puzzlewidget.h Example File

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  #ifndef PUZZLEWIDGET_H
  #define PUZZLEWIDGET_H

  #include <QList>
  #include <QPixmap>
  #include <QPoint>
  #include <QWidget>

  class QDragEnterEvent;
  class QDropEvent;
  class QMouseEvent;

  class PuzzleWidget : public QWidget
  {
      Q_OBJECT

  public:
      explicit PuzzleWidget(int imageSize, QWidget *parent = 0);
      void clear();

      int pieceSize() const;
      int imageSize() const;

  signals:
      void puzzleCompleted();

  protected:
      void dragEnterEvent(QDragEnterEvent *event) override;
      void dragLeaveEvent(QDragLeaveEvent *event) override;
      void dragMoveEvent(QDragMoveEvent *event) override;
      void dropEvent(QDropEvent *event) override;
      void mousePressEvent(QMouseEvent *event) override;
      void paintEvent(QPaintEvent *event) override;

  private:
      int findPiece(const QRect &pieceRect) const;
      const QRect targetSquare(const QPoint &position) const;

      QList<QPixmap> piecePixmaps;
      QList<QRect> pieceRects;
      QList<QPoint> pieceLocations;
      QRect highlightedRect;
      int inPlace;
      int m_ImageSize;
  };

  #endif // PUZZLEWIDGET_H