droparea.cpp Example File
draganddrop/dropsite/droparea.cpp
/****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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 GNU
** General Public Licensing requirements will be met:
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**
** If you are unsure which license is appropriate for your use, please
** review the following information:
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** sales department at sales@trolltech.com.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/
#include <QtGui>
#include "droparea.h"
DropArea::DropArea(QWidget *parent)
: QLabel(parent)
{
setMinimumSize(200, 200);
setFrameStyle(QFrame::Sunken | QFrame::StyledPanel);
setAlignment(Qt::AlignCenter);
setAcceptDrops(true);
setAutoFillBackground(true);
clear();
}
void DropArea::dragEnterEvent(QDragEnterEvent *event)
{
setText(tr("<drop content>"));
setBackgroundRole(QPalette::Highlight);
event->acceptProposedAction();
emit changed(event->mimeData());
}
void DropArea::dragMoveEvent(QDragMoveEvent *event)
{
event->acceptProposedAction();
}
void DropArea::dropEvent(QDropEvent *event)
{
const QMimeData *mimeData = event->mimeData();
if (mimeData->hasImage()) {
setPixmap(qvariant_cast<QPixmap>(mimeData->imageData()));
} else if (mimeData->hasHtml()) {
setText(mimeData->html());
setTextFormat(Qt::RichText);
} else if (mimeData->hasText()) {
setText(mimeData->text());
setTextFormat(Qt::PlainText);
} else {
setText(tr("Cannot display data"));
}
setBackgroundRole(QPalette::Dark);
event->acceptProposedAction();
}
void DropArea::dragLeaveEvent(QDragLeaveEvent *event)
{
clear();
event->accept();
}
void DropArea::clear()
{
setText(tr("<drop content>"));
setBackgroundRole(QPalette::Dark);
emit changed();
}
QPixmap DropArea::extractPixmap(const QByteArray &data, const QString &format)
{
QList<QByteArray> imageFormats = QImageReader::supportedImageFormats();
QPixmap pixmap;
foreach (QByteArray imageFormat, imageFormats) {
if (format.mid(6) == QString(imageFormat)) {
pixmap.loadFromData(data, imageFormat);
break;
}
}
return pixmap;
}