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Java Discussion Thread
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Dec 22nd, 2004

undo - redo function in a text editor

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I have a text editor I've been working on, and I'm having some trouble with the undo/redo functions... It doesn't work, and I don't know what's wrong with it. I posted all of my code dealing with the undo function. I know it's a lot, but maybe you wont mind helping me. Any suggestions will help.

Java Syntax (Toggle Plain Text)

UndoManager undoManager;

Java Syntax (Toggle Plain Text)
textArea2.getDocument().addUndoableEditListener(this);
	textArea2.addFocusListener(this);
textArea2.getDocument().addUndoableEditListener(this);
	textArea2.addFocusListener(this);

Java Syntax (Toggle Plain Text)
 public void createUndoManager()
 {
	 undoManager = new UndoManager();
 }
 
 public void removeUndoManager()
 {
	 undoManager.end();
 }
  public void focusGained(FocusEvent fe)
 {
	 createUndoManager();
 }
 public void focusLost(FocusEvent fe)
 {
	 removeUndoManager();
 }
 public void undoableEditHappened(UndoableEditEvent uee) 
 {
	 undoManager.addEdit(uee.getEdit());
 }
 public void createUndoManager()
 {
	 undoManager = new UndoManager();
 }

 public void removeUndoManager()
 {
	 undoManager.end();
 }
  public void focusGained(FocusEvent fe)
 {
	 createUndoManager();
 }
 public void focusLost(FocusEvent fe)
 {
	 removeUndoManager();
 }
 public void undoableEditHappened(UndoableEditEvent uee) 
 {
	 undoManager.addEdit(uee.getEdit());
 }

Java Syntax (Toggle Plain Text)
public void undoableEditHappened(UndoableEditEvent uee) 
 {
	 undoManager.addEdit(uee.getEdit());
 }
public void undoableEditHappened(UndoableEditEvent uee) 
 {
	 undoManager.addEdit(uee.getEdit());
 }

Java Syntax (Toggle Plain Text)
if ((ae.getSource() == btnUndo) || ae.getActionCommand().equals("Undo"))
{	
 try
	 {
		 undoManager.undo();
	 }
	 catch (CannotUndoException cue)
	 {
		 Toolkit.getDefaultToolkit().beep();
	 }
 }
}
if ((ae.getSource() == btnUndo) || ae.getActionCommand().equals("Undo"))
{	
 try
	 {
		 undoManager.undo();
	 }
	 catch (CannotUndoException cue)
	 {
		 Toolkit.getDefaultToolkit().beep();
	 }
 }
}

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server_crash

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Postaholic

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2,108 posts
since Jun 2004

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Jan 3rd, 2005

Re: undo - redo function in a text editor

Hi everyone,

You are resetting your UndoManager class every time so there is always nothing to undo. Basically remove the createUndoManager() function and create that class once as a global class with a global instance only once.

Don't forget the import stsement for the undo class as well

Richard West

freesoft_2000

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Practically a Master Poster

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623 posts
since Jun 2004

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Jan 3rd, 2005

Re: undo - redo function in a text editor

I finally got it fixed about a week ago..I was making it way more difficult than it was.

server_crash

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Postaholic

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2,108 posts
since Jun 2004

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Sep 12th, 2006

Re: undo - redo function in a text editor

Please Sand me your all code of the editor.
Plz
Plz
Thanks

Bhavna.ce

Reputation Points: 10

Solved Threads: 1

Newbie Poster

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1 posts
since Sep 2006

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Sep 12th, 2006

Re: undo - redo function in a text editor

do your own homework kid.

jwenting

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duckman

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7,719 posts
since Nov 2004

This thread is solved

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