[Users] enableDD between LayerContainer

[Julien-Samuel Lacroix]

Thanks a lot for this information!

Julien

Andreas Hocevar wrote:
> On 2010-03-04 02:21, Julien-Samuel Lacroix wrote:
>> What would be the best way to support the drag-n-drop of the layers in a 
>> TreePanel to change the layer positions, but between the LayerContainers.
>>
>> Is it to use LayerNodes instead of LayerContainer and code custom code 
>> to enable the drag-n-drop support?
>> Is it to modify the LayerContainer code to support drag-n-drop between 
>> containers? (Is it possible?)
>>   
> 
> You do not need to modify any code, it is already supported by the
> LayerNode.
> 
> Here is how to do it with LayerContainers: First of all, don't forget to
> set enableDD to true on the tree, and set allowDrag to false for all
> nodes that you don't want to drag (especially the container nodes
> themselves). What you then have to do is define a "beforemovenode"
> handler on the tree. The handler takes care of making sure that you
> change whatever you use for layer grouping (e.g. a layer record field
> called "group") so the layer can be added to the new container.
> 
> We have done this in the OpenGeo Suite's GeoExplorer. See [1] for the
> "beforemovenode" handler and [2] for the filter function that we use to
> populate the "background" group.
> 
> Regards,
> Andreas.
> 
> [1]
> http://projects.opengeo.org/suite/browser/trunk/geoexplorer/src/client/script/app/GeoExplorer.js?rev=654#L458
> 
> [2]
> http://projects.opengeo.org/suite/browser/trunk/geoexplorer/src/client/script/app/GeoExplorer.js?rev=654#L365
> 

-- 
Julien-Samuel Lacroix
Mapgears
http://www.mapgears.com/