Colour Combo Box using WM_DRAWITEM (One for the Guru's)

I've changed Aaron Young's the code that shows you how to display items in a combo box drop in different colours. It now draws a rectangle in the relevant colour next colour name text.
That was the easy bit. The bit I can't figure out is how to draw the rectangle and display the text in the text box part of the combo box.

Examples please.

Thanks in advance

Code:

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' ***********
' Module1.bas
' ***********
Option Explicit

Public Type RECT
  Left As Long
  Top As Long
  Right As Long
  Bottom As Long
End Type
Public Type DRAWITEMSTRUCT
  CtlType As Long
  CtlID As Long
  itemID As Long
  itemAction As Long
  itemState As Long
  hwndItem As Long
  hdc As Long
  rcItem As RECT
  ItemData As Long
End Type
Public Type CWPSTRUCT
  lParam As Long
  wParam As Long
  message As Long
  hwnd As Long
End Type
Public Type CREATESTRUCT
  lpCreateParams As Long
  hInstance As Long
  hMenu As Long
  hWndParent As Long
  cy As Long
  cx As Long
  y As Long
  x As Long
  style As Long
  'These next 2 are Normaly String, but need to be a fixed length
  'so we know how long they are when using CopyMemory,
  'We're only interested in the Style Property anyway.
  lpszName As Long
  lpszClass As Long
  ExStyle As Long
End Type

Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length 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 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 SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function SetBkColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function TextOut Lib "gdi32" Alias "TextOutA" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal lpString As String, ByVal nCount As Long) As Long
Public Declare Function GetSysColor Lib "user32" (ByVal nIndex As Long) As Long
Public Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Public Declare Function SetWindowsHookEx Lib "user32" Alias "SetWindowsHookExA" (ByVal idHook As Long, ByVal lpfn As Long, ByVal hmod As Long, ByVal dwThreadId As Long) As Long
Public Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
Public Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal ncode As Long, ByVal wParam As Long, lParam As Any) As Long
Public Declare Function CreateSolidBrush Lib "gdi32" (ByVal crColor As Long) As Long
Public Declare Function FillRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Public Declare Function DrawFocusRect Lib "user32" (ByVal hdc As Long, lpRect As RECT) As Long

Public Const WH_CALLWNDPROC = 4

Public Const CBS_OWNERDRAWVARIABLE = &H20&
Public Const CB_GETLBTEXT = &H148
Public Const CB_SETITEMHEIGHT = &H153

Public Const COLOR_HIGHLIGHT = 13
Public Const COLOR_HIGHLIGHTTEXT = 14
Public Const COLOR_WINDOW = 5
Public Const COLOR_WINDOWTEXT = 8

Public Const GWL_WNDPROC = (-4)
Public Const GWL_STYLE = (-16)

Public Const ODS_FOCUS = &H10
Public Const ODS_SELECTED = &H1

Public Const ODT_COMBOBOX = 3

Public Const WM_CREATE = &H1
Public Const WM_DRAWITEM = &H2B

Public lPrevWndProc As Long
Public lHook As Long
Public lSubCombo As Long

Public Function SubClassedForm(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    Dim tItem As DRAWITEMSTRUCT
    Dim sItem As String
    Dim lBack As Long
    Dim rc As RECT
   
    If Msg = WM_DRAWITEM Then
        'This function only passes the Address of the DrawItem Structure, so we need to
        'use the CopyMemory API to Get a Copy into the Variable we setup:
        Call CopyMemory(tItem, ByVal lParam, Len(tItem))
        'If it's our Combobox..
        If tItem.CtlType = ODT_COMBOBOX Then
            'Get the Item Text
            sItem = Space(255)
            Call SendMessage(tItem.hwndItem, CB_GETLBTEXT, tItem.itemID, ByVal sItem)
            sItem = Left(sItem, InStr(sItem, Chr(0)) - 1)
            rc = tItem.rcItem
            'Select the Highlight Colors if this Item is currently selected
            If (tItem.itemState And ODS_SELECTED) Then
                lBack = CreateSolidBrush(GetSysColor(COLOR_HIGHLIGHT))
                Call FillRect(tItem.hdc, tItem.rcItem, lBack)
                Call SetBkColor(tItem.hdc, GetSysColor(COLOR_HIGHLIGHT))
                Call SetTextColor(tItem.hdc, GetSysColor(COLOR_HIGHLIGHTTEXT))
            Else
                'Otherwise, use the default Colors, unless the Item Data contains a new Color
                lBack = CreateSolidBrush(GetSysColor(COLOR_WINDOW))
                Call FillRect(tItem.hdc, tItem.rcItem, lBack)
                Call SetBkColor(tItem.hdc, GetSysColor(COLOR_WINDOW))
                Call SetTextColor(tItem.hdc, GetSysColor(COLOR_WINDOWTEXT))
            End If
            Call DeleteObject(lBack)
            'Display the Item
            lBack = CreateSolidBrush(tItem.ItemData)
            rc.Top = rc.Top + 1
            rc.Bottom = rc.Bottom - 1
            rc.Left = 1
            rc.Right = rc.Left + (rc.Bottom - rc.Top)
           
            Call FillRect(tItem.hdc, rc, lBack)
            TextOut tItem.hdc, rc.Right + 5, tItem.rcItem.Top + 1, ByVal sItem, Len(sItem)
            Call DeleteObject(lBack)
           
            If (tItem.itemState And ODS_FOCUS) Then
                DrawFocusRect tItem.hdc, tItem.rcItem
            End If
                       
            'Don't Return a Value as we've dealt with this Message ourselves
            SubClassedForm = 0
            Exit Function
           
        End If
    End If
    'Not our Combobox, so just process the Message as Normal
    SubClassedForm = CallWindowProc(lPrevWndProc, hwnd, Msg, wParam, lParam)
End Function

Sub Main()
    'The Combobox is a little more tricky to manipulate than a Listbox
    'So we need to do a little extra work to make it an "Owner Drawn" Control.
    lHook = SetWindowsHookEx(WH_CALLWNDPROC, AddressOf HookApp, App.hInstance, App.ThreadID)
    Form1.Show
    'Once the Control. etc are Drawn, we can release the Hook
    Call UnhookWindowsHookEx(lHook)
End Sub

Private Function HookApp(ByVal lHookID As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

    'This Function will get called when Initializing the Form
    'We want to Interupt it when it tries to create our Combobox..
    Dim tCWP As CWPSTRUCT
    Dim sClass As String

    Call CopyMemory(tCWP, ByVal lParam, Len(tCWP))

    If tCWP.message = WM_CREATE Then
        'Get the Control Classname
        sClass = Space(128)
        Call GetClassName(tCWP.hwnd, ByVal sClass, 128)
        sClass = Left(sClass, InStr(sClass, Chr(0)) - 1)
        'If it's our Combobox, Sub-class it to Modify the Create Message..
        If sClass = "ComboLBox" Then
            lSubCombo = SetWindowLong(tCWP.hwnd, GWL_WNDPROC, AddressOf SubComboCreate)
        End If
    End If
    'Continue the Hook Processing
    HookApp = CallNextHookEx(lHook, lHookID, wParam, ByVal lParam)

End Function

Private Function SubComboCreate(ByVal hwnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    'This Function will be called when the Combobox is about to be created
    Dim tCreate As CREATESTRUCT
   
    If Msg = WM_CREATE Then
        'Grab the Data that's going to be used to Create the Combobox
        Call CopyMemory(tCreate, ByVal lParam, Len(tCreate))
        'Alter it, to make the Combobox an "Owner Drawn" Control
        tCreate.style = tCreate.style Or CBS_OWNERDRAWVARIABLE
        'Copy the modified data back
        Call CopyMemory(ByVal lParam, tCreate, Len(tCreate))
        'Alter the Style to OwnerDrawn
        Call SetWindowLong(hwnd, GWL_STYLE, tCreate.style)
        'Release this Subclassing Function
        Call SetWindowLong(hwnd, GWL_WNDPROC, lSubCombo)
    End If
    'Let Windows Process the Modified Data
    SubComboCreate = CallWindowProc(lSubCombo, hwnd, Msg, wParam, lParam)
   
End Function


' ***********
' Form1.frm

' You'll to add a combo box called Combo1
' ***********

Option Explicit

Private Sub Form_Load()
    Dim iColor As Integer

    Combo1.AddItem "Black"
    Combo1.AddItem "Navy"
    Combo1.AddItem "Green"
    Combo1.AddItem "Teal"
    Combo1.AddItem "Maroon"
    Combo1.AddItem "Burgandy"
    Combo1.AddItem "Olive"
    Combo1.AddItem "Silver"
    Combo1.AddItem "Grey"
    Combo1.AddItem "Blue"
    Combo1.AddItem "Green"
    Combo1.AddItem "Cyan"
    Combo1.AddItem "Red"
    Combo1.AddItem "Purple"
    Combo1.AddItem "Yellow"
    Combo1.AddItem "White"
    For iColor = 0 To 15
        Combo1.ItemData(iColor) = QBColor(iColor)
    Next
    Combo1.ListIndex = 0
    lPrevWndProc = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf SubClassedForm)
End Sub

Private Sub Form_Unload(Cancel As Integer)
    Call SetWindowLong(hwnd, GWL_WNDPROC, lPrevWndProc)
End Sub

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