[41] | 1 | ; File name : MenuLoop.asm |
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| 2 | ; Project name : Assembly Library |
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| 3 | ; Created date : 22.7.2010 |
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| 4 | ; Last update : 16.9.2010 |
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| 5 | ; Author : Tomi Tilli |
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| 6 | ; Description : Menu loop for waiting keystrokes. |
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| 7 | |
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| 8 | ; Section containing code |
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| 9 | SECTION .text |
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| 10 | |
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| 11 | ;-------------------------------------------------------------------- |
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| 12 | ; MenuLoop_Enter |
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| 13 | ; Parameters |
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| 14 | ; SS:BP: Ptr to MENU |
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| 15 | ; Returns: |
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| 16 | ; Nothing |
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| 17 | ; Corrupts registers: |
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| 18 | ; AX, BX, CX, DX, SI, DI |
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| 19 | ;-------------------------------------------------------------------- |
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| 20 | ALIGN JUMP_ALIGN |
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| 21 | MenuLoop_Enter: |
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| 22 | test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT |
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| 23 | jnz SHORT .ExitMenu |
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| 24 | call IdleTimeProcessing |
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| 25 | |
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| 26 | call MenuTime_UpdateSelectionTimeout |
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| 27 | mov ah, MENU_KEY_ENTER ; Fake ENTER to select item |
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| 28 | jc SHORT .ProcessFakedKeystrokeCausedByTimeout |
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| 29 | |
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| 30 | call Keyboard_GetKeystrokeToAX |
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| 31 | jz SHORT MenuLoop_Enter |
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| 32 | .ProcessFakedKeystrokeCausedByTimeout: |
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| 33 | call ProcessKeystrokeFromAX |
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| 34 | jmp SHORT MenuLoop_Enter |
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| 35 | |
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| 36 | ALIGN JUMP_ALIGN |
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| 37 | .ExitMenu: |
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| 38 | jmp MenuEvent_ExitMenu |
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| 39 | |
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| 40 | |
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| 41 | ;-------------------------------------------------------------------- |
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| 42 | ; IdleTimeProcessing |
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| 43 | ; Parameters |
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| 44 | ; SS:BP: Ptr to MENU |
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| 45 | ; Returns: |
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| 46 | ; Nothing |
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| 47 | ; Corrupts registers: |
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| 48 | ; AX, BX, DX |
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| 49 | ;-------------------------------------------------------------------- |
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| 50 | ALIGN JUMP_ALIGN |
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| 51 | IdleTimeProcessing: |
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| 52 | jmp MenuEvent_IdleProcessing ; User idle processing |
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| 53 | |
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| 54 | |
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| 55 | ;-------------------------------------------------------------------- |
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| 56 | ; ProcessKeystrokeFromAX |
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| 57 | ; Parameters |
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| 58 | ; AL: ASCII character |
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| 59 | ; AH: BIOS scan code |
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| 60 | ; SS:BP: Ptr to MENU |
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| 61 | ; Returns: |
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| 62 | ; Nothing |
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| 63 | ; Corrupts registers: |
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| 64 | ; AX, BX, CX, DX, SI, DI |
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| 65 | ;-------------------------------------------------------------------- |
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| 66 | ALIGN JUMP_ALIGN |
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| 67 | ProcessKeystrokeFromAX: |
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| 68 | call .ProcessMenuSystemKeystroke |
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| 69 | jc SHORT .Return |
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| 70 | jmp MenuEvent_KeyStrokeInAX |
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| 71 | ALIGN JUMP_ALIGN, ret |
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| 72 | .Return: |
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| 73 | ret |
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| 74 | |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | ; .ProcessMenuSystemKeystroke |
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| 77 | ; Parameters |
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| 78 | ; AL: ASCII character |
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| 79 | ; AH: BIOS scan code |
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| 80 | ; SS:BP: Ptr to MENU |
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| 81 | ; Returns: |
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| 82 | ; CF: Set if keystroke processed |
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| 83 | ; Cleared if keystroke not processed |
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| 84 | ; AL: ASCII character (if CF cleared) |
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| 85 | ; AH: BIOS scan code (if CF cleared) |
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| 86 | ; Corrupts registers: |
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| 87 | ; BX, CX, DX, SI, DI |
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| 88 | ;-------------------------------------------------------------------- |
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| 89 | ALIGN JUMP_ALIGN |
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| 90 | .ProcessMenuSystemKeystroke: |
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| 91 | cmp ah, MENU_KEY_ESC |
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| 92 | je SHORT .LeaveMenuWithoutSelectingItem |
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| 93 | cmp ah, MENU_KEY_ENTER |
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| 94 | je SHORT .SelectItem |
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| 95 | |
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| 96 | test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING |
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| 97 | jz SHORT MenuLoop_ProcessScrollingKeysFromAX |
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| 98 | clc ; Clear CF since keystroke not processed |
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| 99 | ret |
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| 100 | |
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| 101 | ALIGN JUMP_ALIGN |
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| 102 | .LeaveMenuWithoutSelectingItem: |
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| 103 | call MenuInit_CloseMenuWindow |
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| 104 | mov WORD [bp+MENU.wHighlightedItem], NO_ITEM_HIGHLIGHTED |
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| 105 | stc |
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| 106 | ret |
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| 107 | |
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| 108 | ALIGN JUMP_ALIGN |
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| 109 | .SelectItem: |
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| 110 | mov cx, [bp+MENU.wHighlightedItem] |
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| 111 | call MenuEvent_ItemSelectedFromCX |
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| 112 | stc |
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| 113 | ret |
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| 114 | |
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| 115 | |
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| 116 | ;-------------------------------------------------------------------- |
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| 117 | ; MenuLoop_ProcessScrollingKeysFromAX |
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| 118 | ; Parameters |
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| 119 | ; AL: ASCII character |
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| 120 | ; AH: BIOS scan code |
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| 121 | ; SS:BP: Ptr to MENU |
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| 122 | ; Returns: |
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| 123 | ; CF: Set if keystroke processed |
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| 124 | ; Cleared if keystroke not processed |
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| 125 | ; AL: ASCII character (if CF cleared) |
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| 126 | ; AH: BIOS scan code (if CF cleared) |
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| 127 | ; Corrupts registers: |
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| 128 | ; BX, CX, DX, SI, DI |
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| 129 | ;-------------------------------------------------------------------- |
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| 130 | ALIGN JUMP_ALIGN |
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| 131 | MenuLoop_ProcessScrollingKeysFromAX: |
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| 132 | cmp ah, MENU_KEY_PGUP |
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| 133 | je SHORT .ChangeToPreviousPage |
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| 134 | cmp ah, MENU_KEY_PGDN |
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| 135 | je SHORT .ChangeToNextPage |
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| 136 | cmp ah, MENU_KEY_HOME |
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| 137 | je SHORT .SelectFirstItem |
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| 138 | cmp ah, MENU_KEY_END |
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| 139 | je SHORT .SelectLastItem |
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| 140 | |
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| 141 | cmp ah, MENU_KEY_UP |
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| 142 | je SHORT .DecrementSelectedItem |
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| 143 | cmp ah, MENU_KEY_DOWN |
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| 144 | je SHORT .IncrementSelectedItem |
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| 145 | clc ; Clear CF since keystroke not processed |
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| 146 | ret |
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| 147 | |
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| 148 | ALIGN JUMP_ALIGN |
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| 149 | .ChangeToPreviousPage: |
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| 150 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 151 | xchg ax, cx |
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| 152 | neg ax |
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| 153 | mov cx, [bp+MENU.wHighlightedItem] |
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| 154 | add cx, ax |
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| 155 | jge SHORT .MoveHighlightedItemByAX ; No rotation for PgUp |
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| 156 | ; Fall to .SelectFirstItem |
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| 157 | ALIGN JUMP_ALIGN |
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| 158 | .SelectFirstItem: |
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| 159 | mov ax, [bp+MENU.wHighlightedItem] |
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| 160 | neg ax |
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| 161 | jmp SHORT .MoveHighlightedItemByAX |
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| 162 | |
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| 163 | ALIGN JUMP_ALIGN |
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| 164 | .ChangeToNextPage: |
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| 165 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 166 | xchg ax, cx |
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| 167 | mov cx, [bp+MENU.wHighlightedItem] |
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| 168 | add cx, ax |
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| 169 | cmp cx, [bp+MENUINIT.wItems] |
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| 170 | jb SHORT .MoveHighlightedItemByAX ; No rotation for PgDn |
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| 171 | ; Fall to .SelectLastItem |
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| 172 | ALIGN JUMP_ALIGN |
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| 173 | .SelectLastItem: |
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| 174 | mov ax, [bp+MENUINIT.wItems] |
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| 175 | sub ax, [bp+MENU.wHighlightedItem] |
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| 176 | dec ax |
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| 177 | jmp SHORT .MoveHighlightedItemByAX |
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| 178 | |
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| 179 | ALIGN JUMP_ALIGN |
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| 180 | .DecrementSelectedItem: |
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| 181 | mov ax, -1 |
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| 182 | jmp SHORT .MoveHighlightedItemByAX |
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| 183 | ALIGN JUMP_ALIGN |
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| 184 | .IncrementSelectedItem: |
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| 185 | mov ax, 1 |
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| 186 | ALIGN JUMP_ALIGN |
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| 187 | .MoveHighlightedItemByAX: |
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| 188 | call MenuScrollbars_MoveHighlightedItemByAX |
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| 189 | call MenuTime_RestartSelectionTimeout |
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| 190 | stc |
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| 191 | ret |
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