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      1 /*
      2  * Copyright (C) 2003, 2009 Apple Inc.  All rights reserved.
      3  *
      4  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
      5  *
      6  * Other contributors:
      7  *   Robert O'Callahan <roc+@cs.cmu.edu>
      8  *   David Baron <dbaron (at) fas.harvard.edu>
      9  *   Christian Biesinger <cbiesinger (at) web.de>
     10  *   Randall Jesup <rjesup (at) wgate.com>
     11  *   Roland Mainz <roland.mainz (at) informatik.med.uni-giessen.de>
     12  *   Josh Soref <timeless (at) mac.com>
     13  *   Boris Zbarsky <bzbarsky (at) mit.edu>
     14  *
     15  * This library is free software; you can redistribute it and/or
     16  * modify it under the terms of the GNU Lesser General Public
     17  * License as published by the Free Software Foundation; either
     18  * version 2.1 of the License, or (at your option) any later version.
     19  *
     20  * This library is distributed in the hope that it will be useful,
     21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     23  * Lesser General Public License for more details.
     24  *
     25  * You should have received a copy of the GNU Lesser General Public
     26  * License along with this library; if not, write to the Free Software
     27  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
     28  *
     29  * Alternatively, the contents of this file may be used under the terms
     30  * of either the Mozilla Public License Version 1.1, found at
     31  * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
     32  * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
     33  * (the "GPL"), in which case the provisions of the MPL or the GPL are
     34  * applicable instead of those above.  If you wish to allow use of your
     35  * version of this file only under the terms of one of those two
     36  * licenses (the MPL or the GPL) and not to allow others to use your
     37  * version of this file under the LGPL, indicate your decision by
     38  * deletingthe provisions above and replace them with the notice and
     39  * other provisions required by the MPL or the GPL, as the case may be.
     40  * If you do not delete the provisions above, a recipient may use your
     41  * version of this file under any of the LGPL, the MPL or the GPL.
     42  */
     43 
     44 #ifndef ScrollBehavior_h
     45 #define ScrollBehavior_h
     46 
     47 namespace WebCore {
     48 
     49 enum ScrollBehavior {
     50     noScroll,
     51     alignCenter,
     52     alignTop,
     53     alignBottom,
     54     alignLeft,
     55     alignRight,
     56     alignToClosestEdge
     57 };
     58 
     59 struct ScrollAlignment {
     60     static ScrollBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
     61     static ScrollBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
     62     static ScrollBehavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; }
     63 
     64     static const ScrollAlignment alignCenterIfNeeded;
     65     static const ScrollAlignment alignToEdgeIfNeeded;
     66     static const ScrollAlignment alignCenterAlways;
     67     static const ScrollAlignment alignTopAlways;
     68     static const ScrollAlignment alignBottomAlways;
     69 
     70     ScrollBehavior m_rectVisible;
     71     ScrollBehavior m_rectHidden;
     72     ScrollBehavior m_rectPartial;
     73 };
     74 
     75 
     76 }; // namespace WebCore
     77 
     78 #endif // ScrollBehavior_h
     79