[mapguide-users] Update legend information on runtime

[Jackie Ng]

864 layers !!!??? o_O

If you want to avoid a full legend rebuild, then your shortcut functions
that do the layer/group toggling should return some kind of changeset JSON
structure that the legend widget can use to update affected parts.

So just to spitball an example from your sample server-side code, you could
return a JSON structure like this:

{
    "show": {
        "layers": [<list of object ids of layers to set visible>],
        "groups": [<list of object ids of groups to set visible>]
    },
    "hide": {
        "layers": [<list of object ids of layers to set hidden>],
        "groups": [<list of object ids of layers to set hidden>]
    }
}

You'd then have to modify the legend widget so that you can pass this
structure to it, and using this information, update the widget's internal
representation of your map's layer/group data to match.

- Jackie



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