Question: How to prevent node from being dropped before another node at top level?

[kanli1984]

Is it possible to prevent node from being dropped before specific node at top level? This is possible for non-top level node since nextParent with latest state of children will be passed to canDrop callback. For top level node, nextParent is null and I can't figure way to get latest state of tree. Without latest state of tree, how can I tell in front of which node it's being dropped?

Example (How to prevent PF 1 and PF 2 from being dropped before SF 1 & SF 2?)

SF 1
--SF 1.1
----SF 1.1.1
SF 2
--SF 2.1
PF 1
PF 2

[wuweiweiwu]

Hi @kanli1984. I'm prettty sure nextParent is only going to be null at the top level so you can use that.

or you can also check nextPath and if its length 0 then that means its at top level.

hope that helps :)

[kanli1984]

I'm not trying to prevent dropping at top level in general. For instance dropping PF2 in front of PF1 is a valid operation. I want to only prevent user from dropping folder in front of any of the SF folder.

[wuweiweiwu]

@kanli1984 I see. current the canDrop call back doesn't support something like nextChildren

I'll probably get to it eventually but if you want to contribute this feature it'll be much appreciated!