QSlider mouse direct jump

Question

Instead of stepping when the user clicks somewhere on the qslider I want to make the slider jump to that position. How can this be implemented ?

Answer 1

I also met this problem. My solution is shown below.

slider->installEventFilter(this);
---    
bool MyDialog::eventFilter(QObject *object, QEvent *event)
    {
        if (object == slider && slider->isEnabled())
        {
            if (event->type() == QEvent::MouseButtonPress)
            {
                auto mevent = static_cast(event);
                qreal value = slider->minimum() + (slider->maximum() - slider->minimum()) * mevent->localPos().x() / slider->width();
                if (mevent->button() == Qt::LeftButton)
                {
                    slider->setValue(qRound(value));
                }
                event->accept();
                return true;
            }
            if (event->type() == QEvent::MouseMove)
            {
                auto mevent = static_cast(event);
                qreal value = slider->minimum() + (slider->maximum() - slider->minimum()) * mevent->localPos().x() / slider->width();
                if (mevent->buttons() & Qt::LeftButton)
                {
                    slider->setValue(qRound(value));
                }
                event->accept();
                return true;
            }
            if (event->type() == QEvent::MouseButtonDblClick)
            {
                event->accept();
                return true;
            }
        }
        return QDialog::eventFilter(object, event);
    }

You can also override these event handlers of QSlider.

• QSlider::mousePressedEvent
• QSlider::mouseMoveEvent
• QSlider::mouseDoubleClickEvent