CustomizeHeatmapToolTipEventArgs.Text Property

Gets or sets the cell tooltip text.

Namespace : DevExpress.XtraCharts.Heatmap

Assembly : DevExpress.XtraCharts.v25.2.dll

Declaration

C#
VB.NET

csharp

public string Text { get; set; }

Public Property Text As String

Property Value

Type	Description
String

A string value that specifies the tooltip text.

Remarks

To use HTML tags to format Text, initialize the HeatmapControl.ToolTipController property with a ToolTipController object, and enable the controller’s ToolTipController.AllowHtmlText property.

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#
VB.NET

csharp

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