Locked canvas is kind of a container for drawingml shapes: it can even contain group shapes.
LockedCanvasContext(oox::core::FragmentHandler2 const &rParent)
oox::core::ContextHandlerRef onCreateContext(sal_Int32 nElementToken, const ::oox::AttributeList &rAttribs) override
const oox::drawingml::ShapePtr & getShape() const
oox::drawingml::ShapePtr mpShapePtr
~LockedCanvasContext() override