public IMemento Restore()
{
// Before
drawableContainer.Invalidate();
AddElementMemento oldState = new AddElementMemento(surface, drawableContainer);
surface.AddElement(drawableContainer, false);
// After
drawableContainer.Invalidate();
return(oldState);
}
public IMemento Restore()
{
// Before
drawableContainer.Invalidate();
AddElementMemento oldState = new AddElementMemento(surface, drawableContainer);
surface.AddElement(drawableContainer, false);
// The container has a selected flag which represents the state at the moment it was deleted.
if (drawableContainer.Selected)
{
surface.SelectElement(drawableContainer);
}
// After
drawableContainer.Invalidate();
return(oldState);
}
