I'd like to edit a structure like this:
class Sum {
int a;
int b;
int sum; // = a + b
}
Fields a and b are edited by ValueBoxes, field sum is displayed by
ValueLabel.
The field sum=a+b. When a user modifies either a or b, I'd like the filed
sum to be modified and the editor to reflect the modification (i.e., a user
to see the change).
I thought ValueAwareEditor<Sum> would help but it does not seem to. What
would be the recommended approach wiring dependencies between fields?
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