Are you having a problem just when you scroll?
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OK, you want to track the view property event with hints for DocPosition and DocScale…
I think Jake means the GoView.PropertyChanged event.
Could you please post me some sample ?
if (e.PropertyName == "DocPosition" || e.PropertyName == "DocScale")
// .... update ruler ....
You add this to your view class. It gets called when the DocPosition changes (e.g. on a scroll) and also when the DocScale changes.