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Diffstat (limited to 'examples/draganddrop/draggableicons/dragwidget.cpp')
| -rw-r--r-- | examples/draganddrop/draggableicons/dragwidget.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/examples/draganddrop/draggableicons/dragwidget.cpp b/examples/draganddrop/draggableicons/dragwidget.cpp new file mode 100644 index 0000000..021f816 --- /dev/null +++ b/examples/draganddrop/draggableicons/dragwidget.cpp @@ -0,0 +1,169 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples 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 qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtGui> + +#include "dragwidget.h" + +//! [0] +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); +} +//! [0] + +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(); + } +} + +//! [1] +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()); +//! [1] + +//! [2] + QMimeData *mimeData = new QMimeData; + mimeData->setData("application/x-dnditemdata", itemData); +//! [2] + +//! [3] + QDrag *drag = new QDrag(this); + drag->setMimeData(mimeData); + drag->setPixmap(pixmap); + drag->setHotSpot(event->pos() - child->pos()); +//! [3] + + 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); + } +} |