| [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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| 17 | ALIGN JUMP_ALIGN
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| 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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| 36 | ALIGN JUMP_ALIGN
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| 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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| [41] | 47 | ALIGN JUMP_ALIGN
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| 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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| 52 | ALIGN JUMP_ALIGN, ret
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| 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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| [41] | 66 | ALIGN JUMP_ALIGN
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| 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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| 82 | ALIGN JUMP_ALIGN
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| 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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| 99 | ALIGN JUMP_ALIGN
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| 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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| 122 | ALIGN JUMP_ALIGN
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| 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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| [181] | 137 | ALIGN 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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| [41] | 156 | ALIGN 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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| 162 | ALIGN 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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| 167 | ALIGN 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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| 183 | ALIGN JUMP_ALIGN
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| 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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| [133] | 192 | ALIGN 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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| 206 | ALIGN JUMP_ALIGN
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| 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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| 225 | ALIGN JUMP_ALIGN
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| 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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| 231 | ALIGN JUMP_ALIGN, ret
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| 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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| 245 | ALIGN JUMP_ALIGN
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| 246 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX:
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| 247 | eMOVZX cx, BYTE [bp+MENUINIT.bHeight]
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| 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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