[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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[189] | 20 | %ifdef MENUEVENT_IDLEPROCESSING_ENABLE |
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[105] | 21 | call MenuEvent_IdleProcessing ; User idle processing |
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[189] | 22 | %endif |
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[41] | 23 | test BYTE [bp+MENU.bFlags], FLG_MENU_EXIT |
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| 24 | jz SHORT MenuLoop_Enter |
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[58] | 25 | ret |
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[41] | 26 | |
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| 27 | |
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| 28 | ;-------------------------------------------------------------------- |
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[105] | 29 | ; KeystrokeProcessing |
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[58] | 30 | ; TimeoutProcessing |
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[41] | 31 | ; Parameters |
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| 32 | ; SS:BP: Ptr to MENU |
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| 33 | ; Returns: |
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| 34 | ; Nothing |
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| 35 | ; Corrupts registers: |
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[58] | 36 | ; All, except SS:BP |
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[41] | 37 | ;-------------------------------------------------------------------- |
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| 38 | ALIGN JUMP_ALIGN |
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[105] | 39 | KeystrokeProcessing: |
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| 40 | call Keyboard_GetKeystrokeToAX |
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| 41 | jnz SHORT ProcessKeystrokeFromAX |
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| 42 | NoKeystrokeToProcess: |
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| 43 | ret |
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[41] | 44 | |
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[58] | 45 | ALIGN JUMP_ALIGN |
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| 46 | TimeoutProcessing: |
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| 47 | call MenuTime_UpdateSelectionTimeout |
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[105] | 48 | jnc NoKeystrokeToProcess |
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[178] | 49 | mov al, CR ; Fake ENTER to select item |
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[105] | 50 | ; Fall to ProcessKeystrokeFromAX |
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[41] | 51 | |
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[58] | 52 | |
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[41] | 53 | ;-------------------------------------------------------------------- |
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| 54 | ; ProcessKeystrokeFromAX |
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| 55 | ; Parameters |
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| 56 | ; AL: ASCII character |
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| 57 | ; AH: BIOS scan code |
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| 58 | ; SS:BP: Ptr to MENU |
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| 59 | ; Returns: |
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[133] | 60 | ; Nothing |
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[41] | 61 | ; Corrupts registers: |
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| 62 | ; AX, BX, CX, DX, SI, DI |
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| 63 | ;-------------------------------------------------------------------- |
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| 64 | ALIGN JUMP_ALIGN |
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| 65 | ProcessKeystrokeFromAX: |
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[60] | 66 | xchg cx, ax |
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| 67 | call MenuTime_StopSelectionTimeout |
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| 68 | xchg ax, cx |
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| 69 | call .ProcessMenuSystemKeystrokeFromAX |
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[105] | 70 | jc SHORT NoKeystrokeToProcess |
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[41] | 71 | jmp MenuEvent_KeyStrokeInAX |
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| 72 | |
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| 73 | ;-------------------------------------------------------------------- |
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[60] | 74 | ; .ProcessMenuSystemKeystrokeFromAX |
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[41] | 75 | ; Parameters |
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| 76 | ; AL: ASCII character |
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| 77 | ; AH: BIOS scan code |
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| 78 | ; SS:BP: Ptr to MENU |
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| 79 | ; Returns: |
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| 80 | ; CF: Set if keystroke processed |
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| 81 | ; Cleared if keystroke not processed |
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| 82 | ; AL: ASCII character (if CF cleared) |
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| 83 | ; AH: BIOS scan code (if CF cleared) |
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| 84 | ; Corrupts registers: |
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| 85 | ; BX, CX, DX, SI, DI |
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| 86 | ;-------------------------------------------------------------------- |
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| 87 | ALIGN JUMP_ALIGN |
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[60] | 88 | .ProcessMenuSystemKeystrokeFromAX: |
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[178] | 89 | cmp al, ESC |
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[41] | 90 | je SHORT .LeaveMenuWithoutSelectingItem |
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[178] | 91 | cmp al, CR |
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[41] | 92 | je SHORT .SelectItem |
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| 93 | |
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| 94 | test BYTE [bp+MENU.bFlags], FLG_MENU_USER_HANDLES_SCROLLING |
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| 95 | jz SHORT MenuLoop_ProcessScrollingKeysFromAX |
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[133] | 96 | ret ; Return with CF cleared since keystroke not processed |
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[41] | 97 | |
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| 98 | ALIGN JUMP_ALIGN |
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| 99 | .LeaveMenuWithoutSelectingItem: |
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[58] | 100 | call MenuEvent_ExitMenu |
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| 101 | jnc SHORT .CancelMenuExit |
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[41] | 102 | call MenuInit_CloseMenuWindow |
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[52] | 103 | mov WORD [bp+MENUINIT.wHighlightedItem], NO_ITEM_HIGHLIGHTED |
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[58] | 104 | .CancelMenuExit: |
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[41] | 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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[52] | 110 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 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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[178] | 132 | xchg ah, al |
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| 133 | cmp al, MENU_KEY_PGUP |
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[41] | 134 | je SHORT .ChangeToPreviousPage |
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[178] | 135 | cmp al, MENU_KEY_PGDN |
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[41] | 136 | je SHORT .ChangeToNextPage |
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[178] | 137 | cmp al, MENU_KEY_HOME |
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[41] | 138 | je SHORT .SelectFirstItem |
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[178] | 139 | cmp al, MENU_KEY_END |
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[41] | 140 | je SHORT .SelectLastItem |
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| 141 | |
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[178] | 142 | cmp al, MENU_KEY_UP |
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[41] | 143 | je SHORT .DecrementSelectedItem |
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[178] | 144 | cmp al, MENU_KEY_DOWN |
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[41] | 145 | je SHORT .IncrementSelectedItem |
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| 146 | clc ; Clear CF since keystroke not processed |
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[178] | 147 | xchg ah, al |
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[41] | 148 | ret |
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| 149 | |
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| 150 | ALIGN JUMP_ALIGN |
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| 151 | .ChangeToPreviousPage: |
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| 152 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 153 | xchg ax, cx |
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| 154 | neg ax |
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[52] | 155 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 156 | add cx, ax |
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| 157 | jge SHORT .MoveHighlightedItemByAX ; No rotation for PgUp |
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| 158 | ; Fall to .SelectFirstItem |
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| 159 | ALIGN JUMP_ALIGN |
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| 160 | .SelectFirstItem: |
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[52] | 161 | mov ax, [bp+MENUINIT.wHighlightedItem] |
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[41] | 162 | neg ax |
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| 163 | jmp SHORT .MoveHighlightedItemByAX |
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| 164 | |
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| 165 | ALIGN JUMP_ALIGN |
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| 166 | .ChangeToNextPage: |
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| 167 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 168 | xchg ax, cx |
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[52] | 169 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 170 | add cx, ax |
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| 171 | cmp cx, [bp+MENUINIT.wItems] |
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| 172 | jb SHORT .MoveHighlightedItemByAX ; No rotation for PgDn |
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| 173 | ; Fall to .SelectLastItem |
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| 174 | ALIGN JUMP_ALIGN |
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| 175 | .SelectLastItem: |
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[178] | 176 | stc |
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[41] | 177 | mov ax, [bp+MENUINIT.wItems] |
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[178] | 178 | sbb ax, [bp+MENUINIT.wHighlightedItem] |
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[41] | 179 | jmp SHORT .MoveHighlightedItemByAX |
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| 180 | |
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| 181 | ALIGN JUMP_ALIGN |
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| 182 | .DecrementSelectedItem: |
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| 183 | mov ax, -1 |
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[178] | 184 | SKIP2B cx ; mov cx, <next instruction> |
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[41] | 185 | .IncrementSelectedItem: |
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[178] | 186 | mov al, 1 ; AH is already 0 |
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[41] | 187 | ALIGN JUMP_ALIGN |
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| 188 | .MoveHighlightedItemByAX: |
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| 189 | call MenuScrollbars_MoveHighlightedItemByAX |
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| 190 | stc |
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| 191 | ret |
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