CustomizeHeatmapToolTipEventArgs Class

Provides data for the CustomizeHeatmapToolTip event.

Namespace: DevExpress.XtraCharts.Heatmap

Assembly: DevExpress.XtraCharts.v25.1.dll

NuGet Package: DevExpress.Charts

Declaration

C#

public class CustomizeHeatmapToolTipEventArgs :
    EventArgs

VB.NET

Public Class CustomizeHeatmapToolTipEventArgs
    Inherits EventArgs

Related API Members

CustomizeHeatmapToolTipEventArgs is the data class for the following events:

• HeatmapControl.CustomizeHeatmapToolTip

Example

This example shows how to use the HeatmapControl.CustomizeHeatmapToolTip event to modify tooltip content based on the cell value for which the tooltip is shown.

Follow the steps below to enable and customize tooltips:

• Set the HeatmapControl.ToolTipEnabled property to true.
• Initialize the HeatmapControl.ToolTipController property with a ToolTipController object. Enable the controller’s AllowHtmlText property to apply HTML tags to tooltip content.
• In the HeatmapControl.CustomizeHeatmapToolTip event handler, specify the e.Title and e.Text properties to format tooltip text.

The code below applies a custom format to tooltip text if a heatmap cell value is more than the specified value:

C#

const int ThresholdValue = 50;

public Form1() {
    InitializeComponent();
    // ...
    heatmap.ToolTipEnabled = true;
    heatmap.ToolTipController = new DevExpress.Utils.ToolTipController { AllowHtmlText = true };
    heatmap.CustomizeHeatmapToolTip += OnHeatmapCustomizeHeatmapToolTip;
}

private void OnHeatmapCustomizeHeatmapToolTip(object sender, CustomizeHeatmapToolTipEventArgs e) {
    double cellValue = (double)e.HeatmapCell.ColorValue;
    if (cellValue > ThresholdValue) {
        e.Title = "Sale Info";
        e.Text = $"Total: <color=green>${cellValue}K</color>";
    }
}

VB.NET

Const ThresholdValue As Integer = 50

Public Sub New()
    heatmap.ToolTipEnabled = True
    heatmap.ToolTipController = New DevExpress.Utils.ToolTipController With {
        .AllowHtmlText = True
    }
    heatmap.CustomizeHeatmapToolTip += AddressOf OnHeatmapCustomizeHeatmapToolTip
End Sub

Private Sub OnHeatmapCustomizeHeatmapToolTip(ByVal sender As Object, ByVal e As CustomizeHeatmapToolTipEventArgs)
    Dim cellValue As Double = CDbl(e.HeatmapCell.ColorValue)

    If cellValue > ThresholdValue Then
        e.Title = "Sale Info"
        e.Text = $"Total: <color=green>${cellValue}K</color>"
    End If
End Sub

Inheritance

Object

EventArgs

CustomizeHeatmapToolTipEventArgs