2 * Scroll windows and DCs
4 * Copyright David W. Metcalfe, 1993
5 * Alex Korobka 1995,1996
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 #include "wine/winuser16.h"
30 #include "wine/debug.h"
32 WINE_DEFAULT_DEBUG_CHANNEL(scroll);
34 /*************************************************************************
37 static HWND fix_caret(HWND hWnd, LPRECT lprc, UINT flags)
41 if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
42 if (!info.hwndCaret) return 0;
43 if (info.hwndCaret == hWnd ||
44 ((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret)))
47 pt.x = info.rcCaret.left;
48 pt.y = info.rcCaret.top;
49 MapWindowPoints( info.hwndCaret, hWnd, (LPPOINT)&info.rcCaret, 2 );
50 if( IntersectRect(lprc, lprc, &info.rcCaret) )
55 return info.hwndCaret;
62 /*************************************************************************
63 * ScrollWindow (USER32.@)
66 BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
67 const RECT *rect, const RECT *clipRect )
70 (ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
71 (rect ? 0 : SW_SCROLLCHILDREN) |
75 /*************************************************************************
78 BOOL16 WINAPI ScrollDC16( HDC16 hdc, INT16 dx, INT16 dy, const RECT16 *rect,
79 const RECT16 *cliprc, HRGN16 hrgnUpdate,
82 RECT rect32, clipRect32, rcUpdate32;
85 if (rect) CONV_RECT16TO32( rect, &rect32 );
86 if (cliprc) CONV_RECT16TO32( cliprc, &clipRect32 );
87 ret = ScrollDC( hdc, dx, dy, rect ? &rect32 : NULL,
88 cliprc ? &clipRect32 : NULL, hrgnUpdate, &rcUpdate32 );
89 if (rcUpdate) CONV_RECT32TO16( &rcUpdate32, rcUpdate );
94 /*************************************************************************
97 * Only the hrgnUpdate is return in device coordinate.
98 * rcUpdate must be returned in logical coordinate to comply with win API.
101 BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *rc,
102 const RECT *prLClip, HRGN hrgnUpdate,
105 if (USER_Driver.pScrollDC)
106 return USER_Driver.pScrollDC( hdc, dx, dy, rc, prLClip, hrgnUpdate, rcUpdate );
111 /*************************************************************************
112 * ScrollWindowEx (USER32.@)
114 * NOTE: Use this function instead of ScrollWindow32
116 INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
117 const RECT *rect, const RECT *clipRect,
118 HRGN hrgnUpdate, LPRECT rcUpdate,
124 if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
125 hwnd = WIN_GetFullHandle( hwnd );
127 GetClientRect(hwnd, &rc);
128 if (rect) IntersectRect(&rc, &rc, rect);
130 if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
133 if (!IsRectEmpty(&cliprc) && (dx || dy))
136 HWND hwndCaret = fix_caret(hwnd, &caretrc, flags);
138 if (USER_Driver.pScrollWindowEx)
139 result = USER_Driver.pScrollWindowEx( hwnd, dx, dy, &rc, &cliprc,
140 hrgnUpdate, rcUpdate, flags );
142 result = ERROR; /* FIXME: we should have a fallback implementation */
146 SetCaretPos( caretrc.left + dx, caretrc.top + dy );
147 ShowCaret(hwndCaret);