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* Copyright (C) 2003, 2009 Apple Inc. All rights reserved.
* Portions are Copyright (C) 1998 Netscape Communications Corporation.
* Other contributors:
* Robert O'Callahan <>
* David Baron <>
* Christian Biesinger <>
* Randall Jesup <>
* Roland Mainz <>
* Josh Soref <>
* Boris Zbarsky <>
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Alternatively, the contents of this file may be used under the terms
* of either the Mozilla Public License Version 1.1, found at
* (the "MPL") or the GNU General Public
* License Version 2.0, found at
* (the "GPL"), in which case the provisions of the MPL or the GPL are
* applicable instead of those above. If you wish to allow use of your
* version of this file only under the terms of one of those two
* licenses (the MPL or the GPL) and not to allow others to use your
* version of this file under the LGPL, indicate your decision by
* deletingthe provisions above and replace them with the notice and
* other provisions required by the MPL or the GPL, as the case may be.
* If you do not delete the provisions above, a recipient may use your
* version of this file under any of the LGPL, the MPL or the GPL.
#ifndef ScrollBehavior_h
#define ScrollBehavior_h
namespace WebCore {
enum ScrollBehavior {
class LayoutRect;
struct ScrollAlignment {
static ScrollBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
static ScrollBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
static ScrollBehavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; }
// FIXME: This function should probably go somewhere else but where?
static LayoutRect getRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
static const ScrollAlignment alignCenterIfNeeded;
static const ScrollAlignment alignToEdgeIfNeeded;
static const ScrollAlignment alignCenterAlways;
static const ScrollAlignment alignTopAlways;
static const ScrollAlignment alignBottomAlways;
ScrollBehavior m_rectVisible;
ScrollBehavior m_rectHidden;
ScrollBehavior m_rectPartial;
}; // namespace WebCore
#endif // ScrollBehavior_h