Remove DropVisual

2 posts, 0 answers
  1. Kieron
    Kieron avatar
    21 posts
    Member since:
    Nov 2013

    Posted 05 May 2016 Link to this post

    I have a listbox which the user can drag from and drop on a scheduleview.. however I've restricted the user so that they can't drop back onto the listbox and therefore they also can't re-order the listbox.

    To get this working was simple enough - however I had a bit of difficulty getting rid of the DropVisual that happens when you hover on the listbox with an item you are dragging.  (The visual I am talking about is the bar that appears above/below each listboxitem to indicate where it is going to drop - I want to get rid of this because the user can't drop here - I'm surprised its not supressed when AllowDrop is set to False).

    I tried setting the DropVisualProvider to null on the Listbox itself - this in turn caused loads of silent NullReferenceExceptions and caused flickering when holding an item over the ListBox.  I then set the DropVisualProvider to a class which inherited from LinearDropVisualProvider and overrode the CreateDropVisual method to just return a blank StackPanel - this works flawlessly, but is there an easier/less hacky way of achieving this?

  2. Masha
    Masha avatar
    355 posts

    Posted 09 May 2016 Link to this post

    Hello Kieron,

    In order to achieve the desired approach I suggest you overwrite LinerDropVisuslStyle as follow:

    <telerik:RadListBox Height="300" Width="200" ItemsSource="{Binding Cars}">
                 <Style TargetType="telerik:LinearDropVisual"  />

    I hope this would be helpful.

    Do you need help with upgrading your AJAX, WPF or WinForms project? Check the Telerik API Analyzer and share your thoughts.
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