| [41] | 1 | ; File name : MenuScrollbars.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 20.7.2010
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| [67] | 4 | ; Last update : 9.12.2010
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| [41] | 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for drawing scroll bars over menu borders.
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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 | ; MenuScrollbars_AreScrollbarsNeeded
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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 | ; CF: Set if scroll bars are needed
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| 17 | ; Cleared if no scroll bars needed
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| 18 | ; Corrupts registers:
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| [67] | 19 | ; AX
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| [41] | 20 | ;--------------------------------------------------------------------
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| 21 | ALIGN JUMP_ALIGN
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| 22 | MenuScrollbars_AreScrollbarsNeeded:
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| [67] | 23 | xchg ax, cx
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| [41] | 24 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 25 | cmp cx, [bp+MENUINIT.wItems] ; Set CF if max visible < total items
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| [67] | 26 | xchg cx, ax
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| [41] | 27 | ret
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| 28 |
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| 29 |
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| 30 | ;--------------------------------------------------------------------
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| 31 | ; MenuScrollbars_GetScrollCharacterToALForLineInDI
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| 32 | ; Parameters
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| 33 | ; DI: Index of item line to draw
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| 34 | ; SS:BP: Ptr to MENU
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| 35 | ; Returns:
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| 36 | ; AL: Scroll track or thumb character
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| 37 | ; Corrupts registers:
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| 38 | ; AH, CX, DX
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| 39 | ;--------------------------------------------------------------------
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| 40 | ALIGN JUMP_ALIGN
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| 41 | MenuScrollbars_GetScrollCharacterToALForLineInDI:
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| 42 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 43 | call .GetFirstThumbLineToAX
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| 44 | cmp di, ax ; Before first thumb line?
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| 45 | jb SHORT .ReturnTrackCharacter
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| 46 | call .GetLastThumbLineToAX
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| 47 | cmp di, ax ; After last thumb line?
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| 48 | ja SHORT .ReturnTrackCharacter
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| 49 | mov al, SCROLL_THUMB_CHARACTER
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| 50 | ret
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| 51 | ALIGN JUMP_ALIGN
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| 52 | .ReturnTrackCharacter:
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| 53 | mov al, SCROLL_TRACK_CHARACTER
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| 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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| 65 | ;--------------------------------------------------------------------
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| 66 | ALIGN JUMP_ALIGN
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| 67 | .GetLastThumbLineToAX:
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| 68 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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| 69 | jmp SHORT .CalculateFirstOrLastThumbLineToAX
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| 70 |
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| 71 | ;--------------------------------------------------------------------
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| 72 | ; .GetFirstThumbLineToAX
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| 73 | ; Parameters
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| 74 | ; CX: Max visible items on page
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| 75 | ; SS:BP: Ptr to MENU
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| 76 | ; Returns:
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| 77 | ; AX: Item line for first thumb character
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| 78 | ; Corrupts registers:
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| 79 | ; CX, DX
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| 80 | ;--------------------------------------------------------------------
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| 81 | ALIGN JUMP_ALIGN
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| 82 | .GetFirstThumbLineToAX:
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| 83 | mov ax, [bp+MENU.wFirstVisibleItem]
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| 84 | .CalculateFirstOrLastThumbLineToAX:
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| 85 | mul cx
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| 86 | div WORD [bp+MENUINIT.wItems]
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| 87 | ret ; (Visible items on page * First visible item on page) / total items
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| 88 |
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| 89 |
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| 90 | ;--------------------------------------------------------------------
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| 91 | ; MenuScrollbars_MoveHighlightedItemByAX
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| 92 | ; Parameters
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| 93 | ; AX: Signed offset to new item to be highlighted
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| 94 | ; SS:BP: Ptr to MENU
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| 95 | ; Returns:
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| 96 | ; Nothing
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| 97 | ; Corrupts registers:
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| 98 | ; AX, BX, CX, DX, SI, DI
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| 99 | ;--------------------------------------------------------------------
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| 100 | ALIGN JUMP_ALIGN
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| 101 | MenuScrollbars_MoveHighlightedItemByAX:
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| [52] | 102 | mov cx, [bp+MENUINIT.wHighlightedItem]
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| [41] | 103 | add cx, ax
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| 104 | call .RotateItemInCX
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| 105 | ; Fall to .ScrollPageForNewItemInCX
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| 106 |
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| 107 | ;--------------------------------------------------------------------
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| 108 | ; .ScrollPageForNewItemInCX
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| 109 | ; Parameters
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| 110 | ; CX: New item to be highlighted
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| 111 | ; SS:BP: Ptr to MENU
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| 112 | ; Returns:
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| 113 | ; Nothing
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| 114 | ; Corrupts registers:
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| 115 | ; AX, BX, CX, DX, SI, DI
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| 116 | ;--------------------------------------------------------------------
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| 117 | .ScrollPageForNewItemInCX:
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| 118 | call MenuScrollbars_IsItemInCXonVisiblePage
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| 119 | jc SHORT .HighlightNewItemOnCX
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| 120 |
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| 121 | mov dx, [bp+MENU.wFirstVisibleItem]
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| [52] | 122 | sub dx, [bp+MENUINIT.wHighlightedItem]
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| [41] | 123 | add dx, cx
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| 124 | MAX_S dx, 0
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| 125 | call .GetMaxFirstVisibleItemToAX
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| 126 | MIN_U ax, dx
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| 127 | mov [bp+MENU.wFirstVisibleItem], ax
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| 128 | call MenuText_RefreshAllItems
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| 129 |
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| 130 | ALIGN JUMP_ALIGN
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| 131 | .HighlightNewItemOnCX:
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| 132 | jmp MenuEvent_HighlightItemFromCX
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| 133 |
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| 134 | ;--------------------------------------------------------------------
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| 135 | ; .GetMaxFirstVisibleItemToAX
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| 136 | ; Parameters
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| 137 | ; SS:BP: Ptr to MENU
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| 138 | ; Returns:
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| 139 | ; AX: Max first visible item
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| 140 | ; Corrupts registers:
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| 141 | ; Nothing
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| 142 | ;--------------------------------------------------------------------
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| 143 | ALIGN JUMP_ALIGN
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| 144 | .GetMaxFirstVisibleItemToAX:
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| 145 | push cx
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| 146 |
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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 |
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| 151 | pop cx
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| 152 | ret
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| 153 |
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| 154 | ;--------------------------------------------------------------------
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| 155 | ; .RotateItemInCX
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| 156 | ; Parameters
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| 157 | ; CX: Possibly under of overflown item to be rotated
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| 158 | ; SS:BP: Ptr to MENU
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| 159 | ; Returns:
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| 160 | ; CX: Valid item index
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| 161 | ; Corrupts registers:
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| 162 | ; DX
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| 163 | ;--------------------------------------------------------------------
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| 164 | ALIGN JUMP_ALIGN
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| 165 | .RotateItemInCX:
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| 166 | mov dx, [bp+MENUINIT.wItems]
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| 167 | cmp cx, BYTE 0
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| 168 | jl SHORT .RotateNegativeItemInCX
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| 169 | cmp cx, dx
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| 170 | jae SHORT .RotatePositiveItemInCX
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| 171 | ret
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| 172 |
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| 173 | ALIGN JUMP_ALIGN
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| 174 | .RotatePositiveItemInCX:
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| 175 | sub cx, dx
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| 176 | ;jae SHORT .RotatePositiveItemInCX ; Not needed by scrolling
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| 177 | ret
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| 178 |
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| 179 | ALIGN JUMP_ALIGN
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| 180 | .RotateNegativeItemInCX:
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| 181 | add cx, dx
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| 182 | ;js SHORT .RotateNegativeItemInCX ; Not needed by scrolling
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| 183 | ret
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| 184 |
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| 185 |
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| 186 | ;--------------------------------------------------------------------
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| 187 | ; .IsItemInCXonVisiblePage
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| 188 | ; Parameters
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| 189 | ; CX: Item whose visibility is to be checked
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| 190 | ; SS:BP: Ptr to MENU
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| 191 | ; Returns:
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| 192 | ; CF: Set if item is on visible page
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| 193 | ; Cleared if item is not on visible page
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| 194 | ; Corrupts registers:
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| 195 | ; AX
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| 196 | ;--------------------------------------------------------------------
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| 197 | ALIGN JUMP_ALIGN
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| 198 | MenuScrollbars_IsItemInCXonVisiblePage:
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| 199 | cmp cx, [bp+MENUINIT.wItems]
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| 200 | jae SHORT .ItemIsNotVisible
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| 201 |
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| 202 | cmp cx, [bp+MENU.wFirstVisibleItem]
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| 203 | jb SHORT .ItemIsNotVisible
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| 204 |
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| 205 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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| 206 | cmp cx, ax
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| 207 | ja SHORT .ItemIsNotVisible
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| 208 | stc ; Item is visible
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| 209 | ret
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| 210 | ALIGN JUMP_ALIGN
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| 211 | .ItemIsNotVisible:
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| 212 | clc
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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 | ; MenuLocation_GetLastVisibleItemOnPageToAX
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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 | ; AX: Index of last visible item on page
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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_GetLastVisibleItemOnPageToAX:
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| 227 | push cx
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| 228 |
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| 229 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX
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| 230 | xchg ax, cx
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| 231 | dec ax
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| 232 | add ax, [bp+MENU.wFirstVisibleItem]
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| 233 |
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| 234 | pop cx
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| 235 | ret
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| 236 |
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| 237 |
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| 238 | ;--------------------------------------------------------------------
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| 239 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX
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| 240 | ; Parameters
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| 241 | ; SS:BP: Ptr to MENU
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| 242 | ; Returns:
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| 243 | ; CX: Currently visible items
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| 244 | ; Corrupts registers:
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| 245 | ; Nothing
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| 246 | ;--------------------------------------------------------------------
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| 247 | ALIGN JUMP_ALIGN
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| 248 | MenuScrollbars_GetActualVisibleItemsOnPageToCX:
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| 249 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 250 | MIN_U cx, [bp+MENUINIT.wItems]
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| 251 | ret
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| 252 |
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| 253 |
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| 254 | ;--------------------------------------------------------------------
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| 255 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 256 | ; Parameters
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| 257 | ; SS:BP: Ptr to MENU
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| 258 | ; Returns:
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| 259 | ; CX: Maximum number of visible items
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| 260 | ; Corrupts registers:
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| 261 | ; Nothing
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| 262 | ;--------------------------------------------------------------------
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| 263 | ALIGN JUMP_ALIGN
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| 264 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX:
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| 265 | eMOVZX cx, BYTE [bp+MENUINIT.bHeight]
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| 266 | sub cl, [bp+MENUINIT.bTitleLines]
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| 267 | sub cl, [bp+MENUINIT.bInfoLines]
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| 268 | sub cl, MENU_VERTICAL_BORDER_LINES
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| 269 | ret
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