java - 从外部向位于 EventDispath 线程中的 JFrame 添加附加面板？

Question

我在 EventDispatch 线程中创建一个新框架，并希望稍后向其中添加新面板。但我得到的只是一个空白框，高度为 0。但会显示从内部类内部添加的面板。如何使用 showFirstFrame() 添加？ 遇到这个问题后我不得不遵循这样的方法:All the Swing frames get "frozen" when wait() is called in Java

我一直在引用这个教程:http://leepoint.net/JavaBasics/gui/gui-commentary/guicom-main-thread.html

提前致谢。

public class GUIController {
    JFrame bf;
    JFrame tempFrame;

    public JFrame showFrame(){
        SwingUtilities.invokeLater(new Runnable() {
                    public void run() {
                            try {
                                Class c;
                                Constructor ctr;
                                c = Class.forName("SomeJFrame");
                                ctr = c.getConstructor();
                                GUIController.this.bf.removeAll();
                                GUIController.this.bf = (BaseFrame) ctr.newInstance();
                                GUIController.this.bf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                                GUIController.this.bf.pack();
                                GUIController.this.bf.setVisible(true);

                        } catch (InstantiationException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (IllegalAccessException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (IllegalArgumentException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (InvocationTargetException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (NoSuchMethodException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (SecurityException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        } catch (ClassNotFoundException ex) {
                            Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                        }

                }
            });

  return  GUIController.this.bf;
}


public void showFirstFrame(){
         tempFrame = showFrame();
        tempFrame .getContentPane().add(headerPanel, BorderLayout.PAGE_START);
           tempFrame .getContentPane().add(new EnterSomePanel(), BorderLayout.CENTER);
           tempFrame .getContentPane().add(footerPanel, BorderLayout.PAGE_END);
            tempFrame .setVisible(true);

    }
}

编辑:

...

class GUIController {


    HeaderPanel headerPanel = new HeaderPanel(); // extends JPanel
    FooterPanel footerPanel = new FooterPanel();
    BaseFrame bf = new BaseFrame(); // extends JFrame

    public BaseFrame showFrame(String frameName){


         try {
                        Class c;
                        Constructor ctr;
                        c = Class.forName("some.dynamically.loaded.JFrame" + frameName);
                        ctr = c.getConstructor();
                        bf = (BaseFrame) ctr.newInstance();
                        bf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                        bf.pack();
                        bf.setVisible(true);

                    } catch (InstantiationException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (IllegalAccessException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (IllegalArgumentException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (InvocationTargetException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (NoSuchMethodException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (SecurityException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    } catch (ClassNotFoundException ex) {
                        Logger.getLogger(GUIController.class.getName()).log(Level.SEVERE, null, ex);
                    }

        return bf;

    }


    public void showFirstFrame(final String frame){ //some controller will pass a frame name to this

        bf =  showFrame(frame);

        SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    bf.getContentPane().add(headerPanel, BorderLayout.PAGE_START);
                    bf.invalidate();
                    bf.validate();
                    System.out.println("test");
                }
         });


    }
}

class Main{
    public static void main(String args[]){
        GUIController c = new GUIController();
        c.showFirstFrame("FirstFrame");
    }
}

Answer 1

如果您只想在两个之间切换，请不要以这种方式重新创建 GUI JPanels里面JFrame那么你有两个非常简单的选择

1) JFrame 默认有 BorderLayout ，如果您将 JPanel (add.myPanel;) 放在那里，那么这个 JPanel 将被放置到 CENTER 区域并且占据了整个JFrame，并且在BorderLayout中只能将一个JComponent放置到具体区域，那么你将只调用(不删除，任何原因)

myFatherPanel.add(myPanel, BorderLayout.PAGE_START);
revalidate();
repaint();

2) 最重要的是使用 CardLayout 来放置您的 GUI ，那么您就可以忘记 GUI 的所有问题了

3) 更安全的方法是放置(到 JFrame)FatherPanel(从未被删除)并从此 FatherPanel 删除 JComponents >，因为如果您调用 JFrame#removeAll()，那么您就删除了 RootPane，并且 JFrame 中仅保留 Borders 与您描述的相同