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source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/MenuLoop.asm @ 58

Last change on this file since 58 was 58, checked in by aitotat, 13 years ago

Changes to Assembly Library:

Exiting menu with ESC can now be canceled.

File size: 5.0 KB

Rev	Line
[41]	1	; File name : MenuLoop.asm
	2	; Project name : Assembly Library
	3	; Created date : 22.7.2010
[58]	4	; Last update : 18.10.2010
[41]	5	; Author : Tomi Tilli
	6	; Description : Menu loop for waiting keystrokes.
	7
	8	; Section containing code
	9	SECTION .text
	10
	11	;--------------------------------------------------------------------
	12	; MenuLoop_Enter
	13	; Parameters
	14	; SS:BP: Ptr to MENU
	15	; Returns:
	16	; Nothing
	17	; Corrupts registers:
	18	; AX, BX, CX, DX, SI, DI
	19	;--------------------------------------------------------------------
	20	ALIGN JUMP_ALIGN
	21	MenuLoop_Enter:
[58]	22	call KeystrokeProcessing
	23	call TimeoutProcessing
	24	call IdleTimeProcessing
[41]	25	test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT
	26	jz SHORT MenuLoop_Enter
[58]	27	ret
[41]	28
	29
	30	;--------------------------------------------------------------------
	31	; IdleTimeProcessing
[58]	32	; TimeoutProcessing
	33	; KeystrokeProcessing
[41]	34	; Parameters
	35	; SS:BP: Ptr to MENU
	36	; Returns:
	37	; Nothing
	38	; Corrupts registers:
[58]	39	; All, except SS:BP
[41]	40	;--------------------------------------------------------------------
	41	ALIGN JUMP_ALIGN
	42	IdleTimeProcessing:
[58]	43	jmp MenuEvent_IdleProcessing ; User idle processing
[41]	44
[58]	45	ALIGN JUMP_ALIGN
	46	TimeoutProcessing:
	47	call MenuTime_UpdateSelectionTimeout
	48	mov ah, MENU_KEY_ENTER ; Fake ENTER to select item
	49	jc SHORT ProcessKeystrokeFromAX ; Process faked ENTER
	50	ret
[41]	51
[58]	52	ALIGN JUMP_ALIGN
	53	KeystrokeProcessing:
	54	call Keyboard_GetKeystrokeToAX
	55	jnz SHORT ProcessKeystrokeFromAX
	56	ret
	57
	58
[41]	59	;--------------------------------------------------------------------
	60	; ProcessKeystrokeFromAX
	61	; Parameters
	62	; AL: ASCII character
	63	; AH: BIOS scan code
	64	; SS:BP: Ptr to MENU
	65	; Returns:
	66	; Nothing
	67	; Corrupts registers:
	68	; AX, BX, CX, DX, SI, DI
	69	;--------------------------------------------------------------------
	70	ALIGN JUMP_ALIGN
	71	ProcessKeystrokeFromAX:
	72	call .ProcessMenuSystemKeystroke
	73	jc SHORT .Return
	74	jmp MenuEvent_KeyStrokeInAX
	75	ALIGN JUMP_ALIGN, ret
	76	.Return:
	77	ret
	78
	79	;--------------------------------------------------------------------
	80	; .ProcessMenuSystemKeystroke
	81	; Parameters
	82	; AL: ASCII character
	83	; AH: BIOS scan code
	84	; SS:BP: Ptr to MENU
	85	; Returns:
	86	; CF: Set if keystroke processed
	87	; Cleared if keystroke not processed
	88	; AL: ASCII character (if CF cleared)
	89	; AH: BIOS scan code (if CF cleared)
	90	; Corrupts registers:
	91	; BX, CX, DX, SI, DI
	92	;--------------------------------------------------------------------
	93	ALIGN JUMP_ALIGN
	94	.ProcessMenuSystemKeystroke:
	95	cmp ah, MENU_KEY_ESC
	96	je SHORT .LeaveMenuWithoutSelectingItem
	97	cmp ah, MENU_KEY_ENTER
	98	je SHORT .SelectItem
	99
	100	test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING
	101	jz SHORT MenuLoop_ProcessScrollingKeysFromAX
	102	clc ; Clear CF since keystroke not processed
	103	ret
	104
	105	ALIGN JUMP_ALIGN
	106	.LeaveMenuWithoutSelectingItem:
[58]	107	call MenuEvent_ExitMenu
	108	jnc SHORT .CancelMenuExit
[41]	109	call MenuInit_CloseMenuWindow
[52]	110	mov WORD [bp+MENUINIT.wHighlightedItem], NO_ITEM_HIGHLIGHTED
[58]	111	.CancelMenuExit:
[41]	112	stc
	113	ret
	114
	115	ALIGN JUMP_ALIGN
	116	.SelectItem:
[52]	117	mov cx, [bp+MENUINIT.wHighlightedItem]
[41]	118	call MenuEvent_ItemSelectedFromCX
	119	stc
	120	ret
	121
	122
	123	;--------------------------------------------------------------------
	124	; MenuLoop_ProcessScrollingKeysFromAX
	125	; Parameters
	126	; AL: ASCII character
	127	; AH: BIOS scan code
	128	; SS:BP: Ptr to MENU
	129	; Returns:
	130	; CF: Set if keystroke processed
	131	; Cleared if keystroke not processed
	132	; AL: ASCII character (if CF cleared)
	133	; AH: BIOS scan code (if CF cleared)
	134	; Corrupts registers:
	135	; BX, CX, DX, SI, DI
	136	;--------------------------------------------------------------------
	137	ALIGN JUMP_ALIGN
	138	MenuLoop_ProcessScrollingKeysFromAX:
	139	cmp ah, MENU_KEY_PGUP
	140	je SHORT .ChangeToPreviousPage
	141	cmp ah, MENU_KEY_PGDN
	142	je SHORT .ChangeToNextPage
	143	cmp ah, MENU_KEY_HOME
	144	je SHORT .SelectFirstItem
	145	cmp ah, MENU_KEY_END
	146	je SHORT .SelectLastItem
	147
	148	cmp ah, MENU_KEY_UP
	149	je SHORT .DecrementSelectedItem
	150	cmp ah, MENU_KEY_DOWN
	151	je SHORT .IncrementSelectedItem
	152	clc ; Clear CF since keystroke not processed
	153	ret
	154
	155	ALIGN JUMP_ALIGN
	156	.ChangeToPreviousPage:
	157	call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
	158	xchg ax, cx
	159	neg ax
[52]	160	mov cx, [bp+MENUINIT.wHighlightedItem]
[41]	161	add cx, ax
	162	jge SHORT .MoveHighlightedItemByAX ; No rotation for PgUp
	163	; Fall to .SelectFirstItem
	164	ALIGN JUMP_ALIGN
	165	.SelectFirstItem:
[52]	166	mov ax, [bp+MENUINIT.wHighlightedItem]
[41]	167	neg ax
	168	jmp SHORT .MoveHighlightedItemByAX
	169
	170	ALIGN JUMP_ALIGN
	171	.ChangeToNextPage:
	172	call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
	173	xchg ax, cx
[52]	174	mov cx, [bp+MENUINIT.wHighlightedItem]
[41]	175	add cx, ax
	176	cmp cx, [bp+MENUINIT.wItems]
	177	jb SHORT .MoveHighlightedItemByAX ; No rotation for PgDn
	178	; Fall to .SelectLastItem
	179	ALIGN JUMP_ALIGN
	180	.SelectLastItem:
	181	mov ax, [bp+MENUINIT.wItems]
[52]	182	sub ax, [bp+MENUINIT.wHighlightedItem]
[41]	183	dec ax
	184	jmp SHORT .MoveHighlightedItemByAX
	185
	186	ALIGN JUMP_ALIGN
	187	.DecrementSelectedItem:
	188	mov ax, -1
	189	jmp SHORT .MoveHighlightedItemByAX
	190	ALIGN JUMP_ALIGN
	191	.IncrementSelectedItem:
	192	mov ax, 1
	193	ALIGN JUMP_ALIGN
	194	.MoveHighlightedItemByAX:
	195	call MenuScrollbars_MoveHighlightedItemByAX
	196	call MenuTime_RestartSelectionTimeout
	197	stc
	198	ret

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