以下代码在窗体中: Option ExplicitPrivate Sub Form_Load() Dim iIndex As Integer For iIndex = 0 To 15 Combo1.AddItem "Color " & iIndex Combo1.itemData(Combo1.NewIndex) = QBColor(iIndex) Next Combo1.ListIndex = 0'Subclass the "Form", to Capture the Combobox Notification Messages SubClassForm hWnd End SubPrivate Sub Form_Unload(Cancel As Integer) 'Release the SubClassing, Very Import to Prevent Crashing! RemoveSubClassing hWnd End Sub 以下代码在模块中: Option ExplicitPrivate Type RECT Left As Long Top As Long Right As Long Bottom As Long End TypePrivate 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 TypePrivate Type CWPSTRUCT lParam As Long wParam As Long message As Long hWnd As Long End TypePrivate 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 TypePrivate 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 GetBkColor Lib "gdi32" (ByVal hdc 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 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 LongPrivate Const WH_CALLWNDPROC = 4Private Const CBS_OWNERDRAWVARIABLE = &H20& Private Const CB_GETLBTEXT = &H148 Private Const CB_SETITEMHEIGHT = &H153Private Const COLOR_HIGHLIGHT = 13 Private Const COLOR_HIGHLIGHTTEXT = 14 Private Const COLOR_WINDOW = 5 Private Const COLOR_WINDOWTEXT = 8Private Const GWL_WNDPROC = (-4) Private Const GWL_STYLE = (-16)Private Const ODS_SELECTED = &H1Private Const ODT_COMBOBOX = 3Private Const WM_CREATE = &H1 Private Const WM_DRAWITEM = &H2BPrivate lPrevWndProc As Long Private lHook As Long Private lSubCombo As LongSub 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 SubPublic Sub SubClassForm(ByVal hWnd As Long) lPrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubClassedForm) End SubPublic Sub RemoveSubClassing(ByVal hWnd As Long) Call SetWindowLong(hWnd, GWL_WNDPROC, lPrevWndProc) End SubPublic 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'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)'Select the Highlight Colors if this Item is currently selected 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 'Otherwise, use the default Colors 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'Display the Item TextOut tItem.hdc, tItem.rcItem.Left, tItem.rcItem.Top, ByVal sItem, Len(sItem)'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 FunctionPrivate 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 FunctionPrivate 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 窗体上要有一个ComboBox。 是不是要这样的?
不知道你具体要什么样的效果。不过可以提些建议,比如对Combobox的某些设置,实际上是对它包含的Edit的设置。
我不是要设置style属性
而是要截获drawitem的消息
以下代码在窗体中:
Option ExplicitPrivate Sub Form_Load()
Dim iIndex As Integer For iIndex = 0 To 15
Combo1.AddItem "Color " & iIndex
Combo1.itemData(Combo1.NewIndex) = QBColor(iIndex)
Next
Combo1.ListIndex = 0'Subclass the "Form", to Capture the Combobox Notification Messages
SubClassForm hWnd
End SubPrivate Sub Form_Unload(Cancel As Integer)
'Release the SubClassing, Very Import to Prevent Crashing!
RemoveSubClassing hWnd
End Sub 以下代码在模块中:
Option ExplicitPrivate Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End TypePrivate 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 TypePrivate Type CWPSTRUCT
lParam As Long
wParam As Long
message As Long
hWnd As Long
End TypePrivate 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 TypePrivate 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 GetBkColor Lib "gdi32" (ByVal hdc 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 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 LongPrivate Const WH_CALLWNDPROC = 4Private Const CBS_OWNERDRAWVARIABLE = &H20&
Private Const CB_GETLBTEXT = &H148
Private Const CB_SETITEMHEIGHT = &H153Private Const COLOR_HIGHLIGHT = 13
Private Const COLOR_HIGHLIGHTTEXT = 14
Private Const COLOR_WINDOW = 5
Private Const COLOR_WINDOWTEXT = 8Private Const GWL_WNDPROC = (-4)
Private Const GWL_STYLE = (-16)Private Const ODS_SELECTED = &H1Private Const ODT_COMBOBOX = 3Private Const WM_CREATE = &H1
Private Const WM_DRAWITEM = &H2BPrivate lPrevWndProc As Long
Private lHook As Long
Private lSubCombo As LongSub 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 SubPublic Sub SubClassForm(ByVal hWnd As Long)
lPrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubClassedForm)
End SubPublic Sub RemoveSubClassing(ByVal hWnd As Long)
Call SetWindowLong(hWnd, GWL_WNDPROC, lPrevWndProc)
End SubPublic 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'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)'Select the Highlight Colors if this Item is currently selected
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
'Otherwise, use the default Colors
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'Display the Item
TextOut tItem.hdc, tItem.rcItem.Left, tItem.rcItem.Top, ByVal sItem, Len(sItem)'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 FunctionPrivate 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 FunctionPrivate 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 窗体上要有一个ComboBox。 是不是要这样的?
这个例子Cool吧?