Change the color of a QProgressBar - c++

Question

I am running ubuntu 11.04. This is what my progress bars look like:
I am showing the progress bars in a batch processing window (one per batch item) and would like to use them as a status indicator (green while all is going well, red in case of errors, ...).
I have tried several suggestions, including the ones made to this almost identical question. Unfortunately, I couldn't make it work and the documentation on customizing QProgressBars doesn't help me either, so I would be very grateful for any suggestions as to what I'm doing wrong.
I have subclassed the QProgressBar as suggested and have tried using stylesheets as well as the palette (not at the same time but as alternatives). With stylesheets, I can't make it look anything like the regular progress bars. Changing the color is really all I want to do, so I figured it should be much easier to do that by use of a palette instead of a stylesheet, but with the palette nothing happens at all.
Here is one of the versions I've tried for the palette:
#include "myprogressbar.h"
#include <QtGui/QPalette>
MyProgressBar::MyProgressBar(QWidget *parent) :
QProgressBar(parent)
{}
void MyProgressBar::onProgress(int value, int maximum, QString phase)
{
setMaximum(maximum);
setValue(value);
setFormat(phase);
QPalette p = this->palette();
p.setColor(QPalette::Highlight, QColor(Qt::green));
this->setPalette(p);
}
...
I also tried the version suggested here, but that didn't help either.

Answer 1

It tried this :
QProgressBar {
border: 2px solid grey;
border-radius: 5px;
background-color: #FF0000;
}
QProgressBar::chunk {
background-color: #05B8CC;
width: 20px;
}
as styleSheet for the progressBar and I got this
so it is easy to change the background of the bar to the color you want and you can display a text by yourself with setFormat(). Is it working for you?

Answer 2

Using the "Highlight" color role does the trick in my case (using Plastique style).
QPalette p = palette();
p.setColor(QPalette::Highlight, Qt::green);
setPalette(p);

Answer 3

I had this problem too, but I find a way, with the help of this site:
http://thesmithfam.org/blog/2009/10/13/cool-qprogressbar-stylesheet/
but I just wanted to change the color and not the progressbar itself. so I got rid of the first line, and change the second one a little bit.
Finally I got what I wanted.
First do this:
QString danger = "QProgressBar::chunk {background: QLinearGradient( x1: 0, y1: 0, x2: 1, y2: 0,stop: 0 #FF0350,stop: 0.4999 #FF0020,stop: 0.5 #FF0019,stop: 1 #FF0000 );border-bottom-right-radius: 5px;border-bottom-left-radius: 5px;border: .px solid black;}";
QString safe= "QProgressBar::chunk {background: QLinearGradient( x1: 0, y1: 0, x2: 1, y2: 0,stop: 0 #78d,stop: 0.4999 #46a,stop: 0.5 #45a,stop: 1 #238 );border-bottom-right-radius: 7px;border-bottom-left-radius: 7px;border: 1px solid black;}";
Now all you have to do is:
if(ui->progressbar->value()<80)
ui->progressbar->setStyleSheet(danger);
else
ui->progressbar->setStyleSheet(safe);