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#include <QtGui>

#include "pieceslist.h"

PiecesList::PiecesList(QWidget *parent)

    : QListWidget(parent)

{

    setDragEnabled(true);

    setViewMode(QListView::IconMode);

    setIconSize(QSize(60, 60));

    setSpacing(10);

    setAcceptDrops(true);

    setDropIndicatorShown(true);

}

void PiecesList::dragEnterEvent(QDragEnterEvent *event)

{

    if (event->mimeData()->hasFormat("image/x-puzzle-piece"))

        event->accept();

    else

        event->ignore();

}

void PiecesList::dragMoveEvent(QDragMoveEvent *event)

{

    if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {

        event->setDropAction(Qt::MoveAction);

        event->accept();

    } else

        event->ignore();

}

void PiecesList::dropEvent(QDropEvent *event)

{

    if (event->mimeData()->hasFormat("image/x-puzzle-piece")) {

        QByteArray pieceData = event->mimeData()->data("image/x-puzzle-piece");

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

        QPixmap pixmap;

        QPoint location;

        dataStream >> pixmap >> location;

        addPiece(pixmap, location);

        event->setDropAction(Qt::MoveAction);

        event->accept();

    } else

        event->ignore();

}

void PiecesList::addPiece(QPixmap pixmap, QPoint location)

{

    QListWidgetItem *pieceItem = new QListWidgetItem(this);

    pieceItem->setIcon(QIcon(pixmap));

    pieceItem->setData(Qt::UserRole, QVariant(pixmap));

    pieceItem->setData(Qt::UserRole+1, location);

    pieceItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsSelectable

                        | Qt::ItemIsDragEnabled);

}

void PiecesList::startDrag(Qt::DropActions /*supportedActions*/)

{

    QListWidgetItem *item = currentItem();

    QByteArray itemData;

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

    QPixmap pixmap = qVariantValue<QPixmap>(item->data(Qt::UserRole));

    QPoint location = item->data(Qt::UserRole+1).toPoint();

    dataStream << pixmap << location;

    QMimeData *mimeData = new QMimeData;

    mimeData->setData("image/x-puzzle-piece", itemData);

    QDrag *drag = new QDrag(this);

    drag->setMimeData(mimeData);

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

    drag->setPixmap(pixmap);

    if (drag->exec(Qt::MoveAction) == Qt::MoveAction)

        delete takeItem(row(item));

}