Bidirectional binding in JavaFX

In the next version of the JavaFX interpreter, Chris Oliver introduces a genious concept he calls bidirectional binding.

In short it means that you can now bind a value, Y, to a function of another value, X. When you change the value of X, Y changes automatically - this is ordinary binding.

The magic happens if you change the value of Y. Then JavaFX performs a reverse calculation, to rectify the value of X!!

A small example from Chris's blog:

// arithmetic
 var x = 10;
 var y = bind -x + 100;
 assert y == 90;
 y = 40;
 assert x == 60; // passes
 
 

Chris' blog post also contains an example for logical negation, as well as for sequence elements.

technorati tags:javafx, interpreter, chris oliver, bidirectional binding