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 Q_DECL_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) Q_DECL_OVERRIDE;
      void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
      void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;

  private:
      void calculateSquareSize();

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

  #endif