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ToolTipService.ToolTipOpeningEvent Field

Identifies the ToolTipOpening event that is exposed by objects that use the ToolTipService service to display tooltips.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public static readonly RoutedEvent ToolTipOpeningEvent

Field Value

Type: System.Windows.RoutedEvent
The identifier for the ToolTipOpening event.

The ToolTipOpening event occurs immediately before a tooltip opens. This event does not occur if the tooltip is not defined or if the tooltip content is set to null.

This field registers the behavior of the ToolTipOpening event for classes that use this service. The FrameworkElement and FrameworkContentElement classes both implement the ToolTipService and expose this event through the common language runtime (CLR) accessors FrameworkElement.ToolTipOpening and FrameworkContentElement.ToolTipOpening.

If you specify the tooltip as a ToolTip object, the Opened event is also raised when the tooltip opens.

The following example shows how to set an event handler for the FrameworkElement.ToolTipOpening event. In this case, the event handler is actually for FrameworkElement.ToolTipOpening, because the Ellipse where the handler is attached is a derived class of FrameworkElement.

ellipse2.AddHandler(ToolTipService.ToolTipOpeningEvent,
    new RoutedEventHandler(whenToolTipOpens));
ellipse2.AddHandler(ToolTipService.ToolTipClosingEvent,
    new RoutedEventHandler(whenToolTipCloses));

        void whenToolTipOpens(object sender, RoutedEventArgs e)
        {
            Ellipse ell = new Ellipse();
            if (sender.GetType().FullName.Equals("System.Windows.Shapes.Ellipse"))
            {
                ell = (Ellipse)sender;
                ell.Fill = Brushes.Blue;
            }
            else if (sender.GetType().FullName.Equals(
                                     "System.Windows.Controls.ToolTip"))
            {
                ToolTip t = (ToolTip)sender;
                Popup p = (Popup)t.Parent;
                ell = (Ellipse)p.PlacementTarget;
                ell.Fill = Brushes.Blue;
            }
        }

        void whenToolTipCloses(object sender, RoutedEventArgs e)
        {
            Ellipse ell = new Ellipse();
            if (sender.GetType().FullName.Equals(
                              "System.Windows.Shapes.Ellipse"))
            {
                ell = (Ellipse)sender;
                ell.Fill = Brushes.Gray;
            }
            else if (sender.GetType().FullName.Equals(
                                   "System.Windows.Controls.ToolTip"))
            {
                ToolTip t = (ToolTip)sender;
                Popup p = (Popup)t.Parent;
                ell = (Ellipse)p.PlacementTarget;
                ell.Fill = Brushes.Gray;
            }
        }

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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