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Diffstat (limited to 'examples/draganddrop/delayedencoding/sourcewidget.cpp')
| -rw-r--r-- | examples/draganddrop/delayedencoding/sourcewidget.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/examples/draganddrop/delayedencoding/sourcewidget.cpp b/examples/draganddrop/delayedencoding/sourcewidget.cpp new file mode 100644 index 0000000..f5aed89 --- /dev/null +++ b/examples/draganddrop/delayedencoding/sourcewidget.cpp @@ -0,0 +1,115 @@ +/**************************************************************************** +** +** 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 <QtSvg> +#include "mimedata.h" +#include "sourcewidget.h" + +SourceWidget::SourceWidget(QWidget *parent) + : QWidget(parent) +{ + QFile imageFile(":/images/example.svg"); + imageFile.open(QIODevice::ReadOnly); + imageData = imageFile.readAll(); + imageFile.close(); + + QScrollArea *imageArea = new QScrollArea; + imageLabel = new QSvgWidget; + imageLabel->renderer()->load(imageData); + imageArea->setWidget(imageLabel); + //imageLabel->setMinimumSize(imageLabel->renderer()->viewBox().size()); + + QLabel *instructTopLabel = new QLabel(tr("This is an SVG drawing:")); + QLabel *instructBottomLabel = new QLabel( + tr("Drag the icon to copy the drawing as a PNG file:")); + QPushButton *dragIcon = new QPushButton(tr("Export")); + dragIcon->setIcon(QIcon(":/images/drag.png")); + + connect(dragIcon, SIGNAL(pressed()), this, SLOT(startDrag())); + + QGridLayout *layout = new QGridLayout; + layout->addWidget(instructTopLabel, 0, 0, 1, 2); + layout->addWidget(imageArea, 1, 0, 2, 2); + layout->addWidget(instructBottomLabel, 3, 0); + layout->addWidget(dragIcon, 3, 1); + setLayout(layout); + setWindowTitle(tr("Delayed Encoding")); +} + +//![1] +void SourceWidget::createData(const QString &mimeType) +{ + if (mimeType != "image/png") + return; + + QImage image(imageLabel->size(), QImage::Format_RGB32); + QPainter painter; + painter.begin(&image); + imageLabel->renderer()->render(&painter); + painter.end(); + + QByteArray data; + QBuffer buffer(&data); + buffer.open(QIODevice::WriteOnly); + image.save(&buffer, "PNG"); + buffer.close(); + + mimeData->setData("image/png", data); +} +//![1] + +//![0] +void SourceWidget::startDrag() +{ + mimeData = new MimeData; + + connect(mimeData, SIGNAL(dataRequested(const QString &)), + this, SLOT(createData(const QString &)), Qt::DirectConnection); + + QDrag *drag = new QDrag(this); + drag->setMimeData(mimeData); + drag->setPixmap(QPixmap(":/images/drag.png")); + + drag->exec(Qt::CopyAction); +} +//![0] + |