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135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/*
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* Scroll windows and DCs
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*
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* Copyright David W. Metcalfe, 1993
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* Alex Korobka 1995,1996
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdlib.h>
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#include "windef.h"
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#include "wingdi.h"
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#include "wine/winuser16.h"
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#include "winuser.h"
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#include "user.h"
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#include "win.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(scroll);
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/*************************************************************************
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* fix_caret
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*/
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static HWND fix_caret(HWND hWnd, LPRECT lprc, UINT flags)
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{
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GUITHREADINFO info;
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if (!GetGUIThreadInfo( GetCurrentThreadId(), &info )) return 0;
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if (!info.hwndCaret) return 0;
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if (info.hwndCaret == hWnd ||
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((flags & SW_SCROLLCHILDREN) && IsChild(hWnd, info.hwndCaret)))
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{
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POINT pt;
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pt.x = info.rcCaret.left;
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pt.y = info.rcCaret.top;
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MapWindowPoints( info.hwndCaret, hWnd, (LPPOINT)&info.rcCaret, 2 );
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if( IntersectRect(lprc, lprc, &info.rcCaret) )
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{
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HideCaret(0);
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lprc->left = pt.x;
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lprc->top = pt.y;
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return info.hwndCaret;
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}
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}
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return 0;
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}
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/*************************************************************************
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* ScrollWindow (USER32.@)
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*
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*/
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BOOL WINAPI ScrollWindow( HWND hwnd, INT dx, INT dy,
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const RECT *rect, const RECT *clipRect )
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{
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return
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(ERROR != ScrollWindowEx( hwnd, dx, dy, rect, clipRect, 0, NULL,
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(rect ? 0 : SW_SCROLLCHILDREN) |
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SW_INVALIDATE ));
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}
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/*************************************************************************
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* ScrollDC (USER32.@)
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*
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* Only the hrgnUpdate is return in device coordinate.
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* rcUpdate must be returned in logical coordinate to comply with win API.
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*
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*/
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BOOL WINAPI ScrollDC( HDC hdc, INT dx, INT dy, const RECT *rc,
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const RECT *prLClip, HRGN hrgnUpdate,
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LPRECT rcUpdate )
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{
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if (USER_Driver.pScrollDC)
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return USER_Driver.pScrollDC( hdc, dx, dy, rc, prLClip, hrgnUpdate, rcUpdate );
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return FALSE;
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}
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/*************************************************************************
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* ScrollWindowEx (USER32.@)
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*
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* NOTE: Use this function instead of ScrollWindow32
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*/
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INT WINAPI ScrollWindowEx( HWND hwnd, INT dx, INT dy,
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const RECT *rect, const RECT *clipRect,
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HRGN hrgnUpdate, LPRECT rcUpdate,
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UINT flags )
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{
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RECT rc, cliprc;
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INT result;
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if (!WIN_IsWindowDrawable( hwnd, TRUE )) return ERROR;
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hwnd = WIN_GetFullHandle( hwnd );
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GetClientRect(hwnd, &rc);
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if (rect) IntersectRect(&rc, &rc, rect);
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if (clipRect) IntersectRect(&cliprc,&rc,clipRect);
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else cliprc = rc;
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if (!IsRectEmpty(&cliprc) && (dx || dy))
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{
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RECT caretrc = rc;
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HWND hwndCaret = fix_caret(hwnd, &caretrc, flags);
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if (USER_Driver.pScrollWindowEx)
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result = USER_Driver.pScrollWindowEx( hwnd, dx, dy, rect, clipRect,
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hrgnUpdate, rcUpdate, flags );
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else
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result = ERROR; /* FIXME: we should have a fallback implementation */
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if( hwndCaret )
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{
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SetCaretPos( caretrc.left + dx, caretrc.top + dy );
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ShowCaret(hwndCaret);
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}
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}
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else
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result = NULLREGION;
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return result;
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}
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