双向绑定到属性否定 [英] Bidirectionally bind to property negation

问题描述

给定

DoubleProperty A;
DoubleProperty minusA;

有没有办法双向绑定他们的否定对方，所以A.get（）= = -minusA.get（），两者都可以是 set（）？

is there a way to bind their negations bidirectionally to each other, so that A.get() == -minusA.get() at all times, and both can be set()?

推荐答案

我尝试过，但没有找到一种使用双向绑定的方法，但也可能在两者上都可以使用InvalidationListner？

I tried but did´t find a way by using a bidirectional binding but maybe you could use an InvalidationListner on both?

p>

Something like

A.addListener((Observable observable) -> {
        System.out.println("A is invalid");
        minusA.set(A.get() *-1);
    });

minusA.addListener((Observable observable) -> {
        System.out.println("minusA is invalid");
        A.set(minusA.get() * -1);
    });

那么你可以很容易地调用这两个DoubleProperties的setter方法，另一个值将改变为negativ值

then you could easily call the setter method of both DoubleProperties and the other value will change to the negativ value.

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