.\" $OpenBSD: curs_window.3,v 1.3 1997/12/03 05:45:07 millert Exp $ .TH curs_window 3 "" .SH NAME \fBnewwin\fR, \fBdelwin\fR, \fBmvwin\fR, \fBsubwin\fR, \fBderwin\fR, \fBmvderwin\fR, \fBdupwin\fR, \fBwsyncup\fR, \fBsyncok\fR, \fBwcursyncup\fR, \fBwsyncdown\fR - create \fBcurses\fR windows .SH SYNOPSIS \fB#include \fR \fBWINDOW *newwin(int nlines, int ncols, int begin_y,\fR \fBintbegin_x);\fR .br \fBint delwin(WINDOW *win);\fR .br \fBint mvwin(WINDOW *win, int y, int x);\fR .br \fBWINDOW *subwin(WINDOW *orig, int nlines, int ncols, int begin_y, int begin_x);\fR .br \fBWINDOW *derwin(WINDOW *orig, int nlines, int ncols, int begin_y, int begin_x);\fR .br \fBint mvderwin(WINDOW *win, int par_y, int par_x);\fR .br \fBWINDOW *dupwin(WINDOW *win);\fR .br \fBvoid wsyncup(WINDOW *win);\fR .br \fBint syncok(WINDOW *win, bool bf);\fR .br \fBvoid wcursyncup(WINDOW *win);\fR .br \fBvoid wsyncdown(WINDOW *win);\fR .br .SH DESCRIPTION Calling \fBnewwin\fR 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 \fIbegin\fR_\fIy\fR, column \fIbegin\fR_\fIx\fR. If either \fInlines\fR or \fIncols\fR is zero, they default to \fBLINES -\fR \fIbegin\fR_\fIy\fR and \fBCOLS -\fR \fIbegin\fR_\fIx\fR. A new full-screen window is created by calling \fBnewwin(0,0,0,0)\fR. Calling \fBdelwin\fR 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. Calling \fBmvwin\fR moves the window so that the upper left-hand corner is at position (\fIx\fR, \fIy\fR). 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 \fBsubwin\fR creates and returns a pointer to a new window with the given number of lines, \fInlines\fR, and columns, \fIncols\fR. The window is at position (\fIbegin\fR_\fIy\fR, \fIbegin\fR_\fIx\fR) on the screen. (This position is relative to the screen, and not to the window \fIorig\fR.) The window is made in the middle of the window \fIorig\fR, so that changes made to one window will affect both windows. The subwindow shares memory with the window \fIorig\fR. When using this routine, it is necessary to call \fBtouchwin\fR or \fBtouchline\fR on \fIorig\fR before calling \fBwrefresh\fR on the subwindow. Calling \fBderwin\fR is the same as calling \fBsubwin,\fR except that \fIbegin\fR_\fIy\fR and \fIbegin\fR_\fIx\fR are relative to the origin of the window \fIorig\fR rather than the screen. There is no difference between the subwindows and the derived windows. Calling \fBmvderwin\fR 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. Calling \fBdupwin\fR creates an exact duplicate of the window \fIwin\fR. Calling \fBwsyncup\fR touches all locations in ancestors of \fIwin\fR that are changed in \fIwin\fR. If \fBsyncok\fR is called with second argument \fBTRUE\fR then \fBwsyncup\fR is called automatically whenever there is a change in the window. The \fBwsyncdown\fR routine touches each location in \fIwin\fR that has been touched in any of its ancestor windows. This routine is called by \fBwrefresh\fR, so it should almost never be necessary to call it manually. The routine \fBwcursyncup\fR updates the current cursor position of all the ancestors of the window to reflect the current cursor position of the window. .SH RETURN VALUE Routines that return an integer return the integer \fBERR\fR upon failure and \fBOK\fR (SVr4 only specifies "an integer value other than \fBERR\fR") upon successful completion. \fBdelwin\fR returns the integer \fBERR\fR upon failure and \fBOK\fR upon successful completion. Routines that return pointers return \fBNULL\fR on error. .SH NOTES If many small changes are made to the window, the \fBwsyncup\fR option could degrade performance. Note that \fBsyncok\fR may be a macro. .SH BUGS The subwindow functions (\fIsubwin\fR, \fIderwin\fR, \fImvderwin\fR, \fBwsyncup\fR, \fBwsyncdown\fR, \fBwcursyncup\fR, \fBsyncok\fR) are flaky, incompletely implemented, and not well tested. The System V curses documentation is very unclear about what \fBwsyncup\fR and \fBwsyncdown\fR 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 \fBcurses\fR implementation, is patterned on the XPG4 curses standard. The weaker XPG4 spec may result in slower updates. .SH PORTABILITY The XSI Curses standard, Issue 4 describes these functions. .SH SEE ALSO \fBcurses\fR(3), \fBcurs_refresh\fR(3), \fBcurs_touch\fR(3) .\"# .\"# The following sets edit modes for GNU EMACS .\"# Local Variables: .\"# mode:nroff .\"# fill-column:79 .\"# End: