Microsoft.VisualStudio.R.Package.DataInspect.MatrixView.VerticalScrollBar_Scroll C# (CSharp) Méthode

        private void VerticalScrollBar_Scroll(object sender, ScrollEventArgs e) {
            if (_scroller == null) {
                return;
            }

            switch (e.ScrollEventType) {
                // page up/down
                case ScrollEventType.LargeDecrement:
                    _scroller.EnqueueCommand(GridUpdateType.PageUp, 1);
                    break;
                case ScrollEventType.LargeIncrement:
                    _scroller.EnqueueCommand(GridUpdateType.PageDown, 1);
                    break;

                // line up/down
                case ScrollEventType.SmallDecrement:
                    _scroller.EnqueueCommand(GridUpdateType.LineUp, 1);
                    break;
                case ScrollEventType.SmallIncrement:
                    _scroller.EnqueueCommand(GridUpdateType.LineDown, 1);
                    break;

                // scroll to here
                case ScrollEventType.ThumbPosition:
                    _scroller.EnqueueCommand(GridUpdateType.SetVerticalOffset, ComputeVerticalOffset(e), ThumbTrack.None);
                    break;

                // thumb drag
                case ScrollEventType.ThumbTrack:
                    _scroller.EnqueueCommand(GridUpdateType.SetVerticalOffset, ComputeVerticalOffset(e), ThumbTrack.Track);
                    break;
                case ScrollEventType.EndScroll:
                    _scroller.EnqueueCommand(GridUpdateType.SetVerticalOffset, ComputeVerticalOffset(e), ThumbTrack.End);
                    break;

                // home/end (scroll to limit)
                case ScrollEventType.First:
                    _scroller.EnqueueCommand(GridUpdateType.SetVerticalOffset, ComputeVerticalOffset(e), ThumbTrack.None);
                    break;
                case ScrollEventType.Last:
                    _scroller.EnqueueCommand(GridUpdateType.SetVerticalOffset, ComputeVerticalOffset(e), ThumbTrack.None);
                    break;

                default:
                    break;
            }
        }