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      1 /*
      2  * Copyright (C) 2010 Alex Milowski (alex (at) milowski.com). All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     14  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     15  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     16  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     17  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     19  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef RenderMathMLOperator_h
     27 #define RenderMathMLOperator_h
     28 
     29 #if ENABLE(MATHML)
     30 
     31 #include "RenderMathMLBlock.h"
     32 #include <wtf/unicode/CharacterNames.h>
     33 
     34 namespace WebCore {
     35 
     36 class RenderMathMLOperator : public RenderMathMLBlock {
     37 public:
     38     RenderMathMLOperator(Node* container);
     39     RenderMathMLOperator(Node* container, UChar operatorChar);
     40     virtual bool isRenderMathMLOperator() const { return true; }
     41     virtual void stretchToHeight(int pixelHeight);
     42     virtual void updateFromElement();
     43     virtual bool isChildAllowed(RenderObject*, RenderStyle*) const;
     44     virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const;
     45 
     46 protected:
     47     virtual void layout();
     48     virtual RefPtr<RenderStyle> createStackableStyle(int size, int topRelative);
     49     virtual RenderBlock* createGlyph(UChar glyph, int size = 0, int charRelative = 0, int topRelative = 0);
     50 
     51 private:
     52     int m_stretchHeight;
     53     bool m_isStacked;
     54     UChar m_operator;
     55 };
     56 
     57 inline RenderMathMLOperator* toRenderMathMLOperator(RenderMathMLBlock* block)
     58 {
     59     ASSERT(!block || block->isRenderMathMLOperator());
     60     return static_cast<RenderMathMLOperator*>(block);
     61 }
     62 
     63 inline const RenderMathMLOperator* toRenderMathMLOperator(const RenderMathMLBlock* block)
     64 {
     65     ASSERT(!block || block->isRenderMathMLOperator());
     66     return static_cast<const RenderMathMLOperator*>(block);
     67 }
     68 
     69 inline UChar convertHyphenMinusToMinusSign(UChar glyph)
     70 {
     71     // When rendered as a mathematical operator, minus glyph should be larger.
     72     if (glyph == hyphenMinus)
     73         return minusSign;
     74 
     75     return glyph;
     76 }
     77 
     78 }
     79 
     80 #endif // ENABLE(MATHML)
     81 #endif // RenderMathMLOperator_h
     82