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puzzlewidget.h Example File
^{draganddrop/puzzle/puzzlewidget.h}

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    ** This file is part of the documentation of the Qt Toolkit.
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    #ifndef PUZZLEWIDGET_H
    #define PUZZLEWIDGET_H

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

    class QDragEnterEvent;
    class QDropEvent;
    class QMouseEvent;

    class PuzzleWidget : public QWidget
    {
        Q_OBJECT

    public:
        PuzzleWidget(QWidget *parent = 0);
        void clear();

    signals:
        void puzzleCompleted();

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

    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;
    };

    #endif