bsconfcountdowndialog.java

一款即时通讯软件

package edu.ou.kmi.buddyspace.plugins.conference.gui;

/*
 * BSConfCountdownDialog.java
 *
 *
 * Project: BuddySpace
 * (C) Copyright Knowledge Media Institute 2002
 *
 *
 * Created on 28 October 2002, 13:35
 */

import java.awt.*;
import javax.swing.*;
import java.beans.*; // Property change stuff
import java.util.*;

import org.jabber.jabberbeans.*;
import org.jabber.jabberbeans.util.*;

import edu.ou.kmi.buddyspace.gui.*;
import edu.ou.kmi.buddyspace.plugins.conference.core.*;

/**
 * <code>BSConfCountdownDialog</code> allows input of parameters for 
 * countdown in conference room.
 *
 * @author  Jiri Komzak, Knowledge Media Institute, Open University, United Kingdom
 */

public class BSConfCountdownDialog extends JDialog {
    private JOptionPane optionPane;
    
    public String name = null;
    public int minutes = 0;
    public int seconds = 0;
    
    /** Constructor */
    public BSConfCountdownDialog(Frame _parent) {
                         
        super(_parent, "Countdown", true);
        
        final Frame parent = _parent;
        
        final JTextField nameTextField = new JTextField("Meeting starts in");
        final JTextField minutesTextField = new JTextField(5);
        minutesTextField.setText(Integer.toString(5));
        final JTextField secondsTextField = new JTextField(5);
        secondsTextField.setText(Integer.toString(0));
        
        Object[] fields = {"Countdown name: ", nameTextField,
                           "Countdown time:",
                           "minutes: ", minutesTextField,
                           "seconds: ", secondsTextField};
        
        final String okButton = "OK";
        final String cancelButton = "Cancel";
        Object[] options = {okButton, cancelButton};

        optionPane = new JOptionPane(fields, 
                                     JOptionPane.PLAIN_MESSAGE,
                                     JOptionPane.OK_CANCEL_OPTION,
                                     null,
                                     options,
                                     options[0]);
        setContentPane(optionPane);
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

        pack();
        setLocationRelativeTo(parent);
        
        // handles actions
        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;
                    }

                    // 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 (value.equals(okButton)) {
                        try {
                            String minutesStr = minutesTextField.getText();
                            minutes = Integer.parseInt(minutesStr);
                        } catch(NumberFormatException ev) {
                            JOptionPane.showMessageDialog(parent, 
                                          "Number of minutes must be a number",
                                          "Error", 
                                          JOptionPane.ERROR_MESSAGE);
                            minutes = seconds = 0;
                            name = null;
                            return;
                        }
                        
                        try {
                            String secondsStr = secondsTextField.getText();
                            seconds = Integer.parseInt(secondsStr);
                        } catch(NumberFormatException ev) {
                            JOptionPane.showMessageDialog(parent, 
                                          "Number of seconds must be a number",
                                          "Error", 
                                          JOptionPane.ERROR_MESSAGE);
                            minutes = seconds = 0;
                            name = null;
                            return;
                        }
                        
                        if (minutes < 0 || seconds < 0 || (minutes == 0 && seconds == 0)) {
                            JOptionPane.showMessageDialog(parent, 
                                          "Time must be greater then zero",
                                          "Error", 
                                          JOptionPane.ERROR_MESSAGE);
                            minutes = seconds = 0;
                            name = null;
                            return;
                        }
                        
                        name = nameTextField.getText();
                        
                        setVisible(false);
                    }
                    else if (value.equals(cancelButton)) {
                        minutes = seconds = 0;
                        name = null;
                        setVisible(false);
                    }
                }
            }
        });
    }
}