import javax.swing.JOptionPane;
import javax.swing.JDialog;
import javax.swing.JTextField;
import java.beans.*; //Property change stuff
import java.awt.*;
import java.awt.event.*;

class CustomDialog extends JDialog {
    private String typedText = null;

    private String magicWord;
    private JOptionPane optionPane;

    public String getValidatedText() {
	return typedText;
    }

    public CustomDialog(Frame aFrame, String aWord, DialogDemo parent) {
	super(aFrame, true);
	final DialogDemo dd = parent;

	magicWord = aWord.toUpperCase();
	setTitle("Quiz");

	final String msgString1 = "What was Dr. SEUSS's real last name?";
	final String msgString2 = "(The answer is \"" + magicWord
				  + "\".)";
	final JTextField textField = new JTextField(10);
	Object[] array = {msgString1, msgString2, textField};

	final String btnString1 = "Enter";
	final String btnString2 = "Cancel";
	Object[] options = {btnString1, btnString2};

	optionPane = new JOptionPane(array, 
				    JOptionPane.QUESTION_MESSAGE,
				    JOptionPane.YES_NO_OPTION,
				    null,
				    options,
				    options[0]);
	setContentPane(optionPane);
	setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
	addWindowListener(new WindowAdapter() {
		public void windowClosing(WindowEvent we) {
		/*
		 * Instead of directly closing the window,
		 * we're going to change the JOptionPane's
		 * value property.
		 */
		    optionPane.setValue(new Integer(
					JOptionPane.CLOSED_OPTION));
	    }
	});

	textField.addActionListener(new ActionListener() {
	    public void actionPerformed(ActionEvent e) {
		optionPane.setValue(btnString1);
	    }
	});

	optionPane.addPropertyChangeListener(new PropertyChangeListener() {
	    public void propertyChange(PropertyChangeEvent e) {
		String prop = e.getPropertyName();

		if (isVisible() 
		 && (e.getSource() == optionPane)
		 && (prop.equals(JOptionPane.VALUE_PROPERTY) ||
		     prop.equals(JOptionPane.INPUT_VALUE_PROPERTY))) {
		    Object value = optionPane.getValue();

		    if (value == JOptionPane.UNINITIALIZED_VALUE) {
			//ignore reset
			return;
		    }

		    if (value.equals(btnString1)) {
			    typedText = textField.getText();
			String ucText = typedText.toUpperCase();
			if (ucText.equals(magicWord)) {
			    // we're done; dismiss the dialog
			    setVisible(false);
			} else { 
			    // text was invalid
			    textField.selectAll();
			    JOptionPane.showMessageDialog(
					    CustomDialog.this,
					    "Sorry, \"" + typedText + "\" "
					    + "isn't a valid response.\n"
					    + "Please enter " 
					    + magicWord + ".",
					    "Try again",
					    JOptionPane.ERROR_MESSAGE);
			    typedText = null;
			    // reset the JOptionPane's value
			    optionPane.setValue(
				    JOptionPane.UNINITIALIZED_VALUE);
			}
		    } else { // user closed dialog or clicked cancel
			dd.setLabel("It's OK.  "
				 + "We won't force you to type "
				 + magicWord + ".");
			setVisible(false);
		    }
		}
	    }
	});
    }
}