退出按钮不起作用

时间:2014-10-05 18:04:11

标签: java swing windowbuilder

进入GUI并试图简化一些事情。但是,我似乎只是在制作一个简单的“退出”按钮。我正在使用Eclipse的WindowsBuilder插件来帮助我。

private void initialize()
{
    mainWindowFrame = new JFrame();
    mainWindowFrame.setTitle("Lock and Log");
    mainWindowFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(MainWindow.class.getResource("/lockandlog/main/resources/icon.png")));
    mainWindowFrame.setResizable(false);
    mainWindowFrame.setBounds(100, 100, 854, 480);
    mainWindowFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    mainWindowFrame.getContentPane().setLayout(null);

    final JTextArea logDisplay = new JTextArea();
    logDisplay.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
    logDisplay.setEditable(false);
    logDisplay.setBounds(259, 11, 579, 250);
    mainWindowFrame.getContentPane().add(logDisplay);

    JLabel viewCmdDisplayLbl = new JLabel("View Command Display:");
    viewCmdDisplayLbl.setFont(new Font("Tahoma", Font.BOLD, 11));
    viewCmdDisplayLbl.setBounds(259, 272, 133, 14);
    mainWindowFrame.getContentPane().add(viewCmdDisplayLbl);

    JTextArea textArea = new JTextArea();
    textArea.setEditable(false);
    textArea.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
    textArea.setBounds(259, 297, 579, 104);
    mainWindowFrame.getContentPane().add(textArea);

    JToolBar toolBar = new JToolBar();
    toolBar.setBounds(0, 412, 848, 16);
    mainWindowFrame.getContentPane().add(toolBar);

    JPanel manualGrp = new JPanel();
    manualGrp.setBorder(new TitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, null, null));
    manualGrp.setBounds(10, 11, 239, 72);
    mainWindowFrame.getContentPane().add(manualGrp);
    manualGrp.setLayout(null);

    manualTxt = new JTextField();
    manualTxt.setBounds(10, 7, 219, 20);
    manualGrp.add(manualTxt);
    manualTxt.setColumns(10);

    JButton manualBtn = new JButton("Manual Override");
    manualBtn.setFont(new Font("Tahoma", Font.BOLD, 12));
    manualBtn.setBounds(10, 38, 219, 23);
    manualGrp.add(manualBtn);

    JMenuBar menuBar = new JMenuBar();
    mainWindowFrame.setJMenuBar(menuBar);

    final JMenu fileBtn = new JMenu("File");
    fileBtn.addMouseListener(new MouseAdapter() //This works
    {
        @Override
        public void mouseEntered(MouseEvent e)
        {
            fileBtn.setSelected(true);
        }
        @Override
        public void mouseExited(MouseEvent e)
        {
            fileBtn.setSelected(false);
        }
    });
    menuBar.add(fileBtn);

    JMenuItem exitBtn = new JMenuItem("Exit");
    //Code is definitely passing through here.
    exitBtn.addMouseListener(new MouseAdapter() //This doesn't work?
    {
        @Override
        public void mouseClicked(MouseEvent e)
        {
            logDisplay.setText("Test"); //This isn't even being called!
            System.exit(0);
        }
    });
    //Definitely adds the button so code is passing through here.
    fileBtn.add(exitBtn);
}

这就是现在的整个初始化类。但是如果你注意到底部附近我有一个退出按钮的事件,如果你点击它,程序应该关闭。除此之外,当我点击按钮时没有任何反应。在fileBtn中尝试其他类似的事件,效果很好。那么我做错了什么?

2 个答案:

答案 0 :(得分:3)

不要使用mouseListeners,请使用ActionListeners。

import java.awt.event.*;


public class SOQ3
{
   JFrame mainWindowFrame;

   public static void main(String[] args)
   {

      SOQ3 s = new SOQ3();

   }

   public SOQ3()
   {

      initialize();

   }

   private void initialize()
   {
      mainWindowFrame = new JFrame();
      mainWindowFrame.setTitle("Lock and Log");
      mainWindowFrame.setIconImage(Toolkit.getDefaultToolkit().getImage(MainWindow.class.getResource("/lockandlog/main/resources/icon.png")));
      mainWindowFrame.setResizable(false);
      mainWindowFrame.setBounds(100, 100, 854, 480);
      mainWindowFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      mainWindowFrame.getContentPane().setLayout(null);

      final JTextArea logDisplay = new JTextArea();
      logDisplay.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
      logDisplay.setEditable(false);
      logDisplay.setBounds(259, 11, 579, 250);
      mainWindowFrame.getContentPane().add(logDisplay);

      JLabel viewCmdDisplayLbl = new JLabel("View Command Display:");
      viewCmdDisplayLbl.setFont(new Font("Tahoma", Font.BOLD, 11));
      viewCmdDisplayLbl.setBounds(259, 272, 133, 14);
      mainWindowFrame.getContentPane().add(viewCmdDisplayLbl);

      JTextArea textArea = new JTextArea();
      textArea.setEditable(false);
      textArea.setBorder(new MatteBorder(1, 1, 1, 1, (Color) new Color(0, 0, 0)));
      textArea.setBounds(259, 297, 579, 104);
      mainWindowFrame.getContentPane().add(textArea);

      JToolBar toolBar = new JToolBar();
      toolBar.setBounds(0, 412, 848, 16);
      mainWindowFrame.getContentPane().add(toolBar);

      JPanel manualGrp = new JPanel();
      manualGrp.setBorder(new TitledBorder(null, "", TitledBorder.LEADING, TitledBorder.TOP, null, null));
      manualGrp.setBounds(10, 11, 239, 72);
      mainWindowFrame.getContentPane().add(manualGrp);
      manualGrp.setLayout(null);

      manualTxt = new JTextField();
      manualTxt.setBounds(10, 7, 219, 20);
      manualGrp.add(manualTxt);
      manualTxt.setColumns(10);

      JButton manualBtn = new JButton("Manual Override");
      manualBtn.setFont(new Font("Tahoma", Font.BOLD, 12));
      manualBtn.setBounds(10, 38, 219, 23);
      manualGrp.add(manualBtn);

      JMenuBar menuBar = new JMenuBar();
      mainWindowFrame.setJMenuBar(menuBar);

      final JMenu fileBtn = new JMenu("File");
      fileBtn.addMouseListener(
            new MouseAdapter() //This works
            {
               @Override
               public void mouseEntered(MouseEvent e)
               {
                  fileBtn.setSelected(true);
               }
               @Override
               public void mouseExited(MouseEvent e)
               {
                  fileBtn.setSelected(false);
               }
            });
      menuBar.add(fileBtn);

      JMenuItem exitBtn = new JMenuItem("Exit");
      //Code is definitely passing through here.
      exitBtn.addActionListener(
            new ActionListener() //This doesn't work?
            {
               @Override
               public void actionPerformed(ActionEvent e)
               {
                  logDisplay.setText("Test"); //This isn't even being called!
                  System.exit(0);
               }
            });
      //Definitely adds the button so code is passing through here.
      fileBtn.add(exitBtn);
   }

}

现在至于这背后的原因,你试图使用MouseListeners,而MouseListeners是好的,你需要获得你正在听的内容。简单地添加一个监听器现在可以做任何类似于ActionListener的事情,这也是我选择使用它的部分原因。另外,给你提示,使用ActionListeners监听由它附加的对象完成的Action,MouseListeners监听你及其所做的一切,无论它是否与你的程序有任何关系。将来,在使用听众时,请确保他们只听取您的程序绝对必要的内容。如果您不需要知道鼠标的位置,请不要遵循它。

答案 1 :(得分:0)

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

通常这是捕获退出事件的方式。

要使用自定义退出按钮,而不是MouseListener,请尝试使用简单的ActionListener

然后将捕获该按钮上的任何事件,并正常退出您的代码。