[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for drawing scroll bars over menu borders. |
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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 | ; MenuScrollbars_AreScrollbarsNeeded |
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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 | ; CF: Set if scroll bars are needed |
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| 13 | ; Cleared if no scroll bars needed |
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| 14 | ; Corrupts registers: |
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[67] | 15 | ; AX |
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[41] | 16 | ;-------------------------------------------------------------------- |
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[369] | 17 | ALIGN MENU_JUMP_ALIGN |
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[41] | 18 | MenuScrollbars_AreScrollbarsNeeded: |
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[67] | 19 | xchg ax, cx |
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[41] | 20 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 21 | cmp cx, [bp+MENUINIT.wItems] ; Set CF if max visible < total items |
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[67] | 22 | xchg cx, ax |
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[41] | 23 | ret |
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| 24 | |
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| 25 | |
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| 26 | ;-------------------------------------------------------------------- |
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| 27 | ; MenuScrollbars_GetScrollCharacterToALForLineInDI |
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| 28 | ; Parameters |
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| 29 | ; DI: Index of item line to draw |
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| 30 | ; SS:BP: Ptr to MENU |
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| 31 | ; Returns: |
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| 32 | ; AL: Scroll track or thumb character |
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| 33 | ; Corrupts registers: |
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| 34 | ; AH, CX, DX |
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| 35 | ;-------------------------------------------------------------------- |
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[369] | 36 | ALIGN MENU_JUMP_ALIGN |
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[41] | 37 | MenuScrollbars_GetScrollCharacterToALForLineInDI: |
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| 38 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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[181] | 39 | ; Get first thumb line to AX |
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| 40 | mov ax, [bp+MENU.wFirstVisibleItem] |
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| 41 | call .CalculateFirstOrLastThumbLineToAX |
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| 42 | |
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[41] | 43 | cmp di, ax ; Before first thumb line? |
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| 44 | jb SHORT .ReturnTrackCharacter |
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| 45 | call .GetLastThumbLineToAX |
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[181] | 46 | cmp ax, di ; After last thumb line? |
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[369] | 47 | ALIGN MENU_JUMP_ALIGN |
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[41] | 48 | .ReturnTrackCharacter: |
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| 49 | mov al, SCROLL_TRACK_CHARACTER |
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[181] | 50 | jb SHORT .Return |
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| 51 | mov al, SCROLL_THUMB_CHARACTER |
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[369] | 52 | ALIGN MENU_JUMP_ALIGN, ret |
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[181] | 53 | .Return: |
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[41] | 54 | ret |
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| 55 | |
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| 56 | ;-------------------------------------------------------------------- |
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| 57 | ; .GetLastThumbLineToAX |
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| 58 | ; Parameters |
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| 59 | ; CX: Max visible items on page |
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| 60 | ; SS:BP: Ptr to MENU |
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| 61 | ; Returns: |
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| 62 | ; AX: Item line for last thumb character |
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| 63 | ; Corrupts registers: |
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| 64 | ; CX, DX |
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[133] | 65 | ;-------------------------------------------------------------------- |
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[369] | 66 | ALIGN MENU_JUMP_ALIGN |
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[41] | 67 | .GetLastThumbLineToAX: |
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| 68 | call MenuScrollbars_GetLastVisibleItemOnPageToAX |
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[181] | 69 | ; Fall to .CalculateFirstOrLastThumbLineToAX |
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[41] | 70 | |
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| 71 | ;-------------------------------------------------------------------- |
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[181] | 72 | ; .CalculateFirstOrLastThumbLineToAX |
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[41] | 73 | ; Parameters |
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[181] | 74 | ; AX: Index of first or last visible item on page |
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[41] | 75 | ; CX: Max visible items on page |
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| 76 | ; SS:BP: Ptr to MENU |
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| 77 | ; Returns: |
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| 78 | ; AX: Item line for first thumb character |
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| 79 | ; Corrupts registers: |
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| 80 | ; CX, DX |
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| 81 | ;-------------------------------------------------------------------- |
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[369] | 82 | ALIGN MENU_JUMP_ALIGN |
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[41] | 83 | .CalculateFirstOrLastThumbLineToAX: |
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| 84 | mul cx |
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| 85 | div WORD [bp+MENUINIT.wItems] |
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| 86 | ret ; (Visible items on page * First visible item on page) / total items |
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| 87 | |
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| 88 | |
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| 89 | ;-------------------------------------------------------------------- |
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| 90 | ; MenuScrollbars_MoveHighlightedItemByAX |
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| 91 | ; Parameters |
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| 92 | ; AX: Signed offset to new item to be highlighted |
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| 93 | ; SS:BP: Ptr to MENU |
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| 94 | ; Returns: |
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| 95 | ; Nothing |
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| 96 | ; Corrupts registers: |
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| 97 | ; AX, BX, CX, DX, SI, DI |
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| 98 | ;-------------------------------------------------------------------- |
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[369] | 99 | ALIGN MENU_JUMP_ALIGN |
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[41] | 100 | MenuScrollbars_MoveHighlightedItemByAX: |
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[52] | 101 | mov cx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 102 | add cx, ax |
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[181] | 103 | ; Fall to .RotateItemInCX |
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| 104 | |
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| 105 | ;-------------------------------------------------------------------- |
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| 106 | ; .RotateItemInCX |
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| 107 | ; Parameters |
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| 108 | ; CX: Possibly under of overflown item to be rotated |
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| 109 | ; SS:BP: Ptr to MENU |
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| 110 | ; Returns: |
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| 111 | ; CX: Valid item index |
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| 112 | ; Corrupts registers: |
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| 113 | ; DX |
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| 114 | ;-------------------------------------------------------------------- |
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| 115 | ;.RotateItemInCX: |
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| 116 | mov dx, [bp+MENUINIT.wItems] |
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| 117 | test cx, cx |
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| 118 | js SHORT .RotateNegativeItemInCX |
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| 119 | sub cx, dx |
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| 120 | jae SHORT .ScrollPageForNewItemInCX |
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| 121 | |
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[369] | 122 | ALIGN MENU_JUMP_ALIGN |
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[181] | 123 | .RotateNegativeItemInCX: |
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| 124 | add cx, dx |
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[41] | 125 | ; Fall to .ScrollPageForNewItemInCX |
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| 126 | |
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| 127 | ;-------------------------------------------------------------------- |
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| 128 | ; .ScrollPageForNewItemInCX |
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| 129 | ; Parameters |
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| 130 | ; CX: New item to be highlighted |
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| 131 | ; SS:BP: Ptr to MENU |
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| 132 | ; Returns: |
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| 133 | ; Nothing |
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| 134 | ; Corrupts registers: |
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| 135 | ; AX, BX, CX, DX, SI, DI |
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| 136 | ;-------------------------------------------------------------------- |
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[369] | 137 | ALIGN MENU_JUMP_ALIGN |
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[41] | 138 | .ScrollPageForNewItemInCX: |
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| 139 | call MenuScrollbars_IsItemInCXonVisiblePage |
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| 140 | jc SHORT .HighlightNewItemOnCX |
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| 141 | |
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| 142 | mov dx, [bp+MENU.wFirstVisibleItem] |
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[52] | 143 | sub dx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 144 | |
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[181] | 145 | ; Get MaxFirstVisibleItem to AX |
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[41] | 146 | push cx |
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| 147 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 148 | mov ax, [bp+MENUINIT.wItems] |
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| 149 | sub ax, cx |
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| 150 | pop cx |
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| 151 | |
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[181] | 152 | add dx, cx |
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| 153 | jns .DXisPositive |
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| 154 | cwd ; This won't work if MaxFirstVisibleItem > 32767 |
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| 155 | |
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[369] | 156 | ALIGN MENU_JUMP_ALIGN |
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[181] | 157 | .DXisPositive: |
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| 158 | cmp ax, dx |
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| 159 | jb .AXisLessThanDX |
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| 160 | xchg dx, ax |
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[41] | 161 | |
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[369] | 162 | ALIGN MENU_JUMP_ALIGN |
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[181] | 163 | .AXisLessThanDX: |
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| 164 | mov [bp+MENU.wFirstVisibleItem], ax |
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| 165 | call MenuText_RefreshAllItems |
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[41] | 166 | |
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[369] | 167 | ALIGN MENU_JUMP_ALIGN |
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[181] | 168 | .HighlightNewItemOnCX: |
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| 169 | jmp MenuEvent_HighlightItemFromCX |
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[41] | 170 | |
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| 171 | |
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| 172 | ;-------------------------------------------------------------------- |
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[105] | 173 | ; MenuScrollbars_IsItemInCXonVisiblePage |
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[41] | 174 | ; Parameters |
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| 175 | ; CX: Item whose visibility is to be checked |
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| 176 | ; SS:BP: Ptr to MENU |
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| 177 | ; Returns: |
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| 178 | ; CF: Set if item is on visible page |
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| 179 | ; Cleared if item is not on visible page |
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| 180 | ; Corrupts registers: |
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| 181 | ; AX |
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| 182 | ;-------------------------------------------------------------------- |
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[369] | 183 | ALIGN MENU_JUMP_ALIGN |
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[41] | 184 | MenuScrollbars_IsItemInCXonVisiblePage: |
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[133] | 185 | cmp [bp+MENU.wFirstVisibleItem], cx |
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| 186 | ja SHORT .ItemIsNotVisible |
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[41] | 187 | |
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| 188 | call MenuScrollbars_GetLastVisibleItemOnPageToAX |
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| 189 | cmp cx, ax |
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| 190 | ja SHORT .ItemIsNotVisible |
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| 191 | stc ; Item is visible |
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[369] | 192 | ALIGN MENU_JUMP_ALIGN, ret |
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[41] | 193 | .ItemIsNotVisible: |
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| 194 | ret |
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| 195 | |
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| 196 | |
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| 197 | ;-------------------------------------------------------------------- |
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[105] | 198 | ; MenuScrollbars_GetLastVisibleItemOnPageToAX |
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[41] | 199 | ; Parameters |
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| 200 | ; SS:BP: Ptr to MENU |
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| 201 | ; Returns: |
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| 202 | ; AX: Index of last visible item on page |
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| 203 | ; Corrupts registers: |
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| 204 | ; Nothing |
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| 205 | ;-------------------------------------------------------------------- |
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[369] | 206 | ALIGN MENU_JUMP_ALIGN |
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[41] | 207 | MenuScrollbars_GetLastVisibleItemOnPageToAX: |
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[181] | 208 | xchg cx, ax |
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[41] | 209 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX |
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| 210 | xchg ax, cx |
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| 211 | dec ax |
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| 212 | add ax, [bp+MENU.wFirstVisibleItem] |
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| 213 | ret |
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| 214 | |
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| 215 | |
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| 216 | ;-------------------------------------------------------------------- |
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| 217 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX |
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| 218 | ; Parameters |
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| 219 | ; SS:BP: Ptr to MENU |
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| 220 | ; Returns: |
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| 221 | ; CX: Currently visible items |
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| 222 | ; Corrupts registers: |
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| 223 | ; Nothing |
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| 224 | ;-------------------------------------------------------------------- |
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[369] | 225 | ALIGN MENU_JUMP_ALIGN |
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[41] | 226 | MenuScrollbars_GetActualVisibleItemsOnPageToCX: |
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| 227 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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[181] | 228 | cmp cx, [bp+MENUINIT.wItems] |
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| 229 | jb SHORT .Return |
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| 230 | mov cx, [bp+MENUINIT.wItems] |
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[369] | 231 | ALIGN MENU_JUMP_ALIGN, ret |
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[181] | 232 | .Return: |
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[41] | 233 | ret |
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| 234 | |
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| 235 | |
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| 236 | ;-------------------------------------------------------------------- |
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| 237 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 238 | ; Parameters |
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| 239 | ; SS:BP: Ptr to MENU |
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| 240 | ; Returns: |
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| 241 | ; CX: Maximum number of visible items |
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| 242 | ; Corrupts registers: |
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| 243 | ; Nothing |
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| 244 | ;-------------------------------------------------------------------- |
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[369] | 245 | ALIGN MENU_JUMP_ALIGN |
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[41] | 246 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX: |
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[293] | 247 | eMOVZX cx, [bp+MENUINIT.bHeight] |
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[41] | 248 | sub cl, [bp+MENUINIT.bTitleLines] |
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| 249 | sub cl, [bp+MENUINIT.bInfoLines] |
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| 250 | sub cl, MENU_VERTICAL_BORDER_LINES |
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| 251 | ret |
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