ChartControl.ObjectSelected Event

Occurs before any chart element is selected at runtime.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v21.1.UI.dll

Declaration

public event HotTrackEventHandler ObjectSelected

Event Data

The ObjectSelected event's data class is HotTrackEventArgs. The following properties provide information specific to this event:

Property Description
AdditionalObject Provides access to an object related to the object being hit. The returned value depends on the HotTrackEventArgs.Object type and hit point location.
Cancel Gets or sets whether the hot-tracking should be cancelled.
HitInfo Gets details on the chart elements located at the point where an end-user has clicked when hot-tracking or selecting a chart element at runtime.
Object Gets the chart element, for which the event was raised.

Remarks

Users can select chart elements if the ChartControl.SelectionMode property is set to Single, Multiple or Extended. Handle the ObjectSelected event if you wish to perform specific actions when a user selects chart elements, or if you want to disable a selection of elements. You can use the the HotTrackEventArgs.Object property to access the selected element.

NOTE

If you handle the ObjectSelected event, it is raised regardless of the current ChartControl.SelectionMode property value.

Example

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.

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;
}
See Also