Esc key event for disposing JDialogs.

[Neha D]

Hi All,

I wanna implement the Escape key event for all the dialog boxes in my applet. I have given the key event listener on all the dialogs wherein if the key code is VK_ESCAPE then I dispose that particular dialog.

This works fine for some dialogs, also fine for dialogs which have text fields & text areas on it & these components having the focus. But the problem is for dialogs having JTables on it. If the focus is on the table then esc key doesnt work for the dialog. Even for the combo boxes as conbo boxes do not have key event handlers.

But I need to fix this problem for dialogs containing tables.

Can anyone plz suggest me a solution for this problem.

All help is appreciated.

Thanx.

Neha.....

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class KeyBindingTest
{
    JDialog dialog;
 
    public KeyBindingTest()
    {
        JFrame f = new JFrame();
        createDialog(f);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(getUIPanel(), "North");
        f.setSize(200,100);
        f.setLocation(200,200);
        f.setVisible(true);
    }
 
    private void createDialog(Frame f)
    {
        dialog = new JDialog(f, "test", false);
        JPanel panel = new JPanel();
        panel.add(new JButton("button"));
        dialog.getContentPane().add(panel, "North");
        dialog.getContentPane().add(getTable());
        panel = new JPanel();
        panel.add(new JTextField(18));
        dialog.getContentPane().add(panel, "South");
        dialog.pack();
        dialog.setLocation(425,200);
        bindUsableComponents(dialog.getContentPane());
    }
 
    private void showDialog()
    {
        dialog.setVisible(true);
    }
 
    private JTable getTable()
    {
        int rows = 4, cols = 3;
        String[] headers = { "column 1", "column 2", "column 3" };
        Object[][] data = new Object[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                data[row][col] = "item " + (row * cols + col + 1);
        return new JTable(data, headers);
    }
 
    private void bindUsableComponents(Container container)
    {
        Component[] c = container.getComponents();
        for(int j = 0; j < c.length; j++)
        {
            // isfocusable is new in j2se 1.4, may be ok without it
            if(c[j] instanceof JComponent && c[j].isFocusable() &&
                !(c[j] instanceof JPanel))
            {
                System.out.println(c[j].getClass().getName());
                addKeyBinding((JComponent)c[j]);
            }
            if(((Container)c[j]).getComponentCount() > 0)
                bindUsableComponents((Container)c[j]);
        }
    }
 
    private void addKeyBinding(JComponent c)
    {
        Object name = escape.getValue(Action.NAME);
        c.getInputMap().put(KeyStroke.getKeyStroke("ESCAPE"), name);
        c.getActionMap().put(name, escape);
    }
 
    private Action escape = new AbstractAction()
    {
        { putValue(NAME, "escape"); }
 
        public void actionPerformed(ActionEvent e)
        {
            JComponent source = (JComponent)e.getSource();
            Window window = SwingUtilities.getWindowAncestor(source);
            window.dispose();
            //Dialog dialog = (Dialog)source.getFocusCycleRootAncestor();
            //dialog.dispose();
            //System.out.println("source = " + source.getClass().getName() + "\n" +
            //                   "source.focusCycleRootAncestor = " +
            //           source.getFocusCycleRootAncestor().getClass().getName());
        }
    };
 
    private JPanel getUIPanel()
    {
        JButton launch = new JButton("launch dialog");
        launch.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                showDialog();
            }
        });
        JPanel panel = new JPanel();
        panel.add(launch);
        return panel;
    }
 
    public static void main(String[] args)
    {
        new KeyBindingTest();
    }
}

[Brian Dienes]

Thanks.

Great job on this code.

This has solved my ESC key question for JDialog.

Thanks again!!