HeatmapControl.QueryChartCursor Event

Occurs when there is a request to display the cursor on the heatmap chart.

Namespace : DevExpress.Xpf.Charts.Heatmap

Assembly : DevExpress.Xpf.Charts.v25.2.dll

NuGet Package : DevExpress.Wpf.Charts

Declaration

C#
VB.NET

csharp

public event QueryChartCursorEventHandler QueryChartCursor

Public Event QueryChartCursor As QueryChartCursorEventHandler

Event Data

The QueryChartCursor event's data class is QueryChartCursorEventArgs. The following properties provide information specific to this event:

Property	Description
Cursor	Gets or sets the mouse cursor currently being shown for the chart.
CursorImage	Provides an image for the custom cursor.
CursorImageOffset	Specifies an image offset for a custom cursor on a chart diagram.
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
Position	Gets or sets a value that specifies the position of a custom cursor on the chart’s diagram.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

In the QueryChartCursor event handler, you can provide custom cursors for the heatmap in various circumstances (for example, when the heatmap is scrolled or zoomed).

XAML

xaml

<dxh:HeatmapControl QueryChartCursor="heatmapControl_QueryChartCursor">
<!--...-->
</dxh:HeatmapControl>

C#
VB.NET

csharp

using System;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media.Imaging;
//...
    private void heatmapControl_QueryChartCursor(object sender, QueryChartCursorEventArgs e) {
        e.Cursor = Cursors.None;
        e.CursorImage = new BitmapImage(new Uri(@"D:\CustomCursor\cursor.png", UriKind.RelativeOrAbsolute));
    }

Imports System.Windows.Media.Imaging
'...
    Private Sub heatmapControl_QueryChartCursor(ByVal sender As Object, ByVal e As QueryChartCursorEventArgs)
        e.Cursor = Cursors.None
        e.CursorImage = New BitmapImage(New Uri("D:\CustomCursor\cursor.png", UriKind.RelativeOrAbsolute))
    End Sub