How to move chart scroll by arrow key

Hello and thanks for your enquiry!

We had a similar request a while back asking for key bindings to move the RolloverModifier line one step to the left or right. Please take a look here.

If you were to create a similar CustomModifier except you updated the XAxis.VisibleRange you could achieve scrolling, for instance:

public class ScrollWithArrowKeysModifier : ChartModifierBase
{
    void KeydownRolloverModifier_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        int pointsToScroll;
        if (e.Key == Key.Right)
        {
            pointsToScroll = 1;
        }
        if (e.Key == Key.Left)
        {
            pointsToScroll = -1;
        }
 
        // This code assumes you are using a CategoryDateTimeAxis. If not then you will need to adjust it
        var inputRange = ParentSurface.XAxis.VisibleRange as IndexRange;
        var outputRange = new IndexRange(inputRange.Min + pointsToScroll, inputRange.Max + pointsToScroll);
        ParentSurface.XAxis.VisibleRange = outputRange;
    }
 
    public override void OnAttached()
    {
        base.OnAttached();
        var scichart = (ParentSurface as SciChartSurface);
        scichart.FindLogicalParent<Window>().PreviewKeyDown +=
            new KeyEventHandler(KeydownRolloverModifier_PreviewKeyDown);
    }

    public override void OnDetached()
    {
        // Todo: You might want to unsubscribe to PreviewKeyDown here
    }
}

The above should work – let me know if it helps!

Also note in SciChart 2 we have introduced an additional API, which allows you to get a helper class off an axis to perform VisibleRange manipulations.

Try this code out:

IAxisInteractivityHelper axisHelper = ParentSurface.XAxis.GetCurrentInteractivityHelper();
IRange outputRange = axisHelper.ScrollBy(inputRange, pointsToScroll);
ParentSurface.XAxis.VisibleRange = outputRange;

I hope this helps!

Andrew