52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
from django.dispatch import Signal
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from .dispatch import SignalConnectMetaClass
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class PersonalInfo(object, metaclass=SignalConnectMetaClass):
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"""
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Base class for a personal info collection for the personal info widget
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on the dashboard.
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Every app which wants to add info has to create a class subclassing
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from this base class. For the content the headline attribute, the
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default_weight attribute and the get_queryset method have to be set.
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The metaclass (SignalConnectMetaClass) does the rest of
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the magic.
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"""
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signal = Signal(providing_args=['request'])
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headline = None
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default_weight = 0
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def __init__(self, sender, request, **kwargs):
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"""
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Initializes the personal info instance. This is done when the
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signal is sent.
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Only the required request argument is used. Because of Django's signal
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API, we have to take also a sender argument and wildcard keyword
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arguments. But they are not used here.
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"""
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self.request = request
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@classmethod
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def get_dispatch_uid(cls):
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"""
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Returns the classname as a unique string for each class. Returns
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None for the base class so it will not be connected to the signal.
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"""
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if not cls.__name__ == 'PersonalInfo':
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return cls.__name__
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def get_queryset(self):
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"""
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Returns a queryset of objects for the personal info widget.
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"""
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raise NotImplementedError('Your class %s has to define a get_queryset method.' % self.__class__)
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def is_active(self):
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"""
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Returns True if the infoblock is shown in the widget.
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"""
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return self.get_queryset() is not None
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