Base class that provides most of the functionality needed to implement a
Binding of a
StringBinding provides a simple invalidation-scheme. An extending
class can register dependencies by calling
If One of the registered dependencies becomes invalid, this
StringBinding is marked as invalid. With
unbind(Observable...) listening to dependencies can be stopped.
To provide a concrete implementation of this class, the method
computeValue() has to be implemented to calculate the value of this
binding based on the current state of the dependencies. It is called when
get() is called for an invalid binding.
DoubleBinding for an example how this base class can be extended.