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panel(3X)							     panel(3X)

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  por‐
       tions  of  each	window and the curses stdscr window are hidden or dis‐
       played 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 terminfo 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	 (useful,  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 position 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  suc‐
       cessfully 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  programming 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 imple‐
       mentation, 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 compati‐
       bility 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 link‐
       ers).

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>,  primar‐
       ily  to	assist	in  porting u386mon to systems without a native panels
       library.	 Repackaged for ncurses by Zeyd ben-Halim.

								     panel(3X)
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