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 "DisplayBox.h"
31#include "LayoutBox.h"
32#include "LayoutUnit.h"
33#include <wtf/IsoMalloc.h>
34#include <wtf/WeakPtr.h>
35
36namespace WebCore {
37
38namespace Layout {
39
40class FloatingState;
41class LayoutState;
42
43class FloatAvoider {
44 WTF_MAKE_ISO_ALLOCATED(FloatAvoider);
45public:
46 FloatAvoider(const Box&, const FloatingState&, const LayoutState&);
47 virtual ~FloatAvoider() = default;
48
49 virtual Display::Box::Rect rect() const { return m_absoluteDisplayBox.rect(); }
50 Display::Box::Rect rectInContainingBlock() const;
51
52 struct HorizontalConstraints {
53 Optional<PositionInContextRoot> left;
54 Optional<PositionInContextRoot> right;
55 };
56 void setHorizontalConstraints(HorizontalConstraints);
57 void setVerticalConstraint(PositionInContextRoot);
58
59 bool overflowsContainingBlock() const;
60
61protected:
62 virtual bool isLeftAligned() const { return layoutBox().style().isLeftToRightDirection(); }
63 PositionInContextRoot initialHorizontalPosition() const;
64
65 void resetHorizontalConstraints();
66
67 virtual PositionInContextRoot horizontalPositionCandidate(HorizontalConstraints);
68 virtual PositionInContextRoot verticalPositionCandidate(PositionInContextRoot);
69
70 LayoutUnit marginBefore() const { return displayBox().marginBefore(); }
71 LayoutUnit marginAfter() const { return displayBox().marginAfter(); }
72 // Do not use the used values here because they computed as if this box was not a float avoider.
73 LayoutUnit marginStart() const { return displayBox().computedMarginStart().valueOr(0); }
74 LayoutUnit marginEnd() const { return displayBox().computedMarginEnd().valueOr(0); }
75
76 LayoutUnit marginBoxWidth() const { return marginStart() + displayBox().width() + marginEnd(); }
77
78 const FloatingState& floatingState() const { return m_floatingState; }
79 const Box& layoutBox() const { return *m_layoutBox; }
80 const Display::Box& displayBox() const { return m_absoluteDisplayBox; }
81 Display::Box& displayBox() { return m_absoluteDisplayBox; }
82
83private:
84 WeakPtr<const Box> m_layoutBox;
85 const FloatingState& m_floatingState;
86 Display::Box m_absoluteDisplayBox;
87 Display::Box m_containingBlockAbsoluteDisplayBox;
88};
89
90}
91}
92#endif
93