def __init__(self, timeAxis, parent=None):
"""
Parameter timeAxis points to Time Axis on which the time bars
are placed.
Parameter parent is a parent object in scene where time bars
will be displayed.
"""
super(TimeBar, self).__init__(parent)
self.timeAxis = timeAxis
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable, True)
self.setFlag(self.ItemSendsGeometryChanges, True)
# Create graphical subcomponents.
self.topTriangle = TimeBarTriangle(True)
self.topTriangle.setParentItem(self)
self.bottomTriangle = TimeBarTriangle(False)
self.bottomTriangle.setParentItem(self)
self.line = TimeBarLine()
self.line.setParentItem(self)
# Support data for drag and drop movement
self.movingItemsInitialPositions = None
self.signals = self.Signals()
