def __init__(self, parent=None):
""" QVersionTreeView(parent: QWidget) -> QVersionTreeView
Initialize the graphics view and its properties
"""
QInteractiveGraphicsView.__init__(self, parent)
BaseView.__init__(self)
self.controller = None
self.set_title('Version Tree')
self.setScene(QVersionTreeScene(self))
self.versionProp = QVersionPropOverlay(self, self.viewport())
self.versionProp.hide()
self._view_fitted = False
