Hi Patrick,
The observed behavior can be considered an issue and I have logged it on our
feedback portal, here:
FIX. RadListView - dragging an item from one list view to another can result in incorrect scrolling of the source list view when it is not necessary. I have also updated your
Telerik points. We will do our best to include the fix of the issue in the R1 2019 release. A possible workaround is to use the custom drag-drop service below:
public partial class RadForm1 : Telerik.WinControls.UI.RadForm
{
public RadForm1()
{
InitializeComponent();
this.radListView1.AllowDragDrop = true;
this.radListView2.AllowDragDrop = true;
this.radListView1.ListViewElement.DragDropService = new CustomListViewDragDropService(this.radListView1.ListViewElement);
this.radListView2.ListViewElement.DragDropService = new CustomListViewDragDropService(this.radListView2.ListViewElement);
}
}
public class CustomListViewDragDropService : ListViewDragDropService
{
public CustomListViewDragDropService(RadListViewElement owner)
: base(owner)
{ }
protected override void HandleMouseMove(Point mousePos)
{
int? scroll = null;
SimpleListViewVisualItem item = this.DropTarget as SimpleListViewVisualItem;
if (item != null && item.Data.Owner != this.Owner)
{
scroll = this.Owner.ViewElement.VScrollBar.Value;
Point clientPos = item.Data.Owner.ViewElement.PointFromScreen(mousePos);
if ((clientPos.Y < 0 && item.Data.Owner.ViewElement.Orientation == Orientation.Vertical) ||
(clientPos.X < 0 && item.Data.Owner.ViewElement.Orientation == Orientation.Horizontal))
{
item.Data.Owner.ViewElement.Scroller.Scrollbar.PerformSmallDecrement(1);
}
else if ((clientPos.Y > item.Data.Owner.Size.Height && item.Data.Owner.ViewElement.Orientation == Orientation.Vertical) ||
(clientPos.X > item.Data.Owner.Size.Width && item.Data.Owner.ViewElement.Orientation == Orientation.Horizontal))
{
item.Data.Owner.ViewElement.Scroller.Scrollbar.PerformSmallIncrement(1);
}
}
base.HandleMouseMove(mousePos);
if (scroll.HasValue)
{
this.Owner.ViewElement.VScrollBar.Value = (int)scroll;
}
}
}
I hope this helps. Let me know if you need further assistance.
Regards,
Hristo
Progress Telerik
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