def __init__(self, scroll):
super(EventsWidget, self).__init__()
self._scroll = scroll
# Timeline background color
palette = self.palette()
palette.setColor(self.backgroundRole(), QtCore.Qt.white)
self.setPalette(palette)
self._tracks = [Track(parent=self)] # List of tracks
self._pointer = TimelinePointer(0, self) # Timeline ( greenline )
self.tracks_height = 60
self._first_track = self._tracks[0]
