[英]JTable Not Redrawing When Repaint Called
嗨,我的计时器事件发生时,我的数据表无法重绘时遇到了困难。 我正在检查我正在制作的游戏中的玩家连通性。 当播放器连接时,JTable应该更改为显示播放器已连接; 但是,即使填充表的变量发生了变化,该表也没有发生变化。
我的GUI代码链接在下面,基本上是在连接了播放器时,GUI代码中的字符串变量发生了变化,然后我的计时器应该每秒重新绘制一次表格,并注意更改并重新绘制了正确的信息。 该变量正在更改,我可以在控制台中看到该输出,但是该表不会相应地更新。
谢谢您的光临。
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
@SuppressWarnings("serial")
public class DPServerGUI extends JFrame implements ActionListener
{
private DPServerTest mainServer;
private JPanel serverPanel;
private JButton startButton;
private JButton loadServerButton;
private JLabel serverLabel;
String[] header = {"Players", "Connected To Server"};
private JTable connectedClientsList;
private DefaultTableModel tableModel;
private JScrollPane scrollPane;
private static Dimension dim;
private Timer timer;
public static String player1Connected = "No";
public static String player2Connected = "No";
public static String player3Connected = "No";
public static String player4Connected = "No";
public DPServerGUI()
{
serverPanel = new JPanel();
startButton = new JButton("Start Game");
startButton.addActionListener(this);
loadServerButton = new JButton("Load Server");
loadServerButton.addActionListener(this);
tableModel = new DefaultTableModel();
scrollPane = new JScrollPane(getTable());
serverLabel = new JLabel("Server Not Running");
dim = Toolkit.getDefaultToolkit().getScreenSize();
serverPanel.add(serverLabel);
serverPanel.add(startButton);
serverPanel.add(loadServerButton);
serverPanel.add(scrollPane);
this.add(serverPanel);
}
private JTable getTable()
{
String[][] table =
{
{"Player 1", player1Connected},
{"Player 2", player2Connected},
{"Player 3", player3Connected},
{"Player 4", player4Connected}
};
connectedClientsList = new JTable(table, header);
return connectedClientsList;
}
public void updatePlayerList()
{
String [][] playerList = mainServer.exportPlayerList();
connectedClientsList = new JTable(playerList, header);
}
@Override
public void actionPerformed(ActionEvent event)
{
if (event.getSource() == loadServerButton)
{
System.out.println("Load server clicked!");
loadServerButton.setEnabled(false);
mainServer = new DPServerTest(8888);
serverLabel.setText("Server Loaded!");
timer = new Timer(1000, this);
timer.start();
}
if (event.getSource() == startButton)
{
serverLabel.setText("Game Started");
}
if (event.getSource() == timer)
{
mainServer.playerConnectionStatus();
String[][] table =
{
{"Player 1", player1Connected},
{"Player 2", player2Connected},
{"Player 3", player3Connected},
{"Player 4", player4Connected}
};
connectedClientsList = new JTable(table, header);
if (player1Connected != "No") System.out.println(player1Connected);
repaint();
}
}
public static void main(String[] args)
{
DPServerGUI serverGUI = new DPServerGUI();
serverGUI.setTitle("Dark Project Server GUI");
serverGUI.setSize(800,600);
serverGUI.setLocationRelativeTo(null);
serverGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
serverGUI.setVisible(true);
}
}
问题是您要重新创建一个新的JTable
而不是重新使用现有的JTable
(此外,您不会删除旧的JTable
来用新的JTable
替换它,因此新的JTable
将永远没有机会显示) 。
而是更新JTable
的TableModel
。 使用提供的默认表(可以通过调用JTable.getModel()
来获取它)(它是DefaultTableModel
),或者通过扩展AbstractTableModel
(并调用fireXXX()
方法)来实现自己的fireXXX()
,您可以使用JTable.setModel()
进行设置。
查看有关如何使用表的Swing教程,尤其是TableModel
上的部分
附加提示:远离static
变量,它们总是很痛苦。
稍作更新的代码(不是很漂亮,但是向您展示了这个想法):
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.table.AbstractTableModel;
@SuppressWarnings("serial")
public class DPServerGUI extends JFrame {
private JPanel serverPanel;
private JButton startButton;
private JButton loadServerButton;
private JLabel serverLabel;
private JTable connectedClientsList;
private JScrollPane scrollPane;
public String player1Connected = "No";
public String player2Connected = "No";
public String player3Connected = "No";
public String player4Connected = "No";
public DPServerGUI() {
serverPanel = new JPanel();
startButton = new JButton("Start Game");
loadServerButton = new JButton("Load Server");
scrollPane = new JScrollPane(getTable());
serverLabel = new JLabel("Server Not Running");
serverPanel.add(serverLabel);
serverPanel.add(startButton);
serverPanel.add(loadServerButton);
serverPanel.add(scrollPane);
this.add(serverPanel);
}
private PlayerTableModel tableModel;
public class PlayerTableModel extends AbstractTableModel {
private String[] header = { "Players", "Connected To Server" };
private String[][] table = { { "Player 1", player1Connected }, { "Player 2", player2Connected }, { "Player 3", player3Connected },
{ "Player 4", player4Connected } };
@Override
public String getColumnName(int column) {
return header[column];
}
@Override
public int getRowCount() {
return table.length;
}
@Override
public int getColumnCount() {
return header.length;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
return table[rowIndex][columnIndex];
}
public void setPlayerConnected(int rowIndex, boolean connected) {
table[rowIndex][1] = connected ? "Yes" : "No";
fireTableCellUpdated(rowIndex, 1);
}
}
private JTable getTable() {
tableModel = new PlayerTableModel();
connectedClientsList = new JTable(tableModel);
return connectedClientsList;
}
public static void main(String[] args) {
final DPServerGUI serverGUI = new DPServerGUI();
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
serverGUI.setTitle("Dark Project Server GUI");
serverGUI.setSize(800, 600);
serverGUI.setLocationRelativeTo(null);
serverGUI.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
serverGUI.setVisible(true);
}
});
// Dummy thread that simulates user connecting and disconnecting randomly.
Timer t = new Timer(2000, new ActionListener() {
Random random = new Random();
@Override
public void actionPerformed(ActionEvent e) {
for (int i = 0; i < serverGUI.tableModel.getRowCount(); i++) {
serverGUI.tableModel.setPlayerConnected(i, random.nextBoolean());
}
}
});
t.start();
}
}
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