kb-chartview-display-trackball-right-click.md

title	page_title	description	type	slug	position	tags	ticketid	res_type
Display Trackball Info on Right Mouse Click	Show RadCartesianChart Trackball when Right Mouse Button is Pressed	How to display the ChartView trackball on right mouse button click.	how-to	kb-chartview-display-trackball-right-click	0	mouse,click,press,trackball	1415833	kb

Environment

Product Version	2019.2 624
Product	RadChartView for WPF

Description

How to display the ChartView trackball on right mouse button click.

Solution

Subscribe to the PositionChanging event of the ChartTrackBallBehavior and reset the last position if the mouse right button wasn't not clicked. Then subscribe to the MouseRightButtonDown event of RadCartesianChart and set the Position property of the behavior manually.

[XAML]

{{region kb-chartview-display-trackball-right-click-0}} telerik:RadCartesianChart.Behaviors <telerik:ChartTrackBallBehavior PositionChanging="ChartTrackBallBehavior_PositionChanging" x:Name="trackballBehavior" /> </telerik:RadCartesianChart.Behaviors> {{endregion}}

[C#]

{{region kb-chartview-display-trackball-right-click-1}} public partial class MainWindow : Window { private bool isManualPositionChange = false;

    public MainWindow()
    {
        InitializeComponent();
        this.trackballBehavior.Position = new Point(100, 321);
    }

    private void ChartTrackBallBehavior_PositionChanging(object sender, Telerik.Windows.Controls.ChartView.TrackBallPositionChangingEventArgs e)
    {
        if (e.NewPosition != e.PreviousPosition && !isManualPositionChange)
        {
            e.NewPosition = e.PreviousPosition;
        }           
        this.isManualPositionChange = false;
    }

    private void RadCartesianChart_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
    {
        isManualPositionChange = true;
        this.trackballBehavior.Position = e.GetPosition(this.chart);
    }
}

{{endregion}}