SankeyDiagramControl.ToolTipController Property

Specifies the tooltip controller component that specifies the appearance, position, and other tooltip settings.

Namespace: DevExpress.XtraCharts.Sankey

Assembly: DevExpress.XtraCharts.v20.2.UI.dll

NuGet Package: DevExpress.Win.Charts

Declaration

C#

public ToolTipController ToolTipController { get; set; }

VB.NET

Public Property ToolTipController As ToolTipController

Property Value

Type	Description
ToolTipController	A tooltip controller.

Remarks

Tooltips are shown when you hover the mouse pointer over a node or link. Use the SankeyToolTipOptions.NodeToolTipEnabled, SankeyToolTipOptions.LinkToolTipEnabled and ToolTipController properties to disable/enable tooltips and customize their appearance.

Example

The following example formats text used in tooltips.

To format tooltip text, handle the CustomizeNodeToolTip and CustomizeLinkToolTip events and specify the CustomizeSankeyToolTipEventArgs.Title and CustomizeSankeyToolTipEventArgs.Content properties in event handlers.

The e.Node.Tag, e.Link.Source.Tag, and e.Link.Target.Tag properties store values that are shown in default tooltip titles. To obtain node and link weights, use the e.Node.TotalWeight and e.Link.TotalWeight properties.

C#

private void Form1_Load(object sender, EventArgs e) {
    sankeyDiagramControl1.ToolTipOptions.LinkToolTipEnabled = DevExpress.Utils.DefaultBoolean.True;
    sankeyDiagramControl1.ToolTipOptions.NodeToolTipEnabled = DevExpress.Utils.DefaultBoolean.True;
    sankeyDiagramControl1.ToolTipController = new DevExpress.Utils.ToolTipController { 
        ToolTipType = DevExpress.Utils.ToolTipType.Flyout, 
        AllowHtmlText = true 
    };
    sankeyDiagramControl1.CustomizeNodeToolTip += OnCustomizeNodeToolTip;
    sankeyDiagramControl1.CustomizeLinkToolTip += OnCustomizeLinkToolTip;
}
private void OnCustomizeNodeToolTip(object sender, CustomizeSankeyNodeToolTipEventArgs e) {
    e.Title = $"Country: <u>{e.Node.Tag}</u>";
    e.Content = $"{e.Node.TotalWeight:f1}";
}

private void OnCustomizeLinkToolTip(object sender, CustomizeSankeyLinkToolTipEventArgs e) {
    e.Title = $"{e.Link.Source.Tag} → {e.Link.Target.Tag}";
    e.Content = $"{e.Link.TotalWeight}";
}

VB.NET

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    sankeyDiagramControl1.ToolTipOptions.LinkToolTipEnabled = DevExpress.Utils.DefaultBoolean.[True]
    sankeyDiagramControl1.ToolTipOptions.NodeToolTipEnabled = DevExpress.Utils.DefaultBoolean.[True]
    sankeyDiagramControl1.ToolTipController = New DevExpress.Utils.ToolTipController With {
        .ToolTipType = DevExpress.Utils.ToolTipType.Flyout,
        .AllowHtmlText = True
    }
    sankeyDiagramControl1.CustomizeNodeToolTip += AddressOf OnCustomizeNodeToolTip
    sankeyDiagramControl1.CustomizeLinkToolTip += AddressOf OnCustomizeLinkToolTip
End Sub

Private Sub OnCustomizeNodeToolTip(ByVal sender As Object, ByVal e As CustomizeSankeyNodeToolTipEventArgs)
    e.Title = $"Country: <u>{e.Node.Tag}</u>"
    e.Text = $"{e.Node.TotalWeight:f1}"
End Sub

Private Sub OnCustomizeLinkToolTip(ByVal sender As Object, ByVal e As CustomizeSankeyLinkToolTipEventArgs)
    e.Title = $"{e.Link.Source.Tag} → {e.Link.Target.Tag}"
    e.Text = $"{e.Link.TotalWeight}";
End Sub