source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/MenuLoop.asm@ 421

Last change on this file since 421 was 376, checked in by gregli@…, 13 years ago

WIDE checkin... Added copyright and license information to sorce files, as per the GPL instructions for usage.
File size: 5.7 KB
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1; Project name : Assembly Library
2; Description : Menu loop for waiting keystrokes.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20
21; Section containing code
22SECTION .text
23
24;--------------------------------------------------------------------
25; MenuLoop_Enter
26; Parameters
27; SS:BP: Ptr to MENU
28; Returns:
29; Nothing
30; Corrupts registers:
31; AX, BX, CX, DX, SI, DI
32;--------------------------------------------------------------------
33ALIGN MENU_JUMP_ALIGN
34MenuLoop_Enter:
35 call KeystrokeProcessing
36 call TimeoutProcessing
37%ifdef MENUEVENT_IDLEPROCESSING_ENABLE
38 call MenuEvent_IdleProcessing ; User idle processing
39%endif
40 test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT
41 jz SHORT MenuLoop_Enter
42 ret
43
44
45;--------------------------------------------------------------------
46; KeystrokeProcessing
47; TimeoutProcessing
48; Parameters
49; SS:BP: Ptr to MENU
50; Returns:
51; Nothing
52; Corrupts registers:
53; All, except SS:BP
54;--------------------------------------------------------------------
55ALIGN MENU_JUMP_ALIGN
56KeystrokeProcessing:
57 call Keyboard_GetKeystrokeToAX
58 jnz SHORT ProcessKeystrokeFromAX
59NoKeystrokeToProcess:
60 ret
61
62ALIGN MENU_JUMP_ALIGN
63TimeoutProcessing:
64 call MenuTime_UpdateSelectionTimeout
65 jnc NoKeystrokeToProcess
66 mov al, CR ; Fake ENTER to select item
67 ; Fall to ProcessKeystrokeFromAX
68
69
70;--------------------------------------------------------------------
71; ProcessKeystrokeFromAX
72; Parameters
73; AL: ASCII character
74; AH: BIOS scan code
75; SS:BP: Ptr to MENU
76; Returns:
77; Nothing
78; Corrupts registers:
79; AX, BX, CX, DX, SI, DI
80;--------------------------------------------------------------------
81ALIGN MENU_JUMP_ALIGN
82ProcessKeystrokeFromAX:
83 xchg cx, ax
84 call MenuTime_StopSelectionTimeout
85 xchg ax, cx
86 call .ProcessMenuSystemKeystrokeFromAX
87 jc SHORT NoKeystrokeToProcess
88 jmp MenuEvent_KeyStrokeInAX
89
90;--------------------------------------------------------------------
91; .ProcessMenuSystemKeystrokeFromAX
92; Parameters
93; AL: ASCII character
94; AH: BIOS scan code
95; SS:BP: Ptr to MENU
96; Returns:
97; CF: Set if keystroke processed
98; Cleared if keystroke not processed
99; AL: ASCII character (if CF cleared)
100; AH: BIOS scan code (if CF cleared)
101; Corrupts registers:
102; BX, CX, DX, SI, DI
103;--------------------------------------------------------------------
104ALIGN MENU_JUMP_ALIGN
105.ProcessMenuSystemKeystrokeFromAX:
106 cmp al, ESC
107 je SHORT .LeaveMenuWithoutSelectingItem
108 cmp al, CR
109 je SHORT .SelectItem
110
111 test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING
112 jz SHORT MenuLoop_ProcessScrollingKeysFromAX
113 ret ; Return with CF cleared since keystroke not processed
114
115ALIGN MENU_JUMP_ALIGN
116.LeaveMenuWithoutSelectingItem:
117 call MenuEvent_ExitMenu
118 jnc SHORT .CancelMenuExit
119 call MenuInit_CloseMenuWindow
120 mov WORD [bp+MENUINIT.wHighlightedItem], NO_ITEM_HIGHLIGHTED
121.CancelMenuExit:
122 stc
123 ret
124
125ALIGN MENU_JUMP_ALIGN
126.SelectItem:
127 mov cx, [bp+MENUINIT.wHighlightedItem]
128 call MenuEvent_ItemSelectedFromCX
129 stc
130 ret
131
132
133;--------------------------------------------------------------------
134; MenuLoop_ProcessScrollingKeysFromAX
135; Parameters
136; AL: ASCII character
137; AH: BIOS scan code
138; SS:BP: Ptr to MENU
139; Returns:
140; CF: Set if keystroke processed
141; Cleared if keystroke not processed
142; AL: ASCII character (if CF cleared)
143; AH: BIOS scan code (if CF cleared)
144; Corrupts registers:
145; BX, CX, DX, SI, DI
146;--------------------------------------------------------------------
147ALIGN MENU_JUMP_ALIGN
148MenuLoop_ProcessScrollingKeysFromAX:
149 xchg ah, al
150 cmp al, MENU_KEY_PGUP
151 je SHORT .ChangeToPreviousPage
152 cmp al, MENU_KEY_PGDN
153 je SHORT .ChangeToNextPage
154 cmp al, MENU_KEY_HOME
155 je SHORT .SelectFirstItem
156 cmp al, MENU_KEY_END
157 je SHORT .SelectLastItem
158
159 cmp al, MENU_KEY_UP
160 je SHORT .DecrementSelectedItem
161 cmp al, MENU_KEY_DOWN
162 je SHORT .IncrementSelectedItem
163 clc ; Clear CF since keystroke not processed
164 xchg ah, al
165 ret
166
167ALIGN MENU_JUMP_ALIGN
168.ChangeToPreviousPage:
169 call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
170 xchg ax, cx
171 neg ax
172 mov cx, [bp+MENUINIT.wHighlightedItem]
173 add cx, ax
174 jge SHORT .MoveHighlightedItemByAX ; No rotation for PgUp
175 ; Fall to .SelectFirstItem
176ALIGN MENU_JUMP_ALIGN
177.SelectFirstItem:
178 mov ax, [bp+MENUINIT.wHighlightedItem]
179 neg ax
180 jmp SHORT .MoveHighlightedItemByAX
181
182ALIGN MENU_JUMP_ALIGN
183.ChangeToNextPage:
184 call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
185 xchg ax, cx
186 mov cx, [bp+MENUINIT.wHighlightedItem]
187 add cx, ax
188 cmp cx, [bp+MENUINIT.wItems]
189 jb SHORT .MoveHighlightedItemByAX ; No rotation for PgDn
190 ; Fall to .SelectLastItem
191ALIGN MENU_JUMP_ALIGN
192.SelectLastItem:
193 stc
194 mov ax, [bp+MENUINIT.wItems]
195 sbb ax, [bp+MENUINIT.wHighlightedItem]
196 jmp SHORT .MoveHighlightedItemByAX
197
198ALIGN MENU_JUMP_ALIGN
199.DecrementSelectedItem:
200 mov ax, -1
201 SKIP2B cx ; mov cx, <next instruction>
202.IncrementSelectedItem:
203 mov al, 1 ; AH is already 0
204ALIGN MENU_JUMP_ALIGN
205.MoveHighlightedItemByAX:
206 call MenuScrollbars_MoveHighlightedItemByAX
207 stc
208 ret
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