characterwidget.h Example File

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#ifndef CHARACTERWIDGET_H
#define CHARACTERWIDGET_H

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

class QMouseEvent;
class QPaintEvent;

class CharacterWidget : public QWidget
{
    Q_OBJECT

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

public slots:
    void updateFont(const QFont &font);
    void updateSize(const QString &fontSize);
    void updateStyle(const QString &fontStyle);
    void updateFontMerging(bool enable);

signals:
    void characterSelected(const QString &character);

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

private:
    void calculateSquareSize();

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

#endif