Click/MouseDown event for a series in a graph.

Hello

We need to hook up to an event that is triggered each time you click on a series(in our case a line series). At the moment the graph component has a SelectedSeriesChangedEvent, but that is triggered when the selection is changed.

Is it possible to get such an event implemented or do you have any suggestions on how to hook up such an event?

We add our series dynamically through a class that syncs a collection of dataseries to the Graph.

Best regards Nicklas

Hello Nicklas

For now try the following:

chart.AddHandler(UIElement.MouseDownEvent, new MouseButtonEventHandler(Chart_MouseDown));

where chart is a Chart instance.

private void Chart_MouseDown(object sender, MouseButtonEventArgs args)
{
  System.Windows.Shapes.Path path = args.OriginalSource as System.Windows.Shapes.Path;
  if (path != null)
  {
    LineSeries series = path.DataContext as LineSeries;
    if (series != null)
    {

    }
  }
}

This event handler will be called whenever the mouse is pressed over the chart. If the OriginalSource of the event is a Path, and the DataContext of that path is a LineSeries (or similar), then you'll know the mouse has been pressed on the line of the series. If your lines are very thin, or if you find that you need to press the mouse very close to the line, then get the next nightly build which will make the above code equally as sensitive as the logic that selects the series.

For now I have made a note to add proper API for this in a future version.

Jason Fauchelle