corelibraries-devexpress-dot-xtracharts-dot-heatmap-7946734f.md
Provides data for the CustomizeHeatmapToolTip event.
Namespace : DevExpress.XtraCharts.Heatmap
Assembly : DevExpress.XtraCharts.v25.2.dll
NuGet Package : DevExpress.Charts
public class CustomizeHeatmapToolTipEventArgs :
EventArgs
Public Class CustomizeHeatmapToolTipEventArgs
Inherits EventArgs
CustomizeHeatmapToolTipEventArgs is the data class for the following events:
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:
true.The code below applies a custom format to tooltip text if a heatmap cell value is more than the specified value:
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>";
}
}
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
Object EventArgs CustomizeHeatmapToolTipEventArgs
See Also