IRenderableSeriesViewModel IncludeLegend property is missing

Hi Andrew,

thank you for your support! That would also be a possible solution. However, I now had to override the LegendModifier.GetSeriesInfo. When the “IncludeLegend” property is added in a new SciChart release, we will refactor our code.

regards
Tobias

Hi Tobias

Good point, it is an attached property so strictly speaking not part of RenderableSeries.

You can set this via MVVM Series styles. See this guide:

Worked Example: Style Series in MVVM

Series can be styled in MVVM by registering a style in XAML and
referencing it from the ViewModel.

To do this, you need to declare a Style
(TargetType=FastLineRenderableSeries, or, your chosen series type) in
XAML and give it a key. Next, set the
LineRenderableSeriesViewModel.StyleKey property equal to the key in
XAML. SciChart picks it up and applies the style automagically to the
series!

See the documentation page for code sample. I suggest creating a series style when you want to include/exclude a series explicitly from the legend.

If you want to update this property dynamically however, you will need to bind in the style to something. Perhaps a global registry somewhere with names of series + whether included in the legend or not?

Best regards
Andrew

Hi Andrew,

thank you for your answer. The disadvantage is that a separate style has to be created for each series type. A property in the IRenderableSeriesViewModel would be a quick and generic solution for the chart library (MVVM) user.

regards
Tobias

Hi Tobias

Of course, but adding a property then the delay of our release & test cycles means you won’t get a solution immediately.

How about this?

BaseRenderableSeriesViewModel has a Tag property which can be any object.

What about a style which binds to a custom object that you put on there with extra properties?

In view:

<Style x:Key="SeriesStyleKey" TargetType="{x:Type s:BaseRenderableSeries}">
    <Setter Property="s:LegendModifier.IncludeSeries" Value="{Binding Tag.IsIncludedInLegend}"/>
</Style>

<s:SciChartSurface RenderableSeries="{s:SeriesBinding SeriesViewModels}">
</s:SciChartSurface>

In ViewModel

public class ExtraPropsViewModel 
{ 
     public bool IsIncludedInLegend { get; set; }
}

public class MyViewModel 
{
    public ObservableCollection<BaseRenderableSeriesViewModel> SeriesViewModels { get; set; }

    void Foo() 
    { 
          SeriesViewModels.Add(new FastLineRenderableSeriesViewModel() 
          {
              Tag = new ExtraPropsViewModel() { IsIncludedInLegend = true }
              StyleKey = "SeriesStyleKey"
          });
    }
}

I’ve shortened that for brevity but shows the principle of the idea

Best regards
Andrew