topic Re: ESRI TOC Control in ArcGIS API for Silverlight Questions

ESRI TOC Control

RobertBrodsky — Tue, 26 Jul 2011 13:59:26 GMT

Hi All;
I am using the TOC control in my application and need to chance which layer is active or inactive programmatically. Any ideas?

Thank you in advance.

Re: ESRI TOC Control

JenniferNery — Tue, 26 Jul 2011 16:51:46 GMT

What do you mean by which layer is active? Do you mean visible or which layer received a mouse event? Layer.Visible property might be what you are looking for: http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.Layer~Visible.html.

What TOC control are you using? Do you mean legend control? http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LegendSimple

Re: ESRI TOC Control

AnastasiaAourik — Thu, 04 Aug 2011 21:21:15 GMT

Is there a way to use the legendcontrol that nicely synchronizes with map layers visibility
BUT omit the symbology....
Thus, making it a simple list of layers with the checkbox?

Re: ESRI TOC Control

DominiqueBroux — Fri, 05 Aug 2011 06:57:44 GMT

You can remove the swatches of the legend just by setting LegendItemTemplate to null (i.e in XAML LegendItemTemplate="{x:Null}").

Then you can change LayerItemTemplate and MapLayerItemTemplate to get checkboxes as in this sample : http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#LegendWithTemplates

Re: ESRI TOC Control

AnastasiaAourik — Fri, 05 Aug 2011 12:22:27 GMT

Thank You so VERY MUCH....
That really helped get me started.

A couple of funky things...

I.
In xaml I specify LayerIDs="wellsgeneral,bitatg,completions,danddm,dtandr"
And the VS2010 intellisense give me message:
Unable to cast object of type 'Microsoft.Expression,DesignModel,DocumentModel.DocumentPrimitiveNode to type
Microsoft.Expression.DesignModel,DocumentModel.DocumentCompositeNode'.

The sample you specified lists layer ids this way. What can I do to fix this?

II.
In my scenario, I have many in each map layer
some features that are 'labels and have the name Label in it
(poor map design that I cannot change right now)
So I have to skip those layers and am using the code behind logic
Legend_refreshed where 'states' was removed (in the online sample)
I changed it to
if (layerItemVM.Label.ToUpper().Contains("LABEL"))
removeLayerItemVM = layerItemVM;

Is this correct?

Re: ESRI TOC Control

DominiqueBroux — Sun, 12 Dec 2021 02:52:07 GMT

Unable to cast object of type 'Microsoft.Expression,DesignModel,DocumentModel.DocumentPrimitiveNode to type
Microsoft.Expression.DesignModel,DocumentModel.DocumentCompositeNode'.

The sample you specified lists layer ids this way. What can I do to fix this?

It is a known design issue but you can compile an run though.

I changed it to
if (layerItemVM.Label.ToUpper().Contains("LABEL"))
removeLayerItemVM = layerItemVM;

Is this correct?

Looks good 🙂
Except if you can have more than one layer to delete by service. In this case you need to store the items to delete in a list:

if (e.LayerItem.LayerItems != null)
{
  var toDelete = e.LayerItem.LayerItems.Where(item => item.Label.ToUpper().Contains("LABEL")).ToList();
  foreach (var item in toDelete)
    e.LayerItem.LayerItems.Remove(item);
}

Re: ESRI TOC Control

AnastasiaAourik — Fri, 05 Aug 2011 14:50:35 GMT

Thank you so much...

I actually loaded the ids in the code behnd, after all map layers completed initializing...

            string[] layerIDs = { "wellsgeneral", "bitatg", "completion", "onetrax", "dandm", "dtandr" };
            this.googWellLayerList.LayerIDs = layerIDs;
            this.googWellLayerList.Refreshed += new EventHandler<Legend.RefreshedEventArgs>(googWellLayerList_Refreshed);
            this.googWellLayerList.Refresh();

Now, my only issue was that CheckBox_Clicked event that I had in my xaml on the Legend.LayerTemplate (see event)
                                    <esri:Legend.LayerTemplate>
                                        <DataTemplate>
                                            <CheckBox Content="{Binding Label}" IsChecked="{Binding IsEnabled, Mode=TwoWay}" Checked="CheckBox_Checked" />
                                        </DataTemplate>
                                    </esri:Legend.LayerTemplate>

KEPT getting fired before initiatialization was and the above googWellLayerList.Refresh() was arrived at. So I just added a global bool to my application islegendrefresh = false, and I set it to true
after I finish the refreshed event logic.

In my checkbox_click event I had to cancel out if !islegendrefresh to prevent checkbox action occurring before I'm ready...

ANY WAY, YOU HAVE HELPED ALOT!
I was struggling with implementing this using my own listbox and keeping everyththing in sync with
visiblelayerslist via a custom LayerInfo : INotifyPropertyChanged...
I have alot to learn about advanced binding and notifications...

This Legend automatically does this for me.

Re: ESRI TOC Control

AnastasiaAourik — Fri, 05 Aug 2011 15:15:00 GMT

BTW, I was hoping you can share information on the best way to change the name of the Label
that is bound to the checkbox content...
(see my xaml code)
<esri:Legend.LayerTemplate>
<DataTemplate>
    <CheckBox Content="{Binding Label}" IsChecked="{Binding IsEnabled, Mode=TwoWay}" Checked="CheckBox_Checked" />
</DataTemplate>
</esri:Legend.LayerTemplate>
(see attached legend - the names are the internal map services names) - I'd like to give them some nice display names without messing with the binding behavior....

Re: ESRI TOC Control

DominiqueBroux — Fri, 05 Aug 2011 17:07:22 GMT

Glad that helped you:)

A few more infos:

string[] layerIDs = { "wellsgeneral", "bitatg", "completion", "onetrax", "dandm", "dtandr" };
this.googWellLayerList.LayerIDs = layerIDs;
this.googWellLayerList.Refreshed += new EventHandler<Legend.RefreshedEventArgs>(googWellLayerList_Refreshed);
this.googWellLayerList.Refresh();

Refresh() is not useful, it will be done automatically when you set the LayerIDS.

<CheckBox Content="{Binding Label}" IsChecked="{Binding IsEnabled, Mode=TwoWay}" Checked="CheckBox_Checked" />

Not sure what you do on event CheckBox_Checked but the binding should be enough to manage the layers on/off.

I'd like to give them some nice display names without messing with the binding behavior....

You can use a binding with a converter or set the labels by code in event refreshed.

Re: ESRI TOC Control

AnastasiaAourik — Fri, 05 Aug 2011 19:42:31 GMT

Thanks, I got that Value Converter now working beautifully.

On my checkbox, I have some extra things to do.

I have another layer (A feature layer of the same item as the map service layer that I have an ONDEMAND MAPTIP that I need to always turn on/off when layer is turned on off..

I now have all this working correctly, very nice.
===========================================

On another subject (probably should open a separate thread) I have issues with the
featurelayer in xaml it is hard to specify symbology, especially if it uses a complex expression based renderer - muche easier to use the symbology from the map service, but then I want to have the on demand map tips, so I have found it easier to have the map services layer using symbology from the map service, and a feature layer (pointing to the same map services layer id
with a null symbology but with the on demand map tip.
Do you know if I am mistaken in my thinking on this???

The other thing, I'd like to also bind Layer.Description or Description (see my xaml)
<esri:Legend.MapLayerTemplate>
<DataTemplate>
     <StackPanel Orientation="Vertical" ToolTipService.ToolTip="{Binding Layer.Description, Mode=OneWay}">
        <sdk:Label Content="{Binding Label, Converter={StaticResource MapSvcNameConverter}}" />
        <StackPanel Orientation="Horizontal">
           <sdk:Label Content="Layer Transparency" Margin="2,0,4,0" FontSize="9" FontWeight="Light" Foreground="DarkGray"/>
           <Slider Maximum="1" Value="{Binding Layer.Opacity, Mode=TwoWay}" Width="100" />
        </StackPanel>
     </StackPanel>
</DataTemplate>
</esri:Legend.MapLayerTemplate>

None of these work. In debugging, I also notice that Description is never populated.
I see it in the arcgis/rest/services reference but this does not get populated..
Note: I was debugging the legend refresh event handler and perusing the e.LayerItem
to try and find Description with my value....
Do you know if this is available via the Object Model?

Re: ESRI TOC Control

DominiqueBroux — Sat, 06 Aug 2011 10:33:46 GMT

I'd like to also bind Layer.Description or Description (see my xaml).
None of these work. I also notice that Description is never populated.
I see it in the arcgis/rest/services reference but this does not get populated..

Binding to 'Description' should work in all cases (i.e Description of the LayerItemViewModel)
Binding to 'Layer.Description' should work if the layer is implementing the 'Description' property (true with ArcGISDynamicMapServiceLayer/ArcGISTiledMapServiveLayer, but false with FeatureLayer).

Note: I was debugging the legend refresh event handler and perusing the e.LayerItem
to try and find Description with my value....
Do you know if this is available via the Object Model?

When you bind to 'Layer.Description', it means that you are using the layer properties which are depending on the type of layer. You can find the documentation here:
http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer.html
or http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISImageServiceLayer.html
or http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.FeatureLayer.html
...

On another hand, a binding to 'Description' means the 'Description' property of the LayerItemViewModel which is depending on the implementation of ILegendSupport for the type of layer.

For example for a feature layer Description is ~ to Layer.LayerInfo.Description.