Qt 4.6: draglabel.cpp Example File (draganddrop/fridgemagnets/draglabel.cpp)

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

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     #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;
     }