java - 如何绑定(bind)到 JavaFX 中的常量？

Question

如何在 JavaFX 中绑定(bind)常量？

我找到了一个方法

myObject.myIntegerProperty().bind(new IntegerBinding() {
   @Override
   protected int computeValue() {
      return 2;
   }
});

但是看起来太过分了。

有没有短路的方法？

Answer 1

作为James_D pointed out :无需创建常量绑定(bind)，只需使用给定值初始化属性即可。但是，我建议使用 ReadOnlyIntegerProperty确保该属性未在其他地方被修改:

public final class MyClass {

    private final ReadOnlyIntegerWrapper myInteger = new ReadOnlyIntegerWrapper(2);

    public int getMyInteger() {
        return myInteger.get();
    }

    public ReadOnlyIntegerProperty myIntegerProperty() {
        return myInteger.getReadOnlyProperty();
    }

}

注意类应该是final according to Jonathan Giles :

Jeff Frieson has an article about read-only properties in JavaFX. The article lacks a little clarity, so I was a little reticent to include it. The biggest issue is the fact that the methods are not final (although the class is, but I worry people won’t notice this). The methods not being final provides a huge issue if subclasses try to override the getter / setter methods and include logic (because then there are two code paths – setting via the setter and setting via the property method – and they do not overlap, resulting in unexpected behaviour at runtime. The standard rule applies – when creating getter / setter / property methods, always make them final.