java - 在 fxml 文件之间切换

Question

我在 swing 组件内使用 jfxPanel 创建了一个应用程序。我面临的问题是我无法更改 fxml 文件。当单击 fxml 的按钮时，我想处理该 fxml 并在那里加载另一个 fxml 文件。这就是我到目前为止所做的

public class NonResponsiveButtons extends JFrame {
    NonResponsiveButtons nrb;
    BottomPanelIncomingController bpic;
    JPanel panel; 
    JPanel bPanel;

    private int applicationWidth_600 = 600;
    private int applicationHeight_600 = 600;

    private int upperPanelHeight_535 = 535;
    private int bottomPanelHeight_65 = (applicationHeight_600-upperPanelHeight_535); 


    public static void main(String[] args) {
    new NonResponsiveButtons();
    }



    public NonResponsiveButtons(){
        final JFXPanel fxPanel = new JFXPanel();

        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
            // TODO Auto-generated method stub
                try{
                    new JFXPanel();
                    add(getJPanel(), BorderLayout.CENTER);
                    add(getJBottomPanel(), BorderLayout.PAGE_END);
                    bPanel.add(fxPanel, BorderLayout.CENTER);

                    Platform.runLater((new Runnable() {

                    @Override
                    public void run() {
                        // TODO Auto-generated method stub
                        initFX(fxPanel);    
                    }
                })) ;

            }
                catch(Exception e){
                    System.out.println("Error in swing utilities thread :" + e.getMessage());
            }

        }
    });

    this.setSize(applicationWidth_600, applicationHeight_600);
    setLocationRelativeTo(null);
    BorderLayout borderLayout = new BorderLayout();
    setLayout(borderLayout);

    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);     
    setVisible(true);
}


private void initFX(JFXPanel jfxPanel) {
    try {
        FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("fxmlDesign.fxml"));
        Parent root = (Parent) fxmlLoader.load();
        Scene scene = new Scene(root, 600, 65);
        jfxPanel.setScene(scene);

        fxmlLoader.getController();
        bpic = new BottomPanelIncomingController();
        bpic.setNonResoinsiveButtons(this);

    } catch (IOException exc) {
        exc.printStackTrace();
        System.exit(1);
    }
}

public void loadSecondFxml(){
    System.out.println("loading second fxml");
}   

private JPanel getJPanel(){
    if(panel == null){
    panel = new JPanel();
    panel.setSize(applicationWidth_600,upperPanelHeight_535);
    panel.setBackground(Color.gray);
    }
    return panel;
}

private JPanel getJBottomPanel(){
    if(bPanel == null){
        bPanel = new JPanel();
        bPanel.setSize(applicationWidth_600, bottomPanelHeight_65);
        bPanel.setBackground(new Color(8, 16, 19));
    }
    return bPanel;
}   

}

BottomPanelIncommingController 类。 fxml Controller

public class BottomPanelIncomingController implements Initializable {
 NonResponsiveButtons nrb;

    @Override
    public void initialize(URL arg0, ResourceBundle arg1) {
    // TODO Auto-generated method stub
    System.out.println("HEllo");
    }

    public void setNonResoinsiveButtons(NonResponsiveButtons nrb){
    this.nrb = nrb;
    }

    @FXML
    public void callAccepted(ActionEvent event){
    System.out.println("From controller");
    nrb.loadSecondFxml();
    }
 }

Answer 1

当您使用 FXML 时，切勿使用 new 实例化 Controller ，因为实例化 Controller 的工作是由 FXMLLoader 完成的。在实例化 Controller 时，它还会创建 FXML 中的节点实例并将它们注入(inject)到 Controller 中。

如果您没有从 FMXLLoader 获取 Controller 实例，则 Controller 内所有用 @FXML 注解的节点都将为 null。因此，您必须始终从 fxml 中获取 Controller 。

根据您的情况，您应该使用

bpic = fxmlLoader.getController();

而不是

bpic = new BottomPanelIncomingController();

更新

单击按钮即可更改 FXML

让我们考虑在单击按钮时调用以下方法

@FXML
public void callAccepted(ActionEvent event){
    System.out.println("From controller");
    nrb.loadSecondFxml();
}

您可以加载 FXML 并将其设置在场景上，然后设置到 JFXPanel

public void loadSecondFxml(){
    //Load new FXML and assign it to scene
    FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("newFXML.fxml"));
    Parent root = (Parent) fxmlLoader.load();
    Scene scene = new Scene(root, 600, 65);
    jfxPanel.setScene(scene);
} 

注意:我不确定您想在这里实现什么，请将此视为一个示例，单击按钮即可加载 FXML 并应用您的逻辑。