在vb中实现真正锁定的带自定义菜单的文本控件
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vb中的textbox控件，虽然可以设置locked属性来实现对文本的锁定，但是，如果用户使用右键菜单，那么就不起作用了，仍然可以对文本进行编辑，有没有办法使用户不能对文本框进行编辑而且替换掉控件的那个右键菜单呢？
完整实现代码如下：
’核心代码的代码
'uTextBox 是你要屏蔽的文本控件 m_Menu 是你要弹出的菜单 m_Read标记是否锁定
Private Sub uTextBox_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 And m_Read = True Then
OldWindowProc = GetWindowLong(uTextBox.hWnd, GWL_WNDPROC)
' 取得窗口函数的地址
Call SetWindowLong(uTextBox.hWnd, GWL_WNDPROC, AddressOf SubClass_WndMessage)
' 用SubClass_WndMessage代替窗口函数处理消息
End If
End Sub
Private Sub uTextBox_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 And m_Read = True Then
Call SetWindowLong(uTextBox.hWnd, GWL_WNDPROC, OldWindowProc)
' 恢复窗口的默认函数
' 弹出自定义菜单
If Not m_Menu Is Nothing Then
If TypeOf m_Menu Is Menu Then
PopupMenu m_Menu
End If
End If
End If
End Sub
'以下放置在模块中
Public Declare Function CallWindowProc Lib "user32" Alias "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Public Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Function SubClass_WndMessage(ByVal hWnd As OLE_HANDLE, ByVal Msg As OLE_HANDLE, ByVal wp As OLE_HANDLE, ByVal lp As Long) As Long
If Msg <> WM_CONTEXTMENU Then
SubClass_WndMessage = CallWindowProc(OldWindowProc, hWnd, Msg, wp, lp)
' 如果消息不是WM_CONTEXTMENU，就调用默认的窗口函数处理
Exit Function
End If
SubClass_WndMessage = True
End Function
'一下是一个完整的自定义的控件的例子“
'下面放置到一个自定义控件中
VERSION 5.00
Begin VB.UserControl UTextBox
ClientHeight = 525
ClientLeft = 0
ClientTop = 0
ClientWidth = 1425
ScaleHeight = 525
ScaleWidth = 1425
Begin VB.TextBox uTextBox
Appearance = 0 'Flat
BackColor = &H80000018&
Height = 345
Left = 30
TabIndex = 0
Top = 90
Width = 1275
End
End
Attribute VB_Name = "UTextBox"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
Private m_BackColor As OLE_COLOR '颜色
Private m_MaxLength As Integer '长度
Private m_TextAlig As VBRUN.AlignmentConstants '文本位置
Private m_Menu As Menu '自定义菜单
Private m_Read As Boolean '是否可读
Private m_Enabled As Boolean 'Enabled
'Private m_MulitLine As Boolean '换行
Private Const m_DefBackColor = &H80000018 '默认文本背景颜色
Public Event Change() '文本修改事件
Public Event Click() 'click事件
Private Sub UserControl_Initialize()
Call UserControl_Resize
End Sub
Private Sub UserControl_ReadProperties(PropBag As PropertyBag)
Let BackColor = PropBag.ReadProperty("BackColor", m_DefBackColor)
Let MaxLength = PropBag.ReadProperty("MaxLength", 0)
Let Text = PropBag.ReadProperty("Text", "")
Let Alignment = PropBag.ReadProperty("Alignment", 0)
Set Menu = PropBag.ReadProperty("Menu", Nothing)
Let ReadOnly = PropBag.ReadProperty("Read", False)
Let Enabled = PropBag.ReadProperty("Enabled", True)
' Let uTextBox.MultiLine = PropBag.ReadProperty("MultiLine", False)
'Let uTextBox.ScrollBars = PropBag.ReadProperty("ScrollBars", 0)
End Sub
Private Sub UserControl_WriteProperties(PropBag As PropertyBag)
Call PropBag.WriteProperty("BackColor", BackColor, m_DefBackColor)
Call PropBag.WriteProperty("MaxLength", MaxLength, 0)
Call PropBag.WriteProperty("Text", Text, "")
Call PropBag.WriteProperty("Alignment", Alignment, 0)
Call PropBag.WriteProperty("Menu", Menu, Nothing)
Call PropBag.WriteProperty("Read", ReadOnly, False)
Call PropBag.WriteProperty("Enabled", Enabled, True)
'Call PropBag.WriteProperty("MultiLine", MultiLine, False)
'Call PropBag.WriteProperty("ScrollBars", ScrollBars, 0)
End Sub
Private Sub uTextBox_Click()
RaiseEvent Click
End Sub
Private Sub uTextBox_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 And m_Read = True Then
OldWindowProc = GetWindowLong(uTextBox.hWnd, GWL_WNDPROC)
' 取得窗口函数的地址
Call SetWindowLong(uTextBox.hWnd, GWL_WNDPROC, AddressOf SubClass_WndMessage)
' 用SubClass_WndMessage代替窗口函数处理消息
End If
End Sub
Private Sub uTextBox_MouseUp(Button As Integer, Shift As Integer, X As Single, Y As Single)
If Button = 2 And m_Read = True Then
Call SetWindowLong(uTextBox.hWnd, GWL_WNDPROC, OldWindowProc)
' 恢复窗口的默认函数
' 弹出自定义菜单
If Not m_Menu Is Nothing Then
If TypeOf m_Menu Is Menu Then
PopupMenu m_Menu
End If
End If
End If
End Sub
Private Sub UserControl_Resize()
With UserControl
uTextBox.Move .ScaleLeft, .ScaleTop, .ScaleWidth, .ScaleHeight
End With
End Sub
Public Property Let BackColor(ByVal vNewValue As OLE_COLOR)
Let m_BackColor = vNewValue
Let uTextBox.BackColor = vNewValue
Let UserControl.BackColor = vNewValue
End Property
Public Property Get BackColor() As OLE_COLOR
Let BackColor = m_BackColor
End Property
Public Property Let Text(ByVal vNewValue As String)
Let uTextBox.Text = vNewValue
End Property
Public Property Get Text() As String
Let Text = uTextBox.Text
End Property
Public Property Let Alignment(ByVal vNewValue As VBRUN.AlignmentConstants)
Let m_TextAlig = vNewValue
Let uTextBox.Alignment = vNewValue
End Property
Public Property Get Alignment() As VBRUN.AlignmentConstants
Let Alignment = m_TextAlig
End Property
Public Property Let ReadOnly(ByVal vNewValue As Boolean)
Let m_Read = vNewValue
Let uTextBox.Locked = vNewValue
End Property
Public Property Get ReadOnly() As Boolean
Let ReadOnly = m_Read
End Property
Private Sub uTextBox_Change()
RaiseEvent Change
End Sub
Public Property Set Menu(ByRef vNewValue As Menu)
Set m_Menu = vNewValue
End Property
Public Property Get Menu() As Menu
Set Menu = m_Menu
End Property
Public Property Let MaxLength(ByVal vNewValue As Integer)
Let m_MaxLength = vNewValue
Let uTextBox.MaxLength = vNewValue
End Property
Public Property Get MaxLength() As Integer
Let MaxLength = m_MaxLength
End Property
Public Property Let SelLength(ByVal vNewValue As Integer)
'Let m_SelLength = vNewValue
Let uTextBox.SelLength = vNewValue
End Property
Public Property Get SelLength() As Integer
Let SelLength = uTextBox.SelLength
End Property
Public Property Let SelStart(ByVal vNewValue As Integer)
Let uTextBox.SelStart = vNewValue
End Property
Public Property Get SelStart() As Integer
Let SelStart = uTextBox.SelStart
End Property
Public Property Let SelText(ByVal vNewValue As String)
Let uTextBox.SelText = vNewValue
End Property
Public Property Get SelText() As String
Let SelText = uTextBox.SelText
End Property
'Public Property Let MulitLine(ByVal vNewValue As Boolean)
' Let uTextBox.MultiLine = vNewValue
'End Property
'Public Property Get MultiLine() As Boolean
' Let MulitLine = uTextBox.MulitLine
'End Property
'Public Property Let ScrollBars(ByVal vNewValue As VBRUN.ScrollBarConstants)
' Let uTextBox.ScrollBars = vNewValue
'End Property
'Public Property Get ScrollBars() As VBRUN.ScrollBarConstants
' Let ScrollBars = uTextBox.ScrollBars
'End Property
Public Property Let Enabled(ByVal vNewValue As Boolean)
Let m_Enabled = vNewValue
Let uTextBox.Enabled = vNewValue
Let UserControl.Enabled = vNewValue
End Property
Public Property Get Enabled() As Boolean
Let Enabled = m_Enabled
End Property
'将前面模块中的代码保留
'新建一个窗体，看现在这个自定义的真正锁定的文本控件如何？
