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#include <QtGui>

#include "draglabel.h"

#include "dragwidget.h"

//! [0]

DragWidget::DragWidget(QWidget *parent)

    : QWidget(parent)

{

    QFile dictionaryFile(":/dictionary/words.txt");

    dictionaryFile.open(QFile::ReadOnly);

    QTextStream inputStream(&dictionaryFile);

//! [0]

//! [1]

    int x = 5;

    int y = 5;

    while (!inputStream.atEnd()) {

        QString word;

        inputStream >> word;

        if (!word.isEmpty()) {

            DragLabel *wordLabel = new DragLabel(word, this);

            wordLabel->move(x, y);

            wordLabel->show();

            wordLabel->setAttribute(Qt::WA_DeleteOnClose);

            x += wordLabel->width() + 2;

            if (x >= 245) {

                x = 5;

                y += wordLabel->height() + 2;

            }

        }

    }

//! [1]

//! [2]

    #ifndef Q_WS_S60

    //Fridge magnets is used for demoing Qt on S60 and themed backgrounds look better than white

    QPalette newPalette = palette();

    newPalette.setColor(QPalette::Window, Qt::white);

    setPalette(newPalette);

    #endif

    setMinimumSize(400, qMax(200, y));

    setWindowTitle(tr("Fridge Magnets"));

//! [2] //! [3]

    setAcceptDrops(true);

}

//! [3]

//! [4]

void DragWidget::dragEnterEvent(QDragEnterEvent *event)

{

//! [4] //! [5]

    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {

        if (children().contains(event->source())) {

            event->setDropAction(Qt::MoveAction);

            event->accept();

        } else {

            event->acceptProposedAction();

//! [5] //! [6]

        }

//! [6] //! [7]

    } else if (event->mimeData()->hasText()) {

        event->acceptProposedAction();

    } else {

        event->ignore();

    }

}

//! [7]

//! [8]

void DragWidget::dragMoveEvent(QDragMoveEvent *event)

{

    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {

        if (children().contains(event->source())) {

            event->setDropAction(Qt::MoveAction);

            event->accept();

        } else {

            event->acceptProposedAction();

        }

    } else if (event->mimeData()->hasText()) {

        event->acceptProposedAction();

    } else {

        event->ignore();

    }

}

//! [8]

//! [9]

void DragWidget::dropEvent(QDropEvent *event)

{

    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {

        const QMimeData *mime = event->mimeData();

//! [9] //! [10]

        QByteArray itemData = mime->data("application/x-fridgemagnet");

        QDataStream dataStream(&itemData, QIODevice::ReadOnly);

        QString text;

        QPoint offset;

        dataStream >> text >> offset;

//! [10]

//! [11]

        DragLabel *newLabel = new DragLabel(text, this);

        newLabel->move(event->pos() - offset);

        newLabel->show();

        newLabel->setAttribute(Qt::WA_DeleteOnClose);

        if (event->source() == this) {

            event->setDropAction(Qt::MoveAction);

            event->accept();

        } else {

            event->acceptProposedAction();

        }

//! [11] //! [12]

    } else if (event->mimeData()->hasText()) {

        QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),

                             QString::SkipEmptyParts);

        QPoint position = event->pos();

        foreach (QString piece, pieces) {

            DragLabel *newLabel = new DragLabel(piece, this);

            newLabel->move(position);

            newLabel->show();

            newLabel->setAttribute(Qt::WA_DeleteOnClose);

            position += QPoint(newLabel->width(), 0);

        }

        event->acceptProposedAction();

    } else {

        event->ignore();

    }

}

//! [12]

//! [13]

void DragWidget::mousePressEvent(QMouseEvent *event)

{

//! [13]

//! [14]

    DragLabel *child = static_cast<DragLabel*>(childAt(event->pos()));

    if (!child)

        return;

    QPoint hotSpot = event->pos() - child->pos();

    QByteArray itemData;

    QDataStream dataStream(&itemData, QIODevice::WriteOnly);

    dataStream << child->labelText() << QPoint(hotSpot);

//! [14]

//! [15]

    QMimeData *mimeData = new QMimeData;

    mimeData->setData("application/x-fridgemagnet", itemData);

    mimeData->setText(child->labelText());

//! [15]

//! [16]

    QDrag *drag = new QDrag(this);

    drag->setMimeData(mimeData);

    drag->setPixmap(*child->pixmap());

    drag->setHotSpot(hotSpot);

    child->hide();

//! [16]

//! [17]

    if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)

        child->close();

    else

        child->show();

}

//! [17]