How to: Prohibit Dropping to a Group

• Nov 13, 2018

The sample code below represents a NavBarControl.NavDragOver event handler. The event handler prohibits dropping to all but the last item in the group. The target group is identified via the NavBarDragDropEventArgs.Group property of the event’s parameter. The dropping position is obtained via the NavBarDragDropEventArgs.InsertPosition property.

C#

using DevExpress.XtraNavBar;
using DevExpress.XtraNavBar.ViewInfo;

private void navBarControl1_NavDragOver(object sender, NavBarDragDropEventArgs e) {
   NavBarGroup targetGroup  = e.Group;
   if (e.InsertPosition != targetGroup.VisibleItemLinks.Count) {
      e.Effect = DragDropEffects.None;
   }
}

VB.NET

Imports DevExpress.XtraNavBar
Imports DevExpress.XtraNavBar.ViewInfo

Private Sub NavBarControl1_NavDragOver(ByVal sender As Object, _
  ByVal e As NavBarDragDropEventArgs) Handles NavBarControl1.NavDragOver
   Dim TargetGroup As NavBarGroup = e.Group
   If e.InsertPosition <> TargetGroup.VisibleItemLinks.Count Then
      e.Effect = DragDropEffects.None
   End If
End Sub