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
39namespace WebCore {
40
41RenderTreeUpdater::GeneratedContent::GeneratedContent(RenderTreeUpdater& updater)
42 : m_updater(updater)
43{
44}
45
46void 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
55void 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 (&quote == lastQuote)
66 return;
67 }
68 ASSERT(!lastQuote);
69}
70
71static 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
82static 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
92void 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
157bool 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
168void 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
177void 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