JavaFX将值从子节点传递给父节点 [英] JavaFX pass values from child to parent

问题描述

我有一个包含一个按钮的父控制器。当我点击按钮时，它会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

I have one parent controller which contain one button. When I click on button it open new window and show some data into table. The code I have used for opening window is

            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？

It opens window properly. Now what I need is, when I double click on the row of table of the child window, It should set some value in parent controller textbox. How would we pass this value from child controller to parent controller?

推荐答案

在子控制器中公开一个属性并从父母控制者。在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：

Expose a property in your child controller and observe it from the "parent" controller. There isn't really enough information in your question to give a precise answer, but it would look something like:

public class ChildController {

    @FXML
    private TableView<Customer> customerTable ;

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

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

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

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

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

    }
}

然后你就这样做：

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();

另一种方法是使用 Consumer 作为子控制器中的回调：

An alternative approach is to use a Consumer as a callback in the child controller:

public class ChildController {

    @FXML
    private TableView<Customer> customerTable ;

    private Consumer<Customer> customerSelectCallback ;

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

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

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

    }
}

你做这个版本

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();

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