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 "Changes.h"
  17 #include "ColorCode.h"
  18 #include "FontInfo.h"
  19
  20 #include "support/strfwd.h"
  21 #include "support/types.h"
  22
  23 #include <string>
  24
  25 class BufferView;
  26
  27 namespace lyx {
  28
  29 namespace frontend { class Painter; }
  30 class Inset;
  31 class MacroContext;
  32
  33
  34 /// Standard Sizes (mode styles)
  35 enum Styles {
  36         ///
  37         LM_ST_DISPLAY = 0,
  38         ///
  39         LM_ST_TEXT,
  40         ///
  41         LM_ST_SCRIPT,
  42         ///
  43         LM_ST_SCRIPTSCRIPT
  44 };
  45
  46
  47 //
  48 // This is the part common to MetricsInfo and PainterInfo
  49 //
  50 class MetricsBase {
  51 public:
  52         ///
  53         MetricsBase();
  54         ///
  55         MetricsBase(BufferView * bv, FontInfo const & font, int textwidth);
  56
  57         /// the current view
  58         BufferView * bv;
  59         /// current font
  60         FontInfo font;
  61         /// current math style (display/text/script/..)
  62         Styles style;
  63         /// name of current font - mathed specific
  64         std::string fontname;
  65         /// This is the width available in pixels
  66         int textwidth;
  67 };
  68
  69
  70 //
  71 // This contains a MetricsBase and information that's only relevant during
  72 // the first phase of the two-phase draw
  73 //
  74 class MetricsInfo {
  75 public:
  76         ///
  77         MetricsInfo();
  78         ///
  79         MetricsInfo(BufferView * bv, FontInfo const & font, int textwidth, MacroContext const & mc);
  80
  81         ///
  82         MetricsBase base;
  83         /// The context to resolve macros
  84         MacroContext const & macrocontext;
  85 };
  86
  87
  88 //
  89 // This contains a MetricsBase and information that's only relevant during
  90 // the second phase of the two-phase draw
  91 //
  92 class PainterInfo {
  93 public:
  94         ///
  95         PainterInfo(BufferView * bv, frontend::Painter & pain);
  96         ///
  97         void draw(int x, int y, char_type c);
  98         ///
  99         void draw(int x, int y, docstring const & str);
 100         /// Determines the background color for the specified inset based on the
 101         /// selection state, the background color inherited from the parent inset
 102         /// and the inset's own background color.
 103         /// \param sel whether to take the selection state into account
 104         ColorCode backgroundColor(Inset const * inset, bool sel = true) const;
 105
 106         ///
 107         MetricsBase base;
 108         ///
 109         frontend::Painter & pain;
 110         /// Whether the text at this point is right-to-left (for InsetNewline)
 111         bool ltr_pos;
 112         /// The change the parent is part of (change tracking)
 113         Change change_;
 114         /// Whether the parent is selected as a whole
 115         bool selected;
 116         ///
 117         bool full_repaint;
 118         /// Current background color
 119         ColorCode background_color;
 120 };
 121
 122 class TextMetricsInfo {};
 123
 124
 125 /// Generic base for temporarily changing things.
 126 /// The original state gets restored when the Changer is destructed.
 127 template <class Struct, class Temp = Struct>
 128 class Changer {
 129 public:
 130         ///
 131         Changer(Struct & orig) : orig_(orig) {}
 132 protected:
 133         ///
 134         Struct & orig_;
 135         ///
 136         Temp save_;
 137 };
 138
 139
 140
 141 // temporarily change some aspect of a font
 142 class FontChanger : public Changer<FontInfo> {
 143 public:
 144         ///
 145         FontChanger(FontInfo & orig, docstring const & font);
 146         FontChanger(MetricsBase & mb, char const * const font);
 147         ///
 148         ~FontChanger();
 149 };
 150
 151
 152 // temporarily change a full font
 153 class FontSetChanger : public Changer<MetricsBase> {
 154 public:
 155         ///
 156         FontSetChanger(MetricsBase & mb, docstring const & font);
 157         FontSetChanger(MetricsBase & mb, char const * const font);
 158         ///
 159         ~FontSetChanger();
 160 };
 161
 162
 163 // temporarily change the style
 164 class StyleChanger : public Changer<MetricsBase> {
 165 public:
 166         ///
 167         StyleChanger(MetricsBase & mb, Styles style);
 168         ///
 169         ~StyleChanger();
 170 };
 171
 172
 173 // temporarily change the style to script style
 174 class ScriptChanger : public StyleChanger {
 175 public:
 176         ///
 177         ScriptChanger(MetricsBase & mb);
 178 };
 179
 180
 181 // temporarily change the style suitable for use in fractions
 182 class FracChanger : public StyleChanger {
 183 public:
 184         ///
 185         FracChanger(MetricsBase & mb);
 186 };
 187
 188
 189 // temporarily change the style suitable for use in tabulars and arrays
 190 class ArrayChanger : public StyleChanger {
 191 public:
 192         ///
 193         ArrayChanger(MetricsBase & mb);
 194 };
 195
 196
 197
 198 // temporarily change the shape of a font
 199 class ShapeChanger : public Changer<FontInfo, FontShape> {
 200 public:
 201         ///
 202         ShapeChanger(FontInfo & font, FontShape shape);
 203         ///
 204         ~ShapeChanger();
 205 };
 206
 207
 208 // temporarily change the available text width
 209 class WidthChanger : public Changer<MetricsBase>
 210 {
 211 public:
 212         ///
 213         WidthChanger(MetricsBase & mb, int width);
 214         ///
 215         ~WidthChanger();
 216 };
 217
 218
 219 // temporarily change the used color
 220 class ColorChanger : public Changer<FontInfo, std::string> {
 221 public:
 222         ///
 223         ColorChanger(FontInfo & font, std::string const & color);
 224         ///
 225         ~ColorChanger();
 226 };
 227
 228 } // namespace lyx
 229
 230 #endif