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.\" $OpenBSD: panel.3,v 1.9 2010/01/12 23:22:08 nicm Exp $
.\"
.\"***************************************************************************
.\" Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
.\" *
.\" Permission is hereby granted, free of charge, to any person obtaining a *
.\" copy of this software and associated documentation files (the *
.\" "Software"), to deal in the Software without restriction, including *
.\" without limitation the rights to use, copy, modify, merge, publish, *
.\" distribute, distribute with modifications, sublicense, and/or sell *
.\" copies of the Software, and to permit persons to whom the Software is *
.\" furnished to do so, subject to the following conditions: *
.\" *
.\" The above copyright notice and this permission notice shall be included *
.\" in all copies or substantial portions of the Software. *
.\" *
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
.\" *
.\" Except as contained in this notice, the name(s) of the above copyright *
.\" holders shall not be used in advertising or otherwise to promote the *
.\" sale, use or other dealings in this Software without prior written *
.\" authorization. *
.\"***************************************************************************
.\"
.\" $Id: panel.3,v 1.9 2010/01/12 23:22:08 nicm Exp $
.TH panel 3 ""
.ds n 5
.ds d /usr/share/misc/terminfo
.SH NAME
panel - panel stack extension for curses
.SH SYNOPSIS
\fB#include <panel.h>\fR
.P
\fBcc [flags] sourcefiles -lpanel -lncurses\fR
.P
\fBPANEL *new_panel(WINDOW *win)\fR
.br
\fBint bottom_panel(PANEL *pan)\fR
.br
\fBint top_panel(PANEL *pan)\fR
.br
\fBint show_panel(PANEL *pan)\fR
.br
\fBvoid update_panels();\fR
.br
\fBint hide_panel(PANEL *pan)\fR
.br
\fBWINDOW *panel_window(const PANEL *pan)\fR
.br
\fBint replace_panel(PANEL *pan, WINDOW *window)\fR
.br
\fBint move_panel(PANEL *pan, int starty, int startx)\fR
.br
\fBint panel_hidden(const PANEL *pan)\fR
.br
\fBPANEL *panel_above(const PANEL *pan)\fR
.br
\fBPANEL *panel_below(const PANEL *pan)\fR
.br
\fBint set_panel_userptr(PANEL *pan, const void *ptr)\fR
.br
\fBconst void *panel_userptr(const PANEL *pan)\fR
.br
\fBint del_panel(PANEL *pan)\fR
.br
.SH DESCRIPTION
Panels are \fBcurses\fR(3) windows with the added feature of
depth. Panel functions allow the use of stacked windows and ensure
the proper portions of each window and the curses \fBstdscr\fR window are
hidden or displayed when panels are added, moved, modified or removed.
The set of currently visible panels is the stack of panels. The
\fBstdscr\fR window is beneath all panels, and is not considered part
of the stack.
.P
A window is associated with every panel. The panel routines enable
you to create, move, hide, and show panels, as well as position a
panel at any desired location in the stack.
.P
Panel routines are a functional layer added to \fBcurses\fR(3), make only
high-level curses calls, and work anywhere terminfo curses does.
.SH FUNCTIONS
.TP
.B new_panel(win)
allocates a \fBPANEL\fR structure, associates it with
\fBwin\fR, places the panel on the top of the stack (causes it
to be displayed above any other panel) and returns a
pointer to the new panel.
.TP
.B update_panels()
refreshes the virtual screen to reflect the relations between the
panels in the stack, but does not call doupdate() to refresh the
physical screen. Use this function and not wrefresh or wnoutrefresh.
update_panels() may be called more than once before a call to
doupdate(), but doupdate() is the function responsible for updating
the physical screen.
.TP
.B del_panel(pan)
removes the given panel from the stack and deallocates the
\fBPANEL\fR structure (but not its associated window).
.TP
.B hide_panel(pan)
removes the given panel from the panel stack and thus hides it from
view. The \fBPANEL\fR structure is not lost, merely removed from the stack.
.TP
.B panel_hidden(pan)
returns TRUE if the panel is in the panel stack,
FALSE if it is not.
If the panel is a null pointer, return ERR.
.TP
.B show_panel(pan)
makes a hidden panel visible by placing it on top of the panels in the
panel stack. See COMPATIBILITY below.
.TP
.B top_panel(pan)
puts the given visible panel on top of all panels in the stack. See
COMPATIBILITY below.
.TP
.B bottom_panel(pan)
puts panel at the bottom of all panels.
.TP
.B move_panel(pan,starty,startx)
moves the given panel window so that its upper-left corner is at
\fBstarty\fR, \fBstartx\fR. It does not change the position of the
panel in the stack. Be sure to use this function, not \fBmvwin()\fR,
to move a panel window.
.TP
.B replace_panel(pan,window)
replaces the current window of panel with \fBwindow\fR (useful, for
example if you want to resize a panel; if you're using \fBncurses\fR,
you can call \fBreplace_panel\fR on the output of \fBwresize\fR(3)).
It does not change the position of the panel in the stack.
.TP
.B panel_above(pan)
returns a pointer to the panel above pan. If the panel argument is
\fB(PANEL *)0\fR, it returns a pointer to the bottom panel in the stack.
.TP
.B panel_below(pan)
returns a pointer to the panel just below pan. If the panel argument
is \fB(PANEL *)0\fR, it returns a pointer to the top panel in the stack.
.TP
.B set_panel_userptr(pan,ptr)
sets the panel's user pointer.
.TP
.B panel_userptr(pan)
returns the user pointer for a given panel.
.TP
.B panel_window(pan)
returns a pointer to the window of the given panel.
.SH DIAGNOSTICS
Each routine that returns a pointer returns \fBNULL\fR if an error
occurs. Each routine that returns an int value returns \fBOK\fR if it
executes successfully and \fBERR\fR if not.
.SH COMPATIBILITY
Reasonable care has been taken to ensure compatibility
with the native panel facility introduced in SVr3.2 (inspection of
the SVr4 manual pages suggests the programming interface is unchanged).
The \fBPANEL\fR data structures are merely similar. The programmer
is cautioned not to directly use \fBPANEL\fR fields.
.P
The functions \fBshow_panel()\fR and \fBtop_panel()\fR are identical
in this implementation, and work equally well with displayed or hidden
panels. In the native System V implementation, \fBshow_panel()\fR is
intended for making a hidden panel visible (at the top of the stack)
and \fBtop_panel()\fR is intended for making an already-visible panel
move to the top of the stack. You are cautioned to use the correct
function to ensure compatibility with native panel libraries.
.SH NOTE
In your library list, libpanel.a should be before libncurses.a; that is,
you want to say `-lpanel -lncurses', not the other way around (which would
usually give a link-error).
.SH FILES
.P
panel.h
interface for the panels library
.P
libpanel.a
the panels library itself
.SH SEE ALSO
\fBcurses\fR(3)
.PP
This describes \fBncurses\fR
version 5.7.
.SH AUTHOR
Originally written by Warren Tucker <wht@n4hgf.mt-park.ga.us>,
primarily to assist in porting u386mon to systems without a native
panels library. Repackaged for ncurses by Zeyd ben-Halim.
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