qhexrenderer.h

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#ifndef QHEXRENDERER_H
#define QHEXRENDERER_H
 
/*
 * Nibble encoding:
 *           AB -> [A][B]
 * Nibble Index:    1  0
 */
 
#include <QTextDocument>
#include <QPainter>
#include "qhexdocument.h"
 
class QHexRenderer : public QObject
{
    Q_OBJECT
 
    public:
        enum { HeaderArea, AddressArea, HexArea, AsciiArea, ExtraArea };
 
    public:
        explicit QHexRenderer(QHexDocument* document, const QFontMetricsF& fontmetrics, QObject *parent = nullptr);
        void renderFrame(QPainter* painter);
        void render(QPainter* painter, quint64 start, quint64 end, quint64 firstline);  // begin included, end excluded
        void updateMetrics(const QFontMetricsF& fm);
        void enableCursor(bool b = true);
        void selectArea(const QPoint& pt);
 
    public:
        void blinkCursor();
        bool hitTest(const QPoint& pt, QHexPosition* position, quint64 firstline) const;
        int hitTestArea(const QPoint& pt) const;
        int selectedArea() const;
        bool editableArea(int area) const;
        quint64 documentLastLine() const;
        int documentLastColumn() const;
        quint64 documentLines() const;
        int documentWidth() const;
        int lineHeight() const;
        QRect getLineRect(quint64 line, quint64 firstline) const;
        int headerLineCount() const;
        int borderSize() const;
        int hexLineWidth() const;
 
    private:
        QString hexString(quint64 line, QByteArray *rawline = nullptr) const;
        QString asciiString(quint64 line, QByteArray *rawline = nullptr) const;
        QByteArray getLine(quint64 line) const;
        qint64 rendererLength() const;
        int getAddressWidth() const;
        int getHexColumnX() const;
        int getAsciiColumnX() const;
        int getEndColumnX() const;
        qreal getCellWidth() const;
        int getNCellsWidth(int n) const;
        void unprintableChars(QByteArray &ascii) const;
 
    private:
        enum Factor {Ascii = 1, Hex = 3};
 
        void applyDocumentStyles(QPainter* painter, QTextDocument *textdocument) const;
        void applyBasicStyle(QTextCursor& textcursor, const QByteArray& rawline, Factor factor) const;
        void applyMetadata(QTextCursor& textcursor, quint64 line, Factor factor) const;
        void applySelection(QTextCursor& textcursor, quint64 line, Factor factor) const;
        void applyCursorAscii(QTextCursor& textcursor, quint64 line) const;
        void applyCursorHex(QTextCursor& textcursor, quint64 line) const;
        void drawAddress(QPainter *painter, const QPalette &palette, const QRect &linerect, quint64 line);
        void drawHex(QPainter *painter, const QPalette &palette, const QRect &linerect, quint64 line);
        void drawAscii(QPainter *painter, const QPalette &palette, const QRect &linerect, quint64 line);
        void drawHeader(QPainter *painter, const QPalette &palette);
 
    private:
        QHexDocument* m_document;
        QFontMetricsF m_fontmetrics;
        int m_selectedarea;
        bool m_cursorenabled;
};
 
#endif // QHEXRENDERER_H