public static void ChangeListWithHistory <T>(this IHistoryViewModel vm, IList <T> source, IList <T> oldValue, IList <T> newValue)
{
if (vm.History != null)
{
void undo() => source = oldValue;
void redo() => source = newValue;
vm.History.Snapshot(undo, redo);
source = newValue;
}
}
public static void RemoveWithHistory <T>(this IHistoryViewModel vm, IList <T> source, T item)
{
if (vm.History != null)
{
int index = source.IndexOf(item);
void redo() => source.RemoveAt(index);
void undo() => source.Insert(index, item);
vm.History.Snapshot(undo, redo);
redo();
}
}
public static void CreateSnapshot(this IHistoryViewModel vm, Action undo, Action redo)
{
vm.History?.Snapshot(undo, redo);
}
