RolloverMarkerHelper for MVVM series

Hi there,

So you can apply a style, control template or whatever you like to a RolloverModifier in SciChart WPF when using the MVVM API

Following our guide in Worked Example – Style a Series in MVVM

When you declare a style in XAML like this:

 <Style TargetType="s:FastLineRenderableSeries" x:Key="LineSeriesStyle0">
     <Setter Property="StrokeDashArray" Value="5 5"/>
     <Setter Property="StrokeThickness" Value="4"/>
     <Setter Property="Stroke" Value="Orange"/>
     <Setter Property="SelectedSeriesStyle">
        <Setter.Value>
           <Style TargetType="s:FastLineRenderableSeries">
              <Setter Property="StrokeDashArray" Value="5 5"/>
              <Setter Property="StrokeThickness" Value="3"/>
              <Setter Property="Stroke" Value="White"/>
           </Style>
        </Setter.Value>
     </Setter>
  </Style>

you can then apply that style in the viewmodel by setting the StyleKey property of LineRenderableSeriesViewModel, e.g.

public class HelloSciChartWorldViewModel : INotifyPropertyChanged
{
       private readonly ObservableCollection<IRenderableSeriesViewModel> _seriesViewModels = new ObservableCollection<IRenderableSeriesViewModel>();

       public event PropertyChangedEventHandler PropertyChanged;

       public HelloSciChartWorldViewModel()
       {
             var xyData = new XyDataSeries<double, double>();
             for (int i = 0; i < 100; i++)
             {
                    xyData.Append(i, Math.Sin(i * 0.2));
             }

             SeriesViewModels.Add(new LineRenderableSeriesViewModel()
             {
                    DataSeries = xyData,       
                    // Set the StyleKey equal to the x:Key in XAML
                    StyleKey = "LineSeriesStyle0"
             });
       }

       public ObservableCollection<IRenderableSeriesViewModel> SeriesViewModels
       {
             get { return _seriesViewModels; }
       }

       protected virtual void OnPropertyChanged(string propertyName)
       {
             var handler = PropertyChanged;
             if (handler != null)
             {
                    handler(this, new PropertyChangedEventArgs(propertyName));
             }           
       }
}

Using this technique you should be able to apply the control template to the FastLineRenderableSeries.RolloverMarkerTemplate property via its style in XAML

Let me know if this helps