characterwidget.h

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#ifndef CHARACTERWIDGET_H
#define CHARACTERWIDGET_H

#include <QFont>
#include <QPoint>
#include <QSize>
#include <QString>
#include <QWidget>
#include "qgis_sip.h"
#include "qgis_gui.h"

class QMouseEvent;
class QPaintEvent;

class GUI_EXPORT CharacterWidget : public QWidget
{
    Q_OBJECT
    Q_PROPERTY( QChar character READ character WRITE setCharacter NOTIFY characterSelected )
    Q_PROPERTY( int columns READ columns WRITE setColumns )
    Q_PROPERTY( QFont font READ font WRITE setFont )

  public:

    CharacterWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr );

    QSize sizeHint() const override;

    int columns() const { return mColumns; }

    int squareSize() const { return mSquareSize; }

    QChar character() const { return QChar( mLastKey ); }

    QFont font() const { return mDisplayFont; }

  public slots:

    void setFont( const QFont &font );

    void setFontSize( double fontSize );

    void setFontStyle( const QString &fontStyle );

    void updateFontMerging( bool enable );

    void setColumns( int columns );

    void setCharacter( QChar character );

  signals:

    void characterSelected( QChar character );

  protected:
    void mouseMoveEvent( QMouseEvent *event ) override;
    void mousePressEvent( QMouseEvent *event ) override;
    void paintEvent( QPaintEvent *event ) override;

  private:
    QFont mDisplayFont;
    int mColumns = 16;
    int mLastKey = -1;
    int mSquareSize = 24;
};

#endif