QSlider with Text at the tick marks - qt

Question

I have some horizontal QSliders in my Qt application with 4-5 ticks marks. How can I add QLabels above the slider ticks to reflect the value at each of the ticks?
I suspect the best way to do this is to create a subclass of QSlider and override the paintEvent() method like this answer describes. But how would I add QLabels based on the position of the ticks?
For clarification:
I am looking for Text labels at each tick, ie if I have a slider that goes from 0 - 100 with 4 ticks, the ticks would have "0", "25", "50", and "100" above them, respectively. Your solution is still helpful, I believe I should be able to rework it using this->geometry to get the coordinates and dividing by # of ticks (which I believe I can calculate with (max - min/tick interval)

Answer 1

There is an implementation in PySide that works properly. It displays the rounded value of each tick, you can replace it with whatever text you need by updating the QPainter::drawText callback.
Long time ago, I did port that code to C++. This is the interesting part:
void MySlider::painEvent(...) {
QSlider::paintEvent(self, event)
auto round_value = std::floor(value());
auto painter = new QPainter(this);
painter->setPen(QPen(Qt::white));
auto font_metrics = QFontMetrics(this->font());
auto font_width = font_metrics.boundingRect(QString::number(round_value)).width();
auto font_height = font_metrics.boundingRect(QString::number(round_value)).height();
auto rect = w.geometry();
if (this->orientation() == Qt::Horizontal) {
auto horizontal_x_pos = rect.width() - font_width - 5;
auto horizontal_y_pos = rect.height() * 0.75;
painter->drawText(QPoint(horizontal_x_pos, horizontal_y_pos),
QString::number(round_value));
} else if (this->orientation() == Qt::Vertical) {
auto vertical_x_pos = rect.width() - font_width - 5;
auto vertical_y_pos = rect.height() * 0.75;
painter->drawText(QPoint(rect.width() / 2.0 - font_width / 2.0, rect.height() - 5),
QString::number(round_value));
} else {
return;
}
painter->drawRect(rect)
}