[Laszlo-dev] Fwd: [Laszlo-user] Drag and drop refresh issue using dhtml

[Chris Helgeson]

Begin forwarded message:

> From: Charles Watt <cwatt at racemi.com>
> Date: May 1, 2009 2:25:50 PM PDT
> To: laszlo-user at openlaszlo.org
> Subject: [Laszlo-user] Drag and drop refresh issue using dhtml
>
> After running into issues with the opttree component from the  
> incubator, I've extended the standard tree component to support drag  
> and drop to allow reordering of the tree.  I used the draglib  
> library with checkdragstate and basedragimage for the implementation.
> It works great in all versions of swf.  But with dhtml there is a  
> subtle bug -- and of course dhtml is technology in which we need to  
> deliver the code.  With dhtml, if tree items are moved to a  
> different branch of the tree, subsequent operations can be flakey.   
> The correct item will be dragged, but occasionally the wrong target  
> will be selected for the drop.  After some investigation it looks as  
> if the tracker implementing the drop does not refresh its view of  
> the tree layout.  When it tries to drop onto the Nth clone, it  
> selects the original Nth clone rather than the current.  However the  
> displayed tree looks correct and I've manually walked both the  
> hierarchy of clones and nodes and they both look correct.  Only the  
> tracker seems confused.
>
> I tried fixing this by unregistering all drop targets and then re- 
> registering them after moving a tree item.  But the tracker still  
> has the same, original view of the tree.
> Any suggestions on what I missed or how I might get the tracker  
> synched up with the current layout of the tree?
>
> Thanks!
> Charlie Watt
> Racemi

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