.\" $OpenBSD: curs_window.3,v 1.10 2010/01/12 23:21:59 nicm Exp $ .\" .\"*************************************************************************** .\" Copyright (c) 1998-2005,2006 Free Software Foundation, Inc. * .\" * .\" Permission is hereby granted, free of charge, to any person obtaining a * .\" copy of this software and associated documentation files (the * .\" "Software"), to deal in the Software without restriction, including * .\" without limitation the rights to use, copy, modify, merge, publish, * .\" distribute, distribute with modifications, sublicense, and/or sell * .\" copies of the Software, and to permit persons to whom the Software is * .\" furnished to do so, subject to the following conditions: * .\" * .\" The above copyright notice and this permission notice shall be included * .\" in all copies or substantial portions of the Software. * .\" * .\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * .\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * .\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * .\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * .\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * .\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * .\" THE USE OR OTHER DEALINGS IN THE SOFTWARE. * .\" * .\" Except as contained in this notice, the name(s) of the above copyright * .\" holders shall not be used in advertising or otherwise to promote the * .\" sale, use or other dealings in this Software without prior written * .\" authorization. * .\"*************************************************************************** .\" .\" $Id: curs_window.3,v 1.10 2010/01/12 23:21:59 nicm Exp $ .TH curs_window 3 "" .na .hy 0 .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 .ad .hy .SH SYNOPSIS \fB#include <curses.h>\fR .sp \fBWINDOW *newwin(int nlines, int ncols, int begin_y,\fR \fBint begin_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,\fR \fBint begin_y, int begin_x);\fR .br \fBWINDOW *derwin(WINDOW *orig, int nlines, int ncols,\fR \fBint 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. .PP 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. .PP 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. .PP 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. .PP 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. .PP 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. .PP Calling \fBdupwin\fR creates an exact duplicate of the window \fIwin\fR. .PP 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. .PP 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. .PP 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. .PP Routines that return pointers return \fBNULL\fR on error. .PP X/Open defines no error conditions. In this implementation .RS .TP 5 \fBdelwin\fR returns an error if the window pointer is null, or if the window is the parent of another window. .IP This implementation also maintains a list of windows, and checks that the pointer passed to \fBdelwin\fP is one that it created, returning an error if it was not.. .TP 5 \fBmvderwin\fP returns an error if the window pointer is null, or if some part of the window would be placed off-screen. .TP 5 \fBmvwin\fP 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. .TP 5 \fBsyncok\fP returns an error if the window pointer is null. .RE .SH NOTES If many small changes are made to the window, the \fBwsyncup\fR option could degrade performance. .PP 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. .PP 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: