topic Re: Problem with visibility of layers in legend in ArcGIS API for Silverlight Questions

Problem with visibility of layers in legend

AnatoliiTerentiev — Mon, 10 Feb 2014 11:28:56 GMT

Dear Gurus!
I began working with the API and ran into a problem. In ESRIStandardMapApplication I replaced topo layer with my own topo layer. And visibility of the layers when run the program does not match the visibility of layers in the map , which I publish. How to fix the problem?
P.S. Switching visibility of layers with the help of checkboxes in the legend tree work normally after that.

xaml:

<esri:Legend x:Name="Legend" Map="{Binding ElementName=Map}" ShowOnlyVisibleLayers="False" Refreshed="Legend_Refreshed" LayerItemsMode="Tree" Style="{StaticResource LegendStyle1}" LayerTemplate="{StaticResource My_LayerTemplate}" />

In Legend_Refreshed I only work with expanded property.

Re: Problem with visibility of layers in legend

AnatoliiTerentiev — Tue, 11 Feb 2014 03:32:26 GMT

P.S. In ArcGIS REST Services Directory all published raster layers has -

Default Visibility: true

Re: Problem with visibility of layers in legend

AnatoliiTerentiev — Tue, 11 Feb 2014 06:03:48 GMT

I thought that the visibility of the property associated with Layer.Visible map layer, but it turned out that it is associated with the property layerItemVM.IsEnabled. I solved the problem by replacing

[HTML]<CheckBox Content="{Binding Label}" IsChecked="{Binding IsEnabled, Mode=TwoWay}"/>[/HTML]
on this
[HTML]<CheckBox Content="{Binding Label}" IsChecked="{Binding Layer.Visible, Mode=TwoWay}"/>[/HTML]
in LayerItemTemplate:
[HTML]<DataTemplate x:Key="My_LayerTemplate">
<StackPanel Orientation="Horizontal">
<CheckBox Content="{Binding Label}" IsChecked="{Binding IsEnabled, Mode=TwoWay}"/>
</StackPanel>
</DataTemplate>[/HTML]

Can't anybody say where I can read about how layerItemVM.IsEnabled formed from the map layers properties?

Re: Problem with visibility of layers in legend

DominiqueBroux — Wed, 12 Feb 2014 13:16:07 GMT

Can't anybody say where I can read about how layerItemVM.IsEnabled formed from the map layers properties?

For a layer, layerItemVM.IsEnabled represents the layer.Visible property so "{Binding IsEnabled, Mode=TwoWay}" should be equivalent to "{Binding Layer.Visible, Mode=TwoWay}" for the layers.
However layerItemVM.IsEnabled is more generic since it can manage the sublayer visibility as well (for the layer that supports changing the sublayer visibilities such as a non cached ArcGISDynamicMapServiceLayer).

In case your layer doesn't support changing sublayer visibilities (e.g an ArcGISTiledMapServiceLayer), changing layerItemVM.IsEnabled has no effect while changing Layer.Visible toggles the whole layer visibility i.e the visibility of all sublayers.