ChatWindow.java

package fr.crafttim.chat.client.ui;

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;

import fr.crafttim.chat.client.ChatClient;

public class ChatWindow extends JFrame implements ActionListener{

    private static final long serialVersionUID = -5803068651600629507L;
    private ChatClient chatClient;
    private JTextPane textPane;
    private JTextField tInput;

    public ChatWindow(ChatClient chatClient){
        this.chatClient = chatClient;
        getContentPane().setLayout(new BorderLayout(0, 0));

        JPanel panel = new JPanel();
        getContentPane().add(panel, BorderLayout.SOUTH);
        GridBagLayout gbl_panel = new GridBagLayout();
        gbl_panel.columnWidths = new int[]{0, 0, 0};
        gbl_panel.rowHeights = new int[]{0, 0, 0};
        gbl_panel.columnWeights = new double[]{1.0, 0.0, Double.MAX_VALUE};
        gbl_panel.rowWeights = new double[]{1.0, 0.0, Double.MIN_VALUE};
        panel.setLayout(gbl_panel);

        tInput = new JTextField();
        GridBagConstraints gbc_input = new GridBagConstraints();
        gbc_input.insets = new Insets(0, 0, 0, 5);
        gbc_input.anchor = GridBagConstraints.NORTH;
        gbc_input.fill = GridBagConstraints.HORIZONTAL;
        gbc_input.gridx = 0;
        gbc_input.gridy = 0;
        panel.add(tInput, gbc_input);
        tInput.setColumns(10);
        tInput.setActionCommand("send");
        tInput.addActionListener(this);

        JButton bSend = new JButton("Send");
        GridBagConstraints gbc_bSend = new GridBagConstraints();
        gbc_bSend.gridx = 0;
        gbc_bSend.gridy = 0;
        panel.add(bSend, gbc_bSend);
        bSend.setActionCommand("send");
        bSend.addActionListener(this);

        JScrollPane scrollPane = new JScrollPane();
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        textPane = new JTextPane();
        textPane.setEditable(false);
        scrollPane.setViewportView(textPane);
    }

    public void postLine(final String line){
        Runnable doLater = new Runnable() {

            @Override
            public void run() {
                String old = textPane.getText();
                String nText = null;
                if(!old.equals("")){
                    nText = old + System.getProperty("line.separator") + line;
                } else {
                    nText = line;
                }
                textPane.setText(nText);
            }
        };
        SwingUtilities.invokeLater(doLater);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(e.getActionCommand().equals("send")){
            String t = tInput.getText();
            if(!t.equals("")){
                chatClient.getClientSide().write(t);
                tInput.setText("");
            }
        }
    }

}