lyx_mirror/src/frontends/qt4/GuiFontMetrics.h

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// -*- C++ -*-
/**
* \file GuiFontMetrics.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Abdelrazak Younes
*
* Full author contact details are available in file CREDITS.
*/
#ifndef GUI_FONT_METRICS_H
#define GUI_FONT_METRICS_H
#include "frontends/FontMetrics.h"
#include "support/docstring.h"
#include <QFontMetrics>
#include <QHash>
namespace lyx {
namespace frontend {
class GuiFontMetrics : public FontMetrics
{
public:
GuiFontMetrics(QFont const & font);
GuiFontMetrics(QFont const & font, QFont const & smallcaps_font);
virtual ~GuiFontMetrics() {}
virtual int maxAscent() const;
virtual int maxDescent() const;
virtual Dimension const defaultDimension() const;
virtual int width(char_type c) const;
virtual int ascent(char_type c) const;
virtual int descent(char_type c) const;
virtual int lbearing(char_type c) const;
virtual int rbearing(char_type c) const;
virtual int width(docstring const & s) const;
virtual int signedWidth(docstring const & s) const;
virtual Dimension const dimension(char_type c) const;
virtual void rectText(docstring const & str,
int & width,
int & ascent,
int & descent) const;
virtual void buttonText(docstring const & str,
int & width,
int & ascent,
int & descent) const;
///
int width(QString const & str) const;
private:
int smallcapsWidth(char_type c) const;
/// Metrics on the font
QFontMetrics metrics_;
QFontMetrics smallcaps_metrics_;
bool smallcaps_shape_;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
struct AscendDescend {
short int ascent;
short int descent;
};
/// Cache of char ascends and descends
mutable QHash<char_type, AscendDescend> metrics_cache_;
/// fill in \c metrics_cache_ at specified value.
AscendDescend const fillMetricsCache(char_type) const;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;
};
} // namespace frontend
} // namespace lyx
#endif // GUI_FONT_METRICS_H