examples/draganddrop/fridgemagnets/dragwidget.cpp
author Eckhart Koeppen <eckhart.koppen@nokia.com>
Wed, 28 Apr 2010 13:15:16 +0300
branchRCL_3
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2010-17 8b4fb6db9a24f58dafbd4734d9c4a87a72f9ad8f
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtGui>
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#include "draglabel.h"
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#include "dragwidget.h"
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//! [0]
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DragWidget::DragWidget(QWidget *parent)
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    : QWidget(parent)
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{
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    QFile dictionaryFile(":/dictionary/words.txt");
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    dictionaryFile.open(QFile::ReadOnly);
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    QTextStream inputStream(&dictionaryFile);
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//! [0]
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//! [1]
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    int x = 5;
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    int y = 5;
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    while (!inputStream.atEnd()) {
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        QString word;
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        inputStream >> word;
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        if (!word.isEmpty()) {
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            DragLabel *wordLabel = new DragLabel(word, this);
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            wordLabel->move(x, y);
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            wordLabel->show();
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            wordLabel->setAttribute(Qt::WA_DeleteOnClose);
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            x += wordLabel->width() + 2;
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            if (x >= 245) {
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                x = 5;
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                y += wordLabel->height() + 2;
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            }
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        }
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    }
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//! [1]
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//! [2]
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    #ifndef Q_WS_S60
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    //Fridge magnets is used for demoing Qt on S60 and themed backgrounds look better than white
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    QPalette newPalette = palette();
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    newPalette.setColor(QPalette::Window, Qt::white);
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    setPalette(newPalette);
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    #endif
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    setMinimumSize(400, qMax(200, y));
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    setWindowTitle(tr("Fridge Magnets"));
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//! [2] //! [3]
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    setAcceptDrops(true);
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}
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//! [3]
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//! [4]
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void DragWidget::dragEnterEvent(QDragEnterEvent *event)
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{
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//! [4] //! [5]
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    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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        if (children().contains(event->source())) {
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            event->setDropAction(Qt::MoveAction);
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            event->accept();
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        } else {
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            event->acceptProposedAction();
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//! [5] //! [6]
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        }
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//! [6] //! [7]
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    } else if (event->mimeData()->hasText()) {
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        event->acceptProposedAction();
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    } else {
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        event->ignore();
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    }
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}
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//! [7]
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//! [8]
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void DragWidget::dragMoveEvent(QDragMoveEvent *event)
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{
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    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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        if (children().contains(event->source())) {
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            event->setDropAction(Qt::MoveAction);
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            event->accept();
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        } else {
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            event->acceptProposedAction();
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        }
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    } else if (event->mimeData()->hasText()) {
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        event->acceptProposedAction();
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    } else {
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        event->ignore();
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    }
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}
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//! [8]
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//! [9]
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void DragWidget::dropEvent(QDropEvent *event)
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{
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    if (event->mimeData()->hasFormat("application/x-fridgemagnet")) {
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        const QMimeData *mime = event->mimeData();
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//! [9] //! [10]
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        QByteArray itemData = mime->data("application/x-fridgemagnet");
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        QDataStream dataStream(&itemData, QIODevice::ReadOnly);
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        QString text;
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        QPoint offset;
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        dataStream >> text >> offset;
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//! [10]
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//! [11]
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        DragLabel *newLabel = new DragLabel(text, this);
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        newLabel->move(event->pos() - offset);
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        newLabel->show();
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        newLabel->setAttribute(Qt::WA_DeleteOnClose);
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        if (event->source() == this) {
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            event->setDropAction(Qt::MoveAction);
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            event->accept();
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        } else {
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            event->acceptProposedAction();
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        }
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//! [11] //! [12]
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    } else if (event->mimeData()->hasText()) {
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        QStringList pieces = event->mimeData()->text().split(QRegExp("\\s+"),
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                             QString::SkipEmptyParts);
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        QPoint position = event->pos();
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        foreach (QString piece, pieces) {
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            DragLabel *newLabel = new DragLabel(piece, this);
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            newLabel->move(position);
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            newLabel->show();
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            newLabel->setAttribute(Qt::WA_DeleteOnClose);
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            position += QPoint(newLabel->width(), 0);
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        }
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        event->acceptProposedAction();
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    } else {
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        event->ignore();
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    }
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}
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//! [12]
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//! [13]
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void DragWidget::mousePressEvent(QMouseEvent *event)
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{
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//! [13]
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//! [14]
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    DragLabel *child = static_cast<DragLabel*>(childAt(event->pos()));
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    if (!child)
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        return;
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    QPoint hotSpot = event->pos() - child->pos();
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    QByteArray itemData;
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    QDataStream dataStream(&itemData, QIODevice::WriteOnly);
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    dataStream << child->labelText() << QPoint(hotSpot);
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//! [14]
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//! [15]
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    QMimeData *mimeData = new QMimeData;
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    mimeData->setData("application/x-fridgemagnet", itemData);
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    mimeData->setText(child->labelText());
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//! [15]
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//! [16]
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    QDrag *drag = new QDrag(this);
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    drag->setMimeData(mimeData);
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    drag->setPixmap(*child->pixmap());
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    drag->setHotSpot(hotSpot);
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    child->hide();
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//! [16]
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//! [17]
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    if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)
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        child->close();
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    else
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        child->show();
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}
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//! [17]