/// <summary>Adds the specified action to be listed as an action that can be undone</summary>
public static void AddAction(UndoableAction action)
{
if (redoStack.Count > 0)
{
redoStack.Clear();
}
activitiesStack.Push(action);
//todo apply ( remove excess code )
action.Apply();
OnUndoAltered(activitiesStack.Count, action);
OnRedoAltered(redoStack.Count, null);
}
/// <summary>Undoes the last action performed, if any</summary>
public static void Undo()
{
if (!CanUndo)
{
return;
}
UndoableAction action = activitiesStack.Pop();
action.Undo();
redoStack.Push(action);
OnRedoAltered(redoStack.Count, action);
if (activitiesStack.Count == 0)
{
OnUndoAltered(activitiesStack.Count, null);
}
else
{
OnUndoAltered(activitiesStack.Count, activitiesStack.Peek());
}
}