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