Esta documentación está archivada y no tiene mantenimiento.

FrameworkElement.ToolTipOpening (Evento)

Occurs when any tooltip on the element is opened.

Espacio de nombres: System.Windows
Ensamblado: PresentationFramework (en presentationframework.dll)
Espacio de nombres XML:

public event ToolTipEventHandler ToolTipOpening
/** @event */
public void add_ToolTipOpening (ToolTipEventHandler value)

/** @event */
public void remove_ToolTipOpening (ToolTipEventHandler value)

En JScript, se pueden controlar los eventos que define una clase, pero no se pueden definir unos propios.
<object ToolTipOpening="ToolTipEventHandler" .../>

Identifier field


Routing strategy




  • Override OnToolTipClosing to implement class handling for this event in derived classes.

To prevent a tooltip from appearing in the UI, your handler for ToolTipOpening can mark the ToolTipEventArgs event data handled. Otherwise, the tooltip is displayed, using the value of the ToolTip property as the tooltip content. Another possible scenario is that you could write a handler that resets the value of the ToolTip property for the element that is the event source, just before the tooltip is displayed.

ToolTipOpening will not be raised if the value of ToolTip is referencia null (Nothing en Visual Basic) or otherwise unset. Do not deliberately set ToolTip to referencia null (Nothing en Visual Basic) while a tooltip is open or opening; this will not have the effect of closing the tooltip, and will instead create an undesirable visual artifact in the UI.

The ToolTipOpening event cannot be an EventTrigger in a style. This is because the identifier field of this event re-uses an implementation from a service that does not expose add/remove event methods for the service-level event.

Microsoft .NET Framework 3.0 es compatible con Windows Vista, Microsoft Windows XP SP2 y Windows Server 2003 SP1.

.NET Framework

Compatible con: 3.0