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NAME
     panel - panel stack extension for curses

SYNOPSIS
     #include <panel.h>

     cc [flags] sourcefiles -lpanel -lncurses

     PANEL *new_panel(WINDOW *win)
     int bottom_panel(PANEL *pan)
     int top_panel(PANEL *pan)
     int show_panel(PANEL *pan)
     void update_panels();
     int hide_panel(PANEL *pan)
     WINDOW *panel_window(const PANEL *pan)
     int replace_panel(PANEL *pan, WINDOW *window)
     int move_panel(PANEL *pan, int starty, int startx)
     int panel_hidden(const PANEL *pan)
     PANEL *panel_above(const PANEL *pan)
     PANEL *panel_below(const PANEL *pan)
     int set_panel_userptr(PANEL *pan, const void *ptr)
     const void *panel_userptr(const PANEL *pan)
     int del_panel(PANEL *pan)

DESCRIPTION
     Panels are curses(3X) 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
     stdscr 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 stdscr window is beneath
     all panels, and is not considered part of the stack.

     A window is associated with every panel. The panel  routines
     enable  you to create, move, hides, and show panels, as well
     as position a panel at any desired location in the stack.

     Panel routines are a functional layer added  to  curses(3X),
     make  only  high-level  curses calls, and work anywhere ter-
     minfo curses does.

FUNCTIONS
     new_panel(win)
          allocates  a  PANEL structure, associates it with  win,
          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.

     void 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.

     del_panel(pan)
          removes the given panel from the  stack and deallocates
          the PANEL structure (but not its associated window).

     hide_panel(pan)
          removes the given panel from the panel stack  and  thus
          hides  it  from  view. The PANEL structure is not lost,
          merely removed from the stack.

     show_panel(pan)
          makes a hidden panel visible by placing it  on  top  of
          the panels in the panel stack. See COMPATIBILITY below.

     top_panel(pan)
          puts the given visible panel on top of  all  panels  in
          the stack.  See COMPATIBILITY below.

     bottom_panel(pan)
          puts panel at the bottom of all panels.

     move_panel(pan,starty,startx)
          moves the given panel window  so  that  its  upper-left
          corner  is  at  starty, startx.  It does not change the
          position of the panel in the stack.   Be  sure  to  use
          this function, not mvwin(), to move a panel window.

     replace_panel(pan,window)
          replaces the current window of panel with window  (use-
          ful,  for  example  if  you  want to resize a panel; if
          you're using ncurses, you can call replace_panel on the
          output  of  wresize(3X)).  It does not change the posi-
          tion of the panel in the stack.

     panel_above(pan)
          returns a pointer to the panel above pan.  If the panel
          argument  is  (PANEL  *)0,  it returns a pointer to the
          bottom panel in the stack.

     panel_below(pan)
          returns a pointer to the panel just below pan.  If  the
          panel  argument  is (PANEL *)0, it returns a pointer to
          the top panel in the stack.

     set_panel_userptr(pan,ptr)
          sets the panel's user pointer.

     panel_userptr(pan)
          returns the user pointer for a given panel.

     panel_window(pan)
          returns a pointer to the window of the given panel.

DIAGNOSTICS
     Each routine that returns a pointer returns NULL if an error
     occurs. Each routine that returns an int value returns OK if
     it executes successfully and ERR if not.

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  program-
     ming interface is unchanged).  The PANEL data structures are
     merely   similar.  The   programmer  is  cautioned  not   to
     directly use PANEL fields.

     The functions show_panel() and top_panel() are identical  in
     this implementation, and work equally well with displayed or
     hidden panels.   In  the  native  System  V  implementation,
     show_panel()  is  intended for making a hidden panel visible
     (at the top of the stack) and top_panel()  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.

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 give you a link  error
     using GNU ld(1) and some other linkers).

FILES
     panel.h interface for the panels library

     libpanel.a the panels library itself

SEE ALSO
     curses(3X)

AUTHOR
     Originally   written   by   Warren   Tucker   <wht@n4hgf.mt-
     park.ga.us>,  primarily to assist in porting u386mon to sys-
     tems  without  a  native  panels  library.   Repackaged  for
     ncurses by Zeyd ben-Halim.

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