/**************************************************************************** ** ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved. ** ** This file is part of the example classes of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License versions 2.0 or 3.0 as published by the Free Software ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Alternatively you may (at ** your option) use any later version of the GNU General Public ** License if such license has been publicly approved by Trolltech ASA ** (or its successors, if any) and the KDE Free Qt Foundation. In ** addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.1, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** Please review the following information to ensure GNU General ** Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/. If ** you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech, as the sole ** copyright holder for Qt Designer, grants users of the Qt/Eclipse ** Integration plug-in the right for the Qt/Eclipse Integration to ** link to functionality provided by Qt Designer and its related ** libraries. ** ** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, ** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly ** granted herein. ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include <QtGui> #include "dragwidget.h" DragWidget::DragWidget(QWidget *parent) : QFrame(parent) { setMinimumSize(200, 200); setFrameStyle(QFrame::Sunken | QFrame::StyledPanel); setAcceptDrops(true); QLabel *boatIcon = new QLabel(this); boatIcon->setPixmap(QPixmap(":/images/boat.png")); boatIcon->move(20, 20); boatIcon->show(); boatIcon->setAttribute(Qt::WA_DeleteOnClose); QLabel *carIcon = new QLabel(this); carIcon->setPixmap(QPixmap(":/images/car.png")); carIcon->move(120, 20); carIcon->show(); carIcon->setAttribute(Qt::WA_DeleteOnClose); QLabel *houseIcon = new QLabel(this); houseIcon->setPixmap(QPixmap(":/images/house.png")); houseIcon->move(20, 120); houseIcon->show(); houseIcon->setAttribute(Qt::WA_DeleteOnClose); } void DragWidget::dragEnterEvent(QDragEnterEvent *event) { if (event->mimeData()->hasFormat("application/x-dnditemdata")) { if (event->source() == this) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else { event->ignore(); } } void DragWidget::dragMoveEvent(QDragMoveEvent *event) { if (event->mimeData()->hasFormat("application/x-dnditemdata")) { if (event->source() == this) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else { event->ignore(); } } void DragWidget::dropEvent(QDropEvent *event) { if (event->mimeData()->hasFormat("application/x-dnditemdata")) { QByteArray itemData = event->mimeData()->data("application/x-dnditemdata"); QDataStream dataStream(&itemData, QIODevice::ReadOnly); QPixmap pixmap; QPoint offset; dataStream >> pixmap >> offset; QLabel *newIcon = new QLabel(this); newIcon->setPixmap(pixmap); newIcon->move(event->pos() - offset); newIcon->show(); newIcon->setAttribute(Qt::WA_DeleteOnClose); if (event->source() == this) { event->setDropAction(Qt::MoveAction); event->accept(); } else { event->acceptProposedAction(); } } else { event->ignore(); } } void DragWidget::mousePressEvent(QMouseEvent *event) { QLabel *child = static_cast<QLabel*>(childAt(event->pos())); if (!child) return; QPixmap pixmap = *child->pixmap(); QByteArray itemData; QDataStream dataStream(&itemData, QIODevice::WriteOnly); dataStream << pixmap << QPoint(event->pos() - child->pos()); QMimeData *mimeData = new QMimeData; mimeData->setData("application/x-dnditemdata", itemData); QDrag *drag = new QDrag(this); drag->setMimeData(mimeData); drag->setPixmap(pixmap); drag->setHotSpot(event->pos() - child->pos()); QPixmap tempPixmap = pixmap; QPainter painter; painter.begin(&tempPixmap); painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127)); painter.end(); child->setPixmap(tempPixmap); if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction) child->close(); else { child->show(); child->setPixmap(pixmap); } }