elif modifiers == QtCore.Qt.AltModifier and key == QtCore.Qt.Key_PageUp:
bar.setValue(bar.value() - (bar.pageStep() / 10))
elif modifiers == QtCore.Qt.AltModifier and key == QtCore.Qt.Key_PageDown:
elif modifiers == QtCore.Qt.AltModifier and key == QtCore.Qt.Key_PageUp:
bar.setValue(bar.value() - (bar.pageStep() / 10))
elif modifiers == QtCore.Qt.AltModifier and key == QtCore.Qt.Key_PageDown: