116 lines
5.4 KiB
Groff
116 lines
5.4 KiB
Groff
.TH curs_outopts 3X ""
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.SH NAME
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\fBcurs_outopts\fR: \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 - \fBncurses\fR output options
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.SH SYNOPSIS
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\fB#include <ncurses.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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\fBncurses\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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With the \fBclearok\fR routine, if enabled (\fIbf\fR is \fBTRUE\fR), 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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With the \fBidlok\fR routine, if enabled (\fIbf\fR is \fBTRUE\fR),
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\fBncurses\fR considers using the hardware insert/delete line feature of
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terminals so equipped. If disabled (\fIbf\fR is \fBFALSE\fR), \fBncurses\fR
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very seldom uses this feature. (The insert/delete character feature is always
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considered.) This option should be enabled only if the application needs
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insert/delete line, for example, for a screen editor. It is disabled by
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default because insert/delete line tends to be visually annoying when used in
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applications where it isn't really needed. If insert/delete line cannot be
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used, \fBncurses\fR redraws the changed portions of all lines.
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With the \fBidcok\fR routine, if enabled (\fIbf\fR is \fBTRUE\fR),
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\fBncurses\fR considers using the hardware insert/delete character feature of
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terminals so equipped. This is enabled by default.
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With the \fBimmedok\fR routine, if enabled (\fIbf\fR is \fBTRUE)\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 the 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 up one line. Only the text
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of the window is scrolled. (Note that this has nothing to do with the use of a
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physical scrolling region capability in the terminal, like that in the VT100.
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If \fBidlok\fR is enabled and the terminal has either a scrolling region or
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insert/delete line capability, they will probably be used by the output
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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), \fBwrefresh\fR is called on the
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window, and the physical terminal and window are scrolled up one line. [Note
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that in order to get the physical scrolling effect on the terminal, it is also
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necessary to call \fBidlok\fR.]
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The \fBnl\fR and \fBnonl\fR routines control whether newline is translated into
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carriage return and linefeed on output, and whether return is translated into
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newline on input. Initially, the translations do occur. By disabling these
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translations using \fBnonl\fR, \fBncurses\fR is able to make better use of the
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linefeed capability, resulting in faster cursor motion.
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.SH RETURN VALUE
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\fBsetscrreg\fR and \fBwsetscrreg\fR return \fBOK\fR upon success and \fBERR\fR upon failure.
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All other routines that return an integer always return \fBOK\fR.
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.SH BUGS
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The entry points \fBidcok\fR, \fBimmedok\fR are not yet implemented in
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ncurses 1.8.6. Setting \fIidlok\fR has unfortunate effects on scrolling
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windows.
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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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\fBncurses\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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