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30 * @Id: curs_touch.3x,v 1.8 2000/07/08 11:07:57 tom Exp @
34 <TITLE>curs_touch 3x</TITLE>
35 <link rev=made href="mailto:bug-ncurses@gnu.org">
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39 <H1>curs_touch 3x</H1>
42 <!-- Manpage converted by man2html 3.0.1 -->
46 <STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
47 <STRONG>is_wintouched</STRONG> - <STRONG>curses</STRONG> refresh control routines
51 <H2>SYNOPSIS</H2><PRE>
52 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
53 <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
54 <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
55 <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
56 <STRONG>int</STRONG> <STRONG>wtouchln(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>y,</STRONG> <STRONG>int</STRONG> <STRONG>n,</STRONG> <STRONG>int</STRONG> <STRONG>changed);</STRONG>
57 <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
58 <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
62 <H2>DESCRIPTION</H2><PRE>
63 The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away all opti-
64 mization information about which parts of the window have
65 been touched, by pretending that the entire window has
66 been drawn on. This is sometimes necessary when using
67 overlapping windows, since a change to one window affects
68 the other window, but the records of which lines have been
69 changed in the other window do not reflect the change.
70 The routine <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
71 been changed, beginning with line <EM>start</EM>.
73 The <STRONG>untouchwin</STRONG> routine marks all lines in the window as
74 unchanged since the last call to <STRONG>wrefresh</STRONG>.
76 The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting
77 at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>) or have not
78 (<EM>changed</EM><STRONG>=0</STRONG>) been changed since the last call to <STRONG>wrefresh</STRONG>.
80 The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return <STRONG>TRUE</STRONG>
81 if the specified line/window was modified since the last
82 call to <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>. In addi-
83 tion, <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid for
88 <H2>RETURN VALUE</H2><PRE>
89 All routines return the integer <STRONG>ERR</STRONG> upon failure and an
90 integer value other than <STRONG>ERR</STRONG> upon successful completion,
91 unless otherwise noted in the preceding routine descrip-
96 <H2>PORTABILITY</H2><PRE>
97 The XSI Curses standard, Issue 4 describes these func-
100 Some historic curses implementations had, as an undocu-
101 mented feature, the ability to do the equivalent of
102 <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
103 <STRONG>scr)</STRONG>. This will not work under ncurses.
108 Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
112 <H2>SEE ALSO</H2><PRE>
113 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>.
169 Man(1) output converted with
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