1998-03-01 12:21:12 +08:00
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.\" $Id: curs_outopts.3x,v 1.10 1998/02/07 21:56:39 tom Exp $
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1997-05-15 12:00:00 +08:00
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.TH curs_outopts 3X ""
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.SH NAME
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\fBclearok\fR, \fBidlok\fR, \fBidcok immedok\fR,
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\fBleaveok\fR, \fBsetscrreg\fR, \fBwsetscrreg\fR, \fBscrollok\fR,
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\fBnl\fR, \fBnonl\fR - \fBcurses\fR output options
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.SH SYNOPSIS
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\fB#include <curses.h>\fR
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\fBint clearok(WINDOW *win, bool bf);\fR
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.br
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\fBint idlok(WINDOW *win, bool bf);\fR
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.br
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\fBvoid idcok(WINDOW *win, bool bf);\fR
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.br
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\fBvoid immedok(WINDOW *win, bool bf);\fR
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.br
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\fBint leaveok(WINDOW *win, bool bf);\fR
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.br
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\fBint setscrreg(int top, int bot);\fR
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.br
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\fBint wsetscrreg(WINDOW *win, int top, int bot);\fR
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.br
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\fBint scrollok(WINDOW *win, bool bf);\fR
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.br
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\fBint nl(void);\fR
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.br
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\fBint nonl(void);\fR
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.br
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.SH DESCRIPTION
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These routines set options that change the style of output within
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\fBcurses\fR. All options are initially \fBFALSE\fR, unless otherwise stated.
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It is not necessary to turn these options off before calling \fBendwin\fR.
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If \fBclearok\fR is called with \fBTRUE\fR as argument, the next
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call to \fBwrefresh\fR with this window will clear the screen completely and
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redraw the entire screen from scratch. This is useful when the contents of the
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screen are uncertain, or in some cases for a more pleasing visual effect. If
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the \fIwin\fR argument to \fBclearok\fR is the global variable \fBcurscr\fR,
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the next call to \fBwrefresh\fR with any window causes the screen to be cleared
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and repainted from scratch.
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If \fBidlok\fR is called with \fBTRUE\fR as second argument, \fBcurses\fR
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considers using the hardware insert/delete line feature of terminals so
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equipped. Calling \fBidlok\fR with \fBFALSE\fR as second argument disables use
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of line insertion and deletion. This option should be enabled only if the
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application needs insert/delete line, for example, for a screen editor. It is
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disabled by default because insert/delete line tends to be visually annoying
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when used in applications where it isn't really needed. If insert/delete line
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cannot be used, \fBcurses\fR redraws the changed portions of all lines.
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If \fBidcok\fR is called with \fBFALSE\fR as second argument, \fBcurses\fR
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no longer considers using the hardware insert/delete character feature of
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terminals so equipped. Use of character insert/delete is enabled by default.
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Calling \fBidcok\fR with \fBTRUE\fR as second argument re-enables use
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of character insertion and deletion.
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If \fBimmedok\fR is called with \fBTRUE as argument\fR, any change
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in the window image, such as the ones caused by \fBwaddch, wclrtobot, wscrl\fR,
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\fIetc\fR., automatically cause a call to \fBwrefresh\fR. However, it may
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degrade performance considerably, due to repeated calls to \fBwrefresh\fR.
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It is disabled by default.
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Normally, the hardware cursor is left at the location of the window cursor
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being refreshed. The \fBleaveok\fR option allows the cursor to be left
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wherever the update happens to leave it. It is useful for applications where
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the cursor is not used, since it reduces the need for cursor motions. If
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possible, the cursor is made invisible when this option is enabled.
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The \fBsetscrreg\fR and \fBwsetscrreg\fR routines allow the application
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programmer to set a software scrolling region in a window. \fItop\fR and
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\fIbot\fR are the line numbers of the top and bottom margin of the scrolling
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region. (Line 0 is the top line of the window.) If this option and
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\fBscrollok\fR are enabled, an attempt to move off the bottom margin line
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causes all lines in the scrolling region to scroll one line in the direction
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of the first line. Only the text of the window is scrolled. (Note that this
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has nothing to do with the use of a physical scrolling region capability in the
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terminal, like that in the VT100. If \fBidlok\fR is enabled and the terminal
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has either a scrolling region or insert/delete line capability, they will
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probably be used by the output routines.)
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The \fBscrollok\fR option controls what happens when the cursor of a window is
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moved off the edge of the window or scrolling region, either as a result of a
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newline action on the bottom line, or typing the last character of the last
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line. If disabled, (\fIbf\fR is \fBFALSE\fR), the cursor is left on the bottom
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line. If enabled, (\fIbf\fR is \fBTRUE\fR), the window is scrolled up one line
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(Note that in order to get the physical scrolling effect on the terminal, it is
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also necessary to call \fBidlok\fR).
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The \fBnl\fR and \fBnonl\fR routines control whether the underlying display
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device translates the return key into newline on input, and whether it
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translates newline into return and line-feed on output (in either case, the
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call \fBaddch('\n')\fR does the equivalent of return and line feed on the
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virtual screen). Initially, these translations do occur. If you disable them
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using \fBnonl\fR, \fBcurses\fR will be able to make better use of the line-feed
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capability, resulting in faster cursor motion. Also, \fBcurses\fR will then be
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able to detect the return key.
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.SH RETURN VALUE
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The functions \fBsetscrreg\fR and \fBwsetscrreg\fR return \fBOK\fR upon success
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and \fBERR\fR upon failure. All other routines that return an integer always
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return \fBOK\fR.
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.SH PORTABILITY
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These functions are described in the XSI Curses standard, Issue 4.
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The XSI Curses standard is ambiguous on the question of whether \fBraw\fR()
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should disable the CRLF translations controlled by \fBnl\fR() and \fBnonl\fR().
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BSD curses did turn off these translations; AT&T curses (at least as late as
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SVr1) did not. We choose to do so, on the theory that a programmer requesting
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raw input wants a clean (ideally 8-bit clean) connection that the operating
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system does not mess with.
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Some historic curses implementations had, as an undocumented feature, the
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ability to do the equivalent of \fBclearok(..., 1)\fR by saying
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\fBtouchwin(stdscr)\fR or \fBclear(stdscr)\fR. This will not work under
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ncurses.
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Earlier System V curses implementations specified that with \fBscrollok\fR
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enabled, any window modification triggering a scroll also forced a physical
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refresh. XSI Curses does not require this, and \fBncurses\fR avoids doing
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it in order to perform better vertical-motion optimization at \fBwrefresh\fR
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time.
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1998-03-01 12:21:12 +08:00
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The XSI Curses standard does not mention that the cursor should be
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made invisible as a side-effect of \fBleaveok\fR.
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SVr4 curses does this.
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1997-05-15 12:00:00 +08:00
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.SH NOTES
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Note that \fBclearok\fR, \fBleaveok\fR, \fBscrollok\fR, \fBidcok\fR, \fBnl\fR,
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\fBnonl\fR and \fBsetscrreg\fR may be macros.
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The \fBimmedok\fR routine is useful for windows that are used as terminal
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emulators.
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.SH SEE ALSO
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\fBcurses\fR(3X), \fBcurs_addch\fR(3X), \fBcurs_clear\fR(3X),
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\fBcurs_initscr\fR(3X), \fBcurs_scroll\fR(3X), \fBcurs_refresh\fR(3X)
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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