form1.vb

编程之道VB.NETt程序设计入门-589M.zip

Public Class Form1
    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 MainMenu As System.Windows.Forms.MainMenu
    Friend WithEvents MenuItem1 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem2 As System.Windows.Forms.MenuItem
    Friend WithEvents MenuItem3 As System.Windows.Forms.MenuItem
    Friend WithEvents lstBehavior As System.Windows.Forms.ListBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents treAddTo As System.Windows.Forms.TreeView
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents txtNewText As System.Windows.Forms.TextBox
    Friend WithEvents btnAddItem As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.MainMenu = New System.Windows.Forms.MainMenu()
        Me.MenuItem1 = New System.Windows.Forms.MenuItem()
        Me.MenuItem2 = New System.Windows.Forms.MenuItem()
        Me.MenuItem3 = New System.Windows.Forms.MenuItem()
        Me.lstBehavior = New System.Windows.Forms.ListBox()
        Me.Label3 = New System.Windows.Forms.Label()
        Me.treAddTo = New System.Windows.Forms.TreeView()
        Me.Label2 = New System.Windows.Forms.Label()
        Me.Label1 = New System.Windows.Forms.Label()
        Me.txtNewText = New System.Windows.Forms.TextBox()
        Me.btnAddItem = New System.Windows.Forms.Button()
        Me.SuspendLayout()
        '
        'MainMenu
        '
        Me.MainMenu.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.MenuItem1, Me.MenuItem2, Me.MenuItem3})
        '
        'MenuItem1
        '
        Me.MenuItem1.Index = 0
        Me.MenuItem1.Text = "菜单1"
        '
        'MenuItem2
        '
        Me.MenuItem2.Index = 1
        Me.MenuItem2.Text = "菜单2"
        '
        'MenuItem3
        '
        Me.MenuItem3.Index = 2
        Me.MenuItem3.Text = "菜单3"
        '
        'lstBehavior
        '
        Me.lstBehavior.ItemHeight = 12
        Me.lstBehavior.Location = New System.Drawing.Point(88, 64)
        Me.lstBehavior.Name = "lstBehavior"
        Me.lstBehavior.Size = New System.Drawing.Size(136, 112)
        Me.lstBehavior.TabIndex = 13
        '
        'Label3
        '
        Me.Label3.Location = New System.Drawing.Point(56, 64)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(32, 16)
        Me.Label3.TabIndex = 12
        Me.Label3.Text = "行为"
        '
        'treAddTo
        '
        Me.treAddTo.ImageIndex = -1
        Me.treAddTo.Location = New System.Drawing.Point(280, 24)
        Me.treAddTo.Name = "treAddTo"
        Me.treAddTo.SelectedImageIndex = -1
        Me.treAddTo.Size = New System.Drawing.Size(152, 152)
        Me.treAddTo.TabIndex = 11
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(232, 32)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(48, 16)
        Me.Label2.TabIndex = 10
        Me.Label2.Text = "添加到"
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 32)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(80, 16)
        Me.Label1.TabIndex = 9
        Me.Label1.Text = "新菜单项文字"
        '
        'txtNewText
        '
        Me.txtNewText.Location = New System.Drawing.Point(88, 24)
        Me.txtNewText.Name = "txtNewText"
        Me.txtNewText.Size = New System.Drawing.Size(136, 21)
        Me.txtNewText.TabIndex = 8
        Me.txtNewText.Text = ""
        '
        'btnAddItem
        '
        Me.btnAddItem.Location = New System.Drawing.Point(168, 192)
        Me.btnAddItem.Name = "btnAddItem"
        Me.btnAddItem.Size = New System.Drawing.Size(80, 24)
        Me.btnAddItem.TabIndex = 7
        Me.btnAddItem.Text = "添加菜单项"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(448, 225)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.lstBehavior, Me.Label3, Me.treAddTo, Me.Label2, Me.Label1, Me.txtNewText, Me.btnAddItem})
        Me.Menu = Me.MainMenu
        Me.Name = "Form1"
        Me.Text = "Form1"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Handlers(2) As EventHandler

    Private Sub ShowMenuItemText(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim mnitmClicked As MenuItem

        mnitmClicked = CType(sender, MenuItem)
        MessageBox.Show(mnitmClicked.Text)
    End Sub

    Private Sub ShowHello(ByVal sender As System.Object, ByVal e As System.EventArgs)
        MessageBox.Show("Hello")
    End Sub

    Private Sub ShowMenuItemIndex(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Dim mnitmClicked As MenuItem

        mnitmClicked = CType(sender, MenuItem)
        MessageBox.Show(mnitmClicked.Index)
    End Sub

    Private Sub MenuItemToNode(ByVal menuItems As Menu.MenuItemCollection, ByVal targetNodes As TreeNodeCollection)
        Dim subItem As MenuItem

        For Each subItem In menuItems
            Dim subNode As New TreeNode(subItem.Text)
            If subItem.MenuItems.Count > 0 Then
                MenuItemToNode(subItem.MenuItems, subNode.Nodes)
            End If
            targetNodes.Add(subNode)
        Next
    End Sub

    Private Function FindMenuItem(ByVal selectedNode As TreeNode) As MenuItem
        Dim indexStack As New Collections.Stack()

        Do Until selectedNode Is Nothing
            indexStack.Push(selectedNode.Index)
            selectedNode = selectedNode.Parent
        Loop

        Dim menuItem As MenuItem = MainMenu.MenuItems(indexStack.Pop())
        Do Until indexStack.Count = 0
            menuItem = menuItem.MenuItems(indexStack.Pop())
        Loop

        Return menuItem
    End Function

    Private Sub btnAddItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddItem.Click
        If txtNewText.Text = "" Then Exit Sub
        If treAddTo.SelectedNode Is Nothing Then Exit Sub

        Dim correspondingMenuItem, newMenuItem As MenuItem
        correspondingMenuItem = FindMenuItem(treAddTo.SelectedNode)

        newMenuItem = New MenuItem(txtNewText.Text)
        If lstBehavior.SelectedIndex >= 0 Then
            AddHandler newMenuItem.Click, Handlers(lstBehavior.SelectedIndex)
        End If

        correspondingMenuItem.MenuItems.Add(newMenuItem)

        treAddTo.Nodes.Clear()
        MenuItemToNode(MainMenu.MenuItems, treAddTo.Nodes)
        treAddTo.ExpandAll()
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        MenuItemToNode(MainMenu.MenuItems, treAddTo.Nodes)
        treAddTo.ExpandAll()

        Handlers(0) = AddressOf ShowHello
        Handlers(1) = AddressOf ShowMenuItemText
        Handlers(2) = AddressOf ShowMenuItemIndex

        Dim i As Integer
        For i = 0 To Handlers.Length - 1
            lstBehavior.Items.Add(Handlers(i).Method.Name)
        Next
    End Sub
End Class