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 <wtf/IsoMalloc.h>
32#include <wtf/WeakPtr.h>
33
34namespace WebCore {
35
36class LayoutPoint;
37class LayoutUnit;
38
39namespace Layout {
40
41class Box;
42class Container;
43class FormattingState;
44class LayoutState;
45
46class FormattingContext {
47 WTF_MAKE_ISO_ALLOCATED(FormattingContext);
48public:
49 FormattingContext(const Box& formattingContextRoot, FormattingState&);
50 virtual ~FormattingContext();
51
52 virtual void layout() const = 0;
53 void layoutOutOfFlowDescendants(const Box&) const;
54
55 struct IntrinsicWidthConstraints {
56 LayoutUnit minimum;
57 LayoutUnit maximum;
58 };
59 virtual void computeIntrinsicWidthConstraints() const = 0;
60
61 static Display::Box mapBoxToAncestor(const LayoutState&, const Box&, const Container& ancestor);
62 static LayoutUnit mapTopToAncestor(const LayoutState&, const Box&, const Container& ancestor);
63 static Point mapCoordinateToAncestor(const LayoutState&, Point, const Container& containingBlock, const Container& ancestor);
64
65protected:
66 using LayoutQueue = Vector<const Box*>;
67
68 LayoutState& layoutState() const;
69 FormattingState& formattingState() const { return m_formattingState; }
70 const Box& root() const { return *m_root; }
71
72 void computeBorderAndPadding(const Box&, Optional<UsedHorizontalValues> = WTF::nullopt) const;
73
74#ifndef NDEBUG
75 virtual void validateGeometryConstraintsAfterLayout() const;
76#endif
77
78 // This class implements generic positioning and sizing.
79 class Geometry {
80 public:
81 static VerticalGeometry outOfFlowVerticalGeometry(const LayoutState&, const Box&, UsedVerticalValues);
82 static HorizontalGeometry outOfFlowHorizontalGeometry(LayoutState&, const Box&, UsedHorizontalValues);
83
84 static HeightAndMargin floatingHeightAndMargin(const LayoutState&, const Box&, UsedVerticalValues, UsedHorizontalValues);
85 static WidthAndMargin floatingWidthAndMargin(LayoutState&, const Box&, UsedHorizontalValues);
86
87 static HeightAndMargin inlineReplacedHeightAndMargin(const LayoutState&, const Box&, UsedVerticalValues);
88 static WidthAndMargin inlineReplacedWidthAndMargin(const LayoutState&, const Box&, UsedHorizontalValues);
89
90 static LayoutSize inFlowPositionedPositionOffset(const LayoutState&, const Box&);
91
92 static HeightAndMargin complicatedCases(const LayoutState&, const Box&, UsedVerticalValues, UsedHorizontalValues);
93 static LayoutUnit shrinkToFitWidth(LayoutState&, const Box&, UsedHorizontalValues);
94
95 static Edges computedBorder(const Box&);
96 static Optional<Edges> computedPadding(const Box&, UsedHorizontalValues);
97
98 static ComputedHorizontalMargin computedHorizontalMargin(const Box&, UsedHorizontalValues);
99 static ComputedVerticalMargin computedVerticalMargin(const Box&, UsedHorizontalValues);
100
101 static Optional<LayoutUnit> computedValueIfNotAuto(const Length& geometryProperty, LayoutUnit containingBlockWidth);
102 static Optional<LayoutUnit> fixedValue(const Length& geometryProperty);
103
104 static Optional<LayoutUnit> computedMinHeight(const LayoutState&, const Box&);
105 static Optional<LayoutUnit> computedMaxHeight(const LayoutState&, const Box&);
106
107 static FormattingContext::IntrinsicWidthConstraints constrainByMinMaxWidth(const Box&, IntrinsicWidthConstraints);
108
109 protected:
110 enum class HeightType { Min, Max, Normal };
111 static Optional<LayoutUnit> computedHeightValue(const LayoutState&, const Box&, HeightType);
112
113 private:
114 static VerticalGeometry outOfFlowReplacedVerticalGeometry(const LayoutState&, const Box&, UsedVerticalValues);
115 static HorizontalGeometry outOfFlowReplacedHorizontalGeometry(const LayoutState&, const Box&, UsedHorizontalValues);
116
117 static VerticalGeometry outOfFlowNonReplacedVerticalGeometry(const LayoutState&, const Box&, UsedVerticalValues);
118 static HorizontalGeometry outOfFlowNonReplacedHorizontalGeometry(LayoutState&, const Box&, UsedHorizontalValues);
119
120 static HeightAndMargin floatingReplacedHeightAndMargin(const LayoutState&, const Box&, UsedVerticalValues);
121 static WidthAndMargin floatingReplacedWidthAndMargin(const LayoutState&, const Box&, UsedHorizontalValues);
122
123 static WidthAndMargin floatingNonReplacedWidthAndMargin(LayoutState&, const Box&, UsedHorizontalValues);
124 };
125
126 class Quirks {
127 public:
128 static LayoutUnit heightValueOfNearestContainingBlockWithFixedHeight(const LayoutState&, const Box&);
129 };
130
131private:
132 void computeOutOfFlowVerticalGeometry(const Box&) const;
133 void computeOutOfFlowHorizontalGeometry(const Box&) const;
134
135 WeakPtr<const Box> m_root;
136 FormattingState& m_formattingState;
137};
138
139}
140}
141#endif
142