draglabel.cpp Example File

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 #include <QtWidgets>

 #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;
 }