frmmain.vb

图书管理系统能过完成基本的功能

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 MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents ToolBar1 As System.Windows.Forms.ToolBar
    Friend WithEvents ImageList1 As System.Windows.Forms.ImageList
    Friend WithEvents menuBuy As System.Windows.Forms.MenuItem
    Friend WithEvents menuPurchase As System.Windows.Forms.MenuItem
    Friend WithEvents menuFlow As System.Windows.Forms.MenuItem
    Friend WithEvents menuBorrow As System.Windows.Forms.MenuItem
    Friend WithEvents menuReLend As System.Windows.Forms.MenuItem
    Friend WithEvents menuReturn As System.Windows.Forms.MenuItem
    Friend WithEvents ToolBarButton0 As System.Windows.Forms.ToolBarButton
    Friend WithEvents ToolBarButton1 As System.Windows.Forms.ToolBarButton
    Friend WithEvents ToolBarButton2 As System.Windows.Forms.ToolBarButton
    Friend WithEvents ToolBarButton3 As System.Windows.Forms.ToolBarButton
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(Form1))
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.menuBuy = New System.Windows.Forms.MenuItem
        Me.menuPurchase = New System.Windows.Forms.MenuItem
        Me.menuFlow = New System.Windows.Forms.MenuItem
        Me.menuBorrow = New System.Windows.Forms.MenuItem
        Me.menuReLend = New System.Windows.Forms.MenuItem
        Me.menuReturn = New System.Windows.Forms.MenuItem
        Me.ToolBar1 = New System.Windows.Forms.ToolBar
        Me.ToolBarButton0 = New System.Windows.Forms.ToolBarButton
        Me.ToolBarButton1 = New System.Windows.Forms.ToolBarButton
        Me.ToolBarButton2 = New System.Windows.Forms.ToolBarButton
        Me.ToolBarButton3 = New System.Windows.Forms.ToolBarButton
        Me.ImageList1 = New System.Windows.Forms.ImageList(Me.components)
        Me.SuspendLayout()
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuBuy, Me.menuFlow})
        '
        'menuBuy
        '
        Me.menuBuy.Index = 0
        Me.menuBuy.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuPurchase})
        Me.menuBuy.Text = "图书采购"
        '
        'menuPurchase
        '
        Me.menuPurchase.Index = 0
        Me.menuPurchase.Text = "图书采购"
        '
        'menuFlow
        '
        Me.menuFlow.Index = 1
        Me.menuFlow.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.menuBorrow, Me.menuReLend, Me.menuReturn})
        Me.menuFlow.Text = "图书流通"
        '
        'menuBorrow
        '
        Me.menuBorrow.Index = 0
        Me.menuBorrow.Text = "借阅"
        '
        'menuReLend
        '
        Me.menuReLend.Index = 1
        Me.menuReLend.Text = "续借"
        '
        'menuReturn
        '
        Me.menuReturn.Index = 2
        Me.menuReturn.Text = "还书"
        '
        'ToolBar1
        '
        Me.ToolBar1.Appearance = System.Windows.Forms.ToolBarAppearance.Flat
        Me.ToolBar1.Buttons.AddRange(New System.Windows.Forms.ToolBarButton() {Me.ToolBarButton0, Me.ToolBarButton1, Me.ToolBarButton2, Me.ToolBarButton3})
        Me.ToolBar1.ButtonSize = New System.Drawing.Size(16, 16)
        Me.ToolBar1.DropDownArrows = True
        Me.ToolBar1.ImageList = Me.ImageList1
        Me.ToolBar1.Location = New System.Drawing.Point(0, 0)
        Me.ToolBar1.Name = "ToolBar1"
        Me.ToolBar1.ShowToolTips = True
        Me.ToolBar1.Size = New System.Drawing.Size(680, 44)
        Me.ToolBar1.TabIndex = 1
        '
        'ToolBarButton0
        '
        Me.ToolBarButton0.ImageIndex = 0
        Me.ToolBarButton0.ToolTipText = "图书采购"
        '
        'ToolBarButton1
        '
        Me.ToolBarButton1.Style = System.Windows.Forms.ToolBarButtonStyle.Separator
        '
        'ToolBarButton2
        '
        Me.ToolBarButton2.ImageIndex = 3
        Me.ToolBarButton2.ToolTipText = "图书借阅"
        '
        'ToolBarButton3
        '
        Me.ToolBarButton3.Style = System.Windows.Forms.ToolBarButtonStyle.Separator
        '
        'ImageList1
        '
        Me.ImageList1.ImageSize = New System.Drawing.Size(32, 32)
        Me.ImageList1.ImageStream = CType(resources.GetObject("ImageList1.ImageStream"), System.Windows.Forms.ImageListStreamer)
        Me.ImageList1.TransparentColor = System.Drawing.Color.Transparent
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.ClientSize = New System.Drawing.Size(680, 449)
        Me.Controls.Add(Me.ToolBar1)
        Me.IsMdiContainer = True
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "图书馆管理系统"
        Me.WindowState = System.Windows.Forms.FormWindowState.Maximized
        Me.ResumeLayout(False)

    End Sub

#End Region
    Public Function OpenOnce(ByVal frm As Form) As Boolean
        Dim mdifrm As Form
        For Each mdifrm In Me.MdiChildren
            If frm.Text = mdifrm.Text Then
                mdifrm.Activate() '子窗体获得焦点 激活
                Return False
                Exit Function
            End If
        Next
        Return True
    End Function

    Private Sub menuBorrow_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuBorrow.Click
        Dim frmLend As New frmUtterBook   '借阅实现代码  定义借阅类的实例
        If OpenOnce(frmLend) = True Then
            frmLend.MdiParent = Me
            frmLend.TabCtr.SelectedIndex = 0   '下标
            frmLend.Show()
        End If
    End Sub

    Private Sub menuReLend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuReLend.Click
        Dim frmLend As New frmUtterBook  '续借实现代码  定义借阅类的实例
        If OpenOnce(frmLend) = True Then
            frmLend.MdiParent = Me
            frmLend.TabCtr.SelectedIndex = 1
            frmLend.Show()
        End If
    End Sub

    Private Sub menuReturn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuReturn.Click
        Dim frmLend As New frmUtterBook()
        If OpenOnce(frmLend) = True Then
            frmLend.MdiParent = Me
            frmLend.TabCtr.SelectedIndex = 2
            frmLend.Show()
        End If
    End Sub
    Private Sub menuPurchase_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles menuPurchase.Click
        Dim frmBuy As New frmStockBook  '定义采购类的实例
        If OpenOnce(frmBuy) = True Then
            frmBuy.MdiParent = Me
            frmBuy.Show()
        End If
    End Sub
    Private Sub menuArrange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.LayoutMdi(MdiLayout.Cascade)
    End Sub

    Private Sub menuHorizion_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.LayoutMdi(MdiLayout.TileHorizontal)
    End Sub

    Private Sub menuVertical_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        Me.LayoutMdi(MdiLayout.TileVertical)
    End Sub

    Private Sub ToolBar1_ButtonClick(ByVal sender As System.Object, _
    ByVal e As System.Windows.Forms.ToolBarButtonClickEventArgs) _
    Handles ToolBar1.ButtonClick
        Select Case Me.ToolBar1.Buttons.IndexOf(e.Button)
            Case 0
                Me.menuPurchase.PerformClick()     '模仿button click事件
            Case 1
                Me.menuBorrow.PerformClick()
            Case 2
                Me.menuReturn.PerformClick()
            Case 3
                Me.menuReLend.PerformClick()
        End Select
    End Sub

    Private Sub Form1_Closing(ByVal sender As Object, _
    ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
        If MsgBox("您真的要退出图书馆管理系统吗？", _
        MsgBoxStyle.YesNo + MsgBoxStyle.Question, "退出系统") _
        = MsgBoxResult.Yes Then
            Application.Exit()
        Else
            e.Cancel = True
        End If
    End Sub
End Class