1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

    32 **

    33 **

    34 **

    35 **

    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <QtGui>

    43 

    44 #include "puzzlewidget.h"

    45 

    46 PuzzleWidget::PuzzleWidget(QWidget *parent)

    47     : QWidget(parent)

    48 {

    49     setAcceptDrops(true);

    50     setMinimumSize(400, 400);

    51     setMaximumSize(400, 400);

    52 }

    53 

    54 void PuzzleWidget::clear()

    55 {

    56     pieceLocations.clear();

    57     piecePixmaps.clear();

    58     pieceRects.clear();

    59     highlightedRect = QRect();

    60     inPlace = 0;

    61     update();

    62 }

    63 

    64 void PuzzleWidget::dragEnterEvent(QDragEnterEvent *event)

    65 {

    66     if (event->mimeData()->hasFormat("image/x-puzzle-piece"))

    67         event->accept();

    68     else

    69         event->ignore();

    70 }

    71 

    72 void PuzzleWidget::dragLeaveEvent(QDragLeaveEvent *event)

    73 {

    74     QRect updateRect = highlightedRect;

    75     highlightedRect = QRect();

    76     update(updateRect);

    77     event->accept();

    78 }

    79 

    80 void PuzzleWidget::dragMoveEvent(QDragMoveEvent *event)

    81 {

    82     QRect updateRect = highlightedRect.unite(targetSquare(event->pos()));

    83 

    84     if (event->mimeData()->hasFormat("image/x-puzzle-piece")

    85         && findPiece(targetSquare(event->pos())) == -1) {

    86 

    87         highlightedRect = targetSquare(event->pos());

    88         event->setDropAction(Qt::MoveAction);

    89         event->accept();

    90     } else {

    91         highlightedRect = QRect();

    92         event->ignore();

    93     }

    94 

    95     update(updateRect);

    96 }

    97 

    98 void PuzzleWidget::dropEvent(QDropEvent *event)

    99 {

   100     if (event->mimeData()->hasFormat("image/x-puzzle-piece")

   101         && findPiece(targetSquare(event->pos())) == -1) {

   102 

   103         QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");

   104         QDataStream dataStream(&pieceData, QIODevice::ReadOnly);

   105         QRect square = targetSquare(event->pos());

   106         QPixmap pixmap;

   107         QPoint location;

   108         dataStream >> pixmap >> location;

   109 

   110         pieceLocations.append(location);

   111         piecePixmaps.append(pixmap);

   112         pieceRects.append(square);

   113 

   114         highlightedRect = QRect();

   115         update(square);

   116 

   117         event->setDropAction(Qt::MoveAction);

   118         event->accept();

   119 

   120         if (location == QPoint(square.x()/80, square.y()/80)) {

   121             inPlace++;

   122             if (inPlace == 25)

   123                 emit puzzleCompleted();

   124         }

   125     } else {

   126         highlightedRect = QRect();

   127         event->ignore();

   128     }

   129 }

   130 

   131 int PuzzleWidget::findPiece(const QRect &pieceRect) const

   132 {

   133     for (int i = 0; i < pieceRects.size(); ++i) {

   134         if (pieceRect == pieceRects[i]) {

   135             return i;

   136         }

   137     }

   138     return -1;

   139 }

   140 

   141 void PuzzleWidget::mousePressEvent(QMouseEvent *event)

   142 {

   143     QRect square = targetSquare(event->pos());

   144     int found = findPiece(square);

   145 

   146     if (found == -1)

   147         return;

   148 

   149     QPoint location = pieceLocations[found];

   150     QPixmap pixmap = piecePixmaps[found];

   151     pieceLocations.removeAt(found);

   152     piecePixmaps.removeAt(found);

   153     pieceRects.removeAt(found);

   154 

   155     if (location == QPoint(square.x()/80, square.y()/80))

   156         inPlace--;

   157 

   158     update(square);

   159 

   160     QByteArray itemData;

   161     QDataStream dataStream(&itemData, QIODevice::WriteOnly);

   162 

   163     dataStream << pixmap << location;

   164 

   165     QMimeData *mimeData = new QMimeData;

   166     mimeData->setData("image/x-puzzle-piece", itemData);

   167 

   168     QDrag *drag = new QDrag(this);

   169     drag->setMimeData(mimeData);

   170     drag->setHotSpot(event->pos() - square.topLeft());

   171     drag->setPixmap(pixmap);

   172 

   173     if (!(drag->exec(Qt::MoveAction) == Qt::MoveAction)) {

   174         pieceLocations.insert(found, location);

   175         piecePixmaps.insert(found, pixmap);

   176         pieceRects.insert(found, square);

   177         update(targetSquare(event->pos()));

   178 

   179         if (location == QPoint(square.x()/80, square.y()/80))

   180             inPlace++;

   181     }

   182 }

   183 

   184 void PuzzleWidget::paintEvent(QPaintEvent *event)

   185 {

   186     QPainter painter;

   187     painter.begin(this);

   188     painter.fillRect(event->rect(), Qt::white);

   189 

   190     if (highlightedRect.isValid()) {

   191         painter.setBrush(QColor("#ffcccc"));

   192         painter.setPen(Qt::NoPen);

   193         painter.drawRect(highlightedRect.adjusted(0, 0, -1, -1));

   194     }

   195 

   196     for (int i = 0; i < pieceRects.size(); ++i) {

   197         painter.drawPixmap(pieceRects[i], piecePixmaps[i]);

   198     }

   199     painter.end();

   200 }

   201 

   202 const QRect PuzzleWidget::targetSquare(const QPoint &position) const

   203 {

   204     return QRect(position.x()/80 * 80, position.y()/80 * 80, 80, 80);

   205 }