draglabel.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
 **     of its contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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);

     QLinearGradient gradient(0, 0, 0, image.height()-1);
     gradient.setColorAt(0.0, Qt::white);
     gradient.setColorAt(0.2, QColor(200, 200, 255));
     gradient.setColorAt(0.8, QColor(200, 200, 255));
     gradient.setColorAt(1.0, QColor(127, 127, 200));

     QPainter painter;
     painter.begin(&image);
     painter.setRenderHint(QPainter::Antialiasing);
     painter.setBrush(gradient);
     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));
     m_labelText = text;
 }

 QString DragLabel::labelText() const
 {
     return m_labelText;
 }