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Hello,

I am trying to make a custom user control for the legend. I’d like to have a file, like MyLegend.xaml, along with a MyLegendViewModel.cs, which can be referenced in a larger view containing the associated surfaces, MyBigChartView.xaml / MyBigChartViewModel.cs. I can’t find any examples of this. Everything I’ve seen is about declaring an ItemTemplate or DataTemplate…

Can anyone point me towards a very simple example of using a custom xaml control to define the legend and then using that in another large xaml view?

Version
6.5
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Hi Kurt

This should be possible in SciChart WPF. Take a look at the LegendModifier documentation, we have a number of techniques on how to consume legend data.

Specifically this method looks closest to what you want to achieve:

Binding LegendModifier.LegendData to SciChartLegend

You can alternatively bind LegendModifier.LegendData to a
SciChartLegend and place anywhere in your application. You can also
bind to an LegendModifier.LegendData to an ItemsControl.ItemsSource
and template it as you wish.

<s:SciChartSurface x:Name="sciChart" s:ThemeManager.Theme="Chrome">

    <!-- XAxis, YAxis, Omitted for brevity -->

    <!--  Declare ChartModifiers  -->
    <s:SciChartSurface.ChartModifier>
        <s:ModifierGroup>
            <s:LegendModifier x:Name="legendModifier" GetLegendDataFor="AllSeries" ShowLegend="False"/>
        </s:ModifierGroup>
    </s:SciChartSurface.ChartModifier>

</s:SciChartSurface>

<!-- Somewhere else in your application, you can declare a SciChartLegend and bind to LegendModifier.LegendData -->
<s:SciChartLegend x:Name="legendControl"
   s:ThemeManager.Theme="Chrome"
   Margin="23,23"
   ScrollViewer.HorizontalScrollBarVisibility="Auto"
   ScrollViewer.VerticalScrollBarVisibility="Auto"
   LegendData="{Binding LegendData, ElementName=legendModifier, Mode=OneWay}"
   ShowVisibilityCheckboxes="True" />

the SciChartLegend is just a templated ItemsControl. You don’t need to use it. legendModifier.LegendData is an ObservableCollection of SeriesInfo. We discuss more about the SeriesInfo type here: SeriesInfo – the ViewModels for Tooltips and Legends.

In terms of actual examples? No-one has ever asked this exact requirement before so we don’t have an example.

There’s a couple of nice examples though in our Github repo showing some legend customisations. Check out this one on a custom legend row with color picker and more and this one which adds a Checkbox to show/hide the axis for each series in legend. These both use DataTemplate for legend items which is why I recommend the above technique on creating a custom control and binding to legendModifier.LegendData.

Hope this helps

Best regards,
Andrew

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