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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 <roc+@cs.cmu.edu>
* David Baron <dbaron@fas.harvard.edu>
* Christian Biesinger <cbiesinger@web.de>
* Randall Jesup <rjesup@wgate.com>
* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
* Josh Soref <timeless@mac.com>
* Boris Zbarsky <bzbarsky@mit.edu>
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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
* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
* (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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLL_ALIGNMENT_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLL_ALIGNMENT_H_
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/scroll/scroll_types.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
enum ScrollAlignmentBehavior {
kScrollAlignmentNoScroll,
kScrollAlignmentCenter,
kScrollAlignmentTop,
kScrollAlignmentBottom,
kScrollAlignmentLeft,
kScrollAlignmentRight,
kScrollAlignmentClosestEdge
};
class LayoutRect;
struct PLATFORM_EXPORT ScrollAlignment {
STACK_ALLOCATED();
public:
static ScrollAlignmentBehavior GetVisibleBehavior(const ScrollAlignment& s) {
return s.rect_visible_;
}
static ScrollAlignmentBehavior GetPartialBehavior(const ScrollAlignment& s) {
return s.rect_partial_;
}
static ScrollAlignmentBehavior GetHiddenBehavior(const ScrollAlignment& s) {
return s.rect_hidden_;
}
// Returns the scroll offset the scroller needs to scroll to in order to put
// |expose_rect| into |visible_scroll_snapport_rect| aligned by |align_x| and
// |align_y|.
// The coordinates for |visible_scroll_snapport_rect|, |expose_rect| and
// |current_scroll_position| are based on the scroller's scroll_origin
// Note that the |current_scroll_offset| is not the location of
// |visible_scroll_snapport_rect|, as |visible_scroll_snapport_rect| is the
// visible rect contracted by its scroll-padding.
// FIXME: This function should probably go somewhere else but where?
static ScrollOffset GetScrollOffsetToExpose(
const LayoutRect& visible_scroll_snapport_rect,
const LayoutRect& expose_rect,
const ScrollAlignment& align_x,
const ScrollAlignment& align_y,
const ScrollOffset& current_scroll_offset);
static const ScrollAlignment kAlignCenterIfNeeded;
static const ScrollAlignment kAlignToEdgeIfNeeded;
static const ScrollAlignment kAlignCenterAlways;
static const ScrollAlignment kAlignTopAlways;
static const ScrollAlignment kAlignBottomAlways;
static const ScrollAlignment kAlignLeftAlways;
static const ScrollAlignment kAlignRightAlways;
ScrollAlignmentBehavior rect_visible_;
ScrollAlignmentBehavior rect_hidden_;
ScrollAlignmentBehavior rect_partial_;
};
inline bool PLATFORM_EXPORT operator==(const ScrollAlignment& lhs,
const ScrollAlignment& rhs) {
return lhs.rect_visible_ == rhs.rect_visible_ &&
lhs.rect_hidden_ == rhs.rect_hidden_ &&
lhs.rect_partial_ == rhs.rect_partial_;
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLL_ALIGNMENT_H_
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