KeyEventDispatcher'ı nasıl kullanırım?

Question

Bir başlangıç ​​projesinin bir parçası olarak bir Pong klonu yapmaya çalışıyorum ve bir yol bloğuna çarptım. Klavye desteği noktasına ulaşmayı başardım, ancak klavye tekrarlama gecikmesi başladı. KeyEventDispatcher'ı kullanmanın herhangi bir yolunu bulamadım. DispatchKeyEvent() yöntemini bile başlatmaz. Bunu kullanarak nasıl giderim?

Şimdiden teşekkürler.

Not: Burada şimdiye kadar benim kaynağıdır: http://pastebin.com/N9fLMzFT

Answer 1

Eğer KeyBindings

import java.awt.*; 
import java.awt.event.*; 
import java.awt.image.BufferedImage; 
import java.io.IOException; 
import java.net.*; 
import java.util.HashMap; 
import java.util.Map; 
import javax.imageio.ImageIO; 
import javax.swing.*; 

public class MoveIcon extends JPanel { 

    private static final long serialVersionUID = 1L; 
    private static final String IMAGE_PATH = "http://duke.kenai.com/misc/Bullfight.jpg"; 
    private static final String IMAGE_PATH_PLAYER = "http://duke.kenai.com/iconSized/duke4.gif"; 
    public static final int STEP = 3; 
    private static final int TIMER_DELAY = STEP * 8; 
    private BufferedImage bkgrndImage = null; 
    private BufferedImage playerImage = null; 
    private Map<Direction, Boolean> directionMap = new HashMap<Direction, Boolean>(); 
    private int playerX = 0; 
    private int playerY = 0; 

    enum Direction { 

     UP(KeyEvent.VK_UP, 0, -1), DOWN(KeyEvent.VK_DOWN, 0, 1), 
     LEFT(KeyEvent.VK_LEFT, -1, 0), RIGHT(KeyEvent.VK_RIGHT, 1, 0); 
     private int keyCode; 
     private int xDirection; 
     private int yDirection; 

     private Direction(int keyCode, int xDirection, int yDirection) { 
      this.keyCode = keyCode; 
      this.xDirection = xDirection; 
      this.yDirection = yDirection; 
     } 

     public int getKeyCode() { 
      return keyCode; 
     } 

     public int getXDirection() { 
      return xDirection; 
     } 

     public int getYDirection() { 
      return yDirection; 
     } 
    } 

    public MoveIcon() { 
     try { 
      URL bkgrdImageURL = new URL(IMAGE_PATH); 
      URL playerImageURL = new URL(IMAGE_PATH_PLAYER); 
      bkgrndImage = ImageIO.read(bkgrdImageURL); 
      playerImage = ImageIO.read(playerImageURL); 
      setPreferredSize(new Dimension(bkgrndImage.getWidth(), bkgrndImage.getHeight())); 
     } catch (MalformedURLException e) { 
      e.printStackTrace(); 
     } catch (IOException e) { 
      e.printStackTrace(); 
     } 
     for (Direction direction : Direction.values()) { 
      directionMap.put(direction, false); 
     } 
     setKeyBindings(); 
     Timer timer = new Timer(TIMER_DELAY, new TimerListener()); 
     timer.start(); 
    } 

    private void setKeyBindings() { 
     InputMap inMap = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW); 
     ActionMap actMap = getActionMap(); 
     for (final Direction direction : Direction.values()) { 
      KeyStroke pressed = KeyStroke.getKeyStroke(direction.getKeyCode(), 0, false); 
      KeyStroke released = KeyStroke.getKeyStroke(direction.getKeyCode(), 0, true); 
      inMap.put(pressed, direction.toString() + "pressed"); 
      inMap.put(released, direction.toString() + "released"); 
      actMap.put(direction.toString() + "pressed", new AbstractAction() { 

       private static final long serialVersionUID = 1L; 

       @Override 
       public void actionPerformed(ActionEvent e) { 
        directionMap.put(direction, true); 
       } 
      }); 
      actMap.put(direction.toString() + "released", new AbstractAction() { 

       private static final long serialVersionUID = 1L; 

       @Override 
       public void actionPerformed(ActionEvent e) { 
        directionMap.put(direction, false); 
       } 
      }); 
     } 

    } 

    @Override 
    protected void paintComponent(Graphics g) { 
     super.paintComponent(g); 
     if (bkgrndImage != null) { 
      g.drawImage(bkgrndImage, 0, 0, null); 
     } 
     if (playerImage != null) { 
      g.drawImage(playerImage, playerX, playerY, null); 
     } 
    } 

    private class TimerListener implements ActionListener { 

     @Override 
     public void actionPerformed(ActionEvent e) { 
      boolean moved = false; 
      for (Direction direction : Direction.values()) { 
       if (directionMap.get(direction)) { 
        playerX += STEP * direction.getXDirection(); 
        playerY += STEP * direction.getYDirection(); 
        moved = true; 
       } 
      } 
      if (moved) { 
       int x = playerX - 2 * STEP; 
       int y = playerY - 2 * STEP; 
       int w = playerImage.getWidth() + 4 * STEP; 
       int h = playerImage.getHeight() + 4 * STEP; 
       MoveIcon.this.repaint(x, y, w, h); // !! repaint just the player 
      } 
     } 
    } 

    private static void createAndShowUI() { 
     JFrame frame = new JFrame("MoveIcon"); 
     frame.getContentPane().add(new MoveIcon()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.pack(); 
     frame.setLocationRelativeTo(null); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     java.awt.EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       createAndShowUI(); 
      } 
     }); 
    } 
}