/*
 * Window position related functions.
 *
 * Copyright 1993, 1994, 1995 Alexandre Julliard
 *                       1995, 1996, 1999 Alex Korobka
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdarg.h>
#include <string.h>
#include "winerror.h"
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winerror.h"
#include "wine/winuser16.h"
#include "wine/server.h"
#include "controls.h"
#include "user.h"
#include "win.h"
#include "message.h"
#include "winpos.h"
#include "nonclient.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(win);

#define HAS_DLGFRAME(style,exStyle) \
    (((exStyle) & WS_EX_DLGMODALFRAME) || \
     (((style) & WS_DLGFRAME) && !((style) & WS_BORDER)))

#define HAS_THICKFRAME(style) \
    (((style) & WS_THICKFRAME) && \
     !(((style) & (WS_DLGFRAME|WS_BORDER)) == WS_DLGFRAME))

#define EMPTYPOINT(pt)          ((*(LONG*)&(pt)) == -1)

#define PLACE_MIN		0x0001
#define PLACE_MAX		0x0002
#define PLACE_RECT		0x0004


#define DWP_MAGIC  ((INT)('W' | ('P' << 8) | ('O' << 16) | ('S' << 24)))

typedef struct
{
    INT       actualCount;
    INT       suggestedCount;
    BOOL      valid;
    INT       wMagic;
    HWND      hwndParent;
    WINDOWPOS winPos[1];
} DWP;

/* ----- internal variables ----- */

static HWND hGlobalShellWindow=0; /*the shell*/
static HWND hGlobalTaskmanWindow=0;
static HWND hGlobalProgmanWindow=0;

static LPCSTR atomInternalPos;


/***********************************************************************
 *           WINPOS_CreateInternalPosAtom
 */
BOOL WINPOS_CreateInternalPosAtom()
{
    LPSTR str = "SysIP";
    atomInternalPos = (LPCSTR)(DWORD)GlobalAddAtomA(str);
    return (atomInternalPos) ? TRUE : FALSE;
}

/***********************************************************************
 *           WINPOS_CheckInternalPos
 *
 * Called when a window is destroyed.
 */
void WINPOS_CheckInternalPos( HWND hwnd )
{
    LPINTERNALPOS lpPos = (LPINTERNALPOS) GetPropA( hwnd, atomInternalPos );

    if( lpPos )
    {
	if( IsWindow(lpPos->hwndIconTitle) )
	    DestroyWindow( lpPos->hwndIconTitle );
	HeapFree( GetProcessHeap(), 0, lpPos );
    }
}

/***********************************************************************
 *		ArrangeIconicWindows (USER32.@)
 */
UINT WINAPI ArrangeIconicWindows( HWND parent )
{
    RECT rectParent;
    HWND hwndChild;
    INT x, y, xspacing, yspacing;

    GetClientRect( parent, &rectParent );
    x = rectParent.left;
    y = rectParent.bottom;
    xspacing = GetSystemMetrics(SM_CXICONSPACING);
    yspacing = GetSystemMetrics(SM_CYICONSPACING);

    hwndChild = GetWindow( parent, GW_CHILD );
    while (hwndChild)
    {
        if( IsIconic( hwndChild ) )
        {
            WINPOS_ShowIconTitle( hwndChild, FALSE );

            SetWindowPos( hwndChild, 0, x + (xspacing - GetSystemMetrics(SM_CXICON)) / 2,
                            y - yspacing - GetSystemMetrics(SM_CYICON)/2, 0, 0,
                            SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE );
	    if( IsWindow(hwndChild) )
                WINPOS_ShowIconTitle(hwndChild , TRUE );

            if (x <= rectParent.right - xspacing) x += xspacing;
            else
            {
                x = rectParent.left;
                y -= yspacing;
            }
        }
        hwndChild = GetWindow( hwndChild, GW_HWNDNEXT );
    }
    return yspacing;
}


/***********************************************************************
 *		SwitchToThisWindow (USER32.@)
 */
void WINAPI SwitchToThisWindow( HWND hwnd, BOOL restore )
{
    ShowWindow( hwnd, restore ? SW_RESTORE : SW_SHOWMINIMIZED );
}


/***********************************************************************
 *		GetWindowRect (USER32.@)
 */
BOOL WINAPI GetWindowRect( HWND hwnd, LPRECT rect )
{
    BOOL ret = WIN_GetRectangles( hwnd, rect, NULL );
    if (ret)
    {
        MapWindowPoints( GetAncestor( hwnd, GA_PARENT ), 0, (POINT *)rect, 2 );
        TRACE( "hwnd %p (%ld,%ld)-(%ld,%ld)\n",
               hwnd, rect->left, rect->top, rect->right, rect->bottom);
    }
    return ret;
}


/***********************************************************************
 *		GetWindowRgn (USER32.@)
 */
int WINAPI GetWindowRgn ( HWND hwnd, HRGN hrgn )
{
    int nRet = ERROR;
    WND *wndPtr = WIN_GetPtr( hwnd );

    if (wndPtr == WND_OTHER_PROCESS)
    {
        if (IsWindow( hwnd ))
            FIXME( "not supported on other process window %p\n", hwnd );
        wndPtr = NULL;
    }
    if (!wndPtr)
    {
        SetLastError( ERROR_INVALID_WINDOW_HANDLE );
        return ERROR;
    }
    if (wndPtr->hrgnWnd) nRet = CombineRgn( hrgn, wndPtr->hrgnWnd, 0, RGN_COPY );
    WIN_ReleasePtr( wndPtr );
    return nRet;
}


/***********************************************************************
 *		SetWindowRgn (USER32.@)
 */
int WINAPI SetWindowRgn( HWND hwnd, HRGN hrgn, BOOL bRedraw )
{
    RECT rect;
    WND *wndPtr;

    if (hrgn) /* verify that region really exists */
    {
        if (GetRgnBox( hrgn, &rect ) == ERROR) return FALSE;
    }

    if (USER_Driver.pSetWindowRgn)
        return USER_Driver.pSetWindowRgn( hwnd, hrgn, bRedraw );

    if ((wndPtr = WIN_GetPtr( hwnd )) == WND_OTHER_PROCESS)
    {
        if (IsWindow( hwnd ))
            FIXME( "not supported on other process window %p\n", hwnd );
        wndPtr = NULL;
    }
    if (!wndPtr)
    {
        SetLastError( ERROR_INVALID_WINDOW_HANDLE );
        return FALSE;
    }

    if (wndPtr->hrgnWnd == hrgn)
    {
        WIN_ReleasePtr( wndPtr );
        return TRUE;
    }

    if (wndPtr->hrgnWnd)
    {
        /* delete previous region */
        DeleteObject(wndPtr->hrgnWnd);
        wndPtr->hrgnWnd = 0;
    }
    wndPtr->hrgnWnd = hrgn;
    WIN_ReleasePtr( wndPtr );

    /* Size the window to the rectangle of the new region (if it isn't NULL) */
    if (hrgn) SetWindowPos( hwnd, 0, rect.left, rect.top,
                            rect.right  - rect.left, rect.bottom - rect.top,
                            SWP_NOSIZE | SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOACTIVATE |
                            SWP_NOZORDER | (bRedraw ? 0 : SWP_NOREDRAW) );
    return TRUE;
}


/***********************************************************************
 *		GetClientRect (USER32.@)
 */
BOOL WINAPI GetClientRect( HWND hwnd, LPRECT rect )
{
    BOOL ret;

    rect->right = rect->bottom = 0;
    if ((ret = WIN_GetRectangles( hwnd, NULL, rect )))
    {
        rect->right -= rect->left;
        rect->bottom -= rect->top;
    }
    rect->left = rect->top = 0;
    return ret;
}


/*******************************************************************
 *		ClientToScreen (USER32.@)
 */
BOOL WINAPI ClientToScreen( HWND hwnd, LPPOINT lppnt )
{
    MapWindowPoints( hwnd, 0, lppnt, 1 );
    return TRUE;
}


/*******************************************************************
 *		ScreenToClient (USER32.@)
 */
BOOL WINAPI ScreenToClient( HWND hwnd, LPPOINT lppnt )
{
    MapWindowPoints( 0, hwnd, lppnt, 1 );
    return TRUE;
}


/***********************************************************************
 *           find_child_from_point
 *
 * Find the child that contains pt. Helper for WindowFromPoint.
 * pt is in parent client coordinates.
 * lparam is the param to pass in the WM_NCHITTEST message.
 */
static HWND find_child_from_point( HWND parent, POINT pt, INT *hittest, LPARAM lparam )
{
    int i, res;
    LONG style, exstyle;
    RECT rectWindow, rectClient;
    WND *wndPtr;
    HWND *list = WIN_ListChildren( parent );
    HWND retvalue = 0;

    if (!list) return 0;
    for (i = 0; list[i]; i++)
    {
        /* If point is in window, and window is visible, and it  */
        /* is enabled (or it's a top-level window), then explore */
        /* its children. Otherwise, go to the next window.       */

        style = GetWindowLongW( list[i], GWL_STYLE );
        if (!(style & WS_VISIBLE)) continue;  /* not visible -> skip */
        if ((style & (WS_POPUP | WS_CHILD | WS_DISABLED)) == (WS_CHILD | WS_DISABLED))
            continue;  /* disabled child -> skip */
        exstyle = GetWindowLongW( list[i], GWL_EXSTYLE );
        if ((exstyle & (WS_EX_LAYERED | WS_EX_TRANSPARENT)) == (WS_EX_LAYERED | WS_EX_TRANSPARENT))
            continue;  /* transparent -> skip */

        if (!WIN_GetRectangles( list[i], &rectWindow, &rectClient )) continue;
        if (!PtInRect( &rectWindow, pt )) continue;  /* not in window -> skip */

        /* FIXME: check window region for other processes too */
        if ((wndPtr = WIN_GetPtr( list[i] )) && wndPtr != WND_OTHER_PROCESS)
        {
            if (wndPtr->hrgnWnd && !PtInRegion( wndPtr->hrgnWnd,
                                                pt.x - rectWindow.left, pt.y - rectWindow.top ))
            {
                WIN_ReleasePtr( wndPtr );
                continue;  /* point outside window region -> skip */
            }
            WIN_ReleasePtr( wndPtr );
        }

        /* If window is minimized or disabled, return at once */
        if (style & WS_MINIMIZE)
        {
            *hittest = HTCAPTION;
            retvalue = list[i];
            break;
        }
        if (style & WS_DISABLED)
        {
            *hittest = HTERROR;
            retvalue = list[i];
            break;
        }

        /* If point is in client area, explore children */
        if (PtInRect( &rectClient, pt ))
        {
            POINT new_pt;

            new_pt.x = pt.x - rectClient.left;
            new_pt.y = pt.y - rectClient.top;
            if ((retvalue = find_child_from_point( list[i], new_pt, hittest, lparam ))) break;
        }

        /* Now it's inside window, send WM_NCCHITTEST (if same thread) */
        if (!WIN_IsCurrentThread( list[i] ))
        {
            *hittest = HTCLIENT;
            retvalue = list[i];
            break;
        }
        if ((res = SendMessageA( list[i], WM_NCHITTEST, 0, lparam )) != HTTRANSPARENT)
        {
            *hittest = res;  /* Found the window */
            retvalue = list[i];
            break;
        }
        /* continue search with next sibling */
    }
    HeapFree( GetProcessHeap(), 0, list );
    return retvalue;
}


/***********************************************************************
 *           WINPOS_WindowFromPoint
 *
 * Find the window and hittest for a given point.
 */
HWND WINPOS_WindowFromPoint( HWND hwndScope, POINT pt, INT *hittest )
{
    POINT xy = pt;
    int res;
    LONG style;

    TRACE("scope %p %ld,%ld\n", hwndScope, pt.x, pt.y);

    if (!hwndScope) hwndScope = GetDesktopWindow();
    style = GetWindowLongW( hwndScope, GWL_STYLE );

    *hittest = HTERROR;
    if (style & WS_DISABLED) return 0;

    MapWindowPoints( GetDesktopWindow(), GetAncestor( hwndScope, GA_PARENT ), &xy, 1 );

    if (!(style & WS_MINIMIZE))
    {
        RECT rectClient;
        if (WIN_GetRectangles( hwndScope, NULL, &rectClient ) && PtInRect( &rectClient, xy ))
        {
            HWND ret;

            xy.x -= rectClient.left;
            xy.y -= rectClient.top;
            if ((ret = find_child_from_point( hwndScope, xy, hittest, MAKELONG( pt.x, pt.y ) )))
            {
                TRACE( "found child %p\n", ret );
                return ret;
            }
        }
    }

    /* If nothing found, try the scope window */
    if (!WIN_IsCurrentThread( hwndScope ))
    {
        *hittest = HTCLIENT;
        TRACE( "returning %p\n", hwndScope );
        return hwndScope;
    }
    res = SendMessageA( hwndScope, WM_NCHITTEST, 0, MAKELONG( pt.x, pt.y ) );
    if (res != HTTRANSPARENT)
    {
        *hittest = res;  /* Found the window */
        TRACE( "returning %p\n", hwndScope );
        return hwndScope;
    }
    *hittest = HTNOWHERE;
    TRACE( "nothing found\n" );
    return 0;
}


/*******************************************************************
 *		WindowFromPoint (USER32.@)
 */
HWND WINAPI WindowFromPoint( POINT pt )
{
    INT hittest;
    return WINPOS_WindowFromPoint( 0, pt, &hittest );
}


/*******************************************************************
 *		ChildWindowFromPoint (USER32.@)
 */
HWND WINAPI ChildWindowFromPoint( HWND hwndParent, POINT pt )
{
    return ChildWindowFromPointEx( hwndParent, pt, CWP_ALL );
}

/*******************************************************************
 *		ChildWindowFromPointEx (USER32.@)
 */
HWND WINAPI ChildWindowFromPointEx( HWND hwndParent, POINT pt, UINT uFlags)
{
    /* pt is in the client coordinates */
    HWND *list;
    int i;
    RECT rect;
    HWND retvalue;

    GetClientRect( hwndParent, &rect );
    if (!PtInRect( &rect, pt )) return 0;
    if (!(list = WIN_ListChildren( hwndParent ))) return 0;

    for (i = 0; list[i]; i++)
    {
        if (!WIN_GetRectangles( list[i], &rect, NULL )) continue;
        if (!PtInRect( &rect, pt )) continue;
        if (uFlags & (CWP_SKIPINVISIBLE|CWP_SKIPDISABLED))
        {
            LONG style = GetWindowLongW( list[i], GWL_STYLE );
            if ((uFlags & CWP_SKIPINVISIBLE) && !(style & WS_VISIBLE)) continue;
            if ((uFlags & CWP_SKIPDISABLED) && (style & WS_DISABLED)) continue;
        }
        if (uFlags & CWP_SKIPTRANSPARENT)
        {
            if (GetWindowLongW( list[i], GWL_EXSTYLE ) & WS_EX_TRANSPARENT) continue;
        }
        break;
    }
    retvalue = list[i];
    HeapFree( GetProcessHeap(), 0, list );
    if (!retvalue) retvalue = hwndParent;
    return retvalue;
}


/*******************************************************************
 *         WINPOS_GetWinOffset
 *
 * Calculate the offset between the origin of the two windows. Used
 * to implement MapWindowPoints.
 */
static void WINPOS_GetWinOffset( HWND hwndFrom, HWND hwndTo, POINT *offset )
{
    WND * wndPtr;

    offset->x = offset->y = 0;

    /* Translate source window origin to screen coords */
    if (hwndFrom)
    {
        HWND hwnd = hwndFrom;

        while (hwnd)
        {
            if (hwnd == hwndTo) return;
            if (!(wndPtr = WIN_GetPtr( hwnd )))
            {
                ERR( "bad hwndFrom = %p\n", hwnd );
                return;
            }
            if (wndPtr == WND_OTHER_PROCESS) goto other_process;
            offset->x += wndPtr->rectClient.left;
            offset->y += wndPtr->rectClient.top;
            hwnd = wndPtr->parent;
            WIN_ReleasePtr( wndPtr );
        }
    }

    /* Translate origin to destination window coords */
    if (hwndTo)
    {
        HWND hwnd = hwndTo;

        while (hwnd)
        {
            if (!(wndPtr = WIN_GetPtr( hwnd )))
            {
                ERR( "bad hwndTo = %p\n", hwnd );
                return;
            }
            if (wndPtr == WND_OTHER_PROCESS) goto other_process;
            offset->x -= wndPtr->rectClient.left;
            offset->y -= wndPtr->rectClient.top;
            hwnd = wndPtr->parent;
            WIN_ReleasePtr( wndPtr );
        }
    }
    return;

 other_process:  /* one of the parents may belong to another process, do it the hard way */
    offset->x = offset->y = 0;
    SERVER_START_REQ( get_windows_offset )
    {
        req->from = hwndFrom;
        req->to   = hwndTo;
        if (!wine_server_call( req ))
        {
            offset->x = reply->x;
            offset->y = reply->y;
        }
    }
    SERVER_END_REQ;
}


/*******************************************************************
 *		MapWindowPoints (USER.258)
 */
void WINAPI MapWindowPoints16( HWND16 hwndFrom, HWND16 hwndTo,
                               LPPOINT16 lppt, UINT16 count )
{
    POINT offset;

    WINPOS_GetWinOffset( WIN_Handle32(hwndFrom), WIN_Handle32(hwndTo), &offset );
    while (count--)
    {
	lppt->x += offset.x;
	lppt->y += offset.y;
        lppt++;
    }
}


/*******************************************************************
 *		MapWindowPoints (USER32.@)
 */
INT WINAPI MapWindowPoints( HWND hwndFrom, HWND hwndTo, LPPOINT lppt, UINT count )
{
    POINT offset;

    WINPOS_GetWinOffset( hwndFrom, hwndTo, &offset );
    while (count--)
    {
	lppt->x += offset.x;
	lppt->y += offset.y;
        lppt++;
    }
    return MAKELONG( LOWORD(offset.x), LOWORD(offset.y) );
}


/***********************************************************************
 *		IsIconic (USER32.@)
 */
BOOL WINAPI IsIconic(HWND hWnd)
{
    return (GetWindowLongW( hWnd, GWL_STYLE ) & WS_MINIMIZE) != 0;
}


/***********************************************************************
 *		IsZoomed (USER32.@)
 */
BOOL WINAPI IsZoomed(HWND hWnd)
{
    return (GetWindowLongW( hWnd, GWL_STYLE ) & WS_MAXIMIZE) != 0;
}


/*******************************************************************
 *		AllowSetForegroundWindow (USER32.@)
 */
BOOL WINAPI AllowSetForegroundWindow( DWORD procid )
{
    /* FIXME: If Win98/2000 style SetForegroundWindow behavior is
     * implemented, then fix this function. */
    return TRUE;
}


/*******************************************************************
 *		LockSetForegroundWindow (USER32.@)
 */
BOOL WINAPI LockSetForegroundWindow( UINT lockcode )
{
    /* FIXME: If Win98/2000 style SetForegroundWindow behavior is
     * implemented, then fix this function. */
    return TRUE;
}


/*******************************************************************
 *		SetShellWindow (USER32.@)
 */
HWND WINAPI SetShellWindow(HWND hwndshell)
{   WARN("(hWnd=%p) semi stub\n",hwndshell );

    hGlobalShellWindow = WIN_GetFullHandle( hwndshell );
    return hGlobalShellWindow;
}


/*******************************************************************
 *		GetShellWindow (USER32.@)
 */
HWND WINAPI GetShellWindow(void)
{   WARN("(hWnd=%p) semi stub\n",hGlobalShellWindow );

    return hGlobalShellWindow;
}


/***********************************************************************
 *		BringWindowToTop (USER32.@)
 */
BOOL WINAPI BringWindowToTop( HWND hwnd )
{
    return SetWindowPos( hwnd, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE|SWP_NOSIZE );
}


/***********************************************************************
 *		MoveWindow (USER32.@)
 */
BOOL WINAPI MoveWindow( HWND hwnd, INT x, INT y, INT cx, INT cy,
                            BOOL repaint )
{
    int flags = SWP_NOZORDER | SWP_NOACTIVATE;
    if (!repaint) flags |= SWP_NOREDRAW;
    TRACE("%p %d,%d %dx%d %d\n", hwnd, x, y, cx, cy, repaint );
    return SetWindowPos( hwnd, 0, x, y, cx, cy, flags );
}

/***********************************************************************
 *           WINPOS_InitInternalPos
 */
static LPINTERNALPOS WINPOS_InitInternalPos( WND* wnd, POINT pt, const RECT *restoreRect )
{
    LPINTERNALPOS lpPos = (LPINTERNALPOS) GetPropA( wnd->hwndSelf,
                                                      atomInternalPos );
    if( !lpPos )
    {
	/* this happens when the window is minimized/maximized
	 * for the first time (rectWindow is not adjusted yet) */

	lpPos = HeapAlloc( GetProcessHeap(), 0, sizeof(INTERNALPOS) );
	if( !lpPos ) return NULL;

	SetPropA( wnd->hwndSelf, atomInternalPos, (HANDLE)lpPos );
	lpPos->hwndIconTitle = 0; /* defer until needs to be shown */
        CONV_RECT32TO16( &wnd->rectWindow, &lpPos->rectNormal );
	*(UINT*)&lpPos->ptIconPos = *(UINT*)&lpPos->ptMaxPos = 0xFFFFFFFF;
    }

    if( wnd->dwStyle & WS_MINIMIZE )
	CONV_POINT32TO16( &pt, &lpPos->ptIconPos );
    else if( wnd->dwStyle & WS_MAXIMIZE )
	CONV_POINT32TO16( &pt, &lpPos->ptMaxPos );
    else if( restoreRect )
	CONV_RECT32TO16( restoreRect, &lpPos->rectNormal );

    return lpPos;
}

/***********************************************************************
 *           WINPOS_RedrawIconTitle
 */
BOOL WINPOS_RedrawIconTitle( HWND hWnd )
{
    LPINTERNALPOS lpPos = (LPINTERNALPOS)GetPropA( hWnd, atomInternalPos );
    if( lpPos )
    {
	if( lpPos->hwndIconTitle )
	{
	    SendMessageA( lpPos->hwndIconTitle, WM_SHOWWINDOW, TRUE, 0);
	    InvalidateRect( lpPos->hwndIconTitle, NULL, TRUE );
	    return TRUE;
	}
    }
    return FALSE;
}

/***********************************************************************
 *           WINPOS_ShowIconTitle
 */
BOOL WINPOS_ShowIconTitle( HWND hwnd, BOOL bShow )
{
    LPINTERNALPOS lpPos = (LPINTERNALPOS)GetPropA( hwnd, atomInternalPos );

    if( lpPos && !(GetWindowLongA( hwnd, GWL_EXSTYLE) & WS_EX_MANAGED))
    {
        HWND title = lpPos->hwndIconTitle;

	TRACE("%p %i\n", hwnd, (bShow != 0) );

	if( !title )
	    lpPos->hwndIconTitle = title = ICONTITLE_Create( hwnd );
	if( bShow )
        {
            if (!IsWindowVisible(title))
            {
                SendMessageA( title, WM_SHOWWINDOW, TRUE, 0 );
                SetWindowPos( title, 0, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOMOVE |
                              SWP_NOACTIVATE | SWP_NOZORDER | SWP_SHOWWINDOW );
            }
	}
	else ShowWindow( title, SW_HIDE );
    }
    return FALSE;
}

/*******************************************************************
 *           WINPOS_GetMinMaxInfo
 *
 * Get the minimized and maximized information for a window.
 */
void WINPOS_GetMinMaxInfo( HWND hwnd, POINT *maxSize, POINT *maxPos,
			   POINT *minTrack, POINT *maxTrack )
{
    LPINTERNALPOS lpPos;
    MINMAXINFO MinMax;
    INT xinc, yinc;
    LONG style = GetWindowLongA( hwnd, GWL_STYLE );
    LONG exstyle = GetWindowLongA( hwnd, GWL_EXSTYLE );

    /* Compute default values */

    MinMax.ptMaxSize.x = GetSystemMetrics(SM_CXSCREEN);
    MinMax.ptMaxSize.y = GetSystemMetrics(SM_CYSCREEN);
    MinMax.ptMinTrackSize.x = GetSystemMetrics(SM_CXMINTRACK);
    MinMax.ptMinTrackSize.y = GetSystemMetrics(SM_CYMINTRACK);
    MinMax.ptMaxTrackSize.x = GetSystemMetrics(SM_CXSCREEN);
    MinMax.ptMaxTrackSize.y = GetSystemMetrics(SM_CYSCREEN);

    if (HAS_DLGFRAME( style, exstyle ))
    {
        xinc = GetSystemMetrics(SM_CXDLGFRAME);
        yinc = GetSystemMetrics(SM_CYDLGFRAME);
    }
    else
    {
        xinc = yinc = 0;
        if (HAS_THICKFRAME(style))
        {
            xinc += GetSystemMetrics(SM_CXFRAME);
            yinc += GetSystemMetrics(SM_CYFRAME);
        }
        if (style & WS_BORDER)
        {
            xinc += GetSystemMetrics(SM_CXBORDER);
            yinc += GetSystemMetrics(SM_CYBORDER);
        }
    }
    MinMax.ptMaxSize.x += 2 * xinc;
    MinMax.ptMaxSize.y += 2 * yinc;

    lpPos = (LPINTERNALPOS)GetPropA( hwnd, atomInternalPos );
    if( lpPos && !EMPTYPOINT(lpPos->ptMaxPos) )
	CONV_POINT16TO32( &lpPos->ptMaxPos, &MinMax.ptMaxPosition );
    else
    {
        MinMax.ptMaxPosition.x = -xinc;
        MinMax.ptMaxPosition.y = -yinc;
    }

    SendMessageA( hwnd, WM_GETMINMAXINFO, 0, (LPARAM)&MinMax );

      /* Some sanity checks */

    TRACE("%ld %ld / %ld %ld / %ld %ld / %ld %ld\n",
                      MinMax.ptMaxSize.x, MinMax.ptMaxSize.y,
                      MinMax.ptMaxPosition.x, MinMax.ptMaxPosition.y,
                      MinMax.ptMaxTrackSize.x, MinMax.ptMaxTrackSize.y,
                      MinMax.ptMinTrackSize.x, MinMax.ptMinTrackSize.y);
    MinMax.ptMaxTrackSize.x = max( MinMax.ptMaxTrackSize.x,
                                   MinMax.ptMinTrackSize.x );
    MinMax.ptMaxTrackSize.y = max( MinMax.ptMaxTrackSize.y,
                                   MinMax.ptMinTrackSize.y );

    if (maxSize) *maxSize = MinMax.ptMaxSize;
    if (maxPos) *maxPos = MinMax.ptMaxPosition;
    if (minTrack) *minTrack = MinMax.ptMinTrackSize;
    if (maxTrack) *maxTrack = MinMax.ptMaxTrackSize;
}

/***********************************************************************
 *		ShowWindowAsync (USER32.@)
 *
 * doesn't wait; returns immediately.
 * used by threads to toggle windows in other (possibly hanging) threads
 */
BOOL WINAPI ShowWindowAsync( HWND hwnd, INT cmd )
{
    HWND full_handle;

    if (is_broadcast(hwnd))
    {
        SetLastError( ERROR_INVALID_PARAMETER );
        return FALSE;
    }

    if ((full_handle = WIN_IsCurrentThread( hwnd )))
        return USER_Driver.pShowWindow( full_handle, cmd );
    return SendNotifyMessageW( hwnd, WM_WINE_SHOWWINDOW, cmd, 0 );
}


/***********************************************************************
 *		ShowWindow (USER32.@)
 */
BOOL WINAPI ShowWindow( HWND hwnd, INT cmd )
{
    HWND full_handle;

    if (is_broadcast(hwnd))
    {
        SetLastError( ERROR_INVALID_PARAMETER );
        return FALSE;
    }
    if ((full_handle = WIN_IsCurrentThread( hwnd )))
    {
        if (USER_Driver.pShowWindow)
            return USER_Driver.pShowWindow( full_handle, cmd );
        return FALSE;
    }
    return SendMessageW( hwnd, WM_WINE_SHOWWINDOW, cmd, 0 );
}


/***********************************************************************
 *		GetInternalWindowPos (USER32.@)
 */
UINT WINAPI GetInternalWindowPos( HWND hwnd, LPRECT rectWnd,
                                      LPPOINT ptIcon )
{
    WINDOWPLACEMENT wndpl;
    if (GetWindowPlacement( hwnd, &wndpl ))
    {
	if (rectWnd) *rectWnd = wndpl.rcNormalPosition;
	if (ptIcon)  *ptIcon = wndpl.ptMinPosition;
	return wndpl.showCmd;
    }
    return 0;
}


/***********************************************************************
 *		GetWindowPlacement (USER32.@)
 *
 * Win95:
 * Fails if wndpl->length of Win95 (!) apps is invalid.
 */
BOOL WINAPI GetWindowPlacement( HWND hwnd, WINDOWPLACEMENT *wndpl )
{
    WND *pWnd = WIN_FindWndPtr( hwnd );
    LPINTERNALPOS lpPos;

    if(!pWnd ) return FALSE;

    lpPos = WINPOS_InitInternalPos( pWnd, *(LPPOINT)&pWnd->rectWindow.left, &pWnd->rectWindow );
    wndpl->length  = sizeof(*wndpl);
    if( pWnd->dwStyle & WS_MINIMIZE )
        wndpl->showCmd = SW_SHOWMINIMIZED;
    else
        wndpl->showCmd = ( pWnd->dwStyle & WS_MAXIMIZE ) ? SW_SHOWMAXIMIZED : SW_SHOWNORMAL ;
    if( pWnd->flags & WIN_RESTORE_MAX )
        wndpl->flags = WPF_RESTORETOMAXIMIZED;
    else
        wndpl->flags = 0;
    CONV_POINT16TO32( &lpPos->ptIconPos, &wndpl->ptMinPosition );
    CONV_POINT16TO32( &lpPos->ptMaxPos, &wndpl->ptMaxPosition );
    CONV_RECT16TO32( &lpPos->rectNormal, &wndpl->rcNormalPosition );
    WIN_ReleaseWndPtr(pWnd);
    return TRUE;
}


/***********************************************************************
 *           WINPOS_SetPlacement
 */
static BOOL WINPOS_SetPlacement( HWND hwnd, const WINDOWPLACEMENT *wndpl, UINT flags )
{
    WND *pWnd = WIN_FindWndPtr( hwnd );
    if( pWnd )
    {
	LPINTERNALPOS lpPos = (LPINTERNALPOS)WINPOS_InitInternalPos( pWnd,
			     *(LPPOINT)&pWnd->rectWindow.left, &pWnd->rectWindow );

	if( flags & PLACE_MIN ) CONV_POINT32TO16( &wndpl->ptMinPosition, &lpPos->ptIconPos );
	if( flags & PLACE_MAX ) CONV_POINT32TO16( &wndpl->ptMaxPosition, &lpPos->ptMaxPos );
	if( flags & PLACE_RECT) CONV_RECT32TO16( &wndpl->rcNormalPosition, &lpPos->rectNormal );

	if( pWnd->dwStyle & WS_MINIMIZE )
	{
	    WINPOS_ShowIconTitle( pWnd->hwndSelf, FALSE );
	    if( wndpl->flags & WPF_SETMINPOSITION && !EMPTYPOINT(lpPos->ptIconPos))
		SetWindowPos( hwnd, 0, lpPos->ptIconPos.x, lpPos->ptIconPos.y,
				0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE );
	}
	else if( pWnd->dwStyle & WS_MAXIMIZE )
	{
	    if( !EMPTYPOINT(lpPos->ptMaxPos) )
		SetWindowPos( hwnd, 0, lpPos->ptMaxPos.x, lpPos->ptMaxPos.y,
				0, 0, SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE );
	}
	else if( flags & PLACE_RECT )
		SetWindowPos( hwnd, 0, lpPos->rectNormal.left, lpPos->rectNormal.top,
				lpPos->rectNormal.right - lpPos->rectNormal.left,
				lpPos->rectNormal.bottom - lpPos->rectNormal.top,
				SWP_NOZORDER | SWP_NOACTIVATE );

	ShowWindow( hwnd, wndpl->showCmd );
	if( IsWindow(hwnd) && pWnd->dwStyle & WS_MINIMIZE )
	{
	    if( pWnd->dwStyle & WS_VISIBLE ) WINPOS_ShowIconTitle( pWnd->hwndSelf, TRUE );

	    /* SDK: ...valid only the next time... */
	    if( wndpl->flags & WPF_RESTORETOMAXIMIZED ) pWnd->flags |= WIN_RESTORE_MAX;
	}
        WIN_ReleaseWndPtr(pWnd);
	return TRUE;
    }
    return FALSE;
}


/***********************************************************************
 *		SetWindowPlacement (USER32.@)
 *
 * Win95:
 * Fails if wndpl->length of Win95 (!) apps is invalid.
 */
BOOL WINAPI SetWindowPlacement( HWND hwnd, const WINDOWPLACEMENT *wpl )
{
    if (!wpl) return FALSE;
    return WINPOS_SetPlacement( hwnd, wpl, PLACE_MIN | PLACE_MAX | PLACE_RECT );
}


/***********************************************************************
 *		AnimateWindow (USER32.@)
 *		Shows/Hides a window with an animation
 *		NO ANIMATION YET
 */
BOOL WINAPI AnimateWindow(HWND hwnd, DWORD dwTime, DWORD dwFlags)
{
	FIXME("partial stub\n");

	/* If trying to show/hide and it's already   *
	 * shown/hidden or invalid window, fail with *
	 * invalid parameter                         */
	if(!IsWindow(hwnd) ||
	   (IsWindowVisible(hwnd) && !(dwFlags & AW_HIDE)) ||
	   (!IsWindowVisible(hwnd) && (dwFlags & AW_HIDE)))
	{
		SetLastError(ERROR_INVALID_PARAMETER);
		return FALSE;
	}

	ShowWindow(hwnd, (dwFlags & AW_HIDE) ? SW_HIDE : ((dwFlags & AW_ACTIVATE) ? SW_SHOW : SW_SHOWNA));

	return TRUE;
}

/***********************************************************************
 *		SetInternalWindowPos (USER32.@)
 */
void WINAPI SetInternalWindowPos( HWND hwnd, UINT showCmd,
                                    LPRECT rect, LPPOINT pt )
{
    if( IsWindow(hwnd) )
    {
        WINDOWPLACEMENT wndpl;
	UINT flags;

	wndpl.length  = sizeof(wndpl);
	wndpl.showCmd = showCmd;
	wndpl.flags = flags = 0;

	if( pt )
	{
            flags |= PLACE_MIN;
            wndpl.flags |= WPF_SETMINPOSITION;
            wndpl.ptMinPosition = *pt;
	}
	if( rect )
	{
            flags |= PLACE_RECT;
            wndpl.rcNormalPosition = *rect;
	}
        WINPOS_SetPlacement( hwnd, &wndpl, flags );
    }
}


/*******************************************************************
 *         can_activate_window
 *
 * Check if we can activate the specified window.
 */
static BOOL can_activate_window( HWND hwnd )
{
    LONG style;

    if (!hwnd) return FALSE;
    style = GetWindowLongW( hwnd, GWL_STYLE );
    if (!(style & WS_VISIBLE)) return FALSE;
    if ((style & (WS_POPUP|WS_CHILD)) == WS_CHILD) return FALSE;
    return !(style & WS_DISABLED);
}


/*******************************************************************
 *         WINPOS_ActivateOtherWindow
 *
 *  Activates window other than pWnd.
 */
void WINPOS_ActivateOtherWindow(HWND hwnd)
{
    HWND hwndTo, fg;

    if ((GetWindowLongW( hwnd, GWL_STYLE ) & WS_POPUP) && (hwndTo = GetWindow( hwnd, GW_OWNER )))
    {
        hwndTo = GetAncestor( hwndTo, GA_ROOT );
        if (can_activate_window( hwndTo )) goto done;
    }

    hwndTo = hwnd;
    for (;;)
    {
        if (!(hwndTo = GetWindow( hwndTo, GW_HWNDNEXT ))) break;
        if (can_activate_window( hwndTo )) break;
    }

 done:
    fg = GetForegroundWindow();
    TRACE("win = %p fg = %p\n", hwndTo, fg);
    if (!fg || (hwnd == fg))
    {
        if (SetForegroundWindow( hwndTo )) return;
    }
    if (!SetActiveWindow( hwndTo )) SetActiveWindow(0);
}


/***********************************************************************
 *           WINPOS_HandleWindowPosChanging16
 *
 * Default handling for a WM_WINDOWPOSCHANGING. Called from DefWindowProc().
 */
LONG WINPOS_HandleWindowPosChanging16( HWND hwnd, WINDOWPOS16 *winpos )
{
    POINT maxSize, minTrack;
    LONG style = GetWindowLongA( hwnd, GWL_STYLE );

    if (winpos->flags & SWP_NOSIZE) return 0;
    if ((style & WS_THICKFRAME) || ((style & (WS_POPUP | WS_CHILD)) == 0))
    {
	WINPOS_GetMinMaxInfo( hwnd, &maxSize, NULL, &minTrack, NULL );
	if (maxSize.x < winpos->cx) winpos->cx = maxSize.x;
	if (maxSize.y < winpos->cy) winpos->cy = maxSize.y;
	if (!(style & WS_MINIMIZE))
	{
	    if (winpos->cx < minTrack.x ) winpos->cx = minTrack.x;
	    if (winpos->cy < minTrack.y ) winpos->cy = minTrack.y;
	}
    }
    return 0;
}


/***********************************************************************
 *           WINPOS_HandleWindowPosChanging
 *
 * Default handling for a WM_WINDOWPOSCHANGING. Called from DefWindowProc().
 */
LONG WINPOS_HandleWindowPosChanging( HWND hwnd, WINDOWPOS *winpos )
{
    POINT maxSize, minTrack;
    LONG style = GetWindowLongA( hwnd, GWL_STYLE );

    if (winpos->flags & SWP_NOSIZE) return 0;
    if ((style & WS_THICKFRAME) || ((style & (WS_POPUP | WS_CHILD)) == 0))
    {
	WINPOS_GetMinMaxInfo( hwnd, &maxSize, NULL, &minTrack, NULL );
	winpos->cx = min( winpos->cx, maxSize.x );
	winpos->cy = min( winpos->cy, maxSize.y );
	if (!(style & WS_MINIMIZE))
	{
	    if (winpos->cx < minTrack.x ) winpos->cx = minTrack.x;
	    if (winpos->cy < minTrack.y ) winpos->cy = minTrack.y;
	}
    }
    return 0;
}


/***********************************************************************
 *           dump_winpos_flags
 */
static void dump_winpos_flags(UINT flags)
{
    TRACE("flags:");
    if(flags & SWP_NOSIZE) TRACE(" SWP_NOSIZE");
    if(flags & SWP_NOMOVE) TRACE(" SWP_NOMOVE");
    if(flags & SWP_NOZORDER) TRACE(" SWP_NOZORDER");
    if(flags & SWP_NOREDRAW) TRACE(" SWP_NOREDRAW");
    if(flags & SWP_NOACTIVATE) TRACE(" SWP_NOACTIVATE");
    if(flags & SWP_FRAMECHANGED) TRACE(" SWP_FRAMECHANGED");
    if(flags & SWP_SHOWWINDOW) TRACE(" SWP_SHOWWINDOW");
    if(flags & SWP_HIDEWINDOW) TRACE(" SWP_HIDEWINDOW");
    if(flags & SWP_NOCOPYBITS) TRACE(" SWP_NOCOPYBITS");
    if(flags & SWP_NOOWNERZORDER) TRACE(" SWP_NOOWNERZORDER");
    if(flags & SWP_NOSENDCHANGING) TRACE(" SWP_NOSENDCHANGING");
    if(flags & SWP_DEFERERASE) TRACE(" SWP_DEFERERASE");
    if(flags & SWP_ASYNCWINDOWPOS) TRACE(" SWP_ASYNCWINDOWPOS");

#define DUMPED_FLAGS \
    (SWP_NOSIZE | \
    SWP_NOMOVE | \
    SWP_NOZORDER | \
    SWP_NOREDRAW | \
    SWP_NOACTIVATE | \
    SWP_FRAMECHANGED | \
    SWP_SHOWWINDOW | \
    SWP_HIDEWINDOW | \
    SWP_NOCOPYBITS | \
    SWP_NOOWNERZORDER | \
    SWP_NOSENDCHANGING | \
    SWP_DEFERERASE | \
    SWP_ASYNCWINDOWPOS)

    if(flags & ~DUMPED_FLAGS) TRACE(" %08x", flags & ~DUMPED_FLAGS);
    TRACE("\n");
#undef DUMPED_FLAGS
}

/***********************************************************************
 *		SetWindowPos (USER32.@)
 */
BOOL WINAPI SetWindowPos( HWND hwnd, HWND hwndInsertAfter,
                          INT x, INT y, INT cx, INT cy, UINT flags )
{
    WINDOWPOS winpos;

    TRACE("hwnd %p, after %p, %d,%d (%dx%d), flags %08x\n",
          hwnd, hwndInsertAfter, x, y, cx, cy, flags);
    if(TRACE_ON(win)) dump_winpos_flags(flags);

    if (is_broadcast(hwnd))
    {
        SetLastError( ERROR_INVALID_PARAMETER );
        return FALSE;
    }

    winpos.hwnd = WIN_GetFullHandle(hwnd);
    winpos.hwndInsertAfter = WIN_GetFullHandle(hwndInsertAfter);
    winpos.x = x;
    winpos.y = y;
    winpos.cx = cx;
    winpos.cy = cy;
    winpos.flags = flags;
    if (WIN_IsCurrentThread( hwnd )) return USER_Driver.pSetWindowPos( &winpos );
    return SendMessageW( winpos.hwnd, WM_WINE_SETWINDOWPOS, 0, (LPARAM)&winpos );
}


/***********************************************************************
 *		BeginDeferWindowPos (USER32.@)
 */
HDWP WINAPI BeginDeferWindowPos( INT count )
{
    HDWP handle;
    DWP *pDWP;

    if (count < 0)
    {
        SetLastError(ERROR_INVALID_PARAMETER);
        return 0;
    }
    /* Windows allows zero count, in which case it allocates context for 8 moves */
    if (count == 0) count = 8;

    handle = USER_HEAP_ALLOC( sizeof(DWP) + (count-1)*sizeof(WINDOWPOS) );
    if (!handle) return 0;
    pDWP = (DWP *) USER_HEAP_LIN_ADDR( handle );
    pDWP->actualCount    = 0;
    pDWP->suggestedCount = count;
    pDWP->valid          = TRUE;
    pDWP->wMagic         = DWP_MAGIC;
    pDWP->hwndParent     = 0;
    return handle;
}


/***********************************************************************
 *		DeferWindowPos (USER32.@)
 */
HDWP WINAPI DeferWindowPos( HDWP hdwp, HWND hwnd, HWND hwndAfter,
                                INT x, INT y, INT cx, INT cy,
                                UINT flags )
{
    DWP *pDWP;
    int i;
    HDWP newhdwp = hdwp,retvalue;

    hwnd = WIN_GetFullHandle( hwnd );
    if (hwnd == GetDesktopWindow()) return 0;

    if (!(pDWP = USER_HEAP_LIN_ADDR( hdwp ))) return 0;

    USER_Lock();

    for (i = 0; i < pDWP->actualCount; i++)
    {
        if (pDWP->winPos[i].hwnd == hwnd)
        {
              /* Merge with the other changes */
            if (!(flags & SWP_NOZORDER))
            {
                pDWP->winPos[i].hwndInsertAfter = WIN_GetFullHandle(hwndAfter);
            }
            if (!(flags & SWP_NOMOVE))
            {
                pDWP->winPos[i].x = x;
                pDWP->winPos[i].y = y;
            }
            if (!(flags & SWP_NOSIZE))
            {
                pDWP->winPos[i].cx = cx;
                pDWP->winPos[i].cy = cy;
            }
            pDWP->winPos[i].flags &= flags | ~(SWP_NOSIZE | SWP_NOMOVE |
                                               SWP_NOZORDER | SWP_NOREDRAW |
                                               SWP_NOACTIVATE | SWP_NOCOPYBITS|
                                               SWP_NOOWNERZORDER);
            pDWP->winPos[i].flags |= flags & (SWP_SHOWWINDOW | SWP_HIDEWINDOW |
                                              SWP_FRAMECHANGED);
            retvalue = hdwp;
            goto END;
        }
    }
    if (pDWP->actualCount >= pDWP->suggestedCount)
    {
        newhdwp = USER_HEAP_REALLOC( hdwp,
                      sizeof(DWP) + pDWP->suggestedCount*sizeof(WINDOWPOS) );
        if (!newhdwp)
        {
            retvalue = 0;
            goto END;
        }
        pDWP = (DWP *) USER_HEAP_LIN_ADDR( newhdwp );
        pDWP->suggestedCount++;
    }
    pDWP->winPos[pDWP->actualCount].hwnd = hwnd;
    pDWP->winPos[pDWP->actualCount].hwndInsertAfter = hwndAfter;
    pDWP->winPos[pDWP->actualCount].x = x;
    pDWP->winPos[pDWP->actualCount].y = y;
    pDWP->winPos[pDWP->actualCount].cx = cx;
    pDWP->winPos[pDWP->actualCount].cy = cy;
    pDWP->winPos[pDWP->actualCount].flags = flags;
    pDWP->actualCount++;
    retvalue = newhdwp;
END:
    USER_Unlock();
    return retvalue;
}


/***********************************************************************
 *		EndDeferWindowPos (USER32.@)
 */
BOOL WINAPI EndDeferWindowPos( HDWP hdwp )
{
    DWP *pDWP;
    WINDOWPOS *winpos;
    BOOL res = TRUE;
    int i;

    pDWP = (DWP *) USER_HEAP_LIN_ADDR( hdwp );
    if (!pDWP) return FALSE;
    for (i = 0, winpos = pDWP->winPos; i < pDWP->actualCount; i++, winpos++)
    {
        if (!(res = USER_Driver.pSetWindowPos( winpos ))) break;
    }
    USER_HEAP_FREE( hdwp );
    return res;
}


/***********************************************************************
 *		TileChildWindows (USER.199)
 */
void WINAPI TileChildWindows16( HWND16 parent, WORD action )
{
    FIXME("(%04x, %d): stub\n", parent, action);
}

/***********************************************************************
 *		CascadeChildWindows (USER.198)
 */
void WINAPI CascadeChildWindows16( HWND16 parent, WORD action )
{
    FIXME("(%04x, %d): stub\n", parent, action);
}

/***********************************************************************
 *		SetProgmanWindow (USER32.@)
 */
HWND WINAPI SetProgmanWindow ( HWND hwnd )
{
	hGlobalProgmanWindow = hwnd;
	return hGlobalProgmanWindow;
}

/***********************************************************************
 *		GetProgmanWindow (USER32.@)
 */
HWND WINAPI GetProgmanWindow(void)
{
	return hGlobalProgmanWindow;
}

/***********************************************************************
 *		SetShellWindowEx (USER32.@)
 * hwndProgman =  Progman[Program Manager]
 *                |-> SHELLDLL_DefView
 * hwndListView = |   |-> SysListView32
 *                |   |   |-> tooltips_class32
 *                |   |
 *                |   |-> SysHeader32
 *                |
 *                |-> ProxyTarget
 */
HWND WINAPI SetShellWindowEx ( HWND hwndProgman, HWND hwndListView )
{
	FIXME("%p %p stub\n",hwndProgman ,hwndListView );
	hGlobalShellWindow = hwndProgman;
	return hGlobalShellWindow;

}

/***********************************************************************
 *		SetTaskmanWindow (USER32.@)
 * NOTES
 *   hwnd = MSTaskSwWClass
 *          |-> SysTabControl32
 */
HWND WINAPI SetTaskmanWindow ( HWND hwnd )
{
	hGlobalTaskmanWindow = hwnd;
	return hGlobalTaskmanWindow;
}

/***********************************************************************
 *		GetTaskmanWindow (USER32.@)
 */
HWND WINAPI GetTaskmanWindow(void)
{
	return hGlobalTaskmanWindow;
}