Not answered Drag/Drop within a ListBox

 I suggest you to check our official demo for more info:
http://demos.telerik.com/silverlight/#DragAndDrop/TreeToGrid

Hello Telerik team,
Thanks for the reply. I have already looked at this example but it doesn't reorder the listBox item. It has a treeview, Grid, and a list box.

• When we try to Drag and drop  listBoxitems in between List Box, it just remove from the dragged location and adds at the end.
• When we drag from Treeview or Grid into ListBox, again it addes at the end not at dropped location. Following is the line of code that I got from the source code of the link you sent me.

  •  

     

    foreach (object draggedItem in draggedItems)

     

    {

    items.Add(draggedItem);  -- It insert at the end

    }

  • The old zip file works great (2009). It insert at the dropped location having following codes.

  •    

     

     

    var operation = e.Options.Payload as DragDropOperation;

     

     

    var insertIndex = operation.DropPosition == DropPosition.Before ? destinationIndex : destinationIndex + 1;

     

    itemsSource.Insert(insertIndex, operation.Payload);

  • I am not able to convert this  codes with new assembly. Please help asap as I have demo in a day or two.

Thanks & regards,
Andy Singh

 I have prepared sample project (SilverlightApplication8) that demonstrate how you can achieve this out of the box using our build in behavior. (Please, note that you need to use one of our recent LIBs to work). More information about drag behaviors can be found here. 

However, if you need more custom solution, I have modified the initial project to fit the latest version (SL4 and Q2 SP1 telerik binaries). Please, find the attached project - SilverlightApplication9.

Let us know if you have any further questions or issues.

•  Drop from one list box into other at desired location.
• Reorder the individual List box.

How can I send this project to you. I am not able to upload it. Only image files are enabled..
BTW here is the .DropInfo Event where I want the fix.

private void DropInfo(object sender, DragDropEventArgs e)

{

System.Windows.Controls.

ItemsControl wishlist = e.Options.Destination as System.Windows.Controls.ItemsControl;

ICollection draggedItems = e.Options.Payload as ICollection;

// Get the drag cu that the TreeView or we have created

TreeViewDragCue cue = e.Options.DragCue

as TreeViewDragCue;

if (e.Options.Status == DragStatus.DropPossible)

{

// Set a suitable text:

cue.DragActionContent =

String.Format("Add {0} item{1} to Wishlist", draggedItems.Count, draggedItems.Count > 1 ? "s" : String.Empty);

cue.IsDropPossible =

true;

// wishlist.Background = this.Resources["BasicBrush"] as Brush;

}

else if (e.Options.Status == DragStatus.DropImpossible)

{

cue.DragActionContent =

null;

cue.IsDropPossible =

false;

}

else if (e.Options.Status == DragStatus.DropComplete && e.Options.Destination is ListBox)

{

System.Windows.Controls.

ListBox listBoxSender = sender as System.Windows.Controls.ListBox;

IList items = wishlist.ItemsSource as IList;

IList<MachineScheduleViewModel> itemsSource = wishlist.ItemsSource as IList<MachineScheduleViewModel>;

foreach (object draggedItem in draggedItems)

{

//Problem

var destinationIndex = 2;// itemsSource.IndexOf((MachineScheduleViewModel)wishlist.DataContext);

var operation = draggedItem as DragDropOperation;

// var operation = e.Options.Payload as DragDropOperation;

//Problem here ****************************************************************************

// How can I get the actual insert Index... I have hard coded index = 2 and the dragged items are

// getting inserted there at idex 2.

var insertIndex =0;

if(itemsSource.Count > 2)

insertIndex = 2;

// operation.DropPosition == DropPosition.Before ? destinationIndex : destinationIndex + 1;

else

insertIndex = itemsSource.Count;

// Please fix this so that I can get the actual index ****************

itemsSource.Insert(insertIndex, (

MachineScheduleViewModel)draggedItem);

ListBox listBox = (ListBox)wishlist;

listBox.Dispatcher.BeginInvoke(() =>

{

listBox.SelectedIndex = insertIndex;

});

// items.Add(draggedItem); //original

}

}

if (e.Options.Status != DragStatus.DropPossible)

{

wishlist.Background =

new SolidColorBrush(Colors.White);

}

}

 You can attach project by opening support ticket. I encourage you to do so. that way we will be able to update it and provide solution in the specific case. Also, keep in mind that support tickets response time is shorter, so you will be able to receive response faster.