notcurses_progbar(3)

NAME
notcurses_progbar - high level widget for progress bars

SYNOPSIS
#include <notcurses/notcurses.h>

        struct ncprogbar;

        #define NCPROGBAR_OPTION_RETROGRADE        0x0001u // proceed left/down

        typedef struct ncprogbar_options {
          uint32_t ulchannel; // upper-left channel. in the context of a progress bar,
          uint32_t urchannel; // "up" is the direction we are progressing towards, and
          uint32_t blchannel; // "bottom" is the direction of origin. for monochromatic
          uint32_t brchannel; // bar, all four channels ought be the same.
          uint64_t flags;
        } ncprogbar_options;

struct ncprogbar* ncprogbar_create(struct ncplane* n, const ncprogbar_options* opts)

struct ncplane* ncprogbar_plane(struct ncprogbar* n)

int ncprogbar_set_progress(struct ncprogbar* n, double p)

double ncprogbar_progress(const struct ncprogbar* n)

void ncprogbar_destroy(struct ncprogbar* n)

DESCRIPTION
These functions draw progress bars in any of four directions. The progress measure is a double between zero and one, inclusive, provided to ncprogbar_set_progress. This will be scaled to the size of the provided ncplane n. The axis of progression is the longer element of the plane's geometry. Horizontal bars proceed to the right by default, and vertical bars proceed up. This can be changed with NCPROGBAR_OPTION_RETROGRADE.

NOTES
ncprogbar_create takes ownership of n in all cases. On failure, n will be destroyed immediately. It is otherwise destroyed by ncprogbar_destroy.

RETURN VALUES
ncprogbar_plane returns the ncplane on which the progress bar is drawn. ncprogbar_progress returns the current progress, a value between zero and one, inclusive. They cannot fail.

ncprogbar_set_progress returns -1 if p is less than zero or greater than one, or if there is an internal error redrawing the progress bar. It returns 0 otherwise.

BUGS
Whether progression is to the left or right by default probably ought be an aspect of the current locale.

SEE ALSO
notcurses(3), notcurses_plane(3), notcurses_visual(3)

AUTHORS
nick black nickblack@linux.com