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 | ; Section containing code
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5 | SECTION .text
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6 |
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7 | ;--------------------------------------------------------------------
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8 | ; MenuScrollbars_AreScrollbarsNeeded
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9 | ; Parameters
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10 | ; SS:BP: Ptr to MENU
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11 | ; Returns:
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12 | ; CF: Set if scroll bars are needed
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13 | ; Cleared if no scroll bars needed
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14 | ; Corrupts registers:
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15 | ; AX
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16 | ;--------------------------------------------------------------------
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17 | ALIGN JUMP_ALIGN
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18 | MenuScrollbars_AreScrollbarsNeeded:
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19 | xchg ax, cx
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20 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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21 | cmp cx, [bp+MENUINIT.wItems] ; Set CF if max visible < total items
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22 | xchg cx, ax
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23 | ret
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24 |
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25 |
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26 | ;--------------------------------------------------------------------
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27 | ; MenuScrollbars_GetScrollCharacterToALForLineInDI
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28 | ; Parameters
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29 | ; DI: Index of item line to draw
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30 | ; SS:BP: Ptr to MENU
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31 | ; Returns:
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32 | ; AL: Scroll track or thumb character
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33 | ; Corrupts registers:
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34 | ; AH, CX, DX
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35 | ;--------------------------------------------------------------------
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36 | ALIGN JUMP_ALIGN
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37 | MenuScrollbars_GetScrollCharacterToALForLineInDI:
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38 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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39 | call .GetFirstThumbLineToAX
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40 | cmp di, ax ; Before first thumb line?
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41 | jb SHORT .ReturnTrackCharacter
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42 | call .GetLastThumbLineToAX
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43 | cmp di, ax ; After last thumb line?
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44 | ja SHORT .ReturnTrackCharacter
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45 | mov al, SCROLL_THUMB_CHARACTER
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46 | ret
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47 | ALIGN JUMP_ALIGN
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48 | .ReturnTrackCharacter:
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49 | mov al, SCROLL_TRACK_CHARACTER
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50 | ret
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51 |
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52 | ;--------------------------------------------------------------------
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53 | ; .GetLastThumbLineToAX
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54 | ; Parameters
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55 | ; CX: Max visible items on page
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56 | ; SS:BP: Ptr to MENU
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57 | ; Returns:
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58 | ; AX: Item line for last thumb character
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59 | ; Corrupts registers:
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60 | ; CX, DX
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61 | ;--------------------------------------------------------------------
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62 | ALIGN JUMP_ALIGN
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63 | .GetLastThumbLineToAX:
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64 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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65 | jmp SHORT .CalculateFirstOrLastThumbLineToAX
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66 |
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67 | ;--------------------------------------------------------------------
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68 | ; .GetFirstThumbLineToAX
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69 | ; Parameters
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70 | ; CX: Max visible items on page
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71 | ; SS:BP: Ptr to MENU
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72 | ; Returns:
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73 | ; AX: Item line for first thumb character
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74 | ; Corrupts registers:
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75 | ; CX, DX
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76 | ;--------------------------------------------------------------------
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77 | ALIGN JUMP_ALIGN
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78 | .GetFirstThumbLineToAX:
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79 | mov ax, [bp+MENU.wFirstVisibleItem]
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80 | .CalculateFirstOrLastThumbLineToAX:
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81 | mul cx
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82 | div WORD [bp+MENUINIT.wItems]
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83 | ret ; (Visible items on page * First visible item on page) / total items
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84 |
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85 |
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86 | ;--------------------------------------------------------------------
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87 | ; MenuScrollbars_MoveHighlightedItemByAX
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88 | ; Parameters
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89 | ; AX: Signed offset to new item to be highlighted
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90 | ; SS:BP: Ptr to MENU
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91 | ; Returns:
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92 | ; Nothing
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93 | ; Corrupts registers:
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94 | ; AX, BX, CX, DX, SI, DI
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95 | ;--------------------------------------------------------------------
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96 | ALIGN JUMP_ALIGN
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97 | MenuScrollbars_MoveHighlightedItemByAX:
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98 | mov cx, [bp+MENUINIT.wHighlightedItem]
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99 | add cx, ax
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100 | call .RotateItemInCX
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101 | ; Fall to .ScrollPageForNewItemInCX
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102 |
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103 | ;--------------------------------------------------------------------
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104 | ; .ScrollPageForNewItemInCX
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105 | ; Parameters
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106 | ; CX: New item to be highlighted
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107 | ; SS:BP: Ptr to MENU
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108 | ; Returns:
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109 | ; Nothing
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110 | ; Corrupts registers:
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111 | ; AX, BX, CX, DX, SI, DI
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112 | ;--------------------------------------------------------------------
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113 | .ScrollPageForNewItemInCX:
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114 | call MenuScrollbars_IsItemInCXonVisiblePage
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115 | jc SHORT .HighlightNewItemOnCX
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116 |
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117 | mov dx, [bp+MENU.wFirstVisibleItem]
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118 | sub dx, [bp+MENUINIT.wHighlightedItem]
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119 | add dx, cx
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120 | MAX_S dx, 0
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121 | call .GetMaxFirstVisibleItemToAX
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122 | MIN_U ax, dx
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123 | mov [bp+MENU.wFirstVisibleItem], ax
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124 | call MenuText_RefreshAllItems
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125 |
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126 | ALIGN JUMP_ALIGN
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127 | .HighlightNewItemOnCX:
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128 | jmp MenuEvent_HighlightItemFromCX
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129 |
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130 | ;--------------------------------------------------------------------
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131 | ; .GetMaxFirstVisibleItemToAX
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132 | ; Parameters
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133 | ; SS:BP: Ptr to MENU
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134 | ; Returns:
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135 | ; AX: Max first visible item
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136 | ; Corrupts registers:
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137 | ; Nothing
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138 | ;--------------------------------------------------------------------
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139 | ALIGN JUMP_ALIGN
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140 | .GetMaxFirstVisibleItemToAX:
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141 | push cx
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142 |
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143 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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144 | mov ax, [bp+MENUINIT.wItems]
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145 | sub ax, cx
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146 |
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147 | pop cx
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148 | ret
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149 |
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150 | ;--------------------------------------------------------------------
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151 | ; .RotateItemInCX
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152 | ; Parameters
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153 | ; CX: Possibly under of overflown item to be rotated
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154 | ; SS:BP: Ptr to MENU
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155 | ; Returns:
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156 | ; CX: Valid item index
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157 | ; Corrupts registers:
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158 | ; DX
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159 | ;--------------------------------------------------------------------
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160 | ALIGN JUMP_ALIGN
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161 | .RotateItemInCX:
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162 | mov dx, [bp+MENUINIT.wItems]
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163 | cmp cx, BYTE 0
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164 | jl SHORT .RotateNegativeItemInCX
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165 | cmp cx, dx
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166 | jae SHORT .RotatePositiveItemInCX
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167 | ret
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168 |
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169 | ALIGN JUMP_ALIGN
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170 | .RotatePositiveItemInCX:
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171 | sub cx, dx
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172 | ;jae SHORT .RotatePositiveItemInCX ; Not needed by scrolling
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173 | ret
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174 |
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175 | ALIGN JUMP_ALIGN
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176 | .RotateNegativeItemInCX:
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177 | add cx, dx
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178 | ;js SHORT .RotateNegativeItemInCX ; Not needed by scrolling
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179 | ret
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180 |
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181 |
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182 | ;--------------------------------------------------------------------
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183 | ; MenuScrollbars_IsItemInCXonVisiblePage
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184 | ; Parameters
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185 | ; CX: Item whose visibility is to be checked
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186 | ; SS:BP: Ptr to MENU
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187 | ; Returns:
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188 | ; CF: Set if item is on visible page
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189 | ; Cleared if item is not on visible page
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190 | ; Corrupts registers:
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191 | ; AX
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192 | ;--------------------------------------------------------------------
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193 | ALIGN JUMP_ALIGN
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194 | MenuScrollbars_IsItemInCXonVisiblePage:
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195 | cmp cx, [bp+MENU.wFirstVisibleItem]
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196 | jb SHORT .ItemIsNotVisible
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197 |
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198 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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199 | cmp cx, ax
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200 | ja SHORT .ItemIsNotVisible
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201 | stc ; Item is visible
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202 | ret
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203 | ALIGN JUMP_ALIGN
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204 | .ItemIsNotVisible:
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205 | clc
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206 | ret
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207 |
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208 |
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209 | ;--------------------------------------------------------------------
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210 | ; MenuScrollbars_GetLastVisibleItemOnPageToAX
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211 | ; Parameters
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212 | ; SS:BP: Ptr to MENU
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213 | ; Returns:
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214 | ; AX: Index of last visible item on page
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215 | ; Corrupts registers:
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216 | ; Nothing
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217 | ;--------------------------------------------------------------------
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218 | ALIGN JUMP_ALIGN
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219 | MenuScrollbars_GetLastVisibleItemOnPageToAX:
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220 | push cx
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221 |
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222 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX
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223 | xchg ax, cx
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224 | dec ax
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225 | add ax, [bp+MENU.wFirstVisibleItem]
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226 |
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227 | pop cx
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228 | ret
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229 |
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230 |
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231 | ;--------------------------------------------------------------------
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232 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX
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233 | ; Parameters
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234 | ; SS:BP: Ptr to MENU
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235 | ; Returns:
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236 | ; CX: Currently visible items
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237 | ; Corrupts registers:
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238 | ; Nothing
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239 | ;--------------------------------------------------------------------
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240 | ALIGN JUMP_ALIGN
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241 | MenuScrollbars_GetActualVisibleItemsOnPageToCX:
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242 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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243 | MIN_U cx, [bp+MENUINIT.wItems]
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244 | ret
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245 |
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246 |
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247 | ;--------------------------------------------------------------------
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248 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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249 | ; Parameters
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250 | ; SS:BP: Ptr to MENU
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251 | ; Returns:
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252 | ; CX: Maximum number of visible items
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253 | ; Corrupts registers:
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254 | ; Nothing
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255 | ;--------------------------------------------------------------------
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256 | ALIGN JUMP_ALIGN
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257 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX:
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258 | eMOVZX cx, BYTE [bp+MENUINIT.bHeight]
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259 | sub cl, [bp+MENUINIT.bTitleLines]
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260 | sub cl, [bp+MENUINIT.bInfoLines]
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261 | sub cl, MENU_VERTICAL_BORDER_LINES
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262 | ret
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