#include "frontends/FontMetrics.h"
+#include "support/Cache.h"
#include "support/docstring.h"
+#include <QFont>
#include <QFontMetrics>
#include <QHash>
+#include <QTextLayout>
+
+#include <memory>
namespace lyx {
namespace frontend {
virtual int maxAscent() const;
virtual int maxDescent() const;
virtual Dimension const defaultDimension() const;
+ virtual int em() const;
+ virtual int lineWidth() const;
+ virtual int underlinePos() const;
+ virtual int strikeoutPos() const;
virtual int width(char_type c) const;
virtual int ascent(char_type c) const;
virtual int descent(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 int pos2x(docstring const & s, int pos, bool rtl, double ws) const;
+ virtual int x2pos(docstring const & s, int & x, bool rtl, double ws) const;
+ virtual bool breakAt(docstring & s, int & x, bool rtl, bool force) const;
virtual Dimension const dimension(char_type c) const;
virtual void rectText(docstring const & str,
int & width,
int & ascent,
int & descent) const;
+
+ int countExpanders(docstring const & str) const;
///
int width(QString const & str) const;
+ /// Return a pointer to a cached QTextLayout object
+ std::shared_ptr<QTextLayout const>
+ getTextLayout(docstring const & s, bool const rtl,
+ double const wordspacing) const;
+
private:
+
+ std::pair<int, int> breakAt_helper(docstring const & s, int const x,
+ bool const rtl, bool const force) const;
+
+ /// The font
+ QFont font_;
+
/// Metrics on the font
QFontMetrics metrics_;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
+ /// Cache of string widths
+ mutable Cache<docstring, int> strwidth_cache_;
+ /// Cache for breakAt
+ mutable Cache<docstring, std::pair<int, int>> breakat_cache_;
+ /// Cache for QTextLayout
+ mutable Cache<docstring, std::shared_ptr<QTextLayout>> qtextlayout_cache_;
struct AscendDescend {
int ascent;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;
+
};
} // namespace frontend