内部帧监听器不工作

Question

下面的代码显示了Gui类的内部框架侦听器。内部帧监听器应该将save (JMenuItem)设置为启用或禁用，但它什么也不做。我不知道问题出在哪里。我试过很多方法，但都没用。

代码如下:

public class Gui implements InternalFrameListener, ActionListener{
MyInternalFrame frame;
JMenuItem save;
public Gui( JDesktopPane desktop, final JMenuItem save) {
    // TODO Auto-generated constructor stub
    frame = new MyInternalFrame(title, img);
     this.save = save;
    frame.setVisible(true); 
    desktop.add(frame);
    try {
            frame.setSelected(true);
    } catch (java.beans.PropertyVetoException e) {
    }
   frame.addInternalFrameListener(this);  
       // options(name, desktop);
}
class MyInternalFrame extends JInternalFrame {
    static final int xPosition = 30, yPosition = 30;
    public MyInternalFrame(String title, ImagePlus img) {
        super(title, true,true, true, true);
        setSize(img.getHeight(), img.getWidth());
        // Set the window's location.
        setLocation(xPosition * openFrameCount, yPosition * openFrameCount);
    }
}
public void actionPerformed(ActionEvent e){
    frame.addInternalFrameListener(this);
    System.out.println("beingg called");
}

@Override
public void internalFrameActivated(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(true);
}
@Override
public void internalFrameClosed(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(false);
}
@Override
public void internalFrameClosing(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(false);
}
@Override
public void internalFrameDeactivated(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(false);
}
@Override
public void internalFrameDeiconified(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(true);
}
@Override
public void internalFrameIconified(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(false);
}
@Override
public void internalFrameOpened(InternalFrameEvent arg0) {
    // TODO Auto-generated method stub
    save.setEnabled(true);
}
 }

Answer 1

显示此操作正常工作的MCVE。我的猜测是，您正在使用save菜单项的错误实例。如果有疑问，添加调试输出

    @Override
    public void internalFrameIconified(InternalFrameEvent arg0)
    {
        System.out.println("Disabling "+save);
        save.setEnabled(false);
    }

到你的方法。

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;
import javax.swing.event.InternalFrameEvent;
import javax.swing.event.InternalFrameListener;
public class InternalFrameListenerTest
{
    public static void main(String[] args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            @Override
            public void run()
            {
                createAndShowGUI();
            }
        });
    }
    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(new GridLayout(1, 1));
        JMenuBar menubar = new JMenuBar();
        JMenu menu = new JMenu("Menu");
        menubar.add(menu);
        JMenuItem menuItem = new JMenuItem("Save");
        menu.add(menuItem);
        frame.setJMenuBar(menubar);
        JDesktopPane d = new JDesktopPane();
        Gui gui = new Gui(d, menuItem);
        frame.getContentPane().add(d);
        frame.setSize(500,500);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}
class Gui implements InternalFrameListener, ActionListener
{
    MyInternalFrame frame;
    JMenuItem save;
    public Gui(JDesktopPane desktop, final JMenuItem save)
    {
        frame = new MyInternalFrame("Title");
        this.save = save;
        frame.setVisible(true);
        desktop.add(frame);
        try
        {
            frame.setSelected(true);
        }
        catch (java.beans.PropertyVetoException e)
        {
        }
        frame.addInternalFrameListener(this);
    }
    class MyInternalFrame extends JInternalFrame
    {
        static final int xPosition = 30, yPosition = 30;
        public MyInternalFrame(String title)
        {
            super(title, true, true, true, true);
            setSize(200,100);
            setLocation(50,50);
        }
    }
    public void actionPerformed(ActionEvent e)
    {
        frame.addInternalFrameListener(this);
        System.out.println("beingg called");
    }
    @Override
    public void internalFrameActivated(InternalFrameEvent arg0)
    {
        save.setEnabled(true);
    }
    @Override
    public void internalFrameClosed(InternalFrameEvent arg0)
    {
        save.setEnabled(false);
    }
    @Override
    public void internalFrameClosing(InternalFrameEvent arg0)
    {
        save.setEnabled(false);
    }
    @Override
    public void internalFrameDeactivated(InternalFrameEvent arg0)
    {
        save.setEnabled(false);
    }
    @Override
    public void internalFrameDeiconified(InternalFrameEvent arg0)
    {
        save.setEnabled(true);
    }
    @Override
    public void internalFrameIconified(InternalFrameEvent arg0)
    {
        save.setEnabled(false);
    }
    @Override
    public void internalFrameOpened(InternalFrameEvent arg0)
    {
        save.setEnabled(true);
    }
}