Add a callback or a collection of callbacks to a callback list.

Disable a callback list from doing anything more.

Determine if the callbacks list has been disabled.

Remove all of the callbacks from a list.

Call all of the callbacks with the given arguments.

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

Call all callbacks in a list with the given context and arguments.

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.

Lock a callback list in its current state.

Determine if the callbacks list has been locked.

Remove a callback or a collection of callbacks from a callback list.

A multi-purpose callbacks list object that provides a powerful way to manage callback lists.