help with manipulating text in JPanel

[nnmaw]

hi all

i am writing an editor like MS Paint, my canvas is extending JPanel. I provide the facility to draw basic shape and text. I am getting trouble with text.

I have TextResource class which maintains input character in String and manipulate the key with StringBuffer when an character is typed and use TextLayout to display for user.

So I have to handle all input key stroke and i can handle BackSpace, Left and Right arrow key. But I cannot handle Space and Tab and the rest of whitespace.

So I am having the second thought that the java classes I used might not be appropriate. So please help me. Any suggestion will be appreciated! Thank you very much for your time.

here is some important code:

// in order to add a character into TextResource
// please ignore EBObjectAttribute, I used it for Property Table.

 
public void addCharacter(char c, int code) {
        try {
            StringBuffer buffer = new StringBuffer(text.getStringValue());
            if (code == KeyEvent.VK_BACK_SPACE) {
                if (this.cursorPosition > 0)
                    buffer.deleteCharAt(this.cursorPosition-1);
                handleArrowKey(false);
                this.text = new EBObjectAttribute(this, buffer.toString());
            }
            else if (code == KeyEvent.VK_LEFT || code == KeyEvent.VK_RIGHT) {
                handleArrowKey(code == KeyEvent.VK_RIGHT);
            }
            else if (code == KeyEvent.VK_DELETE) {
                if (this.cursorPosition >= 0 && this.cursorPosition < text.getStringValue().length())
                    buffer.deleteCharAt(this.cursorPosition);
                this.text = new EBObjectAttribute(this, buffer.toString());
            }
            else {
               if (Character.isDefined(c) && (code == KeyEvent.VK_SPACE || !Character.isWhitespace(c)))
                    buffer.insert(this.cursorPosition, c);
                this.text = new EBObjectAttribute(this, buffer.toString());
                handleArrowKey(true);
            }
        }
        catch (Exception e) { }      
    }

// in order to handle cursor position: code from Java sun Tutorial

 
 protected void handleArrowKey(boolean rightArrow) {
        try {
            if (text == null || text.getStringValue().length() == 0) {
                this.cursorPosition = 0;
                return;
            }
            textLayout = new TextLayout(this.text.getStringValue(), font, new FontRenderContext(null, false, false));
        }
        catch (Exception e) { }
        
        TextHitInfo newPosition;
        if (rightArrow)
            newPosition = textLayout.getNextRightHit(this.cursorPosition);
        else
            newPosition = textLayout.getNextLeftHit(this.cursorPosition);
        
        if (newPosition != null)
            this.cursorPosition = newPosition.getInsertionIndex();
    }