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29 .\" $Id: curs_touch.3x,v 1.16 2015/12/05 23:43:00 tom Exp $
39 \fBis_wintouched\fR \- \fBcurses\fR refresh control routines
43 \fB#include <curses.h>\fR
45 \fBint touchwin(WINDOW *win);\fR
47 \fBint touchline(WINDOW *win, int start, int count);\fR
49 \fBint untouchwin(WINDOW *win);\fR
51 \fBint wtouchln(WINDOW *win, int y, int n, int changed);\fR
53 \fBbool is_linetouched(WINDOW *win, int line);\fR
55 \fBbool is_wintouched(WINDOW *win);\fR
58 The \fBtouchwin\fR and \fBtouchline\fR routines throw away all
59 optimization information about which parts of the window have been
60 touched, by pretending that the entire window has been drawn on. This
61 is sometimes necessary when using overlapping windows, since a change
62 to one window affects the other window, but the records of which lines
63 have been changed in the other window do not reflect the change. The
64 routine \fBtouchline\fR only pretends that \fIcount\fR lines have been
65 changed, beginning with line \fIstart\fR.
67 The \fBuntouchwin\fR routine marks all lines in the window as unchanged since
68 the last call to \fBwrefresh\fR.
70 The \fBwtouchln\fR routine makes \fIn\fR lines in the window, starting
71 at line \fIy\fR, look as if they have (\fIchanged\fR\fB=1\fR) or have
72 not (\fIchanged\fR\fB=0\fR) been changed since the last call to
75 The \fBis_linetouched\fR and \fBis_wintouched\fR routines return
76 \fBTRUE\fR if the specified line/window was modified since the last
77 call to \fBwrefresh\fR; otherwise they return \fBFALSE\fR. In
78 addition, \fBis_linetouched\fR returns \fBERR\fR if \fIline\fR is not
79 valid for the given window.
81 All routines return the integer \fBERR\fR upon failure and an integer value
82 other than \fBERR\fR upon successful completion, unless otherwise noted in the
83 preceding routine descriptions.
85 X/Open does not define any error conditions.
86 In this implementation
91 if the window pointer is null, or
92 if the line number is outside the window.
93 Note that ERR is distinct from \fBTRUE\fP and \fBFALSE\fP, which are the normal return values of this function.
97 if the window pointer is null, or
98 if the line number is outside the window.
101 The XSI Curses standard, Issue 4 describes these functions.
103 Some historic curses implementations had, as an undocumented feature, the
104 ability to do the equivalent of \fBclearok(..., 1)\fR by saying
105 \fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR. This will not work under
108 Note that all routines except \fBwtouchln\fR may be macros.
111 \fBcurs_refresh\fR(3X),
112 \fBcurs_variables\fR(3X).