1/*
2 * Copyright (C) 2018 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#if ENABLE(LAYOUT_FORMATTING_CONTEXT)
29
30#include "FloatingState.h"
31#include "LayoutUnits.h"
32#include <wtf/IsoMalloc.h>
33
34namespace WebCore {
35
36namespace Layout {
37
38class FloatAvoider;
39class Box;
40class Container;
41class FloatingPair;
42class LayoutState;
43
44// FloatingContext is responsible for adjusting the position of a box in the current formatting context
45// by taking the floating boxes into account.
46class FloatingContext {
47 WTF_MAKE_ISO_ALLOCATED(FloatingContext);
48public:
49 FloatingContext(FloatingState&);
50
51 FloatingState& floatingState() const { return m_floatingState; }
52
53 Point positionForFloat(const Box&) const;
54 Optional<Point> positionForFormattingContextRoot(const Box&) const;
55
56 struct ClearancePosition {
57 Optional<Position> position;
58 Optional<LayoutUnit> clearance;
59 };
60 ClearancePosition verticalPositionWithClearance(const Box&) const;
61
62private:
63 LayoutState& layoutState() const { return m_floatingState.layoutState(); }
64
65 void findPositionForFloatBox(FloatBox&) const;
66 void findPositionForFormattingContextRoot(FloatAvoider&) const;
67
68 FloatingState& m_floatingState;
69};
70
71}
72}
73#endif
74