Style QProgressBar when the value is 16 - qt

Question

It is possible to style the QProgressBar using only QSS when the value is 16 example?
ui->progresso->setValue(16);
Using a QSS like this:
QProgressBar {
//Default QSS
...
}
QProgressBar:value(16) {
background-color: #fc0;
}
My goal is:
- When the QProgressBar is 0: It will use background-color: transparent
- When the QProgressBar is greater than 0: show a gray bar and the "chunk" will be blue
- When the QProgressBar is greater than 89: shows the "chunk" in red.
I can do this with QT + C++, but would like to know is it is possible to do this only with QSS?
Like this (this code does not exist, is just one example):
QProgressBar {
background-color: gray;
}
QProgressBar:value(0) {
background-color: transparent;
}
QProgressBar::chunk {
background-color: blue;
}
QProgressBar::chunk:minValue(90) {
background-color: red;
}

Answer 1

I think it is possible with help of Property Selector but only for exect values i.e.:
QProgressBar[value = 16]::chunk{
background-color: red;
}
but you can generate such stilesheet in code for each value
QString styleSheet;
for(int i = 0; i < 101; i++)
{
styleSheet.append(QString("QProgressBar[value = \"%1\"]::chunk{background-color: %2;}").arg(QString::number(i), (i < 17 ? "red" :"blue")));
}
myProgressBar->setStyleSheet(styleSheet);
I don't try it. It's just a theory based on documentation.
Update 1
Warning: If the value of the Qt property changes after the style sheet has been set, it might be necessary to force a style sheet recomputation. One way to achieve this is to unset the style sheet and set it again.

Answer 2

This is not possible.
The only valid extensions are in the documentation and too long to post here.
However you could handle the valueChanged( int ) signal of the QProgressBar
and set the stylesheet accordingly using setStyleSheet( ) but I figure you already know that.