src/MetricsInfo.h

   1 // -*- C++ -*-
   2 /**
   3  * \file MetricsInfo.h
   4  * This file is part of LyX, the document processor.
   5  * Licence details can be found in the file COPYING.
   6  *
   7  * \author André Pönitz
   8  * \author Stefan Schimanski
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #ifndef METRICSINFO_H
  14 #define METRICSINFO_H
  15
  16 #include "ColorCode.h"
  17 #include "FontInfo.h"
  18
  19 #include "support/strfwd.h"
  20 #include "support/types.h"
  21
  22 #include <string>
  23
  24 class BufferView;
  25
  26 namespace lyx {
  27
  28 namespace frontend { class Painter; }
  29 class MacroContext;
  30
  31
  32 /// Standard Sizes (mode styles)
  33 enum Styles {
  34         ///
  35         LM_ST_DISPLAY = 0,
  36         ///
  37         LM_ST_TEXT,
  38         ///
  39         LM_ST_SCRIPT,
  40         ///
  41         LM_ST_SCRIPTSCRIPT
  42 };
  43
  44
  45 //
  46 // This is the part common to MetricsInfo and PainterInfo
  47 //
  48 class MetricsBase {
  49 public:
  50         ///
  51         MetricsBase();
  52         ///
  53         MetricsBase(BufferView * bv, FontInfo const & font, int textwidth);
  54
  55         /// the current view
  56         BufferView * bv;
  57         /// current font
  58         FontInfo font;
  59         /// current math style (display/text/script/..)
  60         Styles style;
  61         /// name of current font - mathed specific
  62         std::string fontname;
  63         /// This is the width available in pixels
  64         int textwidth;
  65 };
  66
  67
  68 //
  69 // This contains a MetricsBase and information that's only relevant during
  70 // the first phase of the two-phase draw
  71 //
  72 class MetricsInfo {
  73 public:
  74         ///
  75         MetricsInfo();
  76         ///
  77         MetricsInfo(BufferView * bv, FontInfo const & font, int textwidth, MacroContext const & mc);
  78
  79         ///
  80         MetricsBase base;
  81         /// The context to resolve macros
  82         MacroContext const & macrocontext;
  83 };
  84
  85
  86 //
  87 // This contains a MetricsBase and information that's only relevant during
  88 // the second phase of the two-phase draw
  89 //
  90 class PainterInfo {
  91 public:
  92         ///
  93         PainterInfo(BufferView * bv, frontend::Painter & pain);
  94         ///
  95         void draw(int x, int y, char_type c);
  96         ///
  97         void draw(int x, int y, docstring const & str);
  98
  99         ///
 100         MetricsBase base;
 101         ///
 102         frontend::Painter & pain;
 103         /// Whether the text at this point is right-to-left (for InsetNewline)
 104         bool ltr_pos;
 105         /// Whether the parent is deleted (change tracking)
 106         bool erased_;
 107         ///
 108         bool full_repaint;
 109         ///
 110         ColorCode background_color;
 111 };
 112
 113 class TextMetricsInfo {};
 114
 115
 116 /// Generic base for temporarily changing things.
 117 /// The original state gets restored when the Changer is destructed.
 118 template <class Struct, class Temp = Struct>
 119 class Changer {
 120 public:
 121         ///
 122         Changer(Struct & orig) : orig_(orig) {}
 123 protected:
 124         ///
 125         Struct & orig_;
 126         ///
 127         Temp save_;
 128 };
 129
 130
 131
 132 // temporarily change some aspect of a font
 133 class FontChanger : public Changer<FontInfo> {
 134 public:
 135         ///
 136         FontChanger(FontInfo & orig, docstring const & font);
 137         FontChanger(MetricsBase & mb, char const * const font);
 138         ///
 139         ~FontChanger();
 140 };
 141
 142
 143 // temporarily change a full font
 144 class FontSetChanger : public Changer<MetricsBase> {
 145 public:
 146         ///
 147         FontSetChanger(MetricsBase & mb, docstring const & font);
 148         FontSetChanger(MetricsBase & mb, char const * const font);
 149         ///
 150         ~FontSetChanger();
 151 };
 152
 153
 154 // temporarily change the style
 155 class StyleChanger : public Changer<MetricsBase> {
 156 public:
 157         ///
 158         StyleChanger(MetricsBase & mb, Styles style);
 159         ///
 160         ~StyleChanger();
 161 };
 162
 163
 164 // temporarily change the style to script style
 165 class ScriptChanger : public StyleChanger {
 166 public:
 167         ///
 168         ScriptChanger(MetricsBase & mb);
 169 };
 170
 171
 172 // temporarily change the style suitable for use in fractions
 173 class FracChanger : public StyleChanger {
 174 public:
 175         ///
 176         FracChanger(MetricsBase & mb);
 177 };
 178
 179
 180 // temporarily change the style suitable for use in tabulars and arrays
 181 class ArrayChanger : public StyleChanger {
 182 public:
 183         ///
 184         ArrayChanger(MetricsBase & mb);
 185 };
 186
 187
 188
 189 // temporarily change the shape of a font
 190 class ShapeChanger : public Changer<FontInfo, FontShape> {
 191 public:
 192         ///
 193         ShapeChanger(FontInfo & font, FontShape shape);
 194         ///
 195         ~ShapeChanger();
 196 };
 197
 198
 199 // temporarily change the available text width
 200 class WidthChanger : public Changer<MetricsBase>
 201 {
 202 public:
 203         ///
 204         WidthChanger(MetricsBase & mb, int width);
 205         ///
 206         ~WidthChanger();
 207 };
 208
 209
 210 // temporarily change the used color
 211 class ColorChanger : public Changer<FontInfo, std::string> {
 212 public:
 213         ///
 214         ColorChanger(FontInfo & font, std::string const & color);
 215         ///
 216         ~ColorChanger();
 217 };
 218
 219 } // namespace lyx
 220
 221 #endif