curs_window(3)

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

SYNOPSIS
#include <ncurses.h> WINDOW *newwin(int nlines, int ncols, int begin_y,
      intbegin_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
The newwin routine creates and returns a pointer to a new window 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). The delwin routine deletes the named window, freeing all memory associated with it (it does not actually erase the window's screen image). Subwindows must be deleted before the main window can be deleted. The mvwin routine 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. The subwin routine creates and returns a pointer to a new window 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 necessary to call touchwin or touchline on orig before calling wrefresh on the subwindow. The derwin routine is the same as subwin, except that begin_y and begin_x are relative to the origin of the window orig rather than the screen. There is no difference between the subwindows and the derived windows. The mvderwin routine moves a derived window (or subwindow) inside its parent window. The screen-relative parameters of the window are not changed. This routine is used to display different parts of the parent window at the same physical position on the screen. The dupwin routine creates an exact duplicate of the window win. Each ncurses window maintains two data structures: the character image structure and the status structure. The character image structure is shared among all windows in the window hierarchy (i.e., the window with all subwindows). The status structure, which contains information about individual line changes in the window, is private to each window. The routine wrefresh uses the status data structure when performing screen updating. Since status structures are not shared, changes made to one window in the hierarchy may not be properly reflected on the screen. The routine wsyncup causes the changes in the status structure of a window to be reflected in the status structures of its ancestors. If syncok is called with second argument TRUE then wsyncup is called automatically whenever there is a change in the window. The routine wcursyncup updates the current cursor position of all the ancestors of the window to reflect the current cursor position of the window. The routine wsyncdown updates the status structure of the window to reflect the changes in the status structures of its ancestors. Applications seldom call this routine because it is called automatically by wrefresh.

RETURN VALUE
Routines that return an integer return the integer ERR upon failure and an integer value other than ERR upon successful completion. delwin returns the integer ERR upon failure and OK upon successful completion. Routines that return pointers return NULL on error.

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, etc.) are flaky, incompletely implemented, and not well tested, especially in their interaction with scrolling.

SEE ALSO
ncurses(3), curs_refresh(3), curs_touch(3)