VB.Net Tutorial/GUI Applications/Dynamic Menu — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 15:56, 26 мая 2010
<source lang="vbnet">"Visual Basic 2005 Programmer"s Reference "by Rod Stephens (Author) "# Publisher: Wrox (October 21, 2005) "# Language: English "# ISBN-10: 0764571982 "# ISBN-13: 978-0764571985 Imports System.Windows.Forms Imports System.IO public class DynamicMenuItemForFileMenu
public Shared Sub Main Application.Run(New Form1) End Sub
End class
Public Class MruList
Private m_ApplicationName As String Private m_FileMenu As ToolStripMenuItem Private m_NumEntries As Integer Private m_FileNames As Collection Private m_MenuItems As Collection Public Event OpenFile(ByVal file_name As String) Public Sub New(ByVal application_name As String, ByVal file_menu As ToolStripMenuItem, ByVal num_entries As Integer) m_ApplicationName = application_name m_FileMenu = file_menu m_NumEntries = num_entries m_FileNames = New Collection m_MenuItems = New Collection " Load saved file names from the Registry. LoadMruList() " Display the MRU list. DisplayMruList() End Sub " Load previously saved file names from the Registry. Private Sub LoadMruList() Dim file_name As String For i As Integer = 1 To m_NumEntries " Get the next file name and title. file_name = GetSetting(m_ApplicationName, _ "MruList", "FileName" & i, "") " See if we got anything. If file_name.Length > 0 Then " Save this file name. m_FileNames.Add(file_name, file_name) End If Next i End Sub " Save the MRU list into the Registry. Private Sub SaveMruList() " Remove previous entries. If GetSetting(m_ApplicationName, "MruList", _ "FileName1", "").Length > 0 Then DeleteSetting(m_ApplicationName, "MruList") End If " Make the new entries. For i As Integer = 1 To m_FileNames.Count SaveSetting(m_ApplicationName, _ "MruList", "FileName" & i, _ m_FileNames(i).ToString) Next i End Sub " Display the MRU list. Private Sub DisplayMruList() " Remove old menu items from the File menu. For Each mnu As ToolStripItem In m_MenuItems m_FileMenu.DropDownItems.Remove(mnu) Next mnu m_MenuItems = New Collection " See if we have any file names. If m_FileNames.Count > 0 Then " Make the separator. Dim sep As New ToolStripSeparator() m_MenuItems.Add(sep) m_FileMenu.DropDownItems.Add(sep) " Make the other menu items. Dim mnu As ToolStripMenuItem For i As Integer = 1 To m_FileNames.Count mnu = New ToolStripMenuItem() mnu.Text = "&" & i & " " & _ New FileInfo(m_FileNames(i).ToString).Name AddHandler mnu.Click, AddressOf MruItem_Click m_MenuItems.Add(mnu) m_FileMenu.DropDownItems.Add(mnu) Next i End If End Sub " MRU menu item event handler. Private Sub MruItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Dim mnu As ToolStripMenuItem mnu = DirectCast(sender, ToolStripMenuItem) " Find the menu item that raised this event. For i As Integer = 1 To m_FileNames.Count " See if this is the item. (Add 1 for the separator.) If m_MenuItems(i + 1) Is mnu Then " This is the item. Raise the OpenFile " event for its file name. RaiseEvent OpenFile(m_FileNames(i).ToString) Exit For End If Next i End Sub " Add a file to the MRU list. Public Sub Add(ByVal file_name As String) " Remove this file from the MRU list " if it is present. Dim i As Integer = FileNameIndex(file_name) If i > 0 Then m_FileNames.Remove(i) " Add the item to the begining of the list. If m_FileNames.Count > 0 Then m_FileNames.Add(file_name, file_name, m_FileNames.Item(1)) Else m_FileNames.Add(file_name, file_name) End If " If the list is too long, remove the last item. If m_FileNames.Count > m_NumEntries Then m_FileNames.Remove(m_NumEntries + 1) End If " Display the list. DisplayMruList() " Save the updated list. SaveMruList() End Sub " Return the index of this file in the list. Private Function FileNameIndex(ByVal file_name As String) As Integer For i As Integer = 1 To m_FileNames.Count If m_FileNames(i).ToString = file_name Then Return i Next i Return 0 End Function " Remove a file from the MRU list. Public Sub Remove(ByVal file_name As String) " See if the file is present. Dim i As Integer = FileNameIndex(file_name) If i > 0 Then " Remove the File. m_FileNames.Remove(i) " Display the list. DisplayMruList() " Save the updated list. SaveMruList() End If End Sub
End Class Public Class Form1
Private WithEvents m_MruList As MruList " Initialize the MRU list. Private Sub Form1_Load(ByVal sender As Object, _ ByVal e As System.EventArgs) Handles Me.Load m_MruList = New MruList("SdiMruList", mnuFile, 4) End Sub " Let the user open a file. Private Sub mnuFileOpen_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles mnuFileOpen.Click If dlgOpen.ShowDialog() = Windows.Forms.DialogResult.OK Then OpenFile(dlgOpen.FileName) End If End Sub " Open a file selected from the MRU list. Private Sub m_MruList_OpenFile(ByVal file_name As String) _ Handles m_MruList.OpenFile OpenFile(file_name) End Sub " Open a file and add it to the MRU list. Private Sub OpenFile(ByVal file_name As String) txtContents.Text = File.ReadAllText(file_name) txtContents.Select(0, 0) m_MruList.Add(file_name) Me.Text = "SdiEditMRU [" & New FileInfo(file_name).Name & "]" End Sub
End Class <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1
Inherits System.Windows.Forms.Form "Form overrides dispose to clean up the component list. <System.Diagnostics.DebuggerNonUserCode()> _ Protected Overrides Sub Dispose(ByVal disposing As Boolean) If disposing AndAlso components IsNot Nothing Then components.Dispose() End If MyBase.Dispose(disposing) End Sub "Required by the Windows Form Designer Private components As System.ruponentModel.IContainer "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. <System.Diagnostics.DebuggerStepThrough()> _ Private Sub InitializeComponent() Me.MenuStrip1 = New System.Windows.Forms.MenuStrip Me.mnuFile = New System.Windows.Forms.ToolStripMenuItem Me.mnuFileOpen = New System.Windows.Forms.ToolStripMenuItem Me.txtContents = New System.Windows.Forms.TextBox Me.dlgOpen = New System.Windows.Forms.OpenFileDialog Me.MenuStrip1.SuspendLayout() Me.SuspendLayout() " "MenuStrip1 " Me.MenuStrip1.Items.AddRange(New System.Windows.Forms.ToolStripItem() {Me.mnuFile}) Me.MenuStrip1.Location = New System.Drawing.Point(0, 0) Me.MenuStrip1.Name = "MenuStrip1" Me.MenuStrip1.Size = New System.Drawing.Size(292, 24) Me.MenuStrip1.TabIndex = 9 Me.MenuStrip1.Text = "MenuStrip1" " "mnuFile " Me.mnuFile.DropDownItems.AddRange(New System.Windows.Forms.ToolStripItem() {Me.mnuFileOpen}) Me.mnuFile.Name = "mnuFile" Me.mnuFile.Size = New System.Drawing.Size(44, 20) Me.mnuFile.Text = "&File" " "mnuFileOpen " Me.mnuFileOpen.Name = "mnuFileOpen" Me.mnuFileOpen.ShortcutKeys = CType((System.Windows.Forms.Keys.Control Or System.Windows.Forms.Keys.O), System.Windows.Forms.Keys) Me.mnuFileOpen.Size = New System.Drawing.Size(168, 22) Me.mnuFileOpen.Text = "&Open" " "txtContents " Me.txtContents.Anchor = CType((((System.Windows.Forms.AnchorStyles.Top Or System.Windows.Forms.AnchorStyles.Bottom) _ Or System.Windows.Forms.AnchorStyles.Left) _ Or System.Windows.Forms.AnchorStyles.Right), System.Windows.Forms.AnchorStyles) Me.txtContents.Location = New System.Drawing.Point(0, 24) Me.txtContents.Multiline = True Me.txtContents.Name = "txtContents" Me.txtContents.Size = New System.Drawing.Size(292, 249) Me.txtContents.TabIndex = 8 " "Form1 " Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!) Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font Me.ClientSize = New System.Drawing.Size(292, 273) Me.Controls.Add(Me.txtContents) Me.Controls.Add(Me.MenuStrip1) Me.Name = "Form1" Me.Text = "SdiEditMRU []" Me.MenuStrip1.ResumeLayout(False) Me.MenuStrip1.PerformLayout() Me.ResumeLayout(False) Me.PerformLayout() End Sub Friend WithEvents MenuStrip1 As System.Windows.Forms.MenuStrip Friend WithEvents mnuFile As System.Windows.Forms.ToolStripMenuItem Friend WithEvents mnuFileOpen As System.Windows.Forms.ToolStripMenuItem Friend WithEvents txtContents As System.Windows.Forms.TextBox Friend WithEvents dlgOpen As System.Windows.Forms.OpenFileDialog
End Class</source>