def _observe_tree(object, listener):
if not isobserved(object, listener): # Avoid troubles with cyclic list / dict
observe(object, listener)
children = custom._find_children(object)
if not children is None:
if not children is object:
observe(children, listener)
for item in children:
_observe_tree(item, listener)
def unobserve_tree(object, listener):
"""unobserve_tree(object, listener)
Unregisters the tree listener LISTENER for OBJECT."""
if isobserved(object, listener): # Avoid troubles with cyclic list / dict
unobserve(object, listener)
children = custom._find_children(object)
if not children is None:
if not children is object:
unobserve(children, listener)
for item in children:
unobserve_tree(item, listener)
