JavaFX将值从子级传递给父级

我有一个父控制器,其中包含一个按钮.当我点击按钮时,它打开新窗口并将一些数据显示在表格中.我用于打开窗口的代码是

            Stage stage = new Stage();
            FXMLLoader fxmlLoader = new FXMLLoader(
                    getClass().getResource("../layout/SearchCustomer.fxml"));
            Parent parent = (Parent) fxmlLoader.load();
            Scene scene = new Scene(parent);
            stage.initModality(Modality.APPLICATION_MODAL);
            stage.initOwner(parent.getScene().getWindow());
            stage.setScene(scene);
            stage.resizableProperty().setValue(false);
            stage.showAndWait();

它正确打开窗口.现在我需要的是,当我双击子窗口的表行时,它应该在父控制器文本框中设置一些值.我们如何将这个值从子控制器传递给父控制器？

在子控制器中公开属性,并从"父"控制器中观察它.你的问题中没有足够的信息来给出准确的答案,但它看起来像是:

public class ChildController {

    @FXML
    private TableView customerTable ;

    private final ReadOnlyObjectWrapper currentCustomer = new ReadOnlyObjectWrapper<>();

    public ReadOnlyObjectProperty currentCustomerProperty() {
        return currentCustomer.getReadOnlyProperty() ;
    }

    public Customer getCurrentCustomer() {
        return currentCustomer.get();
    }

    public void initialize() {
        // set up double click on table:

        customerTable.setRowFactory(tv -> {
            TableRow row = new TableRow<>();
            row.setOnMouseClicked(e -> {
                if (row.getClickCount() == 2 && ! row.isEmpty()) {
                    currentCustomer.set(row.getItem());
                }
            }
        });

    }
}

然后你就是这样做的:

Stage stage = new Stage();
FXMLLoader fxmlLoader = new FXMLLoader(
        getClass().getResource("../layout/SearchCustomer.fxml"));
Parent parent = (Parent) fxmlLoader.load();

ChildController childController = fxmlLoader.getController();
childController.currentCustomerProperty().addListener((obs, oldCustomer, newCustomer) -> {
    // do whatever you need with newCustomer....
});

Scene scene = new Scene(parent);
stage.initModality(Modality.APPLICATION_MODAL);
stage.initOwner(parent.getScene().getWindow());
stage.setScene(scene);
stage.resizableProperty().setValue(false);
stage.showAndWait();

另一种方法是Consumer在子控制器中使用a 作为回调:

public class ChildController {

    @FXML
    private TableView customerTable ;

    private Consumer customerSelectCallback ;

    public void setCustomerSelectCallback(Consumer callback) {
        this.customerSelectCallback = callback ;
    }

    public void initialize() {
        // set up double click on table:

        customerTable.setRowFactory(tv -> {
            TableRow row = new TableRow<>();
            row.setOnMouseClicked(e -> {
                if (row.getClickCount() == 2 && ! row.isEmpty()) {
                    if (customerSelectCallback != null) {
                        customerSelectCallback.accept(row.getItem());
                    }
                }
            }
        });

    }
}

在这个版本中你做到了

Stage stage = new Stage();
FXMLLoader fxmlLoader = new FXMLLoader(
        getClass().getResource("../layout/SearchCustomer.fxml"));
Parent parent = (Parent) fxmlLoader.load();

ChildController childController = fxmlLoader.getController();
childController.setCustomerSelectCallback(customer -> {
    // do whatever you need with customer....
});

Scene scene = new Scene(parent);
stage.initModality(Modality.APPLICATION_MODAL);
stage.initOwner(parent.getScene().getWindow());
stage.setScene(scene);
stage.resizableProperty().setValue(false);
stage.showAndWait();