lyx_mirror/src/MetricsInfo.h

251 lines
4.6 KiB
C
Raw Normal View History

// -*- 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
* \author Stefan Schimanski
*
* Full author contact details are available in file CREDITS.
*/
#ifndef METRICSINFO_H
#define METRICSINFO_H
#include "ColorCode.h"
#include "FontInfo.h"
#include "support/strfwd.h"
#include "support/types.h"
#include <string>
class BufferView;
namespace lyx {
namespace frontend { class Painter; }
class MacroContext;
/// 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
//
class MetricsBase {
public:
///
MetricsBase();
///
MetricsBase(BufferView * bv, FontInfo const & font, int textwidth);
/// the current view
BufferView * bv;
/// current font
FontInfo 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
//
class MetricsInfo {
public:
///
MetricsInfo();
///
MetricsInfo(BufferView * bv, FontInfo const & font, int textwidth, MacroContext const & mc);
///
MetricsBase base;
/// The context to resolve macros
MacroContext const & macrocontext;
};
//
// This contains a MetricsBase and information that's only relevant during
// the second phase of the two-phase draw
//
class PainterInfo {
public:
///
PainterInfo(BufferView * bv, frontend::Painter & pain);
///
void draw(int x, int y, char_type c);
///
void draw(int x, int y, docstring const & str);
///
MetricsBase base;
///
frontend::Painter & pain;
/// Whether the text at this point is right-to-left (for InsetNewline)
bool ltr_pos;
/// Whether the parent is deleted (change tracking)
bool erased_;
///
bool full_repaint;
///
ColorCode background_color;
};
class TextMetricsInfo {};
enum ScreenUpdateStrategy {
NoScreenUpdate,
SingleParUpdate,
FullScreenUpdate,
DecorationUpdate
};
class ViewMetricsInfo
{
public:
ViewMetricsInfo()
: p1(0), p2(0), y1(0), y2(0),
update_strategy(FullScreenUpdate), size(0)
{}
ViewMetricsInfo(pit_type p1, pit_type p2, int y1, int y2,
ScreenUpdateStrategy updatestrategy, pit_type size)
: p1(p1), p2(p2), y1(y1), y2(y2),
update_strategy(updatestrategy), size(size)
{}
pit_type p1;
pit_type p2;
int y1;
int y2;
ScreenUpdateStrategy update_strategy;
pit_type size;
};
// Generic base for temporarily changing things.
// The original state gets restored when the Changer is destructed.
template <class Struct, class Temp = Struct>
class Changer {
public:
///
Changer(Struct & orig) : orig_(orig) {}
protected:
///
Struct & orig_;
///
Temp save_;
};
// temporarily change some aspect of a font
class FontChanger : public Changer<FontInfo> {
public:
///
FontChanger(FontInfo & orig, docstring const & font);
FontChanger(MetricsBase & mb, char const * const font);
///
~FontChanger();
};
// temporarily change a full font
class FontSetChanger : public Changer<MetricsBase> {
public:
///
FontSetChanger(MetricsBase & mb, docstring const & font);
FontSetChanger(MetricsBase & mb, char const * const font);
///
~FontSetChanger();
};
// temporarily change the style
class StyleChanger : public Changer<MetricsBase> {
public:
///
StyleChanger(MetricsBase & mb, Styles style);
///
~StyleChanger();
};
// temporarily change the style to script style
class ScriptChanger : public StyleChanger {
public:
///
ScriptChanger(MetricsBase & mb);
};
// temporarily change the style suitable for use in fractions
class FracChanger : public StyleChanger {
public:
///
FracChanger(MetricsBase & mb);
};
// temporarily change the style suitable for use in tabulars and arrays
class ArrayChanger : public StyleChanger {
public:
///
ArrayChanger(MetricsBase & mb);
};
// temporarily change the shape of a font
class ShapeChanger : public Changer<FontInfo, FontShape> {
public:
///
ShapeChanger(FontInfo & font, FontShape shape);
///
~ShapeChanger();
};
// temporarily change the available text width
class WidthChanger : public Changer<MetricsBase>
{
public:
///
WidthChanger(MetricsBase & mb, int width);
///
~WidthChanger();
};
// temporarily change the used color
class ColorChanger : public Changer<FontInfo, std::string> {
public:
///
ColorChanger(FontInfo & font, std::string const & color);
///
~ColorChanger();
};
} // namespace lyx
#endif