Lock a callback list in its current state. This method returns the Callbacks object onto which it

Determine if the callbacks have already been called at least once.

Disable a callback list from doing anything more. This method returns the Callbacks object onto

Call all callbacks in a list with the given context and arguments. This method returns the Callbacks

Remove all of the callbacks from a list. This method returns the Callbacks object onto which it

Determine if the callbacks list has been disabled.

Determine if the callbacks list has been locked.

Remove a callback or a collection of callbacks from a callback list. This method returns the Callbacks

Determine whether or not the list has any callbacks attached. If a callback is provided as an argument, determine whether it is in a list.

Add a callback or a collection of callbacks to a callback list. This method returns the Callbacks