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 | |
35 | namespace WebCore { |
36 | |
37 | class ContainerNode; |
38 | class Document; |
39 | class Element; |
40 | class Node; |
41 | class RenderStyle; |
42 | class Text; |
43 | |
44 | class RenderTreeUpdater { |
45 | public: |
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 | |
54 | private: |
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 (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 | |