| 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 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 |
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| 21 | ; Section containing code
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| 22 | SECTION .text
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| 23 |
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| 24 | ;--------------------------------------------------------------------
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| 25 | ; MenuScrollbars_AreScrollbarsNeeded
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| 26 | ; Parameters
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| 27 | ; SS:BP: Ptr to MENU
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| 28 | ; Returns:
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| 29 | ; CF: Set if scroll bars are needed
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| 30 | ; Cleared if no scroll bars needed
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| 31 | ; Corrupts registers:
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| 32 | ; AX
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| 33 | ;--------------------------------------------------------------------
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| 34 | ALIGN MENU_JUMP_ALIGN
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| 35 | MenuScrollbars_AreScrollbarsNeeded:
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| 36 | xchg ax, cx
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| 37 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 38 | cmp cx, [bp+MENUINIT.wItems] ; Set CF if max visible < total items
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| 39 | xchg cx, ax
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| 40 | ret
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| 41 |
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| 42 |
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| 43 | ;--------------------------------------------------------------------
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| 44 | ; MenuScrollbars_GetScrollCharacterToALForLineInDI
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| 45 | ; Parameters
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| 46 | ; DI: Index of item line to draw
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| 47 | ; SS:BP: Ptr to MENU
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| 48 | ; Returns:
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| 49 | ; AL: Scroll track or thumb character
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| 50 | ; Corrupts registers:
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| 51 | ; AH, CX, DX
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| 52 | ;--------------------------------------------------------------------
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| 53 | ALIGN MENU_JUMP_ALIGN
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| 54 | MenuScrollbars_GetScrollCharacterToALForLineInDI:
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| 55 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 56 | ; Get first thumb line to AX
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| 57 | mov ax, [bp+MENU.wFirstVisibleItem]
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| 58 | call .CalculateFirstOrLastThumbLineToAX
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| 59 |
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| 60 | cmp di, ax ; Before first thumb line?
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| 61 | jb SHORT .ReturnTrackCharacter
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| 62 | call .GetLastThumbLineToAX
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| 63 | cmp ax, di ; After last thumb line?
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| 64 | ALIGN MENU_JUMP_ALIGN
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| 65 | .ReturnTrackCharacter:
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| 66 | mov al, SCROLL_TRACK_CHARACTER
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| 67 | jb SHORT .Return
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| 68 | mov al, SCROLL_THUMB_CHARACTER
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| 69 | ALIGN MENU_JUMP_ALIGN, ret
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| 70 | .Return:
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| 71 | ret
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| 74 | ; .GetLastThumbLineToAX
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| 75 | ; Parameters
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| 76 | ; CX: Max visible items on page
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| 77 | ; SS:BP: Ptr to MENU
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| 78 | ; Returns:
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| 79 | ; AX: Item line for last thumb character
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| 80 | ; Corrupts registers:
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| 81 | ; DX
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN MENU_JUMP_ALIGN
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| 84 | .GetLastThumbLineToAX:
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| 85 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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| 86 | ; Fall to .CalculateFirstOrLastThumbLineToAX
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| 87 |
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| 88 | ;--------------------------------------------------------------------
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| 89 | ; .CalculateFirstOrLastThumbLineToAX
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| 90 | ; Parameters
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| 91 | ; AX: Index of first or last visible item on page
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| 92 | ; CX: Max visible items on page
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| 93 | ; SS:BP: Ptr to MENU
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| 94 | ; Returns:
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| 95 | ; AX: Item line for first thumb character
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| 96 | ; Corrupts registers:
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| 97 | ; DX
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| 98 | ;--------------------------------------------------------------------
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| 99 | ALIGN MENU_JUMP_ALIGN
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| 100 | .CalculateFirstOrLastThumbLineToAX:
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| 101 | mul cx
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| 102 | div WORD [bp+MENUINIT.wItems]
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| 103 | ret ; (Visible items on page * First visible item on page) / total items
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| 104 |
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| 105 |
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| 106 | ;--------------------------------------------------------------------
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| 107 | ; MenuScrollbars_MoveHighlightedItemByAX
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| 108 | ; Parameters
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| 109 | ; AX: Signed offset to new item to be highlighted
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| 110 | ; SS:BP: Ptr to MENU
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| 111 | ; Returns:
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| 112 | ; Nothing
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| 113 | ; Corrupts registers:
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| 114 | ; AX, BX, CX, DX, SI, DI
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| 115 | ;--------------------------------------------------------------------
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| 116 | ALIGN MENU_JUMP_ALIGN
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| 117 | MenuScrollbars_MoveHighlightedItemByAX:
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| 118 | mov cx, [bp+MENUINIT.wHighlightedItem]
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| 119 | add cx, ax
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| 120 | ; Fall to .RotateItemInCX
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| 121 |
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| 122 | ;--------------------------------------------------------------------
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| 123 | ; .RotateItemInCX
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| 124 | ; Parameters
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| 125 | ; CX: Possibly under of overflown item to be rotated
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| 126 | ; SS:BP: Ptr to MENU
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| 127 | ; Returns:
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| 128 | ; CX: Valid item index
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| 129 | ; Corrupts registers:
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| 130 | ; DX
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| 131 | ;--------------------------------------------------------------------
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| 132 | ;.RotateItemInCX:
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| 133 | mov dx, [bp+MENUINIT.wItems]
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| 134 | test cx, cx
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| 135 | js SHORT .RotateNegativeItemInCX
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| 136 | sub cx, dx
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| 137 | jae SHORT .ScrollPageForNewItemInCX
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| 138 |
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| 139 | ALIGN MENU_JUMP_ALIGN
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| 140 | .RotateNegativeItemInCX:
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| 141 | add cx, dx
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| 142 | ; Fall to .ScrollPageForNewItemInCX
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| 143 |
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| 144 | ;--------------------------------------------------------------------
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| 145 | ; .ScrollPageForNewItemInCX
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| 146 | ; Parameters
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| 147 | ; CX: New item to be highlighted
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| 148 | ; SS:BP: Ptr to MENU
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| 149 | ; Returns:
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| 150 | ; Nothing
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| 151 | ; Corrupts registers:
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| 152 | ; AX, BX, CX, DX, SI, DI
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| 153 | ;--------------------------------------------------------------------
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| 154 | ALIGN MENU_JUMP_ALIGN
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| 155 | .ScrollPageForNewItemInCX:
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| 156 | call MenuScrollbars_IsItemInCXonVisiblePage
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| 157 | jc SHORT .HighlightNewItemOnCX
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| 158 |
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| 159 | mov dx, [bp+MENU.wFirstVisibleItem]
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| 160 | sub dx, [bp+MENUINIT.wHighlightedItem]
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| 161 |
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| 162 | ; Get MaxFirstVisibleItem to AX
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| 163 | push cx
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| 164 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 165 | mov ax, [bp+MENUINIT.wItems]
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| 166 | sub ax, cx
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| 167 | pop cx
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| 168 |
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| 169 | add dx, cx
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| 170 | jns .DXisPositive
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| 171 | cwd ; This won't work if MaxFirstVisibleItem > 32767
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| 172 |
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| 173 | ALIGN MENU_JUMP_ALIGN
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| 174 | .DXisPositive:
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| 175 | cmp ax, dx
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| 176 | jb .AXisLessThanDX
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| 177 | xchg dx, ax
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| 178 |
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| 179 | ALIGN MENU_JUMP_ALIGN
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| 180 | .AXisLessThanDX:
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| 181 | mov [bp+MENU.wFirstVisibleItem], ax
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| 182 | call MenuText_RefreshAllItems
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| 183 |
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| 184 | ALIGN MENU_JUMP_ALIGN
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| 185 | .HighlightNewItemOnCX:
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| 186 | jmp MenuEvent_HighlightItemFromCX
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| 187 |
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| 188 |
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| 189 | ;--------------------------------------------------------------------
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| 190 | ; MenuScrollbars_IsItemInCXonVisiblePage
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| 191 | ; Parameters
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| 192 | ; CX: Item whose visibility is to be checked
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| 193 | ; SS:BP: Ptr to MENU
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| 194 | ; Returns:
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| 195 | ; CF: Set if item is on visible page
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| 196 | ; Cleared if item is not on visible page
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| 197 | ; Corrupts registers:
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| 198 | ; AX
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| 199 | ;--------------------------------------------------------------------
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| 200 | ALIGN MENU_JUMP_ALIGN
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| 201 | MenuScrollbars_IsItemInCXonVisiblePage:
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| 202 | cmp [bp+MENU.wFirstVisibleItem], cx
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| 203 | ja 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 | ALIGN MENU_JUMP_ALIGN, ret
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| 210 | .ItemIsNotVisible:
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| 211 | ret
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| 212 |
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| 213 |
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| 214 | ;--------------------------------------------------------------------
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| 215 | ; MenuScrollbars_GetLastVisibleItemOnPageToAX
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| 216 | ; Parameters
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| 217 | ; SS:BP: Ptr to MENU
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| 218 | ; Returns:
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| 219 | ; AX: Index of last visible item on page
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| 220 | ; Corrupts registers:
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| 221 | ; Nothing
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| 222 | ;--------------------------------------------------------------------
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| 223 | ALIGN MENU_JUMP_ALIGN
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| 224 | MenuScrollbars_GetLastVisibleItemOnPageToAX:
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| 225 | xchg cx, ax
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| 226 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX
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| 227 | xchg ax, cx
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| 228 | dec ax
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| 229 | add ax, [bp+MENU.wFirstVisibleItem]
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| 230 | ret
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| 231 |
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| 232 |
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| 233 | ;--------------------------------------------------------------------
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| 234 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX
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| 235 | ; Parameters
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| 236 | ; SS:BP: Ptr to MENU
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| 237 | ; Returns:
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| 238 | ; CX: Currently visible items
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| 239 | ; Corrupts registers:
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| 240 | ; Nothing
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| 241 | ;--------------------------------------------------------------------
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| 242 | ALIGN MENU_JUMP_ALIGN
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| 243 | MenuScrollbars_GetActualVisibleItemsOnPageToCX:
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| 244 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 245 | cmp cx, [bp+MENUINIT.wItems]
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| 246 | jb SHORT .Return
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| 247 | mov cx, [bp+MENUINIT.wItems]
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| 248 | ALIGN MENU_JUMP_ALIGN, ret
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| 249 | .Return:
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| 250 | ret
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| 251 |
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| 252 |
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| 253 | ;--------------------------------------------------------------------
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| 254 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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| 255 | ; Parameters
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| 256 | ; SS:BP: Ptr to MENU
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| 257 | ; Returns:
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| 258 | ; CX: Maximum number of visible items
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| 259 | ; Corrupts registers:
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| 260 | ; Nothing
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| 261 | ;--------------------------------------------------------------------
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| 262 | ALIGN MENU_JUMP_ALIGN
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| 263 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX:
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| 264 | eMOVZX cx, [bp+MENUINIT.bHeight]
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| 265 | sub cl, [bp+MENUINIT.bTitleLines]
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| 266 | sub cl, [bp+MENUINIT.bInfoLines]
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| 267 | sub cl, MENU_VERTICAL_BORDER_LINES
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| 268 | ret
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