XtraCharts > 示例 > 如何：实现自定义热跟踪和选择

这个示例展示了在运行时刻如何实现图表元素的自定义热跟踪和选择。

注意
要启用运行时刻热跟踪和选择，则应该把 ChartControl.RuntimeSelection 属性设置为 true。

如果需要改变默认的热跟踪和选择，那么就接管 ChartControl.ObjectHotTracked 和 ChartControl.ObjectSelected 事件，实现自定义热跟踪和选择方法，并把 Cancel 属性设置为 true。

例如，下面的代码举例说明了如何禁用图表图象的热跟踪和选择。

C#	复制代码
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; }

复制代码

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;
}

Visual Basic	复制代码
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

Visual Basic

复制代码

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

参阅