring\fP".
The given filename is passed to \fBdialog_helpfile\fP when the user
presses F1.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.help_label
This corresponds to the command-line option "\fB--help-label\fP \fIstring\fP".
The given string overrides the label used for "Help" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.help_line
This corresponds to the command-line option "\fB--hline\fP \fIstring\fP".
The given string is displayed in the bottom of dialog windows,
like a subtitle.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.help_status
This corresponds to the command-line option "\fB--help-status\fP".
If true, and the the help-button is selected,
writes the checklist or radiolist information
after the item-help "HELP" information.
This can be used to reconstruct the state of a checklist after processing
the help request.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.input_length
This is nonzero if \fIDIALOG_VARS.input_result\fP is allocated,
versus being a pointer to the user's local variables.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.input_menu
This flag is set to denote whether the menubox widget
implements a menu versus a inputmenu widget.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.input_result
This may be either a user-supplied buffer,
or a buffer dynamically allocated by the library,
depending on \fIDIALOG_VARS.input_length\fP:
.RS
.bP
If \fIDIALOG_VARS.input_length\fP is zero,
this is a pointer to user buffer (on the stack, or static).
The buffer size is assumed to be \fBMAX_LEN\fP,
which is defined in \fI<\*l.h>\fP.
.bP
When \fIDIALOG_VARS.input_length\fP is nonzero,
this is a dynamically-allocated buffer used by the widgets to return
printable results to the calling application.
.RE
.IP
Certain widgets copy a result to this buffer.
If the pointer is NULL, or if the length is insufficient for
the result, then the \fB\*l\fP library allocates a buffer which is large enough,
and sets \fIDIALOG_VARS.input_length\fP.
Callers should check for this case if they have supplied their own buffer.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.insecure
This corresponds to the command-line option "\fB--insecure\fP".
If true, make the password widget friendlier but less secure,
by echoing asterisks for each character.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.in_helpfile
This variable is used to prevent \fBdialog_helpfile\fP from showing
anything, e.g., if F1 were pressed within a help-file display. 
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.item_help
This corresponds to the command-line option "\fB--item-help\fP".
If true,
interpret the tags data for checklist, radiolist and menu boxes
adding a column whose text is displayed in the bottom line of the
screen, for the currently selected item.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.keep_tite
This is set by the command-line option "\fB--keep-tite\fP"
to tell \fB\*p\fP to not attempt to cancel the terminal initialization
(termcap \fIti\fP/\fIte\fP) sequences which correspond to xterm's alternate-screen
switching.
Normally \fB\*p\fP does this to avoid flickering when run several times
in a script.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.keep_window
This corresponds to the command-line option "\fB--keep-window\fP".
If true, do not remove/repaint the window on exit.
This is useful for keeping the window contents visible when several
widgets are run in the same process.
Note that curses will clear the screen when starting a new process.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.max_input
This corresponds to the command-line option "\fB--max-input\fP \fIsize\fP".
Limit input strings to the given size.
If not specified, the limit is 2048.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.no_label
This corresponds to the command-line option "\fB--no-label\fP \fIstring\fP".
The given string overrides the label used for "No" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.no_lines
This corresponds to the command-line option "\fB--no-lines\fP.
It suppresses line-drawing.
See \fIDIALOG_VARS.ascii_lines\fP.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.no_nl_expand
This corresponds to the command-line option "\fB--no-nl-expand\fP".
If false, \fBdlg_trim_string\fP converts literal "\\n" substrings
in a message into newlines.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.nocancel
This corresponds to the command-line option "\fB--no-cancel\fP".
If true,
suppress the "Cancel" button in checklist, inputbox and menu box modes.
A script can still test if the user pressed the ESC key to cancel to quit.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.nocollapse
This corresponds to the command-line option "\fB--no-collapse\fP".
Normally \fB\*p\fR converts tabs to spaces and reduces multiple
spaces to a single space for text which is displayed in a message boxes, etc.
It true, that feature is disabled.
Note that \fB\*p\fR will still wrap text, subject to the \fB--cr-wrap\fR
option.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.nook
This corresponds to the command-line option "\fB--nook\fP.
\fB\*L\fP will suppress the "ok" (or "yes") button from the widget.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.ok_label
This corresponds to the command-line option "\fB--ok-label\fP \fIstring\fP".
The given string overrides the label used for "OK" buttons.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.print_siz
This corresponds to the command-line option "\fB--print-size\fP".
If true,
each widget prints its size to \fB\*p\fP's output when it is invoked.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.quoted
This corresponds to the command-line option "\fB--quoted\fP.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.separate_output
This corresponds to the command-line option "\fB--separate-output\fP".
If true,
checklist widgets output result one line at a time, with no quoting.
This facilitates parsing by another program.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.single_quoted
This corresponds to the command-line option "\fB--single-quoted\fP".
If true,
Use single-quoting as needed (and no quotes if unneeded) for the
output of checklist's as well as the item-help text.
If this option is not set, \fB\*p\fP uses double quotes around each item.
The latter requires occasional use of backslashes to make the output useful in
shell scripts.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.size_err
This corresponds to the command-line option "\fB--size-err\fP".
If true,
check the resulting size of a dialog box before trying to use it,
printing the resulting size if it is larger than the screen.
(This option is obsolete, since all new-window calls are checked).
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.sleep_secs
This corresponds to the command-line option "\fB--sleep\fP \fIsecs\fP".
This option is implemented in the main program, not the library.
If nonzero, this is the number of seconds after to delay after processing a dialog box.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.tab_correct
This corresponds to the command-line option "\fB--tab-correct\fP".
If true, convert each tab character of the text to one or more spaces.
Otherwise, tabs are rendered according to the curses library's interpretation.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.time_format
This corresponds to the command-line option "\fB--time-format\fP \fIstring\fP".
If the host provides \fBstrftime\fP, and the value is nonnull,
the timebox widget uses this to format its output.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.timeout_secs
This corresponds to the command-line option "\fB--timeout\fP \fIsecs\fP".
If nonzero, timeout input requests (exit with error code)
if no user response within the given number of seconds.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.title
This corresponds to the command-line option "\fB--title\fP \fItitle\fP".
Specifies a
\fItitle\fP
string to be displayed at the top of the dialog box.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.trim_whitespace
This corresponds to the command-line option "\fB--trim\fP".
If true, eliminate leading blanks,
trim literal newlines and repeated blanks from message text.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.visit_items
This corresponds to the command-line option "\fB--visit-items\fP".
Modify the tab-traversal of checklist, radiobox, menubox and inputmenu
to include the list of items as one of the states.
This is useful as a visual aid,
i.e., the cursor position helps some users.
.\" ---------------------------------------------------------------------------
.IP \fIDIALOG_VARS.yes_label
This corresponds to the command-line option "\fB--yes-label\fP \fIstring\fP".
The given string overrides the label used for "Yes" buttons.
.
.\" ************************************************************************
.\" ************************************************************************
.SH WIDGETS
Functions that implement major functionality for the command-line \fB\*p\fP
program, e.g., widgets, have names beginning "\fIdialog_\fP".

All dialog boxes have at least three parameters:
.TP 5
\fItitle\fP
the caption for the box, shown on its top border.
.TP 5
\fIheight\fP
the height of the dialog box.
.TP 5
\fIwidth\fP
the width of the dialog box.
.PP
Other parameters depend on the box type.
.
.\" ************************************************************************
.IP \fBdialog_calendar
implements the "\fB--calendar\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIsubtitle
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the height excluding the fixed-height calendar grid.
.TP 5
.B int \fIwidth
is the overall width of the box,
which is adjusted up to the calendar grid's minimum width if needed.
.TP 5
.B int \fIday
is the initial day of the week shown,
counting zero as Sunday.
If the value is negative, the current day of the week is used.
.TP 5
.B int \fImonth
is the initial month of the year shown,
counting one as January.
If the value is negative, the current month of the year is used.
.TP 5
.B int \fIyear
is the initial year shown.
If the value is negative, the current year is used.
.RE
.\" ************************************************************************
.IP \fBdialog_checklist
implements the "\fB--checklist\fP" and "\fB--radiolist\fP" options
depending on the \fIflag\fP parameter.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIlist_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of rows in \fIitems\fP.
.TP 5
.B int \fIitems
is an array of strings which is viewed either as a list of rows
.RS
\fItag item status \fR
.RE
.IP
or
.RS
\fItag item status help\fR
.RE
.IP
depending on whether \fBdialog_vars.item_help\fP is set.
.IP flag
is either \fIFLAG_CHECK\fP, for checklists,
or \fIFLAG_RADIO\fP for radiolists.
.RE
.\" ************************************************************************
.IP \fBdialog_dselect
implements the "\fB--dselect\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIpath
is the preselected value to show in the input-box,
which is used also to set the directory- and file-windows.
.TP 5
.B int \fIheight
is the height excluding the minimum needed to show the dialog box framework.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_editbox
implements the "\fB--editbox\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIfile
is the name of the file from which to read.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_form
implements the "\fB--form\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIform_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of rows in \fIitems\fP.
.TP 5
.B int \fIitems
is an array of strings which is viewed either as a list of rows
.RS
\fIName NameY NameX Text TextY TextX FLen ILen\fR
.RE
.IP
or
.RS
\fIName NameY NameX Text TextY TextX FLen ILen Help\fR
.RE
.IP
depending on whether \fBdialog_vars.item_help\fP is set.
.RE
.\" ************************************************************************
.IP \fBdialog_fselect
implements the "\fB--fselect\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIpath
is the preselected value to show in the input-box,
which is used also to set the directory- and file-windows.
.TP 5
.B int \fIheight
is the height excluding the minimum needed to show the dialog box framework.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_gauge
implements the "\fB--gauge\fP" option.
Alternatively, a simpler or customized gauge widget can be 
setup using
\fBdlg_allocate_gauge\fP,
\fBdlg_update_gauge\fP and
\fBdlg_free_gauge\fP.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIpercent
is the percentage to show in the progress bar.
.RE
.\" ************************************************************************
.IP \fBdialog_inputbox
implements the "\fB--inputbox\fP" or
"\fB--password\fP" option, depending on the value of \fIpassword\fP.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B const char * \fIinit
is the initial value of the input box, whose length is taken into account
when auto-sizing the width of the dialog box.
.TP 5
.B int \fIpassword
if true, causes typed input to be echoed as asterisks.
.RE
.\" ************************************************************************
.IP \fBdialog_helpfile
implements the "\fB--hfile\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIfile
is the name of a file containing the text to display.
This function is internally bound to F1 (function key "1"),
passing \fBdialog_vars.help_file\fP as a parameter.
The \fBdialog\fP program sets that variable when the \fB--hfile\fP option
is given.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_menu
implements the "\fB--menu\fP" or "\fB--inputmenu\fP" option
depending on whether \fBdialog_vars.input_menu\fP is set.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fImenu_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of rows in \fIitems\fP.
.TP 5
.B int \fIitems
is an array of strings which is viewed either as a list of rows
.RS
\fItag item\fR
.RE
.IP
or
.RS
\fItag item help\fR
.RE
.IP
depending on whether \fBdialog_vars.item_help\fP is set.
.RE
.\" ************************************************************************
.IP \fBdialog_mixedform
implements the "\fB--mixedform\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIform_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of rows in \fIitems\fP.
.TP 5
.B int \fIitems
is an array of strings which is viewed either as a list of rows
.RS
\fIName NameY NameX Text TextY TextX FLen ILen Ityp\fR
.RE
.IP
or
.RS
\fIName NameY NameX Text TextY TextX FLen ILen Ityp Help\fR
.RE
.IP
depending on whether \fBdialog_vars.item_help\fP is set.
.RE
.\" ************************************************************************
.IP \fBdialog_mixedgauge
implements the "\fB--mixedgauge\fP" option
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the caption text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIpercent
is the percentage to show in the progress bar.
.TP 5
.B int \fIitem_no
is the number of rows in \fIitems\fP.
.TP 5
.B int \fIitems
is an array of strings which is viewed as a list of \fItag\fP and \fIitem\fP values.
The \fItag\fP values are listed, one per row, in the list at the top of
the widget.
.IP
The \fIitem\fP values are decoded: digits 0-9 are the following strings
.RS
.IP 0
Succeeded
.IP 1
Failed
.IP 2
Passed
.IP 3
Completed
.IP 4
Checked
.IP 5
Done
.IP 6
Skipped
.IP 7
In Progress
.IP 8
(blank)
.IP 9
N/A
.RE
.IP
A string with a leading "-" character is centered, marked with "%".
For example, "-75" is displayed as "75%".
Other strings are displayed as is.
.RE
.\" ************************************************************************
.IP \fBdialog_msgbox
implements the "\fB--msgbox\fP" or "\fB--infobox\fP" option
depending on whether \fIpauseopt\fP is set.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIpauseopt
if true, an "OK" button will be shown,
and the dialog will wait for it to complete.
With an "OK" button, it is denoted a "msgbox",
without an "OK" button, it is denoted an "infobox".
.RE
.\" ************************************************************************
.IP \fBdialog_pause
implements the "\fB--pause\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIseconds
is the timeout to use for the progress bar.
.RE
.\" ************************************************************************
.IP \fBdialog_prgbox
implements the "\fB--prgbox\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
If empty or null, no prompt is shown.
.TP 5
.B const char * \fIcommand
is the name of the command to execute.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIpauseopt
if true, an "OK" button will be shown,
and the dialog will wait for it to complete.
.RE
.\" ************************************************************************
.IP \fBdialog_progressbox
implements the "\fB--progressbox\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
If empty or null, no prompt is shown.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_tailbox
implements the "\fB--tailbox\fP" or "\fB--tailboxbg\fP" option
depending on whether \fIbg_task\fP is set.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIfile
is the name of the file to display in the dialog.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIbg_task
if true,
the window is added to the callback list in \fBdialog_state\fP,
and the application will poll for the window to be updated.
Otherwise an "OK" button is added to the window,
and it will be closed when the button is activated.
.RE
.\" ************************************************************************
.IP \fBdialog_textbox
implements the "\fB--textbox\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIfile
is the name of the file to display in the dialog.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.\" ************************************************************************
.IP \fBdialog_timebox
implements the "\fB--timebox\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIsubtitle
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIhour
is the initial hour shown.
If the value is negative, the current hour is used.
Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 24.
.TP 5
.B int \fIminute
is the initial minute shown.
If the value is negative, the current minute is used.
Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 60.
.TP 5
.B int \fIsecond
is the initial second shown.
If the value is negative, the current second is used.
Returns DLG_EXIT_ERROR if the value specified is greater than or equal to 60.
.RE
.\" ************************************************************************
.IP \fBdialog_yesno
implements the "\fB--yesno\fP" option.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.RE
.
.\" ************************************************************************
.SH UTILITY FUNCTIONS
Most functions that implement lower-level
functionality for the command-line \fB\*p\fP
program or widgets, have names beginning "\fIdlg_\fP".
Bowing to longstanding usage, the functions that initialize the
display and end it are named \fIinit_dialog\fP and \fIend_dialog\fP.
.PP
The only non-widget function whose name begins with "\fIdialog_\fP"
is \fBdialog_version\fP, which returns the version number of the
library as a string.
.
.PP
Here is a brief summary of the utility functions and their parameters:
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_callback
Add a callback, used to allow polling input from multiple tailbox
widgets.
.RS
.TP 5
.B DIALOG_CALLBACK *\fIp\fP
contains the callback information.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_callback_ref
Like \fBdlg_add_callback\fP, but passes a reference to the \fBDIALOG_CALLBACK\fP
as well as a pointer to a cleanup function which will be called when the
associated input ends.
.RS
.TP 5
.B DIALOG_CALLBACK **\fIp\fP
points to the callback information.
This is a reference to the pointer so that the caller's pointer can be
zeroed when input ends.
.TP 5
.B DIALOG_FREEBACK \fIfunc\fP
function to call when input ends, e.g., to free caller's additional data.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_quoted
Add a quoted string to the result buffer (see \fBdlg_add_result\fP).
If no quotes are necessary, none are used.
If \fBdialog_vars.single_quoted\fR is set, single-quotes are used.
Otherwise, double-quotes are used.
.RS
.TP 5
.B char * \fIstring
is the string to add.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_result
Add a string to the result buffer \fBdialog_vars.input_result\fP.
.RS
.TP 5
.B char * \fIstring
is the string to add.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_separator
Add an output-separator to the result buffer \fBdialog_vars.input_result\fP.
If \fBdialog_vars.output_separator\fP is set, use that.
Otherwise, if \fBdialog_vars.separate_output\fP is set, use newline. 
If neither is set, use a space.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_add_string
Add a quoted or unquoted string to the result buffer
(see \fBdlg_add_quoted\fP) and \fBdlg_add_result\fP),
according to whether \fBdialog_vars.quoted\fP is true.
.RS
.TP 5
.B char * \fIstring
is the string to add.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_align_columns
Copy and reformat an array of pointers to strings, aligning according to
the column separator \fBdialog_vars.column_separator\fP.
If no column separator is set, the array will be unmodified;
otherwise it is copied and reformatted.
.IP
Caveat: This function is only implemented for 8-bit characters.
.RS
.TP 5
.B char **\fItarget
This is the array to reformat.
It points to the first string to modify.
.TP 5
.B int \fIper_row
This is the size of the struct for each row of the array.
.TP 5
.B int \fInum_rows
This is the number of rows in the array.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_allocate_gauge
Allocates a gauge widget.
Use \fBdlg_update_gauge\fP to display the result.
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIpercent
is the percentage to show in the progress bar.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_asciibox
returns its parameter transformed to the
corresponding "+" or "-", etc. for the line-drawing characters used in \fB\*p\fP.
If the parameter is not a line-drawing or other special character such as ACS_DARROW, it returns 0.
.RS
.TP 5
.B chtype \fIch
is the parameter, usually one of the \fBACS_\fP\fIxxx\fP constants.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_attr_clear
Set window to the given attribute.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B int \fIheight
is the number of rows to update.
.TP 5
.B int \fIwidth
is the number of columns to update.
.TP 5
.B chtype \fIattr
is the attribute, e.g., \fBA_BOLD\fP.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_auto_size
Automatically size the window used for a widget.
If the given height or width are zero,
justify the \fIprompt\fP text and return the actual limits.
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIprompt
is the message text which will be displayed in the widget,
used here to determine how large the widget should be.
.TP 5
.B int * \fIheight
is the nominal height.
.TP 5
.B int * \fIwidth
is the nominal width.
.TP 5
.B int \fIboxlines
is the number of lines to reserve in the vertical direction.
.TP 5
.B int \fImincols
is the minimum number of columns to use.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_auto_sizefile
Like \fBdlg_auto_size\fP, but use a file contents to decide how large
the widget should be.
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIfile
is the name of the file.
.TP 5
.B int * \fIheight
is the nominal height.
If it is -1, use the screen's height (after subtracting \fBdialog_vars.begin_y\fP
if \fBdialog_vars.begin_set\fP is true).
.TP 5
.B int * \fIwidth
is the nominal width.
If it is -1, use the screen's width (after subtracting \fBdialog_vars.begin_x\fP
if \fBdialog_vars.begin_set\fP is true).
.TP 5
.B int \fIboxlines
is the number of lines to reserve on the screen for drawing boxes.
.TP 5
.B int \fImincols
is the number of columns to reserve on the screen for drawing boxes.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_beeping
If \fBdialog_vars.beep_signal\fP is nonzero,
this calls \fBbeep\fP once and sets
\fBdialog_vars.beep_signal\fP to zero.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_boxchar
returns its \fBchtype\fP parameter transformed as follows:
.RS
.TP 3
.B -
if neither \fBdialog_vars.ascii_lines\fP nor \fBdialog_vars.no_lines\fP is set.
.TP 3
.B -
if \fBdialog_vars.ascii_lines\fP is set, returns the corresponding "+" or "-", etc. for the line-drawing characters used in \fB\*p\fP.
.TP 3
.B -
otherwise, if \fBdialog_vars.no_lines\fP is set, returns a space for the line-drawing characters.
.TP 3
.B -
if the parameter is not a line-drawing or other special character such as ACS_DARROW, it returns the parameter unchanged.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_box_x_ordinate
returns a suitable x-ordinate (column) for a new widget.
If \fBdialog_vars.begin_set\fP is 1,
use \fBdialog_vars.begin_x\fP;
otherwise center the widget on the screen (using the \fIwidth\fP parameter).
.RS
.TP 5
.B int \fIwidth
is the width of the widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_box_y_ordinate
returns a suitable y-ordinate (row) for a new widget.
If \fBdialog_vars.begin_set\fP is 1,
use \fBdialog_vars.begin_y\fP;
otherwise center the widget on the screen (using the \fIheight\fP parameter).
.RS
.TP 5
.B int \fIheight
is the height of the widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_button_count
Count the buttons in the list.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_button_layout
Make sure there is enough space for the buttons by
computing the width required for their labels,
adding margins and limiting based on the screen size.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int * \fIlimit
the function sets the referenced \fIlimit\fP to the width required for
the buttons (limited by the screen size)
if that is wider than the passed-in limit.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_button_sizes
Compute the size of the button array in columns.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int \fIvertical
is true if the buttons are arranged in a column rather than a row.
.TP 5
.B int * \fIlongest
Return the total number of columns in the referenced location.
.TP 5
.B int * \fIlength
Return the longest button's columns in the referenced location.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_button_x_step
Compute the step-size needed between elements of the button array.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int \fIlimit
is the maximum number of columns to allow for the buttons.
.TP 5
.B int * \fIgap
store the nominal gap between buttons in the referenced location.
This is constrained to be at least one.
.TP 5
.B int * \fImargin
store the left+right total margins (for the list of buttons) in the referenced
location.
.TP 5
.B int * \fIstep
store the step-size in the referenced location.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_button_to_char
Find the first uppercase character in the label, which we may use for an
abbreviation.
If the label is empty, return -1.
If no uppercase character is found, return 0.
Otherwise return the uppercase character.
.RS
.TP 5
.B const char * \fIlabel
is the label to test.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_calc_list_width
Calculate the minimum width for the list, assuming none of the items
are truncated.
.RS
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP.
.TP 5
.B DIALOG_LISTITEM * \fIitems
contains a \fIname\fP and \fItext\fP field,
e.g., for checklists or radiobox lists.
The function returns the sum of the widest columns
needed for of each of these fields.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_calc_listh
Calculate new height and list_height values.
.RS
.TP 5
.B int * \fIheight
on input, is the height without adding the list-height.
On return, this contains the total list-height and is the
actual widget's height.
.TP 5
.B int * \fIlist_height
on input, is the requested list-height.
On return, this contains the number of rows available for displaying
the list after taking into account the screen size and
the \fBdialog_vars.begin_set\fP and \fBdialog_vars.begin_y\fP variables.
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP in the list.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_calc_listw
This function is obsolete, provided for library-compatibility.
It is replaced by \fBdlg_calc_list_width\fP.
.RS
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP.
.TP 5
.B char ** \fIitems
is a list of character pointers.
.TP 5
.B int \fIgroup
is the number of items in each group, e.g., the second array index.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_char_to_button
Given a list of button labels,
and a character which may be the abbreviation for one, find it, if it exists.
An abbreviation will be the first character
which happens to be capitalized in the label.
If the character is found, return its index within the list of \fIlabels\fP.
Otherwise, return \fBDLG_EXIT_UNKNOWN\fP.
.RS
.TP 5
.B int \fIch
is the character to find.
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_checklist
This entrypoint provides the \fB--checklist\fP or \fP--radiolist\fP
functionality without the limitations of \fB\*p\fP's command-line syntax
(compare to \fBdialog_checklist\fP).
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIlist_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP.
.TP 5
.B DIALOG_LISTITEM * \fIitems
This is a list of the items to display in the checklist.
.TP 5
.B const char * \fIstates
This is a list of characters to display for the given states.
Normally a checklist provides true (1) and false (0) values,
which the widget displays as "*" and space, respectively.
An application may set this parameter to an arbitrary null-terminated string.
The widget determines the number of states from the length of this string,
and will cycle through the corresponding display characters as the user
presses the space-bar.
.TP 5
.B int \fIflag
This is should be one of \fBFLAG_CHECK\fP or \fPFLAG_RADIO\fP,
depending on whether the widget should act as a checklist or radiobox.
.TP 5
.B int * \fIcurrent_item
The widget sets the referenced location to the index of the current display
item (cursor) when it returns.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_check_scrolled
given a function key (or other key that was mapped to a function key),
check if it is one of the up/down scrolling functions:
.sp
.RS
	DLGK_PAGE_FIRST,
.br
	DLGK_PAGE_LAST,
.br
	DLGK_GRID_UP,
.br
	DLGK_GRID_DOWN,
.br
	DLGK_PAGE_PREV or
.br
	DLGK_PAGE_NEXT.
.RE
.fi
.IP
Some widgets use these key bindings for scrolling the prompt-text up and
down, to allow for display in very small windows.
.IP
The function returns 0 (zero) if it finds one of these keys,
and -1 if not.
.RS
.TP 5
.B int \fIkey
is the function-key to check
.TP 5
.B int \fIlast
is the number of lines
which would be used to display the scrolled prompt in
an arbitrarily tall window.
It is used here to check limits for the \fIoffset\fP value.
.TP 5
.B int \fIpage
this is the available height for writing scrolled text,
which is smaller than the window if it contains buttons.
.TP 5
.B bool * \fIshow
on return, holds TRUE if \fBdlg_print_scrolled\fP should be used to redisplay
the prompt text.
.TP 5
.B int * \fIoffset
on entry, holds the starting line number (counting from zero)
last used for \fBdlg_print_scrolled\fP.
On return, holds the updated starting line number.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_clear
Set window to the default \fB\*p\fP screen attribute.
This is set in the rc-file with \fBscreen_color\fP.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_clr_result
Free storage used for the result buffer (\fBdialog_vars.input_result\fP).
The corresponding pointer is set to NULL.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_color_count
Return the number of colors that can be configured in \fB\*p\fP.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_color_setup
Initialize the color pairs used in \fB\*p\fP.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_count_argv
Count the entries in an argument vector.
.RS
.TP 5
.B argv
Points to the argument vector.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_count_columns
Returns the number of columns used for a string.
This is not necessarily the number of bytes in a string.
.RS
.TP 5
.B const char * \fIstring
is the string to measure.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_count_real_columns
Returns the number of columns used for a string,
accounting for "\\Z" sequences which can be used for
coloring the text if \fBdialog_vars.colors\fP is set.
This is not necessarily the number of bytes in a string.
.RS
.TP 5
.B const char * \fIstring
is the string to measure.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_count_wchars
Returns the number of wide-characters in the string.
.RS
.TP 5
.B const char * \fIstring
is the string to measure.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_create_rc
Create a configuration file,
i.e., write internal tables to a file which can be read back by \fB\*p\fP
as an rc-file.
.RS
.TP 5
.B const char * \fIfilename
is the name of the file to write to.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_ctl_size
If \fBdialog_vars.size_err\fP is true,
check if the given window size is too large to fit on the screen.
If so, exit with an error reporting the size of the window.
.RS
.TP 5
.B int \fIheight
is the window's height
.TP 5
.B int \fIwidth
is the window's width
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_default_button
If \fBdialog_vars.default_button\fP is positive,
return the button-index for that button code,
using \fBdlg_ok_buttoncode\fP to test indices starting with zero.
Otherwise (or if no match was found for the button code), return zero.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_default_formitem
If \fBdialog_vars.default_item\fP is not null,
find that name by matching the \fIname\fP field in the list of form \fIitems\fP.
If found, return the index of that item in the list.
Otherwise, return zero.
.RS
.TP 5
.B DIALOG_FORMITEM * \fIitems
is the list of items to search.
It is terminated by an entry with a null \fIname\fP field.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_default_item
This function is obsolete, provided for library-compatibility.
It is replaced by \fBdlg_default_formitem\fP and \fBdlg_default_listitem\fP.
.RS
.TP 5
.B char ** \fIitems
is the list of items to search.
.TP 5
.B int \fIllen
is the number of items in each group, e.g., the second array index.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_defaultno_button
If \fBdialog_vars.defaultno\fP is true, and \fBdialog_vars.nocancel\fP is not,
find the button-index for the "Cancel" button.
Otherwise, return the index for "OK" (always zero).
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_del_window
Remove a window, repainting everything else.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to remove.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_does_output
This is called each time a widget is invoked which may do output.
It increments \fBdialog_state.output_count\fP,
so the output function in \fB\*p\fP can test this and add a separator.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_arrows
Draw up/down arrows on a window, e.g., for scrollable lists.
It calls \fBdlg_draw_arrows2\fP using the
\fImenubox_color\fP and \fImenubox_border_color\fP attributes.
.RS
.TP 5
.B WINDOW * \fIdialog
is the window on which to draw an arrow.
.TP 5
.B int \fItop_arrow
is true if an up-arrow should be drawn at the top of the window.
.TP 5
.B int \fIbottom_arrow
is true if an down-arrow should be drawn at the bottom of the window.
.TP 5
.B int \fIx
is the zero-based column within the window on which to draw arrows.
.TP 5
.B int \fItop
is the zero-based row within the window on which to draw up-arrows
as well as a horizontal line to show the window's top.
.TP 5
.B int \fIbottom
is the zero-based row within the window on which to draw down-arrows
as well as a horizontal line to show the window's bottom.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_arrows2
Draw up/down arrows on a window, e.g., for scrollable lists.
.RS
.TP 5
.B WINDOW * \fIdialog
is the window on which to draw an arrow.
.TP 5
.B int \fItop_arrow
is true if an up-arrow should be drawn at the top of the window.
.TP 5
.B int \fIbottom_arrow
is true if an down-arrow should be drawn at the bottom of the window.
.TP 5
.B int \fIx
is the zero-based column within the window on which to draw arrows.
.TP 5
.B int \fItop
is the zero-based row within the window on which to draw up-arrows
as well as a horizontal line to show the window's top.
.TP 5
.B int \fIbottom
is the zero-based row within the window on which to draw down-arrows
as well as a horizontal line to show the window's bottom.
.TP 5
.B chtype \fIattr
is the window's background attribute.
.TP 5
.B chtype \fIborderattr
is the window's border attribute.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_bottom_box
Draw a partial box at the bottom of a window,
e.g., to surround a row of buttons.
It is designed to merge with an existing box around
the whole window (see \fBdlg_draw_box\fP),
so it uses tee-elements rather than corner-elements
on the top corners of this box.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_bottom_box2
Draw a partial box at the bottom of a window,
e.g., to surround a row of buttons.
It is designed to merge with an existing box around
the whole window (see \fBdlg_draw_box2\fP),
so it uses tee-elements rather than corner-elements
on the top corners of this box.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.B chtype \fIon_left
is used to color the upper/left edges of the box, i.e., the tee-element and
horizontal line
.B chtype \fIon_right
is used to color the right edge of the box, i.e., the tee-element
.B chtype \fIon_inside
is used to fill-color the inside of the box
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_box
Draw a rectangular box with line drawing characters.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B int \fIy
is the top row of the box.
.TP 5
.B int \fIx
is the left column of the box.
.TP 5
.B int \fIheight
is the height of the box.
.TP 5
.B int \fIwidth
is the width of the box.
.TP 5
.B chtype \fIboxchar
is used to color the right/lower edges.
It also is fill-color used for the box contents.
.TP 5
.B chtype \fIborderchar
is used to color the upper/left edges.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_box2
Draw a rectangular box with line drawing characters.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B int \fIy
is the top row of the box.
.TP 5
.B int \fIx
is the left column of the box.
.TP 5
.B int \fIheight
is the height of the box.
.TP 5
.B int \fIwidth
is the width of the box.
.TP 5
.B chtype \fIboxchar
is used to fill-color for the box contents.
.TP 5
.B chtype \fIborderchar
is used to color the upper/left edges.
.TP 5
.B chtype \fIborderchar2
is used to color the right/lower edges.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_buttons
Print a list of buttons at the given position.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B int \fIy
is the starting row.
.TP 5
.B int \fIx
is the starting column.
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int \fIselected
is the index within the list of the selected button.
.TP 5
.B int \fIvertical
is true if the buttons are arranged in a column rather than a row.
.TP 5
.B int \fIlimit
is the number of columns (or rows if \fIvertical\fP) allowed for the display.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_helpline
draw the text in \fBdialog_vars.help_line\fP at the bottom of the given window.
.RS
.TP 5
.B WINDOW * \fIdialog
is the window to modify.
.TP 5
.B bool \fIdecorations
if true, allow room for the scrolling arrows.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_scrollbar
If \fBdialog_state.use_scrollbar\fP is set,
draw a scrollbar on the right margin of windows holding scrollable data.
Also (whether or not the scrollbar is drawn),
annotate the bottom margin of the window with the percentage of data
by the bottom of that window,
and call \fBdlg_draw_arrows2\fP to put markers on the window showing
when more data is available.
.RS
.TP 5
.B WINDOW * \fIwin
is the window in which the data is scrolled.
Because \fIleft\fP, \fIright\fP, \fItop\fP, \fIbottom\fP
are passed as parameters, this window can contain additional data.
.TP 5
.B long \fIfirst_data
is the zero-based index to the first row of data in the current window.
.TP 5
.B long \fIthis_data
is the zero-based index to the current row of data.
.TP 5
.B long \fInext_data
is the zero-based index to the next data after the current row.
.TP 5
.B long \fItotal_data
is the total number of rows of data.
.TP 5
.B int \fIleft
is the zero-based left margin/column of the window.
The up/down arrows are draw inset by 5 columns from this point.
.TP 5
.B int \fIright
is the zero-based right margin/column of the window.
The scrollbar is drawn flush against this column.
.TP 5
.B int \fItop
is the zero-based row within the window on which to draw up-arrows
as well as a horizontal line to show the window's top.
.TP 5
.B int \fIbottom
is the zero-based row within the window on which to draw down-arrows
as well as a horizontal line to show the window's bottom.
.TP 5
.B chtype \fIattr
is the window's background attribute.
.TP 5
.B chtype \fIborderattr
is the window's border attribute.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_shadow
Draw shadows along the right and bottom edge of a window to give it
a 3-dimensional look.
(The height, etc., may not be the same as the window's actual values).
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B int \fIheight
is the height of the window.
.TP 5
.B int \fIwidth
is the width of the window.
.TP 5
.B int \fIy
is the top row of the window.
.TP 5
.B int \fIx
is the left column of the window.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_draw_title
Draw a title centered at the top of the window.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_dummy_menutext
This is a utility function which supports the \fB--inputmenu\fP option of
the \fB\*p\fP program.
If \fBdialog_vars.input_menu\fP is set, \fBdialog_menu\fP passes this
pointer to \fBdlg_menu\fP as the \fIrename_menutext\fP parameter.
Otherwise, it passes \fBdlg_dummy_menutext\fP.
.IP
The function should only return \fBDLG_EXIT_ERROR\fP.
.RS
.TP 5
.B DIALOG_LISTITEM * \fIitems
is the list of menu items
.TP 5
.B int \fIcurrent
is the index of the currently-selected item
.TP 5
.B char * \fInewtext
is the updated text for the menu item
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_dump_keys
Write all user-defined key-bindings to the given stream,
e.g., as part of \fBdlg_create_rc\fP.
.RS
.TP 5
.B FILE * \fIfp
is the stream on which to write the bindings.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_dump_window_keys
Write all user-defined key-bindings to the given stream,
e.g., as part of \fBdlg_create_rc\fP.
.RS
.TP 5
.B FILE * \fIfp
is the stream on which to write the bindings.
.TP 5
.B WINDOW * \fIwin
is the window for which bindings should be dumped.
If it is null, then only built-in bindings are dumped.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_eat_argv
Remove one or more items from an argument vector.
.RS
.TP 5
.B int *argcp
in/out parameter giving the length of the argument vector.
.B char ***argvp
in/out parameter pointing to the argument vector.
.B int start
starting index.
.B int count
number of arguments to remove.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_edit_offset
Given the character-offset in the string,
returns the display-offset where
\fB\*p\fP should position the cursor.
In this context, "characters" may be multicolumn,
since the string can be a multibyte character string.
.RS
.TP 5
.B char * \fIstring
is the string to analyze
.TP 5
.B int \fIoffset
is the character-offset
.TP 5
.B int \fIx_last
is a limit on the column positions that can be used,
e.g., the window's size.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_edit_string
Updates the string and character-offset, given various editing characters
or literal characters which are inserted at the character-offset.
Returns true if an editing change was made (and the display should
be updated), and false if the key was something like KEY_ENTER,
which is a non-editing action outside this function.
.RS
.TP 5
.B char * \fIstring
is the (multibyte) string to update
.TP 5
.B int * \fIoffset
is the character-offset
.TP 5
.B int \fIkey
is the editing key
.TP 5
.B int \fIfkey
is true if the editing key is a function-key
.TP 5
.B bool \fIforce
is used in a special loop case by calling code to force the return
value of this function when a function-key code 0 is passed in.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_exit
Given an internal exit code,
check if the corresponding environment variable is set.
If so, remap the exit code to match the environment variable.
Finally call \fBexit\fP with the resulting exit code.
.RS
.TP 5
.B int \fIcode
is the internal exit code, e.g., \fBDLG_EXIT_OK\fP,
which may be remapped.
.RE
.IP
The \fB\*p\fP program uses this function
to allow shell scripts to remap the exit codes so they can distinguish ESC
from ERROR.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_exit_buttoncode
Map the given button index for \fBdlg_exit_label\fP into \fB\*p\fP's exit-code.
.RS
.TP 5
.B int \fIbutton
is the button index
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_exit_label
Return a list of button labels.
If dialog_var.extra_button is true, return the result of \fBdlg_ok_labels\fP.
Otherwise, return a list with the "Exit" label and (if \fBdialog_vars.help_button\fP
is set) the "Help" button as well.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_exiterr
Quit program killing all \fBtailboxbg\fP widgets.
.RS
.TP 5
.B const char * \fIfmt
is the format of the \fBprintf\fP-like message to write.
.TP 5
.B ...
.br
are the variables to apply to the \fIfmt\fP format.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_find_index
Given the character-offset to find in the list, return the corresponding
array index.
.RS
.TP 5
.B const int *\fIlist
contains a list of character-offsets,
i.e., indices into a string that denote the beginning of multibyte characters.
.TP 5
.B int \fIlimit
is the last index into \fBlist\fP to search.
.TP 5
.B int \fIto_find
is the character-offset to find.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_flush_getc
Cancel the local data saved by \fBdlg_last_getc\fP.
.\" ---------------------------------------------------------------------------
.IP dlg_editbox
This entrypoint provides the \fB--editbox\fP
functionality without the limitations of \fB\*p\fP's command-line syntax
(compare to \fBdialog_editbox\fP).
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B char *** \fIlist
is a pointer to an array of \fBchar\ *\fP pointers.
The array is allocated by the caller,
and so are the strings to which it points.
The \fBdlg_editbox\fP function may reallocate the
array and the strings.
.TP 5
.B int * \fIrows
points to the nominal length of \fIlist\fP.
The referenced value is updated if\fIlist\fP is reallocated.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_form
This entrypoint provides the \fB--form\fP
functionality without the limitations of \fB\*p\fP's command-line syntax
(compare to \fBdialog_form\fP).
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIform_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP.
.TP 5
.B DIALOG_FORMITEM * \fIitems
This is a list of the items to display in the form.
.TP 5
.B int * \fIcurrent_item
The widget sets the referenced location to the index of the current display
item (cursor) when it returns.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_free_columns
Free data allocated by \fBdlg_align_columns\fP.
.RS
.TP 5
.B char **\fItarget
This is the array which was reformatted.
It points to the first string to free.
.TP 5
.B int \fIper_row
This is the size of the struct for each row of the array.
.TP 5
.B int \fInum_rows
This is the number of rows in the array.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_free_formitems
Free memory owned by a list of DIALOG_FORMITEM's.
.RS
.TP 5
.B DIALOG_FORMITEM * \fIitems
is the list to free.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_free_gauge
Remove the gauge widget from the screen and free its associated memory.
.RS
.TP 5
.B void *\fIobjptr
points to the gauge widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_getc
Read a character from the given window.
Handle repainting here (to simplify
things in the calling application).
Also, if input-callback(s) are set up,
poll the corresponding files and handle the updates,
e.g., for displaying a tailbox.
Returns the key-code.
.RS
.TP 5
.B WINDOW * \fIwin
is the window within which to read.
.TP 5
.B int * \fIfkey
as a side-effect, set this to true if the key-code is really a function-key.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_get_attrs
extract the video attributes from the given window.
.RS
.TP 5
.B WINDOW * \fIwin
is the window from which to get attributes.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_getc_callbacks
passes the given key-code \fIch\fP to the current window that
has established a callback.
If the callback returns zero, remove it and try the next window.
If no more callbacks remain, return.
If any callbacks were found, return true, otherwise false.
.RS
.TP 5
.B int \fIch
is the key-code
.TP 5
.B int \fIfkey
is true if the key is a function-key
.TP 5
.B int * \fIresult
is used to pass an exit-code to the caller,
which should pass that via \fBdlg_exit\fP.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_index_columns
Build a list of the display-columns for the given multibyte string's characters.
.RS
.TP 5
.B const char * \fIstring
is the string to analyze
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_index_wchars
Build an index of the wide-characters in the string,
so the caller can easily tell
which byte-offset begins a given wide-character.
.RS
.TP 5
.B const char * \fIstring
is the string to analyze
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_item_help
Draw the string for the \fBdialog_vars.item_help\fP feature.
.RS
.TP 5
.B const char * \fItxt
is the help-message
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_killall_bg
If \fB\*p\fP has callbacks active,
purge the list of all that are not marked
to keep in the background.
If any remain, run those in a background process.
.RS
.TP 5
.B int * \fIretval
stores the exit-code to pass back to the caller.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_last_getc
returns the most recent character that was read via \fBdlg_getc\fP.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_limit_columns
Given a column limit,
count the number of wide characters that can fit into that limit.
The offset is used to skip over a leading character
that was already written.
.RS
.TP 5
.B const char * \fIstring
is the string to analyze
.TP 5
.B int \fIlimit
is the column limit
.TP 5
.B int \fIoffset
is the starting offset from which analysis should continue
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_lookup_key
Check for a key-binding.
If there is no binding associated with the widget, it simply returns
the given curses-key.
Otherwise, it returns the result of the binding
.RS
.TP 5
.B WINDOW * \fIwin
is the window on which the binding is checked
.TP 5
.B int \fIcurses_key
is the curses key-code
.TP 5
.B int * \fIdialog_key
is the corresponding \fB\*p\fP internal code
(see \fBDLG_KEYS_ENUM\fP in dlg_key.h).
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_max_input
Limit the parameter according to \fBdialog_vars.max_input\fP
.RS
.TP 5
.B int \fImax_len
is the value to limit
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_match_char
Match a given character against the beginning of the string,
ignoring case of the given character.
The matching string must begin with an uppercase character.
.RS
.TP 5
.B int \fIch
is the character to check
.TP 5
.B const char * \fIstring
is the string to search
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_menu
This entrypoint provides the \fB--menu\fP
functionality without the limitations of \fB\*p\fP's command-line syntax
(compare to \fBdialog_menu\fP).
.RS
.TP 5
.B const char * \fItitle
is the title string to display at the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is adjusted to use the available screen size.
.TP 5
.B int \fImenu_height
is the minimum height to reserve for displaying the list.
If zero, it is computed based on the given \fIheight\fP and \fIwidth\fP.
.TP 5
.B int \fIitem_no
is the number of \fIitems\fP.
.TP 5
.B DIALOG_LISTITEM * \fIitems
This is a list of the items to display in the form.
.TP 5
.B int * \fIcurrent_item
The widget sets the referenced location to the index of the current display
item (cursor) when it returns.
.TP 5
.B DIALOG_INPUTMENU \fIrename_menutext
If this is not \fBdlg_dummy_menutext\fP,
the widget acts like an \fIinputmenu\fP widget,
providing an extra "Rename" button,
which activates an edit feature on the selected menu item.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_move_window
Moves/resizes the given window to the given position and size.
.RS
.TP 5
.B WINDOW *\fIwin
is the window to move/resize.
.TP 5
.B WINDOW *\fIheight
is the height of the resized window.
.TP 5
.B WINDOW *\fIwidth
is the width of the resized window.
.TP 5
.B WINDOW *\fIy
y-ordinate to use for the repositioned window.
.TP 5
.B WINDOW *\fIx
x-ordinate to use for the repositioned window.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_bigregion
Retrieve the big-region under the pointer.
.RS
.TP 5
.B int \fIy
is the row on which the mouse click occurred
.TP 5
.B int \fIx
is the column on which the mouse click occurred
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_free_regions
Free the memory associated with mouse regions.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_mkbigregion
Creates a region on which the mouse-clicks will return a specifed code.
.RS
.TP 5
.B int \fIy
is the top-row of the region.
.TP 5
.B int \fIx
is the left-column of the region.
.TP 5
.B int \fIheight
is the height of the region.
.TP 5
.B int \fIwidth
is the width of the region.
.TP 5
.B int \fIcode
is a code used to make the region unique within a widget
.TP 5
.B int \fIstep_x
is used in modes 2 (columns) and 3 (cells) to determine the width
of a column/cell.
.TP 5
.B int \fIstep_y
is currently unused
.TP 5
.B int \fImode
is used to determine how the mouse position is translated into
a code (like a function-key):
.RS
.TP
1
index by lines
.TP
2
index by columns
.TP
3
index by cells
.RE
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_mkregion
.RS
.TP 5
.B int \fIy
is the top-row of the region.
.TP 5
.B int \fIx
is the left-column of the region.
.TP 5
.B int \fIheight
is the height of the region.
.TP 5
.B int \fIwidth
is the width of the region.
.TP 5
.B int \fIcode
is a code used to make the region unique within a widget
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_region
Retrieve the frame under the mouse pointer
.RS
.TP 5
.B int \fIy
is the row of the mouse-click
.TP 5
.B int \fIx
is the column of the mouse-click
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_setbase
Sets a base for subsequent calls to \fBdlg_mouse_mkregion\fP,
so they can make regions relative to the start of a given window.
.RS
.TP 5
.B int \fIx
is the left-column for the base
.TP 5
.B int \fIy
is the top-row for the base
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_wgetch
is a wrapper for \fBdlg_getc\fP which additionally maps mouse-clicks
(if the curses library supports those) into extended function-keys
which encode the position according to the \fImode\fP in
\fBdlg_mouse_mkbigregion\fP.
Returns the corresponding key-code.
.RS
.TP 5
.B WINDOW * \fIwin
is the window on which to perform the input
.TP 5
.B int * \fIfkey
the referenced location is set to true if the key-code is an actual
or extended (mouse) function-key.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_mouse_wgetch_nowait
This is a non-blocking variant of \fBdlg_mouse_wgetch\fP.
.RS
.TP 5
.B WINDOW * \fIwin
is the window on which to perform the input
.TP 5
.B int * \fIfkey
the referenced location is set to true if the key-code is an actual
or extended (mouse) function-key.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_need_separator
Check if an output-separator is needed.
If \fBdialog_vars.output_separator\fP is set, return true.
Otherwise, if \fBdialog_vars.input_result\fP is nonempty, return true.
If neither, return false.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_new_modal_window
Create a modal window, optionally with a shadow.
The shadow is created if \fBdialog_state.use_shadow\fP is true.
.RS
.TP 5
.B WINDOW * \fIparent
is the parent window (usually the top-level window of a widget)
.TP 5
.B int \fIheight
is the window's height
.TP 5
.B int \fIwidth
is the window's width
.TP 5
.B int \fIy
is the window's top-row
.TP 5
.B int \fIx
is the window's left-column
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_new_window
Create a window, optionally with a shadow.
The shadow is created if \fBdialog_state.use_shadow\fP is true.
.RS
.TP 5
.B int \fIheight
is the window's height
.TP 5
.B int \fIwidth
is the window's width
.TP 5
.B int \fIy
is the window's top-row
.TP 5
.B int \fIx
is the window's left-column
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_next_button
Return the next index in the list of labels.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int \fIbutton
is the current button-index.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_next_ok_buttonindex
Assuming that the caller is using \fBdlg_ok_labels\fP to list buttons,
find the next index in the list of buttons.
.RS
.TP 5
.B int \fIcurrent
is the current index in the list of buttons
.TP 5
.B int \fIextra
if negative, provides a way to enumerate extra active areas on the widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_ok_buttoncode
Map the given button index for \fBdlg_ok_labels\fP
into \fB\*p\fP's exit-code.
.RS
.TP 5
.B int \fIbutton
is the button-index (which is not necessarily the same as the index
in the list of labels).
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_ok_label
Returns a list with the "Ok" label,
and if \fBdialog_vars.help_button\fP is true, the "Help" label as well.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_ok_labels
Return a list of button labels for the OK/Cancel group of widgets.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_ordinate
Decode the string as an integer, decrement if greater than zero to make
a curses-ordinate from a dialog-ordinate.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_parse_bindkey
Parse the parameters of the "bindkeys" configuration-file entry.  This
expects widget name which may be "*", followed by curses key definition and
then \fB\*p\fP key definition.
.RS
.TP 5
.B char * \fIparams
is the parameter string to parse.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_parse_rc
Parse the configuration file and set up variables.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_prev_button
Return the previous index in the list of labels.
.RS
.TP 5
.B const char ** \fIlabels
is a list of (pointers to) button labels terminated by a null pointer.
.TP 5
.B int \fIbutton
is the current button index
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_print_scrolled
This is a wrapper for \fBdlg_print_autowrap\fP which allows the user
to scroll too-long prompt text up/down.
.IP
See \fBdlg_check_scrolled\fP for a function which updates the \fIoffset\fP
variable used as a parameter here.
It complements this function; you need both.
If \fIpauseopt\fP is set, this function returns an updated \fIlast\fP
parameter, needed for \fBdlg_check_scrolled\fP calls.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B const char * \fIprompt
is the string to print
.TP 5
.B int \fIoffset
is the starting line-number to write wrapped text.
.TP 5
.B int \fIheight
is the available height for writing the wrapped text
.TP 5
.B int \fIwidth
is the width that the wrapping should occur in
.TP 5
.B int \fIpauseopt
is true if the extra functionality for scrolling should be enabled.
If false, this calls \fBdlg_print_autowrap\fP without doing any scrolling.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_print_line
Print one line of the prompt in the window within the limits of the
specified right margin.
The line will end on a word boundary and a pointer
to the start of the next line is returned, or a NULL pointer if the end of
*prompt is reached.
.RS
.TP 5
.B WINDOW *\fIwin
is the window to update.
.TP 5
.B chtype *\fIattr
holds the starting attributes, and is updated to reflect the final attributes
applied to the string.
.TP 5
.B const char *\fIprompt
is the string to print
.TP 5
.B int \fIlm
is the left margin.
.TP 5
.B int \fIrm
is the right margin
.TP 5
.B int *\fIx
returns the ending x-ordinate.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_prev_ok_buttonindex
Find the previous button index in the list from \fBdlg_ok_labels\fP.
.RS
.TP 5
.B int \fIcurrent
is the current index
.TP 5
.B int \fIextra
if negative provides a way to enumerate extra active areas on the widget.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_print_autowrap
Print a string of text in a window, automatically wrap around to the next
line if the string is too long to fit on one line.
Note that the string may contain embedded newlines.
The text is written starting at the top of the window.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B const char * \fIprompt
is the string to print
.TP 5
.B int \fIheight
is the nominal height the wrapped string is limited to
.TP 5
.B int \fIwidth
is the width that the wrapping should occur in
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_print_size
If \fBdialog_vars.print_siz\fP is true,
print the given height/width (from a widget)
to \fBdialog_state.output\fP, e.g.,
\fBSize: height, width\fP.
.RS
.TP 5
.B int \fIheight
is the window's height
.TP 5
.B int \fIwidth
is the window's width
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_print_text
Print up to \fIcols\fP columns from \fBtext\fP,
optionally rendering \fB\*p\fP's escape sequences for attributes and color.
.RS
.TP 5
.B WINDOW * \fIwin
is the window to update.
.TP 5
.B const char * \fItxt
is the string to print
.TP 5
.B int \fIcol
is the column limit
.TP 5
.B chtype * \fIattr
holds the starting attributes, and is updated to reflect the final attributes
applied to the string.
.RE
.\" ---------------------------------------------------------------------------
.B dlg_progressbox
implements the "\fB--prgbox\fP" and "\fB--progressbox\fP" options.
.RS
.TP 5
.B const char * \fItitle
is the title on the top of the widget.
.TP 5
.B const char * \fIcprompt
is the prompt text shown within the widget.
If empty or null, no prompt is shown.
.TP 5
.B int \fIheight
is the desired height of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIwidth
is the desired width of the box.
If zero, the height is based on the screen size.
.TP 5
.B int \fIpauseopt
if true, an "OK" button will be shown,
and the dialog will wait for it to complete.
With an "OK" button, it is denoted a "programbox",
without an "OK" button, it is denoted a "progressbox".
.TP 5
.B FILE * \fIfp
is the file pointer, which may be a pipe or a regular file.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_put_backtitle
Display the background title if \fBdialog_vars.backtitle\fP is non-null.
The background title is shown at the top of the screen.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_register_buttons
The widget developer should call this function after \fBdlg_register_window\fP,
for the list of button labels associated with the widget.
One may bind a key to a button, e.g., "OK" for \fBDLGK_OK\fP,
.RS
.TP 5
.B WINDOW * \fIwin
is the window with which to associate the buttons
.TP 5
.B const char * \fIname
is the widget's binding name (usually the name of the widget).
.TP 5
.B const char ** \fIbuttons
is the list of buttons
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_register_window
For a given named widget's window, associate a binding table.
.RS
.TP 5
.B WINDOW * \fIwin
is the window with which to associate the buttons
.TP 5
.B const char * \fIname
is the widget's binding name (usually the name of the widget).
.TP 5
.B DLG_KEYS_BINDING * \fIbinding
is the binding table
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_remove_callback
Remove a callback.
.RS
.TP 5
.B DIALOG_CALLBACK * \fIp
contains the callback information.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_renamed_menutext
This is a utility function which supports the \fB--inputmenu\fP option of
the \fB\*p\fP program.
If \fBdialog_vars.input_menu\fP is set, \fBdialog_menu\fP passes this
pointer to \fBdlg_menu\fP as the \fIrename_menutext\fP parameter.
Otherwise, it passes \fBdlg_dummy_menutext\fP.
.IP
The function should add "RENAMED" to \fBdialog_vars.input_result\fP ,
followed by the menu item's name and the \fInewtext\fP value
(with a space separating the three items),
and return \fBDLG_EXIT_EXTRA\fP.
.RS
.TP 5
.B DIALOG_LISTITEM * \fIitems
is the list of menu items
.TP 5
.B int \fIcurrent
is the index of the currently-selected item
.TP 5
.B char * \fInewtext
is the updated text for the menu item
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_restore_vars
Restore \fB\*p\fP's variables from the given variable (see \fBdialog_save_vars\fP).
.RS
.TP 5
.B DIALOG_VARS * \fIsave
is the variable from which to restore.
.RE
.IP
The 
\fIDIALOG_VARS.input_length\fP and
\fIDIALOG_VARS.input_result\fP members are treated specially,
since these are used by a widget to pass data to the caller.
They are not modified by this function.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_result_key
Test a \fB\*p\fP internal keycode to see if it corresponds to one of the push
buttons on the widget such as "OK".
This is only useful if there are user-defined key bindings, since there are
no built-in bindings that map directly to \fBDLGK_OK\fP, etc.
Return true if a mapping was done.
.RS
.TP 5
.B int \fIdialog_key
is the \fB\*p\fP key to test
.TP 5
.B int \fIfkey
is true if this is a function key
.TP 5
.B int * \fIresultp
store the result of the mapping in the referenced location.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_save_vars
Save \fB\*p\fP's variables into the given variable (see \fBdialog_restore_vars\fP).
.RS
.TP 5
.B DIALOG_VARS * \fIsave
is the variable into which to save.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_set_focus
Set focus on the given window,
making it display above other windows on the screen.
.RS
.TP 5
.B WINDOW * \fIparent
is the parent window (usually the top-level window of a widget)
.TP 5
.B WINDOW * \fIwin
is the window on which to place focus (usually a subwindow of a widget)
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_set_result
Setup a fixed-buffer for the result in \fBdialog_vars.input_result\fP 
.RS
.TP 5
.B const char * \fIstring
is the new contents for the result
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_show_string
Displays the string, shifted as necessary, to fit within the box and show
the current character-offset.
.RS
.TP 5
.B WINDOW * \fIwin
is the window within which to display
.TP 5
.B const char * \fIstring
is the string to display
.TP 5
.B int \fIoffset
is the starting (character, not bytes) offset
.TP 5
.B chtype \fIattr
is the window attribute to use for the string
.TP 5
.B int \fIy_base
beginning row on screen
.TP 5
.B int \fIx_base
beginning column on screen
.TP 5
.B int \fIx_last
number of columns on screen
.TP 5
.B bool \fIhidden
if true, do not echo input
.TP 5
.B bool \fIforce
if true, force repaint
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_strclone
duplicate the string, like \fBstrdup\fP.
.RS
.TP 5
.B const char * \fIcprompt
is the string to duplicate
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_strcmp
compare two strings, ignoring case.
.RS
.TP 5
.B const char * \fIa
is one string
.TP 5
.B const char * \fIb
is the other string
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_string_to_argv
Convert a string to an argument vector
returning an index (which must be freed by the caller).
The string is modified (replacing gaps between tokens with nulls).
.RS
.TP 5
.B char *\fIblob
is the string to convert.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_sub_window
create a subwindow, e.g., for an input area of a widget
.RS
.TP 5
.B WINDOW * \fIwin
is the parent window
.TP 5
.B int \fIheight
is the subwindow's height
.TP 5
.B int \fIwidth
is the subwindow's width
.TP 5
.B int \fIy
is the subwindow's top-row
.TP 5
.B int \fIx
is the subwindow's left-column
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_tab_correct_str
If the \fBdialog_vars.tab_correct\fP is true, convert tabs to single spaces.
Return the converted result.
The caller is responsible for freeing the string.
.RS
.TP 5
.B char * \fIprompt
is the string to convert
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_trace
If the parameter is non-null, opens a trace file with that
name and stores the file pointer in \fBdialog_state.trace\fP.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_trace_chr
If \fBdialog_state.trace\fP is set, 
translate the parameters into a printable representation,
log it on a "chr" line.
.RS
.TP 5
.B int ch
is the nominal keycode value.
.TP 5
.B int fkey
is nonzero if the value is really a function key.
Some of these may be values declared in the DLG_KEYS_ENUM.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_trace_msg
Write a formatted message to the trace file.
.RS
.TP 5
.B const char * \fIfmt
is the format of the \fBprintf\fP-like message to write.
.TP 5
.B ...
.br
are the variables to apply to the \fIfmt\fP format.
.RE
.IP
Use the DLG_TRACE macro for portability, in case the trace
feature is not compiled into the library.
It uses an extra level of parentheses to work with a variable number of
parameters, e.g.,
.ES
.EX
DLG_TRACE(("this is dialog version %s\\n", dialog_version()));
.EE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_trace_win
If \fBdialog_state.trace\fP is set, 
log a printable picture of the given window.
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_trim_string
The \fBdialog\fP program uses this in each widget to adjust the
message string,
which may contain the newline character (referred to as '\\n')
and/or the special substring "\\n"
(which can be translated into a newline character).
.IP
There are several optional features:
.RS
.bP
Unless \fBdialog_vars.no_nl_expand\fP is set,
.RS
.bP
If it has "\\n" substrings,
the function preserves extra spaces.
For instance, spaces following a newline (substring or character)
are preserved to use as an indentation.
.bP
The function changes embedded "\\n" substrings to '\\n' characters.
.RE
.bP
If \fBdialog_vars.no_nl_expand\fP is not set,
or if there are no "\\n" substrings,
this function strips all extra spaces to simplify justification.
.bP
If \fBdialog_vars.cr_wrap\fP is set,
the function preserves '\\n' newline characters.
Otherwise, each '\\n' newline character is converted to a space.
.bP
Unless \fBdialog_vars.nocollapse\fP is set,
each tab character is converted to a space,
and sequences of blanks (space or tab) are reduced to a single space.
.RE
.RS
.TP 5
.B char * \fIsrc
is the string to trim
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_unregister_window
Remove the bindings for a given window.
.RS
.TP 5
.B WINDOW * \fIwin
is the window from which to remove bindings
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_update_gauge
Update a gauge widget to show a different percentage value.
.RS
.TP 5
.B void *\fIobjptr
points to the gauge object to update.
.TP 5
.B int \fIpercent
is the new percentage value to display.
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_yes_buttoncode
Map the given button index for \fBdlg_yes_labels\fP into \fB\*p\fP's exit-code.
.RS
.TP 5
.B int \fIbutton
is the button index
.RE
.\" ---------------------------------------------------------------------------
.TP 5
.B dlg_yes_labels
Return a list of buttons for Yes/No labels.
.
.\" ************************************************************************
.SH SEE ALSO
\fB\*p\fP (1).
.
.\" ************************************************************************
.SH AUTHOR
Thomas E. Dickey