diff options
Diffstat (limited to 'examples/svg/draganddrop/delayedencoding/sourcewidget.cpp')
-rw-r--r-- | examples/svg/draganddrop/delayedencoding/sourcewidget.cpp | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/examples/svg/draganddrop/delayedencoding/sourcewidget.cpp b/examples/svg/draganddrop/delayedencoding/sourcewidget.cpp new file mode 100644 index 0000000..0373edb --- /dev/null +++ b/examples/svg/draganddrop/delayedencoding/sourcewidget.cpp @@ -0,0 +1,115 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** You may use this file under the terms of the BSD license as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names +** of its contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include <QtWidgets> +#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:")); + instructBottomLabel->setWordWrap(true); + 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(QString)), + this, SLOT(createData(QString)), Qt::DirectConnection); + + QDrag *drag = new QDrag(this); + drag->setMimeData(mimeData); + drag->setPixmap(QPixmap(":/images/drag.png")); + + drag->exec(Qt::CopyAction); +} +//![0] + |