1 | /* |
2 | * Copyright (C) 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 | #include "config.h" |
27 | #include "RenderTreeUpdaterGeneratedContent.h" |
28 | |
29 | #include "ContentData.h" |
30 | #include "InspectorInstrumentation.h" |
31 | #include "PseudoElement.h" |
32 | #include "RenderDescendantIterator.h" |
33 | #include "RenderElement.h" |
34 | #include "RenderImage.h" |
35 | #include "RenderQuote.h" |
36 | #include "RenderTreeUpdater.h" |
37 | #include "StyleTreeResolver.h" |
38 | |
39 | namespace WebCore { |
40 | |
41 | RenderTreeUpdater::GeneratedContent::GeneratedContent(RenderTreeUpdater& updater) |
42 | : m_updater(updater) |
43 | { |
44 | } |
45 | |
46 | void RenderTreeUpdater::GeneratedContent::updateRemainingQuotes() |
47 | { |
48 | if (!m_updater.renderView().hasQuotesNeedingUpdate()) |
49 | return; |
50 | updateQuotesUpTo(nullptr); |
51 | m_previousUpdatedQuote = nullptr; |
52 | m_updater.renderView().setHasQuotesNeedingUpdate(false); |
53 | } |
54 | |
55 | void RenderTreeUpdater::GeneratedContent::updateQuotesUpTo(RenderQuote* lastQuote) |
56 | { |
57 | auto quoteRenderers = descendantsOfType<RenderQuote>(m_updater.renderView()); |
58 | auto it = m_previousUpdatedQuote ? ++quoteRenderers.at(*m_previousUpdatedQuote) : quoteRenderers.begin(); |
59 | auto end = quoteRenderers.end(); |
60 | for (; it != end; ++it) { |
61 | auto& quote = *it; |
62 | // Quote character depends on quote depth so we chain the updates. |
63 | quote.updateRenderer(m_updater.m_builder, m_previousUpdatedQuote.get()); |
64 | m_previousUpdatedQuote = makeWeakPtr(quote); |
65 | if ("e == lastQuote) |
66 | return; |
67 | } |
68 | ASSERT(!lastQuote); |
69 | } |
70 | |
71 | static void createContentRenderers(RenderTreeBuilder& builder, RenderElement& pseudoRenderer, const RenderStyle& style) |
72 | { |
73 | ASSERT(style.contentData()); |
74 | |
75 | for (const ContentData* content = style.contentData(); content; content = content->next()) { |
76 | auto child = content->createContentRenderer(pseudoRenderer.document(), style); |
77 | if (pseudoRenderer.isChildAllowed(*child, style)) |
78 | builder.attach(pseudoRenderer, WTFMove(child)); |
79 | } |
80 | } |
81 | |
82 | static void updateStyleForContentRenderers(RenderElement& pseudoRenderer, const RenderStyle& style) |
83 | { |
84 | for (auto& contentRenderer : descendantsOfType<RenderElement>(pseudoRenderer)) { |
85 | // We only manage the style for the generated content which must be images or text. |
86 | if (!is<RenderImage>(contentRenderer) && !is<RenderQuote>(contentRenderer)) |
87 | continue; |
88 | contentRenderer.setStyle(RenderStyle::createStyleInheritingFromPseudoStyle(style)); |
89 | } |
90 | } |
91 | |
92 | void RenderTreeUpdater::GeneratedContent::updatePseudoElement(Element& current, const Optional<Style::ElementUpdate>& update, PseudoId pseudoId) |
93 | { |
94 | PseudoElement* pseudoElement = pseudoId == PseudoId::Before ? current.beforePseudoElement() : current.afterPseudoElement(); |
95 | |
96 | if (auto* renderer = pseudoElement ? pseudoElement->renderer() : nullptr) |
97 | m_updater.renderTreePosition().invalidateNextSibling(*renderer); |
98 | |
99 | if (!needsPseudoElement(update)) { |
100 | if (pseudoElement) { |
101 | if (pseudoId == PseudoId::Before) |
102 | removeBeforePseudoElement(current, m_updater.m_builder); |
103 | else |
104 | removeAfterPseudoElement(current, m_updater.m_builder); |
105 | } |
106 | return; |
107 | } |
108 | |
109 | RefPtr<PseudoElement> newPseudoElement; |
110 | if (!pseudoElement) { |
111 | newPseudoElement = PseudoElement::create(current, pseudoId); |
112 | pseudoElement = newPseudoElement.get(); |
113 | } |
114 | |
115 | if (update->change == Style::NoChange) |
116 | return; |
117 | |
118 | if (newPseudoElement) { |
119 | if (pseudoId == PseudoId::Before) |
120 | current.setBeforePseudoElement(newPseudoElement.releaseNonNull()); |
121 | else |
122 | current.setAfterPseudoElement(newPseudoElement.releaseNonNull()); |
123 | } |
124 | |
125 | if (update->style->display() == DisplayType::Contents) { |
126 | // For display:contents we create an inline wrapper that inherits its |
127 | // style from the display:contents style. |
128 | auto contentsStyle = RenderStyle::createPtr(); |
129 | contentsStyle->setStyleType(pseudoId); |
130 | contentsStyle->inheritFrom(*update->style); |
131 | contentsStyle->copyContentFrom(*update->style); |
132 | |
133 | Style::ElementUpdate contentsUpdate { WTFMove(contentsStyle), update->change, update->recompositeLayer }; |
134 | m_updater.updateElementRenderer(*pseudoElement, contentsUpdate); |
135 | pseudoElement->storeDisplayContentsStyle(RenderStyle::clonePtr(*update->style)); |
136 | } else { |
137 | m_updater.updateElementRenderer(*pseudoElement, *update); |
138 | ASSERT(!pseudoElement->hasDisplayContents()); |
139 | } |
140 | |
141 | auto* pseudoElementRenderer = pseudoElement->renderer(); |
142 | if (!pseudoElementRenderer) |
143 | return; |
144 | |
145 | if (update->change == Style::Detach) |
146 | createContentRenderers(m_updater.m_builder, *pseudoElementRenderer, *update->style); |
147 | else |
148 | updateStyleForContentRenderers(*pseudoElementRenderer, *update->style); |
149 | |
150 | if (m_updater.renderView().hasQuotesNeedingUpdate()) { |
151 | for (auto& child : descendantsOfType<RenderQuote>(*pseudoElementRenderer)) |
152 | updateQuotesUpTo(&child); |
153 | } |
154 | m_updater.m_builder.updateAfterDescendants(*pseudoElementRenderer); |
155 | } |
156 | |
157 | bool RenderTreeUpdater::GeneratedContent::needsPseudoElement(const Optional<Style::ElementUpdate>& update) |
158 | { |
159 | if (!update) |
160 | return false; |
161 | if (!m_updater.renderTreePosition().parent().canHaveGeneratedChildren()) |
162 | return false; |
163 | if (!pseudoElementRendererIsNeeded(update->style.get())) |
164 | return false; |
165 | return true; |
166 | } |
167 | |
168 | void RenderTreeUpdater::GeneratedContent::removeBeforePseudoElement(Element& element, RenderTreeBuilder& builder) |
169 | { |
170 | auto* pseudoElement = element.beforePseudoElement(); |
171 | if (!pseudoElement) |
172 | return; |
173 | tearDownRenderers(*pseudoElement, TeardownType::Full, builder); |
174 | element.clearBeforePseudoElement(); |
175 | } |
176 | |
177 | void RenderTreeUpdater::GeneratedContent::removeAfterPseudoElement(Element& element, RenderTreeBuilder& builder) |
178 | { |
179 | auto* pseudoElement = element.afterPseudoElement(); |
180 | if (!pseudoElement) |
181 | return; |
182 | tearDownRenderers(*pseudoElement, TeardownType::Full, builder); |
183 | element.clearAfterPseudoElement(); |
184 | } |
185 | |
186 | } |
187 | |