FrameworkContentElement.ContextMenuClosing 事件

定义

命名空间:

System.Windows

程序集:

PresentationFramework.dll

在元素上的任何上下文菜单关闭之前发生。

public:
 event System::Windows::Controls::ContextMenuEventHandler ^ ContextMenuClosing;

public event System.Windows.Controls.ContextMenuEventHandler ContextMenuClosing;

member this.ContextMenuClosing : System.Windows.Controls.ContextMenuEventHandler 

Public Custom Event ContextMenuClosing As ContextMenuEventHandler 

事件类型

ContextMenuEventHandler

示例

以下示例实现一个处理程序，该处理程序更改命名区域 DisplayArea 上的光标 (不显示在) 。 注释暗示 UIElement 了用法，但事实上，如果 DisplayArea 为 FrameworkContentElement，此示例将相同。

private void CursorTypeChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBox source = e.Source as ComboBox;

    if (source != null)
    {
        ComboBoxItem selectedCursor = source.SelectedItem as ComboBoxItem;

        // Changing the cursor of the Border control 
        // by setting the Cursor property
        switch (selectedCursor.Content.ToString())
        {
            case "AppStarting":
                DisplayArea.Cursor = Cursors.AppStarting;
                break;
            case "ArrowCD":                        
                DisplayArea.Cursor = Cursors.ArrowCD;
                break;
            case "Arrow":
                DisplayArea.Cursor = Cursors.Arrow;
                break;
            case "Cross":
                DisplayArea.Cursor = Cursors.Cross;
                break;
            case "HandCursor":
                DisplayArea.Cursor = Cursors.Hand;
                break;
            case "Help":
                DisplayArea.Cursor = Cursors.Help;
                break;
            case "IBeam":
                DisplayArea.Cursor = Cursors.IBeam;
                break;
            case "No":
                DisplayArea.Cursor = Cursors.No;
                break;
            case "None":
                DisplayArea.Cursor = Cursors.None;
                break;
            case "Pen":
                DisplayArea.Cursor = Cursors.Pen;
                break;
            case "ScrollSE":
                DisplayArea.Cursor = Cursors.ScrollSE;
                break;
            case "ScrollWE":
                DisplayArea.Cursor = Cursors.ScrollWE;
                break;
            case "SizeAll":
                DisplayArea.Cursor = Cursors.SizeAll;
                break;
            case "SizeNESW":
                DisplayArea.Cursor = Cursors.SizeNESW;
                break;
            case "SizeNS":
                DisplayArea.Cursor = Cursors.SizeNS;
                break;
            case "SizeNWSE":
                DisplayArea.Cursor = Cursors.SizeNWSE;
                break;
            case "SizeWE":
                DisplayArea.Cursor = Cursors.SizeWE;
                break;
            case "UpArrow":
                DisplayArea.Cursor = Cursors.UpArrow;
                break;
            case "WaitCursor":
                DisplayArea.Cursor = Cursors.Wait;
                break;
            case "Custom":
                DisplayArea.Cursor = CustomCursor;
                break;
            default:
                break;
        }

        // If the cursor scope is set to the entire application
        // Use OverrideCursor to force the cursor for all elements
        if (!cursorScopeElementOnly)
        {
            Mouse.OverrideCursor = DisplayArea.Cursor;
        }
    }
}

' When the Radiobox changes, a new cursor type is set
Private Sub CursorTypeChanged(ByVal sender As Object, ByVal e As SelectionChangedEventArgs)

    Dim item As String = CType(e.Source, ComboBox).SelectedItem.Content.ToString()

    Select Case item
        Case "AppStarting"
            DisplayArea.Cursor = Cursors.AppStarting
        Case "ArrowCD"
            DisplayArea.Cursor = Cursors.ArrowCD
        Case "Arrow"
            DisplayArea.Cursor = Cursors.Arrow
        Case "Cross"
            DisplayArea.Cursor = Cursors.Cross
        Case "HandCursor"
            DisplayArea.Cursor = Cursors.Hand
        Case "Help"
            DisplayArea.Cursor = Cursors.Help
        Case "IBeam"
            DisplayArea.Cursor = Cursors.IBeam
        Case "No"
            DisplayArea.Cursor = Cursors.No
        Case "None"
            DisplayArea.Cursor = Cursors.None
        Case "Pen"
            DisplayArea.Cursor = Cursors.Pen
        Case "ScrollSE"
            DisplayArea.Cursor = Cursors.ScrollSE
        Case "ScrollWE"
            DisplayArea.Cursor = Cursors.ScrollWE
        Case "SizeAll"
            DisplayArea.Cursor = Cursors.SizeAll
        Case "SizeNESW"
            DisplayArea.Cursor = Cursors.SizeNESW
        Case "SizeNS"
            DisplayArea.Cursor = Cursors.SizeNS
        Case "SizeNWSE"
            DisplayArea.Cursor = Cursors.SizeNWSE
        Case "SizeWE"
            DisplayArea.Cursor = Cursors.SizeWE
        Case "UpArrow"
            DisplayArea.Cursor = Cursors.UpArrow
        Case "WaitCursor"
            DisplayArea.Cursor = Cursors.Wait
        Case "Custom"
            DisplayArea.Cursor = CustomCursor
    End Select

    ' if the cursor scope is set to the entire application
    ' use OverrideCursor to force the cursor for all elements
    If (cursorScopeElementOnly = False) Then
        Mouse.OverrideCursor = DisplayArea.Cursor
    End If


End Sub

注解

若要禁止关闭上下文菜单，事件的处理程序应将其标记为已处理。

若要将此事件用作 EventTrigger 样式中的 ，必须引用基础服务事件标识符：

<EventTrigger RoutedEvent="ContextMenuService.ContextMenuClosing">
  <!-- storyboard here ... -->
</EventTrigger>

(此用法是必需的，因为公开基础服务事件的 上的 FrameworkContentElement 事件实现无法正确映射 ContextMenuClosing 标识符，以便在触发器) 中使用。

路由事件信息

标识符字段	ContextMenuClosingEvent
路由策略	鼓 泡
委托	ContextMenuEventHandler

另请参阅

• ContextMenuService