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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>. 72 73 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. 82 83 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. 94 95 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. 102 103 104</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. 111 112 113</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 118 for cursor motions. 119 120 121</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>). 129 130 131</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 143 routines.) 144 145 146</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 149 <STRONG>OK</STRONG>. 150 151 X/Open Curses does not specify any error conditions. 152 153 In this implementation, 154 155 <STRONG>o</STRONG> those functions that have a window pointer will return an error if 156 the window pointer is null 157 158 <STRONG>o</STRONG> <STRONG>wsetscrreg</STRONG> returns an error if the scrolling region limits extend 159 outside the window boundaries. 160 161 162</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE> 163 Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, and <STRONG>setscrreg</STRONG> may be 164 macros. 165 166 The <STRONG>immedok</STRONG> routine is useful for windows that are used as terminal 167 emulators. 168 169 170</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE> 171 These functions are described in X/Open Curses, Issue 4. 172 173 Some historic curses implementations had, as an undocumented feature, 174 the ability to do the equivalent of <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying 175 <STRONG>touchwin(stdscr)</STRONG> or <STRONG>clear(stdscr)</STRONG>. This will not work under <EM>ncurses</EM>. 176 177 Earlier System V curses implementations specified that with <STRONG>scrollok</STRONG> 178 enabled, any window modification triggering a scroll also forced a 179 physical refresh. X/Open Curses does not require this, and <EM>ncurses</EM> 180 avoids doing it to perform better vertical-motion optimization at 181 <STRONG>wrefresh</STRONG> time. 182 183 X/Open Curses does not mention that the cursor should be made invisible 184 as a side-effect of <STRONG>leaveok</STRONG>. SVr4 curses documentation does this, but 185 the code does not. Use <STRONG>curs_set</STRONG> to make the cursor invisible. 186 187 188</PRE><H2><a name="h2-HISTORY">HISTORY</a></H2><PRE> 189 <EM>ncurses</EM> formerly treated <STRONG><A HREF="curs_inopts.3x.html">nl(3x)</A></STRONG> and <STRONG><A HREF="curs_inopts.3x.html">nonl(3x)</A></STRONG> as both input <EM>and</EM> output 190 options, but no longer; see <STRONG><A HREF="curs_inopts.3x.html">curs_inopts(3x)</A></STRONG>. 191 192 193</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE> 194 <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>, 195 <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> 196 197 198 199ncurses 6.5 2024-04-20 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG> 200</PRE> 201<div class="nav"> 202<ul> 203<li><a href="#h2-NAME">NAME</a></li> 204<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li> 205<li><a href="#h2-DESCRIPTION">DESCRIPTION</a> 206<ul> 207<li><a href="#h3-clearok">clearok</a></li> 208<li><a href="#h3-idlok">idlok</a></li> 209<li><a href="#h3-idcok">idcok</a></li> 210<li><a href="#h3-immedok">immedok</a></li> 211<li><a href="#h3-leaveok">leaveok</a></li> 212<li><a href="#h3-scrollok">scrollok</a></li> 213<li><a href="#h3-setscrreg_wsetscrreg">setscrreg, wsetscrreg</a></li> 214</ul> 215</li> 216<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li> 217<li><a href="#h2-NOTES">NOTES</a></li> 218<li><a href="#h2-PORTABILITY">PORTABILITY</a></li> 219<li><a href="#h2-HISTORY">HISTORY</a></li> 220<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li> 221</ul> 222</div> 223</BODY> 224</HTML> 225