1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/*
* Copyright (C) 2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FormattingContext.h"
#include "LayoutElementBox.h"
#include "PlacedFloats.h"
#include <wtf/TZoneMalloc.h>
namespace WebCore {
namespace Layout {
class FloatAvoider;
class Box;
// FloatingContext is responsible for adjusting the position of a box in the current formatting context
// by taking the floating boxes into account.
// Note that a FloatingContext's inline direction always matches the root's inline direction but it may
// not match the PlacedFloats's inline direction (i.e. PlacedFloats may be constructed by a parent BFC with mismatching inline direction).
class FloatingContext {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(FloatingContext);
public:
FloatingContext(const ElementBox& formattingContextRoot, const LayoutState&, const PlacedFloats&);
const PlacedFloats& placedFloats() const { return m_placedFloats; }
LayoutPoint positionForFloat(const Box&, const BoxGeometry&, const HorizontalConstraints&) const;
LayoutPoint positionForNonFloatingFloatAvoider(const Box&, const BoxGeometry&) const;
struct BlockAxisPositionWithClearance {
LayoutUnit position;
std::optional<LayoutUnit> clearance;
};
std::optional<BlockAxisPositionWithClearance> blockAxisPositionWithClearance(const Box&, const BoxGeometry&) const;
bool isEmpty() const { return m_placedFloats.list().isEmpty(); }
struct Constraints {
std::optional<PointInContextRoot> start;
std::optional<PointInContextRoot> end;
};
enum class MayBeAboveLastFloat : bool { No, Yes };
Constraints constraints(LayoutUnit candidateTop, LayoutUnit candidateBottom, MayBeAboveLastFloat) const;
PlacedFloats::Item makeFloatItem(const Box& floatBox, const BoxGeometry&, std::optional<size_t> line = { }) const;
bool isStartPositioned(const Box& floatBox) const;
private:
bool isFloatingCandidateStartPositionedInBlockFormattingContext(const Box&) const;
Clear clearInBlockFormattingContext(const Box&) const;
const ElementBox& root() const { return m_formattingContextRoot; }
// FIXME: Turn this into an actual geometry cache.
const LayoutState& containingBlockGeometries() const { return m_layoutState; }
void findPositionForFormattingContextRoot(FloatAvoider&, BoxGeometry::HorizontalEdges containingBlockContentBoxEdges) const;
struct AbsoluteCoordinateValuesForFloatAvoider;
AbsoluteCoordinateValuesForFloatAvoider absoluteCoordinates(const Box&, LayoutPoint borderBoxTopLeft) const;
LayoutPoint mapTopLeftToBlockFormattingContextRoot(const Box&, LayoutPoint borderBoxTopLeft) const;
Point mapPointFromFloatingContextRootToBlockFormattingContextRoot(Point) const;
CheckedRef<const ElementBox> m_formattingContextRoot;
const LayoutState& m_layoutState;
const PlacedFloats& m_placedFloats;
};
}
}
|
