topic Re: Get opacity of layers in Legend control in ArcGIS API for Silverlight Questions

Get opacity of layers in Legend control

MiriEshel — Tue, 30 Apr 2013 05:56:52 GMT

Hi everybody,

I'm using a legend that looks like this:

<esri:Legend x:Name="Legend"
                                         LayerIDs="USAID_Layers"
                                         LayerItemsMode="Tree"
                                         Map="{Binding ElementName=Map}"
                                         Refreshed="Legend_Refreshed"
                                         ShowOnlyVisibleLayers="True">
                                <esri:Legend.LegendItemTemplate>
                                    <DataTemplate>
                                        <StackPanel Margin="0,-3" Orientation="Horizontal">
                                            <Image MinWidth="20"
                                                   Margin="0,-1"
                                                   HorizontalAlignment="Center"
                                                   VerticalAlignment="Center"
                                                   Source="{Binding ImageSource}"
                                                   Stretch="None" />
                                            <TextBlock MinWidth="80"
                                                       Margin="5,0"
                                                       VerticalAlignment="Center"
                                                       Text="{Binding Label}" />
                                        </StackPanel>
                                    </DataTemplate>
                                </esri:Legend.LegendItemTemplate>
                            </esri:Legend>

One of the layer has opacity (defined in the mxd).
This layer looks good on the map (the brown and yellow polygons) but it is solid (has no opacity) in the legend.
See attached files.

Is there any binding that I can do in order to get the opacity of the layer from the mxd?

Thanks a lot.
Miri

Re: Get opacity of layers in Legend control

Anonymous User — Sat, 11 Dec 2021 10:06:56 GMT

Original User: dbroux

You can redefine the LegendItemTemplate of the legend and bind the swatch opacity to the layer opacity.Something like:

<esri:Legend.LegendItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Horizontal">
            <Image MinWidth="20" HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                      Opacity="{Binding Path=DataContext.Layer.Opacity,
                                        RelativeSource={RelativeSource AncestorType=esriToolkitPrimitives:TreeViewItemExtended,
                                                                    AncestorLevel=2}}" 
                     Source="{Binding ImageSource}"
                    Stretch="None" />
            <TextBlock Margin="5,0,0,0" VerticalAlignment="Center" Text="{Binding Label}" />
        </StackPanel>
    </DataTemplate>
</esri:Legend.LegendItemTemplate>

Re: Get opacity of layers in Legend control

MiriEshel — Tue, 14 May 2013 09:09:16 GMT

Hi Dominique,

Thank you for your help.

I've tried what you have suggested but unfortunately it does not help. What you've suggested is related to ArcGISDynamicMapServiceLayer as a whole, so if I do:
             <esri:ArcGISDynamicMapServiceLayer ID="USAID_Layers"
                                                       Initialized="ArcGISDynamicMapServiceLayer_Initialized"
                                                       Opacity="0.3" DisableClientCaching="True"
                                                        />
I will see the legend of all layers ,in the legend of the ArcGISDynamicMapServiceLayer, transparent.
The thing is that I'm interested in individual layers within the ArcGISDynamicMapServiceLayer (few polygon layers) that will be transparent (with opacity). I thought that if I will define these layers transparent in the MXD and publish it, it will look the same in the legend of the application but it doesn't.
As a result, Esri opened a NIM for that :Bug ID: # NIM091488
Synopsis Transparency of Legends/TOC not honored in Map Service

The ArcGISDynamicMapServiceLayer exposes very few details for each individual layer in the service - minScale, maxScale, name, subLayersID, defaultVisibility (you can see in the attached file) so I cannot grab the opacity.

Thanks a lot,
Miri

Re: Get opacity of layers in Legend control

Anonymous User — Fri, 15 Nov 2013 12:14:01 GMT

Original User: aafgilbert01

Hello,

I would like to know if the issue of enabling opacity in the color box in the esri:legend has been resolved in the last release. If it has been solved, I would like to have also a sample code of the XAML to write the opacity binding with the layer.

Regards

Re: Get opacity of layers in Legend control

FrancoisGilbert — Mon, 25 Nov 2013 16:23:22 GMT

Is there any news regarding Bug ID: # NIM091488

Has this been adressed in the latest ArcGis Runtime platform.

Regards

Re: Get opacity of layers in Legend control

Anonymous User — Thu, 28 Nov 2013 08:02:18 GMT

Original User: miri

Hi Francois,

As far as I know, it is solved in 10.2.
With which ArcGIS Server version are you working?

Miri