#
#   Python GUI - Mouse trackers - Generic
#

from GUI import application

class MouseTracker(object):
    """Iterator used to track movements of the mouse following a mouse_down
    event in a Views. Each call to the next() method returns a mouse_drag
    event, except for the last one, which returns a mouse_up event."""
    
    def __init__(self, view):
        self._view = view
        self._finished = 0
    
    def __iter__(self):
        return self
    
    def next(self):
        if not self._finished:
            event = self._next_mouse_event()
            event.position = event.position_in(self._view)
            if event.kind == 'mouse_up':
                self._finished = 1
            return event
        else:
            raise StopIteration
