Implements an Undo/Redo in MVC
- by bnabilos
Hello,
I have a Java application and I want to implement an Undo/Redo option. the value that I want to stock and that I want to be able to recover is an integer.
My Class Model implements the interface StateEditable and I have to redefine the 2 functions restoreState(Hashtable<?, ?> state) and storeState(Hashtable<Object, Object> state) but I don't know what to put on them. It will be really great if somebody can help me to do that.
These are the first lines of my Model class, the value that I want to do an undo/redo on it is value
public class Model extends Observable implements StateEditable
{
private int value = 5;
private UndoManager undoRedo = new UndoManager();
final UndoableEditListener editListener = new UndoableEditListener() {
public void undoableEditHappened(UndoableEditEvent evt) {
undoRedo.addEdit(evt.getEdit());
}
};
@Override
public void restoreState(Hashtable<?, ?> state)
{
}
@Override
public void storeState(Hashtable<Object, Object> state)
{
}
}
