diff options
Diffstat (limited to 'qemu/roms/ipxe/src/include/ipxe/jumpscroll.h')
-rw-r--r-- | qemu/roms/ipxe/src/include/ipxe/jumpscroll.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/include/ipxe/jumpscroll.h b/qemu/roms/ipxe/src/include/ipxe/jumpscroll.h new file mode 100644 index 000000000..7a5b111c1 --- /dev/null +++ b/qemu/roms/ipxe/src/include/ipxe/jumpscroll.h @@ -0,0 +1,50 @@ +#ifndef _IPXE_JUMPSCROLL_H +#define _IPXE_JUMPSCROLL_H + +/** @file + * + * Jump scrolling + * + */ + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +/** A jump scroller */ +struct jump_scroller { + /** Maximum number of visible rows */ + unsigned int rows; + /** Total number of items */ + unsigned int count; + /** Currently selected item */ + unsigned int current; + /** First visible item */ + unsigned int first; +}; + +/** + * Check if jump scroller is currently on first page + * + * @v scroll Jump scroller + * @ret is_first Scroller is currently on first page + */ +static inline int jump_scroll_is_first ( struct jump_scroller *scroll ) { + + return ( scroll->first == 0 ); +} + +/** + * Check if jump scroller is currently on last page + * + * @v scroll Jump scroller + * @ret is_last Scroller is currently on last page + */ +static inline int jump_scroll_is_last ( struct jump_scroller *scroll ) { + + return ( ( scroll->first + scroll->rows ) >= scroll->count ); +} + +extern int jump_scroll_key ( struct jump_scroller *scroll, int key ); +extern int jump_scroll_move ( struct jump_scroller *scroll, int move ); +extern int jump_scroll ( struct jump_scroller *scroll ); + +#endif /* _IPXE_JUMPSCROLL_H */ |