Force update trackball

[Marcus johansson]

Hello,

Is it possible to force update the trackball of a chart?

When the series have sparse values on the x-axis and you use the legend to hide a series, the trackball will still show the value of the hidden series when the mouse pointer re-enters the chart (atleast if it enters near the x value where it was when it left the chart).

Best regards,

Marcus

[Yuvaraj Palanisamy]

Hi Marcus, 

  

Greetings from Syncfusion support. 

  

We would like to let you know that we can refresh the trackball labels by force hiding it on Legend tapping. Please check the code snippet below.  

  

Xaml: 

<syncfusion:SfChart.Legend> 

        <syncfusion:ChartLegend MouseDown="legend1_MouseDown" ToggleSeriesVisibility="True"/> 

</syncfusion:SfChart.Legend> 

  

<syncfusion:SfChart.Behaviors> 

    <local:CustomTrackballBehavior x:Name="trackballBehavior"/> 

</syncfusion:SfChart.Behaviors> 

  

C#: 

private void legend1_MouseDown(object sender, MouseButtonEventArgs e) 

{ 

    trackballBehavior.Hide(); 

} 

. . . 

. . . 

public class CustomTrackballBehavior : ChartTrackBallBehavior 

{ 

    public void Hide() 

    { 

        IsActivated = false; 

        ClearItems(); 

        SetNativeInternalProperty(typeof(ChartTrackBallBehavior), this, string.Empty, "previousXLabel"); 

        SetNativeInternalProperty(typeof(ChartTrackBallBehavior), this, string.Empty, "previousYLabel"); 

    } 

  

    internal static void SetNativeInternalProperty(Type type, object obj, object value, string propertyName) 

    { 

        var properties = type.GetRuntimeProperties(); 

        foreach (var item in properties) 

        { 

            if (item.Name == propertyName) 

            { 

                item.SetValue(obj, value); 

                break; 

            } 

        } 

    } 

} 

  

Regards, 

Yuvaraj. 

[Marcus johansson]

Hello,

Thanks a lot for the quick answer, it worked perfectly!

Best regards,

Marcus

[Yuvaraj Palanisamy]

Hi Marcus, 

 

Thanks for your update. 

 

Regards, 

Yuvaraj.