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56be946751
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15588 a592a061-630c-0410-9148-cb99ea01b6c8
84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
// -*- C++ -*-
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/**
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* \file FontMetrics.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Abdelrazak Younes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef QT4_FONT_METRICS_H
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#define QT4_FONT_METRICS_H
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#include "frontends/FontMetrics.h"
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#include "support/docstring.h"
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#include <QFontMetrics>
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// Starting with version 3.1.0, Qt/X11 does its own caching of
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// character width, so it is not necessary to provide ours.
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#if defined(Q_WS_MACX) || defined(Q_WS_WIN32)
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#define USE_LYX_FONTCACHE
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#endif
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namespace lyx {
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namespace frontend {
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class GuiFontMetrics: public FontMetrics
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{
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public:
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GuiFontMetrics(QFont const & font);
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GuiFontMetrics(QFont const & font, QFont const & smallcaps_font);
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virtual ~GuiFontMetrics() {}
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virtual int maxAscent() const;
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virtual int maxDescent() const;
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virtual int ascent(lyx::char_type c) const;
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int descent(lyx::char_type c) const;
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virtual int lbearing(lyx::char_type c) const;
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virtual int rbearing(lyx::char_type c) const;
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virtual int width(lyx::char_type const * s, size_t n) const;
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virtual int signedWidth(lyx::docstring const & s) const;
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virtual void rectText(lyx::docstring const & str,
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int & width,
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int & ascent,
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int & descent) const;
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virtual void buttonText(lyx::docstring const & str,
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int & width,
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int & ascent,
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int & descent) const;
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///
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int width(QString const & str) const;
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private:
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int smallcapsWidth(QString const & s) const;
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/// Metrics on the font
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QFontMetrics metrics_;
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QFontMetrics smallcaps_metrics_;
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bool smallcaps_shape_;
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#ifndef USE_LYX_FONTCACHE
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/// Return pixel width for the given unicode char
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int width(unsigned short val) const { return metrics_.width(QChar(val)); }
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#else
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/// Return pixel width for the given unicode char
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int width(unsigned short val) const;
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/// Cache of char widths
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mutable int widthcache_[65536];
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#endif // USE_LYX_FONTCACHE
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};
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} // namespace frontend
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} // namespace lyx
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#endif // QT4_FONT_METRICS_H
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