KeyListener funktioniert nicht!

[Ishildur]

Hallo Leute, ich bin zwar nicht gerade ein Anfänger, was Java angeht, aber im Moment komme ich echt nicht mehr weiter! :-( Ich versuche ganz einfach einer JComponent einen KeyListener anzuhängen, aber es werden einfach keine Events geworfen? Gibt es vielleicht bestimmte Einschränkungen, die ich beachten muss?

// ######################################## class Board #######################################
public class Board extends JComponent
implements Runnable,KeyListener,MouseListener,MouseMotionListener,GameListener{
 // ---------------------------------------- constants ----------------------------------------
 public static final byte GRP_SRC = 0x01; // source group
 public static final byte GRP_DST = 0x01; // destination group
 public static final byte GRP_MIL = 0x02; // mill group
 // -------------------------------------------------------------------------------------------
 
 // ------------------------------------- dynamic members -------------------------------------
 private Game                gam;     // the game instance to render
 private int[]               arrCoo;  // coords representing the position of each field
 private BufferedImage       imgBgi;  // background - image
 private BufferedImage       imgWht;  // white stone - image
 private BufferedImage       imgBlk;  // black stone - image
 private BufferedImage       imgWin;  // winner image
 private BufferedImage       imgLos;  // looser image
 private Point               pntMov;  // position of the currently moving stone if any
 private Cursor              crsHnd;  // hand cursor
 private Player              plyCmp;  // the computer player
 private Move                mov;     // the move to execute
 private AnimationController aniCtr;  // an animation controller
 private Protocol            proto;   // a protocol       
 private boolean             bShwPrt; // flag if the protocol shall be rendered
 private boolean             bShwRul; // flag if the rules shall be rendered
 // -------------------------------------------------------------------------------------------
 
 // ----------------------------------- default constructor -----------------------------------
 public Board(Game gam,String strBgi){/*
  // copy the game and register this instance as listener
  this.gam = gam;
  this.gam.addGameListener(this);

  // create an array containing the 2D - coordinates of all fields
  this.arrCoo = new int[]{
   166,44,377,44,590,44,590,256,590,468,377,468,166,468,166,256,
   236,114,377,114,520,114,520,256,520,398,377,398,236,398,236,256,
   306,184,377,184,450,184,450,256,450,328,377,328,306,328,306,256
  };
  
  // open a try statements as there may occure an exception
  try{
   // load all needed images
   this.imgBgi = ImageIO.read(this.getClass().getResource(strBgi));
   this.imgWht = ImageIO.read(this.getClass().getResource("/rsc/wht.png"));
   this.imgBlk = ImageIO.read(this.getClass().getResource("/rsc/blk.png"));
   this.imgWin = ImageIO.read(this.getClass().getResource("/rsc/win.png"));
   this.imgLos = ImageIO.read(this.getClass().getResource("/rsc/los.png"));
  
   // setup the moving point and load the hand cursor
   this.pntMov  = null;
   BufferedImage imgHnd = ImageIO.read(this.getClass().getResource("/rsc/hnd.png"));
   this.crsHnd = this.getToolkit().createCustomCursor(imgHnd,new Point(5,7),"Hand");
  }
  // an exception is impossible as the required resources are inside the package
  catch(IOException exp){}
  
  // init the computer player by null and the source and destination by nil
  this.plyCmp = null;
  this.mov    = new Move(Game.SRC_NIL,Game.SRC_NIL);
  
  // create, setup and activate the animation controller
  this.aniCtr = new AnimationController(this,10);
  this.aniCtr.addAnimation(new Trail(81,367,Board.GRP_SRC,Trail.CLR_SRC));
  this.aniCtr.startAnimations();
  
  // create a new protocol instance and register it to the game
  this.gam.addGameListener(this.proto = new Protocol());
  this.bShwPrt = this.bShwRul = false;
  */
  // register this component as MouseListener and MouseMotionListener
  this.addKeyListener(this);
  this.addMouseListener(this);
  this.addMouseMotionListener(this);
 }
 // -------------------------------------------------------------------------------------------

 // ------------------------------ interface method "keyPressed" ------------------------------
 /**     This interface method will be called from awt whenever a key was typed
 @param  evt The KeyEvent related to this event
 @author Samuel Lörtscher */
 // -------------------------------------------------------------------------------------------
 public void keyPressed(KeyEvent evt){
  System.err.println("lkj");
 /* 
  // check if the F1 - key was typed
  if(evt.getKeyCode() == KeyEvent.VK_F1){
   // switch the show rules flag and repaint this component
   this.bShwRul = !this.bShwRul;
   this.repaint();
  }*/
 }
 // -------------------------------------------------------------------------------------------

Die Eventmethode "keyPressed" wird einfach niemals abgefeuert! :bahnhof:

 

[Ishildur]

Ich dreh noch mal durch mit Java:

import java.awt.event.*;
import javax.swing.*;

public class Main extends JFrame{
 public Main(){
  this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setTitle("Mühle (C) 2008 Samuel Lörtscher");
  this.setSize(762,567);
  
  A cmp = new A();
  cmp.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent evt){System.err.println("lkjlkj");}});
  this.getContentPane().add(cmp);
  
  this.setVisible(true);
 }
 
 public static void main(String[] args) {
  new Main();
 }
}

class A extends JComponent{
}

Der Event wird nicht ausgelöst? Wieso denn nicht? Was zum Teufel ist an diesem Code falsch??? :bahnhof:

Lg Ishildur

 

[Beni]

KeyEvents werden nur von der fokusierten Componente registriert. Dein "A" wird den Fokus nicht haben, und IMHO auch nie bekommen solange es nicht mit "setFocusable" fokusierbar gemacht wird.