question: @ Override public void onDraw ( ) { if ( mIsControllerAttached ) { return ; } if ( ! mTrimmed ) { FLog . wtf ( DraweeEventTracker . class , "%x: Draw requested for a non-attached controller %x. %s" , System . identityHashCode ( this ) , System . identityHashCode ( mController ) , toString ( ) ) ; } mTrimmed = false ; mIsHolderAttached = true ; mIsVisible = true ; attachOrDetachController ( ) ; }
target:  Callback used to notify about top-level-drawable being drawn.