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VB.NET ToolStripDropDown.Opening事件代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了VB.NET中System.Windows.Forms.ToolStripDropDown.Opening事件的典型用法代码示例。如果您正苦于以下问题:VB.NET ToolStripDropDown.Opening事件的具体用法?VB.NET ToolStripDropDown.Opening怎么用?VB.NET ToolStripDropDown.Opening使用的例子?那么恭喜您, 这里精选的事件代码示例或许可以为您提供帮助。您也可以进一步了解该事件所在System.Windows.Forms.ToolStripDropDown的用法示例。



在下文中一共展示了ToolStripDropDown.Opening事件的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的VB.NET代码示例。

示例1: Form3

' This code example demonstrates how to handle the Opening event.
' It also demonstrates dynamic item addition and dynamic 
' SourceControl determination with reuse.
Class Form3
    Inherits Form

   ' Declare the ContextMenuStrip control.
   Private fruitContextMenuStrip As ContextMenuStrip
   
   
   Public Sub New()
      ' Create a new ContextMenuStrip control.
      fruitContextMenuStrip = New ContextMenuStrip()
      
      ' Attach an event handler for the 
      ' ContextMenuStrip control's Opening event.
      AddHandler fruitContextMenuStrip.Opening, AddressOf cms_Opening
      
      ' Create a new ToolStrip control.
      Dim ts As New ToolStrip()
      
      ' Create a ToolStripDropDownButton control and add it
      ' to the ToolStrip control's Items collections.
      Dim fruitToolStripDropDownButton As New ToolStripDropDownButton("Fruit", Nothing, Nothing, "Fruit")
      ts.Items.Add(fruitToolStripDropDownButton)
      
      ' Dock the ToolStrip control to the top of the form.
      ts.Dock = DockStyle.Top
      
      ' Assign the ContextMenuStrip control as the 
      ' ToolStripDropDownButton control's DropDown menu.
      fruitToolStripDropDownButton.DropDown = fruitContextMenuStrip
      
      ' Create a new MenuStrip control and add a ToolStripMenuItem.
      Dim ms As New MenuStrip()
      Dim fruitToolStripMenuItem As New ToolStripMenuItem("Fruit", Nothing, Nothing, "Fruit")
      ms.Items.Add(fruitToolStripMenuItem)
      
      ' Dock the MenuStrip control to the top of the form.
      ms.Dock = DockStyle.Top
      
      ' Assign the MenuStrip control as the 
      ' ToolStripMenuItem's DropDown menu.
      fruitToolStripMenuItem.DropDown = fruitContextMenuStrip
      
      ' Assign the ContextMenuStrip to the form's 
      ' ContextMenuStrip property.
      Me.ContextMenuStrip = fruitContextMenuStrip
      
      ' Add the ToolStrip control to the Controls collection.
        Me.Controls.Add(ts)

        'Add a button to the form and assign its ContextMenuStrip.
        Dim b As New Button()
        b.Location = New System.Drawing.Point(60, 60)
        Me.Controls.Add(b)
        b.ContextMenuStrip = fruitContextMenuStrip
      
      ' Add the MenuStrip control last.
      ' This is important for correct placement in the z-order.
      Me.Controls.Add(ms)
    End Sub
   
   ' This event handler is invoked when the ContextMenuStrip
   ' control's Opening event is raised. It demonstrates
   ' dynamic item addition and dynamic SourceControl 
   ' determination with reuse.
    Sub cms_Opening(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs)

        ' Acquire references to the owning control and item.
        Dim c As Control = fruitContextMenuStrip.SourceControl
        Dim tsi As ToolStripDropDownItem = fruitContextMenuStrip.OwnerItem 

        ' Clear the ContextMenuStrip control's 
        ' Items collection.
        fruitContextMenuStrip.Items.Clear()

        ' Check the source control first.
        If (c IsNot Nothing) Then
            ' Add custom item (Form)
            fruitContextMenuStrip.Items.Add(("Source: " + c.GetType().ToString()))
        ElseIf (tsi IsNot Nothing) Then
            ' Add custom item (ToolStripDropDownButton or ToolStripMenuItem)
            fruitContextMenuStrip.Items.Add(("Source: " + tsi.GetType().ToString()))
        End If

        ' Populate the ContextMenuStrip control with its default items.
        fruitContextMenuStrip.Items.Add("-")
        fruitContextMenuStrip.Items.Add("Apples")
        fruitContextMenuStrip.Items.Add("Oranges")
        fruitContextMenuStrip.Items.Add("Pears")

        ' Set Cancel to false. 
        ' It is optimized to true based on empty entry.
        e.Cancel = False
    End Sub
End Class
开发者ID:VB.NET开发者,项目名称:System.Windows.Forms,代码行数:97,代码来源:ToolStripDropDown.Opening



注:本文中的System.Windows.Forms.ToolStripDropDown.Opening事件示例由纯净天空整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。


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