Gets the layout currently being rendered using @renderer.
Calling this function only makes sense from inside a subclass's
methods, like in its draw_shape<!---->() for example.
The returned layout should not be modified while still being
rendered.
Return: the layout, or %NULL if
no layout is being rendered using @renderer at this time.
Gets the layout currently being rendered using @renderer. Calling this function only makes sense from inside a subclass's methods, like in its draw_shape<!---->() for example.
The returned layout should not be modified while still being rendered.
Return: the layout, or %NULL if no layout is being rendered using @renderer at this time.