/****************************************************************************
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 ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
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 ** additional rights. These rights are described in the Trolltech GPL
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 ** Trolltech ASA (c) 2007
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 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 ****************************************************************************/
 
 #include <QtGui>
 
 #include "dragwidget.h"
 
 DragWidget::DragWidget(QWidget *parent)
     : QFrame(parent)
 {
     setMinimumSize(200, 200);
     setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
     setAcceptDrops(true);
 
     QLabel *boatIcon = new QLabel(this);
     boatIcon->setPixmap(QPixmap(":/images/boat.png"));
     boatIcon->move(20, 20);
     boatIcon->show();
     boatIcon->setAttribute(Qt::WA_DeleteOnClose);
 
     QLabel *carIcon = new QLabel(this);
     carIcon->setPixmap(QPixmap(":/images/car.png"));
     carIcon->move(120, 20);
     carIcon->show();
     carIcon->setAttribute(Qt::WA_DeleteOnClose);
 
     QLabel *houseIcon = new QLabel(this);
     houseIcon->setPixmap(QPixmap(":/images/house.png"));
     houseIcon->move(20, 120);
     houseIcon->show();
     houseIcon->setAttribute(Qt::WA_DeleteOnClose);
 }
 
 void DragWidget::dragEnterEvent(QDragEnterEvent *event)
 {
     if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
         if (event->source() == this) {
             event->setDropAction(Qt::MoveAction);
             event->accept();
         } else {
             event->acceptProposedAction();
         }
     } else {
         event->ignore();
     }
 }
 
 void DragWidget::dragMoveEvent(QDragMoveEvent *event)
 {
     if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
         if (event->source() == this) {
             event->setDropAction(Qt::MoveAction);
             event->accept();
         } else {
             event->acceptProposedAction();
         }
     } else {
         event->ignore();
     }
 }
 
 void DragWidget::dropEvent(QDropEvent *event)
 {
     if (event->mimeData()->hasFormat("application/x-dnditemdata")) {
         QByteArray itemData = event->mimeData()->data("application/x-dnditemdata");
         QDataStream dataStream(&itemData, QIODevice::ReadOnly);
 
         QPixmap pixmap;
         QPoint offset;
         dataStream >> pixmap >> offset;
 
         QLabel *newIcon = new QLabel(this);
         newIcon->setPixmap(pixmap);
         newIcon->move(event->pos() - offset);
         newIcon->show();
         newIcon->setAttribute(Qt::WA_DeleteOnClose);
 
         if (event->source() == this) {
             event->setDropAction(Qt::MoveAction);
             event->accept();
         } else {
             event->acceptProposedAction();
         }
     } else {
         event->ignore();
     }
 }
 
 void DragWidget::mousePressEvent(QMouseEvent *event)
 {
     QLabel *child = static_cast<QLabel*>(childAt(event->pos()));
     if (!child)
         return;
 
     QPixmap pixmap = *child->pixmap();
 
     QByteArray itemData;
     QDataStream dataStream(&itemData, QIODevice::WriteOnly);
     dataStream << pixmap << QPoint(event->pos() - child->pos());
 
     QMimeData *mimeData = new QMimeData;
     mimeData->setData("application/x-dnditemdata", itemData);
 
     QDrag *drag = new QDrag(this);
     drag->setMimeData(mimeData);
     drag->setPixmap(pixmap);
     drag->setHotSpot(event->pos() - child->pos());
 
     QPixmap tempPixmap = pixmap;
     QPainter painter;
     painter.begin(&tempPixmap);
     painter.fillRect(pixmap.rect(), QColor(127, 127, 127, 127));
     painter.end();
 
     child->setPixmap(tempPixmap);
 
     if (drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction) == Qt::MoveAction)
         child->close();
     else {
         child->show();
         child->setPixmap(pixmap);
     }
 }