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  Solved: JFrame - Problem with changing JPanel  (Read 780 times)
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Offline Phibedy

Senior Member


Medals: 8



« Posted 2012-06-20 23:37:49 »

Hi, we got a problem,
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//Main-Class;

public void actionPerformed(ActionEvent e){
     
      if (e.getSource() == mainMenuButtons[0]) {
         
         try {
            GameWindow.gw.setLoadingPanel();
         } catch (IOException e2) {
            e2.printStackTrace();
         }
         
         PictureIds.setObjectPictureIds();
         PictureIds.setTerrainPictureIds();
         
         try {
            GameWindow.gw.setGamePanel();
         } catch (IOException e1) {
            e1.printStackTrace();
         }


//Game-Window-class

   public void setLoadingPanel() throws IOException{
      GameWindow.this.getContentPane().removeAll();
      lpanel = new LoadingPanel();
      this.add(lpanel);
      this.validate();
      this.repaint();
      lpanel.grabFocus();
      lpanel.repaint();
   }


//LoadingPanel-class

   public LoadingPanel() {
      super();
      this.setFocusable(true);
      this.grabFocus();
      System.out.println("Loading Const.");
   }
   
   public void paint(Graphics g) {
      super.paint(g);
      System.out.println("Loading");
      g.drawImage(loadingScreen, 0, 0, null);
      g.dispose();
   }
}

//GamePanel-class
  public GamePanel() throws IOException {
      super();
      moveThread = new MoveThread(this);
      Thread start = new Thread(moveThread);
      start.start();
........
}


Our problem is that the paint-method in LoadingPanel-class is never called. If you comment GameWindow.gw.setGamePanel() out, "PictureIds.setObjectPictureIds() PictureIds.setTerrainPictureIds();" are both called before the paint-method in the LoadingPanel-class.
It should repaint after the constructor of LoadingPanel, and before the other methods are called because a loading-screen which is called after the loading is quite useless.
best regards
Offline ra4king

JGO Kernel


Medals: 342
Projects: 2
Exp: 5 years


I'm the King!


« Reply #1 - Posted 2012-06-21 02:59:02 »

That's because the LoadingPanel is never even shown at all. You set the LoadingPanel, load the resources, then set the GamePanel in the same method. Even worse, that method is called on the EDT (Event Dispatch Thread), which controls events such as repainting, action events, etc...

The solution would be to create a new thread that loads the resources, then notifies the EDT to set the GamePanel once it is done Smiley

EDIT: Ah you seem to believe that 'repaint()' blocks until it repaints the screen. Sadly it is not so. What it actually does is post a repaint event on the EDT queue. This means that the EDT will repaint the screen as soon as it is done with all the other tasks, such as returning from that actionPerformed method. Wink

Offline Phibedy

Senior Member


Medals: 8



« Reply #2 - Posted 2012-06-21 14:54:00 »

Thx, I will have a try Smiley

Edit:
Worked  Grin
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Legends of Yore - The Casual Retro Roguelike
Offline twinflyer

Senior Newbie


Exp: 2 years



« Reply #3 - Posted 2012-06-21 22:03:26 »

I'm making the game together with Phibedy.
We're now loading all recources (png's, Maps, Objects, Players.....ect. ) in a new Thread. Everything works as it should (even the loading screen Wink )

Thanks,
twinflyer
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