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# Copyright (c) 2014-2015, Max Zwiessele
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#===============================================================================
from .observable import Observable
[docs]class Updateable(Observable):
"""
A model can be updated or not.
Make sure updates can be switched on and off.
"""
def __init__(self, *args, **kwargs):
super(Updateable, self).__init__(*args, **kwargs)
[docs] def update_model(self, updates=None):
"""
Get or set, whether automatic updates are performed. When updates are
off, the model might be in a non-working state. To make the model work
turn updates on again.
:param bool|None updates:
bool: whether to do updates
None: get the current update state
"""
if updates is None:
return self._update_on
assert isinstance(updates, bool), "updates are either on (True) or off (False)"
p = getattr(self, '_highest_parent_', None)
def turn_updates(s):
s._update_on = updates
p.traverse(turn_updates)
self.trigger_update()
[docs] def toggle_update(self):
print("deprecated: toggle_update was renamed to update_toggle for easier access")
self.update_toggle()
[docs] def update_toggle(self):
self.update_model(not self.update_model())
[docs] def trigger_update(self, trigger_parent=True):
"""
Update the model from the current state.
Make sure that updates are on, otherwise this
method will do nothing
:param bool trigger_parent: Whether to trigger the parent, after self has updated
"""
if not self.update_model() or (hasattr(self, "_in_init_") and self._in_init_):
#print "Warning: updates are off, updating the model will do nothing"
return
self._trigger_params_changed(trigger_parent)