Standard VB combo box does not allow standard means to draw on the list. To work around this limitation, in its module I use OWNERDRAW style combo box. After small completion, you can do anything with the list.
![]()
Code:
Option Explicit
' Модуль для создания комбинированного списка с выбором цветов
' © Кривоус Анатолий Анатольевич (The trick), 2014
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private 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
Private Type MEASUREITEMSTRUCT
CtlType As Long
CtlID As Long
itemID As Long
itemWidth As Long
itemHeight As Long
itemData As Long
End Type
Private 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
Private Declare Function CallNextHookEx Lib "user32" (ByVal hHook As Long, ByVal nCode As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function UnhookWindowsHookEx Lib "user32" (ByVal hHook As Long) As Long
Private Declare Function SetProp Lib "user32" Alias "SetPropA" (ByVal hwnd As Long, ByVal lpString As String, ByVal hData As Long) As Long
Private Declare Function GetProp Lib "user32" Alias "GetPropA" (ByVal hwnd As Long, ByVal lpString As String) As Long
Private Declare Function RemoveProp Lib "user32" Alias "RemovePropA" (ByVal hwnd As Long, ByVal lpString As String) As Long
Private 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
Private Declare Function GetStockObject Lib "gdi32" (ByVal nIndex As Long) As Long
Private Declare Function SetDCBrushColor Lib "gdi32" (ByVal hdc As Long, ByVal colorref As Long) As Long
Private Declare Function SetDCPenColor Lib "gdi32" (ByVal hdc As Long, ByVal colorref As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function Rectangle Lib "gdi32" (ByVal hdc As Long, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function GetClassName Lib "user32" Alias "GetClassNameA" (ByVal hwnd As Long, ByVal lpClassName As String, ByVal nMaxCount As Long) As Long
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Private Declare Function GetClientRect Lib "user32" (ByVal hwnd As Long, lpRect As RECT) As Long
Private Declare Function GetSysColor Lib "user32" (ByVal nIndex As Long) As Long
Private Declare Function DrawText Lib "user32" Alias "DrawTextA" (ByVal hdc As Long, lpStr As Any, ByVal nCount As Long, lpRect As RECT, ByVal wFormat As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Private Declare Function SetBkMode Lib "gdi32" (ByVal hdc As Long, ByVal nBkMode As Long) As Long
Private Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Private Const TRANSPARENT As Long = 1
Private Const COLOR_WINDOW As Long = 5
Private Const COLOR_WINDOWTEXT As Long = 8
Private Const COLOR_HIGHLIGHT As Long = 13
Private Const COLOR_HIGHLIGHTTEXT As Long = 14
Private Const ODS_SELECTED As Long = &H1
Private Const DC_PEN As Long = 19
Private Const DC_BRUSH As Long = 18
Private Const WH_CBT As Long = 5
Private Const HCBT_CREATEWND As Long = 3
Private Const GWL_WNDPROC = &HFFFFFFFC
Private Const ODT_COMBOBOX As Long = 3
Private Const CBS_OWNERDRAWFIXED As Long = &H10&
Private Const CBS_DROPDOWNLIST As Long = &H3&
Private Const CBS_HASSTRINGS As Long = &H200&
Private Const WM_MEASUREITEM As Long = &H2C
Private Const WM_DRAWITEM = &H2B
Private Const GWL_STYLE As Long = &HFFFFFFF0
Private Const WM_DESTROY As Long = &H2
Private Const DT_SINGLELINE As Long = &H20, DT_VCENTER As Long = &H4
Private Const CB_GETLBTEXT As Long = &H148
Private Const CB_GETLBTEXTLEN As Long = &H149
Dim hHook As Long
Public Function CreateOwnerdrawCombo(Form As Form, Name As String, Optional Container As Control) As ComboBox
Dim Prev As Long
hHook = SetWindowsHookEx(WH_CBT, AddressOf CBTProc, 0, App.ThreadID)
If Container Is Nothing Then
Set CreateOwnerdrawCombo = Form.Controls.Add("VB.ComboBox", Name)
Else: Set CreateOwnerdrawCombo = Form.Controls.Add("VB.ComboBox", Name, Container)
End If
UnhookWindowsHookEx hHook
If Not CreateOwnerdrawCombo Is Nothing Then
Prev = GetProp(CreateOwnerdrawCombo.Container.hwnd, "prev")
If Prev = 0 Then
Prev = SetWindowLong(CreateOwnerdrawCombo.Container.hwnd, GWL_WNDPROC, AddressOf WndProc)
SetProp CreateOwnerdrawCombo.Container.hwnd, "prev", Prev
End If
End If
End Function
Private Function CBTProc(ByVal uCode As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
If uCode = HCBT_CREATEWND Then
Dim Class As String, l As Long, Style As Long
Class = Space(256)
l = GetClassName(wParam, Class, 255)
If l Then
Class = Left(Class, l)
If StrComp(Class, "ThunderComboBox", vbTextCompare) = 0 Or _
StrComp(Class, "ThunderRT6ComboBox", vbTextCompare) = 0 Then
Style = GetWindowLong(wParam, GWL_STYLE)
SetWindowLong wParam, GWL_STYLE, Style Or CBS_OWNERDRAWFIXED Or CBS_DROPDOWNLIST Or CBS_HASSTRINGS
End If
End If
End If
CBTProc = CallNextHookEx(hHook, uCode, wParam, ByVal lParam)
End Function
Private Function WndProc(ByVal hwnd As Long, ByVal uMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim Prev As Long
Select Case uMsg
Case WM_DESTROY
Prev = GetProp(hwnd, "prev")
SetWindowLong hwnd, GWL_WNDPROC, Prev
RemoveProp hwnd, "prev"
WndProc = CallWindowProc(Prev, hwnd, uMsg, wParam, lParam)
Case WM_DRAWITEM
Dim drw As DRAWITEMSTRUCT
CopyMemory drw, ByVal lParam, Len(drw)
If drw.CtlType = ODT_COMBOBOX Then
DrawItem drw
WndProc = True
Else
Prev = GetProp(hwnd, "prev")
WndProc = CallWindowProc(Prev, hwnd, uMsg, wParam, lParam)
End If
Case WM_MEASUREITEM
Dim meas As MEASUREITEMSTRUCT, RC As RECT
CopyMemory meas, ByVal lParam, Len(meas)
If meas.CtlType = ODT_COMBOBOX Then
GetClientRect hwnd, RC
meas.itemWidth = RC.Right - RC.Left
CopyMemory ByVal lParam, meas, Len(meas)
WndProc = True
Else
Prev = GetProp(hwnd, "prev")
WndProc = CallWindowProc(Prev, hwnd, uMsg, wParam, lParam)
End If
Case Else
Prev = GetProp(hwnd, "prev")
WndProc = CallWindowProc(Prev, hwnd, uMsg, wParam, lParam)
End Select
End Function
Private Function DrawItem(drw As DRAWITEMSTRUCT) As Boolean
Dim obr As Long, opn As Long, l As Long, s As String
obr = SelectObject(drw.hdc, GetStockObject(DC_BRUSH))
opn = SelectObject(drw.hdc, GetStockObject(DC_PEN))
If (drw.itemState And ODS_SELECTED) Then
SetDCBrushColor drw.hdc, GetSysColor(COLOR_HIGHLIGHT)
SetDCPenColor drw.hdc, GetSysColor(COLOR_HIGHLIGHT)
Rectangle drw.hdc, drw.rcItem.Left, drw.rcItem.Top, drw.rcItem.Right, drw.rcItem.Bottom
SetDCPenColor drw.hdc, GetSysColor(COLOR_HIGHLIGHTTEXT)
SetTextColor drw.hdc, GetSysColor(COLOR_HIGHLIGHTTEXT)
Else
SetDCBrushColor drw.hdc, GetSysColor(COLOR_WINDOW)
SetDCPenColor drw.hdc, GetSysColor(COLOR_WINDOW)
Rectangle drw.hdc, drw.rcItem.Left, drw.rcItem.Top, drw.rcItem.Right, drw.rcItem.Bottom
SetDCPenColor drw.hdc, GetSysColor(COLOR_WINDOWTEXT)
SetTextColor drw.hdc, GetSysColor(COLOR_WINDOWTEXT)
End If
SetBkMode drw.hdc, TRANSPARENT
If drw.itemID >= 0 Then
SetDCBrushColor drw.hdc, drw.itemData
Rectangle drw.hdc, drw.rcItem.Left + 3, drw.rcItem.Top + 3, drw.rcItem.Left + 70, drw.rcItem.Bottom - 3
l = SendMessage(drw.hwndItem, CB_GETLBTEXTLEN, drw.itemID, ByVal 0)
If l Then
s = Space(l + 1)
l = SendMessage(drw.hwndItem, CB_GETLBTEXT, drw.itemID, ByVal s)
s = Left(s, l)
drw.rcItem.Left = drw.rcItem.Left + 78
End If
Else
drw.rcItem.Left = drw.rcItem.Left + 2
s = "None"
End If
DrawText drw.hdc, ByVal s, Len(s), drw.rcItem, DT_VCENTER Or DT_SINGLELINE
SelectObject drw.hdc, obr
SelectObject drw.hdc, opn
End Function