48e0c4df23
Change-Id: Ic804938fc352291d011800d21e549c10acac66fb Reviewed-by: Lars Knoll <lars.knoll@digia.com>
125 lines
4.3 KiB
C++
125 lines
4.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "pieceslist.h"
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#include <QDrag>
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#include <QDragEnterEvent>
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#include <QMimeData>
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PiecesList::PiecesList(int pieceSize, QWidget *parent)
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: QListWidget(parent), m_PieceSize(pieceSize)
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{
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setDragEnabled(true);
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setViewMode(QListView::IconMode);
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setIconSize(QSize(m_PieceSize, m_PieceSize));
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setSpacing(10);
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setAcceptDrops(true);
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setDropIndicatorShown(true);
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}
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void PiecesList::dragEnterEvent(QDragEnterEvent *event)
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{
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if (event->mimeData()->hasFormat("image/x-puzzle-piece"))
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event->accept();
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else
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event->ignore();
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}
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void PiecesList::dragMoveEvent(QDragMoveEvent *event)
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{
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if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->ignore();
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}
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}
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void PiecesList::dropEvent(QDropEvent *event)
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{
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if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {
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QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");
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QDataStream dataStream(&pieceData, QIODevice::ReadOnly);
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QPixmap pixmap;
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QPoint location;
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dataStream >> pixmap >> location;
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addPiece(pixmap, location);
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event->setDropAction(Qt::MoveAction);
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event->accept();
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} else {
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event->ignore();
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}
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}
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void PiecesList::addPiece(QPixmap pixmap, QPoint location)
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{
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QListWidgetItem *pieceItem = new QListWidgetItem(this);
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pieceItem->setIcon(QIcon(pixmap));
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pieceItem->setData(Qt::UserRole, QVariant(pixmap));
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pieceItem->setData(Qt::UserRole+1, location);
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pieceItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled);
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}
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void PiecesList::startDrag(Qt::DropActions /*supportedActions*/)
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{
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QListWidgetItem *item = currentItem();
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QByteArray itemData;
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QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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QPixmap pixmap = qvariant_cast<QPixmap>(item->data(Qt::UserRole));
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QPoint location = item->data(Qt::UserRole+1).toPoint();
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dataStream << pixmap << location;
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QMimeData *mimeData = new QMimeData;
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mimeData->setData("image/x-puzzle-piece", itemData);
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QDrag *drag = new QDrag(this);
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drag->setMimeData(mimeData);
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drag->setHotSpot(QPoint(pixmap.width()/2, pixmap.height()/2));
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drag->setPixmap(pixmap);
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if (drag->exec(Qt::MoveAction) == Qt::MoveAction)
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delete takeItem(row(item));
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}
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