.\"*************************************************************************** .\" Copyright 2020-2023,2024 Thomas E. Dickey * .\" Copyright 1998-2015,2016 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.3x,v 1.48 2024/04/20 21:20:07 tom Exp $ .TH curs_window 3X 2024-04-20 "ncurses 6.5" "Library calls" .de bP .ie n .IP \(bu 4 .el .IP \(bu 2 .. .SH NAME \fB\%newwin\fP, \fB\%delwin\fP, \fB\%mvwin\fP, \fB\%subwin\fP, \fB\%derwin\fP, \fB\%mvderwin\fP, \fB\%dupwin\fP, \fB\%wsyncup\fP, \fB\%syncok\fP, \fB\%wcursyncup\fP, \fB\%wsyncdown\fP \- create and manipulate \fIcurses\fR windows .SH SYNOPSIS .nf \fB#include .PP \fBWINDOW *newwin( \fBint \fInlines\fB, int \fIncols\fB,\fR \fBint \fIbegin_y\fB, int \fIbegin_x\fB);\fR \fBint delwin(WINDOW *\fIwin\fB);\fR \fBint mvwin(WINDOW *\fIwin\fB, int \fIy\fB, int \fIx\fB);\fR \fBWINDOW *subwin(WINDOW *\fIorig\fB,\fR \fBint \fInlines\fB, int \fIncols\fB,\fR \fBint \fIbegin_y\fB, int \fIbegin_x\fB);\fR \fBWINDOW *derwin(WINDOW *\fIorig\fB,\fR \fBint \fInlines\fB, int \fIncols\fB,\fR \fBint \fIbegin_y\fB, int \fIbegin_x\fB);\fR \fBint mvderwin(WINDOW *\fIwin\fB, int \fIpar_y\fB, int \fIpar_x\fB);\fR \fBWINDOW *dupwin(WINDOW *\fIwin\fB);\fR \fBvoid wsyncup(WINDOW *\fIwin\fB);\fR \fBint syncok(WINDOW *\fIwin\fB, bool \fIbf\fB);\fR \fBvoid wcursyncup(WINDOW *\fIwin\fB);\fR \fBvoid wsyncdown(WINDOW *\fIwin\fB);\fR .fi .SH DESCRIPTION .SS newwin Calling \fBnewwin\fP 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 .RS line \fIbegin\fR_\fIy\fP, .br column \fIbegin\fR_\fIx\fP .RE .PP If either \fInlines\fP or \fIncols\fP is zero, they default to .RS \fBLINES \-\fP \fIbegin\fR_\fIy\fP and .br \fBCOLS \-\fP \fIbegin\fR_\fIx\fP. .RE .PP A new full-screen window is created by calling \fBnewwin(0,0,0,0)\fP. .PP Regardless of the function used for creating a new window (e.g., \fBnewwin\fP, \fBsubwin\fP, \fBderwin\fP, \fBnewpad\fP), rather than a duplicate (with \fBdupwin\fP), all of the window modes are initialized to the default values. These functions set window modes after a window is created: .RS .PP \fB\%idcok\fP \fB\%idlok\fP \fB\%immedok\fP \fB\%keypad\fP \fB\%leaveok\fP \fB\%nodelay\fP \fB\%scrollok\fP \fB\%setscrreg\fP \fB\%syncok\fP \fB\%wbkgdset\fP \fB\%wbkgrndset\fP and \fB\%wtimeout\fP. .RE .SS delwin Calling \fBdelwin\fP 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. .SS mvwin Calling \fBmvwin\fP moves the window so that the upper left-hand corner is at position (\fIx\fP, \fIy\fP). 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. .SS subwin Calling \fBsubwin\fP creates and returns a pointer to a new window with the given number of lines, \fInlines\fP, and columns, \fIncols\fP. The window is at position (\fIbegin\fR_\fIy\fP, \fIbegin\fR_\fIx\fP) on the screen. The subwindow shares memory with the window \fIorig\fP, its \fIancestor\fP, so that changes made to one window will affect both windows. When using this routine, it is necessary to call \fBtouchwin\fP or \fBtouchline\fP on \fIorig\fP before calling \fBwrefresh\fP on the subwindow. .SS derwin Calling \fBderwin\fP is the same as calling \fBsubwin,\fP except that \fIbegin\fR_\fIy\fP and \fIbegin\fR_\fIx\fP are relative to the origin of the window \fIorig\fP rather than the screen. There is no difference between the subwindows and the derived windows. .SS mvderwin Calling \fBmvderwin\fP 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. .SS dupwin Calling \fBdupwin\fP creates an exact duplicate of the window \fIwin\fP. .SS wsyncup Calling \fBwsyncup\fP touches all locations in ancestors of \fIwin\fP that are changed in \fIwin\fP. If \fBsyncok\fP is called with second argument \fBTRUE\fP then \fBwsyncup\fP is called automatically whenever there is a change in the window. .SS wsyncdown The \fBwsyncdown\fP routine touches each location in \fIwin\fP that has been touched in any of its ancestor windows. This routine is called by \fBwrefresh\fP, so it should almost never be necessary to call it manually. .SS wcursyncup The routine \fBwcursyncup\fP 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\fP upon failure and \fBOK\fP (SVr4 only specifies "an integer value other than \fBERR\fP") upon successful completion. .PP Routines that return pointers return \fBNULL\fP on error. .PP X/Open defines no error conditions. In this implementation .TP 5 \fBdelwin\fP returns an error if the window pointer is null, or if the window is the parent of another window. .TP 5 \fBderwin\fP 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. .TP 5 \fBdupwin\fP returns an error if the window pointer is null. .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 \fBnewwin\fP will fail if either of its beginning ordinates is negative, or if either the number of lines or columns is negative. .TP 5 \fBsyncok\fP returns an error if the window pointer is null. .TP 5 \fBsubwin\fP 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. .PP 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 \fBinitscr\fP or \fBnewterm\fP. .SH NOTES If many small changes are made to the window, the \fBwsyncup\fP option could degrade performance. .PP Note that \fBsyncok\fP may be a macro. .SH PORTABILITY X/Open Curses, Issue 4 describes these functions. .PP X/Open Curses states regarding \fBdelwin\fP: .bP It must delete subwindows before deleting their parent. .bP If \fBdelwin\fP is asked to delete a parent window, it can only succeed if the curses library keeps a list of the subwindows. SVr4 curses kept a count of the number of subwindows rather than a list. It simply returned \fBERR\fP when asked to delete a subwindow. Solaris X/Open curses does not even make that check, and will delete a parent window which still has subwindows. .bP Since release 4.0 (1996), \fI\%ncurses\fP maintains a list of windows for each screen, to ensure that a window has no subwindows before allowing deletion. .bP NetBSD copied this feature of \fI\%ncurses\fP in 2003. .br PDCurses follows the scheme used in Solaris X/Open curses. .SH BUGS The subwindow functions \fB\%subwin\fP, \fB\%derwin\fP, \fB\%mvderwin\fP, \fB\%wsyncup\fP, \fB\%wsyncdown\fP, \fB\%wcursyncup\fP, and \fB\%syncok\fP are flaky, incompletely implemented, and not well tested. .PP System\ V's \fIcurses\fP documentation is unclear about what \fB\%wsyncup\fP and \fB\%wsyncdown\fP actually do. It seems to imply that they are supposed to touch only those lines that are affected by changes to a window's ancestors. The language here, and behavior of \fI\%ncurses\fP, is patterned on the X/Open Curses standard; this approach may result in slower updates. .SH SEE ALSO \fB\%curses\fP(3X), \fB\%curs_initscr\fP(3X), \fB\%curs_refresh\fP(3X), \fB\%curs_touch\fP(3X), \fB\%curs_variables\fP(3X)