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Drag Drop Not working properly

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TileView

This is a migrated thread and some comments may be shown as answers.

Snehal asked on 15 Jul 2010, 07:37 AM

tour.JPG

Hello Telerik Team,

For understanding my problem first please see attached file.

When am dragging Order (Order-09 in orderdetail tab of Tour 2) & dropping to Tour 3, am getting reference of Tour 1 instead of Tour 3. Am using Drag & Drop control of Telerik only. DropInfo am handling like below:

e.Options.Status = DragStatus.DropComplete Then

Dim row As RadTileViewItem = TryCast(e.Source, RadTileViewItem)
End IF

row am aspacting tour 3 content not Tour 1. This thing happens randomly and am not able to track when it gives me wrong reference.

Solution: if am maximized Tour 3 and again maximized tour 2. if now am dropping same then i am getting tour 3 row which i want.

One thing am doing is While TileStateChanged am checking if it is maximized item then Item Max Height/Width equals to Windows Max Height/Width other wise it restricted to 200 as am want some specific size of box.

Is that the reason or something else?

Thanks...!!!

12 Answers, 1 is accepted

answered on 16 Jul 2010, 06:22 AM

Hello Telerik team,

Instead of e.Source, I changed a logic to from CurrentDragPoint find the visual parent. but in that also am not able to find RadTileViewItem. can u please help me out for the same?

Am droping order to TileViewItem Area. row are always nothing even sometime elements also nothing.

If e.Options.Status = DragStatus.DropComplete Then

Dim elements = VisualTreeHelper.HitTest(rtvTour, e.Options.CurrentDragPoint)

            Dim row As RadTileViewItem = FindVisualParent(Of RadTileViewItem)(TryCast(elements.VisualHit,
                                                                                        FrameworkElement))

            If row IsNot Nothing
                 ' Do something
            End If

        End if

    Private Shared Function FindVisualParent(Of T As UIElement)(ByVal element As UIElement) As T
        Dim parent As UIElement = element
        While parent IsNot Nothing
            Dim correctlyTyped As T = TryCast(parent, T)
            If correctlyTyped IsNot Nothing Then
                Return correctlyTyped
            End If

parent = TryCast(VisualTreeHelper.GetParent(parent), UIElement)
End While

Return Nothing
End Function

Please do needful.... THanks...!!!

answered on 20 Jul 2010, 05:34 PM

dndinsidetileviewvb.zip

Hello Snehal,

In order to get the TileViewItem you can use the ParentOfType() method when the drop destination isn't the TileViewItem but an element or panel inside it. And then if the destination RadTileViewItem isn't Nothing, you can apply some custom logic for the drop operation.

Dim destination As RadTileViewItem = TryCast(e.Options.Destination, RadTileViewItem)

If destination Is Nothing Then

destination = e.Options.Destination.ParentOfType(Of RadTileViewItem)()

End If

If e.Options.Status = DragStatus.DropComplete AndAlso destination IsNot Nothing

Then

...

I prepared a sample project illustrating this approach. Please take a look at it and let me know if it works for you.

Best wishes,
Tina Stancheva
the Telerik team

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