ChatFrame.java

package chat;

import javax.swing.JOptionPane;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

public class ChatFrame extends javax.swing.JFrame implements ChatCallbackAdapter {
    /**
	 * 
	 */
	private static final long serialVersionUID = 1580673677145725871L;
	private Chat chat;

    /** Creates new form Chat */
    public ChatFrame() {
        initComponents();
        setVisible(true);
        setLocationRelativeTo(null);
        disableNewMessages();
        
        startChat();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
    private void initComponents() {

        MessagesScrollPane = new javax.swing.JScrollPane();
        MessagesTextArea = new javax.swing.JTextArea();
        NewMessageScrollPane = new javax.swing.JScrollPane();
        NewMessageTextArea = new javax.swing.JTextArea();
        SendButton = new javax.swing.JButton();
        OnlineUsersLabel = new javax.swing.JLabel();
        OnlineUsers = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Chat");

        MessagesTextArea.setColumns(20);
        MessagesTextArea.setEditable(false);
        MessagesTextArea.setRows(5);
        MessagesScrollPane.setViewportView(MessagesTextArea);

        NewMessageTextArea.setColumns(20);
        NewMessageTextArea.setRows(5);
        NewMessageScrollPane.setViewportView(NewMessageTextArea);

        SendButton.setText("Send");
        SendButton.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                SendButtonActionPerformed(evt);
            }
        });

        OnlineUsersLabel.setText("Online:");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(MessagesScrollPane, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(NewMessageScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 295, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(SendButton, javax.swing.GroupLayout.DEFAULT_SIZE, 75, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addComponent(OnlineUsersLabel)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(OnlineUsers, javax.swing.GroupLayout.DEFAULT_SIZE, 326, Short.MAX_VALUE)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(OnlineUsersLabel)
                    .addComponent(OnlineUsers))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(MessagesScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 192, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(SendButton, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(NewMessageScrollPane, javax.swing.GroupLayout.DEFAULT_SIZE, 51, Short.MAX_VALUE))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void SendButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_SendButtonActionPerformed
        chat.sendMessage(NewMessageTextArea.getText());
        MessagesTextArea.append("Me: " + NewMessageTextArea.getText() + "\n");
        NewMessageTextArea.setText(null);
    }//GEN-LAST:event_SendButtonActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new ChatFrame();
            }
        });
    }
    
    
    public void startChat() {
        MessagesTextArea.append("Connecting...");
        chat = new Chat(this);
        chat.start();
    }
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JScrollPane MessagesScrollPane;
    private javax.swing.JTextArea MessagesTextArea;
    private javax.swing.JScrollPane NewMessageScrollPane;
    private javax.swing.JTextArea NewMessageTextArea;
    private javax.swing.JLabel OnlineUsers;
    private javax.swing.JLabel OnlineUsersLabel;
    private javax.swing.JButton SendButton;
    // End of variables declaration//GEN-END:variables

    public void disableNewMessages() {
        NewMessageTextArea.setEnabled(false);
        SendButton.setEnabled(false);
    }
    
    public void enableNewMessages() {
        NewMessageTextArea.setEnabled(true);
        SendButton.setEnabled(true);
    }
    
    @Override
    public void callback(JSONArray data) throws JSONException {}

    @Override
    public void on(String event, JSONObject obj) {
        try {
            if (event.equals("user message")) {
                MessagesTextArea.append(obj.getString("user") + ": " + obj.getString("message") + "\n");
            }

            else if (event.equals("announcement")) {
                MessagesTextArea.append(obj.getString("user") + " " + obj.getString("action") + "\n");
            }

            else if (event.equals("nicknames")) {
                JSONArray names = obj.names();
                String str = "";
                for (int i=0; i < names.length(); i++) {
                    if (i != 0)
                        str += ", ";
                    str += names.getString(i);
                }
                OnlineUsers.setText(str);
            }
        } catch (JSONException ex) {
            ex.printStackTrace();
        }
    }

    @Override
    public void onMessage(String message) {}

    @Override
    public void onMessage(JSONObject json) {}

    @Override
    public void onConnect() {
        MessagesTextArea.append("done!\n");        
        enableNewMessages();
        
        String nickname = JOptionPane.showInputDialog(null, "Nickname", null, WIDTH);
        if (!nickname.isEmpty()) {
            chat.join(nickname);
            MessagesTextArea.append("You joined as " + nickname + "\n");
        }
    }

    @Override
    public void onDisconnect() {
        JOptionPane.showMessageDialog(null, "Connection lost", "Error", JOptionPane.ERROR_MESSAGE);
        disableNewMessages();
    }

    @Override
    public void onConnectFailure() {
        MessagesTextArea.append("error!\n");
    }

}