public class VarEvent extends Object
If a listener needs to know the new value, it should query the Var directly. If a listener needs to know the old value as well, the listener itself must keep track of the value the Var had the last time that listener was fired. This may be different for different listeners, especially in a situation with nested modification.
Some helper functions, especially for listeners needing to know the Var's old
value, can be found in
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