VB打造超酷个性化菜单（六）

（接上篇）

'''' 拦截菜单消息 (frmMenu 窗口入口函数)
Function MenuWndProc(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Select Case Msg
        Case WM_COMMAND                                                 '''' 单击菜单项
            If MyItemInfo(wParam).itemType = MIT_CHECKBOX Then
                If MyItemInfo(wParam).itemState = MIS_CHECKED Then
                    MyItemInfo(wParam).itemState = MIS_UNCHECKED
                Else
                    MyItemInfo(wParam).itemState = MIS_CHECKED
                End If
            End If
            MenuItemSelected wParam
        Case WM_EXITMENULOOP                                            '''' 退出菜单消息循环(保留)
           
        Case WM_MEASUREITEM                                             '''' 处理菜单项高度和宽度
            MeasureItem hwnd, lParam
        Case WM_MENUSELECT                                              '''' 选择菜单项
            Dim itemID As Long
            itemID = GetMenuItemID(lParam, wParam And &HFF)
            If itemID <> -1 Then
                MenuItemSelecting itemID
            End If
        Case WM_DRAWITEM                                                '''' 绘制菜单项
            DrawItem lParam
    End Select
    MenuWndProc = CallWindowProc(preMenuWndProc, hwnd, Msg, wParam, lParam)
End Function

'''' 处理菜单高度和宽度
Private Sub MeasureItem(ByVal hwnd As Long, ByVal lParam As Long)
    Dim TextSize As Size, hdc As Long
    hdc = GetDC(hwnd)
    CopyMemory MeasureInfo, ByVal lParam, Len(MeasureInfo)
    If MeasureInfo.CtlType And ODT_MENU Then
        MeasureInfo.itemWidth = lstrlen(MyItemInfo(MeasureInfo.itemID).itemText) * (GetSystemMetrics(SM_CYMENU) / 2.5) + BarWidth
        If MyItemInfo(MeasureInfo.itemID).itemType <> MIT_SEPARATOR Then
            MeasureInfo.itemHeight = GetSystemMetrics(SM_CYMENU)
        Else
            MeasureInfo.itemHeight = 6
        End If
    End If
    CopyMemory ByVal lParam, MeasureInfo, Len(MeasureInfo)
    ReleaseDC hwnd, hdc
End Sub

'''' 绘制菜单项
Private Sub DrawItem(ByVal lParam As Long)
    Dim hPen As Long, hBrush As Long
    Dim itemRect As RECT, barRect As RECT, iconRect As RECT, textRect As RECT
    Dim i As Long
    CopyMemory DrawInfo, ByVal lParam, Len(DrawInfo)
    If DrawInfo.CtlType = ODT_MENU Then
        SetBkMode DrawInfo.hdc, TRANSPARENT
       
        '''' 初始化菜单项矩形, 图标矩形, 文字矩形
        itemRect = DrawInfo.rcItem
        iconRect = DrawInfo.rcItem
        textRect = DrawInfo.rcItem
       
        '''' 设置菜单附加条矩形
        With barRect
            .Left = 0
            .Top = 0
            .Right = BarWidth - 1
            For i = 0 To GetMenuItemCount(hMenu) - 1
                If MyItemInfo(i).itemType = MIT_SEPARATOR Then
                    .Bottom = .Bottom + 6
                Else
                    .Bottom = .Bottom + MeasureInfo.itemHeight
                End If
            Next i
            .Bottom = .Bottom - 1
        End With
       
        '''' 设置图标矩形, 文字矩形
        If BarStyle <> LBS_NONE Then iconRect.Left = barRect.Right + 2
        iconRect.Right = iconRect.Left + 20
        textRect.Left = iconRect.Right + 3
       
        With DrawInfo
       
            '''' 画菜单背景
            itemRect.Left = barRect.Right
            hBrush = CreateSolidBrush(BkColor)
            FillRect .hdc, itemRect, hBrush
            DeleteObject hBrush

       
            '''' 画菜单左边的附加条
            Dim RedArea As Long, GreenArea As Long, BlueArea As Long
            Dim red As Long, green As Long, blue As Long
            Select Case BarStyle
                Case LBS_NONE                                           '''' 无附加条

                Case LBS_SOLIDCOLOR                              &

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