question: private void beginGesture ( int scrollOffsetY , int scrollExtentY ) { mInitialTranslationY = getTranslationY ( ) ; boolean isInitiallyVisible = mInitialTranslationY < mTotalHeight ; int startingY = isInitiallyVisible ? scrollOffsetY : Math . min ( scrollOffsetY , mTotalHeight ) ; mInitialOffsetY = startingY + scrollExtentY ; }
target:  Records the conditions of the page when a gesture is initiated.