JavaFX从FXML子访问父控制器类

本文介绍了JavaFX从FXML子访问父控制器类的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

使用JavaFX作为应用程序，我有一个Main.fxml文件，里面有一些fxml子文件。

using JavaFX for an application and I have a Main.fxml file with some fxml child files inside it.

我想访问Main的MainController类。来自子控制器的fxml。

I would like to access to MainController class of Main.fxml from the child Controllers.

我将尝试用一个例子更好地解释：

I'll try to explain better with an example:

MainFxml：

<HBox fx:controller="MainController.java"> <fx:include source="child.fxml"/> </HBox>

MainController：

MainController:

public class MainController implements Initializable { private String string; public void setString (String string) { this.string = string; }

ChildFxml：

ChildFxml:

<HBox fx:id="child" fx:controller="ChildController.java"> <Button text="hello" onAction="#selectButton"></Button> </HBox>

ChildController：

ChildController:

public class ChildController implements Initializable { @FXML HBox child; @FXML Button button; @FXML public void selectButton (ActionEvent event) { // here call MainController.setString("hello"); }

我试过在StackOverflow上找到此解决方案但我需要获取已加载的Main.fxml的Controller引用。 是否有任何方法可以从特定窗格启动Controller？ 类似于：

I tried this solution found on StackOverflow but I need to get the Controller reference of the Main.fxml that has been already loaded. Is there any method to get the Controller starting from a specific Pane? Something like:

// child.getParent().getController();

推荐答案

如果您指定 fx ：id 到< fx：include> 标记， FXMLLoader 尝试注入包含fxml的控制器到名为< fx：id> Controller 的字段。您可以在初始化方法中将 MainController 引用传递给子控制器：

If you assign a fx:id to the <fx:include> tag, FXMLLoader tries to inject the the controller of the included fxml to a field named <fx:id>Controller. You can pass the MainController reference to the child controllers in the initialize method:

<HBox fx:controller="MainController.java"> <fx:include fx:id="child" source="child.fxml"/> </HBox>

MainController

MainController

@FXML private ChildController childController; @Override public void initialize(URL url, ResourceBundle rb) { childController.setParentController(this); }

ChildController

ChildController

private MainController parentController; public void setParentController(MainController parentController) { this.parentController = parentController; } @FXML private void selectButton (ActionEvent event) { this.parentController.setString("hello"); }

然而会更好练习保持 ChildController 独立于父级。这可以通过在 ChildController 中提供 StringProperty 来完成，该值设置为父应显示的值。

It would however be better practice to keep the ChildController independent from the parent. This could be done by providing a StringProperty in the ChildController that gets set to the value the parent should display.

private final StringProperty value = new SimpleStringProperty(); public StringProperty valueProperty() { return value; } @FXML private void selectButton (ActionEvent event) { value.set("hello"); }

ParentController

ParentController

@Override public void initialize(URL url, ResourceBundle rb) { childController.valueProperty().addListener((observable, oldValue, newValue) -> setString(newValue)); }