?? jchat.java
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import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
public class JChat extends JFrame implements ActionListener
{
private JEditorPane txtConversation = new JEditorPane();
private JTextArea txtSend = new JTextArea();
private JButton btnSend = new JButton("Send");
private JList lstUsers;
private CChatListener listener;
private JScrollPane scrlConversation;
private DefaultListModel lstUserList = new DefaultListModel();
// Menu items
private JMenuBar topMenu;
private JMenu loginMenu, helpMenu;
private JMenuItem menuItemLogin, menuItemSettings, menuItemExit, menuItemAbout;
// Message Data items
private String messageHeader = "<html><body bgcolor=\"#FFFFFF\" text=\"#000000\" " +
"leftmargin=\"5\" topmargin=\"5\" marginwidth=\"5\" marginheight=\"5\">";
private String messageFooter = "</body></html>";
private String messages = "";
public JChat(CChatListener l, String title)
{
super(title);
listener = l;
// Setup the controls
controlsSetup();
// Setup the menu
menuSetup();
pack();
// Treat pressing the [x] as logging out
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
private void controlsSetup()
{
// Create the conversation label
JLabel lblConversation = new JLabel("Conversation:");
// Create the conversation text area
txtConversation.setEditable(false);
txtConversation.setContentType("text/html");
txtConversation.setText("<html><p style=\"font-family:verdana\">Welcome</p></html>");
// Create the conversation scroll pane
scrlConversation = new JScrollPane(txtConversation);
scrlConversation.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrlConversation.setPreferredSize(new Dimension(400,300));
scrlConversation.setMinimumSize(new Dimension(10, 10));
// Create the lefttop pane
JPanel lefttopPane = new JPanel();
BoxLayout lefttopBox = new BoxLayout(lefttopPane, BoxLayout.Y_AXIS);
lefttopPane.setLayout(lefttopBox);
lefttopPane.add(lblConversation);
lefttopPane.add(scrlConversation);
// Create the send label
JLabel lblSend = new JLabel("Send Message:");
// Create the send text scroll pane and the send button
JScrollPane scrlSend = new JScrollPane(txtSend);
scrlSend.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrlSend.setPreferredSize(new Dimension(330, 30));
scrlSend.setMinimumSize(new Dimension(10, 10));
// Set the send button properties
btnSend.setPreferredSize(new Dimension(70,30));
btnSend.setMinimumSize(new Dimension(10, 10));
btnSend.addActionListener(this);
// Set the send pane
JPanel sendPane = new JPanel();
BoxLayout sendBox = new BoxLayout(sendPane, BoxLayout.X_AXIS);
sendPane.setLayout(sendBox);
sendPane.add(scrlSend);
sendPane.add(btnSend);
// Create the leftbottom pane
JPanel leftbottomPane = new JPanel();
BoxLayout leftBottomBox = new BoxLayout(leftbottomPane, BoxLayout.Y_AXIS);
leftbottomPane.setLayout(leftBottomBox);
leftbottomPane.add(lblSend);
leftbottomPane.add(sendPane);
// Create the left split pane
JSplitPane leftSplitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT,
lefttopPane,
leftbottomPane);
leftSplitPane.setOneTouchExpandable(false);
leftSplitPane.setDividerLocation(300);
leftSplitPane.setPreferredSize(new Dimension(400, 400));
// Create the list on the right hand side
lstUsers = new JList(lstUserList);
lstUsers.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
JScrollPane scrlContacts = new JScrollPane(lstUsers);
scrlContacts.setVerticalScrollBarPolicy(
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrlContacts.setHorizontalScrollBarPolicy(
JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrlContacts.setPreferredSize(new Dimension(150, 400));
scrlContacts.setMinimumSize(new Dimension(10, 10));
// Create a split pane between the conversation and the list
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
leftSplitPane,
scrlContacts);
splitPane.setOneTouchExpandable(true);
splitPane.setDividerLocation(400);
splitPane.setPreferredSize(new Dimension(550, 400));
setContentPane(splitPane);
// Setup a mouse listener to trap double clicks
// on a list item
MouseListener mouseListener = new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
int index = lstUsers.locationToIndex(e.getPoint());
listener.onInitiatePrivateMessage((String)lstUserList.get(index));
}
}
};
lstUsers.addMouseListener(mouseListener);
}
public void menuSetup()
{
topMenu = new JMenuBar();
setJMenuBar(topMenu);
loginMenu = new JMenu("Login");
menuItemLogin = new JMenuItem("Change user");
loginMenu.add(menuItemLogin);
menuItemExit = new JMenuItem("Exit");
loginMenu.add(menuItemExit);
menuItemLogin.addActionListener(this);
menuItemExit.addActionListener(this);
topMenu.add(loginMenu);
helpMenu = new JMenu("Help");
menuItemAbout = new JMenuItem("About...");
menuItemAbout.addActionListener(this);
helpMenu.add(menuItemAbout);
topMenu.add(helpMenu);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == btnSend)
{
// Replace all new lines with <br> tags when we send the data
listener.onSendMessageToAll(txtSend.getText().replaceAll("\n", "<br>"));
txtSend.setText("");
}
if(e.getSource() == menuItemExit)
{
System.exit(0);
}
if(e.getSource() == menuItemAbout)
{
JOptionPane.showMessageDialog(null, "Created by Martin Adams", "JMessenger", JOptionPane.INFORMATION_MESSAGE);
}
if(e.getSource() == menuItemLogin)
{
// Disconnect and show the login menu again
}
}
public void showChat()
{
// Clear the list and reset the message header
lstUserList.clear();
messages = "";
txtConversation.setText(messageHeader + messageFooter);
txtSend.setText("");
setVisible(true);
}
public void messageReceived(String from, String message)
{
addMessage("<b><font face=\"Verdana, Arial, Helvetica, sans-serif\" size=\"2\" color=\"#000066\">" +
from + ": </font></b>" +
"<font face=\"Verdana, Arial, Helvetica, sans-serif\" size=\"2\" color=\"#006699\">" +
message + "</font><br>");
}
private void addMessage(String message)
{
messages += message;
txtConversation.setText(messageHeader + messages + messageFooter);
txtConversation.selectAll();
txtConversation.setCaretPosition(txtConversation.getSelectedText().length());
}
public void userJoined(String username)
{
lstUserList.addElement(username);
addMessage("<b><font face=\"Verdana, Arial, Helvetica, sans-serif\" size=\"2\" color=\"#990000\">" +
"User " + username + " has joined!</font></b><br>");
}
public void userLeft(String username)
{
for(int i = 0; i < lstUserList.getSize(); i++)
{
if(((String)lstUserList.get(i)).equalsIgnoreCase(username))
{
lstUserList.remove(i);
break;
}
}
addMessage("<b><font face=\"Verdana, Arial, Helvetica, sans-serif\" size=\"2\" color=\"#990000\">" +
"User " + username + " has left!</font></b><br>");
}
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