Russian Qt Forum

bool MyScreenShot::eventFilter(QObject *obj, QEvent *event)
{
    QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);

    if (event->type()==QEvent::MouseButtonPress)
    {
        start_paint = true;

        curX = startX = mouseEvent->pos().x();
        curY = startY = mouseEvent->pos().y();
    }

    if (event->type()==QEvent::MouseButtonRelease && start_paint)
    {
        start_paint = false;

        endX = mouseEvent->pos().x();
        endY = mouseEvent->pos().y();
    }

    if (event->type()==QEvent::MouseMove && start_paint)
    {
        endX = mouseEvent->pos().x();
        endY = mouseEvent->pos().y();

        QPainter p1( &theImage );
        p1.setPen(QPen(Qt::black, 3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        p1.setBrush(Qt::yellow);
        p1.drawLine(curX,curY,endX,endY);
        p1.end();

        update();
        repaint();

        curX = mouseEvent->pos().x();
        curY = mouseEvent->pos().y();
    }

    return false;
}