Option Explicit
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 CWPSTRUCT
lParam As Long
wParam As Long
message As Long
hWnd As Long
End Type
Private 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
lpszName As Long
lpszClass As Long
ExStyle As Long
End Type
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length 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 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 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 SetBkColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Private Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Private 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
Private Declare Function GetSysColor Lib "user32" (ByVal nIndex 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 FillRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
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 UnhookWindowsHookEx Lib "user32" (ByVal hHook 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 CreateSolidBrush Lib "gdi32" (ByVal crColor As Long) As Long
Private Const WH_CALLWNDPROC = 4
Private Const CBS_OWNERDRAWVARIABLE = &H20&
Private Const CB_GETLBTEXT = &H148
Private Const COLOR_HIGHLIGHT = 13
Private Const COLOR_HIGHLIGHTTEXT = 14
Private Const COLOR_WINDOW = 5
Private Const COLOR_WINDOWTEXT = 8
Private Const GWL_WNDPROC = (-4)
Private Const GWL_STYLE = (-16)
Private Const ODS_SELECTED = &H1
Private Const ODT_COMBOBOX = 3
Private Const WM_CREATE = &H1
Private Const WM_DRAWITEM = &H2B
Private lPrevWndProc As Long
Private lHook As Long
Private lSubCombo As Long
Sub Main()
lHook = SetWindowsHookEx(WH_CALLWNDPROC, AddressOf HookApp, App.hInstance, App.ThreadID)
Form1.Show
Call UnhookWindowsHookEx(lHook)
End Sub
Public Sub SubClassForm(ByVal hWnd As Long)
lPrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubClassedForm)
End Sub
Public Sub RemoveSubClassing(ByVal hWnd As Long)
Call SetWindowLong(hWnd, GWL_WNDPROC, lPrevWndProc)
End Sub
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 lBackBrush As Long
If Msg = WM_DRAWITEM Then
Call CopyMemory(tItem, ByVal lParam, Len(tItem))
If tItem.CtlType = ODT_COMBOBOX Then
sItem = Space(255)
Call SendMessage(tItem.hwndItem, CB_GETLBTEXT, tItem.itemID, ByVal sItem)
sItem = Left(sItem, InStr(sItem, Chr(0)) - 1)
If (tItem.itemState And ODS_SELECTED) Then
lBackBrush = CreateSolidBrush(GetSysColor(COLOR_HIGHLIGHT))
Call SetBkColor(tItem.hdc, GetSysColor(COLOR_HIGHLIGHT))
Call SetTextColor(tItem.hdc, GetSysColor(COLOR_HIGHLIGHTTEXT))
Else
lBackBrush = CreateSolidBrush(GetSysColor(COLOR_WINDOW))
Call SetBkColor(tItem.hdc, GetSysColor(COLOR_WINDOW))
Call SetTextColor(tItem.hdc, tItem.itemData)
End If
FillRect tItem.hdc, tItem.rcItem, lBackBrush
TextOut tItem.hdc, tItem.rcItem.Left, tItem.rcItem.Top, ByVal sItem, Len(sItem)
SubClassedForm = 0
Exit Function
End If
End If
SubClassedForm = CallWindowProc(lPrevWndProc, hWnd, Msg, wParam, lParam)
End Function
Private Function HookApp(ByVal lHookID As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Dim tCWP As CWPSTRUCT
Dim sClass As String
Call CopyMemory(tCWP, ByVal lParam, Len(tCWP))
If tCWP.message = WM_CREATE Then
sClass = Space(128)
Call GetClassName(tCWP.hWnd, ByVal sClass, 128)
sClass = Left(sClass, InStr(sClass, Chr(0)) - 1)
If sClass = "ComboLBox" Then
lSubCombo = SetWindowLong(tCWP.hWnd, GWL_WNDPROC, AddressOf SubComboCreate)
End If
End If
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
Dim tCreate As CREATESTRUCT
If Msg = WM_CREATE Then
Call CopyMemory(tCreate, ByVal lParam, Len(tCreate))
tCreate.style = tCreate.style Or CBS_OWNERDRAWVARIABLE
Call CopyMemory(ByVal lParam, tCreate, Len(tCreate))
Call SetWindowLong(hWnd, GWL_STYLE, tCreate.style)
Call SetWindowLong(hWnd, GWL_WNDPROC, lSubCombo)
End If
SubComboCreate = CallWindowProc(lSubCombo, hWnd, Msg, wParam, lParam)
End Function