Namespace Microsoft.Samples.WinForms.VB.Menus

Public Class Menus
Inherits System.WinForms.Form

Private components As System.ComponentModel.Container
Private label1 As System.WinForms.Label
Private mainMenu As System.WinForms.MainMenu
Private label1ContextMenu As System.WinForms.ContextMenu

Private Class FontSizes
public shared Small As Single = 8f
public shared Medium As Single = 12f
public shared Large As Single = 24f
End Class

'Font face and size
Private fontFace As String = "Arial"
Private fontSize As Single = FontSizes.Medium

'Used to track which menu items are checked/unchecked
Private mmiArial As MenuItem
Private mmiTimesNewRoman As MenuItem
Private mmiCourier As MenuItem
Private mmiSmall As MenuItem
Private mmiMedium As MenuItem
Private mmiLarge As MenuItem
Private cmiArial As MenuItem
Private cmiTimesNewRoman As MenuItem
Private cmiCourier As MenuItem
Private cmiSmall As MenuItem
Private cmiMedium As MenuItem
Private cmiLarge As MenuItem

Private miMainFormatFontChecked As MenuItem
Private miMainFormatSizeChecked As MenuItem
Private miContextFormatFontChecked As MenuItem
Private miContextFormatSizeChecked As MenuItem

Public Sub New()

MyBase.New

' Required by the Windows Forms Designer
InitializeComponent

' TODO: Add any constructor code after InitializeComponent call

label1.Font = new Font(fontFace, fontSize)

'Add File Menu
Dim miFile As MenuItem = mainMenu.MenuItems.Add("&File")
miFile.MenuItems.Add(new MenuItem("&Open...", new EventHandler(AddressOf Me.FileOpen_Clicked), Shortcut.CtrlO))
miFile.MenuItems.Add("-") ' Gives us a seperator
miFile.MenuItems.Add(new MenuItem("E&xit", new EventHandler(AddressOf Me.FileExit_Clicked), Shortcut.CtrlX))

'Add Format Menu
Dim miFormat As MenuItem = mainMenu.MenuItems.Add("F&ormat")

'Font Face sub-menu
mmiArial = new MenuItem("&Arial", AddressOf Me.FormatFont_Clicked)
mmiArial.Checked = true
mmiArial.DefaultItem = true
mmiTimesNewRoman = new MenuItem("&Times New Roman", AddressOf Me.FormatFont_Clicked)
mmiCourier = new MenuItem("&Courier New", AddressOf Me.FormatFont_Clicked)

miFormat.MenuItems.Add( "Font &Face" _
, new EventHandler(AddressOf Me.FormatFont_Clicked) _
, (new MenuItem(){ mmiArial, mmiTimesNewRoman, mmiCourier }))

'Font Size sub-menu
mmiSmall = new MenuItem("&Small", AddressOf Me.FormatSize_Clicked)
mmiMedium = new MenuItem("&Medium", AddressOf Me.FormatSize_Clicked)
mmiMedium.Checked = true
mmiMedium.DefaultItem = true
mmiLarge = new MenuItem("&Large", AddressOf Me.FormatSize_Clicked)

miFormat.MenuItems.Add( "Font &Size" _
, new EventHandler(AddressOf Me.FormatSize_Clicked) _
, (new MenuItem(){ mmiSmall, mmiMedium, mmiLarge }))

'Add Format to label context menu
'Note have to add a clone because menus can't belong to 2 parents
label1ContextMenu.MenuItems.Add(miFormat.CloneMenu)

' Set up the context menu items - we use these to check and uncheck items
cmiArial = label1ContextMenu.MenuItems(0).MenuItems(0).MenuItems(0)
cmiTimesNewRoman = label1ContextMenu.MenuItems(0).MenuItems(0).MenuItems(1)
cmiCourier = label1ContextMenu.MenuItems(0).MenuItems(0).MenuItems(2)
cmiSmall = label1ContextMenu.MenuItems(0).MenuItems(1).MenuItems(0)
cmiMedium = label1ContextMenu.MenuItems(0).MenuItems(1).MenuItems(1)
cmiLarge = label1ContextMenu.MenuItems(0).MenuItems(1).MenuItems(2)

'We use these to track which menu items are checked
'This is made more complex because we have both a menu and a context menu
miMainFormatFontChecked = mmiArial
miMainFormatSizeChecked = mmiMedium
miContextFormatFontChecked = cmiArial
miContextFormatSizeChecked = cmiMedium

End Sub

'File->Exit Menu item handler
Private Sub FileExit_Clicked(sender As object, e As System.EventArgs)
Me.Close
End Sub

'File->Open Menu item handler
Private Sub FileOpen_Clicked(sender As object, e As System.EventArgs)
MessageBox.Show("And why would this open a file?")
End Sub

'Format->Font Menu item handler
Private Sub FormatFont_Clicked(sender As object, e As System.EventArgs)

Dim miClicked As MenuItem = CType(sender, MenuItem)

miMainFormatFontChecked.Checked = false
miContextFormatFontChecked.Checked = false

fontFace = miClicked.Text.Remove(0,1) 'Strip off & from menu item text

If (fontFace = "Arial") Then
miMainFormatFontChecked = mmiArial
miContextFormatFontChecked = cmiArial
Else If (fontFace = "Times New Roman") Then
miMainFormatFontChecked = mmiTimesNewRoman
miContextFormatFontChecked = cmiTimesNewRoman
Else
miMainFormatFontChecked = mmiCourier
miContextFormatFontChecked = cmiCourier
End If

miMainFormatFontChecked.Checked = true
miContextFormatFontChecked.Checked = true

label1.Font = new Font(fontFace, fontSize)

End Sub

'Format->Size Menu item handler
Private Sub FormatSize_Clicked(sender As object, e As System.EventArgs)

Dim miClicked As MenuItem = CType(sender, MenuItem)

miMainFormatSizeChecked.Checked = false
miContextFormatSizeChecked.Checked = false

Dim fontSizeString As String = miClicked.Text

If (fontSizeString = "&Small") Then
miMainFormatSizeChecked = mmiSmall
miContextFormatSizeChecked = cmiSmall
fontSize = FontSizes.Small
Else If (fontSizeString = "&Large")
miMainFormatSizeChecked = mmiLarge
miContextFormatSizeChecked = cmiLarge
fontSize = FontSizes.Large
Else
miMainFormatSizeChecked = mmiMedium
miContextFormatSizeChecked = cmiMedium
fontSize = FontSizes.Medium
End If

miMainFormatSizeChecked.Checked = true
miContextFormatSizeChecked.Checked = true

label1.Font = new Font(fontFace, fontSize)
End Sub

'Clean up any resources being used
Overrides Public Sub Dispose()
MyBase.Dispose
components.Dispose
End Sub

Private Sub InitializeComponent()

Me.components = new System.ComponentModel.Container()
Me.label1 = new System.WinForms.Label()
Me.mainMenu = new System.WinForms.MainMenu()
Me.label1ContextMenu = new System.WinForms.ContextMenu()

Me.AutoScaleBaseSize = new System.Drawing.Size(5, 13)
Me.Text = "Menus 'R Us"
Me.Menu = mainMenu
Me.ClientSize = new System.Drawing.Size(392, 117)

label1.Anchor = System.WinForms.AnchorStyles.TopLeftRight
label1.BackColor = System.Drawing.Color.LightSteelBlue
label1.ContextMenu = label1ContextMenu
label1.Location = new System.Drawing.Point(16, 24)
label1.Text = "Right Click on me - I have a context menu!"
label1.TabIndex = 0
label1.Size = new System.Drawing.Size(360, 50)

Me.Controls.Add(label1)
End Sub

'Run the application
'The main entry point for the application
Shared Sub Main()
System.WinForms.Application.Run(New Menus())
End Sub

End Class

End Namespace

作者:jspfuns