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42 <H1 class="no-header">curs_outopts 3x 2024-03-16 ncurses 6.4 Library calls</H1>
44 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> Library calls <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50 <STRONG>clearok</STRONG>, <STRONG>idlok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>immedok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>setscrreg</STRONG>, <STRONG>wsetscrreg</STRONG>,
51 <STRONG>scrollok</STRONG> - set <EM>curses</EM> output options
54 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
55 <STRONG>#include</STRONG> <STRONG><curses.h></STRONG>
57 <STRONG>int</STRONG> <STRONG>clearok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
58 <STRONG>int</STRONG> <STRONG>idlok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
59 <STRONG>void</STRONG> <STRONG>idcok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
60 <STRONG>void</STRONG> <STRONG>immedok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
61 <STRONG>int</STRONG> <STRONG>leaveok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
62 <STRONG>int</STRONG> <STRONG>scrollok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
64 <STRONG>int</STRONG> <STRONG>setscrreg(int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
65 <STRONG>int</STRONG> <STRONG>wsetscrreg(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
68 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
69 These routines set options that change the style of output within
70 <STRONG>curses</STRONG>. All options are initially <STRONG>FALSE</STRONG>, unless otherwise stated. It
71 is not necessary to turn these options off before calling <STRONG><A HREF="curs_initscr.3x.html">endwin(3x)</A></STRONG>.
74 </PRE><H3><a name="h3-clearok">clearok</a></H3><PRE>
75 If <STRONG>clearok</STRONG> is called with <STRONG>TRUE</STRONG> as argument, the next call to <STRONG>wrefresh</STRONG>
76 with this window will clear the screen completely and redraw the entire
77 screen from scratch. This is useful when the contents of the screen
78 are uncertain, or in some cases for a more pleasing visual effect. If
79 the <EM>win</EM> argument to <STRONG>clearok</STRONG> is the global variable <STRONG>curscr</STRONG>, the next
80 call to <STRONG>wrefresh</STRONG> with any window causes the screen to be cleared and
81 repainted from scratch.
84 </PRE><H3><a name="h3-idlok">idlok</a></H3><PRE>
85 If <STRONG>idlok</STRONG> is called with <STRONG>TRUE</STRONG> as second argument, <STRONG>curses</STRONG> considers using
86 the hardware insert/delete line feature of terminals so equipped.
87 Calling <STRONG>idlok</STRONG> with <STRONG>FALSE</STRONG> as second argument disables use of line
88 insertion and deletion. This option should be enabled only if the
89 application needs insert/delete line, for example, for a screen editor.
90 It is disabled by default because insert/delete line tends to be
91 visually annoying when used in applications where it is not really
92 needed. If insert/delete line cannot be used, <STRONG>curses</STRONG> redraws the
93 changed portions of all lines.
96 </PRE><H3><a name="h3-idcok">idcok</a></H3><PRE>
97 If <STRONG>idcok</STRONG> is called with <STRONG>FALSE</STRONG> as second argument, <STRONG>curses</STRONG> no longer
98 considers using the hardware insert/delete character feature of
99 terminals so equipped. Use of character insert/delete is enabled by
100 default. Calling <STRONG>idcok</STRONG> with <STRONG>TRUE</STRONG> as second argument re-enables use of
101 character insertion and deletion.
104 </PRE><H3><a name="h3-immedok">immedok</a></H3><PRE>
105 If <STRONG>immedok</STRONG> is called with <STRONG>TRUE</STRONG> as second argument, any change in the
106 window image, such as the ones caused by <STRONG>waddch,</STRONG> <STRONG>wclrtobot,</STRONG> <STRONG>wscrl</STRONG>,
107 etc., automatically causes a call to <STRONG>wrefresh</STRONG>. However, it may degrade
108 performance considerably, due to repeated calls to <STRONG>wrefresh</STRONG>. Calling
109 <STRONG>immedok</STRONG> with <STRONG>FALSE</STRONG> as second argument restores the default behavior,
110 i.e., deferring screen updates until a refresh is needed.
113 </PRE><H3><a name="h3-leaveok">leaveok</a></H3><PRE>
114 Normally, the hardware cursor is left at the location of the window
115 cursor being refreshed. The <STRONG>leaveok</STRONG> option allows the cursor to be
116 left wherever the update happens to leave it. It is useful for
117 applications where the cursor is not used, since it reduces the need
121 </PRE><H3><a name="h3-scrollok">scrollok</a></H3><PRE>
122 The <STRONG>scrollok</STRONG> option controls what happens when the cursor of a window
123 is moved off the edge of the window or scrolling region, either as a
124 result of a newline action on the bottom line, or typing the last
125 character of the last line. If disabled, (<EM>bf</EM> is <STRONG>FALSE</STRONG>), the cursor is
126 left on the bottom line. If enabled, (<EM>bf</EM> is <STRONG>TRUE</STRONG>), the window is
127 scrolled up one line (Note that to get the physical scrolling effect on
128 the terminal, it is also necessary to call <STRONG>idlok</STRONG>).
131 </PRE><H3><a name="h3-setscrreg_wsetscrreg">setscrreg, wsetscrreg</a></H3><PRE>
132 The <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> routines allow the application programmer
133 to set a software scrolling region in a window. The <EM>top</EM> and <EM>bot</EM>
134 parameters are the line numbers of the top and bottom margin of the
135 scrolling region. (Line 0 is the top line of the window.) If this
136 option and <STRONG>scrollok</STRONG> are enabled, an attempt to move off the bottom
137 margin line causes all lines in the scrolling region to scroll one line
138 in the direction of the first line. Only the text of the window is
139 scrolled. (Note that this has nothing to do with the use of a physical
140 scrolling region capability in the terminal, like that in the VT100.
141 If <STRONG>idlok</STRONG> is enabled and the terminal has either a scrolling region or
142 insert/delete line capability, they will probably be used by the output
146 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
147 The functions <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> return <STRONG>OK</STRONG> upon success and <STRONG>ERR</STRONG>
148 upon failure. All other routines that return an integer always return
151 X/Open Curses does not specify any error conditions.
153 In this implementation,
155 <STRONG>o</STRONG> those functions that have a window pointer will return an error if
156 the window pointer is null
158 <STRONG>o</STRONG> <STRONG>wsetscrreg</STRONG> returns an error if the scrolling region limits extend
161 X/Open Curses does not specify any error conditions. This
162 implementation returns an error if the window pointer is null.
165 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
166 Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, and <STRONG>setscrreg</STRONG> may be
169 The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal
173 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
174 These functions are described in the XSI Curses standard, Issue 4.
176 From the outset, <EM>ncurses</EM> used <STRONG>nl</STRONG>/<STRONG>nonl</STRONG> to control the conversion of
177 newlines to carriage return/line-feed on output as well as input. XSI
178 Curses documents only the use of these functions for input. This
179 difference arose from converting the <EM>pcurses</EM> source (which used <STRONG>ioctl</STRONG>
180 calls with the <STRONG>sgttyb</STRONG> structure) to termios (i.e., the POSIX terminal
181 interface). In the former, both input and output were controlled via a
182 single option <STRONG>CRMOD</STRONG>, while the latter separates these features.
183 Because that conversion interferes with output optimization, <STRONG>nl</STRONG>/<STRONG>nonl</STRONG>
184 were amended after <EM>ncurses</EM> 6.2 to eliminate their effect on output.
186 Some historic curses implementations had, as an undocumented feature,
187 the ability to do the equivalent of <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying
188 <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under <EM>ncurses</EM>.
190 Earlier System V curses implementations specified that with <STRONG>scrollok</STRONG>
191 enabled, any window modification triggering a scroll also forced a
192 physical refresh. XSI Curses does not require this, and <EM>ncurses</EM> avoids
193 doing it to perform better vertical-motion optimization at <STRONG>wrefresh</STRONG>
196 The XSI Curses standard does not mention that the cursor should be made
197 invisible as a side-effect of <STRONG>leaveok</STRONG>. SVr4 curses documentation does
198 this, but the code does not. Use <STRONG>curs_set</STRONG> to make the cursor
202 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
203 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_addch.3x.html">curs_addch(3x)</A></STRONG>, <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>, <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>,
204 <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>, <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>, <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>
208 ncurses 6.4 2024-03-16 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
212 <li><a href="#h2-NAME">NAME</a></li>
213 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
214 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
216 <li><a href="#h3-clearok">clearok</a></li>
217 <li><a href="#h3-idlok">idlok</a></li>
218 <li><a href="#h3-idcok">idcok</a></li>
219 <li><a href="#h3-immedok">immedok</a></li>
220 <li><a href="#h3-leaveok">leaveok</a></li>
221 <li><a href="#h3-scrollok">scrollok</a></li>
222 <li><a href="#h3-setscrreg_wsetscrreg">setscrreg, wsetscrreg</a></li>
225 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
226 <li><a href="#h2-NOTES">NOTES</a></li>
227 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
228 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>