Advanced RolloverModifier: binding to XValues, Formatting Text

Hi Andy,

The RolloverModifier samples demonstrate that the RolloverModifier is simply a data-source, which gives you an ObservableCollection<SeriesInfo> to bind to.

There is a long explanation in the answer RolloverLabelTemplate show X and Y Value Separated which shows how to get the X Value in the Rollover legend output, and how to apply a custom string format to the X or Y Value.

Hope this helps,
Andrew

Hi Andrew,

Already seen the examples, browsed through the definitions, not managed to make it work, hence here! I saw the XValue, but my output-x-value solution is all rather hacky. Not to worry – it works at least.

And in case anyone else needs to know, after much hacking around I came up with this to display something if there is no data…

            <ItemsControl.Style>
                <Style TargetType="{x:Type ItemsControl}">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding Path=RolloverData.SeriesInfo,Converter={StaticResource EmptyCollectionConverter}}" Value="True">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate TargetType="{x:Type ItemsControl}">
                                        <TextBlock Text="No data selected" Margin="5,0" HorizontalAlignment="Center" />
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </ItemsControl.Style>



public class EmptyCollectionConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var collection = value as ICollection;

        if (collection == null)
        {
            return null;
        }

        return collection.Count == 0;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Hope it helps someone!