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 "FormattingContext.h"
32#include "InlineFormattingState.h"
33#include "InlineRun.h"
34#include <wtf/IsoMalloc.h>
35
36namespace WebCore {
37namespace Layout {
38
39class FloatingState;
40class InlineContainer;
41class InlineRunProvider;
42class Line;
43
44// This class implements the layout logic for inline formatting contexts.
45// https://www.w3.org/TR/CSS22/visuren.html#inline-formatting
46class InlineFormattingContext : public FormattingContext {
47 WTF_MAKE_ISO_ALLOCATED(InlineFormattingContext);
48public:
49 InlineFormattingContext(const Box& formattingContextRoot, InlineFormattingState&);
50 void layout() const override;
51
52private:
53 void computeIntrinsicWidthConstraints() const override;
54
55 class LineLayout {
56 public:
57 LineLayout(const InlineFormattingContext&);
58 void layout(const InlineRunProvider&) const;
59
60 private:
61 enum class IsLastLine { No, Yes };
62 void initializeNewLine(Line&) const;
63 void closeLine(Line&, IsLastLine) const;
64 void appendContentToLine(Line&, const InlineRunProvider::Run&, const LayoutSize&) const;
65 void postProcessInlineRuns(Line&, IsLastLine) const;
66 void createFinalRuns(Line&) const;
67 void splitInlineRunIfNeeded(const InlineRun&, InlineRuns& splitRuns) const;
68 void computeFloatPosition(const FloatingContext&, Line&, const Box&) const;
69 void placeInFlowPositionedChildren(unsigned firstRunIndex) const;
70 void alignRuns(TextAlignMode, Line&, IsLastLine) const;
71 void computeExpansionOpportunities(Line&, const InlineRunProvider::Run&, InlineRunProvider::Run::Type lastRunType) const;
72 LayoutUnit runWidth(const InlineContent&, const InlineItem&, ItemPosition from, unsigned length, LayoutUnit contentLogicalLeft) const;
73
74 private:
75 static void justifyRuns(Line&);
76
77 private:
78 const InlineFormattingContext& m_formattingContext;
79 InlineFormattingState& m_formattingState;
80 FloatingState& m_floatingState;
81 const Container& m_formattingRoot;
82 };
83
84 class Geometry : public FormattingContext::Geometry {
85 public:
86 static HeightAndMargin inlineBlockHeightAndMargin(const LayoutState&, const Box&);
87 static WidthAndMargin inlineBlockWidthAndMargin(LayoutState&, const Box&, UsedHorizontalValues);
88 };
89
90 void layoutFormattingContextRoot(const Box&, UsedHorizontalValues) const;
91 void computeIntrinsicWidthForFloatBox(const Box&) const;
92 void computeIntrinsicWidthForInlineBlock(const Box&) const;
93 void computeWidthAndHeightForReplacedInlineBox(const Box&, UsedHorizontalValues) const;
94 void computeMargin(const Box&, UsedHorizontalValues) const;
95 void computeHeightAndMargin(const Box&) const;
96 void computeWidthAndMargin(const Box&, UsedHorizontalValues) const;
97
98 void collectInlineContent(InlineRunProvider&) const;
99
100 InlineFormattingState& formattingState() const { return downcast<InlineFormattingState>(FormattingContext::formattingState()); }
101};
102
103}
104}
105#endif
106