6abb0976c2
* Second websocket channel for the projector * Removed use of projector requirements for REST API requests. Refactored data serializing for projector websocket connection. * Refactor the way that the projector autoupdate get its data. * Fixed missing assignment slide title for hidden items. * Release all items for item list slide and list of speakers slide. Fixed error with motion workflow. * Created CollectionElement class which helps to handle autoupdate.
75 lines
2.4 KiB
Python
75 lines
2.4 KiB
Python
from django.dispatch import Signal
|
|
|
|
from .dispatch import SignalConnectMetaClass
|
|
|
|
|
|
class ProjectorElement(object, metaclass=SignalConnectMetaClass):
|
|
"""
|
|
Base class for an element on the projector.
|
|
|
|
Every app which wants to add projector elements has to create classes
|
|
subclassing from this base class with different names. The name attribute
|
|
has to be set. The metaclass (SignalConnectMetaClass) does the rest of the
|
|
magic.
|
|
"""
|
|
signal = Signal()
|
|
name = None
|
|
|
|
def __init__(self, **kwargs):
|
|
"""
|
|
Initializes the projector element instance. This is done when the
|
|
signal is sent.
|
|
|
|
Because of Django's signal API, we have to take wildcard keyword
|
|
arguments. But they are not used here.
|
|
"""
|
|
pass
|
|
|
|
@classmethod
|
|
def get_dispatch_uid(cls):
|
|
"""
|
|
Returns the classname as a unique string for each class. Returns None
|
|
for the base class so it will not be connected to the signal.
|
|
"""
|
|
if not cls.__name__ == 'ProjectorElement':
|
|
return cls.__name__
|
|
|
|
def check_and_update_data(self, projector_object, config_entry):
|
|
"""
|
|
Checks projector element data via self.check_data() and updates
|
|
them via self.update_data(). The projector object and the config
|
|
entry have to be given.
|
|
"""
|
|
self.projector_object = projector_object
|
|
self.config_entry = config_entry
|
|
assert self.config_entry.get('name') == self.name, (
|
|
'To get data of a projector element, the correct config entry has to be given.')
|
|
self.check_data()
|
|
return self.update_data() or {}
|
|
|
|
def check_data(self):
|
|
"""
|
|
Method can be overridden to validate projector element data. This
|
|
may raise ProjectorException in case of an error.
|
|
|
|
Default: Does nothing.
|
|
"""
|
|
pass
|
|
|
|
def update_data(self):
|
|
"""
|
|
Method can be overridden to update the projector element data
|
|
output. This should return a dictonary. Use this for server
|
|
calculated data which have to be forwared to the client.
|
|
|
|
Default: Does nothing.
|
|
"""
|
|
pass
|
|
|
|
def get_requirements(self, config_entry):
|
|
"""
|
|
Returns an iterable of instances that are required for this projector
|
|
element. The config_entry has to be given.
|
|
"""
|
|
return ()
|