// make Undo, i.e. revert the object to its previous state
public bool Undo(bool storeSateteBeforOperation = false)
{
if (undoList.Count > 0)
{
// get the object state from the undo list
ObjectPropertyValuePair undoObject = undoList[0];
// suspend the object from notification
// otherwise we will be notified for an action which we perform and should be inserted in any list
undoObject.O.SuspendListener = true;
// revert to the state
var prevState = undoObject.SetState();
// after we execute the operation we won to resume the notifications
undoObject.O.SuspendListener = false;
// remove this state from undo list
undoList.Remove(undoObject);
// IF WE WANT TO SAVE CURRENT STATE
if (storeSateteBeforOperation)
{
this.AddToRedo(prevState);
}
// add this state to the redo list
this.AddToRedo(undoObject);
return(true);
}
return(false);
}
public bool Redo(bool storeSateteBeforOperation = false)
{
if (redoList.Count > 0)
{
ObjectPropertyValuePair redoObject = redoList[0];
redoObject.O.SuspendListener = true;
var prevState = redoObject.SetState();
redoObject.O.SuspendListener = false;
redoList.Remove(redoObject);
// IF WE WANT TO SAVE CURRENT STATE
if (storeSateteBeforOperation)
{
this.AddToUndo(prevState);
}
this.AddToUndo(redoObject);
return(true);
}
return(false);
}