dlls/x11drv/scroll.c

   1 /*
   2  * Scroll windows and DCs
   3  *
   4  * Copyright 1993  David W. Metcalfe
   5  * Copyright 1995, 1996 Alex Korobka
   6  * Copyright 2001 Alexandre Julliard
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include "config.h"
  24
  25 #include "ts_xlib.h"
  26
  27 #include "winbase.h"
  28 #include "wingdi.h"
  29 #include "winuser.h"
  30
  31 #include "x11drv.h"
  32 #include "win.h"
  33 #include "wine/debug.h"
  34
  35 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
  36
  37
  38 /*************************************************************************
  39  *              ScrollDC   (X11DRV.@)
  40  *
  41  * Only the hrgnUpdate is returned in device coordinates.
  42  * rcUpdate must be returned in logical coordinates to comply with win API.
  43  * FIXME: the doc explicitly states the opposite, to be checked
  44  */
  45 BOOL X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *rc,
  46                       const RECT *clipRect, HRGN hrgnUpdate, LPRECT rcUpdate )
  47 {
  48     RECT rect, rClip, rDst;
  49
  50     TRACE( "%04x %d,%d hrgnUpdate=%04x rcUpdate = %p\n", hdc, dx, dy, hrgnUpdate, rcUpdate );
  51     if (clipRect) TRACE( "cliprc = (%d,%d,%d,%d)\n",
  52                          clipRect->left, clipRect->top, clipRect->right, clipRect->bottom );
  53     if (rc) TRACE( "rc = (%d,%d,%d,%d)\n", rc->left, rc->top, rc->right, rc->bottom );
  54
  55     /* compute device clipping region (in device coordinates) */
  56
  57     if (rc) rect = *rc;
  58     else GetClipBox( hdc, &rect );
  59
  60     if (clipRect)
  61     {
  62         rClip = *clipRect;
  63         IntersectRect( &rClip, &rect, &rClip );
  64     }
  65     else rClip = rect;
  66
  67     rDst = rClip;
  68     OffsetRect( &rDst, dx,  dy );
  69     IntersectRect( &rDst, &rDst, &rClip );
  70
  71     if (!IsRectEmpty(&rDst))
  72     {
  73         /* copy bits */
  74         if (!BitBlt( hdc, rDst.left, rDst.top,
  75                      rDst.right - rDst.left, rDst.bottom - rDst.top,
  76                      hdc, rDst.left - dx, rDst.top - dy, SRCCOPY))
  77             return FALSE;
  78     }
  79
  80     /* compute update areas */
  81
  82     if (hrgnUpdate || rcUpdate)
  83     {
  84         HRGN hrgn = hrgnUpdate, hrgn2;
  85
  86         /* map everything to device coordinates */
  87         LPtoDP( hdc, (LPPOINT)&rClip, 2 );
  88         LPtoDP( hdc, (LPPOINT)&rDst, 2 );
  89
  90         hrgn2 = CreateRectRgnIndirect( &rDst );
  91         if (hrgn) SetRectRgn( hrgn, rClip.left, rClip.top, rClip.right, rClip.bottom );
  92         else hrgn = CreateRectRgn( rClip.left, rClip.top, rClip.right, rClip.bottom );
  93         CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
  94
  95         if( rcUpdate )
  96         {
  97             GetRgnBox( hrgn, rcUpdate );
  98
  99             /* Put the rcUpdate in logical coordinate */
 100             DPtoLP( hdc, (LPPOINT)rcUpdate, 2 );
 101         }
 102         if (!hrgnUpdate) DeleteObject( hrgn );
 103         DeleteObject( hrgn2 );
 104     }
 105     return TRUE;
 106 }
 107
 108
 109 /*************************************************************************
 110  *              ScrollWindowEx   (X11DRV.@)
 111  *
 112  * Note: contrary to what the doc says, pixels that are scrolled from the
 113  *      outside of clipRect to the inside are NOT painted.
 114  *
 115  * Parameter are the same as in ScrollWindowEx, with the additional
 116  * requirement that rect and clipRect are _valid_ pointers, to
 117  * rectangles _within_ the client are. Moreover, there is something
 118  * to scroll.
 119  */
 120 INT X11DRV_ScrollWindowEx( HWND hwnd, INT dx, INT dy,
 121                            const RECT *rect, const RECT *clipRect,
 122                            HRGN hrgnUpdate, LPRECT rcUpdate, UINT flags )
 123 {
 124     INT   retVal;
 125     BOOL  bOwnRgn = TRUE;
 126     BOOL  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
 127     HRGN  hrgnClip = CreateRectRgnIndirect(clipRect);
 128     HRGN  hrgnTemp;
 129     HDC   hDC;
 130
 131     TRACE( "%04x, %d,%d hrgnUpdate=%04x rcUpdate = %p rect=(%d,%d-%d,%d) %04x\n",
 132            hwnd, dx, dy, hrgnUpdate, rcUpdate,
 133            rect->left, rect->top, rect->right, rect->bottom, flags );
 134     TRACE( "clipRect = (%d,%d,%d,%d)\n",
 135            clipRect->left, clipRect->top, clipRect->right, clipRect->bottom );
 136
 137     if( hrgnUpdate ) bOwnRgn = FALSE;
 138     else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
 139
 140     hDC = GetDCEx( hwnd, 0, DCX_CACHE | DCX_USESTYLE );
 141     if (hDC)
 142     {
 143         HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 144         X11DRV_StartGraphicsExposures( hDC );
 145         X11DRV_ScrollDC( hDC, dx, dy, rect, clipRect, hrgnUpdate, rcUpdate );
 146         X11DRV_EndGraphicsExposures( hDC, hrgn );
 147         ReleaseDC( hwnd, hDC );
 148         if (bUpdate) CombineRgn( hrgnUpdate, hrgnUpdate, hrgn, RGN_OR );
 149         else RedrawWindow( hwnd, NULL, hrgn, RDW_INVALIDATE | RDW_ERASE );
 150         DeleteObject( hrgn );
 151     }
 152
 153     /* Take into account the fact that some damages may have occured during the scroll */
 154     hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
 155     retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
 156     if (retVal != NULLREGION)
 157     {
 158         OffsetRgn( hrgnTemp, dx, dy );
 159         CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
 160         RedrawWindow( hwnd, NULL, hrgnTemp, RDW_INVALIDATE | RDW_ERASE );
 161     }
 162     DeleteObject( hrgnTemp );
 163
 164     if( flags & SW_SCROLLCHILDREN )
 165     {
 166         HWND *list = WIN_ListChildren( hwnd );
 167         if (list)
 168         {
 169             int i;
 170             RECT r, dummy;
 171             for (i = 0; list[i]; i++)
 172             {
 173                 GetWindowRect( list[i], &r );
 174                 MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
 175                 if (!rect || IntersectRect(&dummy, &r, rect))
 176                     SetWindowPos( list[i], 0, r.left + dx, r.top  + dy, 0, 0,
 177                                   SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
 178                                   SWP_NOREDRAW | SWP_DEFERERASE );
 179             }
 180             HeapFree( GetProcessHeap(), 0, list );
 181         }
 182     }
 183
 184     if( flags & (SW_INVALIDATE | SW_ERASE) )
 185         RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
 186                       ((flags & SW_ERASE) ? RDW_ERASENOW : 0) |
 187                       ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
 188
 189     if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
 190     DeleteObject( hrgnClip );
 191
 192     return retVal;
 193 }