source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/MenuLoop.asm@ 496

Last change on this file since 496 was 492, checked in by gregli@…, 12 years ago

Removed the dependency between MODULE_BOOT_MENU and MODULE_HOTKEYS. With these changes, 0, 1, or 2 of them can be included in a build. This change also means that the hotkeys don't work while the menu is up. But the most important hotkey there was for Rom Boot, and that has been added to the menu as a choice proper. Lots of changes across the board in the hotkeys code - even if we eventually back this change out (becaue, for example we want hotkeys to work in the menu) we should probably start from this base and add that functionality back in, as these changes results in approximately 120 bytes of savings and includes new functionality, such as the Rom Boot menu item and the Com Detect hotkey.
File size: 5.8 KB
RevLine 
[41]1; Project name : Assembly Library
2; Description : Menu loop for waiting keystrokes.
3
[376]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
[41]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;--------------------------------------------------------------------
[369]33ALIGN MENU_JUMP_ALIGN
[41]34MenuLoop_Enter:
[58]35 call KeystrokeProcessing
36 call TimeoutProcessing
[189]37%ifdef MENUEVENT_IDLEPROCESSING_ENABLE
[105]38 call MenuEvent_IdleProcessing ; User idle processing
[189]39%endif
[41]40 test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT
41 jz SHORT MenuLoop_Enter
[58]42 ret
[41]43
44
45;--------------------------------------------------------------------
[105]46; KeystrokeProcessing
[58]47; TimeoutProcessing
[41]48; Parameters
49; SS:BP: Ptr to MENU
50; Returns:
51; Nothing
52; Corrupts registers:
[58]53; All, except SS:BP
[41]54;--------------------------------------------------------------------
[369]55ALIGN MENU_JUMP_ALIGN
[105]56KeystrokeProcessing:
57 call Keyboard_GetKeystrokeToAX
58 jnz SHORT ProcessKeystrokeFromAX
59NoKeystrokeToProcess:
60 ret
[41]61
[369]62ALIGN MENU_JUMP_ALIGN
[58]63TimeoutProcessing:
64 call MenuTime_UpdateSelectionTimeout
[105]65 jnc NoKeystrokeToProcess
[178]66 mov al, CR ; Fake ENTER to select item
[105]67 ; Fall to ProcessKeystrokeFromAX
[41]68
[58]69
[41]70;--------------------------------------------------------------------
71; ProcessKeystrokeFromAX
72; Parameters
73; AL: ASCII character
74; AH: BIOS scan code
75; SS:BP: Ptr to MENU
76; Returns:
[133]77; Nothing
[41]78; Corrupts registers:
79; AX, BX, CX, DX, SI, DI
80;--------------------------------------------------------------------
[369]81ALIGN MENU_JUMP_ALIGN
[41]82ProcessKeystrokeFromAX:
[60]83 xchg cx, ax
84 call MenuTime_StopSelectionTimeout
85 xchg ax, cx
86 call .ProcessMenuSystemKeystrokeFromAX
[492]87%ifdef MENUEVENT_KeyStrokeInAX
[105]88 jc SHORT NoKeystrokeToProcess
[41]89 jmp MenuEvent_KeyStrokeInAX
[492]90%else
91 jmp SHORT NoKeystrokeToProcess
92%endif
93
[41]94;--------------------------------------------------------------------
[60]95; .ProcessMenuSystemKeystrokeFromAX
[41]96; Parameters
97; AL: ASCII character
98; AH: BIOS scan code
99; SS:BP: Ptr to MENU
100; Returns:
101; CF: Set if keystroke processed
102; Cleared if keystroke not processed
103; AL: ASCII character (if CF cleared)
104; AH: BIOS scan code (if CF cleared)
105; Corrupts registers:
106; BX, CX, DX, SI, DI
107;--------------------------------------------------------------------
[369]108ALIGN MENU_JUMP_ALIGN
[60]109.ProcessMenuSystemKeystrokeFromAX:
[492]110%ifndef MENU_NO_ESC
[178]111 cmp al, ESC
[41]112 je SHORT .LeaveMenuWithoutSelectingItem
[492]113%endif
[178]114 cmp al, CR
[41]115 je SHORT .SelectItem
116
117 test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING
118 jz SHORT MenuLoop_ProcessScrollingKeysFromAX
[133]119 ret ; Return with CF cleared since keystroke not processed
[41]120
[492]121%ifndef MENU_NO_ESC
[369]122ALIGN MENU_JUMP_ALIGN
[41]123.LeaveMenuWithoutSelectingItem:
[58]124 call MenuEvent_ExitMenu
125 jnc SHORT .CancelMenuExit
[41]126 call MenuInit_CloseMenuWindow
[52]127 mov WORD [bp+MENUINIT.wHighlightedItem], NO_ITEM_HIGHLIGHTED
[58]128.CancelMenuExit:
[41]129 stc
130 ret
[492]131%endif
132
[369]133ALIGN MENU_JUMP_ALIGN
[41]134.SelectItem:
[52]135 mov cx, [bp+MENUINIT.wHighlightedItem]
[41]136 call MenuEvent_ItemSelectedFromCX
137 stc
138 ret
139
140
141;--------------------------------------------------------------------
142; MenuLoop_ProcessScrollingKeysFromAX
143; Parameters
144; AL: ASCII character
145; AH: BIOS scan code
146; SS:BP: Ptr to MENU
147; Returns:
148; CF: Set if keystroke processed
149; Cleared if keystroke not processed
150; AL: ASCII character (if CF cleared)
151; AH: BIOS scan code (if CF cleared)
152; Corrupts registers:
153; BX, CX, DX, SI, DI
154;--------------------------------------------------------------------
[369]155ALIGN MENU_JUMP_ALIGN
[41]156MenuLoop_ProcessScrollingKeysFromAX:
[178]157 xchg ah, al
158 cmp al, MENU_KEY_PGUP
[41]159 je SHORT .ChangeToPreviousPage
[178]160 cmp al, MENU_KEY_PGDN
[41]161 je SHORT .ChangeToNextPage
[178]162 cmp al, MENU_KEY_HOME
[41]163 je SHORT .SelectFirstItem
[178]164 cmp al, MENU_KEY_END
[41]165 je SHORT .SelectLastItem
166
[178]167 cmp al, MENU_KEY_UP
[41]168 je SHORT .DecrementSelectedItem
[178]169 cmp al, MENU_KEY_DOWN
[41]170 je SHORT .IncrementSelectedItem
171 clc ; Clear CF since keystroke not processed
[178]172 xchg ah, al
[41]173 ret
174
[369]175ALIGN MENU_JUMP_ALIGN
[41]176.ChangeToPreviousPage:
177 call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
178 xchg ax, cx
179 neg ax
[52]180 mov cx, [bp+MENUINIT.wHighlightedItem]
[41]181 add cx, ax
182 jge SHORT .MoveHighlightedItemByAX ; No rotation for PgUp
183 ; Fall to .SelectFirstItem
[369]184ALIGN MENU_JUMP_ALIGN
[41]185.SelectFirstItem:
[52]186 mov ax, [bp+MENUINIT.wHighlightedItem]
[41]187 neg ax
188 jmp SHORT .MoveHighlightedItemByAX
189
[369]190ALIGN MENU_JUMP_ALIGN
[41]191.ChangeToNextPage:
192 call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
193 xchg ax, cx
[52]194 mov cx, [bp+MENUINIT.wHighlightedItem]
[41]195 add cx, ax
196 cmp cx, [bp+MENUINIT.wItems]
197 jb SHORT .MoveHighlightedItemByAX ; No rotation for PgDn
198 ; Fall to .SelectLastItem
[369]199ALIGN MENU_JUMP_ALIGN
[41]200.SelectLastItem:
[178]201 stc
[41]202 mov ax, [bp+MENUINIT.wItems]
[178]203 sbb ax, [bp+MENUINIT.wHighlightedItem]
[41]204 jmp SHORT .MoveHighlightedItemByAX
205
[369]206ALIGN MENU_JUMP_ALIGN
[41]207.DecrementSelectedItem:
208 mov ax, -1
[178]209 SKIP2B cx ; mov cx, <next instruction>
[41]210.IncrementSelectedItem:
[178]211 mov al, 1 ; AH is already 0
[369]212ALIGN MENU_JUMP_ALIGN
[41]213.MoveHighlightedItemByAX:
214 call MenuScrollbars_MoveHighlightedItemByAX
215 stc
216 ret
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