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- #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 */
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