Changing the color of a QProgressbar()

I was wondering whether it's possible to change the color of a PyQt Progressbar?

I have the following code:

from PyQt4 import QtGui, QtCore
Pbar1 = QtGui.QProgressBar()
Pbar1.setParent(Frame1)
Pbar1.setGeometry(0, 0, 306, 30)
Pbar1.setValue(Frame1Value)
if Pbar1.value == 100
......Pbar1.setColor(Red)

Frame1Value is dependable on some early calculations, and to be assumed never calculates to exactly the same value.

I would like the progressbar to turn 'red' when the value is 100 (which the value is set limited开发者_开发技巧 at since a progressbar won't show values above 100%), so giving me a better visual image of the fact that the value is 'out of constraint'.

I am aware that .setColor isn't a known command for a Progressbar, but it's just to show my idea.

Does anyone know how to do this, or if it is even possible??

Thx in advance!

You can sublass QProgressBar and use some style sheet see Customizing Qt Widgets Using Style Sheets and Customizing QProgressBar:

from PyQt4 import QtGui, QtCore

DEFAULT_STYLE = """
QProgressBar{
    border: 2px solid grey;
    border-radius: 5px;
    text-align: center
}

QProgressBar::chunk {
    background-color: lightblue;
    width: 10px;
    margin: 1px;
}
"""

COMPLETED_STYLE = """
QProgressBar{
    border: 2px solid grey;
    border-radius: 5px;
    text-align: center
}

QProgressBar::chunk {
    background-color: red;
    width: 10px;
    margin: 1px;
}
"""

class MyProgressBar(QtGui.QProgressBar):
    def __init__(self, parent = None):
        QtGui.QProgressBar.__init__(self, parent)
        self.setStyleSheet(DEFAULT_STYLE)

    def setValue(self, value):
        QtGui.QProgressBar.setValue(self, value)

        if value == self.maximum():
            self.setStyleSheet(COMPLETED_STYLE)

Another solution would be to reassign a palette to the QProgressBar which will allow you to have a "style aware" component:

class MyProgressBar(QtGui.QProgressBar):
    def setValue(self, value):
        QtGui.QProgressBar.setValue(self, value)
        if value == self.maximum():
            palette = QtGui.QPalette(self.palette())
            palette.setColor(QtGui.QPalette.Highlight, 
                             QtGui.QColor(QtCore.Qt.red))
            self.setPalette(palette)