Mega Code Archive
Port for drop event
<![CDATA[
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QString>
#include <QStringList>
#include <QWidget>
class QComboBox;
class QFrame;
class QLabel;
class MyWidget : public QWidget
{
Q_OBJECT
public:
MyWidget(QWidget *parent = 0);
protected:
void dragEnterEvent(QDragEnterEvent *event);
void dropEvent(QDropEvent *event);
void mousePressEvent(QMouseEvent *event);
private:
QComboBox *mimeTypeCombo;
QFrame *dropFrame;
QLabel *dataLabel;
QString oldText;
QStringList oldMimeTypes;
};
#endif
#include <QtGui>
#include "window.h"
MyWidget::MyWidget(QWidget *parent)
: QWidget(parent)
{
QLabel *textLabel = new QLabel(tr("Data:"), this);
dataLabel = new QLabel(this);
dataLabel->setFixedSize(200, 200);
QVBoxLayout *layout = new QVBoxLayout(this);
layout->addWidget(textLabel);
layout->addWidget(dataLabel);
setAcceptDrops(true);
setWindowTitle(tr("Drop Events"));
}
void MyWidget::dragEnterEvent(QDragEnterEvent *event)
{
if (event->mimeData()->hasText() || event->mimeData()->hasImage())
event->acceptProposedAction();
}
void MyWidget::dropEvent(QDropEvent *event)
{
if (event->mimeData()->hasText())
dataLabel->setText(event->mimeData()->text());
else if (event->mimeData()->hasImage()) {
QVariant imageData = event->mimeData()->imageData();
dataLabel->setPixmap(qvariant_cast<QPixmap>(imageData));
}
event->acceptProposedAction();
}
void MyWidget::mousePressEvent(QMouseEvent *event)
{
QString text = dataLabel->text();
QPixmap iconPixmap(32, 32);
iconPixmap.fill(qRgba(255, 0, 0, 127));
QImage image(100, 100, QImage::Format_RGB32);
image.fill(qRgb(0, 0, 255));
if (event->button() == Qt::LeftButton) {
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setText(text);
mimeData->setImageData(image);
drag->setMimeData(mimeData);
drag->setPixmap(iconPixmap);
Qt::DropAction dropAction = drag->exec();
// ...
event->accept();
}
else if (event->button() == Qt::MidButton) {
QDrag *drag = new QDrag(this);
QMimeData *mimeData = new QMimeData;
mimeData->setImageData(image);
drag->setMimeData(mimeData);
drag->setPixmap(iconPixmap);
Qt::DropAction dropAction = drag->exec();
// ...
event->accept();
}
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWidget window;
window.show();
return app.exec();
}
]]>