MetroFramework.Controls.MetroScrollBar.OnMouseMove C# (CSharp) Method

        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);

            if (e.Button == MouseButtons.Left)
            {
                if (thumbClicked)
                {
                    int oldScrollValue = curValue;

                    int pos = metroOrientation == MetroScrollOrientation.Vertical ? e.Location.Y : e.Location.X;
                    int thumbSize = metroOrientation == MetroScrollOrientation.Vertical ? (pos / Height) / thumbHeight : (pos / Width) / thumbWidth;

                    if (pos <= (thumbTopLimit + thumbPosition))
                    {
                        ChangeThumbPosition(thumbTopLimit);
                        curValue = minimum;
                        Invalidate();
                    }
                    else if (pos >= (thumbBottomLimitTop + thumbPosition))
                    {
                        ChangeThumbPosition(thumbBottomLimitTop);
                        curValue = maximum;
                        Invalidate();
                    }
                    else
                    {
                        ChangeThumbPosition(pos - thumbPosition);

                        int pixelRange, thumbPos;

                        if (Orientation == MetroScrollOrientation.Vertical)
                        {
                            pixelRange = Height - thumbSize;
                            thumbPos = thumbRectangle.Y;
                        }
                        else
                        {
                            pixelRange = Width - thumbSize;
                            thumbPos = thumbRectangle.X;
                        }

                        float perc = 0f;

                        if (pixelRange != 0)
                        {
                            perc = (thumbPos)/(float) pixelRange;
                        }

                        curValue = Convert.ToInt32((perc * (maximum - minimum)) + minimum);
                    }

                    if (oldScrollValue != curValue)
                    {
                        OnScroll(ScrollEventType.ThumbTrack, oldScrollValue, curValue, scrollOrientation);
                        Refresh();
                    }
                }
            }
            else if (!ClientRectangle.Contains(e.Location))
            {
                ResetScrollStatus();
            }
            else if (e.Button == MouseButtons.None)
            {
                if (thumbRectangle.Contains(e.Location))
                {
                    Invalidate(thumbRectangle);
                }
                else if (ClientRectangle.Contains(e.Location))
                {
                    Invalidate();
                }
            }
        }