characterwidget.h

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#ifndef CHARACTERWIDGET_H
#define CHARACTERWIDGET_H

#include <QFont>
#include <QPoint>
#include <QSize>
#include <QString>
#include <QWidget>

QT_BEGIN_NAMESPACE
class QMouseEvent;
class QPaintEvent;
QT_END_NAMESPACE

class GUI_EXPORT CharacterWidget : public QWidget
{
    Q_OBJECT

  public:
    CharacterWidget( QWidget *parent = 0 );
    QSize sizeHint() const override;

    int getColumns() const { return columns; }
    int getSquareSize() const { return squareSize; }

  public slots:
    void updateFont( const QFont &font );
    void updateSize( double fontSize );
    void updateStyle( const QString &fontStyle );
    void updateFontMerging( bool enable );
    void updateColumns( int cols );
    void setCharacter( const QChar& character );

  signals:
    void characterSelected( const QChar &character );

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

  private:
    QFont displayFont;
    int columns;
    int lastKey;
    int squareSize;
};

#endif