How to: Implement Custom Hot-Tracking and Selection

• Nov 13, 2018
• 2 minutes to read

This example demonstrates how to implement custom hot-tracking and selection of the chart’s elements at runtime.

Note

To enable runtime selection, the ChartControl.SelectionMode property should be set to Single, Multiple or Extended.

If you want to change the default hot-tracking and selection, you should handle the ChartControl.ObjectHotTracked and ChartControl.ObjectSelected events, implement your custom hot-tracking and selection approaches and set the Cancel property to true.

For example, the code below disables selection and hot-tracking of a chart’s diagram.

C#

using DevExpress.XtraCharts;
// ...

private void chartControl1_ObjectHotTracked(object sender, HotTrackEventArgs e) {
   // Prevent the chart's diagram from being hot-tracked.
   if (e.Object is Diagram) 
      e.Cancel = true;
}

private void chartControl1_ObjectSelected(object sender, HotTrackEventArgs e) {
   // Prevent the chart's Diagram from being selected.
   if (e.Object is Diagram) 
      e.Cancel = true;
}

VB.NET

Imports DevExpress.XtraCharts
' ...

Private Sub OnObjectHotTracked(sender As Object, e As HotTrackEventArgs) _
Handles ChartControl1.ObjectHotTracked
   ' Prevent the chart's Diagram from being hot-tracked.
   If TypeOf e.Object Is Diagram Then
      e.Cancel = True
   End If
End Sub

Private Sub OnObjectSelected(sender As Object, e As HotTrackEventArgs) _
Handles ChartControl1.ObjectSelected
   ' Prevent the chart's Diagram from being selected.
   If TypeOf e.Object Is Diagram Then
      e.Cancel = True
   End If
End Sub