Manually turn on tooltip in TKChart in UI for Xamarin

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Manually turn on tooltip in TKChart

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Chart

This is a migrated thread and some comments may be shown as answers.

Bryce asked on 01 Mar 2018, 04:00 PM

Hi, I have a chart inside a Scrollview that wasn't scrolling. Based on this thread https://www.telerik.com/forums/tkchart-in-a-uiscrollview-can't-scroll I decided to look into a gesturerecognizer. However, the example shows how to select a point. What I would like is to turn on a tooltip. I have the behavior turned on but can't seem to manually turn on the tooltip itself. The tooltip works fine if I allow the LongPressGesture to resolve normally so that is not the issue. I just need to manually turn it on it seems.

This code seems to select the point, assuming I set the selection mode properly.

private void HandleTap(UITapGestureRecognizer tap)

{

var touchPoint = tap.LocationInView(Control.PlotView); // Control is TKChart

var hitTestInfo = Control.HitTestForPoint(touchPoint);

Control.Select(hitTestInfo);

}

How can I turn on the tooltip for that point as if they'd tapped it?

Thank you,

Bryce

1 Answer, 1 is accepted

answered on 05 Mar 2018, 09:19 AM

Hi Bryce,

Thank you for contacting us! In order to manually show the tool tip you would require the following:

- setup the trackball behavior to RadCartesianChart. Ii will simplify the tooltip content setup:

<telerikChart:RadCartesianChart.Behaviors>

<telerikChart:ChartTrackBallBehavior ShowTrackInfo="true" ShowIntersectionPoints="true"

/>

</telerikChart:RadCartesianChart.Behaviors>

- add the following code in the tap recognizer:

public void OnTap(UITapGestureRecognizer recognizer)

{

var touchPoint = recognizer.LocationInView(Control.PlotView); // Control is TKChart

this.Control.Trackball.ShowAtPoint(touchPoint);

}

Let me know if this helps.

Regards,
Tsvyatko
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