How to stop ActionListener... HELP!

Question

Hi all!
I have a function in my imaging application which adds "stamps" to the image. This functions adds a picture as a stamp to any location on the image loaded into my app. The stamp functions works perfectly, as the user can add the stamp picture to the loaded image as many times as they wish to.
The problem is when the user clicks on another function to edit the image (ie. brightness, etc), the actionlistener is somehow still active allowing the user to continuously add stamps to the loaded image if the user clicks on to the loaded image
Is there anyway to stop the actionlistener so that when the user clicks on another function they can no longer add stamps to the screen if they click on the image???
This is the code for the button for the stamp function:
        else if(obj == stampButton)
               stampLoc = new String("images/censored.gif");
               stampImage = new ImageIcon(stampLoc).getImage();
               ImageIcon stampIcn = new ImageIcon("images/stamp.gif");
               Image stampImg = stampIcn.getImage();
               Toolkit tk = getToolkit();
               Cursor stampCursor = tk.createCustomCursor(stampImg, new Point(16,16), "Stamp Cursor");
               displayPanel.setCursor(stampCursor);
               displayPanel.addMouseListener(new MouseAdapter()
                    public void mousePressed(MouseEvent e)
                         displayPanel.createUndo();
                         stx = e.getX();
                         sty = e.getY();
                         System.out.println("JPanel: " + stx + "  " + sty);
                         displayPanel.drawImage(stx, sty, stampImage);
                    public void mouseClicked(MouseEvent e) {}
                    public void mouseReleased(MouseEvent e) {}
                    public void mouseEntered(MouseEvent e) {}
                    public void mouseDragged(MouseEvent e) {}
                    public void mouseMoved(MouseEvent e) {}
                    public void mouseExited(MouseEvent e) {}
                 //displayPanel.removeMouseListeners();
               displayPanel.validate();
               repaint();
               stx = 0;
               sty = 0;
          }This line below draws the stamp on screen, and i have tried placing it outside of the mousePressed listener, but then the stamp feature does not work propely. What it then does is place the image at coordinates (0,0) of the image, and when user clicks on the image no stamp is added to it.
displayPanel.drawImage(stx, sty, stampImage);
This is the drawImage() method which is located in my DisplayPanel class:
     public void drawImage(int x, int y, Image stmpImg)
          mBufferedImageStamp = copy(mBufferedImage);
          Graphics graphics = mBufferedImageStamp.getGraphics();
          Image image = new ImageIcon(stmpImg).getImage();
          graphics.drawImage(image, (x-(image.getWidth(this)/2)), (y-(image.getHeight(this)/2)), this);
          graphics = mBufferedImage.getGraphics();
          graphics.drawImage(mBufferedImageStamp, 0, 0, this);
          repaint();
     }I hope someone can help me! :)
This is a huge bug in my app and i have no idea on how to correct it :(
Thanks for anyways help or advice in advance!
Claire
x

Answer 1

The idea is to do only what you need to do inside an event handler.
In your stampButton event handler you define a string, load an image, create an ImageIcon, create and set a new Cursor and add a MouseListener(!).
Most of this can be taken out of the event handler. You only need to load the image and create the cursor once (you can set the cursor in the event handler). Same with the mouse listener. Add it to displayPanel one time, perhaps as an inner named or outer class extending MouseAdapter; and it will always have the mouse location available. You can get this position from the mouse listener when you need it inside stampButton.
You want to design the stampButton handler so that it only draws a stamp, only when the stamp button is pressed.