3 * \file GuiFontMetrics.h
4 * This file is part of LyX, the document processor.
5 * Licence details can be found in the file COPYING.
7 * \author Abdelrazak Younes
9 * Full author contact details are available in file CREDITS.
12 #ifndef GUI_FONT_METRICS_H
13 #define GUI_FONT_METRICS_H
15 #include "frontends/FontMetrics.h"
17 #include "support/docstring.h"
22 #include <QFontMetrics>
24 #include <QTextLayout>
29 class GuiFontMetrics : public FontMetrics
32 GuiFontMetrics(QFont const & font);
34 virtual ~GuiFontMetrics() {}
36 virtual int maxAscent() const;
37 virtual int maxDescent() const;
38 virtual Dimension const defaultDimension() const;
39 virtual int em() const;
40 virtual int lineWidth() const;
41 virtual int underlinePos() const;
42 virtual int strikeoutPos() const;
43 virtual int width(char_type c) const;
44 virtual int ascent(char_type c) const;
45 virtual int descent(char_type c) const;
46 virtual int lbearing(char_type c) const;
47 virtual int rbearing(char_type c) const;
48 virtual int width(docstring const & s) const;
49 virtual int signedWidth(docstring const & s) const;
50 virtual int pos2x(docstring const & s, int pos, bool rtl, double ws) const;
51 virtual int x2pos(docstring const & s, int & x, bool rtl, double ws) const;
52 virtual bool breakAt(docstring & s, int & x, bool rtl, bool force) const;
53 virtual Dimension const dimension(char_type c) const;
55 virtual void rectText(docstring const & str,
59 virtual void buttonText(docstring const & str,
64 int countExpanders(docstring const & str) const;
66 int width(QString const & str) const;
71 getTextLayout(docstring const & s, QFont font,
72 bool const rtl, double const wordspacing) const;
77 /// Metrics on the font
78 QFontMetrics metrics_;
80 /// Cache of char widths
81 mutable QHash<char_type, int> width_cache_;
83 /// Cache of string widths
84 mutable QCache<QByteArray, int> strwidth_cache_;
86 struct AscendDescend {
90 /// Cache of char ascends and descends
91 mutable QHash<char_type, AscendDescend> metrics_cache_;
92 /// fill in \c metrics_cache_ at specified value.
93 AscendDescend const fillMetricsCache(char_type) const;
95 /// Cache of char right bearings
96 mutable QHash<char_type, int> rbearing_cache_;
98 // A trivial QTextLayout cache
99 mutable QTextLayout tl_cache_;
100 mutable docstring tl_cache_s_;
101 mutable QFont tl_cache_font_;
102 mutable bool tl_cache_rtl_;
103 mutable double tl_cache_wordspacing_;
107 } // namespace frontend
110 #endif // GUI_FONT_METRICS_H