使用 JavaFX 中的 TableView 列绑定两个类属性

Question

我有以下课程：

public class Person {
    private final StringProperty firstName;
    private final StringProperty lastName;

    public String getFirstName() {
        return firstName.get();
    }

    public void setFirstName(String firstName) {
        this.firstName.set(firstName);
    }

    public StringProperty firstNameProperty() {
        return firstName;
    }

    public String getLastName() {
        return lastName.get();
    }

    public void setLastName(String lastName) {
        this.lastName.set(lastName);
    }

    public StringProperty lastNameProperty() {
        return lastName;
    }

    public StringProperty getName() {
        return new SimpleStringProperty(firstName.get() + " " + lastName.get()); 
    }
}

然后我有一个 TableView，我在其中在一列中显示两个名称：

@FXML
private TableView<Person> personTable;
@FXML
private TableColumn<Person, String> name;

@FXML
private void initialize() {
    name.setCellValueFactory(cellData -> cellData.getValue().getName());

    personTable.getSelectionModel().selectedItemProperty().addListener(
            (observable, oldVal, newVal) -> showDetails(newVal));
}

现在我可以对我的 Person 对象进行更改，但它们没有显示在 TableView 列中。当我再次打开编辑窗口时，我看到了新值，但在我的 TableView 中我看到了旧值。我该怎么办？

Answer 1

做

public class Person {

    private final ReadOnlyStringWrapper name = new ReadOnlyStringWrapper();

    private final StringProperty firstName = new SimpleStringProperty();
    private final StringProperty lastName = new SimpleStringProperty();

    public Person() {

        name.bind(Bindings.concat(firstName, " ", lastName));
        // existing code...
    }

    // existing code...

    public ReadOnlyStringProperty nameProperty() {
        return name.getReadOnlyProperty();
    }

    public final String getName() {
        return name.get();
    }
}

然后你可以做

@FXML
private TableColumn<Person, String> name;

@FXML
private void initialize() {
    name.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
}

或者，您可以从Person类中完全省略全名，而只需在单元格值工厂中需要的位置创建绑定：

name.setCellValueFactory(cellData -> Bindings.concat(
    cellData.getValue().firstNameProperty(),
    " ",
    cellData.getValue().lastNameProperty()));