Tag: SelectionChanged

Questions

1 vote

3k views

I am trying to listen changes in pie chart segment selections. I am adding the listener like so:

piesegment.addChangeListener { changedSegment in
    print("changed selection \(changedSegment.isSelected)")
 }

The closure is never called however. My first question is: Is this the right way of doing this? In Android I implement the PieSegmentChangeListener interface and do an addIsSelectedChangeListener on the segment. In ios the SCIPieSegmentChangeListener is not a protocol. My second question is: How can I create a my own listener like in android and add it to the segment?

By the way support should not be exired!!!!

Marcus Maringer asked 10 months ago
last active 10 months ago

1 vote

2 answers

9k views

MVVM Binding RenderableSeries SelectionChanged event to handler with Interaction Trigger

WPF MVVM Interaction.Trigger SelectionChanged

Hello,

My goal is to have the user select a series with a mouse click, and to see which series was selected while following the MVVM pattern. I am filling in the DataSeries using a LineSeriesSource attached behaviour.

What I tried so far is to attach to the SelectionChanged event of a Renderable series with an Interaction Trigger.

This doesn’t work:

        <SciChart:SciChartSurface.ChartModifier>

            <SciChart:ModifierGroup>

                <SciChart:SeriesSelectionModifier >
                    <i:Interaction.Triggers>
                        <i:EventTrigger EventName="SelectionChanged" >
                            <i:InvokeCommandAction Command="{Binding Path=cmdSelectedSeriesChanged}" CommandParameter="{Binding Path=SelectedSeries}"/>
                        </i:EventTrigger>
                    </i:Interaction.Triggers>
                    <SciChart:SeriesSelectionModifier.SelectedSeriesStyle>
                        <Style TargetType="SciChart:BaseRenderableSeries">
                            <Setter Property="Stroke" Value="White"/>
                            <Setter Property="StrokeThickness" Value="2"/>
                        </Style>
                    </SciChart:SeriesSelectionModifier.SelectedSeriesStyle>
                </SciChart:SeriesSelectionModifier>

        </SciChart:ModifierGroup>
        </SciChart:SciChartSurface.ChartModifier>

This works, but is not what I want since it’s not MVVM:

<SciChart:SciChartSurface.ChartModifier>

                <SciChart:ModifierGroup>

                    <SciChart:SeriesSelectionModifier SelectionChanged="SeriesSelectionModifier_SelectionChanged">

                        <SciChart:SeriesSelectionModifier.SelectedSeriesStyle>
                            <Style TargetType="SciChart:BaseRenderableSeries">
                                <Setter Property="Stroke" Value="White"/>
                                <Setter Property="StrokeThickness" Value="2"/>
                            </Style>
                        </SciChart:SeriesSelectionModifier.SelectedSeriesStyle>
                    </SciChart:SeriesSelectionModifier>

            </SciChart:ModifierGroup>
            </SciChart:SciChartSurface.ChartModifier>

Interaction Propety cannot be attached to SciChartSurface.RenderableSeries.
I also tried attaching the Interaction Property to an individual DataSeries, which is definitely not what I want to do, but it doesn’t work either.

/Tomasz