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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+** * Redistributions of source code must retain the above copyright
+** notice, this list of conditions and the following disclaimer.
+** * Redistributions in binary form must reproduce the above copyright
+** notice, this list of conditions and the following disclaimer in
+** the documentation and/or other materials provided with the
+** distribution.
+** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
+** the names of its contributors may be used to endorse or promote
+** products derived from this software without specific prior written
+** permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtGui>
+
+#include "pieceslist.h"
+
+PiecesList::PiecesList(QWidget *parent)
+ : QListWidget(parent)
+{
+ setDragEnabled(true);
+ setViewMode(QListView::IconMode);
+ setIconSize(QSize(60, 60));
+ setSpacing(10);
+ setAcceptDrops(true);
+ setDropIndicatorShown(true);
+}
+
+void PiecesList::dragEnterEvent(QDragEnterEvent *event)
+{
+ if (event->mimeData()->hasFormat("image/x-puzzle-piece"))
+ event->accept();
+ else
+ event->ignore();
+}
+
+void PiecesList::dragMoveEvent(QDragMoveEvent *event)
+{
+ if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {
+ event->setDropAction(Qt::MoveAction);
+ event->accept();
+ } else
+ event->ignore();
+}
+
+void PiecesList::dropEvent(QDropEvent *event)
+{
+ if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {
+ QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");
+ QDataStream dataStream(&pieceData, QIODevice::ReadOnly);
+ QPixmap pixmap;
+ QPoint location;
+ dataStream >> pixmap >> location;
+
+ addPiece(pixmap, location);
+
+ event->setDropAction(Qt::MoveAction);
+ event->accept();
+ } else
+ event->ignore();
+}
+
+void PiecesList::addPiece(QPixmap pixmap, QPoint location)
+{
+ QListWidgetItem *pieceItem = new QListWidgetItem(this);
+ pieceItem->setIcon(QIcon(pixmap));
+ pieceItem->setData(Qt::UserRole, QVariant(pixmap));
+ pieceItem->setData(Qt::UserRole+1, location);
+ pieceItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable
+ | Qt::ItemIsDragEnabled);
+}
+
+void PiecesList::startDrag(Qt::DropActions /*supportedActions*/)
+{
+ QListWidgetItem *item = currentItem();
+
+ QByteArray itemData;
+ QDataStream dataStream(&itemData, QIODevice::WriteOnly);
+ QPixmap pixmap = qvariant_cast<QPixmap>(item->data(Qt::UserRole));
+ QPoint location = item->data(Qt::UserRole+1).toPoint();
+
+ dataStream << pixmap << location;
+
+ QMimeData *mimeData = new QMimeData;
+ mimeData->setData("image/x-puzzle-piece", itemData);
+
+ QDrag *drag = new QDrag(this);
+ drag->setMimeData(mimeData);
+ drag->setHotSpot(QPoint(pixmap.width()/2, pixmap.height()/2));
+ drag->setPixmap(pixmap);
+
+ if (drag->exec(Qt::MoveAction) == Qt::MoveAction)
+ delete takeItem(row(item));
+}