def __init__(self, parent=None):
super(FlickCharm, self).__init__(parent=parent)
self.flickData = {}
self.ticker = QtCore.QBasicTimer()
# The flick button to use
self.button = QtCore.Qt.LeftButton
# The time taken per update tick of flicking behavior
self.tick_time = 20
# Allow a item click/press directly when AutoScroll is slower than
# this threshold velocity
self.click_in_autoscroll_threshold = 10
# Allow an item click/press to propagate as opposed to scrolling
# when the cursor travelled less than this amount of pixels
# Note: back & forth motion increases the value too
self.travel_threshold = 20
self.max_speed = 64 # max scroll speed
self.drag = 1 # higher drag will stop autoscroll faster
