[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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[376] | 4 | ; |
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[491] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[491] | 12 | ; |
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[376] | 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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[491] | 16 | ; GNU General Public License for more details. |
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[376] | 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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[491] | 20 | |
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[41] | 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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[67] | 32 | ; AX |
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[41] | 33 | ;-------------------------------------------------------------------- |
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[369] | 34 | ALIGN MENU_JUMP_ALIGN |
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[41] | 35 | MenuScrollbars_AreScrollbarsNeeded: |
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[67] | 36 | xchg ax, cx |
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[41] | 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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[67] | 39 | xchg cx, ax |
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[41] | 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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[369] | 53 | ALIGN MENU_JUMP_ALIGN |
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[41] | 54 | MenuScrollbars_GetScrollCharacterToALForLineInDI: |
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| 55 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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[181] | 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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[41] | 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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[181] | 63 | cmp ax, di ; After last thumb line? |
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[369] | 64 | ALIGN MENU_JUMP_ALIGN |
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[41] | 65 | .ReturnTrackCharacter: |
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| 66 | mov al, SCROLL_TRACK_CHARACTER |
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[181] | 67 | jb SHORT .Return |
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| 68 | mov al, SCROLL_THUMB_CHARACTER |
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[369] | 69 | ALIGN MENU_JUMP_ALIGN, ret |
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[181] | 70 | .Return: |
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[41] | 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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[491] | 81 | ; DX |
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[133] | 82 | ;-------------------------------------------------------------------- |
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[369] | 83 | ALIGN MENU_JUMP_ALIGN |
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[41] | 84 | .GetLastThumbLineToAX: |
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| 85 | call MenuScrollbars_GetLastVisibleItemOnPageToAX |
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[181] | 86 | ; Fall to .CalculateFirstOrLastThumbLineToAX |
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[41] | 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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[181] | 89 | ; .CalculateFirstOrLastThumbLineToAX |
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[41] | 90 | ; Parameters |
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[181] | 91 | ; AX: Index of first or last visible item on page |
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[41] | 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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[491] | 97 | ; DX |
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[41] | 98 | ;-------------------------------------------------------------------- |
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[369] | 99 | ALIGN MENU_JUMP_ALIGN |
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[41] | 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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[369] | 116 | ALIGN MENU_JUMP_ALIGN |
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[41] | 117 | MenuScrollbars_MoveHighlightedItemByAX: |
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[181] | 118 | mov dx, [bp+MENUINIT.wItems] |
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[568] | 119 | add ax, [bp+MENUINIT.wHighlightedItem] |
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| 120 | xchg cx, ax |
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[181] | 121 | js SHORT .RotateNegativeItemInCX |
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| 122 | sub cx, dx |
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| 123 | jae SHORT .ScrollPageForNewItemInCX |
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| 124 | |
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[369] | 125 | ALIGN MENU_JUMP_ALIGN |
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[181] | 126 | .RotateNegativeItemInCX: |
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| 127 | add cx, dx |
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[41] | 128 | ; Fall to .ScrollPageForNewItemInCX |
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| 129 | |
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| 130 | ;-------------------------------------------------------------------- |
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| 131 | ; .ScrollPageForNewItemInCX |
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| 132 | ; Parameters |
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| 133 | ; CX: New item to be highlighted |
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| 134 | ; SS:BP: Ptr to MENU |
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| 135 | ; Returns: |
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| 136 | ; Nothing |
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| 137 | ; Corrupts registers: |
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| 138 | ; AX, BX, CX, DX, SI, DI |
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| 139 | ;-------------------------------------------------------------------- |
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[369] | 140 | ALIGN MENU_JUMP_ALIGN |
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[41] | 141 | .ScrollPageForNewItemInCX: |
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| 142 | call MenuScrollbars_IsItemInCXonVisiblePage |
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| 143 | jc SHORT .HighlightNewItemOnCX |
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| 144 | |
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| 145 | mov dx, [bp+MENU.wFirstVisibleItem] |
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[52] | 146 | sub dx, [bp+MENUINIT.wHighlightedItem] |
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[41] | 147 | |
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[181] | 148 | ; Get MaxFirstVisibleItem to AX |
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[41] | 149 | push cx |
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| 150 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 151 | mov ax, [bp+MENUINIT.wItems] |
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| 152 | sub ax, cx |
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| 153 | pop cx |
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| 154 | |
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[181] | 155 | add dx, cx |
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| 156 | jns .DXisPositive |
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| 157 | cwd ; This won't work if MaxFirstVisibleItem > 32767 |
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| 158 | |
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[369] | 159 | ALIGN MENU_JUMP_ALIGN |
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[181] | 160 | .DXisPositive: |
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| 161 | cmp ax, dx |
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| 162 | jb .AXisLessThanDX |
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| 163 | xchg dx, ax |
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[41] | 164 | |
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[369] | 165 | ALIGN MENU_JUMP_ALIGN |
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[181] | 166 | .AXisLessThanDX: |
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| 167 | mov [bp+MENU.wFirstVisibleItem], ax |
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| 168 | call MenuText_RefreshAllItems |
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[41] | 169 | |
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[369] | 170 | ALIGN MENU_JUMP_ALIGN |
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[181] | 171 | .HighlightNewItemOnCX: |
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| 172 | jmp MenuEvent_HighlightItemFromCX |
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[41] | 173 | |
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| 174 | |
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| 175 | ;-------------------------------------------------------------------- |
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[105] | 176 | ; MenuScrollbars_IsItemInCXonVisiblePage |
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[41] | 177 | ; Parameters |
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| 178 | ; CX: Item whose visibility is to be checked |
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| 179 | ; SS:BP: Ptr to MENU |
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| 180 | ; Returns: |
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| 181 | ; CF: Set if item is on visible page |
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| 182 | ; Cleared if item is not on visible page |
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| 183 | ; Corrupts registers: |
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| 184 | ; AX |
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| 185 | ;-------------------------------------------------------------------- |
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[369] | 186 | ALIGN MENU_JUMP_ALIGN |
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[41] | 187 | MenuScrollbars_IsItemInCXonVisiblePage: |
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[133] | 188 | cmp [bp+MENU.wFirstVisibleItem], cx |
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| 189 | ja SHORT .ItemIsNotVisible |
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[41] | 190 | |
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| 191 | call MenuScrollbars_GetLastVisibleItemOnPageToAX |
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| 192 | cmp cx, ax |
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| 193 | ja SHORT .ItemIsNotVisible |
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| 194 | stc ; Item is visible |
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[369] | 195 | ALIGN MENU_JUMP_ALIGN, ret |
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[41] | 196 | .ItemIsNotVisible: |
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| 197 | ret |
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| 198 | |
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| 199 | |
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| 200 | ;-------------------------------------------------------------------- |
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[105] | 201 | ; MenuScrollbars_GetLastVisibleItemOnPageToAX |
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[41] | 202 | ; Parameters |
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| 203 | ; SS:BP: Ptr to MENU |
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| 204 | ; Returns: |
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| 205 | ; AX: Index of last visible item on page |
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| 206 | ; Corrupts registers: |
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| 207 | ; Nothing |
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| 208 | ;-------------------------------------------------------------------- |
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[369] | 209 | ALIGN MENU_JUMP_ALIGN |
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[41] | 210 | MenuScrollbars_GetLastVisibleItemOnPageToAX: |
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[181] | 211 | xchg cx, ax |
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[41] | 212 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX |
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| 213 | xchg ax, cx |
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| 214 | dec ax |
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| 215 | add ax, [bp+MENU.wFirstVisibleItem] |
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| 216 | ret |
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| 217 | |
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| 218 | |
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| 219 | ;-------------------------------------------------------------------- |
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| 220 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX |
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| 221 | ; Parameters |
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| 222 | ; SS:BP: Ptr to MENU |
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| 223 | ; Returns: |
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| 224 | ; CX: Currently visible items |
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| 225 | ; Corrupts registers: |
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| 226 | ; Nothing |
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| 227 | ;-------------------------------------------------------------------- |
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[369] | 228 | ALIGN MENU_JUMP_ALIGN |
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[41] | 229 | MenuScrollbars_GetActualVisibleItemsOnPageToCX: |
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| 230 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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[181] | 231 | cmp cx, [bp+MENUINIT.wItems] |
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| 232 | jb SHORT .Return |
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| 233 | mov cx, [bp+MENUINIT.wItems] |
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[369] | 234 | ALIGN MENU_JUMP_ALIGN, ret |
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[181] | 235 | .Return: |
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[41] | 236 | ret |
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| 237 | |
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| 238 | |
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| 239 | ;-------------------------------------------------------------------- |
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| 240 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX |
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| 241 | ; Parameters |
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| 242 | ; SS:BP: Ptr to MENU |
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| 243 | ; Returns: |
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| 244 | ; CX: Maximum number of visible items |
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| 245 | ; Corrupts registers: |
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| 246 | ; Nothing |
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| 247 | ;-------------------------------------------------------------------- |
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[369] | 248 | ALIGN MENU_JUMP_ALIGN |
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[41] | 249 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX: |
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[583] | 250 | mov cx, -MENU_VERTICAL_BORDER_LINES & 0FFh |
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| 251 | add cl, [bp+MENUINIT.bHeight] |
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[41] | 252 | sub cl, [bp+MENUINIT.bTitleLines] |
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| 253 | sub cl, [bp+MENUINIT.bInfoLines] |
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| 254 | ret |
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