lyx_mirror/src/metricsinfo.h

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// -*- C++ -*-
/**
* \file metricsinfo.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Andr<EFBFBD> P<EFBFBD>nitz
*
* Full author contact details are available in file CREDITS.
*/
#ifndef METRICSINFO_H
#define METRICSINFO_H
#include "lyxfont.h"
#include <string>
class Painter;
class BufferView;
/// Standard Sizes (mode styles)
enum Styles {
///
LM_ST_DISPLAY = 0,
///
LM_ST_TEXT,
///
LM_ST_SCRIPT,
///
LM_ST_SCRIPTSCRIPT
};
//
// This is the part common to MetricsInfo and PainterInfo
//
struct MetricsBase {
///
MetricsBase();
///
MetricsBase(BufferView * bv, LyXFont const & font, int textwidth);
/// the current view
BufferView * bv;
/// current font
LyXFont font;
/// current math style (display/text/script/..)
Styles style;
/// name of current font - mathed specific
std::string fontname;
/// This is the width available in pixels
int textwidth;
};
//
// This contains a MetricsBase and information that's only relevant during
// the first phase of the two-phase draw
//
struct MetricsInfo {
///
MetricsInfo();
///
MetricsInfo(BufferView * bv, LyXFont const & font, int textwidth);
///
MetricsBase base;
};
//
// This contains a MetricsBase and information that's only relevant during
// the second phase of the two-phase draw
//
struct PainterInfo {
///
PainterInfo(BufferView * bv, Painter & pain);
///
void draw(int x, int y, char c);
///
MetricsBase base;
///
Painter & pain;
/// Whether the text at this point is right-to-left (for InsetNewline)
bool ltr_pos;
};
struct TextMetricsInfo {};
// Generic base for temporarily changing things.
// The original state gets restored when the Changer is destructed.
template <class Struct, class Temp = Struct>
struct Changer {
///
Changer(Struct & orig) : orig_(orig) {}
protected:
///
Struct & orig_;
///
Temp save_;
};
// temporarily change some aspect of a font
struct FontChanger : public Changer<LyXFont> {
///
FontChanger(LyXFont & orig, char const * font);
///
~FontChanger();
};
// temporarily change a full font
struct FontSetChanger : public Changer<MetricsBase> {
///
FontSetChanger(MetricsBase & mb, char const * font);
///
~FontSetChanger();
};
// temporarily change the style
struct StyleChanger : public Changer<MetricsBase> {
///
StyleChanger(MetricsBase & mb, Styles style);
///
~StyleChanger();
};
// temporarily change the style to script style
struct ScriptChanger : public StyleChanger {
///
ScriptChanger(MetricsBase & mb);
};
// temporarily change the style suitable for use in fractions
struct FracChanger : public StyleChanger {
///
FracChanger(MetricsBase & mb);
};
// temporarily change the style suitable for use in tabulars and arrays
struct ArrayChanger : public StyleChanger {
///
ArrayChanger(MetricsBase & mb);
};
// temporarily change the shape of a font
struct ShapeChanger : public Changer<LyXFont, LyXFont::FONT_SHAPE> {
///
ShapeChanger(LyXFont & font, LyXFont::FONT_SHAPE shape);
///
~ShapeChanger();
};
// temporarily change the available text width
struct WidthChanger : public Changer<MetricsBase>
{
///
WidthChanger(MetricsBase & mb, int width);
///
~WidthChanger();
};
// temporarily change the used color
struct ColorChanger : public Changer<LyXFont, std::string> {
///
ColorChanger(LyXFont & font, std::string const & color);
///
~ColorChanger();
};
#endif