windows/scroll.c

   1 /*
   2  * Scroll windows and DCs
   3  *
   4  * Copyright  David W. Metcalfe, 1993
   5  *            Alex Korobka       1995,1996
   6  *
   7  *
   8  */
   9
  10 #include <stdlib.h>
  11
  12 #include "windef.h"
  13 #include "wingdi.h"
  14 #include "wine/winuser16.h"
  15 #include "winuser.h"
  16 #include "user.h"
  17 #include "debugtools.h"
  18
  19 DEFAULT_DEBUG_CHANNEL(scroll);
  20
  21 /*************************************************************************
  22  *              ScrollWindow (USER32.@)
  23  *
  24  */
  25 BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
  26                               const RECT *rect, const RECT *clipRect )
  27 {
  28     return
  29         (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
  30                                     (rect ? 0 : SW_SCROLLCHILDREN) |
  31                                     SW_INVALIDATE ));
  32 }
  33
  34 /*************************************************************************
  35  *              ScrollDC (USER.221)
  36  */
  37 BOOL16 WINAPI ScrollDC16( HDC16 hdc, INT16 dx, INT16 dy, const RECT16 *rect,
  38                           const RECT16 *cliprc, HRGN16 hrgnUpdate,
  39                           LPRECT16 rcUpdate )
  40 {
  41     RECT rect32, clipRect32, rcUpdate32;
  42     BOOL16 ret;
  43
  44     if (rect) CONV_RECT16TO32( rect, &rect32 );
  45     if (cliprc) CONV_RECT16TO32( cliprc, &clipRect32 );
  46     ret = ScrollDC( hdc, dx, dy, rect ? &rect32 : NULL,
  47                       cliprc ? &clipRect32 : NULL, hrgnUpdate, &rcUpdate32 );
  48     if (rcUpdate) CONV_RECT32TO16( &rcUpdate32, rcUpdate );
  49     return ret;
  50 }
  51
  52
  53 /*************************************************************************
  54  *              ScrollDC (USER32.@)
  55  *
  56  *   Only the hrgnUpdate is return in device coordinate.
  57  *   rcUpdate must be returned in logical coordinate to comply with win API.
  58  *
  59  */
  60 BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *rc,
  61                           const RECT *prLClip, HRGN hrgnUpdate,
  62                           LPRECT rcUpdate )
  63 {
  64     if (USER_Driver.pScrollDC)
  65         return USER_Driver.pScrollDC( hdc, dx, dy, rc, prLClip, hrgnUpdate, rcUpdate );
  66     return FALSE;
  67 }
  68
  69
  70 /*************************************************************************
  71  *              ScrollWindowEx (USER32.@)
  72  *
  73  * NOTE: Use this function instead of ScrollWindow32
  74  */
  75 INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
  76                                const RECT *rect, const RECT *clipRect,
  77                                HRGN hrgnUpdate, LPRECT rcUpdate,
  78                                UINT flags )
  79 {
  80     if (USER_Driver.pScrollWindowEx)
  81         return USER_Driver.pScrollWindowEx( hwnd, dx, dy, rect, clipRect,
  82                                             hrgnUpdate, rcUpdate, flags );
  83     return ERROR;
  84 }