Getting a custom modifier to render | Fast, Native Chart Controls for WPF, iOS, Android and Xamarin

Hi!

I am using a custom modifier written guided by the example in http://http://www.scichart.com/extending-scichart-with-text-annotations-and-screenshots/

However, I am running mvvm and have an Annotations dependency property in my modifier.

However, when the Annotations property in my viewmodel is changed, the modifier does not redraw itself. I have to do something else, like switch over to another tab and then back again for the new annotations to appear.

Any ideas to how I can get the modifier to draw the new annotations?

WPF

Lisbeth Skogland asked 5 years ago

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Answers (1)

Hello Lisbeth,

Is the Annotations DependencyPropertyChanged callback firing? If so then it sounds like your binding is wired up ok, you just need to trigger a redraw. In a Chart Modifier you can do this by calling

base.ParentSurface.InvalidateElement();

This will cause the chart to redraw itself (All series and annotations). Please let me know if this helps!

Andrew answered 5 years ago

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