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RadListBox & DragDrop

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ComboBox and ListBox (obsolete as of Q2 2010)
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Pieter
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Pieter asked on 03 Oct 2008, 09:55 AM

In my solution I had RadControls 2007 and I can drag an item from a RadList box, to a RadTextbox

After the upgrade to RadControls 2008 Q2 – the behaviour is a bit funny...

If I use the MouseDown  event

private void lstAlertTokens_MouseEnter(object sender, MouseEventArgs e)

        {

            if (lstAlertTokens.SelectedIndex >= 0)

            {

                string text = lstAlertTokens.Text;

                lstAlertTokens.DoDragDrop(text, DragDropEffects.Copy);

            }

        }

 The Drag and drops works, but when I click on items in the list, they are not selected (highlighted), I must use the up/down keyboard keys to first select the item I want, before I drag and drop it.

If I use the mouseUp event

 The item selection works now (gets highlighted) when I click the mouse , but the DragDrop effect icon is missing.. So the drag and drop works, but you don’t see the  DragDropEffects.Copy effect.

 

Any ideas?

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Martin Vasilev
Telerik team
answered on 03 Oct 2008, 02:36 PM
Hi Pieter,

Thank you for writing.

I have not managed to reproduce the described issues locally. Please, send me a small example application that demonstrates them. It will help me to understand your specific case and provide you with further assistance.
 
I am looking forward to your project.
 

Best wishes,
Martin Vasilev
the Telerik team

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Pieter
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answered on 06 Oct 2008, 10:00 AM
Hi Martin,

Atatched is a sample project.

Just cut/paste the mouseUp & mouseDown code to see the different effects.

Regards,
Pieter
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Martin Vasilev
Telerik team
answered on 06 Oct 2008, 04:23 PM
Hello Pieter,

Thank you for the project.

The described behavior is because you do not have a full implementation of the Drag-and-Drop scenario. You have to handle some additional events to make the DoDragAndDrop method work properly. Please, review your modified project that have been attached to this message.

I hope this helps. Because this case is very typical, I think it will be a good idea to move this support ticket with the example project to our public forums. Please let me know your opinion about that..
 

Greetings,
Martin Vasilev
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Pieter
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answered on 07 Oct 2008, 07:40 AM

Hi Martin,

Thanks for providing the code for those additional event handlers! The behaviour is now correct on my side.

I think it’s a very good Idea on moving the content to public forums! – Will you move the article, or is there something I must do?

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ComboBox and ListBox (obsolete as of Q2 2010)
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Pieter
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Martin Vasilev
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Pieter
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