Hello,
I've got two RadListViews with dragdrop functionality enabled (using DragDropService).
Both Listviews have more items in the list (vertical scrollbar enabled)
When I want to drag one item from the source Listview to the target Listview, and dragging the item to the upper/lower bound of the target Listview, the source listview starts scrolling instead of the target listview (see this movie).
Is it possible (and if possible, how can I accomplish) to NOT scroll the source listview but DO scroll the target listview?
Best regards
Patrick Vossen
2 Answers, 1 is accepted
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Accepted
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:
I hope this helps. Let me know if you need further assistance.
Regards,
Hristo
Progress Telerik
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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Patrick
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answered on 23 Nov 2018, 11:29 AM
Hi Hristo,
Thanks for your solution.
Regards
Patrick Vossen