[mapguide-trac] #1023: Low perfomace while generating legend

[MapGuide Open Source]

#1023: Low perfomace while generating legend
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   Reporter:  liuar    |       Owner:  Arthur Liu
       Type:  defect   |      Status:  new       
   Priority:  medium   |   Milestone:            
  Component:  General  |     Version:  2.0.2     
   Severity:  major    |    Keywords:            
External_id:  1236462  |  
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 A customer who has a map with 700+ layers. Currently each layer sends
 request to generate legend even if it’s hidden or disabled. The legend
 should be generated on demand to improve performance.

 Expect: The legend generated dynamically, so the map author could improve
 the performace by well organized groups.

 1. For the layers which are not displayed in the legend, browser should
 not send requests to generate legend images.
 2. If the user expand a group, then the request will be sent out to
 generate the legend images for the layers in that group.
 3. If a layer's legend image is requested, browser will not send requests
 unless the legend image has been changed due to the scale changing.

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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/1023>
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