1/*
2 * Copyright (C) 2016-2017 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#include "RenderTreeBuilder.h"
29#include "RenderTreePosition.h"
30#include "StyleChange.h"
31#include "StyleUpdate.h"
32#include <wtf/HashSet.h>
33#include <wtf/Vector.h>
34
35namespace WebCore {
36
37class ContainerNode;
38class Document;
39class Element;
40class Node;
41class RenderStyle;
42class Text;
43
44class RenderTreeUpdater {
45public:
46 RenderTreeUpdater(Document&);
47 ~RenderTreeUpdater();
48
49 void commit(std::unique_ptr<const Style::Update>);
50
51 static void tearDownRenderers(Element&);
52 static void tearDownRenderer(Text&);
53
54private:
55 class GeneratedContent;
56
57 void updateRenderTree(ContainerNode& root);
58 void updateTextRenderer(Text&, const Style::TextUpdate*);
59 void createTextRenderer(Text&, const Style::TextUpdate*);
60 void updateElementRenderer(Element&, const Style::ElementUpdate&);
61 void updateRendererStyle(RenderElement&, RenderStyle&&, StyleDifference);
62 void createRenderer(Element&, RenderStyle&&);
63 void updateBeforeDescendants(Element&, const Style::ElementUpdates*);
64 void updateAfterDescendants(Element&, const Style::ElementUpdates*);
65 bool textRendererIsNeeded(const Text& textNode);
66 void storePreviousRenderer(Node&);
67
68 struct Parent {
69 Element* element { nullptr };
70 const Style::ElementUpdates* updates { nullptr };
71 Optional<RenderTreePosition> renderTreePosition;
72
73 bool didCreateOrDestroyChildRenderer { false };
74 RenderObject* previousChildRenderer { nullptr };
75
76 Parent(ContainerNode& root);
77 Parent(Element&, const Style::ElementUpdates*);
78 };
79 Parent& parent() { return m_parentStack.last(); }
80 Parent& renderingParent();
81 RenderTreePosition& renderTreePosition();
82
83 GeneratedContent& generatedContent() { return *m_generatedContent; }
84
85 void pushParent(Element&, const Style::ElementUpdates*);
86 void popParent();
87 void popParentsToDepth(unsigned depth);
88
89 enum class TeardownType { Full, RendererUpdate, RendererUpdateCancelingAnimations };
90 static void tearDownRenderers(Element&, TeardownType, RenderTreeBuilder&);
91 static void tearDownTextRenderer(Text&, RenderTreeBuilder&);
92 static void tearDownLeftoverShadowHostChildren(Element&, RenderTreeBuilder&);
93 static void tearDownLeftoverPaginationRenderersIfNeeded(Element&, RenderTreeBuilder&);
94
95 RenderView& renderView();
96
97 Document& m_document;
98 std::unique_ptr<const Style::Update> m_styleUpdate;
99
100 Vector<Parent> m_parentStack;
101
102 std::unique_ptr<GeneratedContent> m_generatedContent;
103
104 RenderTreeBuilder m_builder;
105};
106
107} // namespace WebCore
108