pieceslist.cpp Example Filedraganddrop/puzzle/pieceslist.cpp/**************************************************************************** ** ** 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(int pieceSize, QWidget *parent) : QListWidget(parent), m_PieceSize(pieceSize) { setDragEnabled(true); setViewMode(QListView::IconMode); setIconSize(QSize(m_PieceSize, m_PieceSize)); 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)); } |
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