如何在tableView JavaFx中检测数据更改

Question

public class Car{
private SimpleIntegerProperty id = new SimpleIntegerProperty();
private SimpleStringProperty brand = new SimpleStringProperty();
private SimpleStringProperty engine = new SimpleStringProperty();
private SimpleBooleanProperty navi = new SimpleBooleanProperty();
private SimpleBooleanProperty available = new SimpleBooleanProperty();
private SimpleDoubleProperty liters = new SimpleDoubleProperty();
private SimpleIntegerProperty power = new SimpleIntegerProperty();

(...)
}

class MainController
{

@FXML
public void initialize()
{

    idColumn.setCellValueFactory(new PropertyValueFactory<Car, Integer>("id"));
    engineColumn.setCellValueFactory(new PropertyValueFactory<Car, String>("engine"));
    brandColumn.setCellValueFactory(new PropertyValueFactory<Car, String>("brand"));
    naviColumn.setCellValueFactory(new PropertyValueFactory<Car, Boolean>("navi"));
    availableColumn.setCellValueFactory(new PropertyValueFactory<Car, Boolean>("available"));
    powerColumn.setCellValueFactory(new PropertyValueFactory<Car, Integer>("power"));
    fuelColumn.setCellValueFactory(new PropertyValueFactory<Car, Double>("liters"));
    carModel.getObservableList().add(new Car(213,"FIAT","1.9 JTD",true,true,32.4,132));
    tableView.setItems(carModel.getObservableList());
 }

carModel.getObservableList().addListener((Change<? extends Car> c) -> {
         while (c.next()) {
             if (c.wasAdded()) {
                 System.out.println("Added:");
                 c.getAddedSubList().forEach(System.out::println);
                 System.out.println();
             }
             if (c.wasRemoved()) {
                 System.out.println("Removed:");
                 c.getRemoved().forEach(System.out::println);
                 System.out.println();
             }
             if (c.wasUpdated()) {
                 System.out.println("Updated:");
                 carModel.getObservableList().subList(c.getFrom(), c.getTo()).forEach(System.out::println);
                 System.out.println();
             }
         }
      });

我在论坛上发现了这样的sollution，正如我所说的，它只检测添加/删除对象

Answer 1

如果只需要更改一个属性的事实，最简单的方法是将所有属性连接到一个ObservableValue中。

在CAR类中，请使用以下方法：

ObservableValue changeProperty() {
    return Bindings.concat(id, brand, engine, navi, available, liters, power);
}

在客户端，您只需收听：

    car.changeProperty().addListener(new ChangeListener() {
        @Override
        void changed(ObservableValue observable, Object oldValue, Object newValue) {
            // one of property was changed, do something
        }
    })

ObservableValue changeProperty() {
    return Bindings.concat(car1.changeProperty(), car2.changeProperty(), carN.changeProperty());
}