/****************************************************************************

**

** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

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

**

** $QT_BEGIN_LICENSE:BSD$

** You may use this file under the terms of the BSD license as follows:

**

** "Redistribution and use in source and binary forms, with or without

** modification, are permitted provided that the following conditions are

** met:

**   * Redistributions of source code must retain the above copyright

**     notice, this list of conditions and the following disclaimer.

**   * Redistributions in binary form must reproduce the above copyright

**     notice, this list of conditions and the following disclaimer in

**     the documentation and/or other materials provided with the

**     distribution.

**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor

**     the names of its contributors may be used to endorse or promote

**     products derived from this software without specific prior written

**     permission.

**

** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."

** $QT_END_LICENSE$

**

****************************************************************************/

#include <QtGui>

#include "draglabel.h"

#include "dragwidget.h"

DragWidget::DragWidget(QWidget *parent)

    : QWidget(parent)

{

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

    dictionaryFile.open(QIODevice::ReadOnly);

    QTextStream inputStream(&dictionaryFile);

    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 >= 195) {

                x = 5;

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

            }

        }

    }

    QPalette newPalette = palette();

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

    setPalette(newPalette);

    setAcceptDrops(true);

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

    setWindowTitle(tr("Draggable Text"));

}

void DragWidget::dragEnterEvent(QDragEnterEvent *event)

{

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

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

            event->setDropAction(Qt::MoveAction);

            event->accept();

        } else {

            event->acceptProposedAction();

        }

    } else {

        event->ignore();

    }

}

void DragWidget::dropEvent(QDropEvent *event)

{

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

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

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

                             QString::SkipEmptyParts);

        QPoint position = event->pos();

        QPoint hotSpot;

        QList<QByteArray> hotSpotPos = mime->data("application/x-hotspot").split(' ');

        if (hotSpotPos.size() == 2) {

            hotSpot.setX(hotSpotPos.first().toInt());

            hotSpot.setY(hotSpotPos.last().toInt());

        }

        foreach (QString piece, pieces) {

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

            newLabel->move(position - hotSpot);

            newLabel->show();

            newLabel->setAttribute(Qt::WA_DeleteOnClose);

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

        }

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

            event->setDropAction(Qt::MoveAction);

            event->accept();

        } else {

            event->acceptProposedAction();

        }

    } else {

        event->ignore();

    }

    foreach (QObject *child, children()) {

        if (child->inherits("QWidget")) {

            QWidget *widget = static_cast<QWidget *>(child);

            if (!widget->isVisible())

                widget->deleteLater();

        }

    }

}

void DragWidget::mousePressEvent(QMouseEvent *event)

{

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

    if (!child)

        return;

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

    QMimeData *mimeData = new QMimeData;

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

    mimeData->setData("application/x-hotspot",

                      QByteArray::number(hotSpot.x())

                      + " " + QByteArray::number(hotSpot.y()));

    QPixmap pixmap(child->size());

    child->render(&pixmap);

    QDrag *drag = new QDrag(this);

    drag->setMimeData(mimeData);

    drag->setPixmap(pixmap);

    drag->setHotSpot(hotSpot);

    Qt::DropAction dropAction = drag->exec(Qt::CopyAction | Qt::MoveAction, Qt::CopyAction);

    if (dropAction == Qt::MoveAction)

        child->close();

}