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, 2011-2012 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 | ; CX, 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 | ; CX, 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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