Qt 4.0: puzzlewidget.h Example File (draganddrop/puzzle/puzzlewidget.h)

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# puzzlewidget.h Example File
draganddrop/puzzle/puzzlewidget.h

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
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    ** review the following information:
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        **
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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 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