51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
#ifndef _IPXE_JUMPSCROLL_H
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#define _IPXE_JUMPSCROLL_H
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/** @file
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*
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* Jump scrolling
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/** A jump scroller */
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struct jump_scroller {
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/** Maximum number of visible rows */
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unsigned int rows;
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/** Total number of items */
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unsigned int count;
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/** Currently selected item */
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unsigned int current;
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/** First visible item */
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unsigned int first;
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};
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/**
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* Check if jump scroller is currently on first page
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*
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* @v scroll Jump scroller
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* @ret is_first Scroller is currently on first page
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*/
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static inline int jump_scroll_is_first ( struct jump_scroller *scroll ) {
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return ( scroll->first == 0 );
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}
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/**
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* Check if jump scroller is currently on last page
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*
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* @v scroll Jump scroller
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* @ret is_last Scroller is currently on last page
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*/
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static inline int jump_scroll_is_last ( struct jump_scroller *scroll ) {
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return ( ( scroll->first + scroll->rows ) >= scroll->count );
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}
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extern int jump_scroll_key ( struct jump_scroller *scroll, int key );
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extern int jump_scroll_move ( struct jump_scroller *scroll, int move );
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extern int jump_scroll ( struct jump_scroller *scroll );
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#endif /* _IPXE_JUMPSCROLL_H */
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