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121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
// -*- C++ -*-
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/**
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* \file GuiFontMetrics.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 GUI_FONT_METRICS_H
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#define GUI_FONT_METRICS_H
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#include "frontends/FontMetrics.h"
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#include "support/Cache.h"
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#include "support/docstring.h"
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#include <QFont>
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#include <QFontMetrics>
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#include <QHash>
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#include <QTextLayout>
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#include <memory>
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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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virtual ~GuiFontMetrics() {}
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int maxAscent() const override;
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int maxDescent() const override;
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Dimension const defaultDimension() const override;
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int em() const override;
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int xHeight() const override;
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int lineWidth() const override;
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int underlinePos() const override;
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int strikeoutPos() const override;
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bool italic() const override;
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double italicSlope() const override;
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int width(char_type c) const override;
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int ascent(char_type c) const override;
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int descent(char_type c) const override;
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int lbearing(char_type c) const override;
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int rbearing(char_type c) const override;
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int width(docstring const & s) const override;
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int signedWidth(docstring const & s) const override;
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int pos2x(docstring const & s, int pos, bool rtl, double ws) const override;
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int x2pos(docstring const & s, int & x, bool rtl, double ws) const override;
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bool breakAt(docstring & s, int & x, bool rtl, bool force) const override;
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Dimension const dimension(char_type c) const override;
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void rectText(docstring const & str,
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int & width,
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int & ascent,
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int & descent) const override;
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void buttonText(docstring const & str,
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const int offset,
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int & width,
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int & ascent,
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int & descent) const override;
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int countExpanders(docstring const & str) const override;
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///
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int width(QString const & str) const;
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/// Return a pointer to a cached QTextLayout object
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std::shared_ptr<QTextLayout const>
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getTextLayout(docstring const & s, bool const rtl,
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double const wordspacing) const;
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private:
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std::pair<int, int> breakAt_helper(docstring const & s, int const x,
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bool const rtl, bool const force) const;
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/// The font
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QFont font_;
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/// Metrics on the font
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QFontMetrics metrics_;
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/// Slope of italic font
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double slope_;
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/// Cache of char widths
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mutable QHash<char_type, int> width_cache_;
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/// Cache of string widths
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mutable Cache<docstring, int> strwidth_cache_;
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/// Cache for breakAt
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mutable Cache<docstring, std::pair<int, int>> breakat_cache_;
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/// Cache for QTextLayout
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mutable Cache<docstring, std::shared_ptr<QTextLayout>> qtextlayout_cache_;
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struct AscendDescend {
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int ascent;
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int descent;
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};
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/// Cache of char ascends and descends
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mutable QHash<char_type, AscendDescend> metrics_cache_;
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/// fill in \c metrics_cache_ at specified value.
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AscendDescend const fillMetricsCache(char_type) const;
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/// Cache of char left bearings
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mutable QHash<char_type, int> lbearing_cache_;
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/// Cache of char right bearings
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mutable QHash<char_type, int> rbearing_cache_;
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};
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} // namespace frontend
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} // namespace lyx
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#endif // GUI_FONT_METRICS_H
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