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d723b90344
Replace FontMetrics::breakAt, which returned the next break point, with FontMetrics::breakString, which returns a vector of break points. To this end, an additional parameter gives the available width for next rows. Rename various variables and methods accordingly. Factor the code in breakString_helper to be more manageable. Adapt Row::Element::splitAt to return a bool on sucess and provide remaining row elements in a vector. The width noted above has been added as parameters. Rename the helper function splitFrom to moveElements and rewrite the code to be more efficient. Remove type of row element INVALID, which is not needed anymore. The code in TextMetrics::breakParagraph is now much simpler. In Row::finalize, remove the code that computed inconditionnally the current element size, and make sure that this width will be computed in all code paths of Row::Element::splitAt.
147 lines
3.6 KiB
C++
147 lines
3.6 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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struct BreakStringKey
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{
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bool operator==(BreakStringKey const & key) const {
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return key.s == s && key.first_wid == first_wid && key.wid == wid
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&& key.rtl == rtl && key.force == force;
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}
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docstring s;
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int first_wid;
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int wid;
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bool rtl;
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bool force;
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};
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struct TextLayoutKey
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{
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bool operator==(TextLayoutKey const & key) const {
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return key.s == s && key.rtl == rtl && key.ws == ws;
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}
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docstring s;
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bool rtl;
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double ws;
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};
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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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Breaks breakString(docstring const & s, int first_wid, int wid, 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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Breaks breakString_helper(docstring const & s, int first_wid, int wid,
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bool rtl, bool 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 breakString
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mutable Cache<BreakStringKey, Breaks> breakstr_cache_;
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/// Cache for QTextLayout
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mutable Cache<TextLayoutKey, 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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