FrameworkContentElement.ContextMenuClosing 事件
定义
重要
一些信息与预发行产品相关,相应产品在发行之前可能会进行重大修改。 对于此处提供的信息,Microsoft 不作任何明示或暗示的担保。
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
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 == false)
{
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 |