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1230
xamDataChart Legend Marker visibility
posted

Good day, 

I have a xamChart which is populated with series programmatically.  The user has the option to turn on markers containing data values, which is done through a DataTemplate as follows:




 
  Background="WhiteSmoke" 
 BorderBrush="{Binding Series.ActualMarkerOutline}"
 BorderThickness="1">
  Text="{Binding Item.AxisYValueFormatted}" 
 Foreground="Black" 
 FontSize="12" 
 HorizontalAlignment="Center" />

And assigned in C# using:



chartSeries.SetValue(Infragistics.Controls.Charts.MarkerSeries.MarkerTemplateProperty, this.FindResource("markerValueDataTemplate"));

I need to hide the empty marker balloons in the Legend representation of each series, as the visuals don't work very well.  Is this possible?

Thanks in advance,

Reinhardt

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  • 1230
    Verified Answer
    Offline posted

    Apologies for replying to my own post :)

    The solution is to add a visibility converter to the DataTemplate which binds to the [Item] object.  The [Item] object is null when the DataTemplate is rendered for the legend.

    The Converter:

    

    public class EmptyValueToVisibilityConverter : IValueConverter
     {
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
     {
     if ((value == DBNull.Value || value == null) == false &&
     value.ToString().Trim().Length > 0)
     return Visibility.Visible;
     else
     return Visibility.Collapsed;
     }
    

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
     {
     return null;
     }
     }

    And the modified DataTemplate:

    

    <DataTemplate x:Key="markerValueDataTemplate" x:Name="MarkerValueDataTemplate">
     <Grid Height="20" Margin="0, -25, 0, 0" Visibility="{Binding Item, Converter={StaticResource emptyValueToVisibility}}">
     
     <Border CornerRadius="5" 
     Background="WhiteSmoke" 
     BorderBrush="{Binding Series.ActualMarkerOutline}"
     BorderThickness="1">
     <TextBlock Margin="2" 
     Text="{Binding Item.AxisYValueFormatted}" 
     Foreground="Black" 
     FontSize="12" 
     HorizontalAlignment="Center" />
     </Border>
     </Grid>
     </DataTemplate>

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