1/*
2 * Copyright (C) 2003, 2009, 2016 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#pragma once
45
46namespace WTF {
47class TextStream;
48}
49
50namespace WebCore {
51
52struct ScrollAlignment {
53
54 enum class Behavior {
55 NoScroll,
56 AlignCenter,
57 AlignTop,
58 AlignBottom,
59 AlignLeft,
60 AlignRight,
61 AlignToClosestEdge
62 };
63
64 static Behavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
65 static Behavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
66 static Behavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; }
67
68 static const ScrollAlignment alignCenterIfNotVisible;
69 static const ScrollAlignment alignToEdgeIfNotVisible;
70 static const ScrollAlignment alignCenterIfNeeded;
71 WEBCORE_EXPORT static const ScrollAlignment alignToEdgeIfNeeded;
72 WEBCORE_EXPORT static const ScrollAlignment alignCenterAlways;
73 static const ScrollAlignment alignTopAlways;
74 static const ScrollAlignment alignRightAlways;
75 static const ScrollAlignment alignLeftAlways;
76 static const ScrollAlignment alignBottomAlways;
77
78 Behavior m_rectVisible;
79 Behavior m_rectHidden;
80 Behavior m_rectPartial;
81};
82
83WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, ScrollAlignment::Behavior);
84WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const ScrollAlignment&);
85
86}; // namespace WebCore
87