создать окна с помощью библиотеки Curses (create curses windows)
Имя (Name)
newwin, delwin, mvwin, subwin, derwin, mvderwin, dupwin, wsyncup,
syncok, wcursyncup, wsyncdown - create curses windows
Синопсис (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);
Описание (Description)
newwin
Calling newwin 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).
Regardless of the function used for creating a new window (e.g.,
newwin, subwin, derwin, newpad), rather than a duplicate (with
dupwin), all of the window modes are initialized to the default
values. These functions set window modes after a window is
created:
idcok, idlok, immedok, keypad, leaveok, nodelay, scrollok,
setscrreg, syncok, wbkgdset, wbkgrndset, and wtimeout
delwin
Calling delwin 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.
mvwin
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.
subwin
Calling subwin 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. The
subwindow shares memory with the window orig, so that changes
made to one window will affect both windows. When using this
routine, it is necessary to call touchwin or touchline on orig
before calling wrefresh on the subwindow.
derwin
Calling derwin is the same as calling 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.
Calling mvderwin 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.
dupwin
Calling dupwin creates an exact duplicate of the window win.
wsyncup
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 whenever there is a
change in the window.
wsyncdown
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.
wcursyncup
The routine wcursyncup updates the current cursor position of all
the ancestors of the window to reflect the current cursor
position of the window.
Возвращаемое значение (Return value)
Routines that return an integer return the integer 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.
X/Open defines no error conditions. In this implementation
delwin
returns an error if the window pointer is null, or if the
window is the parent of another window.
derwin
returns an error if the parent window pointer is null, or if
any of its ordinates or dimensions is negative, or if the
resulting window does not fit inside the parent window.
dupwin
returns an error if the window pointer is null.
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.
newwin
will fail if either of its beginning ordinates is negative,
or if either the number of lines or columns is negative.
syncok
returns an error if the window pointer is null.
subwin
returns an error if the parent window pointer is null, or if
any of its ordinates or dimensions is negative, or if the
resulting window does not fit inside the parent window.
The functions which return a window pointer may also fail if
there is insufficient memory for its data structures. Any of
these functions will fail if the screen has not been initialized,
i.e., with initscr or newterm.
Примечание (Note)
If many small changes are made to the window, the wsyncup option
could degrade performance.
Note that syncok may be a macro.
Ошибки (баги) (Bugs)
The subwindow functions (subwin, derwin, mvderwin, wsyncup,
wsyncdown, wcursyncup, syncok) are flaky, incompletely
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 patterned on the XPG4 curses standard.
The weaker XPG4 spec may result in slower updates.
Портативность (Portability)
The XSI Curses standard, Issue 4 describes these functions.
Смотри также (See also)
curses(3X), curs_refresh(3X), curs_touch(3X), curs_variables(3X)
