Qt Reference Documentation

# draglabel.cpp Example File

draganddrop/fridgemagnets/draglabel.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** 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 Nokia Corporation 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;
     }