JavaFX：如何使包含其他可观察对象列表的可观察对象无效

Question

public class ObservedContainer implements Observable {
  ArrayList<AnotherObservableClass> someOtherClasses;
  (...observable implementation omitted for brevity)
}

public class ObservedContainer implements Observable {
  ArrayList<AnotherObservableClass> someOtherClasses = new ArrayList<>();
  (...observable implementation omitted for brevity)

  public void addAnotherObservableClass(AnotherObservableClass a){
    someOtherClasses.add(a);
    fireInvalidationEvent();
    // This just notifies all listeners that the object has changed
  }

  public void removeAnotherObservableClass(AnotherObservableClass a){
    someOtherClasses.remove(a);
    fireInvalidationEvent();
  }  
}

Answer 1

有一个类应该为您处理这个问题:ObservableList

FxCollections.ObservabLearrayList方法可用于在列表中元素的属性修改时触发更新更改。

ObservableList<Node> list = FXCollections.observableArrayList(node -> new Observable[] { node.translateXProperty() });

如果列表元素之一的TranslateX属性被修改，则会触发侦听器。

list.addListener((Observable o) -> fireInvalidationEvent());