question: static RepaintManager currentManager ( AppContext appContext ) { RepaintManager rm = ( RepaintManager ) appContext . get ( repaintManagerKey ) ; if ( rm == null ) { rm = new RepaintManager ( BUFFER_STRATEGY_TYPE ) ; appContext . put ( repaintManagerKey , rm ) ; } return rm ; }
target:  Returns the RepaintManager for the specified AppContext.  If a RepaintManager has not been created for the specified AppContext this will return null.