#include "alfpriv.h"

#include <objbase.h>

static LONG _alf_initLock = 0;
static LONG _alf_initCounter = 0;

/* ALF App and Window */

static void
ALF_InitializeWindowPriv(HWND hwnd, ALFWindowPriv *priv, void *closure)
{
    priv->vtbl = (ALFWindowVTable*)GetClassLongPtr(hwnd, 0);
    priv->closure = closure;
    priv->defid = (WORD)-1;
    ALF_Layout_Init(&priv->layout);
}

static void
ALF_DestroyWindowPriv(ALFWindowPriv *priv)
{
    if (priv->vtbl->postdestroy)
        priv->vtbl->postdestroy(priv->closure);

    ALF_Layout_Clear(&priv->layout);

    if (priv->fonts.hMessageFont)
        DeleteObject(priv->fonts.hMessageFont);

    ALF_Free(priv);
}

int
ALF_CentipointsToPxPriv(ALFWindowPriv *priv, int cptValue)
{
    return MulDiv(cptValue, priv->fonts.dpi, 7200);
}

void
ALF_UpdateFonts(HWND win)
{
    SendMessage(win, ALF_WM_UPDATEFONTS, 0, 0);
}

void
ALF_ApplyFontsPriv(HWND win, ALFWindowPriv *priv)
{
    ALF_Layout_ApplyFonts(&priv->layout, win, &priv->fonts);

    if (priv->vtbl->applyfonts) {
        priv->vtbl->applyfonts(priv->closure, win, &priv->fonts);
    }
}

void
ALF_UpdateFontsPriv(HWND win, ALFWindowPriv *priv)
{
    priv->fonts.dpi = ALF_Compat_GetDpiForWindow(win);

    if (LOBYTE(LOWORD(GetVersion())) < 4) {
        // NT 3.x uses System font for everything, we copy that
        priv->fonts.hMessageFont = (HFONT)GetStockObject(SYSTEM_FONT);
        GetObject(priv->fonts.hMessageFont, sizeof(priv->fonts.lfMessageFont), &priv->fonts.lfMessageFont);
    } else {
        // XXX: SystemParametersInfoForDpi is Unicode-only and needs Vista+ NONCLIENTMETRICS,
        ALF_NONCLIENTMETRICSW_VISTA ncm;
        ZeroMemory(&ncm, sizeof(ncm));
        ncm.cbSize = sizeof(ncm);

        if (ALF_Compat_SystemParametersInfoForDpi(SPI_GETNONCLIENTMETRICS, ncm.cbSize, &ncm, 0, priv->fonts.dpi)) {
#ifdef UNICODE
            priv->fonts.lfMessageFont = ncm.lfMessageFont;
#else
            ALF_Compat_LogFontWtoA(&ncm.lfMessageFont, &priv->fonts.lfMessageFont);
#endif
        } else {
            // FIXME! fallback to default font, 8pt MS Shell Dlg
            ZeroMemory(&priv->fonts.lfMessageFont, sizeof(priv->fonts.lfMessageFont));

            priv->fonts.lfMessageFont.lfHeight = -MulDiv(8, priv->fonts.dpi, 72);
            lstrcpy(priv->fonts.lfMessageFont.lfFaceName, TEXT("MS Shell Dlg"));
        }

        if (priv->fonts.hMessageFont) {
            DeleteObject(priv->fonts.hMessageFont);
        }
        priv->fonts.hMessageFont = CreateFontIndirect(&priv->fonts.lfMessageFont);
    }

    ALF_ApplyFontsPriv(win, priv);
}

void
ALF_ApplyFonts(HWND win)
{
    SendMessage(win, ALF_WM_APPLYFONTS, 0, 0);
}

void
ALF_RecalculateLayout(HWND hwnd)
{
    SIZE dummy;
    SendMessage(hwnd, ALF_WM_QUERYSIZE, 0, (LPARAM)&dummy);
    SendMessage(hwnd, ALF_WM_APPLYLAYOUT, 0, 0);
}

static void
ALF_ApplyFocus(HWND hwnd, ALFWindowPriv *priv, BOOL restoringFocus)
{
    if (priv->hwndFocus) {
        if (!restoringFocus && SendMessage(priv->hwndFocus, WM_GETDLGCODE, 0, 0) & DLGC_HASSETSEL)
            SendMessage(priv->hwndFocus, EM_SETSEL, 0, -1);

        if (GetForegroundWindow() == hwnd)
            SetFocus(priv->hwndFocus);
    } else {
        priv->hwndFocus = GetNextDlgTabItem(hwnd, NULL, FALSE);
        if (priv->hwndFocus)
            ALF_ApplyFocus(hwnd, priv, FALSE);
    }
}

LRESULT
ALF_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
    ALFWindowPriv *priv = (ALFWindowPriv*)GetWindowLongPtr(hwnd, 0);

    if (msg == ALF_WM_GETMODALRESULT) {
        return (LRESULT)priv->modalResult;
    }
    if (msg == ALF_WM_SETMODALRESULT) {
        priv->modalResult = (int)wparam;
        return 0;
    }

    if (msg == ALF_WM_CENTIPOINTTOPX) {
        return (LRESULT)ALF_CentipointsToPxPriv(priv, (int)wparam);
    }

    if (msg == ALF_WM_SETFOCUS) {
        priv->hwndFocus = (HWND)lparam;
        ALF_ApplyFocus(hwnd, priv, FALSE);
        return 0;
    }

    if (msg == ALF_WM_UPDATEFONTS) {
        ALF_UpdateFontsPriv(hwnd, priv);
        return 0;
    }

    if (msg == ALF_WM_APPLYFONTS) {
        ALF_ApplyFontsPriv(hwnd, priv);
        return 0;
    }

    if (msg == ALF_WM_PRETRANSLATEMSG) {
        return (LRESULT)ALF_PreTranslateMessagePriv(hwnd, priv, (MSG *)lparam);
    }

    if (msg == WM_COMMAND) {
        HWND source = (HWND)lparam;
        WORD code   = HIWORD(wparam);
        WORD id     = LOWORD(wparam);
        LRESULT ret = 0;
        if (source != 0)
            ret = SendMessage(source, 0x2000 + WM_COMMAND, wparam, lparam);

        if (ret == 0 && priv->vtbl->command)
            ret = priv->vtbl->command(priv->closure, hwnd, code, id, source);

        return ret;
    }

    if (msg == WM_NOTIFY) {
        NMHDR *nmhdr = (NMHDR *)lparam;
        LRESULT ret = 0;

        if (nmhdr->hwndFrom)
            ret = SendMessage(nmhdr->hwndFrom, 0x2000 + WM_NOTIFY, wparam, lparam);

        if (ret == 0 && priv->vtbl->notify)
            ret = priv->vtbl->notify(priv->closure, hwnd, wparam, nmhdr);

        return ret;
    }

    if (msg == WM_DRAWITEM) {
        LPDRAWITEMSTRUCT dis = (DRAWITEMSTRUCT *)lparam;
        LRESULT ret = 0;
        if (wparam && dis->hwndItem) {
            ret = SendMessage(dis->hwndItem, 0x2000 + WM_DRAWITEM, wparam, lparam);
        }

        if (ret)
            return ret;
    }

    if (msg == WM_ACTIVATE) {
        if (!HIWORD(wparam)) { // if !minimized
            if (LOWORD(wparam)) {
                ALF_ApplyFocus(hwnd, priv, TRUE);
            } else {
                priv->hwndFocus = GetFocus();
            }
        }
        return 0;
    }

    if (msg == WM_SIZE) {
        ALF_Layout_Apply(&priv->layout, hwnd);
    }

    if (msg == WM_GETMINMAXINFO) {
        RECT tmp;
        ZeroMemory(&tmp, sizeof(tmp));
        tmp.right = priv->layout.totalMinWidth;
        tmp.bottom = priv->layout.totalMinHeight;

        if (ALF_Compat_AdjustWindowRectExForDpi(
                               &tmp,
                               GetWindowLong(hwnd, GWL_STYLE),
                               GetMenu(hwnd) != NULL,
                               GetWindowLong(hwnd, GWL_EXSTYLE),
                               priv->fonts.dpi)) {
            MINMAXINFO *i = (MINMAXINFO *)lparam;
            i->ptMinTrackSize.x = tmp.right - tmp.left;
            i->ptMinTrackSize.y = tmp.bottom - tmp.top;
            return 0;
        }
    }

    if (msg == WM_CREATE) {
        if (priv->vtbl->create) {
            priv->vtbl->create(priv->closure, hwnd);
        }
        BOOL alwaysUnderline = FALSE;
        SystemParametersInfo(SPI_GETKEYBOARDCUES, 0, &alwaysUnderline, 0);
        if (!alwaysUnderline) {
            SendMessage(hwnd, WM_UPDATEUISTATE, MAKEWPARAM(UIS_INITIALIZE, 0), 0);
        }
        ALF_UpdateFontsPriv(hwnd, priv);
        ALF_Layout_CalcSizes(&priv->layout, hwnd);
        ALF_Layout_Apply(&priv->layout, hwnd);
    }

    if (msg == WM_DESTROY && priv->vtbl->destroy) {
        priv->vtbl->destroy(priv->closure, hwnd);
    }

    if (msg == WM_CLOSE) {
        if (!priv->vtbl->close || !priv->vtbl->close(priv->closure, hwnd)) {
            priv->modalResult = 2;
            ShowWindow(hwnd, FALSE);
        }
        return TRUE;
    }

    if (msg == WM_NCDESTROY) {
        SetWindowLongPtr(hwnd, 0, 0);
        ALF_DestroyWindowPriv(priv);
    }

    if (msg == WM_DPICHANGED) {
        ALF_UpdateFontsPriv(hwnd, priv);
        ALF_Layout_CalcSizes(&priv->layout, hwnd);
        RECT *r = (RECT*)lparam;
        SetWindowPos(hwnd, NULL, r->left, r->top, r->right-r->left, r->bottom-r->top, SWP_NOACTIVATE|SWP_NOZORDER);
    }

    if (msg == WM_THEMECHANGED || msg == WM_SETTINGCHANGE) {
        ALF_UpdateFontsPriv(hwnd, priv);
        ALF_Layout_CalcSizes(&priv->layout, hwnd);
        ALF_Layout_Apply(&priv->layout, hwnd);
    }

    if (msg == DM_GETDEFID) {
        if (priv->defid == (WORD)-1) {
            return 0;
        } else {
            return MAKELONG(priv->defid, DC_HASDEFID);
        }
    }
    if (msg == DM_SETDEFID) {
        if (priv->defid != (WORD)-1) {
            HWND hwndOld = ALF_WidgetHwndById(hwnd, priv->defid);
            if (hwndOld && SendMessage(hwndOld, WM_GETDLGCODE, 0, 0) & DLGC_DEFPUSHBUTTON) {
                SendMessage(hwndOld, BM_SETSTYLE, BS_PUSHBUTTON, TRUE);
            }
        }

        priv->defid = (WORD)wparam;
        HWND hwndNew = ALF_WidgetHwndById(hwnd, priv->defid);
        if (hwndNew && SendMessage(hwndNew, WM_GETDLGCODE, 0, 0) & DLGC_UNDEFPUSHBUTTON) {
            SendMessage(hwndNew, BM_SETSTYLE, BS_DEFPUSHBUTTON, TRUE);
        }
        return TRUE;
    }

    LRESULT ret = 0;
    if (ALF_Layout_HandleMessage(&priv->layout, hwnd, msg, wparam, lparam, &ret)) {
        return ret;
    }

    return DefWindowProc(hwnd, msg, wparam, lparam);
}

void
ALF_AddWidget(HWND win, UINT x, UINT y, HWND widget, UINT minWidth, UINT minHeight, DWORD flags)
{
    ALFWidgetLayoutParams params;
    ZeroMemory(&params, sizeof(params));
    params.hwnd = widget;
    params.x = x;
    params.y = y;
    params.width = minWidth;
    params.height = minHeight;
    params.flags = flags;
    ALF_AddWidgetEx(win, &params);
}

void ALF_AddWidgetEx(HWND win, const ALFWidgetLayoutParams* params)
{
    SendMessage(win, ALF_WM_ADDWIDGET, 0, (LPARAM)params);
}

static LRESULT CALLBACK
ALF_WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
    if (msg == WM_NCCREATE) {
        CREATESTRUCT *cs = (CREATESTRUCT*)(void*)lparam;
        if (cs->lpCreateParams) {
            ALFWindowPriv *priv = ALF_New(ALFWindowPriv, 1);
            SetWindowLongPtr(hwnd, 0, (LONG_PTR)priv);
            ALF_InitializeWindowPriv(hwnd, priv, *((void**)cs->lpCreateParams));
        }
    }

    ALFWindowPriv *priv = (ALFWindowPriv*)(void*)GetWindowLongPtr(hwnd, 0);
    if (priv != NULL) {
        if (priv->vtbl->message) {
            return priv->vtbl->message(priv->closure, hwnd, msg, wparam, lparam);
        } else {
            return ALF_DefWindowProc(hwnd, msg, wparam, lparam);
        }
    } else {
        return DefWindowProc(hwnd, msg, wparam, lparam);
    }
}

void
ALF_Initialize(void)
{
    // acquire init lock
    while (InterlockedExchange(&_alf_initLock, 1)) {
        Sleep(0);
    }

    // we have the lock!
    if (!_alf_initCounter++) {
        InitCommonControls();

        ALF_LoadCompatFunctions();

        ALF_RegisterComboClass();
        ALF_RegisterPanelClass();
        ALF_RegisterSpacerClass();

        ALF_Compat_BufferedPaintInit();
    }

    // release init lock
    InterlockedExchange(&_alf_initLock, 0);
}

void
ALF_UnInitialize(void)
{
    // acquire init lock
    while (InterlockedExchange(&_alf_initLock, 1)) {
        Sleep(0);
    }

    // we have the lock!
    if (!--_alf_initCounter) {
        ALF_Compat_BufferedPaintUnInit();

        UnregisterClass(_alf_comboClass, ALF_HINSTANCE);
        UnregisterClass(_alf_panelClass, ALF_HINSTANCE);
        UnregisterClass(_alf_spacerClass, ALF_HINSTANCE);

        ALF_UnloadCompatFunctions();
    }

    // release init lock
    InterlockedExchange(&_alf_initLock, 0);
}

void *
ALF_Alloc(SIZE_T nmemb, SIZE_T size)
{
    // FIXME! potential overflow
    return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY|HEAP_GENERATE_EXCEPTIONS, nmemb * size);
}

void *
ALF_ReAlloc(void *ptr, SIZE_T nmemb, SIZE_T size)
{
    // FIXME! potential overflow
    if (ptr)
        return HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY|HEAP_GENERATE_EXCEPTIONS, ptr, nmemb * size);
    else
        return ALF_Alloc(nmemb, size);
}

void
ALF_Free(const void *p)
{
    HeapFree(GetProcessHeap(), 0, (void*)p);
}

void
ALF_BuildUniqueName(TCHAR *buf, const TCHAR *prefix, ULONG_PTR uniquifier)
{
    int prefixlen = lstrlen(prefix);
    CopyMemory(buf, prefix, prefixlen * sizeof(*prefix));

    int numlen = sizeof(LONG_PTR)*2;
    int i = numlen - 1;
    while (i >= 0) {
        buf[prefixlen + i] = "0123456789ABCDEF"[uniquifier & 0xf];
        uniquifier >>= 4;
        i--;
    }
}

LPTSTR
ALF_RegisterWindowClass(HINSTANCE hInstance, const ALFWindowClassParams *params)
{
    WNDCLASS cls;
    ZeroMemory(&cls, sizeof(cls));

    ALFWindowVTable *pvtbl = ALF_New(ALFWindowVTable, 1);
    *pvtbl = params->vtbl;

    const TCHAR *classNamePtr = params->className;
    TCHAR  classNameBuf[256];
    if (!classNamePtr) {
        ZeroMemory(classNameBuf, sizeof(classNameBuf));
        classNamePtr = classNameBuf;

        ALF_BuildUniqueName(classNameBuf, TEXT("ALFWindow."), (ULONG_PTR)pvtbl);
    }

    cls.style = params->classStyle;
    cls.hInstance = hInstance;
    cls.hCursor = LoadCursor(NULL, (LPTSTR)IDC_ARROW);
    if (LOBYTE(LOWORD(GetVersion())) >= 4) {
        cls.hbrBackground = (HBRUSH)(COLOR_BTNFACE+1);
    } else {
        // NT 3.x has white dialog backgrounds
        cls.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    }
    cls.lpszClassName = classNamePtr;
    cls.cbWndExtra = sizeof(void*);
    cls.cbClsExtra = sizeof(void*);
    cls.lpfnWndProc = ALF_WindowProc;

    ATOM classatom = RegisterClass(&cls);
    if (!classatom) {
        ALF_Free(pvtbl);
        return NULL;
    }

    // XXX: This could have been a HWND_MESSAGE window, but Win95 doesn't support these
    HWND tmp = CreateWindowEx(0, MAKEINTATOM(classatom), TEXT("dummy"), 0, 0, 0, 0, 0, NULL, 0, hInstance, 0);
    SetClassLongPtr(tmp, 0, (LONG_PTR)pvtbl);
    DestroyWindow(tmp);

    return MAKEINTATOM(classatom);
}

void
ALF_UnregisterWindowClass(HINSTANCE hinstance, LPCTSTR className)
{
    HWND tmp = CreateWindowEx(0, className, TEXT("dummy"), 0, 0, 0, 0, 0, NULL, 0, hinstance, 0);
    ALFWindowVTable *pvtbl = (ALFWindowVTable*)GetClassLongPtr(tmp, 0);
    DestroyWindow(tmp);

    ALF_Free(pvtbl);

    UnregisterClass(className, hinstance);
}

HWND ALF_InstantiateWindow(HINSTANCE hinstance, LPCTSTR className, HWND hwndParent, void *closure)
{
    return CreateWindowEx(0,
                          className,
                          TEXT("Window"),
                          WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          300, 100, //FIXME
                          hwndParent,
                          NULL,
                          hinstance,
                          &closure);
}

void
ALF_DestroyWindow(HWND win)
{
    DestroyWindow(win);
}

BOOL
ALF_PreTranslateMessage(HWND hwnd, MSG *message)
{
    return (BOOL)SendMessage(hwnd, ALF_WM_PRETRANSLATEMSG, 0, (LPARAM)message);
}

BOOL
ALF_PreTranslateMessagePriv(HWND win, ALFWindowPriv *priv, MSG *message)
{
    BOOL ret = FALSE;

    if (priv->vtbl->pretranslatemessage)
        ret = priv->vtbl->pretranslatemessage(priv->closure, win, message);

    if (!ret)
        ret = IsDialogMessage(win, message);

    return ret;
}

int
ALF_ShowModal(HWND win)
{
    MSG msg;

    ALF_SetModalResult(win, 0);

    // TODO: disable parent window
    ShowWindow(win, SW_SHOW);

    while (GetMessage(&msg, NULL, 0, 0) > 0) {
        // TODO: call application message hooks
        // TODO: call preprocess message hook

        if (!ALF_PreTranslateMessage(win, &msg)) {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }

        int mr = ALF_GetModalResult(win);
        if (mr)
            return mr;
    }

    return 0;
}


void
ALF_SetModalResult(HWND win, int result)
{
    SendMessage(win, ALF_WM_SETMODALRESULT, (WPARAM)result, 0);
}

int
ALF_GetModalResult(HWND win)
{
    return (int)SendMessage(win, ALF_WM_GETMODALRESULT, 0, 0);
}

int
ALF_CentipointsToPixels(HWND win, int cptValue)
{
    return (int)SendMessage(win, ALF_WM_CENTIPOINTTOPX, (WPARAM)cptValue, 0);
}

void
ALF_ResizeWindow(HWND win, int cptWidth, int cptHeight)
{
    int pxwidth = ALF_CentipointsToPixels(win, cptWidth);
    int pxheight = ALF_CentipointsToPixels(win, cptHeight);

    ALF_ResizeWindowPx(win, pxwidth, pxheight);
}

void
ALF_ResizeWindowPx(HWND win, int pxwidth, int pxheight)
{
    MINMAXINFO tmp = {
        { 0, 0 },
        { pxwidth, pxheight },
        { 0, 0 },
        { pxwidth, pxheight },
        { pxwidth, pxheight }
    };
    SendMessage(win, WM_GETMINMAXINFO, 0, (LPARAM)&tmp);

    if (tmp.ptMinTrackSize.x > pxwidth)
        pxwidth = tmp.ptMinTrackSize.x;
    if (tmp.ptMinTrackSize.y > pxheight)
        pxheight = tmp.ptMinTrackSize.y;

    SetWindowPos(win, NULL, 0, 0, pxwidth, pxheight, SWP_NOACTIVATE|SWP_NOMOVE|SWP_NOZORDER);
}

struct ALF_WidgetHwndById_Closure {
    HWND result;
    WORD needle;
};

static BOOL CALLBACK
ALF_WidgetHwndById_EnumChildProc(HWND hwnd, LPARAM lParam)
{
    struct ALF_WidgetHwndById_Closure *closure = (struct ALF_WidgetHwndById_Closure*)lParam;
    if ((WORD)GetWindowLongPtr(hwnd, GWLP_ID) == closure->needle) {
        closure->result = hwnd;
        return FALSE;
    }
    return TRUE;
}

HWND
ALF_WidgetHwndById(HWND win, WORD id)
{
    struct ALF_WidgetHwndById_Closure closure = { 0, id };
    EnumChildWindows(win, ALF_WidgetHwndById_EnumChildProc, (LPARAM)&closure);
    return closure.result;
}

void
ALF_SetText(HWND hwnd, const TCHAR *text)
{
    SendMessage(hwnd, WM_SETTEXT, 0, (LPARAM)text);
}

void
ALF_SetWidgetText(HWND parent, WORD id, const TCHAR *text)
{
    HWND h = ALF_WidgetHwndById(parent, id);
    if (h)
        ALF_SetText(h, text);
}

TCHAR * // free with ALF_Free
ALF_Text(HWND hwnd)
{
    int len = GetWindowTextLength(hwnd);
    if (len > 0) {
        TCHAR *buf = ALF_New(TCHAR, len+1);
        if (GetWindowText(hwnd, buf, len)) {
            return buf;
        } else {
            ALF_Free(buf);
        }
    }

    return NULL;
}

TCHAR * // free with ALF_Free
ALF_WidgetText(HWND parent, WORD id)
{
    HWND h = ALF_WidgetHwndById(parent, id);
    if (h)
        return ALF_Text(h);

    return NULL;
}

DWORD
ALF_WidgetLayoutFlags(HWND parent, HWND widget)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        return p.flags;
    } else {
        return 0;
    }
}

BOOL
ALF_SetWidgetLayoutFlags(HWND parent, HWND widget, DWORD flags)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        p.flags = flags;
        return SendMessage(parent, ALF_WM_SETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p);
    }

    return FALSE;
}

BOOL
ALF_WidgetLayoutPosition(HWND parent, HWND widget, UINT *pX, UINT *pY)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        *pX = p.x;
        *pY = p.y;
        return TRUE;
    } else {
        return FALSE;
    }
}

BOOL
ALF_SetWidgetLayoutPosition(HWND parent, HWND widget, UINT x, UINT y)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        p.x = x;
        p.y = y;
        return SendMessage(parent, ALF_WM_SETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p);
    }

    return FALSE;
}

BOOL
ALF_WidgetLayoutSize(HWND parent, HWND widget, UINT *pCptWidth, UINT *pCptHeight)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        *pCptWidth  = p.width;
        *pCptHeight = p.height;
        return TRUE;
    } else {
        return FALSE;
    }
}

BOOL
ALF_SetWidgetLayoutSize(HWND parent, HWND widget, UINT cptWidth, UINT cptHeight)
{
    ALFWidgetLayoutParams p;
    if (SendMessage(parent, ALF_WM_GETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p)) {
        p.width  = cptWidth;
        p.height = cptHeight;
        return SendMessage(parent, ALF_WM_SETLAYOUTPARAMS, (WPARAM)widget, (LPARAM)&p);
    }

    return FALSE;
}

HWND
ALF_WidgetAtLayoutPosition(HWND parent, UINT x, UINT y)
{
    UINT xy[2] = { x, y };

    return (HWND)SendMessage(parent, ALF_WM_GETWIDGETATPOS, 0, (LPARAM)&xy);
}

BOOL
ALF_ShouldMessageBubble(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
    (void)wparam;
    (void)lparam;

    if (!GetParent(hwnd))
        return FALSE;

    return msg == ALF_WM_CENTIPOINTTOPX
        || msg == WM_COMMAND || msg == WM_NOTIFY
        || msg == WM_MEASUREITEM || msg == WM_DRAWITEM
        || msg == WM_CTLCOLORBTN || msg == WM_CTLCOLOREDIT
        || msg == WM_CTLCOLORLISTBOX || msg == WM_CTLCOLORSCROLLBAR
        || msg == WM_CTLCOLORSTATIC;
}