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Viewing changes to examples/draganddrop/puzzle/pieceslist.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Adam Conrad
  • Date: 2005-08-24 04:09:09 UTC
  • Revision ID: james.westby@ubuntu.com-20050824040909-xmxe9jfr4a0w5671
Tags: upstream-4.0.0
Import upstream version 4.0.0

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examples/draganddrop/puzzle/pieceslist.cpp
 
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/****************************************************************************
 
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**
 
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** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
 
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**
 
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** This file is part of the example classes of the Qt Toolkit.
 
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**
 
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** This file may be distributed under the terms of the Q Public License
 
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** as defined by Trolltech AS of Norway and appearing in the file
 
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** LICENSE.QPL included in the packaging of this file.
 
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**
 
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** This file may be distributed and/or modified under the terms of the
 
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** GNU General Public License version 2 as published by the Free Software
 
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** Foundation and appearing in the file LICENSE.GPL included in the
 
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** packaging of this file.
 
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**
 
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** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
 
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**   information about Qt Commercial License Agreements.
 
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** See http://www.trolltech.com/qpl/ for QPL licensing information.
 
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** See http://www.trolltech.com/gpl/ for GPL licensing information.
 
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**
 
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** Contact info@trolltech.com if any conditions of this licensing are
 
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** not clear to you.
 
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**
 
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 
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** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 
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**
 
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****************************************************************************/
 
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#include <QtGui>
 
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#include "pieceslist.h"
 
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PiecesList::PiecesList(QWidget *parent)
 
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    : QListWidget(parent)
 
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{
 
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    setDragEnabled(true);
 
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    setViewMode(QListView::IconMode);
 
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    setIconSize(QSize(60, 60));
 
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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::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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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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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
 
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                        | 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 = qVariantValue<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->start(Qt::MoveAction) == Qt::MoveAction)
 
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        delete takeItem(row(item));
 
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}