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/*

finalwidget.cpp

A widget to display an image and a label containing a description.

*/

#include <QtGui>

#include "finalwidget.h"

FinalWidget::FinalWidget(QWidget *parent, const QString &name,

                         const QSize &labelSize)

    : QFrame(parent)

{

    hasImage = false;

    imageLabel = new QLabel;

    imageLabel->setFrameShadow(QFrame::Sunken);

    imageLabel->setFrameShape(QFrame::StyledPanel);

    imageLabel->setMinimumSize(labelSize);

    nameLabel = new QLabel(name);

    QVBoxLayout *layout = new QVBoxLayout;

    layout->addWidget(imageLabel, 1);

    layout->addWidget(nameLabel, 0);

    setLayout(layout);

}

/*!

    If the mouse moves far enough when the left mouse button is held down,

    start a drag and drop operation.

*/

void FinalWidget::mouseMoveEvent(QMouseEvent *event)

{

    if (!(event->buttons() & Qt::LeftButton))

        return;

    if ((event->pos() - dragStartPosition).manhattanLength()

         < QApplication::startDragDistance())

        return;

    if (!hasImage)

        return;

    QDrag *drag = new QDrag(this);

    QMimeData *mimeData = new QMimeData;

//! [0]

    QByteArray output;

    QBuffer outputBuffer(&output);

    outputBuffer.open(QIODevice::WriteOnly);

    imageLabel->pixmap()->toImage().save(&outputBuffer, "PNG");

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

//! [0]

/*

//! [1]

    mimeData->setImageData(QVariant(*imageLabel->pixmap()));

//! [1]

*/

    drag->setMimeData(mimeData);

    drag->setPixmap(imageLabel->pixmap()->scaled(64, 64, Qt::KeepAspectRatio));

//! [2]

    drag->setHotSpot(QPoint(drag->pixmap().width()/2,

                            drag->pixmap().height()));

//! [2]

    drag->start();

}

/*!

    Check for left mouse button presses in order to enable drag and drop.

*/

void FinalWidget::mousePressEvent(QMouseEvent *event)

{

    if (event->button() == Qt::LeftButton)

        dragStartPosition = event->pos();

}

const QPixmap* FinalWidget::pixmap() const

{

    return imageLabel->pixmap();

}

void FinalWidget::setPixmap(const QPixmap &pixmap)

{

    imageLabel->setPixmap(pixmap);

    hasImage = true;

}