VB.NET ListBox.TopIndex属性代码示例

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

在下文中一共展示了ListBox.TopIndex属性的2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: RemoveTopItems

Private Sub RemoveTopItems()
   ' Determine if the currently selected item in the ListBox 
   ' is the item displayed at the top in the ListBox.
   If listBox1.TopIndex <> listBox1.SelectedIndex Then
      ' Make the currently selected item the top item in the ListBox.
      listBox1.TopIndex = listBox1.SelectedIndex
   End If
   ' Remove all items before the top item in the ListBox.
   Dim x As Integer
   For x = listBox1.SelectedIndex - 1 To 0 Step -1
      listBox1.Items.RemoveAt(x)
   Next x

   ' Clear all selections in the ListBox.
   listBox1.ClearSelected()
End Sub

开发者ID:VB.NET开发者，项目名称:System.Windows.Forms，代码行数:16，代码来源:ListBox.TopIndex

示例2: MainClass

' 导入命名空间
Imports System
Imports System.Windows.Forms


Public Class MainClass
    
    Shared Sub Main()
        Dim form1 As Form = New Form1

        Application.Run(form1)


    End Sub
End Class

Public Class Form1
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents txt As System.Windows.Forms.TextBox
    Friend WithEvents pic As System.Windows.Forms.PictureBox
    Friend WithEvents lstLog As System.Windows.Forms.ListBox
    Friend WithEvents cmd As System.Windows.Forms.Button
    Friend WithEvents Label3 As System.Windows.Forms.Label

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents Label4 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.txt = New System.Windows.Forms.TextBox()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.lstLog = New System.Windows.Forms.ListBox()
        Me.pic = New System.Windows.Forms.PictureBox()
        Me.cmd = New System.Windows.Forms.Button()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.GroupBox1 = New System.Windows.Forms.GroupBox()
        Me.Label4 = New System.Windows.Forms.Label()
        Me.GroupBox1.SuspendLayout()
        Me.SuspendLayout()
        '
        'txt
        '
        Me.txt.Location = New System.Drawing.Point(156, 20)
        Me.txt.Name = "txt"
        Me.txt.Size = New System.Drawing.Size(192, 21)
        Me.txt.TabIndex = 1
        Me.txt.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(6, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(144, 16)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "Test keyboard events here:"
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(20, 52)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(128, 16)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Test mouse events here:"
        '
        'lstLog
        '
        Me.lstLog.Anchor = (((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _
                    Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.lstLog.IntegralHeight = False
        Me.lstLog.Location = New System.Drawing.Point(8, 160)
        Me.lstLog.Name = "lstLog"
        Me.lstLog.Size = New System.Drawing.Size(384, 212)
        Me.lstLog.TabIndex = 0
        '
        'pic
        '
        Me.pic.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.pic.Location = New System.Drawing.Point(156, 48)
        Me.pic.Name = "pic"
        Me.pic.Size = New System.Drawing.Size(192, 48)
        Me.pic.TabIndex = 3
        Me.pic.TabStop = False
        '
        'cmd
        '
        Me.cmd.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.cmd.Location = New System.Drawing.Point(156, 100)
        Me.cmd.Name = "cmd"
        Me.cmd.Size = New System.Drawing.Size(88, 28)
        Me.cmd.TabIndex = 4
        Me.cmd.Text = "Button1"
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(24, 104)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(64, 24)
        Me.Label3.TabIndex = 5
        Me.Label3.Text = "Label3"
        '
        'GroupBox1
        '
        Me.GroupBox1.Anchor = ((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Left) _
                    Or System.Windows.Forms.AnchorStyles.Right)
        Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label4, Me.Label1, Me.pic, Me.txt, Me.cmd, Me.Label2})
        Me.GroupBox1.FlatStyle = System.Windows.Forms.FlatStyle.System
        Me.GroupBox1.Location = New System.Drawing.Point(8, 4)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(384, 148)
        Me.GroupBox1.TabIndex = 6
        Me.GroupBox1.TabStop = False
        '
        'Label4
        '
        Me.Label4.Location = New System.Drawing.Point(92, 108)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(56, 16)
        Me.Label4.TabIndex = 5
        Me.Label4.Text = "And here:"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
        Me.ClientSize = New System.Drawing.Size(400, 378)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.Label3, Me.lstLog})
        Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Name = "Form1"
        Me.Text = "Event Tracker"
        Me.GroupBox1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region


    Private Sub pic_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles pic.MouseEnter, cmd.MouseEnter
        Log("Mouse Enter")
    End Sub

    Private Sub pic_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles pic.MouseMove
        log("Mouse Move: " )
    End Sub

    Private Sub Log(ByVal data As String)
        lstLog.Items.Add(data)
        Dim ItemsPerPage As Integer = lstLog.Height \ lstLog.ItemHeight
        lstLog.TopIndex = lstLog.Items.Count - ItemsPerPage
    End Sub
End Class

开发者ID:VB程序员，项目名称:System.Windows.Forms，代码行数:180，代码来源:ListBox.TopIndex

注：本文中的System.Windows.Forms.ListBox.TopIndex属性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。