ToolTip.Opened 事件

定义

命名空间:

System.Windows.Controls

程序集:

PresentationFramework.dll

在 ToolTip 变得可见时发生。

public:
 event System::Windows::RoutedEventHandler ^ Opened;

public event System.Windows.RoutedEventHandler Opened;

member this.Opened : System.Windows.RoutedEventHandler 

Public Custom Event Opened As RoutedEventHandler 

事件类型

RoutedEventHandler

示例

以下示例演示如何为 Opened 和 Closed 事件设置事件处理程序。

tooltip.Opened +=
  new RoutedEventHandler(whenToolTipOpens);
tooltip.Closed +=
  new RoutedEventHandler(whenToolTipCloses);

AddHandler tooltip.Opened, AddressOf whenToolTipOpens
AddHandler tooltip.Closed, AddressOf 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;
    }
}

Private Sub whenToolTipOpens(ByVal sender As Object, ByVal e As RoutedEventArgs)
    Dim ell As New Ellipse()
    If sender.GetType().FullName.Equals("System.Windows.Shapes.Ellipse") Then
        ell = CType(sender, Ellipse)
        ell.Fill = Brushes.Blue
    ElseIf sender.GetType().FullName.Equals("System.Windows.Controls.ToolTip") Then
        Dim t As ToolTip = CType(sender, ToolTip)
        Dim p As Popup = CType(t.Parent, Popup)
        ell = CType(p.PlacementTarget, Ellipse)
        ell.Fill = Brushes.Blue
    End If
End Sub

Private Sub whenToolTipCloses(ByVal sender As Object, ByVal e As RoutedEventArgs)
    Dim ell As New Ellipse()
    If sender.GetType().FullName.Equals("System.Windows.Shapes.Ellipse") Then
        ell = CType(sender, Ellipse)
        ell.Fill = Brushes.Gray
    ElseIf sender.GetType().FullName.Equals("System.Windows.Controls.ToolTip") Then
        Dim t As ToolTip = CType(sender, ToolTip)
        Dim p As Popup = CType(t.Parent, Popup)
        ell = CType(p.PlacementTarget, Ellipse)
        ell.Fill = Brushes.Gray
    End If
End Sub

注解

当 FrameworkElement.ToolTipOpening 控件打开时 ToolTip ，也会引发 该事件。

路由事件信息

标识符字段	OpenedEvent
路由策略	鼓 泡
委托	RoutedEventHandler

另请参阅

• Closed
• ToolTipOpening