mirror of
https://github.com/bisq-network/bisq-api-reference.git
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49404cebc5
- Use requirements.txt to install dependencies to local venv. - Use setup.py to build/install example packages to local venv. - Adjust reference-doc-builder to new Python pkg imports.
66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
# From https://expobrain.net/2010/07/31/simple-event-dispatcher-in-python
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class EventDispatcher(object):
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"""
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Generic event dispatcher which listen and dispatch events
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"""
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def __init__(self):
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self._events = dict()
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def __del__(self):
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"""
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Remove all listener references at destruction time
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"""
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self._events = None
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def has_listener(self, event_type, listener):
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"""
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Return true if listener is register to event_type
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"""
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# Check for event type and for the listener
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if event_type in self._events.keys():
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return listener in self._events[event_type]
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else:
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return False
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def dispatch_event(self, event):
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"""
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Dispatch an instance of Event class
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"""
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# Dispatch the event to all the associated listeners
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if event.type in self._events.keys():
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listeners = self._events[event.type]
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for listener in listeners:
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listener(event)
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def add_event_listener(self, event_type, listener):
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"""
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Add an event listener for an event type
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"""
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# Add listener to the event type
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if not self.has_listener(event_type, listener):
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listeners = self._events.get(event_type, [])
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listeners.append(listener)
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self._events[event_type] = listeners
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def remove_event_listener(self, event_type, listener):
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"""
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Remove event listener.
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"""
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# Remove the listener from the event type
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if self.has_listener(event_type, listener):
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listeners = self._events[event_type]
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if len(listeners) == 1:
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# Only this listener remains so remove the key
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del self._events[event_type]
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else:
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# Update listeners chain
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listeners.remove(listener)
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self._events[event_type] = listeners
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