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     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the examples of the Qt Toolkit.

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    41 

    42 #include <QtGui>

    43 #include <QtSvg>

    44 #include "mimedata.h"

    45 #include "sourcewidget.h"

    46 

    47 SourceWidget::SourceWidget(QWidget *parent)

    48     : QWidget(parent)

    49 {

    50     QFile imageFile(":/images/example.svg");

    51     imageFile.open(QIODevice::ReadOnly);

    52     imageData = imageFile.readAll();

    53     imageFile.close();

    54 

    55     QScrollArea *imageArea = new QScrollArea;

    56     imageLabel = new QSvgWidget;

    57     imageLabel->renderer()->load(imageData);

    58     imageArea->setWidget(imageLabel);

    59     //imageLabel->setMinimumSize(imageLabel->renderer()->viewBox().size());

    60 

    61     QLabel *instructTopLabel = new QLabel(tr("This is an SVG drawing:"));

    62     QLabel *instructBottomLabel = new QLabel(

    63         tr("Drag the icon to copy the drawing as a PNG file:"));

    64     QPushButton *dragIcon = new QPushButton(tr("Export"));

    65     dragIcon->setIcon(QIcon(":/images/drag.png"));

    66 

    67     connect(dragIcon, SIGNAL(pressed()), this, SLOT(startDrag()));

    68 

    69     QGridLayout *layout = new QGridLayout;

    70     layout->addWidget(instructTopLabel, 0, 0, 1, 2);

    71     layout->addWidget(imageArea, 1, 0, 2, 2);

    72     layout->addWidget(instructBottomLabel, 3, 0);

    73     layout->addWidget(dragIcon, 3, 1);

    74     setLayout(layout);

    75     setWindowTitle(tr("Delayed Encoding"));

    76 }

    77 

    78 //![1]

    79 void SourceWidget::createData(const QString &mimeType)

    80 {

    81     if (mimeType != "image/png")

    82         return;

    83 

    84     QImage image(imageLabel->size(), QImage::Format_RGB32);

    85     QPainter painter;

    86     painter.begin(&image);

    87     imageLabel->renderer()->render(&painter);

    88     painter.end();

    89 

    90     QByteArray data;

    91     QBuffer buffer(&data);

    92     buffer.open(QIODevice::WriteOnly);

    93     image.save(&buffer, "PNG");

    94     buffer.close();

    95 

    96     mimeData->setData("image/png", data);

    97 }

    98 //![1]

    99 

   100 //![0]

   101 void SourceWidget::startDrag()

   102 {

   103     mimeData = new MimeData;

   104 

   105     connect(mimeData, SIGNAL(dataRequested(const QString &)),

   106             this, SLOT(createData(const QString &)), Qt::DirectConnection);

   107 

   108     QDrag *drag = new QDrag(this);

   109     drag->setMimeData(mimeData);

   110     drag->setPixmap(QPixmap(":/images/drag.png"));

   111 

   112     drag->exec(Qt::CopyAction);

   113 }

   114 //![0]

   115