| .\"*************************************************************************** |
| .\" Copyright 2018-2021,2022 Thomas E. Dickey * |
| .\" Copyright 1998-2015,2017 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_touch.3x,v 1.26 2022/02/12 20:05:11 tom Exp $ |
| .TH curs_touch 3X "" |
| .na |
| .hy 0 |
| .SH NAME |
| \fBtouchwin\fP, |
| \fBtouchline\fP, |
| \fBuntouchwin\fP, |
| \fBwtouchln\fP, |
| \fBis_linetouched\fP, |
| \fBis_wintouched\fP \- \fBcurses\fP refresh control routines |
| .ad |
| .hy |
| .SH SYNOPSIS |
| \fB#include <curses.h>\fP |
| .sp |
| \fBint touchline(WINDOW *\fIwin\fB, int \fIstart\fB, int \fIcount\fB);\fR |
| .sp |
| \fBint touchwin(WINDOW *\fIwin\fB);\fR |
| .br |
| \fBint wtouchln(WINDOW *\fIwin\fB, int \fIy\fB, int \fIn\fB, int \fIchanged\fB);\fR |
| .sp |
| \fBint untouchwin(WINDOW *\fIwin\fB);\fR |
| .sp |
| \fBbool is_linetouched(WINDOW *\fIwin\fB, int \fIline\fB);\fR |
| .br |
| \fBbool is_wintouched(WINDOW *\fIwin\fB);\fR |
| .br |
| .SH DESCRIPTION |
| The \fBtouchwin\fP and \fBtouchline\fP routines throw away all |
| optimization information about which parts of the window have been |
| touched, by pretending that the entire window has been drawn on. |
| This |
| is sometimes necessary when using overlapping windows, since a change |
| to one window affects the other window, but the records of which lines |
| have been changed in the other window do not reflect the change. |
| The |
| routine \fBtouchline\fP only pretends that \fIcount\fP lines have been |
| changed, beginning with line \fIstart\fP. |
| .PP |
| The \fBuntouchwin\fP routine marks all lines in the window as unchanged since |
| the last call to \fBwrefresh\fP. |
| .PP |
| The \fBwtouchln\fP routine makes \fIn\fP lines in the window, starting |
| at line \fIy\fR, look as if they have (\fIchanged\fB=1\fR) or have |
| not (\fIchanged\fB=0\fR) been changed since the last call to |
| \fBwrefresh\fP. |
| .PP |
| The \fBis_linetouched\fP and \fBis_wintouched\fP routines return |
| \fBTRUE\fP if the specified line/window was modified since the last |
| call to \fBwrefresh\fP; otherwise they return \fBFALSE\fP. In |
| addition, \fBis_linetouched\fP returns \fBERR\fP if \fIline\fP is not |
| valid for the given window. |
| .SH RETURN VALUE |
| All routines return the integer \fBERR\fP upon failure and an integer value |
| other than \fBERR\fP upon successful completion, unless otherwise noted in the |
| preceding routine descriptions. |
| .PP |
| X/Open does not define any error conditions. |
| In this implementation |
| .RS 3 |
| .TP 5 |
| \fBis_linetouched\fP |
| returns an error |
| if the window pointer is null, or |
| if the line number is outside the window. |
| .IP |
| The constant \fBERR\fP is distinct from \fBTRUE\fP and \fBFALSE\fP, |
| which are the normal return values of this function. |
| Because the function returns a \fBbool\fP, |
| returning \fBERR\fP (which is neither \fBTRUE\fP nor \fBFALSE\fP) |
| may not be supported by the compiler. |
| .IP |
| To provide error-checking and also match the X/Open function prototype, |
| the \fBERR\fP is provided by a macro named \fBis_linetouched\fP. |
| The actual function returns \fBFALSE\fP when it detects an error. |
| .TP 5 |
| \fBwtouchln\fP |
| returns an error |
| if the window pointer is null, or |
| if the line number is outside the window. |
| .RE |
| .SH PORTABILITY |
| .PP |
| These functions were introduced by SVr4. |
| The Solaris curses header file, |
| for instance, defines both an actual function and macro for each. |
| The macros give the same result as the actual functions. |
| SVr4 curses does not check the window parameter \fIwin\fP to ensure |
| that it is not \fBNULL\fP; |
| otherwise this implementation behaves the same as SVr4. |
| .PP |
| The XSI Curses standard, Issue 4 describes these functions, |
| but defines no error conditions. |
| .SH NOTES |
| All of these routines except \fBwtouchln\fP may be macros. |
| .SH SEE ALSO |
| \fBcurses\fP(3X), |
| \fBcurs_refresh\fP(3X), |
| \fBcurs_variables\fP(3X). |