Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions

draglabel.cpp Example File
draganddrop/fridgemagnets/draglabel.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** 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 General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License versions 2.0 or 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 GNU General Public Licensing requirements will be met:
 ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
 ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
 ** exception, Nokia gives you certain additional rights. These rights
 ** are described in the Nokia Qt GPL Exception version 1.3, included in
 ** the file GPL_EXCEPTION.txt in this package.
 **
 ** Qt for Windows(R) Licensees
 ** As a special exception, Nokia, as the sole copyright holder for Qt
 ** Designer, grants users of the Qt/Eclipse Integration plug-in the
 ** right for the Qt/Eclipse Integration to link to functionality
 ** provided by Qt Designer and its related libraries.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 **
 ****************************************************************************/

 #include <QtGui>

 #include "draglabel.h"

 DragLabel::DragLabel(const QString &text, QWidget *parent)
     : QLabel(parent)
 {
     QFontMetrics metric(font());
     QSize size = metric.size(Qt::TextSingleLine, text);

     QImage image(size.width() + 12, size.height() + 12,
                  QImage::Format_ARGB32_Premultiplied);
     image.fill(qRgba(0, 0, 0, 0));

     QFont font;
     font.setStyleStrategy(QFont::ForceOutline);

     QPainter painter;
     painter.begin(&image);
     painter.setRenderHint(QPainter::Antialiasing);
     painter.setBrush(Qt::white);
     painter.drawRoundedRect(QRectF(0.5, 0.5, image.width()-1, image.height()-1),
                             25, 25, Qt::RelativeSize);

     painter.setFont(font);
     painter.setBrush(Qt::black);
     painter.drawText(QRect(QPoint(6, 6), size), Qt::AlignCenter, text);
     painter.end();

     setPixmap(QPixmap::fromImage(image));
     labelText = text;
 }

 void DragLabel::mousePressEvent(QMouseEvent *event)
 {
     QByteArray itemData;
     QDataStream dataStream(&itemData, QIODevice::WriteOnly);
     dataStream << labelText << QPoint(event->pos() - rect().topLeft());

     QMimeData *mimeData = new QMimeData;
     mimeData->setData("application/x-fridgemagnet", itemData);
     mimeData->setText(labelText);

     QDrag *drag = new QDrag(this);
     drag->setMimeData(mimeData);
     drag->setHotSpot(event->pos() - rect().topLeft());
     drag->setPixmap(*pixmap());

     hide();

     if (drag->exec(Qt::MoveAction | Qt::CopyAction, Qt::CopyAction) == Qt::MoveAction)
         close();
     else
         show();
 }