| 1 | ; File name : menucrsr.asm
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| 2 | ; Project name : Menu library
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| 3 | ; Created date : 10.11.2009
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| 4 | ; Last update : 17.1.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : ASM library to menu system.
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| 7 | ; Contains menu cursor functions.
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| 8 |
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| 9 | ;--------------- Equates -----------------------------
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| 10 |
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| 11 | W_OFF_CRSR_STR EQU 0102h ; User string cursor offset
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| 12 |
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| 13 |
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| 14 | ;-------------- Private global variables -------------
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| 15 | ; Section containing initialized data
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| 16 | ;SECTION .data
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| 17 |
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| 18 |
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| 19 | ;-------------- Public functions ---------------------
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Returns X and Y coordinates for menu top left corner.
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| 25 | ; This function is used for calculating initial coordinates when
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| 26 | ; initializing menu for first time.
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| 27 | ; Parameters:
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| 28 | ; SS:BP: Ptr to MENUVARS
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| 29 | ; Returns:
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| 30 | ; DL: X coordinate for centered menu
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| 31 | ; DH: Y coordinate for centered menu
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| 32 | ; Corrupts registers:
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| 33 | ; AX, BX
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| 34 | ;--------------------------------------------------------------------
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| 35 | ALIGN JUMP_ALIGN
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| 36 | MenuCrsr_GetCenter:
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| 37 | mov ah, 0Fh ; Get Current Video Mode
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| 38 | int 10h
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| 39 | mov dl, ah ; Copy column count to DL
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| 40 | sub dl, [bp+MENUVARS.bWidth] ; Subtract menu width from columns
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| 41 | shr dl, 1 ; Divide by 2 for start X
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| 42 | mov dh, CNT_SCRN_ROW ; Load row count
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| 43 | sub dh, [bp+MENUVARS.bHeight] ; Subtract menu height from rows
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| 44 | shr dh, 1 ; Divide by 2 for start y
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| 45 | ret
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| 46 |
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| 47 |
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| 48 | ;--------------------------------------------------------------------
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| 49 | ; Sets cursor to start of menu string.
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| 50 | ; MenuCrsr_Point1stItem Sets cursor to first menuitem string
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| 51 | ; MenuCrsr_PointInfo Sets cursor to info string
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| 52 | ; MenuCrsr_PointTitle Sets cursor to title string
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| 53 | ; Parameters:
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| 54 | ; SS:BP: Ptr to MENUVARS
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| 55 | ; Returns:
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| 56 | ; Nothing
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| 57 | ; Corrupts registers:
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| 58 | ; AX, BX, CX, DX
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| 59 | ;--------------------------------------------------------------------
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| 60 | ALIGN JUMP_ALIGN
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| 61 | MenuCrsr_Point1stItem:
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| 62 | xor dx, dx ; Zero DX
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| 63 | call MenuCrsr_PointItemBrdr ; Point to item border (left)
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| 64 | mov cx, W_OFF_CRSR_STR & 0FFh ; Offset to user string (move X only)
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| 65 | jmp MenuCrsr_Move ; Move cursor
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| 66 | ALIGN JUMP_ALIGN
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| 67 | MenuCrsr_PointInfo:
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| 68 | xor dx, dx ; Zero DX
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| 69 | call MenuCrsr_PointNfoBrdr ; Point to Info border (top left)
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| 70 | mov cx, W_OFF_CRSR_STR ; Movement from border to user str
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| 71 | jmp MenuCrsr_Move ; Move cursor
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| 72 | ALIGN JUMP_ALIGN
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| 73 | MenuCrsr_PointTitle:
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| 74 | xor dx, dx ; Zero DX
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| 75 | call MenuCrsr_PointTitleBrdr ; Point to Title border (top left)
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| 76 | mov cx, W_OFF_CRSR_STR ; Movement from border to user str
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| 77 | jmp MenuCrsr_Move ; Move cursor
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| 78 |
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| 79 |
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| 80 | ;--------------------------------------------------------------------
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| 81 | ; Sets cursor to start of wanted menuitem string.
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| 82 | ;
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| 83 | ; MenuCrsr_PointNthItem
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| 84 | ; Parameters:
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| 85 | ; CX: Menuitem index where to set cursor
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| 86 | ; SS:BP: Ptr to MENUVARS
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| 87 | ; Returns:
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| 88 | ; Nothing
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| 89 | ; Corrupts registers:
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| 90 | ; AX, BX, DX
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| 91 | ;--------------------------------------------------------------------
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| 92 | ALIGN JUMP_ALIGN
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| 93 | MenuCrsr_PointNthItem:
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| 94 | push cx
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| 95 | push cx
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| 96 | call MenuCrsr_Point1stItem ; Point to topmost menuitem
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| 97 | pop cx
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| 98 | sub cx, [bp+MENUVARS.wItemTop] ; Number of newlines needed
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| 99 | jcxz .Return
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| 100 | ALIGN JUMP_ALIGN
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| 101 | .NewLineLoop:
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| 102 | call MenuDraw_NewlineStr
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| 103 | loop .NewLineLoop
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| 104 | ALIGN JUMP_ALIGN
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| 105 | .Return:
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| 106 | pop cx
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| 107 | ret
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| 108 |
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| 109 |
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| 110 | ;--------------------------------------------------------------------
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| 111 | ; Sets cursor to start of menu border.
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| 112 | ; MenuCrsr_PointBelowBrdr Sets cursor to below menu bottom border
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| 113 | ; MenuCrsr_PointNfoBrdr Sets cursor to top left corner of info borders
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| 114 | ; MenuCrsr_PointItemBrdr Sets cursor to first menuitem left border
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| 115 | ; MenuCrsr_PointTitleBrdr Sets cursor to top left corner of title borders
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| 116 | ; Parameters:
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| 117 | ; DX: 0
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| 118 | ; SS:BP: Ptr to MENUVARS
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| 119 | ; Returns:
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| 120 | ; Nothing
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| 121 | ; Corrupts registers:
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| 122 | ; AX, BX, DX
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| 123 | ;--------------------------------------------------------------------
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| 124 | ALIGN JUMP_ALIGN
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| 125 | MenuCrsr_PointBelowBrdr:
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| 126 | mov dh, [bp+MENUVARS.bInfoH] ; Load info height without borders
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| 127 | test dh, dh ; Info displayed?
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| 128 | jz .BottomOnly ; If not, continue
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| 129 | inc dh ; Increment Y for top border
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| 130 | ALIGN JUMP_ALIGN
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| 131 | .BottomOnly:
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| 132 | inc dh ; Increment Y for bottom border
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| 133 | ALIGN JUMP_ALIGN
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| 134 | MenuCrsr_PointNfoBrdr:
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| 135 | add dh, [bp+MENUVARS.bVisCnt] ; Load max number of visible menuitems
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| 136 | ALIGN JUMP_ALIGN
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| 137 | MenuCrsr_PointItemBrdr:
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| 138 | inc dh ; Add title top border
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| 139 | mov al, [bp+MENUVARS.bTitleH] ; Load title height
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| 140 | add dh, al ; Add title height to DH
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| 141 | test al, al ; Title visible?
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| 142 | jz MenuCrsr_PointTitleBrdr ; If not, jump to set cursor
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| 143 | inc dh ; Title bottom border
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| 144 | ALIGN JUMP_ALIGN
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| 145 | MenuCrsr_PointTitleBrdr:
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| 146 | add dx, [bp+MENUVARS.wInitCrsr] ; Add initial cursor position
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| 147 | ; Fall to MenuCrsr_SetCursor
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| 148 |
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| 149 |
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| 150 | ;--------------------------------------------------------------------
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| 151 | ; Sets cursor position in DX.
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| 152 | ; Parameters:
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| 153 | ; DL: Cursor X coordinate
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| 154 | ; DH: Cursor Y coordinate
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| 155 | ; Returns:
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| 156 | ; Nothing
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| 157 | ; Corrupts registers:
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| 158 | ; AX, BX
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| 159 | ;--------------------------------------------------------------------
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| 160 | ALIGN JUMP_ALIGN
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| 161 | MenuCrsr_SetCursor:
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| 162 | xor bx, bx ; Zero page
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| 163 | mov ah, 02h ; Set Cursor Position and Size
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| 164 | int 10h
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| 165 | ret
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| 166 |
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| 167 |
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| 168 | ;--------------------------------------------------------------------
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| 169 | ; Return cursor position in DX.
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| 170 | ; Parameters:
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| 171 | ; Nothing
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| 172 | ; Returns:
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| 173 | ; CL: Cursor start scan line
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| 174 | ; CH: Cursor end scan line
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| 175 | ; DL: Cursor X coordinate
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| 176 | ; DH: Cursor Y coordinate
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| 177 | ; Corrupts registers:
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| 178 | ; AX, BX
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| 179 | ;--------------------------------------------------------------------
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| 180 | ALIGN JUMP_ALIGN
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| 181 | MenuCrsr_GetCursor:
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| 182 | xor bx, bx ; Zero page
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| 183 | mov ah, 03h ; Get Cursor Position and Size
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| 184 | int 10h
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| 185 | ret
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| 186 |
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| 187 |
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| 188 | ;--------------------------------------------------------------------
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| 189 | ; Moves cursor from current location.
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| 190 | ; Parameters:
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| 191 | ; CL: Cursor X coordinate movement (can be negative)
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| 192 | ; CH: Cursor Y coordinate movement (can be negative)
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| 193 | ; Returns:
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| 194 | ; Nothing
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| 195 | ; Corrupts registers:
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| 196 | ; AX, BX, DX
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| 197 | ;--------------------------------------------------------------------
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| 198 | ALIGN JUMP_ALIGN
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| 199 | MenuCrsr_Move:
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| 200 | push cx
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| 201 | call MenuCrsr_GetCursor ; Get cursor position to DX
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| 202 | pop cx
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| 203 | add dl, cl ; Move X
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| 204 | add dh, ch ; Move Y
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| 205 | jmp MenuCrsr_SetCursor
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| 206 |
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| 207 |
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| 208 | ;--------------------------------------------------------------------
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| 209 | ; Shows cursor that has been hidden.
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| 210 | ; Parameters:
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| 211 | ; Nothing
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| 212 | ; Returns:
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| 213 | ; Nothing
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| 214 | ; Corrupts registers:
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| 215 | ; AX, CX
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| 216 | ;--------------------------------------------------------------------
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| 217 | ALIGN JUMP_ALIGN
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| 218 | MenuCrsr_Show:
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| 219 | mov cx, 0607h ; Two line cursor near or at the bottom of cell
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| 220 | jmp MenuCrsr_SetShape
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| 221 |
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| 222 |
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| 223 | ;--------------------------------------------------------------------
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| 224 | ; Hides cursor.
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| 225 | ; Parameters:
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| 226 | ; Nothing
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| 227 | ; Returns:
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| 228 | ; Nothing
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| 229 | ; Corrupts registers:
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| 230 | ; AX, CX
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| 231 | ;--------------------------------------------------------------------
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| 232 | ALIGN JUMP_ALIGN
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| 233 | MenuCrsr_Hide:
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| 234 | mov cx, 2000h
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| 235 | ; Fall to MenuCrsr_SetShape
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| 236 |
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| 237 | ;--------------------------------------------------------------------
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| 238 | ; Sets cursor shape.
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| 239 | ; Parameters:
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| 240 | ; CL: Cursor start scan line
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| 241 | ; CH: Cursor end scan line
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| 242 | ; Returns:
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| 243 | ; Nothing
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| 244 | ; Corrupts registers:
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| 245 | ; AX
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| 246 | ;--------------------------------------------------------------------
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| 247 | ALIGN JUMP_ALIGN
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| 248 | MenuCrsr_SetShape:
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| 249 | mov ax, 0103h ; Set Text-Mode Cursor Shape
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| 250 | ; AL=assumed video mode to prevent lock ups on some BIOSes
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| 251 | int 10h
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| 252 | ret
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