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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@fas.harvard.edu>
9  *   Christian Biesinger <cbiesinger@web.de>
10  *   Randall Jesup <rjesup@wgate.com>
11  *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
12  *   Josh Soref <timeless@mac.com>
13  *   Boris Zbarsky <bzbarsky@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 {
getVisibleBehaviorScrollAlignment60     static ScrollBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
getPartialBehaviorScrollAlignment61     static ScrollBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
getHiddenBehaviorScrollAlignment62     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