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Join Date: Jun 2004

Posts: 609

Reputation: freesoft_2000 is an unknown quantity at this point

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freesoft_2000 freesoft_2000 is offline

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Practically a Master Poster

Undo

Feb 13th, 2005

Hi everyone,

I am trying to add an undo listener to a jtable but could not get it to work. Does anyone know how to add a undo function to a jtable assuming the default cell editor component is a jtextfield?

A small code sample would be helpful

Any help is greatly appreciated

Thank You

Yours Sincerely

Richard West

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Join Date: Jun 2004

Posts: 2,108

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server_crash server_crash is offline

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Re: Undo

Feb 13th, 2005

are you wanting to add it to the textfield? If so, all you have to do is create a document from the textfield..

import these:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
import javax.swing.undo.*;
import javax.swing.event.*;
import javax.swing.text.*;
import javax.swing.undo.*;
import javax.swing.event.*;
import javax.swing.text.*;

add an UndoableEditListener

create an UndoManager as an instance variable

create a Document as an instance variable

then create the document and add the listener to it(That is if you want to add it to a textfield,this is the way I took it)

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
 
doc = (Document)txtDisplay.getDocument();
		doc.addUndoableEditListener(this);
doc = (Document)txtDisplay.getDocument();
		doc.addUndoableEditListener(this);

undoable edit event stuff

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

then do the undo and redo like this:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
        //don't need this method
	public void processUndo()
	{
		 try
		 {
			 /* call the UndoManagers undo method
			  */
			 undoManager.undo();
		 }
		 catch (CannotUndoException cre)
		 {
		 }
 
	}
        //don't need this method
	public void processUndo()
	{
		 try
		 {
			 /* call the UndoManagers undo method
			  */
			 undoManager.undo();
		 }
		 catch (CannotUndoException cre)
		 {
		 }

	}