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[hci] Allow tab key to be used to cycle through UI elements

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Add support for wraparound scrolling and allow the tab key to be used
to move forward through a list of elements, wrapping back around to
the beginning of the list on overflow.

This is mildly useful for a menu, and likely to be a strong user
expectation for an interactive form.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-06-20 12:21:57 -07:00
parent 76e0933d78
commit 122777f789
4 changed files with 87 additions and 34 deletions
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36
src/include/ipxe/jumpscroll.h
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@@ -9,6 +9,8 @@
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
/** A jump scroller */
struct jump_scroller {
/** Maximum number of visible rows */
@@ -21,6 +23,35 @@ struct jump_scroller {
unsigned int first;
};
/**
* Construct scroll movement
*
* @v delta Change in scroller position
* @ret move Scroll movement
*/
#define SCROLL( delta ) ( ( unsigned int ) ( uint16_t ) ( int16_t ) (delta) )
/**
* Extract change in scroller position
*
* @v move Scroll movement
* @ret delta Change in scroller position
*/
#define SCROLL_DELTA( scroll ) ( ( int16_t ) ( (scroll) & 0x0000ffffUL ) )
/** Scroll movement flags */
#define SCROLL_FLAGS 0xffff0000UL
#define SCROLL_WRAP 0x80000000UL /**< Wrap around scrolling */
/** Do not scroll */
#define SCROLL_NONE SCROLL ( 0 )
/** Scroll up by one line */
#define SCROLL_UP SCROLL ( -1 )
/** Scroll down by one line */
#define SCROLL_DOWN SCROLL ( +1 )
/**
* Check if jump scroller is currently on first page
*
@@ -43,8 +74,9 @@ 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 unsigned int jump_scroll_key ( struct jump_scroller *scroll, int key );
extern unsigned int jump_scroll_move ( struct jump_scroller *scroll,
unsigned int move );
extern int jump_scroll ( struct jump_scroller *scroll );
#endif /* _IPXE_JUMPSCROLL_H */