topic Controlling content of a DataTemplate in ArcGIS API for Silverlight Questions

Controlling content of a DataTemplate

PaulHuppé — Mon, 14 Nov 2011 12:14:44 GMT

Hi,

Is there a way to control the content of a DataTemplate depending on the value of a map layer label? Below is part of my template. What I want to do is to display an hyperlink for all map layers, but not for the Graphic Layer. So, for all layers, I want to use the Hyperlink control and not show the CheckBox. And for the GraphicLayer, I want to show the CheckBox instead of the Hyperlink control. Is there an easy way to do this?

Thanks,
Paul

    <esri:Legend.MapLayerTemplate>
     <DataTemplate>
      <StackPanel Orientation="Horizontal">
                            <CheckBox Content="{Binding Label}"
         IsChecked="{Binding IsEnabled, Mode=TwoWay}"
         IsEnabled="{Binding IsInScaleRange}" >
                            </CheckBox>
                            <HyperlinkButton Content="{Binding Label}" TargetName="_new" NavigateUri="http://www.nrcan.gc.ca/">
                                <ToolTipService.ToolTip>
                                    <StackPanel MaxWidth="400">
                                        <TextBlock FontWeight="Bold" Text="Show Metadata - Opens in new window" TextWrapping="Wrap" />
                                    </StackPanel>
                                </ToolTipService.ToolTip>
                            </HyperlinkButton>

Re: Controlling content of a DataTemplate

dotMorten_esri — Mon, 14 Nov 2011 17:09:36 GMT

Create a custom value converter that flips visibility based on the type of the layer.
http://msdn.microsoft.com/en-us/library/system.windows.data.ivalueconverter(v=vs.95).aspx

Re: Controlling content of a DataTemplate

DominiqueBroux — Tue, 15 Nov 2011 05:39:22 GMT

There are more infos about what Morten suggests in this thread.

Re: Controlling content of a DataTemplate

PaulHuppé — Tue, 15 Nov 2011 11:15:21 GMT

Thanks both of you. I will start on building a converter. Always something new to learn!
Paul

Re: Controlling content of a DataTemplate

PaulHuppé — Sun, 12 Dec 2021 02:54:33 GMT

Question about the converter:

When I look at the samples, the converter is defined as:

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
   return value is GraphicsLayer ? Visibility.Visible : Visibility.Collapsed;
 }

Is it possible to have more than one parameter? Can I do something like:

public object Convert(object value, Type targetType, object parameter1, object parameter2, System.Globalization.CultureInfo culture)
{
   // do something using the parameters which would set a visibility variable
   return visibility //return the value of my variable
 }

and in my XAML, I would have something like:

                            <CheckBox Content="{Binding Label}"
    IsChecked="{Binding IsEnabled, Mode=TwoWay}"
    IsEnabled="{Binding IsInScaleRange}"
                                Visibility="{Binding Layer, Converter={StaticResource VisConverter}, ConverterParameter=Layer, ConverterParameter='a string here'} " >
                            </CheckBox>

Re: Controlling content of a DataTemplate

PaulHuppé — Tue, 15 Nov 2011 12:10:59 GMT

Found a way to do what I wanted with only one parameter. But I am still interested to know if we can have more than one parameter.

Re: Controlling content of a DataTemplate

JenniferNery — Tue, 15 Nov 2011 13:29:47 GMT

This seem related (Silverlight Forum: http://forums.silverlight.net/t/86106.aspx)

Re: Controlling content of a DataTemplate

DominiqueBroux — Wed, 16 Nov 2011 10:25:39 GMT

Note that in your sample you don't need the layer as first parameter since it's already the main value to convert ('object value' parameter).

So you can use the ConverterParameter for your string.

Re: Controlling content of a DataTemplate

PaulHuppé — Wed, 16 Nov 2011 10:31:45 GMT

Yes, that is true. My question was more in the case where I would need to do something more complicated where I would require more information to do would be needed.