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curs_pad 3x



curs_pad(3x)                                               curs_pad(3x)




NAME

       newpad, subpad, prefresh, pnoutrefresh, pechochar,
       pecho_wchar - create and display curses pads


SYNOPSIS

       #include <curses.h>

       WINDOW *newpad(int nlines, int ncols);
       WINDOW *subpad(WINDOW *orig, int nlines, int ncols,
             int begin_y, int begin_x);
       int prefresh(WINDOW *pad, int pminrow, int pmincol,
             int sminrow, int smincol, int smaxrow, int smaxcol);
       int pnoutrefresh(WINDOW *pad, int pminrow, int pmincol,
             int sminrow, int smincol, int smaxrow, int smaxcol);
       int pechochar(WINDOW *pad, chtype ch);
       int pecho_wchar(WINDOW *pad, const cchar_t *wch);


DESCRIPTION

       The newpad routine creates and returns a pointer to a  new
       pad data structure with the given number of lines, nlines,
       and columns, ncols.  A pad is like a window,  except  that
       it is not restricted by the screen size, and is not neces-
       sarily associated with a particular part  of  the  screen.
       Pads can be used when a large window is needed, and only a
       part of the window will be on the screen at one time.  Au-
       tomatic refreshes of pads (e.g., from scrolling or echoing
       of input) do not occur.  It is not legal to call  wrefresh
       with  a  pad  as  an  argument;  the  routines prefresh or
       pnoutrefresh should be called instead.   Note  that  these
       routines require additional parameters to specify the part
       of the pad to be displayed and the location on the  screen
       to be used for the display.

       The subpad routine creates and returns a pointer to a sub-
       window within a  pad  with  the  given  number  of  lines,
       nlines,  and  columns,  ncols.   Unlike subwin, which uses
       screen coordinates, the window is  at  position  (begin_x,
       begin_y)  on the pad.  The window is made in the middle of
       the window orig, so that changes made to one window affect
       both windows.  During the use of this routine, it will of-
       ten be necessary to call touchwin or touchline on orig be-
       fore calling prefresh.

       The  prefresh  and  pnoutrefresh routines are analogous to
       wrefresh and wnoutrefresh except that they relate to  pads
       instead  of windows.  The additional parameters are needed
       to indicate what part of the pad and screen are  involved.
       The pminrow and pmincol parameters specify the upper left-
       hand corner of the rectangle to be displayed in  the  pad.
       The  sminrow,  smincol,  smaxrow,  and  smaxcol parameters
       specify the edges of the rectangle to be displayed on  the
       screen.   The  lower right-hand corner of the rectangle to
       be displayed in the pad is calculated from the screen  co-
       ordinates,  since  the  rectangles  must be the same size.
       Both rectangles must be entirely  contained  within  their
       respective  structures.  Negative values of pminrow, pmin-
       col, sminrow, or smincol are treated as if they were zero.

       The pechochar routine is functionally equivalent to a call
       to  addch  followed by a call to refresh, a call to waddch
       followed by a call to wrefresh, or a call to  waddch  fol-
       lowed  by  a  call to prefresh.  The knowledge that only a
       single character is being output is taken into  considera-
       tion  and, for non-control characters, a considerable per-
       formance gain might be seen by using  these  routines  in-
       stead of their equivalents.  In the case of pechochar, the
       last location of the pad on the screen is reused  for  the
       arguments to prefresh.

       The  pecho_wchar  function is the analogous wide-character
       form of pechochar.  It outputs one character to a pad  and
       immediately  refreshes the pad.  It does this by a call to
       wadd_wch followed by a call to prefresh.


RETURN VALUE

       Routines that return an integer return  ERR  upon  failure
       and  OK  (SVr4 only specifies "an integer value other than
       ERR") upon successful completion.

       Routines that return pointers return NULL  on  error,  and
       set errno to ENOMEM.

       X/Open  does not define any error conditions.  In this im-
       plementation

              prefresh and pnoutrefresh
                   return an error if the window pointer is null,
                   or if the window is not really a pad or if the
                   area to refresh extends off-screen or  if  the
                   minimum coordinates are greater than the maxi-
                   mum.

              pechochar
                   returns an error if the window is not really a
                   pad,  and the associated call to wechochar re-
                   turns an error.

              pecho_wchar
                   returns an error if the window is not really a
                   pad,  and  the  associated call to wecho_wchar
                   returns an error.


NOTES

       Note that pechochar may be a macro.


PORTABILITY

       The XSI Curses standard, Issue  4  describes  these  func-
       tions.


SEE ALSO

       curses(3x),  curs_refresh(3x),  curs_touch(3x),  curs_add-
       ch(3x).



                                                           curs_pad(3x)

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