curs_window, delwin, derwin, dupwin, mvderwin, mvwin, newwin, subwin, syncok, wcursyncup, wsyncdown, wsyncup - Routines that create Curses windows
Curses Library (libcurses)
Interfaces documented on this reference page conform to industry standards as follows:
delwin, dupwin, mvwin, newwin, subwin: XPG4, XPG4-UNIX
derwin, mvderwin, syncok, wcursyncup, wsyncdown, wsyncup: XPG4-UNIX
Refer to the
reference page for more information
about industry standards and associated tags.
The newwin routine creates and returns a pointer to a new window with the given number of lines, nlines, and columns, ncols. The upper left-hand corner of the window is at line begin_y and column begin_x. If nlines is zero, it defaults to (LINES - begin_y); if ncols is zero, it defaults to (COLS - begin_x). Applications create a new full-screen window by calling newwin(0,0,0,0).
The newwin routine must not create a window larger than the physical size of the screen, or the size defined by using the environment variables LINES and COLUMNS. Use pads rather than windows whenever the application requires a window larger than the terminal screen. See curs_pad(3) for information about functions that create and manipulate pads.
The delwin routine deletes the named window, freeing all memory associated with it. Applications must delete subwindows before deleting the main window.
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 routine makes the subwindow in the middle of the window orig, so that changes made to one window affect both windows. The subwindow shares memory with the window orig. When using subwin, applications must call touchwin or touchline on window 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 to the origin of the screen. There is no other difference between subwindows created by subwin and derived windows created by derwin.
The mvderwin routine moves a derived window (or a subwindow) inside its parent window. The screen-relative parameters of the window are not changed. Applications use this routine 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 Curses 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 (that is, the original window and all associated subwindows). The status structure, which contains information about individual line changes in the window, is private to each window. The wrefresh routine 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 wsyncup routine causes the changes in the status structure of a window to be reflected in the status structures of its ancestors. If the application calls syncok with TRUE as the second parameter, then Curses calls wsyncup automatically whenever there is a change in the window.
The wcursyncup routine updates the current cursor position of all the ancestors of the specified window to reflect the current cursor position of the specified window.
routine updates the status structure
of the specified window to reflect the changes in the status structures of
its ancestors. Applications seldom call this routine because it is called
The header file <curses.h> automatically includes the header file <stdio.h>.
If many small changes are made to a window, using
can degrade performance.
Routines that return an integer return the integer ERR upon failure and OK upon successful completion.
Routines that return pointers return
Functions: curses(3), curs_refresh(3), curs_touch(3)