Custom progress bar with cancel button and label overlay.

Custom Progress Bar

class ProgressBar(QtGui.QWidget):
    """
    Custom progress bar hack that allows text over a 'busy' progress bar.
    Also adds a cancel button.
    """
    cancel = QtCore.Signal(object)
    def __init__(self, parent = None):
        QtGui.QWidget.__init__(self, parent)
        
        # Progress Bar
        self.bar = QtGui.QProgressBar()
        
        # Label over progress bar
        self.label = QtGui.QLabel()
        
        # cancel button
        self.cancelButton = QtGui.QToolButton()
        self.cancelButton.setAutoRaise(True)
        self.cancelButton.pressed.connect(lambda:self.cancel.emit(True))
        
        grid = QtGui.QGridLayout()
        grid.setSpacing(0)
        grid.setContentsMargins(0, 0, 0, 0)
        
        grid.addWidget(self.bar, 0, 0)
        grid.addWidget(self.label, 0, 0)
        grid.addWidget(self.cancelButton, 0, 1)
        
        self.setLayout(grid)
        
    def setRange(self, min_, max_):
        self.bar.setRange(min_, max_)
        
    def setMaximum(self, value):
        self.bar.setMaximum = value
        
    def setMinimum(self, value):
        self.bar.setMinimum = value
        
    def setValue(self, value):
        self.bar.setValue(value)
        
    def setFormat(self, text):
        if self.bar.maximum() == self.bar.minimum() == 0:
            self.label.setText(text)
            self.label.show()
        else:
            self.label.hide()
            self.bar.setFormat(text)