1 | ; File name : MenuScrollbars.asm
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2 | ; Project name : Assembly Library
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3 | ; Created date : 20.7.2010
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4 | ; Last update : 9.8.2010
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5 | ; Author : Tomi Tilli
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6 | ; Description : Functions for drawing scroll bars over menu borders.
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7 |
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8 | ; Section containing code
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9 | SECTION .text
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10 |
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11 | ;--------------------------------------------------------------------
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12 | ; MenuScrollbars_AreScrollbarsNeeded
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13 | ; Parameters
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14 | ; SS:BP: Ptr to MENU
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15 | ; Returns:
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16 | ; CF: Set if scroll bars are needed
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17 | ; Cleared if no scroll bars needed
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18 | ; Corrupts registers:
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19 | ; CX
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20 | ;--------------------------------------------------------------------
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21 | ALIGN JUMP_ALIGN
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22 | MenuScrollbars_AreScrollbarsNeeded:
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23 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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24 | cmp cx, [bp+MENUINIT.wItems] ; Set CF if max visible < total items
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25 | ret
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26 |
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27 |
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28 | ;--------------------------------------------------------------------
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29 | ; MenuScrollbars_GetScrollCharacterToALForLineInDI
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30 | ; Parameters
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31 | ; DI: Index of item line to draw
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32 | ; SS:BP: Ptr to MENU
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33 | ; Returns:
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34 | ; AL: Scroll track or thumb character
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35 | ; Corrupts registers:
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36 | ; AH, CX, DX
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37 | ;--------------------------------------------------------------------
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38 | ALIGN JUMP_ALIGN
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39 | MenuScrollbars_GetScrollCharacterToALForLineInDI:
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40 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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41 | call .GetFirstThumbLineToAX
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42 | cmp di, ax ; Before first thumb line?
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43 | jb SHORT .ReturnTrackCharacter
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44 | call .GetLastThumbLineToAX
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45 | cmp di, ax ; After last thumb line?
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46 | ja SHORT .ReturnTrackCharacter
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47 | mov al, SCROLL_THUMB_CHARACTER
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48 | ret
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49 | ALIGN JUMP_ALIGN
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50 | .ReturnTrackCharacter:
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51 | mov al, SCROLL_TRACK_CHARACTER
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52 | ret
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53 |
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54 | ;--------------------------------------------------------------------
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55 | ; .GetLastThumbLineToAX
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56 | ; Parameters
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57 | ; CX: Max visible items on page
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58 | ; SS:BP: Ptr to MENU
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59 | ; Returns:
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60 | ; AX: Item line for last thumb character
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61 | ; Corrupts registers:
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62 | ; CX, DX
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63 | ;--------------------------------------------------------------------
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64 | ALIGN JUMP_ALIGN
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65 | .GetLastThumbLineToAX:
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66 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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67 | jmp SHORT .CalculateFirstOrLastThumbLineToAX
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68 |
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69 | ;--------------------------------------------------------------------
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70 | ; .GetFirstThumbLineToAX
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71 | ; Parameters
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72 | ; CX: Max visible items on page
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73 | ; SS:BP: Ptr to MENU
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74 | ; Returns:
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75 | ; AX: Item line for first thumb character
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76 | ; Corrupts registers:
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77 | ; CX, DX
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78 | ;--------------------------------------------------------------------
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79 | ALIGN JUMP_ALIGN
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80 | .GetFirstThumbLineToAX:
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81 | mov ax, [bp+MENU.wFirstVisibleItem]
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82 | .CalculateFirstOrLastThumbLineToAX:
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83 | mul cx
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84 | div WORD [bp+MENUINIT.wItems]
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85 | ret ; (Visible items on page * First visible item on page) / total items
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86 |
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87 |
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88 | ;--------------------------------------------------------------------
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89 | ; MenuScrollbars_MoveHighlightedItemByAX
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90 | ; Parameters
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91 | ; AX: Signed offset to new item to be highlighted
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92 | ; SS:BP: Ptr to MENU
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93 | ; Returns:
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94 | ; Nothing
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95 | ; Corrupts registers:
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96 | ; AX, BX, CX, DX, SI, DI
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97 | ;--------------------------------------------------------------------
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98 | ALIGN JUMP_ALIGN
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99 | MenuScrollbars_MoveHighlightedItemByAX:
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100 | mov cx, [bp+MENU.wHighlightedItem]
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101 | add cx, ax
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102 | call .RotateItemInCX
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103 | ; Fall to .ScrollPageForNewItemInCX
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104 |
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105 | ;--------------------------------------------------------------------
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106 | ; .ScrollPageForNewItemInCX
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107 | ; Parameters
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108 | ; CX: New item to be highlighted
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109 | ; SS:BP: Ptr to MENU
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110 | ; Returns:
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111 | ; Nothing
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112 | ; Corrupts registers:
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113 | ; AX, BX, CX, DX, SI, DI
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114 | ;--------------------------------------------------------------------
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115 | .ScrollPageForNewItemInCX:
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116 | call MenuScrollbars_IsItemInCXonVisiblePage
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117 | jc SHORT .HighlightNewItemOnCX
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118 |
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119 | mov dx, [bp+MENU.wFirstVisibleItem]
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120 | sub dx, [bp+MENU.wHighlightedItem]
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121 | add dx, cx
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122 | MAX_S dx, 0
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123 | call .GetMaxFirstVisibleItemToAX
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124 | MIN_U ax, dx
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125 | mov [bp+MENU.wFirstVisibleItem], ax
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126 | call MenuText_RefreshAllItems
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127 |
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128 | ALIGN JUMP_ALIGN
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129 | .HighlightNewItemOnCX:
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130 | jmp MenuEvent_HighlightItemFromCX
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131 |
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132 | ;--------------------------------------------------------------------
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133 | ; .GetMaxFirstVisibleItemToAX
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134 | ; Parameters
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135 | ; SS:BP: Ptr to MENU
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136 | ; Returns:
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137 | ; AX: Max first visible item
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138 | ; Corrupts registers:
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139 | ; Nothing
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140 | ;--------------------------------------------------------------------
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141 | ALIGN JUMP_ALIGN
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142 | .GetMaxFirstVisibleItemToAX:
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143 | push cx
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144 |
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145 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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146 | mov ax, [bp+MENUINIT.wItems]
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147 | sub ax, cx
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148 |
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149 | pop cx
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150 | ret
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151 |
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152 | ;--------------------------------------------------------------------
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153 | ; .RotateItemInCX
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154 | ; Parameters
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155 | ; CX: Possibly under of overflown item to be rotated
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156 | ; SS:BP: Ptr to MENU
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157 | ; Returns:
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158 | ; CX: Valid item index
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159 | ; Corrupts registers:
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160 | ; DX
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161 | ;--------------------------------------------------------------------
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162 | ALIGN JUMP_ALIGN
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163 | .RotateItemInCX:
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164 | mov dx, [bp+MENUINIT.wItems]
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165 | cmp cx, BYTE 0
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166 | jl SHORT .RotateNegativeItemInCX
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167 | cmp cx, dx
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168 | jae SHORT .RotatePositiveItemInCX
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169 | ret
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170 |
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171 | ALIGN JUMP_ALIGN
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172 | .RotatePositiveItemInCX:
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173 | sub cx, dx
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174 | ;jae SHORT .RotatePositiveItemInCX ; Not needed by scrolling
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175 | ret
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176 |
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177 | ALIGN JUMP_ALIGN
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178 | .RotateNegativeItemInCX:
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179 | add cx, dx
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180 | ;js SHORT .RotateNegativeItemInCX ; Not needed by scrolling
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181 | ret
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182 |
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183 |
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184 | ;--------------------------------------------------------------------
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185 | ; .IsItemInCXonVisiblePage
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186 | ; Parameters
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187 | ; CX: Item whose visibility is to be checked
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188 | ; SS:BP: Ptr to MENU
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189 | ; Returns:
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190 | ; CF: Set if item is on visible page
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191 | ; Cleared if item is not on visible page
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192 | ; Corrupts registers:
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193 | ; AX
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194 | ;--------------------------------------------------------------------
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195 | ALIGN JUMP_ALIGN
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196 | MenuScrollbars_IsItemInCXonVisiblePage:
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197 | cmp cx, [bp+MENUINIT.wItems]
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198 | jae SHORT .ItemIsNotVisible
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199 |
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200 | cmp cx, [bp+MENU.wFirstVisibleItem]
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201 | jb SHORT .ItemIsNotVisible
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202 |
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203 | call MenuScrollbars_GetLastVisibleItemOnPageToAX
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204 | cmp cx, ax
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205 | ja SHORT .ItemIsNotVisible
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206 | stc ; Item is visible
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207 | ret
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208 | ALIGN JUMP_ALIGN
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209 | .ItemIsNotVisible:
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210 | clc
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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 | ; MenuLocation_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 JUMP_ALIGN
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224 | MenuScrollbars_GetLastVisibleItemOnPageToAX:
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225 | push cx
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226 |
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227 | call MenuScrollbars_GetActualVisibleItemsOnPageToCX
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228 | xchg ax, cx
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229 | dec ax
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230 | add ax, [bp+MENU.wFirstVisibleItem]
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231 |
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232 | pop cx
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233 | ret
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234 |
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235 |
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236 | ;--------------------------------------------------------------------
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237 | ; MenuScrollbars_GetActualVisibleItemsOnPageToCX
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238 | ; Parameters
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239 | ; SS:BP: Ptr to MENU
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240 | ; Returns:
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241 | ; CX: Currently visible items
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242 | ; Corrupts registers:
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243 | ; Nothing
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244 | ;--------------------------------------------------------------------
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245 | ALIGN JUMP_ALIGN
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246 | MenuScrollbars_GetActualVisibleItemsOnPageToCX:
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247 | call MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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248 | MIN_U cx, [bp+MENUINIT.wItems]
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249 | ret
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250 |
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251 |
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252 | ;--------------------------------------------------------------------
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253 | ; MenuScrollbars_GetMaxVisibleItemsOnPageToCX
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254 | ; Parameters
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255 | ; SS:BP: Ptr to MENU
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256 | ; Returns:
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257 | ; CX: Maximum number of visible items
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258 | ; Corrupts registers:
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259 | ; Nothing
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260 | ;--------------------------------------------------------------------
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261 | ALIGN JUMP_ALIGN
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262 | MenuScrollbars_GetMaxVisibleItemsOnPageToCX:
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263 | eMOVZX cx, BYTE [bp+MENUINIT.bHeight]
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264 | sub cl, [bp+MENUINIT.bTitleLines]
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265 | sub cl, [bp+MENUINIT.bInfoLines]
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266 | sub cl, MENU_VERTICAL_BORDER_LINES
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267 | ret
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