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#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]