allow or disable drop depending on source listBox

[Olivier Constance]

Hello

I have a windows with 4 radListBox.

this 4 rad listbox are binded to 4 Observable collection of the same Object type.

so i have radlist box A, B, C and D

what i want is :

 allow drag and drop
-betwen A and B (any directtion)
-between C and D (any direction)

disable drag and drop for all other posssibilities
-between B and C
-between B and D
-between A and C
-between A and D

i had already achieve this with radList box containing different type of Object by testing the type, but here i can't do it because all the radListBox contains the same type of object.

Any suggestion?

[Kalin]

Hi Olivier,

What I can suggest you would be to divide the ListBoxes logically into two groups between which the drag drop will be possible. Afterwards you will need to implement a custom ListBoxDragDropBehavior with one public property that will contain the group name and a static field that will contain the group name from which the drag operation has started. You will have override the CanStartDrag method in order to set the static field and the CanDrop method in order to check whether the current group is the starting one. For your convenience I have prepared a sample project which demonstrates the exact approach.

Hope this will work for you.

Regards,
Kalin
Telerik

 

 

[Olivier Constance]

That's exactly what i was looking for.

Thank you very much Kalin.