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
   9 #include "config.h"
  10
  11 #include "ts_xlib.h"
  12 #include "ts_xutil.h"
  13
  14 #include "winbase.h"
  15 #include "wingdi.h"
  16 #include "winuser.h"
  17
  18 #include "x11drv.h"
  19 #include "win.h"
  20 #include "debugtools.h"
  21
  22 DEFAULT_DEBUG_CHANNEL(x11drv);
  23
  24
  25 /*************************************************************************
  26  *             fix_caret
  27  */
  28 static BOOL fix_caret(HWND hWnd, LPRECT lprc, UINT flags)
  29 {
  30    HWND hCaret = CARET_GetHwnd();
  31
  32    if( hCaret )
  33    {
  34        RECT rc;
  35        CARET_GetRect( &rc );
  36        if( hCaret == hWnd ||
  37           (flags & SW_SCROLLCHILDREN && IsChild(hWnd, hCaret)) )
  38        {
  39            POINT pt;
  40            pt.x = rc.left;
  41            pt.y = rc.top;
  42            MapWindowPoints( hCaret, hWnd, (LPPOINT)&rc, 2 );
  43            if( IntersectRect(lprc, lprc, &rc) )
  44            {
  45                HideCaret(0);
  46                lprc->left = pt.x;
  47                lprc->top = pt.y;
  48                return TRUE;
  49            }
  50        }
  51    }
  52    return FALSE;
  53 }
  54
  55
  56 /*************************************************************************
  57  *              ScrollDC   (X11DRV.@)
  58  *
  59  * Only the hrgnUpdate is returned in device coordinates.
  60  * rcUpdate must be returned in logical coordinates to comply with win API.
  61  * FIXME: the doc explicitly states the opposite, to be checked
  62  */
  63 BOOL X11DRV_ScrollDC( HDC hdc, INT dx, INT dy, const RECT *rc,
  64                       const RECT *clipRect, HRGN hrgnUpdate, LPRECT rcUpdate )
  65 {
  66     RECT rect, rClip, rSrc;
  67
  68     TRACE( "%04x %d,%d hrgnUpdate=%04x rcUpdate = %p\n", hdc, dx, dy, hrgnUpdate, rcUpdate );
  69     if (clipRect) TRACE( "cliprc = (%d,%d,%d,%d)\n",
  70                          clipRect->left, clipRect->top, clipRect->right, clipRect->bottom );
  71     if (rc) TRACE( "rc = (%d,%d,%d,%d)\n", rc->left, rc->top, rc->right, rc->bottom );
  72
  73     /* compute device clipping region (in device coordinates) */
  74
  75     if (rc) rect = *rc;
  76     else GetClipBox( hdc, &rect );
  77
  78     if (clipRect)
  79     {
  80         rClip = *clipRect;
  81         IntersectRect( &rClip, &rect, &rClip );
  82     }
  83     else rClip = rect;
  84
  85     rSrc = rClip;
  86     OffsetRect( &rSrc, -dx, -dy );
  87     IntersectRect( &rSrc, &rSrc, &rect );
  88
  89     if (!IsRectEmpty(&rSrc))
  90     {
  91         /* copy bits */
  92         if (!BitBlt( hdc, rSrc.left + dx, rSrc.top + dy,
  93                      rSrc.right - rSrc.left, rSrc.bottom - rSrc.top,
  94                      hdc, rSrc.left, rSrc.top, SRCCOPY))
  95             return FALSE;
  96     }
  97
  98     /* compute update areas */
  99
 100     if (hrgnUpdate || rcUpdate)
 101     {
 102         HRGN hrgn = hrgnUpdate, hrgn2;
 103         POINT pt;
 104
 105         /* map everything to device coordinates */
 106         pt.x = rect.left + dx;
 107         pt.y = rect.top + dy;
 108         LPtoDP( hdc, &pt, 1 );
 109         LPtoDP( hdc, (LPPOINT)&rect, 2 );
 110         LPtoDP( hdc, (LPPOINT)&rClip, 2 );
 111         dx = pt.x - rect.left;
 112         dy = pt.y - rect.top;
 113
 114         hrgn2 = CreateRectRgnIndirect( &rect );
 115         if (hrgn) SetRectRgn( hrgn, rClip.left, rClip.top, rClip.right, rClip.bottom );
 116         else hrgn = CreateRectRgn( rClip.left, rClip.top, rClip.right, rClip.bottom );
 117         CombineRgn( hrgn, hrgn, hrgn2, RGN_AND );
 118         OffsetRgn( hrgn2, dx, dy );
 119         CombineRgn( hrgn, hrgn, hrgn2, RGN_DIFF );
 120
 121         if( rcUpdate )
 122         {
 123             GetRgnBox( hrgn, rcUpdate );
 124
 125             /* Put the rcUpdate in logical coordinate */
 126             DPtoLP( hdc, (LPPOINT)rcUpdate, 2 );
 127         }
 128         if (!hrgnUpdate) DeleteObject( hrgn );
 129         DeleteObject( hrgn2 );
 130     }
 131     return TRUE;
 132 }
 133
 134
 135 /*************************************************************************
 136  *              ScrollWindowEx   (X11DRV.@)
 137  */
 138 INT X11DRV_ScrollWindowEx( HWND hwnd, INT dx, INT dy,
 139                            const RECT *rect, const RECT *clipRect,
 140                            HRGN hrgnUpdate, LPRECT rcUpdate, UINT flags )
 141 {
 142     INT  retVal = NULLREGION;
 143     BOOL bCaret = FALSE, bOwnRgn = TRUE;
 144     RECT rc, cliprc;
 145     WND*   wnd = WIN_FindWndPtr( hwnd );
 146
 147     if( !wnd || !WIN_IsWindowDrawable( wnd, TRUE ))
 148     {
 149         retVal = ERROR;
 150         goto END;
 151     }
 152     hwnd = wnd->hwndSelf;  /* make it a full handle */
 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 (!IsRectEmpty(&cliprc) && (dx || dy))
 161     {
 162         HDC   hDC;
 163         BOOL  bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
 164         HRGN  hrgnClip = CreateRectRgnIndirect(&cliprc);
 165         HRGN  hrgnTemp;
 166         RECT  caretrc;
 167
 168         TRACE( "%04x, %d,%d hrgnUpdate=%04x rcUpdate = %p rc=(%d,%d-%d,%d) %04x\n",
 169                hwnd, dx, dy, hrgnUpdate, rcUpdate,
 170                rc.left, rc.top, rc.right, rc.bottom, flags );
 171         if (clipRect) TRACE( "cliprc = (%d,%d,%d,%d)\n",
 172                              clipRect->left, clipRect->top,
 173                              clipRect->right, clipRect->bottom );
 174
 175         caretrc = rc;
 176         bCaret = fix_caret(hwnd, &caretrc, flags);
 177
 178         if( hrgnUpdate ) bOwnRgn = FALSE;
 179         else if( bUpdate ) hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
 180
 181         hDC = GetDCEx( hwnd, 0, DCX_CACHE | DCX_USESTYLE );
 182         if (hDC)
 183         {
 184             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 185             X11DRV_StartGraphicsExposures( hDC );
 186             X11DRV_ScrollDC( hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate );
 187             X11DRV_EndGraphicsExposures( hDC, hrgn );
 188             ReleaseDC( hwnd, hDC );
 189             if (bUpdate) CombineRgn( hrgnUpdate, hrgnUpdate, hrgn, RGN_OR );
 190             else RedrawWindow( hwnd, NULL, hrgn, RDW_INVALIDATE | RDW_ERASE );
 191             DeleteObject( hrgn );
 192         }
 193
 194         /* Take into account the fact that some damages may have occured during the scroll */
 195         hrgnTemp = CreateRectRgn( 0, 0, 0, 0 );
 196         if (GetUpdateRgn( hwnd, hrgnTemp, FALSE ) != NULLREGION)
 197         {
 198             OffsetRgn( hrgnTemp, dx, dy );
 199             CombineRgn( hrgnTemp, hrgnTemp, hrgnClip, RGN_AND );
 200             RedrawWindow( hwnd, NULL, hrgnTemp, RDW_INVALIDATE | RDW_ERASE );
 201         }
 202         DeleteObject( hrgnTemp );
 203
 204         if( flags & SW_SCROLLCHILDREN )
 205         {
 206             RECT r;
 207             WND *w;
 208             for( w =WIN_LockWndPtr(wnd->child); w; WIN_UpdateWndPtr(&w, w->next))
 209             {
 210                 r = w->rectWindow;
 211                 if( !rect || IntersectRect(&r, &r, &rc) )
 212                     SetWindowPos(w->hwndSelf, 0, w->rectWindow.left + dx,
 213                                  w->rectWindow.top  + dy, 0,0, SWP_NOZORDER |
 214                                  SWP_NOSIZE | SWP_NOACTIVATE | SWP_NOREDRAW |
 215                                  SWP_DEFERERASE );
 216             }
 217         }
 218
 219         if( flags & (SW_INVALIDATE | SW_ERASE) )
 220             RedrawWindow( hwnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
 221                           ((flags & SW_ERASE) ? RDW_ERASENOW : 0) |
 222                           ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0 ) );
 223
 224         if( bCaret )
 225         {
 226             SetCaretPos( caretrc.left + dx, caretrc.top + dy );
 227             ShowCaret(0);
 228         }
 229
 230         if( bOwnRgn && hrgnUpdate ) DeleteObject( hrgnUpdate );
 231         DeleteObject( hrgnClip );
 232     }
 233 END:
 234     WIN_ReleaseWndPtr(wnd);
 235     return retVal;
 236 }