release/src/router/libncurses/doc/html/man/curs_outopts.3x.html

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  41 <H1 class="no-header">curs_outopts 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>                                       <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <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>,
  51        <STRONG>wsetscrreg</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG> - <STRONG>curses</STRONG> output options
  52
  53
  54 </PRE>
  55 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  56        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>clearok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>idlok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  60        <STRONG>void</STRONG> <STRONG>idcok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  61        <STRONG>void</STRONG> <STRONG>immedok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  62        <STRONG>int</STRONG> <STRONG>leaveok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>setscrreg(int</STRONG> <EM>top</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>bot</EM><STRONG>);</STRONG>
  64        <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>
  65        <STRONG>int</STRONG> <STRONG>scrollok(WINDOW</STRONG> <STRONG>*</STRONG><EM>win</EM><STRONG>,</STRONG> <STRONG>bool</STRONG> <EM>bf</EM><STRONG>);</STRONG>
  66        <STRONG>int</STRONG> <STRONG>nl(void);</STRONG>
  67        <STRONG>int</STRONG> <STRONG>nonl(void);</STRONG>
  68
  69
  70 </PRE>
  71 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  72        These routines set options that change the style of output
  73        within  <STRONG>curses</STRONG>.   All  options are initially <STRONG>FALSE</STRONG>, unless
  74        otherwise stated.  It is not necessary to turn  these  op-
  75        tions off before calling <STRONG>endwin</STRONG>.
  76
  77
  78 </PRE>
  79 <H3><a name="h3-clearok">clearok</a></H3><PRE>
  80        If  <STRONG>clearok</STRONG> is called with <STRONG>TRUE</STRONG> as argument, the next call
  81        to <STRONG>wrefresh</STRONG> with this window will clear  the  screen  com-
  82        pletely  and  redraw the entire screen from scratch.  This
  83        is useful when the contents of the screen  are  uncertain,
  84        or  in  some  cases for a more pleasing visual effect.  If
  85        the <EM>win</EM> argument to <STRONG>clearok</STRONG> is the global variable <STRONG>curscr</STRONG>,
  86        the  next  call  to  <STRONG>wrefresh</STRONG>  with  any window causes the
  87        screen to be cleared and repainted from scratch.
  88
  89
  90 </PRE>
  91 <H3><a name="h3-idlok">idlok</a></H3><PRE>
  92        If <STRONG>idlok</STRONG> is called with <STRONG>TRUE</STRONG> as  second  argument,  <STRONG>curses</STRONG>
  93        considers using the hardware insert/delete line feature of
  94        terminals so equipped.  Calling <STRONG>idlok</STRONG> with <STRONG>FALSE</STRONG> as second
  95        argument  disables  use  of  line  insertion and deletion.
  96        This option should be  enabled  only  if  the  application
  97        needs  insert/delete  line, for example, for a screen edi-
  98        tor.  It is disabled by default because insert/delete line
  99        tends  to  be  visually annoying when used in applications
 100        where it is not really needed.  If insert/delete line can-
 101        not  be  used,  <STRONG>curses</STRONG> redraws the changed portions of all
 102        lines.
 103
 104
 105 </PRE>
 106 <H3><a name="h3-idcok">idcok</a></H3><PRE>
 107        If <STRONG>idcok</STRONG> is called with <STRONG>FALSE</STRONG> as second  argument,  <STRONG>curses</STRONG>
 108        no longer considers using the hardware insert/delete char-
 109        acter feature of terminals so equipped.  Use of  character
 110        insert/delete  is  enabled by default.  Calling <STRONG>idcok</STRONG> with
 111        <STRONG>TRUE</STRONG> as second argument re-enables use of character inser-
 112        tion and deletion.
 113
 114
 115 </PRE>
 116 <H3><a name="h3-immedok">immedok</a></H3><PRE>
 117        If  <STRONG>immedok</STRONG> is called with <STRONG>TRUE</STRONG> <STRONG>as</STRONG> <STRONG>argument</STRONG>, any change in
 118        the window image, such as the ones caused by <STRONG>waddch,</STRONG> <STRONG>wclr-</STRONG>
 119        <STRONG>tobot,</STRONG>  <STRONG>wscrl</STRONG>,  etc.,  automatically  cause a call to <STRONG>wre-</STRONG>
 120        <STRONG>fresh</STRONG>.  However, it may degrade performance  considerably,
 121        due  to repeated calls to <STRONG>wrefresh</STRONG>.  It is disabled by de-
 122        fault.
 123
 124
 125 </PRE>
 126 <H3><a name="h3-leaveok">leaveok</a></H3><PRE>
 127        Normally, the hardware cursor is left at the  location  of
 128        the window cursor being refreshed.  The <STRONG>leaveok</STRONG> option al-
 129        lows the cursor to be left wherever the update happens  to
 130        leave  it.  It is useful for applications where the cursor
 131        is not used, since it reduces the need for cursor motions.
 132
 133
 134 </PRE>
 135 <H3><a name="h3-setscrreg">setscrreg</a></H3><PRE>
 136        The <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> routines allow  the  applica-
 137        tion  programmer  to  set a software scrolling region in a
 138        window.  The <EM>top</EM> and <EM>bot</EM> parameters are the  line  numbers
 139        of  the  top  and  bottom  margin of the scrolling region.
 140        (Line 0 is the top line of the window.)   If  this  option
 141        and  <STRONG>scrollok</STRONG> are enabled, an attempt to move off the bot-
 142        tom margin line causes all lines in the  scrolling  region
 143        to  scroll  one  line  in the direction of the first line.
 144        Only the text of the window is scrolled.  (Note that  this
 145        has nothing to do with the use of a physical scrolling re-
 146        gion capability in the terminal, like that in  the  VT100.
 147        If  <STRONG>idlok</STRONG>  is  enabled  and  the  terminal  has  either  a
 148        scrolling region or insert/delete  line  capability,  they
 149        will probably be used by the output routines.)
 150
 151
 152 </PRE>
 153 <H3><a name="h3-scrollok">scrollok</a></H3><PRE>
 154        The  <STRONG>scrollok</STRONG> option controls what happens when the cursor
 155        of a window is  moved  off  the  edge  of  the  window  or
 156        scrolling  region,  either as a result of a newline action
 157        on the bottom line, or typing the last  character  of  the
 158        last line.  If disabled, (<EM>bf</EM> is <STRONG>FALSE</STRONG>), the cursor is left
 159        on the bottom line.  If enabled, (<EM>bf</EM> is <STRONG>TRUE</STRONG>), the  window
 160        is  scrolled  up  one  line (Note that to get the physical
 161        scrolling effect on the terminal, it is also necessary  to
 162        call <STRONG>idlok</STRONG>).
 163
 164
 165 </PRE>
 166 <H3><a name="h3-nl_-nonl">nl, nonl</a></H3><PRE>
 167        The  <STRONG>nl</STRONG>  and  <STRONG>nonl</STRONG> routines control whether the underlying
 168        display device translates the return key into  newline  on
 169        input,  and  whether it translates newline into return and
 170        line-feed on output (in either case, the call  <STRONG>addch('\n')</STRONG>
 171        does the equivalent of return and line feed on the virtual
 172        screen).  Initially, these translations do occur.  If  you
 173        disable  them using <STRONG>nonl</STRONG>, <STRONG>curses</STRONG> will be able to make bet-
 174        ter use of the line-feed capability, resulting  in  faster
 175        cursor  motion.   Also, <STRONG>curses</STRONG> will then be able to detect
 176        the return key.
 177
 178
 179 </PRE>
 180 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 181        The functions <STRONG>setscrreg</STRONG> and <STRONG>wsetscrreg</STRONG> return <STRONG>OK</STRONG> upon suc-
 182        cess and <STRONG>ERR</STRONG> upon failure.  All other routines that return
 183        an integer always return <STRONG>OK</STRONG>.
 184
 185        X/Open Curses does not define any error conditions.
 186
 187        In this implementation, those functions that have a window
 188        pointer  will  return  an  error  if the window pointer is
 189        null.
 190
 191               <STRONG>wclrtoeol</STRONG>
 192                    returns an error if  the  cursor  position  is
 193                    about to wrap.
 194
 195               <STRONG>wsetscrreg</STRONG>
 196                    returns  an error if the scrolling region lim-
 197                    its extend outside the window.
 198
 199        X/Open does not define any error conditions.  This  imple-
 200        mentation returns an error if the window pointer is null.
 201
 202
 203 </PRE>
 204 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 205        These  functions are described in the XSI Curses standard,
 206        Issue 4.
 207
 208        The XSI Curses standard is ambiguous on  the  question  of
 209        whether  <STRONG>raw</STRONG>()  should  disable the CRLF translations con-
 210        trolled by <STRONG>nl</STRONG>() and <STRONG>nonl</STRONG>().  BSD curses did turn off these
 211        translations;  AT&amp;T  curses (at least as late as SVr1) did
 212        not.  We choose to do so, on the theory that a  programmer
 213        requesting  raw  input wants a clean (ideally 8-bit clean)
 214        connection that the operating system will not alter.
 215
 216        Some historic curses implementations had,  as  an  undocu-
 217        mented  feature,  the  ability  to  do  the  equivalent of
 218        <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG>  or  <STRONG>clear(std-</STRONG>
 219        <STRONG>scr)</STRONG>.  This will not work under ncurses.
 220
 221        Earlier  System  V  curses  implementations specified that
 222        with <STRONG>scrollok</STRONG> enabled, any window modification  triggering
 223        a  scroll also forced a physical refresh.  XSI Curses does
 224        not require this, and <STRONG>ncurses</STRONG> avoids doing it  to  perform
 225        better vertical-motion optimization at <STRONG>wrefresh</STRONG> time.
 226
 227        The  XSI  Curses standard does not mention that the cursor
 228        should be made invisible  as  a  side-effect  of  <STRONG>leaveok</STRONG>.
 229        SVr4  curses  documentation  does  this, but the code does
 230        not.  Use <STRONG>curs_set</STRONG> to make the cursor invisible.
 231
 232
 233 </PRE>
 234 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
 235        Note that <STRONG>clearok</STRONG>, <STRONG>leaveok</STRONG>, <STRONG>scrollok</STRONG>, <STRONG>idcok</STRONG>, <STRONG>nl</STRONG>, <STRONG>nonl</STRONG>  and
 236        <STRONG>setscrreg</STRONG> may be macros.
 237
 238        The <STRONG>immedok</STRONG> routine is useful for windows that are used as
 239        terminal emulators.
 240
 241
 242 </PRE>
 243 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 244        <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>,
 245        <STRONG><A HREF="curs_initscr.3x.html">curs_initscr(3x)</A></STRONG>, <STRONG><A HREF="curs_scroll.3x.html">curs_scroll(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>,
 246        <STRONG><A HREF="curs_variables.3x.html">curs_variables(3x)</A></STRONG>.
 247
 248
 249
 250                                                        <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>
 251 </PRE>
 252 <div class="nav">
 253 <ul>
 254 <li><a href="#h2-NAME">NAME</a></li>
 255 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 256 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 257 <ul>
 258 <li><a href="#h3-clearok">clearok</a></li>
 259 <li><a href="#h3-idlok">idlok</a></li>
 260 <li><a href="#h3-idcok">idcok</a></li>
 261 <li><a href="#h3-immedok">immedok</a></li>
 262 <li><a href="#h3-leaveok">leaveok</a></li>
 263 <li><a href="#h3-setscrreg">setscrreg</a></li>
 264 <li><a href="#h3-scrollok">scrollok</a></li>
 265 <li><a href="#h3-nl_-nonl">nl, nonl</a></li>
 266 </ul>
 267 </li>
 268 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 269 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 270 <li><a href="#h2-NOTES">NOTES</a></li>
 271 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 272 </ul>
 273 </div>
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