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wine/dlls/user32/painting.c
Anatoly Lyutin e8606d5694 user32: Add comment to a function.
2007-07-20 11:44:47 +02:00

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/*
* Window painting functions
*
* Copyright 1993, 1994, 1995, 2001, 2004 Alexandre Julliard
* Copyright 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <string.h>
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "wine/server.h"
#include "win.h"
#include "user_private.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(win);
/***********************************************************************
* dump_rdw_flags
*/
static void dump_rdw_flags(UINT flags)
{
TRACE("flags:");
if (flags & RDW_INVALIDATE) TRACE(" RDW_INVALIDATE");
if (flags & RDW_INTERNALPAINT) TRACE(" RDW_INTERNALPAINT");
if (flags & RDW_ERASE) TRACE(" RDW_ERASE");
if (flags & RDW_VALIDATE) TRACE(" RDW_VALIDATE");
if (flags & RDW_NOINTERNALPAINT) TRACE(" RDW_NOINTERNALPAINT");
if (flags & RDW_NOERASE) TRACE(" RDW_NOERASE");
if (flags & RDW_NOCHILDREN) TRACE(" RDW_NOCHILDREN");
if (flags & RDW_ALLCHILDREN) TRACE(" RDW_ALLCHILDREN");
if (flags & RDW_UPDATENOW) TRACE(" RDW_UPDATENOW");
if (flags & RDW_ERASENOW) TRACE(" RDW_ERASENOW");
if (flags & RDW_FRAME) TRACE(" RDW_FRAME");
if (flags & RDW_NOFRAME) TRACE(" RDW_NOFRAME");
#define RDW_FLAGS \
(RDW_INVALIDATE | \
RDW_INTERNALPAINT | \
RDW_ERASE | \
RDW_VALIDATE | \
RDW_NOINTERNALPAINT | \
RDW_NOERASE | \
RDW_NOCHILDREN | \
RDW_ALLCHILDREN | \
RDW_UPDATENOW | \
RDW_ERASENOW | \
RDW_FRAME | \
RDW_NOFRAME)
if (flags & ~RDW_FLAGS) TRACE(" %04x", flags & ~RDW_FLAGS);
TRACE("\n");
#undef RDW_FLAGS
}
/***********************************************************************
* get_update_region
*
* Return update region (in screen coordinates) for a window.
*/
static HRGN get_update_region( HWND hwnd, UINT *flags, HWND *child )
{
HRGN hrgn = 0;
NTSTATUS status;
RGNDATA *data;
size_t size = 256;
do
{
if (!(data = HeapAlloc( GetProcessHeap(), 0, sizeof(*data) + size - 1 )))
{
SetLastError( ERROR_OUTOFMEMORY );
return 0;
}
SERVER_START_REQ( get_update_region )
{
req->window = hwnd;
req->from_child = child ? *child : 0;
req->flags = *flags;
wine_server_set_reply( req, data->Buffer, size );
if (!(status = wine_server_call( req )))
{
size_t reply_size = wine_server_reply_size( reply );
data->rdh.dwSize = sizeof(data->rdh);
data->rdh.iType = RDH_RECTANGLES;
data->rdh.nCount = reply_size / sizeof(RECT);
data->rdh.nRgnSize = reply_size;
hrgn = ExtCreateRegion( NULL, size, data );
if (child) *child = reply->child;
*flags = reply->flags;
}
else size = reply->total_size;
}
SERVER_END_REQ;
HeapFree( GetProcessHeap(), 0, data );
} while (status == STATUS_BUFFER_OVERFLOW);
if (status) SetLastError( RtlNtStatusToDosError(status) );
return hrgn;
}
/***********************************************************************
* get_update_flags
*
* Get only the update flags, not the update region.
*/
static BOOL get_update_flags( HWND hwnd, HWND *child, UINT *flags )
{
BOOL ret;
SERVER_START_REQ( get_update_region )
{
req->window = hwnd;
req->from_child = child ? *child : 0;
req->flags = *flags | UPDATE_NOREGION;
if ((ret = !wine_server_call_err( req )))
{
if (child) *child = reply->child;
*flags = reply->flags;
}
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* redraw_window_rects
*
* Redraw part of a window.
*/
static BOOL redraw_window_rects( HWND hwnd, UINT flags, const RECT *rects, UINT count )
{
BOOL ret;
SERVER_START_REQ( redraw_window )
{
req->window = hwnd;
req->flags = flags;
wine_server_add_data( req, rects, count * sizeof(RECT) );
ret = !wine_server_call_err( req );
}
SERVER_END_REQ;
return ret;
}
/***********************************************************************
* send_ncpaint
*
* Send a WM_NCPAINT message if needed, and return the resulting update region (in screen coords).
* Helper for erase_now and BeginPaint.
*/
static HRGN send_ncpaint( HWND hwnd, HWND *child, UINT *flags )
{
HRGN whole_rgn = get_update_region( hwnd, flags, child );
HRGN client_rgn = 0;
if (child) hwnd = *child;
if (whole_rgn)
{
RECT client, update;
INT type;
/* check if update rgn overlaps with nonclient area */
type = GetRgnBox( whole_rgn, &update );
GetClientRect( hwnd, &client );
MapWindowPoints( hwnd, 0, (POINT *)&client, 2 );
if ((*flags & UPDATE_NONCLIENT) ||
update.left < client.left || update.top < client.top ||
update.right > client.right || update.bottom > client.bottom)
{
client_rgn = CreateRectRgnIndirect( &client );
CombineRgn( client_rgn, client_rgn, whole_rgn, RGN_AND );
/* check if update rgn contains complete nonclient area */
if (type == SIMPLEREGION)
{
RECT window;
GetWindowRect( hwnd, &window );
if (EqualRect( &window, &update ))
{
DeleteObject( whole_rgn );
whole_rgn = (HRGN)1;
}
}
}
else
{
client_rgn = whole_rgn;
whole_rgn = 0;
}
if (whole_rgn) /* NOTE: WM_NCPAINT allows wParam to be 1 */
{
if (*flags & UPDATE_NONCLIENT) SendMessageW( hwnd, WM_NCPAINT, (WPARAM)whole_rgn, 0 );
if (whole_rgn > (HRGN)1) DeleteObject( whole_rgn );
}
}
return client_rgn;
}
/***********************************************************************
* send_erase
*
* Send a WM_ERASEBKGND message if needed, and optionally return the DC for painting.
* If a DC is requested, the region is selected into it. In all cases the region is deleted.
* Helper for erase_now and BeginPaint.
*/
static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
RECT *clip_rect, HDC *hdc_ret )
{
BOOL need_erase = FALSE;
HDC hdc = 0;
RECT dummy;
if (!clip_rect) clip_rect = &dummy;
if (hdc_ret || (flags & UPDATE_ERASE))
{
UINT dcx_flags = DCX_INTERSECTRGN | DCX_USESTYLE;
if (IsIconic(hwnd)) dcx_flags |= DCX_WINDOW;
if ((hdc = GetDCEx( hwnd, client_rgn, dcx_flags )))
{
INT type = GetClipBox( hdc, clip_rect );
if (flags & UPDATE_ERASE)
{
/* don't erase if the clip box is empty */
if (type != NULLREGION)
need_erase = !SendMessageW( hwnd, WM_ERASEBKGND, (WPARAM)hdc, 0 );
}
if (!hdc_ret)
{
if (need_erase && hwnd != GetDesktopWindow()) /* FIXME: mark it as needing erase again */
RedrawWindow( hwnd, clip_rect, 0, RDW_INVALIDATE | RDW_ERASE | RDW_NOCHILDREN );
USER_Driver->pReleaseDC( hwnd, hdc, TRUE );
}
}
if (hdc_ret) *hdc_ret = hdc;
}
if (!hdc) DeleteObject( client_rgn );
return need_erase;
}
/***********************************************************************
* erase_now
*
* Implementation of RDW_ERASENOW behavior.
*/
static void erase_now( HWND hwnd, UINT rdw_flags )
{
HWND child = 0;
HRGN hrgn;
/* loop while we find a child to repaint */
for (;;)
{
UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE;
if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
if (!(hrgn = send_ncpaint( hwnd, &child, &flags ))) break;
send_erase( child, flags, hrgn, NULL, NULL );
if (!flags) break; /* nothing more to do */
if (rdw_flags & RDW_NOCHILDREN) break;
}
}
/***********************************************************************
* update_now
*
* Implementation of RDW_UPDATENOW behavior.
*
* FIXME: Windows uses WM_SYNCPAINT to cut down the number of intertask
* SendMessage() calls. This is a comment inside DefWindowProc() source
* from 16-bit SDK:
*
* This message avoids lots of inter-app message traffic
* by switching to the other task and continuing the
* recursion there.
*
* wParam = flags
* LOWORD(lParam) = hrgnClip
* HIWORD(lParam) = hwndSkip (not used; always NULL)
*
*/
static void update_now( HWND hwnd, UINT rdw_flags )
{
HWND child = 0;
/* desktop window never gets WM_PAINT, only WM_ERASEBKGND */
if (hwnd == GetDesktopWindow()) erase_now( hwnd, rdw_flags | RDW_NOCHILDREN );
/* loop while we find a child to repaint */
for (;;)
{
UINT flags = UPDATE_PAINT | UPDATE_INTERNALPAINT;
if (rdw_flags & RDW_NOCHILDREN) flags |= UPDATE_NOCHILDREN;
else if (rdw_flags & RDW_ALLCHILDREN) flags |= UPDATE_ALLCHILDREN;
if (!get_update_flags( hwnd, &child, &flags )) break;
if (!flags) break; /* nothing more to do */
SendMessageW( child, WM_PAINT, 0, 0 );
if (rdw_flags & RDW_NOCHILDREN) break;
}
}
/*************************************************************************
* fix_caret
*
* Helper for ScrollWindowEx:
* If the return value is 0, no special caret handling is necessary.
* Otherwise the return value is the handle of the window that owns the
* caret. Its caret needs to be hidden during the scroll operation and
* moved to new_caret_pos if move_caret is TRUE.
*/
static HWND fix_caret(HWND hWnd, const RECT *scroll_rect, INT dx, INT dy,
UINT flags, LPBOOL move_caret, LPPOINT new_caret_pos)
{
GUITHREADINFO info;
RECT rect, mapped_rcCaret;
BOOL hide_caret = FALSE;
if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
if (!info.hwndCaret) return 0;
if (info.hwndCaret == hWnd)
{
/* Move the caret if it's (partially) in the source rectangle */
if (IntersectRect(&rect, scroll_rect, &info.rcCaret))
{
*move_caret = TRUE;
hide_caret = TRUE;
new_caret_pos->x = info.rcCaret.left + dx;
new_caret_pos->y = info.rcCaret.top + dy;
}
else
{
*move_caret = FALSE;
/* Hide the caret if it's in the destination rectangle */
rect = *scroll_rect;
OffsetRect(&rect, dx, dy);
hide_caret = IntersectRect(&rect, &rect, &info.rcCaret);
}
}
else
{
if ((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret))
{
*move_caret = FALSE;
/* Hide the caret if it's in the source or in the destination
rectangle */
mapped_rcCaret = info.rcCaret;
MapWindowPoints(info.hwndCaret, hWnd, (LPPOINT)&mapped_rcCaret, 2);
if (IntersectRect(&rect, scroll_rect, &mapped_rcCaret))
{
hide_caret = TRUE;
}
else
{
rect = *scroll_rect;
OffsetRect(&rect, dx, dy);
hide_caret = IntersectRect(&rect, &rect, &mapped_rcCaret);
}
}
else
return 0;
}
if (hide_caret)
{
HideCaret(info.hwndCaret);
return info.hwndCaret;
}
else
return 0;
}
/***********************************************************************
* BeginPaint (USER32.@)
*/
HDC WINAPI BeginPaint( HWND hwnd, PAINTSTRUCT *lps )
{
HWND full_handle;
HRGN hrgn;
UINT flags = UPDATE_NONCLIENT | UPDATE_ERASE | UPDATE_PAINT | UPDATE_INTERNALPAINT | UPDATE_NOCHILDREN;
if (!lps) return 0;
if (!(full_handle = WIN_IsCurrentThread( hwnd )))
{
if (IsWindow(hwnd))
FIXME( "window %p belongs to other thread\n", hwnd );
return 0;
}
hwnd = full_handle;
HideCaret( hwnd );
if (!(hrgn = send_ncpaint( hwnd, NULL, &flags ))) return 0;
lps->fErase = send_erase( hwnd, flags, hrgn, &lps->rcPaint, &lps->hdc );
TRACE("hdc = %p box = (%d,%d - %d,%d), fErase = %d\n",
lps->hdc, lps->rcPaint.left, lps->rcPaint.top, lps->rcPaint.right, lps->rcPaint.bottom,
lps->fErase);
return lps->hdc;
}
/***********************************************************************
* EndPaint (USER32.@)
*/
BOOL WINAPI EndPaint( HWND hwnd, const PAINTSTRUCT *lps )
{
if (!lps) return FALSE;
USER_Driver->pReleaseDC( hwnd, lps->hdc, TRUE );
ShowCaret( hwnd );
return TRUE;
}
/***********************************************************************
* GetDCEx (USER32.@)
*/
HDC WINAPI GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
{
if (!hwnd) hwnd = GetDesktopWindow();
else hwnd = WIN_GetFullHandle( hwnd );
return USER_Driver->pGetDCEx( hwnd, hrgnClip, flags );
}
/***********************************************************************
* GetDC (USER32.@)
*
* Get a device context.
*
* RETURNS
* Success: Handle to the device context
* Failure: NULL.
*/
HDC WINAPI GetDC( HWND hwnd )
{
if (!hwnd) return GetDCEx( 0, 0, DCX_CACHE | DCX_WINDOW );
return GetDCEx( hwnd, 0, DCX_USESTYLE );
}
/***********************************************************************
* GetWindowDC (USER32.@)
*/
HDC WINAPI GetWindowDC( HWND hwnd )
{
return GetDCEx( hwnd, 0, DCX_USESTYLE | DCX_WINDOW );
}
/***********************************************************************
* ReleaseDC (USER32.@)
*
* Release a device context.
*
* RETURNS
* Success: Non-zero. Resources used by hdc are released.
* Failure: 0.
*/
INT WINAPI ReleaseDC( HWND hwnd, HDC hdc )
{
return USER_Driver->pReleaseDC( hwnd, hdc, FALSE );
}
/**********************************************************************
* WindowFromDC (USER32.@)
*/
HWND WINAPI WindowFromDC( HDC hDC )
{
return USER_Driver->pWindowFromDC( hDC );
}
/***********************************************************************
* LockWindowUpdate (USER32.@)
*
* Enables or disables painting in the chosen window.
*
* PARAMS
* hwnd [I] handle to a window.
*
* RETURNS
* If successful, returns nonzero value. Otherwise,
* returns 0.
*
* NOTES
* You can lock only one window at a time.
*/
BOOL WINAPI LockWindowUpdate( HWND hwnd )
{
static HWND lockedWnd;
/* This function is fully implemented by the following patch:
*
* http://www.winehq.org/hypermail/wine-patches/2004/01/0142.html
*
* but in order to work properly, it needs the ability to invalidate
* DCEs in other processes when the lock window is changed, which
* isn't possible yet.
* -mike
*/
FIXME("(%p), partial stub!\n",hwnd);
USER_Lock();
if (lockedWnd)
{
if (!hwnd)
{
/* Unlock lockedWnd */
/* FIXME: Do something */
}
else
{
/* Attempted to lock a second window */
/* Return FALSE and do nothing */
USER_Unlock();
return FALSE;
}
}
lockedWnd = hwnd;
USER_Unlock();
return TRUE;
}
/***********************************************************************
* RedrawWindow (USER32.@)
*/
BOOL WINAPI RedrawWindow( HWND hwnd, const RECT *rect, HRGN hrgn, UINT flags )
{
static const RECT empty;
BOOL ret;
if (!hwnd) hwnd = GetDesktopWindow();
if (TRACE_ON(win))
{
if (hrgn)
{
RECT r;
GetRgnBox( hrgn, &r );
TRACE( "%p region %p box %s ", hwnd, hrgn, wine_dbgstr_rect(&r) );
}
else if (rect)
TRACE( "%p rect %s ", hwnd, wine_dbgstr_rect(rect) );
else
TRACE( "%p whole window ", hwnd );
dump_rdw_flags(flags);
}
/* process pending expose events before painting */
if (flags & RDW_UPDATENOW) USER_Driver->pMsgWaitForMultipleObjectsEx( 0, NULL, 0, QS_PAINT, 0 );
if (rect && !hrgn)
{
if (IsRectEmpty( rect )) rect = &empty;
ret = redraw_window_rects( hwnd, flags, rect, 1 );
}
else if (!hrgn)
{
ret = redraw_window_rects( hwnd, flags, NULL, 0 );
}
else /* need to build a list of the region rectangles */
{
DWORD size;
RGNDATA *data = NULL;
if (!(size = GetRegionData( hrgn, 0, NULL ))) return FALSE;
if (!(data = HeapAlloc( GetProcessHeap(), 0, size ))) return FALSE;
GetRegionData( hrgn, size, data );
if (!data->rdh.nCount) /* empty region -> use a single all-zero rectangle */
ret = redraw_window_rects( hwnd, flags, &empty, 1 );
else
ret = redraw_window_rects( hwnd, flags, (const RECT *)data->Buffer, data->rdh.nCount );
HeapFree( GetProcessHeap(), 0, data );
}
if (flags & RDW_UPDATENOW) update_now( hwnd, flags );
else if (flags & RDW_ERASENOW) erase_now( hwnd, flags );
return ret;
}
/***********************************************************************
* UpdateWindow (USER32.@)
*/
BOOL WINAPI UpdateWindow( HWND hwnd )
{
return RedrawWindow( hwnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN );
}
/***********************************************************************
* InvalidateRgn (USER32.@)
*/
BOOL WINAPI InvalidateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
{
if (!hwnd)
{
SetLastError( ERROR_INVALID_WINDOW_HANDLE );
return FALSE;
}
return RedrawWindow(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
}
/***********************************************************************
* InvalidateRect (USER32.@)
*
* MSDN: if hwnd parameter is NULL, InvalidateRect invalidates and redraws
* all windows and sends WM_ERASEBKGND and WM_NCPAINT.
*/
BOOL WINAPI InvalidateRect( HWND hwnd, const RECT *rect, BOOL erase )
{
UINT flags = RDW_INVALIDATE | (erase ? RDW_ERASE : 0);
if (!hwnd)
{
flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
rect = NULL;
}
return RedrawWindow( hwnd, rect, 0, flags );
}
/***********************************************************************
* ValidateRgn (USER32.@)
*/
BOOL WINAPI ValidateRgn( HWND hwnd, HRGN hrgn )
{
if (!hwnd)
{
SetLastError( ERROR_INVALID_WINDOW_HANDLE );
return FALSE;
}
return RedrawWindow( hwnd, NULL, hrgn, RDW_VALIDATE );
}
/***********************************************************************
* ValidateRect (USER32.@)
*
* MSDN: if hwnd parameter is NULL, ValidateRect invalidates and redraws
* all windows and sends WM_ERASEBKGND and WM_NCPAINT.
*/
BOOL WINAPI ValidateRect( HWND hwnd, const RECT *rect )
{
UINT flags = RDW_VALIDATE;
if (!hwnd)
{
flags = RDW_ALLCHILDREN | RDW_INVALIDATE | RDW_FRAME | RDW_ERASE | RDW_ERASENOW;
rect = NULL;
}
return RedrawWindow( hwnd, rect, 0, flags );
}
/***********************************************************************
* GetUpdateRgn (USER32.@)
*/
INT WINAPI GetUpdateRgn( HWND hwnd, HRGN hrgn, BOOL erase )
{
INT retval = ERROR;
UINT flags = UPDATE_NOCHILDREN;
HRGN update_rgn;
if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
if ((update_rgn = send_ncpaint( hwnd, NULL, &flags )))
{
POINT offset;
retval = CombineRgn( hrgn, update_rgn, 0, RGN_COPY );
send_erase( hwnd, flags, update_rgn, NULL, NULL );
/* map region to client coordinates */
offset.x = offset.y = 0;
ScreenToClient( hwnd, &offset );
OffsetRgn( hrgn, offset.x, offset.y );
}
return retval;
}
/***********************************************************************
* GetUpdateRect (USER32.@)
*/
BOOL WINAPI GetUpdateRect( HWND hwnd, LPRECT rect, BOOL erase )
{
UINT flags = UPDATE_NOCHILDREN;
HRGN update_rgn;
if (erase) flags |= UPDATE_NONCLIENT | UPDATE_ERASE;
if (!(update_rgn = send_ncpaint( hwnd, NULL, &flags ))) return FALSE;
if (rect)
{
if (GetRgnBox( update_rgn, rect ) != NULLREGION)
{
HDC hdc = GetDCEx( hwnd, 0, DCX_USESTYLE );
MapWindowPoints( 0, hwnd, (LPPOINT)rect, 2 );
DPtoLP( hdc, (LPPOINT)rect, 2 );
ReleaseDC( hwnd, hdc );
}
}
send_erase( hwnd, flags, update_rgn, NULL, NULL );
/* check if we still have an update region */
flags = UPDATE_PAINT | UPDATE_NOCHILDREN;
return (get_update_flags( hwnd, NULL, &flags ) && (flags & UPDATE_PAINT));
}
/***********************************************************************
* ExcludeUpdateRgn (USER32.@)
*/
INT WINAPI ExcludeUpdateRgn( HDC hdc, HWND hwnd )
{
HRGN update_rgn = CreateRectRgn( 0, 0, 0, 0 );
INT ret = GetUpdateRgn( hwnd, update_rgn, FALSE );
if (ret != ERROR)
{
POINT pt;
GetDCOrgEx( hdc, &pt );
MapWindowPoints( 0, hwnd, &pt, 1 );
OffsetRgn( update_rgn, -pt.x, -pt.y );
ret = ExtSelectClipRgn( hdc, update_rgn, RGN_DIFF );
DeleteObject( update_rgn );
}
return ret;
}
/*************************************************************************
* ScrollWindowEx (USER32.@)
*
* Note: contrary to what the doc says, pixels that are scrolled from the
* outside of clipRect to the inside are NOT painted.
*
*/
INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
const RECT *rect, const RECT *clipRect,
HRGN hrgnUpdate, LPRECT rcUpdate,
UINT flags )
{
INT retVal = NULLREGION;
BOOL bOwnRgn = TRUE;
BOOL bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
int rdw_flags;
HRGN hrgnTemp;
HRGN hrgnWinupd = 0;
HDC hDC;
RECT rc, cliprc;
HWND hwndCaret = NULL;
BOOL moveCaret = FALSE;
POINT newCaretPos;
TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
if( flags & ~( SW_SCROLLCHILDREN | SW_INVALIDATE | SW_ERASE))
FIXME("some flags (%04x) are unhandled\n", flags);
rdw_flags = (flags & SW_ERASE) && (flags & SW_INVALIDATE) ?
RDW_INVALIDATE | RDW_ERASE : RDW_INVALIDATE ;
if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
hwnd = WIN_GetFullHandle( hwnd );
GetClientRect(hwnd, &rc);
if (rect) IntersectRect(&rc, &rc, rect);
if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
else cliprc = rc;
if( hrgnUpdate ) bOwnRgn = FALSE;
else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
newCaretPos.x = newCaretPos.y = 0;
if( !IsRectEmpty(&cliprc) && (dx || dy)) {
DWORD dcxflags = DCX_CACHE;
DWORD style = GetWindowLongW( hwnd, GWL_STYLE );
hwndCaret = fix_caret(hwnd, &rc, dx, dy, flags, &moveCaret, &newCaretPos);
if( style & WS_CLIPSIBLINGS) dcxflags |= DCX_CLIPSIBLINGS;
if( GetClassLongW( hwnd, GCL_STYLE ) & CS_PARENTDC)
dcxflags |= DCX_PARENTCLIP;
if( !(flags & SW_SCROLLCHILDREN) && (style & WS_CLIPCHILDREN))
dcxflags |= DCX_CLIPCHILDREN;
hDC = GetDCEx( hwnd, 0, dcxflags);
if (hDC)
{
ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
ReleaseDC( hwnd, hDC );
if (!bUpdate)
RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags);
}
/* If the windows has an update region, this must be
* scrolled as well. Keep a copy in hrgnWinupd
* to be added to hrngUpdate at the end. */
hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
if (retVal != NULLREGION)
{
HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
if( !bOwnRgn) {
hrgnWinupd = CreateRectRgn( 0, 0, 0, 0);
CombineRgn( hrgnWinupd, hrgnTemp, 0, RGN_COPY);
}
OffsetRgn( hrgnTemp, dx, dy );
CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
if( !bOwnRgn)
CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
RedrawWindow( hwnd, NULL, hrgnTemp, rdw_flags);
/* Catch the case where the scolling amount exceeds the size of the
* original window. This generated a second update area that is the
* location where the original scrolled content would end up.
* This second region is not returned by the ScrollDC and sets
* ScrollWindowEx apart from just a ScrollDC.
*
* This has been verified with testing on windows.
*/
if (abs(dx) > abs(rc.right - rc.left) ||
abs(dy) > abs(rc.bottom - rc.top))
{
SetRectRgn( hrgnTemp, rc.left + dx, rc.top + dy, rc.right+dx, rc.bottom + dy);
CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
CombineRgn( hrgnUpdate, hrgnUpdate, hrgnTemp, RGN_OR );
if( !bOwnRgn)
CombineRgn( hrgnWinupd, hrgnWinupd, hrgnTemp, RGN_OR );
}
DeleteObject( hrgnClip );
}
DeleteObject( hrgnTemp );
} else {
/* nothing was scrolled */
if( !bOwnRgn)
SetRectRgn( hrgnUpdate, 0, 0, 0, 0 );
SetRectEmpty( rcUpdate);
}
if( flags & SW_SCROLLCHILDREN )
{
HWND *list = WIN_ListChildren( hwnd );
if (list)
{
int i;
RECT r, dummy;
for (i = 0; list[i]; i++)
{
GetWindowRect( list[i], &r );
MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
if (!rect || IntersectRect(&dummy, &r, rect))
SetWindowPos( list[i], 0, r.left + dx, r.top + dy, 0, 0,
SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
SWP_NOREDRAW | SWP_DEFERERASE );
}
HeapFree( GetProcessHeap(), 0, list );
}
}
if( flags & (SW_INVALIDATE | SW_ERASE) )
RedrawWindow( hwnd, NULL, hrgnUpdate, rdw_flags |
((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
if( hrgnWinupd) {
CombineRgn( hrgnUpdate, hrgnUpdate, hrgnWinupd, RGN_OR);
DeleteObject( hrgnWinupd);
}
if( hwndCaret ) {
if ( moveCaret ) SetCaretPos( newCaretPos.x, newCaretPos.y );
ShowCaret(hwndCaret);
}
if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
return retVal;
}
/*************************************************************************
* ScrollWindow (USER32.@)
*
*/
BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
const RECT *rect, const RECT *clipRect )
{
return (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
(rect ? 0 : SW_SCROLLCHILDREN) |
SW_INVALIDATE | SW_ERASE ));
}
/*************************************************************************
* ScrollDC (USER32.@)
*
* dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is
* wrong) hrgnUpdate is returned in device coordinates with rcUpdate in
* logical coordinates.
*/
BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
{
return USER_Driver->pScrollDC( hdc, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate );
}
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