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1 /* |
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2 * Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved. |
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3 * Copyright (C) 2010 François Sausset (sausset@gmail.com). All rights reserved. |
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4 * |
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5 * Redistribution and use in source and binary forms, with or without |
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6 * modification, are permitted provided that the following conditions |
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7 * are met: |
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8 * 1. Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * 2. Redistributions in binary form must reproduce the above copyright |
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11 * notice, this list of conditions and the following disclaimer in the |
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12 * documentation and/or other materials provided with the distribution. |
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13 * |
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14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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25 */ |
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26 |
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27 #include "config.h" |
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28 |
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29 #if ENABLE(MATHML) |
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30 |
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31 #include "RenderMathMLFraction.h" |
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32 |
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33 #include "GraphicsContext.h" |
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34 #include "MathMLNames.h" |
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35 #include "RenderText.h" |
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36 |
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37 namespace WebCore { |
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38 |
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39 using namespace MathMLNames; |
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40 |
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41 static const double gHorizontalPad = 0.2; |
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42 static const int gLineThin = 1; |
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43 static const int gLineMedium = 3; |
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44 static const int gLineThick = 5; |
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45 static const double gFractionAlignment = 0.25; |
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46 static const double gFractionBarWidth = 0.05; |
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47 static const double gDenominatorPad = 0.1; |
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48 |
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49 RenderMathMLFraction::RenderMathMLFraction(Element* fraction) |
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50 : RenderMathMLBlock(fraction) |
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51 , m_lineThickness(gLineThin) |
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52 { |
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53 setChildrenInline(false); |
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54 } |
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55 |
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56 void RenderMathMLFraction::updateFromElement() |
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57 { |
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58 // FIXME: mfrac where bevelled=true will need to reorganize the descendants |
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59 if (isEmpty()) |
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60 return; |
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61 |
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62 Element* fraction = static_cast<Element*>(node()); |
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63 |
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64 RenderObject* numerator = firstChild(); |
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65 String nalign = fraction->getAttribute(MathMLNames::numalignAttr); |
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66 if (equalIgnoringCase(nalign, "left")) |
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67 numerator->style()->setTextAlign(LEFT); |
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68 else if (equalIgnoringCase(nalign, "right")) |
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69 numerator->style()->setTextAlign(RIGHT); |
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70 else |
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71 numerator->style()->setTextAlign(CENTER); |
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72 |
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73 RenderObject* denominator = numerator->nextSibling(); |
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74 if (!denominator) |
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75 return; |
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76 |
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77 String dalign = fraction->getAttribute(MathMLNames::denomalignAttr); |
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78 if (equalIgnoringCase(dalign, "left")) |
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79 denominator->style()->setTextAlign(LEFT); |
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80 else if (equalIgnoringCase(dalign, "right")) |
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81 denominator->style()->setTextAlign(RIGHT); |
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82 else |
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83 denominator->style()->setTextAlign(CENTER); |
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84 |
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85 // FIXME: parse units |
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86 String thickness = fraction->getAttribute(MathMLNames::linethicknessAttr); |
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87 m_lineThickness = gLineThin; |
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88 if (equalIgnoringCase(thickness, "thin")) |
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89 m_lineThickness = gLineThin; |
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90 else if (equalIgnoringCase(thickness, "medium")) |
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91 m_lineThickness = gLineMedium; |
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92 else if (equalIgnoringCase(thickness, "thick")) |
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93 m_lineThickness = gLineThick; |
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94 else if (equalIgnoringCase(thickness, "0")) |
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95 m_lineThickness = 0; |
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96 |
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97 // Update the style for the padding of the denominator for the line thickness |
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98 lastChild()->style()->setPaddingTop(Length(static_cast<int>(m_lineThickness + style()->fontSize() * gDenominatorPad), Fixed)); |
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99 } |
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100 |
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101 void RenderMathMLFraction::addChild(RenderObject* child, RenderObject* beforeChild) |
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102 { |
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103 RenderBlock* row = new (renderArena()) RenderMathMLBlock(node()); |
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104 RefPtr<RenderStyle> rowStyle = makeBlockStyle(); |
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105 |
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106 rowStyle->setTextAlign(CENTER); |
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107 Length pad(static_cast<int>(rowStyle->fontSize() * gHorizontalPad), Fixed); |
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108 rowStyle->setPaddingLeft(pad); |
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109 rowStyle->setPaddingRight(pad); |
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110 |
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111 // Only add padding for rows as denominators |
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112 bool isNumerator = isEmpty(); |
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113 if (!isNumerator) |
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114 rowStyle->setPaddingTop(Length(2, Fixed)); |
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115 |
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116 row->setStyle(rowStyle.release()); |
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117 RenderBlock::addChild(row, beforeChild); |
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118 row->addChild(child); |
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119 updateFromElement(); |
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120 } |
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121 |
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122 void RenderMathMLFraction::layout() |
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123 { |
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124 updateFromElement(); |
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125 |
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126 // Adjust the fraction line thickness for the zoom |
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127 if (lastChild() && lastChild()->isRenderBlock()) |
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128 m_lineThickness = m_lineThickness * ceil(gFractionBarWidth * style()->fontSize()); |
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129 |
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130 RenderBlock::layout(); |
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131 |
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132 // The row layout can affect the numerator/denominator width. |
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133 // FIXME: This is probably only needed if one of the children |
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134 // contains an mrow. |
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135 setNeedsLayoutAndPrefWidthsRecalc(); |
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136 markContainingBlocksForLayout(); |
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137 |
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138 RenderBlock::layout(); |
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139 |
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140 } |
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141 |
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142 void RenderMathMLFraction::paint(PaintInfo& info, int tx, int ty) |
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143 { |
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144 RenderMathMLBlock::paint(info, tx, ty); |
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145 if (info.context->paintingDisabled() || info.phase != PaintPhaseForeground) |
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146 return; |
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147 |
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148 if (!firstChild() ||!m_lineThickness) |
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149 return; |
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150 |
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151 int verticalOffset = 0; |
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152 // The children are always RenderMathMLBlock instances |
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153 if (firstChild()->isRenderMathMLBlock()) { |
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154 int adjustForThickness = m_lineThickness > 1 ? m_lineThickness / 2 : 1; |
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155 if (m_lineThickness % 2 == 1) |
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156 adjustForThickness++; |
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157 RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild()); |
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158 if (numerator->isRenderMathMLRow()) |
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159 verticalOffset = numerator->offsetHeight() + adjustForThickness; |
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160 else |
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161 verticalOffset = numerator->offsetHeight(); |
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162 } |
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163 |
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164 tx += x(); |
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165 ty += y() + verticalOffset; |
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166 |
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167 info.context->save(); |
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168 |
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169 info.context->setStrokeThickness(static_cast<float>(m_lineThickness)); |
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170 info.context->setStrokeStyle(SolidStroke); |
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171 info.context->setStrokeColor(style()->visitedDependentColor(CSSPropertyColor), sRGBColorSpace); |
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172 |
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173 info.context->drawLine(IntPoint(tx, ty), IntPoint(tx + offsetWidth(), ty)); |
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174 |
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175 info.context->restore(); |
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176 } |
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177 |
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178 int RenderMathMLFraction::baselinePosition(bool firstLine, bool isRootLineBox) const |
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179 { |
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180 if (firstChild()->isRenderMathMLBlock()) { |
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181 RenderMathMLBlock* numerator = toRenderMathMLBlock(firstChild()); |
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182 // FIXME: the baseline should adjust so the fraction line aligns |
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183 // relative certain operators (e.g. aligns with the horizontal |
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184 // stroke of the plus). 1/3 of the current font size is just |
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185 // a good guess. |
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186 return numerator->offsetHeight() + style()->fontSize() / 3; |
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187 } |
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188 return RenderBlock::baselinePosition(firstLine, isRootLineBox); |
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189 } |
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190 |
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191 } |
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192 |
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193 |
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194 #endif // ENABLE(MATHML) |