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These routines set options within curses that deal with output. All
options are initially #f
, unless otherwise stated. It is not
necessary to turn these options off before calling endwin
.
If enabled (bf is #t
), the next call to force-output
or refresh
with win will clear the screen completely and
redraw the entire screen from scratch. This is useful when the contents
of the screen are uncertain, or in some cases for a more pleasing visual
effect.
If enabled (bf is #t
), curses will consider using the
hardware “insert/delete-line” feature of terminals so equipped. If
disabled (bf is #f
), curses will very seldom use this
feature. The “insert/delete-character” feature is always considered.
This option should be enabled only if your application needs
“insert/delete-line”, for example, for a screen editor. It is
disabled by default because
“insert/delete-line” tends to be visually annoying when used in applications where it is not really needed. If “insert/delete-line” cannot be used, curses will redraw the changed portions of all lines.
Normally, the hardware cursor is left at the location of the window cursor being refreshed. This option allows the cursor to be left wherever the update happens to leave it. It is useful for applications where the cursor is not used, since it reduces the need for cursor motions. If possible, the cursor is made invisible when this option is enabled.
This option controls what happens when the cursor of window win is
moved off the edge of the window or scrolling region, either from a
newline on the bottom line, or typing the last character of the last
line. If disabled (bf is #f
), the cursor is left on the
bottom line at the location where the offending character was entered.
If enabled (bf is #t
), force-output
is called on the
window win, and then the physical terminal and window win
are scrolled up one line.
Note in order to get the physical scrolling effect on the
terminal, it is also necessary to call idlok
.
This option causes wgetch to be a non-blocking call. If no input is ready, wgetch will return an eof-object. If disabled, wgetch will hang until a key is pressed.
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