[OpenLayers-Dev] Layers into Groups

[Steven M. Ottens]

The mapbuilder code uses
//wmc:ResourceList/wmc:Layer[wmc:Extension/wmc:Group/@name=$GroupName]
So this means that it selects the layers which have a group-extension. I 
believe the structure is hierarchical, so using group/layer approach 
should be consistent with the OWS spec.
But I'm not the real expert, I though gertjan did the grouping code, but 
could be wrong.

Steven

Cameron Shorter wrote:
> Grouping layers has been discussed a few time on the Mapbuilder list, in 
> particular including Grouping in the OWS Spec.
> It would be good to confirm that your grouping code is consistent with 
> Mapbuilder and OWS Context to ease future integration issues.
> I think Steven is probably the expert in this area.
>
> Lorenzo Becchi wrote:
>   
>> Cool Jachym.
>>
>> that's a good idea.
>> It can even represent the complete structure of a WMS GetCapabilites 
>> (read: WMS Manager [1]).
>>
>> At the code sprint in Victoria, we where talking with Chris about the 
>> possibility to add few features to LayerSwticher. This could be one.
>> other possible attribute wired features:
>> - "buttonDropLayer" : true //activate a button to let the user drop the 
>> layer from map and layerSwitcher
>> - "buttonZoom2Extent" : true //show a button to zoom to layer extent
>> - "buttonOpacity" : true //show two buttons change layer opacity
>> - "buttonMoveLayer" : true //show two buttons to move layers up or down 
>> in the overlay list (this could collide with your structure)
>>
>> this are the buttons that could apply to all type of layers.
>> button could be just a div where all styles are defined inside the CSS.
>>
>> if you and others agree we can expand your Ticket or make another that 
>> can manage all points. Or make a lots of tickets...
>> ciao
>> Lorenzo
>>
>> ps: btw, your patch doesn't work on Safari 2.
>>
>> [1] *http://tinyurl.com/2fjbr7*
>>
>>
>>
>> Jachym Cepicky wrote:
>>   
>>     
>>> Hi developers,
>>> I have implemented ordering map layers into groups [1]. You have to
>>> specify new layer attribute group:"Group Name", e.g.:
>>>
>>>  var dm = new OpenLayers.Layer.WMS( "DM Solutions Transit",
>>>                 "http://www2.dmsolutions.ca/cgi-bin/mswms_gmap",
>>>                 {layers: "rail,road",
>>>                  transparent: "true", format: "image/png"
>>>                 },
>>>                 {                 
>>>                   group:"Transit"
>>>                 });
>>>
>>> You can define group hierarchy using "/" mark:
>>>
>>> ....
>>> group: "Transit/Roads"
>>> ....
>>>
>>> Only changed file is LayerSwitcher.js
>>>
>>> For example see [2]
>>>
>>> Hope, you'll like it
>>>
>>> Jachym
>>>
>>> [1] http://trac.openlayers.org/ticket/1086
>>> [2]
>>> http://dev.openlayers.org/sandbox/jachym/openlayers/examples/layer-groups.html
>>>   
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