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.*; /* 1.4 example used by DialogDemo.java. */ class CustomDialog extends JDialog implements ActionListener, PropertyChangeListener { private String typedText = null; private JTextField textField; private DialogDemo dd; private String magicWord; private JOptionPane optionPane; private String btnString1 = "Enter"; private String btnString2 = "Cancel"; /** * Returns null if the typed string was invalid; * otherwise, returns the string as the user entered it. */ public String getValidatedText() { return typedText; } /** Creates the reusable dialog. */ public CustomDialog(Frame aFrame, String aWord, DialogDemo parent) { super(aFrame, true); dd = parent; magicWord = aWord.toUpperCase(); setTitle("Quiz"); textField = new JTextField(10); //Create an array of the text and components to be displayed. String msgString1 = "What was Dr. SEUSS's real last name?"; String msgString2 = "(The answer is \"" + magicWord + "\".)"; Object[] array = {msgString1, msgString2, textField}; //Create an array specifying the number of dialog buttons //and their text. Object[] options = {btnString1, btnString2}; //Create the JOptionPane. optionPane = new JOptionPane(array, JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION, null, options, options[0]); //Make this dialog display it. setContentPane(optionPane); //Handle window closing correctly. 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)); } }); //Ensure the text field always gets the first focus. addComponentListener(new ComponentAdapter() { public void componentShown(ComponentEvent ce) { textField.requestFocusInWindow(); } }); //Register an event handler that puts the text into the option pane. textField.addActionListener(this); //Register an event handler that reacts to option pane state changes. optionPane.addPropertyChangeListener(this); } /** This method handles events for the text field. */ public void actionPerformed(ActionEvent e) { optionPane.setValue(btnString1); } /** This method reacts to state changes in the option pane. */ public void propertyChange(PropertyChangeEvent e) { String prop = e.getPropertyName(); if (isVisible() && (e.getSource() == optionPane) && (JOptionPane.VALUE_PROPERTY.equals(prop) || JOptionPane.INPUT_VALUE_PROPERTY.equals(prop))) { Object value = optionPane.getValue(); if (value == JOptionPane.UNINITIALIZED_VALUE) { //ignore reset return; } //Reset the JOptionPane's value. //If you don't do this, then if the user //presses the same button next time, no //property change event will be fired. optionPane.setValue( JOptionPane.UNINITIALIZED_VALUE); if (btnString1.equals(value)) { typedText = textField.getText(); String ucText = typedText.toUpperCase(); if (magicWord.equals(ucText)) { //we're done; clear and dismiss the dialog clearAndHide(); } 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; textField.requestFocusInWindow(); } } else { //user closed dialog or clicked cancel dd.setLabel("It's OK. " + "We won't force you to type " + magicWord + "."); typedText = null; clearAndHide(); } } } /** This method clears the dialog and hides it. */ public void clearAndHide() { textField.setText(null); setVisible(false); } }