子控制器未注入主控制器

时间:2013-02-09 19:42:22

标签: controller javafx-2 code-injection fxml

我有一个BorderPane(与MainController相关联),BorderPane的FXML使用<fx:include>将Label(带有控制器StatusBarController)包含在BorderPane的底部区域。不幸的是,StatusBarController没有注入MainController类实例,我无法理解为什么。

main.fxml:包含状态栏的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:标签及其关联的控制器

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

带有StatusBarController字段的MainController:

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
    }
}

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();
    }

我的样本的完整源代码可在http://codestefan.googlecode.com/svn/trunk/SubcontrollerAccess/

获得

所以问题是:为什么StatusBarController没有注入到MainController的statusbarController变量中?

感谢任何提示!

2 个答案:

答案 0 :(得分:18)

要使用@FXML代码,您必须提供fx:id

更新main.fxml

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

之后,您可以使用MainController.java中的下一个常量:

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

请注意,statusbarController不是部分小写的类名,而是fx:id + Controller字。

答案 1 :(得分:0)

netbeans 8.0中似乎也存在嵌套fxmls的错误。不能指望netbeans为你创建嵌套的fxml的控制器对象,它必须手动插入你的MainController。每次控制器在netbeans中更新它都会被消灭,所以它可能有点乏味。对于这个插入

的例子

@FXML private StatusBarController statusbarController;

在这种情况下,

手动进入主控制器,然后它正常工作。对于组织大型fxmls /控制器非常有用。