frmmain.vb

visual Basic 数据库开发实例导航

Public Class frmMain
    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 dispose 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 StatusBar As System.Windows.Forms.StatusBar
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents mnReader As System.Windows.Forms.MenuItem
    Friend WithEvents mnReaderType As System.Windows.Forms.MenuItem
    Friend WithEvents mnReaderDoc As System.Windows.Forms.MenuItem
    Friend WithEvents mnBook As System.Windows.Forms.MenuItem
    Friend WithEvents mnBookType As System.Windows.Forms.MenuItem
    Friend WithEvents mnBookDoc As System.Windows.Forms.MenuItem
    Friend WithEvents mnManage As System.Windows.Forms.MenuItem
    Friend WithEvents mnBuy As System.Windows.Forms.MenuItem
    Friend WithEvents mnBorrow As System.Windows.Forms.MenuItem
    Friend WithEvents mnReturn As System.Windows.Forms.MenuItem
    Friend WithEvents mnList As System.Windows.Forms.MenuItem
    Friend WithEvents mnMoney As System.Windows.Forms.MenuItem
    Friend WithEvents mnExit As System.Windows.Forms.MenuItem
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(frmMain))
        Me.StatusBar = New System.Windows.Forms.StatusBar
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.mnReader = New System.Windows.Forms.MenuItem
        Me.mnReaderType = New System.Windows.Forms.MenuItem
        Me.mnReaderDoc = New System.Windows.Forms.MenuItem
        Me.mnBook = New System.Windows.Forms.MenuItem
        Me.mnBookType = New System.Windows.Forms.MenuItem
        Me.mnBookDoc = New System.Windows.Forms.MenuItem
        Me.mnManage = New System.Windows.Forms.MenuItem
        Me.mnBuy = New System.Windows.Forms.MenuItem
        Me.mnBorrow = New System.Windows.Forms.MenuItem
        Me.mnReturn = New System.Windows.Forms.MenuItem
        Me.mnList = New System.Windows.Forms.MenuItem
        Me.mnMoney = New System.Windows.Forms.MenuItem
        Me.mnExit = New System.Windows.Forms.MenuItem
        Me.SuspendLayout()
        '
        'StatusBar
        '
        Me.StatusBar.Location = New System.Drawing.Point(0, 257)
        Me.StatusBar.Name = "StatusBar"
        Me.StatusBar.Size = New System.Drawing.Size(488, 16)
        Me.StatusBar.SizingGrip = False
        Me.StatusBar.TabIndex = 3
        Me.StatusBar.Text = "数据库开发经典实例解析  清华大学出版社 用户登陆功能和权限管理功能参考进销存实例"
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnReader, Me.mnBook, Me.mnManage, Me.mnExit})
        '
        'mnReader
        '
        Me.mnReader.Index = 0
        Me.mnReader.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnReaderType, Me.mnReaderDoc})
        Me.mnReader.Text = "读者管理(&W)"
        '
        'mnReaderType
        '
        Me.mnReaderType.Index = 0
        Me.mnReaderType.Text = "读者类别设置(&Y)"
        '
        'mnReaderDoc
        '
        Me.mnReaderDoc.Index = 1
        Me.mnReaderDoc.Text = "读者档案管理(&Z)"
        '
        'mnBook
        '
        Me.mnBook.Index = 1
        Me.mnBook.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnBookType, Me.mnBookDoc})
        Me.mnBook.Text = "图书管理(&X)"
        '
        'mnBookType
        '
        Me.mnBookType.Index = 0
        Me.mnBookType.Text = "图书类别设置(&Y)"
        '
        'mnBookDoc
        '
        Me.mnBookDoc.Index = 1
        Me.mnBookDoc.Text = "图书档案管理(&Z)"
        '
        'mnManage
        '
        Me.mnManage.Index = 2
        Me.mnManage.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnBuy, Me.mnBorrow, Me.mnReturn, Me.mnList, Me.mnMoney})
        Me.mnManage.Text = "流通管理(&Y)"
        '
        'mnBuy
        '
        Me.mnBuy.Index = 0
        Me.mnBuy.Text = "图书征订(&V)"
        '
        'mnBorrow
        '
        Me.mnBorrow.Index = 1
        Me.mnBorrow.Text = "图书借阅(&W)"
        '
        'mnReturn
        '
        Me.mnReturn.Index = 2
        Me.mnReturn.Text = "图书归还(&X)"
        '
        'mnList
        '
        Me.mnList.Index = 3
        Me.mnList.Text = "逾期清单(&Y)"
        '
        'mnMoney
        '
        Me.mnMoney.Index = 4
        Me.mnMoney.Text = "图书罚款(&Z)"
        '
        'mnExit
        '
        Me.mnExit.Index = 3
        Me.mnExit.Text = "退出系统(&Z)"
        '
        'frmMain
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(488, 273)
        Me.Controls.Add(Me.StatusBar)
        Me.Icon = CType(resources.GetObject("$this.Icon"), System.Drawing.Icon)
        Me.IsMdiContainer = True
        Me.Menu = Me.MainMenu1
        Me.Name = "frmMain"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "图书管理系统"
        Me.ResumeLayout(False)

    End Sub

#End Region
    Private Function GetInstanceState(ByVal name As String) As Boolean
        '获得frmMain窗体的子窗体的数量
        Dim i As Integer = Me.MdiChildren.Length
        '循环判断是否有名为name的子窗体实例
        For i = 0 To Me.MdiChildren.Length - 1
            If Me.MdiChildren(i).Name = name Then
                '存在名为name的子窗体，是子窗体获得焦点并返回True
                Me.MdiChildren(i).Focus()
                Return True
            End If
        Next
        '不存在名为Name的子窗体False
        Return False
    End Function


    Private Sub mnReaderType_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnReaderType.Click
        If GetInstanceState("frmReaderType") Then
            Exit Sub
        End If
        Dim childFrm As frmReaderType = New frmReaderType
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnReaderDoc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnReaderDoc.Click
        If GetInstanceState("frmReaderDoc") Then
            Exit Sub
        End If
        Dim childFrm As frmReaderDoc = New frmReaderDoc
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnBookType_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnBookType.Click
        If GetInstanceState("frmBookType") Then
            Exit Sub
        End If
        Dim childFrm As frmBookType = New frmBookType
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnBookDoc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnBookDoc.Click
        If GetInstanceState("frmBookDoc") Then
            Exit Sub
        End If
        Dim childFrm As frmBookDoc = New frmBookDoc
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnBuy_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnBuy.Click
        If GetInstanceState("frmBuyBook") Then
            Exit Sub
        End If
        Dim childFrm As frmBuyBook = New frmBuyBook
        childFrm.MdiParent = Me
        childFrm.Show()

    End Sub

    Private Sub mnBorrow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnBorrow.Click
        If GetInstanceState("frmBorrow") Then
            Exit Sub
        End If
        Dim childFrm As frmBorrow = New frmBorrow
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnList_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnList.Click
        If GetInstanceState("frmList") Then
            Exit Sub
        End If
        Dim childFrm As frmList = New frmList
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnMoney_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnMoney.Click
        If GetInstanceState("frmMoney") Then
            Exit Sub
        End If
        Dim childFrm As frmMoney = New frmMoney
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnReturn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnReturn.Click
        If GetInstanceState("frmReturn") Then
            Exit Sub
        End If
        Dim childFrm As frmReturn = New frmReturn
        childFrm.MdiParent = Me
        childFrm.Show()
    End Sub

    Private Sub mnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnExit.Click
        Application.Exit()
    End Sub
End Class