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 <stdarg.h>
  26 #include <X11/Xlib.h>
  27
  28 #include "windef.h"
  29 #include "winbase.h"
  30 #include "wingdi.h"
  31 #include "winuser.h"
  32
  33 #include "x11drv.h"
  34 #include "win.h"
  35 #include "wine/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
  38
  39
  40 /*************************************************************************
  41  *              ScrollDC   (X11DRV.@)
  42  *
  43  * dx, dy, lprcScroll and lprcClip are all in logical coordinates (msdn is wrong)
  44  * hrgnUpdate is returned in device coordinates with rcUpdate in logical coordinates.
  45  *
  46  */
  47 BOOL X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *lprcScroll,
  48                       const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate )
  49 {
  50     RECT rSrc, rClipped_src, rClip, rDst, offset;
  51
  52     TRACE( "%p %d,%d hrgnUpdate=%p lprcUpdate = %p\n", hdc, dx, dy, hrgnUpdate, lprcUpdate );
  53     if (lprcClip) TRACE( "lprcClip = %s\n", wine_dbgstr_rect(lprcClip));
  54     if (lprcScroll) TRACE( "lprcScroll = %s\n", wine_dbgstr_rect(lprcScroll));
  55
  56     /* compute device clipping region (in device coordinates) */
  57
  58     if (lprcScroll) rSrc = *lprcScroll;
  59     else GetClipBox( hdc, &rSrc );
  60     LPtoDP(hdc, (LPPOINT)&rSrc, 2);
  61
  62     if (lprcClip) rClip = *lprcClip;
  63     else GetClipBox( hdc, &rClip );
  64     LPtoDP(hdc, (LPPOINT)&rClip, 2);
  65
  66     IntersectRect( &rClipped_src, &rSrc, &rClip );
  67     TRACE("rSrc %s rClip %s clipped rSrc %s\n", wine_dbgstr_rect(&rSrc),
  68           wine_dbgstr_rect(&rClip), wine_dbgstr_rect(&rClipped_src));
  69
  70     rDst = rClipped_src;
  71     SetRect(&offset, 0, 0, dx, dy);
  72     LPtoDP(hdc, (LPPOINT)&offset, 2);
  73     OffsetRect( &rDst, offset.right - offset.left,  offset.bottom - offset.top );
  74     TRACE("rDst before clipping %s\n", wine_dbgstr_rect(&rDst));
  75     IntersectRect( &rDst, &rDst, &rClip );
  76     TRACE("rDst after clipping %s\n", wine_dbgstr_rect(&rDst));
  77
  78     if (!IsRectEmpty(&rDst))
  79     {
  80         /* copy bits */
  81         RECT rDst_lp = rDst, rSrc_lp = rDst;
  82
  83         OffsetRect( &rSrc_lp, offset.left - offset.right, offset.top - offset.bottom );
  84         DPtoLP(hdc, (LPPOINT)&rDst_lp, 2);
  85         DPtoLP(hdc, (LPPOINT)&rSrc_lp, 2);
  86
  87         if (!BitBlt( hdc, rDst_lp.left, rDst_lp.top,
  88                      rDst_lp.right - rDst_lp.left, rDst_lp.bottom - rDst_lp.top,
  89                      hdc, rSrc_lp.left, rSrc_lp.top, SRCCOPY))
  90             return FALSE;
  91     }
  92
  93     /* compute update areas.  This is the clipped source or'ed with the unclipped source translated minus the
  94      clipped src translated (rDst) all clipped to rClip */
  95
  96     if (hrgnUpdate || lprcUpdate)
  97     {
  98         HRGN hrgn = hrgnUpdate, hrgn2;
  99
 100         if (hrgn) SetRectRgn( hrgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
 101         else hrgn = CreateRectRgn( rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom );
 102
 103         hrgn2 = CreateRectRgnIndirect( &rSrc );
 104         OffsetRgn(hrgn2, offset.right - offset.left,  offset.bottom - offset.top );
 105         CombineRgn(hrgn, hrgn, hrgn2, RGN_OR);
 106
 107         SetRectRgn( hrgn2, rDst.left, rDst.top, rDst.right, rDst.bottom );
 108         CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
 109
 110         SetRectRgn( hrgn2, rClip.left, rClip.top, rClip.right, rClip.bottom );
 111         CombineRgn( hrgn, hrgn, hrgn2, RGN_AND );
 112
 113         if( lprcUpdate )
 114         {
 115             GetRgnBox( hrgn, lprcUpdate );
 116
 117             /* Put the lprcUpdate in logical coordinate */
 118             DPtoLP( hdc, (LPPOINT)lprcUpdate, 2 );
 119             TRACE("returning lprcUpdate %s\n", wine_dbgstr_rect(lprcUpdate));
 120         }
 121         if (!hrgnUpdate) DeleteObject( hrgn );
 122         DeleteObject( hrgn2 );
 123     }
 124     return TRUE;
 125 }
 126
 127
 128 /*************************************************************************
 129  *              ScrollWindowEx   (X11DRV.@)
 130  *
 131  * Note: contrary to what the doc says, pixels that are scrolled from the
 132  *      outside of clipRect to the inside are NOT painted.
 133  *
 134  * Parameter are the same as in ScrollWindowEx, with the additional
 135  * requirement that rect and clipRect are _valid_ pointers, to
 136  * rectangles _within_ the client are. Moreover, there is something
 137  * to scroll.
 138  */
 139 INT X11DRV_ScrollWindowEx( HWND hwnd, INT dx, INT dy,
 140                            const RECT *rect, const RECT *clipRect,
 141                            HRGN hrgnUpdate, LPRECT rcUpdate, UINT flags )
 142 {
 143     INT   retVal;
 144     BOOL  bOwnRgn = TRUE;
 145     BOOL  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
 146     HRGN  hrgnTemp;
 147     HDC   hDC;
 148     RECT  rc, cliprc;
 149
 150     TRACE( "%p, %d,%d hrgnUpdate=%p rcUpdate = %p %s %04x\n",
 151            hwnd, dx, dy, hrgnUpdate, rcUpdate, wine_dbgstr_rect(rect), flags );
 152     TRACE( "clipRect = %s\n", wine_dbgstr_rect(clipRect));
 153
 154     GetClientRect(hwnd, &rc);
 155     if (rect) IntersectRect(&rc, &rc, rect);
 156
 157     if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
 158     else cliprc = rc;
 159
 160     if( hrgnUpdate ) bOwnRgn = FALSE;
 161     else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
 162
 163     hDC = GetDCEx( hwnd, 0, DCX_CACHE | DCX_USESTYLE );
 164     if (hDC)
 165     {
 166         HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 167         X11DRV_StartGraphicsExposures( hDC );
 168         X11DRV_ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
 169         X11DRV_EndGraphicsExposures( hDC, hrgn );
 170         ReleaseDC( hwnd, hDC );
 171         if (bUpdate) CombineRgn( hrgnUpdate, hrgnUpdate, hrgn, RGN_OR );
 172         else RedrawWindow( hwnd, NULL, hrgn, RDW_INVALIDATE | RDW_ERASE );
 173         DeleteObject( hrgn );
 174     }
 175
 176     /* Take into account the fact that some damage may have occurred during the scroll */
 177     hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
 178     retVal = GetUpdateRgn( hwnd, hrgnTemp, FALSE );
 179     if (retVal != NULLREGION)
 180     {
 181         HRGN hrgnClip = CreateRectRgnIndirect(&cliprc);
 182         OffsetRgn( hrgnTemp, dx, dy );
 183         CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
 184         RedrawWindow( hwnd, NULL, hrgnTemp, RDW_INVALIDATE | RDW_ERASE );
 185         DeleteObject( hrgnClip );
 186     }
 187     DeleteObject( hrgnTemp );
 188
 189     if( flags & SW_SCROLLCHILDREN )
 190     {
 191         HWND *list = WIN_ListChildren( hwnd );
 192         if (list)
 193         {
 194             int i;
 195             RECT r, dummy;
 196             for (i = 0; list[i]; i++)
 197             {
 198                 GetWindowRect( list[i], &r );
 199                 MapWindowPoints( 0, hwnd, (POINT *)&r, 2 );
 200                 if (!rect || IntersectRect(&dummy, &r, &rc))
 201                     SetWindowPos( list[i], 0, r.left + dx, r.top  + dy, 0, 0,
 202                                   SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
 203                                   SWP_NOREDRAW | SWP_DEFERERASE );
 204             }
 205             HeapFree( GetProcessHeap(), 0, list );
 206         }
 207     }
 208
 209     if( flags & (SW_INVALIDATE | SW_ERASE) )
 210         RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
 211                       ((flags & SW_ERASE) ? RDW_ERASENOW : 0) |
 212                       ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
 213
 214     if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
 215
 216     return retVal;
 217 }