src/mathed/InsetMathChar.cpp

   1 /**
   2  * \file InsetMathChar.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Alejandro Aguilar Sierra
   7  * \author André Pönitz
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "InsetMathChar.h"
  15
  16 #include "MathSupport.h"
  17 #include "MathStream.h"
  18 #include "MetricsInfo.h"
  19
  20 #include "Dimension.h"
  21 #include "Encoding.h"
  22 #include "LaTeXFeatures.h"
  23 #include "TextPainter.h"
  24
  25 #include "frontends/FontMetrics.h"
  26
  27 #include "support/debug.h"
  28 #include "support/lstrings.h"
  29 #include "support/textutils.h"
  30
  31
  32 namespace lyx {
  33
  34 extern bool has_math_fonts;
  35
  36
  37 static bool isBinaryOp(char_type c)
  38 {
  39         return support::contains("+-<>=/*", static_cast<char>(c));
  40 }
  41
  42
  43 static bool slanted(char_type c)
  44 {
  45         return isAlphaASCII(c) || Encodings::isMathAlpha(c);
  46 }
  47
  48
  49 InsetMathChar::InsetMathChar(char_type c)
  50         : char_(c), kerning_(0)
  51 {}
  52
  53
  54
  55 Inset * InsetMathChar::clone() const
  56 {
  57         return new InsetMathChar(*this);
  58 }
  59
  60
  61 void InsetMathChar::metrics(MetricsInfo & mi, Dimension & dim) const
  62 {
  63 #if 1
  64         if (char_ == '=' && has_math_fonts) {
  65                 FontSetChanger dummy(mi.base, "cmr");
  66                 dim = theFontMetrics(mi.base.font).dimension(char_);
  67         } else if ((char_ == '>' || char_ == '<') && has_math_fonts) {
  68                 FontSetChanger dummy(mi.base, "cmm");
  69                 dim = theFontMetrics(mi.base.font).dimension(char_);
  70         } else if (!slanted(char_) && mi.base.fontname == "mathnormal") {
  71                 ShapeChanger dummy(mi.base.font, UP_SHAPE);
  72                 dim = theFontMetrics(mi.base.font).dimension(char_);
  73         } else {
  74                 frontend::FontMetrics const & fm = theFontMetrics(mi.base.font);
  75                 dim = fm.dimension(char_);
  76                 kerning_ = fm.rbearing(char_) - dim.wid;
  77         }
  78         int const em = mathed_char_width(mi.base.font, 'M');
  79         if (isBinaryOp(char_))
  80                 dim.wid += static_cast<int>(0.5*em+0.5);
  81         else if (char_ == '\'')
  82                 dim.wid += static_cast<int>(0.1667*em+0.5);
  83 #else
  84         whichFont(font_, code_, mi);
  85         dim = theFontMetrics(font_).dimension(char_);
  86         if (isBinaryOp(char_, code_))
  87                 dim.wid += 2 * theFontMetrics(font_).width(' ');
  88         lyxerr << "InsetMathChar::metrics: " << dim << endl;
  89 #endif
  90 }
  91
  92
  93 void InsetMathChar::draw(PainterInfo & pi, int x, int y) const
  94 {
  95         //lyxerr << "drawing '" << char_ << "' font: " << pi.base.fontname << endl;
  96         int const em = mathed_char_width(pi.base.font, 'M');
  97         if (isBinaryOp(char_))
  98                 x += static_cast<int>(0.25*em+0.5);
  99         else if (char_ == '\'')
 100                 x += static_cast<int>(0.0833*em+0.5);
 101 #if 1
 102         if (char_ == '=' && has_math_fonts) {
 103                 FontSetChanger dummy(pi.base, "cmr");
 104                 pi.draw(x, y, char_);
 105         } else if ((char_ == '>' || char_ == '<') && has_math_fonts) {
 106                 FontSetChanger dummy(pi.base, "cmm");
 107                 pi.draw(x, y, char_);
 108         } else if (!slanted(char_) && pi.base.fontname == "mathnormal") {
 109                 ShapeChanger dummy(pi.base.font, UP_SHAPE);
 110                 pi.draw(x, y, char_);
 111         } else {
 112                 pi.draw(x, y, char_);
 113         }
 114 #else
 115         drawChar(pain, font_, x, y, char_);
 116 #endif
 117 }
 118
 119
 120 void InsetMathChar::metricsT(TextMetricsInfo const &, Dimension & dim) const
 121 {
 122         dim.wid = 1;
 123         dim.asc = 1;
 124         dim.des = 0;
 125 }
 126
 127
 128 void InsetMathChar::drawT(TextPainter & pain, int x, int y) const
 129 {
 130         //lyxerr << "drawing text '" << char_ << "' code: " << code_ << endl;
 131         pain.draw(x, y, char_);
 132 }
 133
 134
 135 void InsetMathChar::write(WriteStream & os) const
 136 {
 137         os.os().put(char_);
 138 }
 139
 140
 141 void InsetMathChar::validate(LaTeXFeatures & features) const
 142 {
 143         if (char_ >= 0x80)
 144                 encodings.validate(char_, features, true);
 145 }
 146
 147
 148 void InsetMathChar::normalize(NormalStream & os) const
 149 {
 150         os << "[char ";
 151         os.os().put(char_);
 152         os << " mathalpha]";
 153 }
 154
 155
 156 void InsetMathChar::octave(OctaveStream & os) const
 157 {
 158         os.os().put(char_);
 159 }
 160
 161
 162 void InsetMathChar::mathmlize(MathStream & ms) const
 163 {
 164         switch (char_) {
 165                 case '<': ms << "&lt;"; break;
 166                 case '>': ms << "&gt;"; break;
 167                 case '&': ms << "&amp;"; break;
 168                 default: ms.os().put(char_); break;
 169         }
 170 }
 171
 172
 173 bool InsetMathChar::isRelOp() const
 174 {
 175         return char_ == '=' || char_ == '<' || char_ == '>';
 176 }
 177
 178
 179 } // namespace lyx