How to implment Undo/Redo for a editor

[Dinesh Bang]

Hi Ranchers,

I am looking to implement the undo/redo functionality for my custom editor. Any idea's how to achieve that ?

[Rob Spoor]

Each JTextComponent (including JTextArea and JTextField) have a Document. To this Document you can attach a UndoableEditListener. Combine this with an UndoManager.

[Dinesh Bang]

Thanks for quick response

Just to add up, Is there a generic way to handle Undo/Redo for whole perspective.
In my application I will be required to have it on all the views, project explorer ,editors etc.

[Rob Camick]

Read the secton from the Swing tutorial on "Text Component Features" for a working example.

[Rob Spoor]

Dinesh Bang wrote:Just to add up, Is there a generic way to handle Undo/Redo for whole perspective.
In my application I will be required to have it on all the views, project explorer ,editors etc.

You should still use UndoableEdit and UndoManager, but you must handle your own events that will create an UndoableEdit. Hint: extend AbstractUndoableEdit and override undo() and redo():

public void undo()
{
    super.undo();
    // roll back the changes
}

public void redo()
{
    super.redo();
    // make the changes again
}