ncurses 5.5
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34 <TITLE>curs_touch 3x</TITLE>
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39 <H1>curs_touch 3x</H1>
40 <HR>
41 <PRE>
42 <!-- Manpage converted by man2html 3.0.1 -->
43 <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>                                           <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
44
45
46
47
48 </PRE>
49 <H2>NAME</H2><PRE>
50        <STRONG>touchwin</STRONG>, <STRONG>touchline</STRONG>, <STRONG>untouchwin</STRONG>, <STRONG>wtouchln</STRONG>, <STRONG>is_linetouched</STRONG>,
51        <STRONG>is_wintouched</STRONG> - <STRONG>curses</STRONG> refresh control routines
52
53
54 </PRE>
55 <H2>SYNOPSIS</H2><PRE>
56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
57        <STRONG>int</STRONG> <STRONG>touchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
58        <STRONG>int</STRONG> <STRONG>touchline(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>start,</STRONG> <STRONG>int</STRONG> <STRONG>count);</STRONG>
59        <STRONG>int</STRONG> <STRONG>untouchwin(WINDOW</STRONG> <STRONG>*win);</STRONG>
60        <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>
61        <STRONG>bool</STRONG> <STRONG>is_linetouched(WINDOW</STRONG> <STRONG>*win,</STRONG> <STRONG>int</STRONG> <STRONG>line);</STRONG>
62        <STRONG>bool</STRONG> <STRONG>is_wintouched(WINDOW</STRONG> <STRONG>*win);</STRONG>
63
64
65 </PRE>
66 <H2>DESCRIPTION</H2><PRE>
67        The <STRONG>touchwin</STRONG> and <STRONG>touchline</STRONG> routines throw away  all  opti-
68        mization  information about which parts of the window have
69        been touched, by pretending that  the  entire  window  has
70        been  drawn  on.   This  is sometimes necessary when using
71        overlapping windows, since a change to one window  affects
72        the other window, but the records of which lines have been
73        changed in the other window do  not  reflect  the  change.
74        The  routine <STRONG>touchline</STRONG> only pretends that <EM>count</EM> lines have
75        been changed, beginning with line <EM>start</EM>.
76
77        The <STRONG>untouchwin</STRONG> routine marks all lines in  the  window  as
78        unchanged since the last call to <STRONG>wrefresh</STRONG>.
79
80        The <STRONG>wtouchln</STRONG> routine makes <EM>n</EM> lines in the window, starting
81        at line <EM>y</EM>, look as if they have (<EM>changed</EM><STRONG>=1</STRONG>)  or  have  not
82        (<EM>changed</EM><STRONG>=0</STRONG>)  been changed since the last call to <STRONG>wrefresh</STRONG>.
83
84        The <STRONG>is_linetouched</STRONG> and <STRONG>is_wintouched</STRONG> routines return  <STRONG>TRUE</STRONG>
85        if  the  specified line/window was modified since the last
86        call to <STRONG>wrefresh</STRONG>; otherwise they return <STRONG>FALSE</STRONG>.   In  addi-
87        tion,  <STRONG>is_linetouched</STRONG> returns <STRONG>ERR</STRONG> if <EM>line</EM> is not valid for
88        the given window.
89
90
91 </PRE>
92 <H2>RETURN VALUE</H2><PRE>
93        All routines return the integer <STRONG>ERR</STRONG> upon  failure  and  an
94        integer  value  other than <STRONG>ERR</STRONG> upon successful completion,
95        unless otherwise noted in the preceding  routine  descrip-
96        tions.
97
98        X/Open  does not define any error conditions.  In this im-
99        plementation
100
101               <STRONG>is_linetouched</STRONG>
102                    returns an error  if  the  window  pointer  is
103                    null,  or  if  the  line number is outside the
104                    window.  Note that ERR is distinct  from  TRUE
105                    and  FALSE, which are the normal return values
106                    of this function.
107
108               <STRONG>wtouchln</STRONG>
109                    returns an error  if  the  window  pointer  is
110                    null,  or  if  the  line number is outside the
111                    window.
112
113
114 </PRE>
115 <H2>PORTABILITY</H2><PRE>
116        The XSI Curses standard, Issue  4  describes  these  func-
117        tions.
118
119        Some  historic  curses  implementations had, as an undocu-
120        mented feature,  the  ability  to  do  the  equivalent  of
121        <STRONG>clearok(...,</STRONG>  <STRONG>1)</STRONG>  by saying <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(std-</STRONG>
122        <STRONG>scr)</STRONG>.  This will not work under ncurses.
123
124
125 </PRE>
126 <H2>NOTES</H2><PRE>
127        Note that all routines except <STRONG>wtouchln</STRONG> may be macros.
128
129
130 </PRE>
131 <H2>SEE ALSO</H2><PRE>
132        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>.
133
134
135
136                                                          <STRONG><A HREF="curs_touch.3x.html">curs_touch(3x)</A></STRONG>
137 </PRE>
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