combobox.c

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                pData->ListBoxRect.right = rect.right;
                pData->ListBoxRect.top = rect.top - list_height;
                pData->ListBoxRect.bottom = rect.top;
            }

            pData->EditControl = CreateWindow (CTRL_SLEDIT, 
                            edit_text, 
                            edit_style, IDC_CEDIT,
                            edit_box.left, edit_box.top, 
                            RECTW(edit_box), RECTH(edit_box),
                            hwnd, 0);

            if ((dwStyle & CBS_TYPEMASK) == CBS_AUTOSPIN) {
                WNDPROC old_edit_proc = SetWindowCallbackProc (pData->EditControl, AutoSpinEditBoxProc);
                SetWindowAdditionalData (pData->EditControl, (DWORD)old_edit_proc);

                pData->str_format = strdup ("%d");
            }

            if (list_height >= 0) {
                pData->ListBoxControl = CreateWindowEx (CTRL_LISTBOX,
                            "listbox", 
                            list_style, 
                            ((dwStyle & CBS_TYPEMASK) != CBS_SIMPLE) ? WS_EX_CTRLASMAINWIN : WS_EX_NONE,
                            IDC_CLISTBOX,
                            pData->ListBoxRect.left, pData->ListBoxRect.top,
                            width, list_height, 
                            hwnd, 0);
            }
            else {
                pData->ListBoxControl = 0;
            }

            break;
        }

        case MSG_DESTROY:
            DestroyAllControls (hwnd);
            free (pData->str_format);
            free (pData);
        return 0;

        case MSG_SIZECHANGING:
        {
            const RECT* rcExpect = (const RECT*)wParam;
            RECT* rcResult = (RECT*)lParam;
            if ((dwStyle & CBS_TYPEMASK) == CBS_SIMPLE) {
                int height = GetSysFontHeight (SYSLOGFONT_CONTROL)
                        + MARGIN_EDIT_TOP + MARGIN_EDIT_BOTTOM + (WIDTH_EDIT_BORDER<<1);

                rcResult->left = rcExpect->left;
                rcResult->top = rcExpect->top;
                rcResult->right = rcExpect->right;
                rcResult->bottom = rcExpect->top + height;
                rcResult->bottom += 
                        (pData->ListBoxRect.bottom - pData->ListBoxRect.top + INTER_EDIT_LISTBOX*2);
                return 0;
            }
            break;
        }

        case MSG_CHILDHIDDEN: 
        { 
            int reason = wParam; 
            int x = LOSWORD(lParam); 
            int y = HISWORD(lParam); 

            if (reason == RCTM_CLICK)
                ScreenToClient (hwnd, &x, &y); 

            if (IS_SET (pData, CSF_HASDROPPED)) 
                CLEAR_STATE (pData, CSF_HASDROPPED); 
            if (((dwStyle & CBS_TYPEMASK) > CBS_AUTOSPIN) && PtInRect (&pData->IncSpinBox, x, y))
                SET_STATE (pData, CSF_HASDROPPED); 
            break; 
        } 

        case MSG_SETFOCUS:
            if (dwStyle & CBS_AUTOFOCUS)
                SetFocusChild (pData->EditControl);
            if (dwStyle & CBS_NOTIFY)
                NotifyParent (hwnd, pCtrl->id, CBN_SETFOCUS);
            break;

        case MSG_KILLFOCUS:
            if (((dwStyle & CBS_TYPEMASK) == CBS_DROPDOWNLIST) && 
                    IS_SET (pData, CSF_HASDROPPED)) { 
                ShowWindow (pData->ListBoxControl, SW_HIDE); 
                CLEAR_STATE (pData, CSF_HASDROPPED); 
                if (dwStyle & CBS_NOTIFY)
                    NotifyParent (hwnd, pCtrl->id, CBN_CLOSEUP);
            } 
            if (dwStyle & CBS_NOTIFY)
                NotifyParent (hwnd, pCtrl->id, CBN_KILLFOCUS);
            break;

        case MSG_LBUTTONDOWN: 
        { 
            int x = LOSWORD(lParam); 
            int y = HISWORD(lParam); 
            BOOL inc = FALSE;

            if (PtInRect (&pData->IncSpinBox, x, y))
                inc = TRUE;
            else if (PtInRect (&pData->DecSpinBox, x, y))
                inc = FALSE;
            else
                break;

            switch (dwStyle & CBS_TYPEMASK) { 
                case CBS_SPINLIST:
                case CBS_AUTOSPIN:
                    SetCapture (hwnd);
                    SendMessage (hwnd, CB_SPIN, inc, 0);
                    SetAutoRepeatMessage (hwnd, CB_FASTSPIN, inc, 0);
                    break;

                case CBS_DROPDOWNLIST:
                    if (IS_SET (pData, CSF_HASDROPPED)) { 
                        ShowWindow (pData->ListBoxControl, SW_HIDE);
                        CLEAR_STATE (pData, CSF_HASDROPPED); 
                        if (dwStyle & CBS_NOTIFY)
                            NotifyParent (hwnd, pCtrl->id, CBN_CLOSEUP);
                    } 
                    else { 
                        ShowWindow (pData->ListBoxControl, SW_SHOW);
                        SET_STATE (pData, CSF_HASDROPPED); 
                        if (dwStyle & CBS_NOTIFY)
                            NotifyParent (hwnd, pCtrl->id, CBN_DROPDOWN);
                    } 
                    break;
            } 

            break; 
        } 

        case MSG_LBUTTONUP: 
        {        
            switch (dwStyle & CBS_TYPEMASK) { 
            case CBS_SPINLIST:
            case CBS_AUTOSPIN:
                SetAutoRepeatMessage (HWND_DESKTOP, 0, 0, 0);
                ReleaseCapture ();
                break;
            }
        }

        case MSG_KEYDOWN:
        {
            switch (dwStyle & CBS_TYPEMASK) {
            case CBS_SPINLIST:
            case CBS_AUTOSPIN:
                switch (LOWORD(wParam)) {
                case SCANCODE_CURSORBLOCKUP:
                case SCANCODE_CURSORBLOCKDOWN:
                    SendMessage (hwnd, CB_SPIN, (LOWORD(wParam) == SCANCODE_CURSORBLOCKDOWN), 0);
                    break;

                case SCANCODE_PAGEUP:
                case SCANCODE_PAGEDOWN:
                    SendMessage (hwnd, CB_FASTSPIN, (LOWORD(wParam) == SCANCODE_PAGEDOWN), 0);
                    break;
                }
                break;

            case CBS_DROPDOWNLIST:
                switch (LOWORD(wParam)) {
                case SCANCODE_ESCAPE:
                    if (IS_SET (pData, CSF_HASDROPPED)) {
                        ShowWindow (pData->ListBoxControl, SW_HIDE);
                        CLEAR_STATE (pData, CSF_HASDROPPED);
                        if (dwStyle & CBS_NOTIFY) {
                            NotifyParent (hwnd, pCtrl->id, CBN_SELENDCANCEL);
                            NotifyParent (hwnd, pCtrl->id, CBN_CLOSEUP);
                        }
                        SetFocusChild (pData->EditControl);
                    }
                    break;

                case SCANCODE_ENTER:
                    if (IS_SET (pData, CSF_HASDROPPED)) {
                        ShowWindow (pData->ListBoxControl, SW_HIDE);
                        CLEAR_STATE (pData, CSF_HASDROPPED);
                        if (dwStyle & CBS_NOTIFY) {
                            NotifyParent (hwnd, pCtrl->id, CBN_SELENDOK);
                            NotifyParent (hwnd, pCtrl->id, CBN_CLOSEUP);
                        }
                        SetFocusChild (pData->EditControl);
                    }
                    break;

                case SCANCODE_CURSORBLOCKUP:
                case SCANCODE_PAGEUP:
                case SCANCODE_CURSORBLOCKDOWN:
                case SCANCODE_PAGEDOWN:
                    if (!IS_SET (pData, CSF_HASDROPPED)) {
                        ShowWindow (pData->ListBoxControl, SW_SHOW);
                        SetFocusChild (pData->ListBoxControl);
                        SET_STATE (pData, CSF_HASDROPPED);
                        if (dwStyle & CBS_NOTIFY)
                            NotifyParent (hwnd, pCtrl->id, CBN_DROPDOWN);
                    }
                    break;
                }
                break;
            }
        }

        case MSG_COMMAND:
        {
            int len;
            char *buffer;
            int sel;
            int id = LOWORD(wParam);
            int code = HIWORD(wParam);

            switch (id) {
            case IDC_CLISTBOX:
            {
                if ((dwStyle & CBS_TYPEMASK) == CBS_DROPDOWNLIST && 
                                (code == LBN_CLICKED || code == LBN_KILLFOCUS)) {
                    ShowWindow (pData->ListBoxControl, SW_HIDE);
                    CLEAR_STATE (pData, CSF_HASDROPPED);
                    if (dwStyle & CBS_NOTIFY)
                        NotifyParent (hwnd, pCtrl->id, CBN_CLOSEUP);
                    break;
                }

                if (code == LBN_DBLCLK && (dwStyle & CBS_NOTIFY)) {
                    NotifyParent (hwnd, pCtrl->id, CBN_DBLCLK);
                    break;
                }

                if (code != LBN_SELCHANGE)
                    break;

                if ((sel = SendMessage (pData->ListBoxControl, LB_GETCURSEL, 0, 0)) >= 0) {
                    len = SendMessage (pData->ListBoxControl, LB_GETTEXTLEN, sel, 0);
                    buffer = ALLOCATE_LOCAL (len + 1);
                    //buffer = FixStrAlloc (len + 1);
                    SendMessage (pData->ListBoxControl, LB_GETTEXT, sel, (LPARAM)buffer);
                    SendMessage (pData->EditControl, MSG_SETTEXT, 0, (LPARAM)buffer);
                    DEALLOCATE_LOCAL(buffer);
                    //FreeFixStr (buffer);
                }

                if (dwStyle & CBS_NOTIFY)
                    NotifyParent (hwnd, pCtrl->id, CBN_SELCHANGE);
                break;
            } 

            case IDC_CEDIT:
                if (code == EN_DBLCLK && dwStyle & CBS_NOTIFY) {
                    NotifyParent (hwnd, pCtrl->id, CBN_DBLCLK);
                }
                else if (code == EN_CHANGE) {
                    if (pData->ListBoxControl) {
                        char str [21];
                        GetWindowText (pData->EditControl, str, LEN_SPINVALUE);
                        if (str [0] != '\0') {
                            if ((sel = SendMessage (pData->ListBoxControl, LB_FINDSTRING, 0, (LPARAM)str)) >= 0)
                                SendMessage (pData->ListBoxControl, LB_SETCURSEL, sel, 0);
                        }
                    }

                    if (dwStyle & CBS_NOTIFY)
                        NotifyParent (hwnd, pCtrl->id, CBN_EDITCHANGE);
                 }
                 break;
            }
            break;
        }

        case MSG_GETDLGCODE:
            return DLGC_WANTARROWS | DLGC_WANTENTER;

        case MSG_FONTCHANGED:
            SetWindowFont (pData->EditControl, GetWindowFont (hwnd));
            if (pData->ListBoxControl)
                SetWindowFont (pData->ListBoxControl, GetWindowFont (hwnd));
            return 0;

        case MSG_PAINT:
        {
            HDC hdc;
            hdc = BeginPaint (hwnd);
            ComboBoxDrawSpinButton (hwnd, hdc);    
            EndPaint (hwnd, hdc);
            return 0;
        }

        case CB_GETCHILDREN:
        {
            HWND* wnd_edit = (HWND*)wParam;
            HWND* wnd_listbox = (HWND*)lParam;

            *wnd_edit = pData->EditControl;
            *wnd_listbox = pData->ListBoxControl;
            return 0;
        }

        /* when click the up/down button, spin the value of SIMPLE and AUTOSPIN combobox */
        case CB_SPIN:
            switch (dwStyle & CBS_TYPEMASK) {
            case CBS_SPINLIST:
                if (wParam)
                    SendMessage (pData->ListBoxControl, MSG_KEYDOWN, SCANCODE_CURSORBLOCKDOWN, 0);
                else
                    SendMessage (pData->ListBoxControl, MSG_KEYDOWN, SCANCODE_CURSORBLOCKUP, 0);
                break;

            case CBS_AUTOSPIN:
            {
                char buffer [LEN_SPINVALUE+1];
                int cur_value, new_value;

                GetWindowText (pData->EditControl, buffer, LEN_SPINVALUE);
#if 0
                cur_value = new_value = strtol (buffer, NULL, 0);
#else
                sscanf (buffer, pData->str_format, &cur_value);
                new_value = cur_value;
#endif
                if (wParam) {
                    new_value -= pData->spin_pace;
                }