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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, hide, 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.

       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.

       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.

       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 usually give a link-error).

FILES
       panel.h interface for the panels library

       libpanel.a the panels library itself

SEE ALSO
       curses(3X)

       This describes ncurses version 5.7 (patch 20081102).

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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