procedure RequiredState(ReqState: TCanvasState); virtual; abstract;
virtual void __fastcall RequiredState(TCanvasState ReqState) = 0 ;
Changes the current state of the canvas to meet the given requirements.
Override RequiredState in descending classes. RequiredState ensures that a canvas meets a set of given requirements. If the requirements are not met, the canvas initializes its internal structures so that the requirements are met after the call to RequiredState is completed.