I’m having some difficulty with the RolloverData PropertyChanged notification. I have attached an event handler based on your code, which is triggered as I mouse over the chart, but the SeriesInfo collection always has a count of 0. The data bound rollover block does update correctly.
Any ideas?
- Alex Lynch asked 12 years ago
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Hello Alex,
You’re right – I just looked at the RolloverModifier code and it assigns a new (empty) ObservableCollection before filling it with values.
May I ask, why do you need a notification of rollover? There may be another way to achieve what you want.
It’s a bit messy but the following code should get you a notifcation of new Rollover data
this.rolloverModifier.RolloverData.PropertyChanged += (s, e) => { // Rollover data was changed if (e.PropertyName == "SeriesInfo") { this.rolloverModifier.RolloverData.CollectionChanged += (c, args) => { // SerisInfo was added to the collection // NOTE: Be careful to unsubscribe to events as this handler will keep the // ObservableCollection alive on GC } } };
Another way might be to handle the MouseMove events and RenderedEvent on SciChartSurface itself and testing for new RolloverData here. For instance:
this.sciChartSurface.MouseMove += (s, e) => OnMouseMoveOrRendered(); this.sciChartSurface.Rendered += (s, e) => OnMouseMoveOrRendered(); private void OnMouseMoveOrRendered() { // Test for rollover data here, which is updated on mouse move // and on render of new data if (this.rolloverModifier.RolloverData.SeriesInfo != null) { // ... } }
- Andrew Burnett-Thompson answered 12 years ago
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