[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Menu loop for waiting keystrokes. |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; MenuLoop_Enter |
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| 9 | ; Parameters |
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| 10 | ; SS:BP: Ptr to MENU |
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| 11 | ; Returns: |
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| 12 | ; Nothing |
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| 13 | ; Corrupts registers: |
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| 14 | ; AX, BX, CX, DX, SI, DI |
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| 15 | ;-------------------------------------------------------------------- |
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| 16 | ALIGN JUMP_ALIGN |
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| 17 | MenuLoop_Enter: |
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[58] | 18 | call KeystrokeProcessing |
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| 19 | call TimeoutProcessing |
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[105] | 20 | call MenuEvent_IdleProcessing ; User idle processing |
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[41] | 21 | test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT |
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| 22 | jz SHORT MenuLoop_Enter |
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[58] | 23 | ret |
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[41] | 24 | |
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| 25 | |
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| 26 | ;-------------------------------------------------------------------- |
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[105] | 27 | ; KeystrokeProcessing |
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[58] | 28 | ; TimeoutProcessing |
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[41] | 29 | ; Parameters |
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| 30 | ; SS:BP: Ptr to MENU |
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| 31 | ; Returns: |
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| 32 | ; Nothing |
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| 33 | ; Corrupts registers: |
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[58] | 34 | ; All, except SS:BP |
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[41] | 35 | ;-------------------------------------------------------------------- |
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| 36 | ALIGN JUMP_ALIGN |
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[105] | 37 | KeystrokeProcessing: |
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| 38 | call Keyboard_GetKeystrokeToAX |
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| 39 | jnz SHORT ProcessKeystrokeFromAX |
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| 40 | NoKeystrokeToProcess: |
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| 41 | ret |
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[41] | 42 | |
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[58] | 43 | ALIGN JUMP_ALIGN |
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| 44 | TimeoutProcessing: |
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| 45 | call MenuTime_UpdateSelectionTimeout |
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[105] | 46 | jnc NoKeystrokeToProcess |
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[178] | 47 | mov al, CR ; Fake ENTER to select item |
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[105] | 48 | ; Fall to ProcessKeystrokeFromAX |
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[41] | 49 | |
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[58] | 50 | |
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[41] | 51 | ;-------------------------------------------------------------------- |
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| 52 | ; ProcessKeystrokeFromAX |
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| 53 | ; Parameters |
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| 54 | ; AL: ASCII character |
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| 55 | ; AH: BIOS scan code |
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| 56 | ; SS:BP: Ptr to MENU |
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| 57 | ; Returns: |
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[133] | 58 | ; Nothing |
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[41] | 59 | ; Corrupts registers: |
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| 60 | ; AX, BX, CX, DX, SI, DI |
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| 61 | ;-------------------------------------------------------------------- |
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| 62 | ALIGN JUMP_ALIGN |
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| 63 | ProcessKeystrokeFromAX: |
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[60] | 64 | xchg cx, ax |
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| 65 | call MenuTime_StopSelectionTimeout |
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| 66 | xchg ax, cx |
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| 67 | call .ProcessMenuSystemKeystrokeFromAX |
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[105] | 68 | jc SHORT NoKeystrokeToProcess |
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[41] | 69 | jmp MenuEvent_KeyStrokeInAX |
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| 70 | |
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| 71 | ;-------------------------------------------------------------------- |
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[60] | 72 | ; .ProcessMenuSystemKeystrokeFromAX |
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[41] | 73 | ; Parameters |
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| 74 | ; AL: ASCII character |
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| 75 | ; AH: BIOS scan code |
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| 76 | ; SS:BP: Ptr to MENU |
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| 77 | ; Returns: |
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| 78 | ; CF: Set if keystroke processed |
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| 79 | ; Cleared if keystroke not processed |
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| 80 | ; AL: ASCII character (if CF cleared) |
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| 81 | ; AH: BIOS scan code (if CF cleared) |
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| 82 | ; Corrupts registers: |
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| 83 | ; BX, CX, DX, SI, DI |
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| 84 | ;-------------------------------------------------------------------- |
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| 85 | ALIGN JUMP_ALIGN |
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[60] | 86 | .ProcessMenuSystemKeystrokeFromAX: |
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[178] | 87 | cmp al, ESC |
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[41] | 88 | je SHORT .LeaveMenuWithoutSelectingItem |
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[178] | 89 | cmp al, CR |
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[41] | 90 | je SHORT .SelectItem |
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| 91 | |
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| 92 | test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING |
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| 93 | jz SHORT MenuLoop_ProcessScrollingKeysFromAX |
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[133] | 94 | ret ; Return with CF cleared since keystroke not processed |
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[41] | 95 | |
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| 96 | ALIGN JUMP_ALIGN |
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| 97 | .LeaveMenuWithoutSelectingItem: |
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[58] | 98 | call MenuEvent_ExitMenu |
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| 99 | jnc SHORT .CancelMenuExit |
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[41] | 100 | call MenuInit_CloseMenuWindow |
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[52] | 101 | mov WORD [bp+MENUINIT.wHighlightedItem], NO_ITEM_HIGHLIGHTED |
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[58] | 102 | .CancelMenuExit: |
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[41] | 103 | stc |
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| 104 | ret |
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| 105 | |
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| 106 | ALIGN JUMP_ALIGN |
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| 107 | .SelectItem: |
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[52] | 108 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 109 | call MenuEvent_ItemSelectedFromCX |
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| 110 | stc |
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| 111 | ret |
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| 112 | |
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| 113 | |
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| 114 | ;-------------------------------------------------------------------- |
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| 115 | ; MenuLoop_ProcessScrollingKeysFromAX |
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| 116 | ; Parameters |
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| 117 | ; AL: ASCII character |
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| 118 | ; AH: BIOS scan code |
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| 119 | ; SS:BP: Ptr to MENU |
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| 120 | ; Returns: |
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| 121 | ; CF: Set if keystroke processed |
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| 122 | ; Cleared if keystroke not processed |
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| 123 | ; AL: ASCII character (if CF cleared) |
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| 124 | ; AH: BIOS scan code (if CF cleared) |
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| 125 | ; Corrupts registers: |
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| 126 | ; BX, CX, DX, SI, DI |
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| 127 | ;-------------------------------------------------------------------- |
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| 128 | ALIGN JUMP_ALIGN |
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| 129 | MenuLoop_ProcessScrollingKeysFromAX: |
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[178] | 130 | xchg ah, al |
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| 131 | cmp al, MENU_KEY_PGUP |
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[41] | 132 | je SHORT .ChangeToPreviousPage |
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[178] | 133 | cmp al, MENU_KEY_PGDN |
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[41] | 134 | je SHORT .ChangeToNextPage |
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[178] | 135 | cmp al, MENU_KEY_HOME |
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[41] | 136 | je SHORT .SelectFirstItem |
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[178] | 137 | cmp al, MENU_KEY_END |
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[41] | 138 | je SHORT .SelectLastItem |
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| 139 | |
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[178] | 140 | cmp al, MENU_KEY_UP |
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[41] | 141 | je SHORT .DecrementSelectedItem |
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[178] | 142 | cmp al, MENU_KEY_DOWN |
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[41] | 143 | je SHORT .IncrementSelectedItem |
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| 144 | clc ; Clear CF since keystroke not processed |
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[178] | 145 | xchg ah, al |
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[41] | 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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[52] | 153 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 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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[52] | 159 | mov ax, [bp+MENUINIT.wHighlightedItem] |
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[41] | 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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[52] | 167 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 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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[178] | 174 | stc |
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[41] | 175 | mov ax, [bp+MENUINIT.wItems] |
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[178] | 176 | sbb ax, [bp+MENUINIT.wHighlightedItem] |
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[41] | 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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[178] | 182 | SKIP2B cx ; mov cx, <next instruction> |
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[41] | 183 | .IncrementSelectedItem: |
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[178] | 184 | mov al, 1 ; AH is already 0 |
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[41] | 185 | ALIGN JUMP_ALIGN |
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| 186 | .MoveHighlightedItemByAX: |
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| 187 | call MenuScrollbars_MoveHighlightedItemByAX |
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| 188 | stc |
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| 189 | ret |
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