/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the documentation of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** No Commercial Usage ** This file contains pre-release code and may not be distributed. ** You may use this file in accordance with the terms and conditions ** contained in the either Technology Preview License Agreement or the ** Beta Release License Agreement. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain ** additional rights. These rights are described in the Nokia Qt LGPL ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this ** package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you are unsure which license is appropriate for your use, please ** contact the sales department at http://qt.nokia.com/contact. ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include "dragwidget.h" DragWidget::DragWidget(QWidget *parent) : QFrame(parent) { setFrameStyle(QFrame::StyledPanel | QFrame::Sunken); dragDropLabel = new QLabel("", this); dragDropLabel->setAlignment(Qt::AlignHCenter); QHBoxLayout *layout = new QHBoxLayout(this); layout->addStretch(0); layout->addWidget(dragDropLabel); layout->addStretch(0); setAcceptDrops(true); } // Accept all actions, but deal with them separately later. //! [0] void DragWidget::dragEnterEvent(QDragEnterEvent *event) { event->acceptProposedAction(); } //! [0] //! [1] void DragWidget::dropEvent(QDropEvent *event) { if (event->source() == this && event->possibleActions() & Qt::MoveAction) return; //! [1] //! [2] if (event->proposedAction() == Qt::MoveAction) { event->acceptProposedAction(); // Process the data from the event. //! [2] emit dragResult(tr("The data was moved here.")); //! [3] } else if (event->proposedAction() == Qt::CopyAction) { event->acceptProposedAction(); // Process the data from the event. //! [3] emit dragResult(tr("The data was copied here.")); //! [4] } else { // Ignore the drop. return; } //! [4] // End of quote emit mimeTypes(event->mimeData()->formats()); setData(event->mimeData()->formats()[0], event->mimeData()->data(event->mimeData()->formats()[0])); //! [5] } //! [5] //! [6] void DragWidget::mousePressEvent(QMouseEvent *event) { if (event->button() == Qt::LeftButton) dragStartPosition = event->pos(); } //! [6] //! [7] void DragWidget::mouseMoveEvent(QMouseEvent *event) { if (!(event->buttons() & Qt::LeftButton)) return; if ((event->pos() - dragStartPosition).manhattanLength() < QApplication::startDragDistance()) return; QDrag *drag = new QDrag(this); QMimeData *mimeData = new QMimeData; mimeData->setData(mimeType, data); drag->setMimeData(mimeData); Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction); //! [7] switch (dropAction) { case Qt::CopyAction: emit dragResult(tr("The text was copied.")); break; case Qt::MoveAction: emit dragResult(tr("The text was moved.")); break; default: emit dragResult(tr("Unknown action.")); break; } //! [8] } //! [8] void DragWidget::setData(const QString &mimetype, const QByteArray &newData) { mimeType = mimetype; data = QByteArray(newData); dragDropLabel->setText(tr("%1 bytes").arg(data.size())); QStringList formats; formats << mimetype; emit mimeTypes(formats); }