doc/src/snippets/porting4-dropevents/window.cpp
author eckhart.koppen@nokia.com
Wed, 31 Mar 2010 11:06:36 +0300
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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 documentation 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 "window.h"
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MyWidget::MyWidget(QWidget *parent)
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    : QWidget(parent)
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{
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    QLabel *textLabel = new QLabel(tr("Data:"), this);
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    dataLabel = new QLabel(this);
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    dataLabel->setFixedSize(200, 200);
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    QVBoxLayout *layout = new QVBoxLayout(this);
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    layout->addWidget(textLabel);
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    layout->addWidget(dataLabel);
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    setAcceptDrops(true);
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    setWindowTitle(tr("Drop Events"));
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}
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//! [0]
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void MyWidget::dragEnterEvent(QDragEnterEvent *event)
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{
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    if (event->mimeData()->hasText() || event->mimeData()->hasImage())
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        event->acceptProposedAction();
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}
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//! [0]
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//! [1]
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void MyWidget::dropEvent(QDropEvent *event)
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{
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    if (event->mimeData()->hasText())
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        dataLabel->setText(event->mimeData()->text());
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    else if (event->mimeData()->hasImage()) {
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        QVariant imageData = event->mimeData()->imageData();
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        dataLabel->setPixmap(qvariant_cast<QPixmap>(imageData));
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    }
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    event->acceptProposedAction();
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}
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//! [1]
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//! [2]
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void MyWidget::mousePressEvent(QMouseEvent *event)
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{
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//! [2]
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    QString text = dataLabel->text();
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    QPixmap iconPixmap(32, 32);
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    iconPixmap.fill(qRgba(255, 0, 0, 127));
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    QImage image(100, 100, QImage::Format_RGB32);
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    image.fill(qRgb(0, 0, 255));
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//! [3]
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    if (event->button() == Qt::LeftButton) {
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        QDrag *drag = new QDrag(this);
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        QMimeData *mimeData = new QMimeData;
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        mimeData->setText(text);
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        mimeData->setImageData(image);
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        drag->setMimeData(mimeData);
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        drag->setPixmap(iconPixmap);
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        Qt::DropAction dropAction = drag->exec();
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//! [3]
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        // ...
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//! [4]
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        event->accept();
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    }
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//! [4]
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    else if (event->button() == Qt::MidButton) {
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        QDrag *drag = new QDrag(this);
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        QMimeData *mimeData = new QMimeData;
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        mimeData->setImageData(image);
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        drag->setMimeData(mimeData);
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        drag->setPixmap(iconPixmap);
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        Qt::DropAction dropAction = drag->exec();
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        // ...
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        event->accept();
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    }
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//! [5]
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}
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//! [5]