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// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QtWidgets>
#include <QtSvg>
#include <QtSvgWidgets>
#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, &QPushButton::pressed, this, &SourceWidget::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, &MimeData::dataRequested,
this, &SourceWidget::createData, Qt::DirectConnection);
QDrag *drag = new QDrag(this);
drag->setMimeData(mimeData);
drag->setPixmap(QPixmap(":/images/drag.png"));
drag->exec(Qt::CopyAction);
}
//![0]
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