Olag,

> Before
> Record 1 prio 3
> Record 2 prio 10
> Record 3 prio 18
> Record 4 prio 20
> Record 5 prio 30
>
> The user set the record 4 to prio 15, I would like to do this:
>
> Record 1 from 3 to 10
> Record 2 from 10 to 20
> Record 3 from 20 (should 15, Destination between record 2 and record 3)) to
> 30
> Record 4 to 40
> Record 5 to 50

You example is confusing.

If a user can never change the position of Record 4 ahead of Record 3 (as is the case in your example) what purpose does priority serve.

If you had said that the outcome you wanted was:

Record 1 from 3 to 10
Record 2 from 10 to 20
Record 4 to 30 <-*********
Record 3 from 20 (should 15, Destination between record 2 and record 3)) to 40 <-*********
Record 5 to 50

Then that would have made sense.

Please clarify, the problem domain does matter to the solution.


Sean