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curs_window 3x



curs_window(3x)                                         curs_window(3x)




NAME

       newwin, delwin, mvwin, subwin, derwin, mvderwin, dupwin,
       wsyncup, syncok, wcursyncup, wsyncdown - create curses
       windows


SYNOPSIS

       #include <curses.h>

       WINDOW *newwin(int nlines, int ncols, int begin_y,
             int begin_x);
       int delwin(WINDOW *win);
       int mvwin(WINDOW *win, int y, int x);
       WINDOW *subwin(WINDOW *orig, int nlines, int ncols,
             int begin_y, int begin_x);
       WINDOW *derwin(WINDOW *orig, int nlines, int ncols,
             int begin_y, int begin_x);
       int mvderwin(WINDOW *win, int par_y, int par_x);
       WINDOW *dupwin(WINDOW *win);
       void wsyncup(WINDOW *win);
       int syncok(WINDOW *win, bool bf);
       void wcursyncup(WINDOW *win);
       void wsyncdown(WINDOW *win);


DESCRIPTION

       Calling newwin creates and returns a pointer to a new win-
       dow with the given number of lines and columns.  The upper
       left-hand  corner of the window is at line begin_y, column
       begin_x.  If either nlines or ncols is zero, they  default
       to  LINES - begin_y and COLS - begin_x.  A new full-screen
       window is created by calling newwin(0,0,0,0).

       Calling delwin deletes the named window, freeing all memo-
       ry associated with it (it does not actually erase the win-
       dow's screen image).  Subwindows must  be  deleted  before
       the main window can be deleted.

       Calling mvwin moves the window so that the upper left-hand
       corner is at position (x, y).  If the move would cause the
       window to be off the screen, it is an error and the window
       is not moved.  Moving subwindows is allowed, but should be
       avoided.

       Calling subwin creates and returns a pointer to a new win-
       dow with the given number of lines, nlines,  and  columns,
       ncols.   The  window  is at position (begin_y, begin_x) on
       the screen.  (This position is relative to the screen, and
       not to the window orig.)  The window is made in the middle
       of the window orig, so that changes  made  to  one  window
       will  affect  both  windows.   The subwindow shares memory
       with the window orig.  When using this routine, it is nec-
       essary  to call touchwin or touchline on orig before call-
       ing wrefresh on the subwindow.

       Calling derwin is the same as calling subwin, except  that
       begin_y and begin_x are relative to the origin of the win-
       dow orig rather than the screen.  There is  no  difference
       between the subwindows and the derived windows.

       Calling mvderwin moves a derived window (or subwindow) in-
       side its parent window.  The screen-relative parameters of
       the  window are not changed.  This routine is used to dis-
       play different parts of the  parent  window  at  the  same
       physical position on the screen.

       Calling  dupwin  creates  an exact duplicate of the window
       win.

       Calling wsyncup touches all locations in ancestors of  win
       that  are changed in win.  If syncok is called with second
       argument TRUE then wsyncup is called automatically whenev-
       er there is a change in the window.

       The  wsyncdown  routine  touches each location in win that
       has been touched in any of  its  ancestor  windows.   This
       routine  is  called by wrefresh, so it should almost never
       be necessary to call it manually.

       The routine wcursyncup updates the current cursor position
       of  all the ancestors of the window to reflect the current
       cursor position of the window.


RETURN VALUE

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

       Routines that return pointers return NULL on error.

       X/Open defines no error conditions.  In  this  implementa-
       tion

              delwin
                   returns  an  error  if  the  window pointer is
                   null, or if the window is the parent of anoth-
                   er window.

                   This  implementation  also maintains a list of
                   windows, and checks that the pointer passed to
                   delwin  is  one  that it created, returning an
                   error if it was not..

              mvderwin
                   returns an error  if  the  window  pointer  is
                   null,  or  if some part of the window would be
                   placed off-screen.

              mvwin
                   returns an error  if  the  window  pointer  is
                   null,  or if the window is really a pad, or if
                   some part of the window would be  placed  off-
                   screen.

              syncok
                   returns  an  error  if  the  window pointer is
                   null.


NOTES

       If many small changes are made to the window, the  wsyncup
       option could degrade performance.

       Note that syncok may be a macro.


BUGS

       The  subwindow  functions (subwin, derwin, mvderwin, wsyn-
       cup, wsyncdown, wcursyncup, syncok) are flaky, incomplete-
       ly implemented, and not well tested.

       The  System  V  curses documentation is very unclear about
       what wsyncup and wsyncdown actually do.  It seems to imply
       that  they  are only supposed to touch exactly those lines
       that are affected by ancestor changes.  The language here,
       and  the  behavior  of  the curses implementation, is pat-
       terned on the XPG4 curses standard.  The weaker XPG4  spec
       may result in slower updates.


PORTABILITY

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


SEE ALSO

       curses(3x), curs_refresh(3x),  curs_touch(3x),  curs_vari-
       ables(3x)



                                                        curs_window(3x)

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