Be.Windows.Forms.HexBox.UpdateScrollSize C# (CSharp) Method

        void UpdateScrollSize()
        {
            //System.Diagnostics.Debug.WriteLine("UpdateScrollSize()", "HexBox");

            // calc scroll bar info
            if (VScrollBarVisible && _byteProvider != null && _byteProvider.Length > 0 && _iHexMaxHBytes != 0)
            {
                long scrollmax = (long)Math.Ceiling((_byteProvider.Length + 1) / (double)_iHexMaxHBytes - _iHexMaxVBytes);
                scrollmax = Math.Max(0, scrollmax);

                long scrollpos = _startByte / _iHexMaxHBytes;

                if (scrollmax < _scrollVmax)
                {
                    /* Data size has been decreased. */
                    if (_scrollVpos == _scrollVmax)
                        /* Scroll one line up if we at bottom. */
                        PerformScrollLineUp();
                }

                if (scrollmax == _scrollVmax && scrollpos == _scrollVpos)
                    return;

                _scrollVmin = 0;
                _scrollVmax = scrollmax;
                _scrollVpos = Math.Min(scrollpos, scrollmax);
                UpdateVScroll();
            }
            else if (VScrollBarVisible)
            {
                // disable scroll bar
                _scrollVmin = 0;
                _scrollVmax = 0;
                _scrollVpos = 0;
                UpdateVScroll();
            }
        }