controller - 子 Controller 未注入(inject)主 Controller

我有一个BorderPane(与MainController关联)，用于BorderPane的FXML使用<fx:include>将Label(带有 Controller StatusBarController)包括到BorderPane的底部区域中。不幸的是，StatusBarController没有注入(inject)到MainController类实例中，我不明白为什么。

main.fxml:具有状态栏的BorderPane

<fx:root type="javafx.scene.layout.BorderPane" fx:id="borderPane" xmlns:fx="http://javafx.com/fxml" fx:controller="com.example.controllers.MainController">
  <bottom>
    <fx:include source="statusbar.fxml" />
  </bottom>
</fx:root>

statusbar.fxml:Label及其关联的 Controller

<Label fx:id="statusbar" text="A label simulating a status bar" xmlns:fx="http://javafx.com/fxml" fx:controller="com.example.controllers.StatusBarController" />

MainController带有StatusBarController的字段:

public class MainController
{
    @FXML
    private StatusBarController statusbarController; // PROBLEM HERE: I would expect the StatusBarController to be injected but this does not happen!


    // Implementing Initializable Interface no longer required on JavaFX 2.2 according to
    // http://docs.oracle.com/javafx/2/fxml_get_started/whats_new2.htm
    // (I also tested this, the initialize() method is being called)
    @SuppressWarnings("unused") // only called by the FXMLLoader
    @FXML // This method is called by the FXMLLoader when initialization is complete
    private void initialize() {
        // initialize your logic here: all @FXML variables will have been injected
        assert borderPane != null : "fx:id=\"borderPane\" was not injected: check your FXML file 'main.fxml'.";
        System.out.println("MainController initialize()");

        //statusbarController.setStatusText("Hello from MainController"); // PROBLEM HERE: this fails because statusbarController is not injected as expected
    }
}

以及应用程序的开始:

public void start(Stage primaryStage)
    {
        Parent root = null;

        try {
            root = FXMLLoader.load(getClass().getResource("/resources/main.fxml"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        primaryStage.setTitle("Demo");
        primaryStage.setScene(new Scene(root, 800, 600));
        primaryStage.show();
    }

我的示例的完整源代码可在http://codestefan.googlecode.com/svn/trunk/SubcontrollerAccess/上找到。

所以问题是:为什么不将StatusBarController注入(inject)MainController的statusbarController变量中？

感谢您的提示!

最佳答案

要使用@FXML标记，您必须提供fx:id。

更新您的main.fxml:

<bottom>
    <fx:include fx:id="statusbar" source="statusbar.fxml" />
</bottom>

之后，您可以在MainController.java中使用下一个常量:

@FXML
Label statusbar; // node itself
@FXML
private StatusBarController statusbarController; // controller

请注意，statusbarController不是偏小写的类名，而是fx:id + Controller字。

关于controller - 子 Controller 未注入(inject)主 Controller ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/14790785/