Represent one or more callback functions. Use the assignment operator = to set a single function to call, or the add() method to add multiple functions.
Add a function to call. When called multiple times, all added function will be called.
Clear the callback so no function will get called.
Remove the given function from the callback. Doesn't do anything if the function is not set as callback.
Represent one or more callback functions. Use the assignment operator = to set a single function to call, or the add() method to add multiple functions.