Class EventObserver
- protocol ooodev.proto.event_observer.EventObserver[source]
Protocol Class for Event Observer.
See also
lo_events
Classes that implement this protocol must have the following methods / attributes:
- add_observer(*args)[source]
Adds observers that gets their
trigger
method called when this classtrigger
method is called.- Parameters:
args (EventObserver) – One or more observers to add.
- Return type:
None
Note
Observers are removed automatically when they are out of scope.
- on(event_name, callback)[source]
Registers an event
- Parameters:
event_name (str) – Unique event name
callback (Callable[[object, EventArgs], None]) – Callback function
- remove(event_name, callback)[source]
Removes an event callback
- Parameters:
event_name (str) – Unique event name
callback (Callable[[object, EventArgs], None]) – Callback function
- Returns:
True if callback has been removed; Otherwise, False. False means the callback was not found.
- Return type:
bool
- remove_observer(observer)[source]
Removes an observer
- Parameters:
observer (EventObserver) – One or more observers to add.
- Returns:
True
if observer has been removed; Otherwise,False
.- Return type:
bool