formstaytop.vb

Visual.Basic.NET实用编程百例-47.6M.zip

Public Class Formstaytop
    Inherits System.Windows.Forms.Form

#Region " Windows 窗体设计器生成的代码 "

    Public Sub New()
        MyBase.New()

        '该调用是 Windows 窗体设计器所必需的。
        InitializeComponent()

        '在 InitializeComponent() 调用之后添加任何初始化

    End Sub

    '窗体重写处置以清理组件列表。
    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

    'Windows 窗体设计器所必需的
    Private components As System.ComponentModel.IContainer

    '注意：以下过程是 Windows 窗体设计器所必需的
    '可以使用 Windows 窗体设计器修改此过程。
    '不要使用代码编辑器修改它。
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
    Friend WithEvents menu_top As System.Windows.Forms.MenuItem
    Friend WithEvents menu_exit As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Formstaytop))
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.MenuItem1 = New System.Windows.Forms.MenuItem
        Me.menu_top = New System.Windows.Forms.MenuItem
        Me.MenuItem3 = New System.Windows.Forms.MenuItem
        Me.menu_exit = New System.Windows.Forms.MenuItem
        Me.PictureBox1 = New System.Windows.Forms.PictureBox
        Me.SuspendLayout()
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menu_top, Me.MenuItem3, Me.menu_exit})
        Me.MenuItem1.Text = "操作"
        '
        'menu_top
        '
        Me.menu_top.Index = 0
        Me.menu_top.Text = "始终在前面"
        '
        'MenuItem3
        '
        Me.MenuItem3.Index = 1
        Me.MenuItem3.Text = "-"
        '
        'menu_exit
        '
        Me.menu_exit.Index = 2
        Me.menu_exit.Text = "退出"
        '
        'PictureBox1
        '
        Me.PictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D
        Me.PictureBox1.Image = CType(resources.GetObject("PictureBox1.Image"), System.Drawing.Image)
        Me.PictureBox1.Location = New System.Drawing.Point(8, 8)
        Me.PictureBox1.Name = "PictureBox1"
        Me.PictureBox1.Size = New System.Drawing.Size(280, 220)
        Me.PictureBox1.TabIndex = 0
        Me.PictureBox1.TabStop = False
        '
        'Formstaytop
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(294, 235)
        Me.Controls.Add(Me.PictureBox1)
        Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
        Me.HelpButton = True
        Me.MaximizeBox = False
        Me.Menu = Me.MainMenu1
        Me.MinimizeBox = False
        Me.Name = "Formstaytop"
        Me.Text = "始终在前面的窗口"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Const HWND_TOPMOST = -1
    Private Const HWND_NOTOPMOST = -2
    Private Const SWP_SHOWWINDOW = &H40
    '定义函数中使用的常量
    Dim myhwnd As Integer
    '定义变量保存窗口的句柄

    Private Sub formstaytop_Paint(ByVal sender As Object, _
    ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        myhwnd = GetActiveWindow()
        '取得窗口句柄
    End Sub
    Private Sub menu_top_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menu_top.Click
        Dim mtop
        If menu_top.Checked = False Then
            mtop = SetWindowPos(myhwnd, -1, 0, 0, 300, 280, &H40)
            menu_top.Checked = True
        Else
            mtop = SetWindowPos(myhwnd, -2, 0, 0, 300, 280, &H40)
            menu_top.Checked = False
        End If
        '单击该菜单项，则改变该菜单项的Checked属性
        '并相应设置窗口是否在最顶层
    End Sub

    Private Sub menu_exit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menu_exit.Click
        Close()
        '结束程序
    End Sub

    Private Sub formstaytop_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub
End Class