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# reverted to the older API until the new one is merged to trunk.
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gesture_manager.register_window(
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self.window, Grip.GestureType.PINCH, finger_count,self.callback,
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self.window, Grip.GestureType.PINCH, finger_count, self.callback, None)
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def callback(self, window, time_type, gesture_type, gesture_event):