通过敲击键盘上的“ enter”关闭JDialog

Question

I want to close my JDialog by hitting the "enter" key on my keyboard. how can I do that? thank you! NOTE: I want to do this, without any button involved. THank you!

Answer 1

One way:

• You could give it a close JButton
• whose ActionListener has code that closes the dialog,
• And make that button the default button for the dialog's rootpane.

---

eg,

myDialog.getRootPane().setDefaultButton(exitButton);

---

Option two:

• Use Key Bindings to bind the enter key to exit code in an AbstractAction.

eg,

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;

import javax.swing.*;

public class DemoDialog {
   public static void main(String[] args) {
      JFrame frame = new JFrame("Frame");
      frame.add(Box.createRigidArea(new Dimension(400, 300)));
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);

      final JDialog dialog = new JDialog(frame, "Dialog", true);

      // set binding
      int condition = JPanel.WHEN_IN_FOCUSED_WINDOW;
      InputMap inputMap = ((JPanel) dialog.getContentPane()).getInputMap(condition);
      ActionMap actionMap = ((JPanel) dialog.getContentPane()).getActionMap();
      String enter = "enter";
      inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0), enter);
      actionMap.put(enter, new AbstractAction() {

         @Override
         public void actionPerformed(ActionEvent e) {
            dialog.dispose();
         }
      });

      dialog.add(Box.createRigidArea(new Dimension(200, 200)));
      dialog.pack();
      dialog.setLocationRelativeTo(frame);
      dialog.setVisible(true);

   }
}

Answer 2

I would like to say first that 'Hovercraft Full Of Eels' solution is more elegant than this one and more closely in the spirit of the JDialog and Swing API. However, to offer an alternative here is a basic example of using a KeyListener on your JDialog that will do as you need without adding a button;

public class Test {

public static void main(String[] args) {
    JDialog jd = new JDialog();

    // Add and define the KeyListener here!
    jd.addKeyListener(new KeyListener(){  

        @Override
        public void keyTyped(KeyEvent e) {
            // Nothing
        }

        @Override
        public void keyPressed(KeyEvent e) {
            // Nothing 
        }

        @Override
        public void keyReleased(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_ENTER){
                JDialog d = (JDialog)e.getSource();
                d.dispose();
                }
            }
        });        
    // End key listener code
        jd.setVisible(true);
    }
}

The important/relevant code is between the two main comments. This is a compilable example, so you can copy paste this into a new file and run it to view the effects.