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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
'''
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Created on 11 Nov 2014
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@author: maxz
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'''
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from observable import Observable
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class Updateable(Observable):
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"""
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A model can be updated or not.
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Make sure updates can be switched on and off.
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"""
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_updates = True
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def __init__(self, *args, **kwargs):
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super(Updateable, self).__init__(*args, **kwargs)
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def update_model(self, updates=None):
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"""
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Get or set, whether automatic updates are performed. When updates are
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off, the model might be in a non-working state. To make the model work
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turn updates on again.
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:param bool|None updates:
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bool: whether to do updates
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None: get the current update state
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"""
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if updates is None:
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return self._update_on
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assert isinstance(updates, bool), "updates are either on (True) or off (False)"
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p = getattr(self, '_highest_parent_', None)
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def turn_updates(s):
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s._update_on = updates
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p.traverse(turn_updates)
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self.trigger_update()
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def toggle_update(self):
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print "deprecated: toggle_update was renamed to update_toggle for easier access"
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self.update_toggle()
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def update_toggle(self):
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self.update_model(not self.update_model())
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def trigger_update(self, trigger_parent=True):
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"""
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Update the model from the current state.
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Make sure that updates are on, otherwise this
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method will do nothing
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:param bool trigger_parent: Whether to trigger the parent, after self has updated
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"""
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if not self.update_model() or (hasattr(self, "_in_init_") and self._in_init_):
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#print "Warning: updates are off, updating the model will do nothing"
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return
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self._trigger_params_changed(trigger_parent)
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