draglabel.cpp Example File
draganddrop/fridgemagnets/draglabel.cpp
/****************************************************************************
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** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
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** This file is part of the documentation of the Qt Toolkit.
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#include <QtGui>
#include "draglabel.h"
DragLabel::DragLabel(const QString &text, QWidget *parent)
: QLabel(parent)
{
QFontMetrics fm(font());
QSize size = fm.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.drawRoundRect(QRectF(0.5, 0.5, image.width()-1, image.height()-1), 25, 25);
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->start(Qt::MoveAction) == Qt::MoveAction)
close();
else
show();
}