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73 lines
2.8 KiB
Markdown
73 lines
2.8 KiB
Markdown
% notcurses_stdplane(3)
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% nick black <nickblack@linux.com>
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% v2.4.99
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# NAME
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notcurses_stdplane - acquire the standard ncplane
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## SYNOPSIS
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**#include <notcurses/notcurses.h>**
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**struct ncplane* notcurses_stdplane(struct notcurses* ***nc***);**
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**const struct ncplane* notcurses_stdplane_const(const struct notcurses* ***nc***);**
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**static inline struct ncplane* notcurses_stddim_yx(struct notcurses* ***nc***, unsigned* restrict ***y***, unsigned* restrict ***x***);**
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**static inline const struct ncplane* notcurses_stddim_yx_const(const struct notcurses* ***nc***, unsigned* restrict ***y***, unsigned* restrict ***x***);**
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**int notcurses_enter_alternate_screen(struct notcurses* ***nc***);**
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**int notcurses_leave_alternate_screen(struct notcurses* ***nc***);**
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# DESCRIPTION
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**notcurses_stdplane** returns a handle to the standard ncplane for the context
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**nc**. The standard plane always exists, and is always the same size as the
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screen. It is an error to call **ncplane_destroy(3)**, **ncplane_resize(3)**,
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or **ncplane_move(3)** on the standard plane, but it can be freely moved
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along the z-axis.
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The standard plane's virtual cursor is initialized to its uppermost, leftmost
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cell unless **NCOPTION_PRESERVE_CURSOR** is provided (see
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**notcurses_init(3)**), in which case it is placed wherever the terminal's
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real cursor was at startup.
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**notcurses_stddim_yx** provides the same function, but also writes the
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dimensions of the standard plane (and thus the real drawable area) into any
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non-**NULL** parameters among **y** and **x**.
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**notcurses_stdplane_const** allows a **const notcurses** to be safely used.
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A resize event does not invalidate these references. They can be used until
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**notcurses_stop(3)** is called on the associated **nc**.
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**notcurses_enter_alternate_screen** and **notcurses_leave_alternate_screen**
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only have meaning if the terminal implements the "alternate screen" via the
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**smcup** and **rmcup** **terminfo(5)** capabilities (see the discussion of
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**NCOPTION_NO_ALTERNATE_SCREEN** in **notcurses_init(3)**). If not currently
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using the alternate screen, and assuming it is supported,
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**notcurses_enter_alternate_screen** will switch to the alternate screen. This
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redraws the contents, repositions the cursor, and usually makes scrollback
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unavailable. The standard plane will have scrolling disabled upon a move to
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the alternate plane.
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# RETURN VALUES
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**notcurses_enter_alternate_screen** will return -1 if the alternate screen
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is unavailable. Both it and **notcurses_leave_alternate_screen** will return
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-1 on an I/O failure.
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Other functions cannot fail when provided a valid **struct notcurses**. They
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will always return a valid pointer to the standard plane.
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# SEE ALSO
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**notcurses(3)**,
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**notcurses_init(3)**,
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**notcurses_plane(3)**,
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**notcurses_stop(3)**,
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**terminfo(5)**
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